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CN112344777B - Spiral plate heat exchange system and back washing method thereof - Google Patents

Spiral plate heat exchange system and back washing method thereof Download PDF

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Publication number
CN112344777B
CN112344777B CN201910730640.0A CN201910730640A CN112344777B CN 112344777 B CN112344777 B CN 112344777B CN 201910730640 A CN201910730640 A CN 201910730640A CN 112344777 B CN112344777 B CN 112344777B
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China
Prior art keywords
pipe
plate heat
spiral plate
backwash
heat exchanger
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CN201910730640.0A
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Chinese (zh)
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CN112344777A (en
Inventor
陈章华
魏鑫
李双权
崔玉伟
黄诚
张国信
袁亮
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China Petroleum and Chemical Corp
Sinopec Guangzhou Engineering Co Ltd
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China Petroleum and Chemical Corp
Sinopec Guangzhou Engineering Co Ltd
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Priority to CN201910730640.0A priority Critical patent/CN112344777B/en
Publication of CN112344777A publication Critical patent/CN112344777A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/04—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being formed by spirally-wound plates or laminae
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G15/00—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G15/00—Details
    • F28G15/003—Control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G15/00—Details
    • F28G2015/006—Arrangements for processing a cleaning fluid after use, e.g. filtering and recycling

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention discloses a spiral plate heat exchange system and a back washing method thereof. The spiral plate heat exchange system comprises: the spiral plate heat exchanger is provided with a hot side material inlet and outlet and a cold side material inlet and outlet; the device comprises a first material inlet pipe, a first material outlet pipe, a second material inlet pipe and a second material outlet pipe, wherein the first material inlet pipe is connected with a hot-side material inlet, the first material outlet pipe is connected with a hot-side material outlet, the second material inlet pipe is connected with a cold-side material inlet, and the second material outlet pipe is connected with a cold-side material outlet; the first material outlet pipe is connected with the first material outlet pipe; the first drain pipe is connected with the first material inlet pipe; the first cold-side backwashing pipe and the second cold-side backwashing pipe are both connected with the second material outlet pipe; and a second drain pipe connected to the second material inlet pipe. The spiral plate heat exchange system has the advantages of low operation and maintenance cost, low cleaning difficulty, long service life and the like.

Description

Spiral plate heat exchange system and back washing method thereof
Technical Field
The invention relates to the field of heat exchangers, in particular to a spiral plate heat exchange system and a back washing method of the spiral plate heat exchange system.
Background
Compared with a commonly used shell-and-tube heat exchanger, the spiral plate heat exchanger has the advantages of good heat transfer performance, small possibility of blockage and scaling of a single channel, compact structure and the like. Because of good self-cleaning capability, the spiral plate heat exchanger has a longer continuous operation period, especially under the working conditions of high viscosity and easy coking.
However, after the spiral plate heat exchanger is operated for a certain period, the heat efficiency and related process parameters of the spiral plate heat exchanger cannot meet the requirements of production operation, and the spiral plate heat exchanger needs to be cut out for coke cleaning and descaling. At present, a mechanical cleaning mode is utilized to decoke and descale the spiral plate heat exchanger. However, the mechanical cleaning method is not only expensive, but also difficult to operate and poor in effect due to the relatively small channel gap of the spiral plate heat exchanger, and can only be treated by a high-temperature scorching method in extreme cases, but the method causes great mechanical damage to the equipment.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a spiral plate heat exchange system and a back washing method thereof.
In order to achieve the above object, a first aspect of the present invention provides a spiral plate heat exchange system, comprising: the spiral plate heat exchanger is provided with a hot side material inlet, a hot side material outlet, a cold side material inlet and a cold side material outlet; the device comprises a first material inlet pipe, a first material outlet pipe, a second material inlet pipe and a second material outlet pipe, wherein the first material inlet pipe is connected with the hot side material inlet, the first material outlet pipe is connected with the hot side material outlet, the second material inlet pipe is connected with the cold side material inlet, and the second material outlet pipe is connected with the cold side material outlet; each of the first hot side back washing pipe and the second hot side back washing pipe is connected with the first material outlet pipe; the first sewage discharge pipe is connected with the first material inlet pipe; a first cold-side backwash pipe and a second cold-side backwash pipe, each of the first and second cold-side backwash pipes connected with the second material outlet pipe; and the second sewage discharge pipe is connected with the second material inlet pipe.
The spiral plate heat exchange system provided by the embodiment of the invention has the advantages of low operation and maintenance cost, low cleaning difficulty and long service life.
Preferably, the spiral plate heat exchange system further comprises: the first storage tank is provided with a first heater; and each of the inlet end and the outlet end of the first circulating pipe is connected with the first storage tank, a first circulating pump is arranged on the first circulating pipe, the first hot-side backwashing pipe is connected with the first circulating pipe, preferably, a first switch valve is arranged on the first circulating pipe, a second switch valve is arranged on the first hot-side backwashing pipe, a third switch valve is arranged on the second hot-side backwashing pipe, and a fourth switch valve is arranged on the first sewage draining pipe.
Preferably, the spiral plate heat exchange system further comprises: the second storage tank is provided with a second heater; and each of the inlet end and the outlet end of the second circulating pipe is connected with the second storage tank, a second circulating pump is arranged on the second circulating pipe, the first cold-side backwashing pipe is connected with the second circulating pipe, preferably, a fifth switch valve is arranged on the second circulating pipe, a sixth switch valve is arranged on the first cold-side backwashing pipe, a seventh switch valve is arranged on the second cold-side backwashing pipe, and an eighth switch valve is arranged on the second sewage draining pipe.
Preferably, a ninth switch valve is arranged on the first material inlet pipe, a tenth switch valve is arranged on the first material outlet pipe, an eleventh switch valve is arranged on the second material inlet pipe, and a twelfth switch valve is arranged on the second material outlet pipe, wherein the first sewage discharge pipe is connected with the part of the first material inlet pipe, which is located between the ninth switch valve and the hot-side material inlet, each of the first hot-side backwashing pipe and the second hot-side backwashing pipe is connected with the part of the first material outlet pipe, which is located between the tenth switch valve and the hot-side material outlet, the second sewage discharge pipe is connected with the part of the second material inlet pipe, which is located between the eleventh switch valve and the cold-side material inlet, and each of the first cold-side backwashing pipe and the second cold-side backwashing pipe is connected with the part of the second material, which is located between the twelfth switch valve and the cold-side material outlet.
In a second aspect of the invention, a back flushing method of a spiral plate heat exchange system according to the first aspect of the invention is provided, which comprises the following steps: when the pressure drop of the hot side of the spiral plate heat exchanger is larger than or equal to a first preset value or when the difference between the temperature of the medium at the hot side material inlet and the temperature of the medium at the hot side material outlet is smaller than or equal to a second preset value, stopping the operation of the spiral plate heat exchanger; conveying a first back flushing fluid with a first preset temperature to the spiral plate heat exchanger through a first hot side back flushing pipe, and conveying a second back flushing fluid with a second preset temperature to the spiral plate heat exchanger through a second hot side back flushing pipe, wherein the first preset temperature is higher than the second preset temperature; when the pressure drop of the cold side of the spiral plate heat exchanger is larger than or equal to a third preset value or when the difference value between the temperature of the medium at the cold side material outlet and the temperature of the medium at the cold side material inlet is smaller than or equal to a fourth preset value, stopping the operation of the spiral plate heat exchanger; and firstly conveying a third backwash liquid with a third preset temperature to the spiral plate heat exchanger through the first cold-side backwash pipe, and then conveying a fourth backwash liquid with a fourth preset temperature to the spiral plate heat exchanger through the second cold-side backwash pipe, wherein the third preset temperature is higher than the fourth preset temperature.
Preferably, the flow rate of the first backwash liquid is 5% -25% of the flow rate of the hot side medium of the spiral plate heat exchanger, preferably, the flow rate of the first backwash liquid is 7% -15% of the flow rate of the hot side medium of the spiral plate heat exchanger, and more preferably, the flow rate of the first backwash liquid is 7% -10% of the flow rate of the hot side medium of the spiral plate heat exchanger; the flow rate of the second backwash liquid is 5% -25% of the flow rate of the medium at the hot side of the spiral plate heat exchanger, preferably, the flow rate of the second backwash liquid is 8% -15% of the flow rate of the medium at the hot side of the spiral plate heat exchanger, and more preferably, the flow rate of the second backwash liquid is 8% -10% of the flow rate of the medium at the hot side of the spiral plate heat exchanger; the flow rate of the third backwash liquid is 5% -30% of the flow rate of the cold side medium of the spiral plate heat exchanger, preferably the flow rate of the third backwash liquid is 10% -20% of the flow rate of the cold side medium of the spiral plate heat exchanger, and more preferably the flow rate of the third backwash liquid is 14% -18% of the flow rate of the cold side medium of the spiral plate heat exchanger; the flow rate of the fourth backwash liquid is 8% -40% of the flow rate of the cold side medium of the spiral plate heat exchanger, preferably, the flow rate of the fourth backwash liquid is 10% -30% of the flow rate of the cold side medium of the spiral plate heat exchanger, and more preferably, the flow rate of the fourth backwash liquid is 16% -20% of the flow rate of the cold side medium of the spiral plate heat exchanger.
Preferably, the first preset temperature is 180-260 ℃, preferably, the first preset temperature is 200-240 ℃, and more preferably, the first preset temperature is 220 ℃; the second preset temperature is 30-70 ℃, preferably, the second preset temperature is 40-60 ℃, and more preferably, the second preset temperature is 50 ℃; the third preset temperature is 120-200 ℃, preferably the third preset temperature is 140-180 ℃, and more preferably the third preset temperature is 160 ℃; the fourth preset temperature is 30-70 ℃, preferably, the fourth preset temperature is 40-60 ℃, and more preferably, the fourth preset temperature is 50 ℃.
Preferably, when the first back washing liquid is used for back washing, when the temperature at the hot-side material inlet reaches the first preset temperature, the first back washing liquid is used for back washing for a first preset time, and then the back washing by the first back washing liquid is stopped; when the second backwash liquid is used for backwashing, when the temperature at the hot-side material inlet reaches the second preset temperature, the second backwash liquid is used for backwashing for a second preset time, and then the second backwash liquid is stopped for backwashing; when the third back flushing liquid is used for back flushing, when the temperature at the cold side material inlet reaches the third preset temperature, the third back flushing liquid is used for back flushing for a third preset time, and then the back flushing by using the third back flushing liquid is stopped; when the fourth back flushing liquid is used for back flushing, when the temperature at the cold side material inlet reaches the fourth preset temperature, the fourth back flushing liquid is used for back flushing for a fourth preset time, and then the back flushing by the fourth back flushing liquid is stopped; preferably, the first preset time is 0.5 to 2 hours, the second preset time is 2 to 6 hours, the third preset time is 0.5 to 2 hours, and the fourth preset time is 2 to 6 hours.
Preferably, each of the first backwash and the third backwash is heavy wax oil and each of the second backwash and the fourth backwash is catalytic cycle oil.
Preferably, the first preset value is 3-6 times of the initial pressure drop of the hot side of the spiral plate heat exchanger, the third preset value is 3-6 times of the initial pressure drop of the cold side of the spiral plate heat exchanger, the difference between the initial temperature difference of the hot side of the spiral plate heat exchanger and the second preset value is greater than or equal to 20 ℃ and less than or equal to 40 ℃, and the difference between the initial temperature difference of the cold side of the spiral plate heat exchanger and the fourth preset value is greater than or equal to 20 ℃ and less than or equal to 40 ℃.
Drawings
FIG. 1 is a schematic view of a partial configuration of a spiral plate heat exchange system according to an embodiment of the present invention;
fig. 2 is a partial structural schematic diagram of a spiral plate heat exchange system according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
A spiral plate heat exchange system 1 according to an embodiment of the present invention will be described with reference to the accompanying drawings. As shown in fig. 1 and 2, a spiral plate heat exchange system 1 according to an embodiment of the present invention includes a spiral plate heat exchanger 10, a first material inlet pipe 210, a first material outlet pipe 220, a second material inlet pipe 230, a second material outlet pipe 240, a first hot side backwash pipe 310, a second hot side backwash pipe 320, a first blowdown pipe 330, a first cold side backwash pipe 410, a second cold side backwash pipe 420, and a second blowdown pipe 430.
The spiral plate heat exchanger 10 has a hot side material inlet, a hot side material outlet, a cold side material inlet, and a cold side material outlet. The first material inlet pipe 210 is connected to the hot side material inlet, the first material outlet pipe 220 is connected to the hot side material outlet, the second material inlet pipe 230 is connected to the cold side material inlet, and the second material outlet pipe 240 is connected to the cold side material outlet. Each of the first and second hot side backwash pipes 310 and 320 is connected to the first material outlet pipe 220, and the first drain pipe 330 is connected to the first material inlet pipe 210. Each of the first and second cold- side backwash pipes 410 and 420 is connected to the second material outlet pipe 240, and the second blowdown pipe 430 is connected to the second material inlet pipe 230.
A back flushing method of the spiral plate heat exchange system 1 according to an embodiment of the present invention will be described with reference to fig. 1 and 2. The back washing method of the spiral plate heat exchange system 1 provided by the embodiment of the invention comprises the following steps:
when the pressure drop of the hot side of the spiral plate heat exchanger 10 is greater than or equal to a first preset value or when the difference between the temperature of the medium at the hot side material inlet and the temperature of the medium at the hot side material outlet is less than or equal to a second preset value, the operation of the spiral plate heat exchanger 10 is stopped. The pressure drop at the hot side of the spiral plate heat exchanger 10 is: the difference between the pressure of the medium at the hot side material inlet and the pressure of the medium at the hot side material outlet. The difference between the temperature of the medium at the hot side material inlet and the temperature of the medium at the hot side material outlet is the difference between the temperature of the medium entering the hot side and the temperature of the medium leaving the hot side.
First, a first backwash liquid with a first preset temperature is conveyed to the spiral plate heat exchanger 10 through the first hot-side backwash pipe 310, and then a second backwash liquid with a second preset temperature is conveyed to the spiral plate heat exchanger 10 through the second hot-side backwash pipe 320, wherein the first preset temperature is higher than the second preset temperature.
Since both the first and second hot side backwash pipes 310 and 320 are connected to the first material outlet pipe 220, both the first and second backwash liquids can flow in the hot side of the spiral plate heat exchanger 10. Wherein the first backwash liquid displaces the original medium unconverted residue in the hot side and the second backwash liquid dissolves the original medium unconverted residue that has not been displaced. The first backwash liquid and the second backwash liquid are discharged through the first drain pipe 330.
When the pressure drop of the cold side of the spiral plate heat exchanger 10 is greater than or equal to a third preset value or when the difference between the temperature of the medium at the cold side material outlet and the temperature of the medium at the cold side material inlet is less than or equal to a fourth preset value, the operation of the spiral plate heat exchanger 10 is stopped. Wherein the pressure drop at the cold side of the spiral plate heat exchanger 10 is: the difference between the pressure of the medium at the cold side material inlet and the pressure of the medium at the cold side material outlet. The difference between the temperature of the medium at the cold side material outlet and the temperature of the medium at the cold side material inlet is the difference between the temperature of the medium leaving the cold side and the temperature of the medium entering the cold side.
A third backwash liquid having a third predetermined temperature is first supplied to the spiral plate heat exchanger 10 through the first cold-side backwash pipe 410, and a fourth backwash liquid having a fourth predetermined temperature is then supplied to the spiral plate heat exchanger 10 through the second cold-side backwash pipe 420, wherein the third predetermined temperature is higher than the fourth predetermined temperature.
Since both the first and second cold- side backwash pipes 410, 420 are connected to the second material outlet pipe 240, both the third and fourth backwash liquids can flow in the cold side of the spiral plate heat exchanger 10. Wherein the third backwash displaces the raw medium vacuum residue in the cold side and the fourth backwash dissolves the raw medium vacuum residue which is not displaced. The third backwash liquid and the fourth backwash liquid are discharged through the second drainage pipe 430.
The spiral plate heat exchange system 1 according to the embodiment of the present invention can back flush the spiral plate heat exchanger 10 with a back flush fluid by providing the first and second hot side back flush pipes 310 and 320 connected to the first material outlet pipe 220 and the first and second cold side back flush pipes 410 and 420 connected to the second material outlet pipe 240.
From this not only need not to carry out the dismouting to spiral plate heat exchanger 10 to greatly reduced spiral plate heat exchanger 10's operation maintenance cost need not to carry out mechanical cleaning and high temperature scorch to spiral plate heat exchanger 10 moreover, so that reduce spiral plate heat exchanger 10's washing expense and washing degree of difficulty, avoid causing mechanical damage to spiral plate heat exchanger 10.
Therefore, the spiral plate heat exchange system 1 provided by the embodiment of the invention has the advantages of low operation and maintenance cost, low cleaning difficulty, long service life and the like.
By using the back washing method according to the embodiment of the invention, the operation and maintenance cost, the cleaning cost and the cleaning difficulty of the spiral plate heat exchanger 10 can be reduced, and the mechanical damage to the spiral plate heat exchanger 10 can be avoided.
As shown in fig. 1 and 2, in some embodiments of the present invention, the spiral plate heat exchange system 1 may include a spiral plate heat exchanger 10, a first material inlet pipe 210, a first material outlet pipe 220, a second material inlet pipe 230, a second material outlet pipe 240, a first hot side backwash pipe 310, a second hot side backwash pipe 320, a first blowdown pipe 330, a first cold side backwash pipe 410, a second cold side backwash pipe 420, a second blowdown pipe 430, a first storage tank 510, a first circulation pipe 520, a second storage tank 530, and a second circulation pipe 540.
The spiral plate heat exchanger 10 has a hot side material inlet, a hot side material outlet, a cold side material inlet, and a cold side material outlet. The first material inlet pipe 210 is connected to the hot side material inlet, the first material outlet pipe 220 is connected to the hot side material outlet, the second material inlet pipe 230 is connected to the cold side material inlet, and the second material outlet pipe 240 is connected to the cold side material outlet.
As shown in fig. 1, the first hot-side backwash pipe 310 is connected to the first material outlet pipe 220, and the second hot-side backwash pipe 320 is connected to the first hot-side backwash pipe 310, that is, the second hot-side backwash pipe 320 is connected to the first material outlet pipe 220 through the first hot-side backwash pipe 310. The first hot-side backwash pipe 310 is provided with a second on-off valve 620, and the second hot-side backwash pipe 320 is provided with a third on-off valve 630. When the hot side of the spiral plate heat exchanger 10 is backwashed with the first backwash liquid, the second on-off valve 620 is opened and the third on-off valve 630 is closed; when the hot side of the spiral plate heat exchanger 10 is backwashed with the second backwash liquid, the third on-off valve 630 is opened and the second on-off valve 620 is closed.
The first storage tank 510 is provided with a first heater, each of an inlet end and an outlet end of the first circulation pipe 520 is connected to the first storage tank 510, and the first circulation pump 810 is provided on the first circulation pipe 520. The first backwash liquid may be stored in the first tank 510 and the first heater may heat the first backwash liquid to bring the temperature of the first backwash liquid to and maintain the temperature of the first backwash liquid at the first predetermined temperature. Wherein the first hot side backwash pipe 310 is connected to the first circulation pipe 520 so that the first backwash liquid enters the first hot side backwash pipe 310 through the first circulation pipe 520.
As shown in fig. 2, the first cold-side backwash pipe 410 is connected to the second material outlet pipe 240, and the second cold-side backwash pipe 420 is connected to the first cold-side backwash pipe 410, that is, the second cold-side backwash pipe 420 is connected to the second material outlet pipe 240 through the first cold-side backwash pipe 410. Wherein, a sixth switch valve 660 is arranged on the first cold-side backwashing pipe 410, and a seventh switch valve 670 is arranged on the second cold-side backwashing pipe 420. When the cold side of the spiral plate heat exchanger 10 is backwashed with the third backwash liquid, the sixth switching valve 660 is opened and the seventh switching valve 670 is closed; when the cold side of the spiral plate heat exchanger 10 is back flushed with this fourth backwash liquid, the seventh switching valve 670 is opened and the sixth switching valve 660 is closed.
The second storage tank 530 is provided with a second heater, each of the inlet and outlet ends of the second circulation pipe 540 is connected to the second storage tank 530, and the second circulation pipe 540 is provided with a second circulation pump 820. The third backwash liquid may be stored in a second tank 530 and the second heater may heat the third backwash liquid to reach and maintain the temperature of the third backwash liquid at the third predetermined temperature. Wherein the first cold-side backwash pipe 410 is connected to the second circulation pipe 540 so that the third backwash liquid enters the first cold-side backwash pipe 410 through the second circulation pipe 540.
The first soil discharge pipe 330 is connected to the first material inlet pipe 210, and the second soil discharge pipe 430 is connected to the second material inlet pipe 230. Wherein, the first sewage pipe 330 is provided with a fourth switch valve 640, and the second sewage pipe 430 is provided with an eighth switch valve 680.
As shown in fig. 1 and fig. 2, in an embodiment of the present invention, a ninth switch valve 710 is disposed on the first material inlet pipe 210, a tenth switch valve 720 is disposed on the first material outlet pipe 220, an eleventh switch valve 730 is disposed on the second material inlet pipe 230, and a twelfth switch valve 740 is disposed on the second material outlet pipe 240. The first drain pipe 330 is connected to a portion of the first material inlet pipe 210 between the ninth on-off valve 710 and the hot-side material inlet, that is, a connection point between the first drain pipe 330 and the first material inlet pipe 210 is located between the ninth on-off valve 710 and the hot-side material inlet.
The first hot side reverse flushing pipe 310 is connected to a portion of the first material outlet pipe 220 between the tenth switching valve 720 and the hot side material outlet, that is, a connection of the first hot side reverse flushing pipe 310 and the first material outlet pipe 220 is between the tenth switching valve 720 and the hot side material outlet. If the second hot side backwash pipe 320 is directly connected to the first material outlet pipe 220, the second hot side backwash pipe 320 is connected to a portion of the first material outlet pipe 220 between the tenth switching valve 720 and the hot side material outlet.
The second soil discharge pipe 430 is connected to a portion of the second material inlet pipe 230 between the eleventh switching valve 730 and the cold-side material inlet, i.e., the connection of the second soil discharge pipe 430 and the second material inlet pipe 230 is between the eleventh switching valve 730 and the cold-side material inlet. The first cold-side backwash pipe 410 is connected to the portion of the second material outlet pipe 240 between the twelfth switch valve 740 and the cold-side material outlet, i.e. the connection of the first cold-side backwash pipe 410 and the second material outlet pipe 240 is located between the twelfth switch valve 740 and the cold-side material outlet. If second cold-side backwash pipe 420 is connected directly to second material outlet pipe 240, second cold-side backwash pipe 420 is connected to the part of second material outlet pipe 240 between twelfth switching valve 740 and the cold-side material outlet.
Preferably, the first circulation pipe 520 is provided with a first switching valve 610, and the second circulation pipe 540 is provided with a fifth switching valve 650.
When the pressure drop of the hot side of the spiral plate heat exchanger 10 is greater than or equal to 3-6 times of the initial pressure drop of the hot side, the operation of the spiral plate heat exchanger 10 is stopped, that is, the first preset value is 3-6 times of the initial pressure drop of the hot side. The initial pressure drop of the hot side is the pressure drop of the hot side when the spiral plate heat exchanger 10 is used for the first time (calculated according to the medium, flow, temperature, heat exchange area, and the like of the spiral plate heat exchanger 10). Preferably, the first preset value is 4 times the initial pressure drop at the hot side of the spiral plate heat exchanger 10.
When the difference between the initial temperature difference of the hot side of the spiral plate heat exchanger 10 and the second preset value is greater than or equal to 20 ℃ and less than or equal to 40 ℃, the operation of the spiral plate heat exchanger 10 is stopped. For example, when the difference between the temperature of the medium at the hot-side material inlet and the temperature of the medium at the hot-side material outlet is less than or equal to the initial temperature difference of the hot side minus 30 ℃, the operation of the spiral plate heat exchanger 10 is stopped. Wherein the initial temperature difference of the hot side is: when the spiral plate heat exchanger 10 is used for the first time, the difference between the temperature of the medium at the hot-side material inlet and the temperature of the medium at the hot-side material outlet is obtained.
Before the hot side of the spiral plate heat exchanger 10 is backwashed, the tenth switching valve 720 is closed, and then the ninth switching valve 710 is closed. The first backwash liquid having the first preset temperature is then delivered to the spiral plate heat exchanger 10 through the first hot side backwash pipe 310 (the second on-off valve 620 is opened and the third on-off valve 630 is closed). The first backwash liquid may be a heavy wax oil. The first preset temperature is 180-260 ℃. Preferably, the first preset temperature is 200 ℃ to 240 ℃. More preferably, the first preset temperature is 220 ℃. Thereby, the replacement effect of the first backwash liquid can be improved, and more crude medium residual oil can be replaced.
The flow rate of the first backwash liquid is 5% -25% of the flow rate of the medium at the hot side of the spiral plate heat exchanger 10. The flow of hot side material is: the spiral plate heat exchanger 10 is operated with a flow of hot side medium flowing through the spiral plate heat exchanger 10. Preferably, the flow rate of the first backwash liquid is 7% -15% of the flow rate of the hot side medium of the spiral plate heat exchanger 10. More preferably, the flow rate of the first backwash liquid is 7-10% of the flow rate of the hot side medium of the spiral plate heat exchanger 10. This makes it possible to reduce the amount of the first backwash liquid to be used while ensuring the backwash effect (replacement effect).
When the first backwash liquid is used for backwashing, when the temperature at the hot-side material inlet reaches the first preset temperature (which indicates that the hot side of the spiral plate heat exchanger 10 is full of the first backwash liquid), the first backwash liquid is used for backwashing for a first preset time, and then the backwashing by the first backwash liquid is stopped, namely the first backwash liquid is stopped being conveyed to the hot side of the spiral plate heat exchanger 10. It is further ensured thereby that the crude medium residue in the hot side is adequately replaced by the first backwash liquid.
Wherein the first preset time is 0.5-2 hours. Preferably, the first preset time is 1 hour. This makes it possible to reduce the backwashing time while ensuring the backwashing effect (displacement effect) and to improve the backwashing efficiency of the spiral plate heat exchanger 10.
Subsequently, the second backwash liquid having the second preset temperature is supplied to the spiral plate heat exchanger 10 through the second hot-side backwash pipe 320 (the third on-off valve 630 is opened and the second on-off valve 620 is closed). The second backwash may be catalytic cycle oil. The second predetermined temperature is 30 ℃ to 70 ℃. Preferably, the second preset temperature is 40 ℃ to 60 ℃. More preferably, the second preset temperature is 50 ℃. The dissolving effect of the second backwash liquid can thereby be increased, so that more of the virgin medium residue which has not been replaced can be dissolved. Wherein the first backwash liquid and the second backwash liquid are discharged through the first drain pipe 330.
The flow rate of the second backwash liquid is 5% -25% of the flow rate of the medium at the hot side of the spiral plate heat exchanger 10. Preferably, the flow rate of the second backwash liquid is 8% -15% of the flow rate of the hot side medium of the spiral plate heat exchanger 10. More preferably, the flow rate of the second backwash liquid is 8% -10% of the flow rate of the hot side medium of the spiral plate heat exchanger 10. This makes it possible to reduce the amount of the second backwash liquid to be used while ensuring the backwash effect (dissolution effect).
When the second backwash liquid is used for backwashing, when the temperature at the hot-side material inlet reaches the second preset temperature (which indicates that the hot side of the spiral plate heat exchanger 10 is full of the second backwash liquid), the second backwash liquid is used for backwashing for a second preset time, and then the backwashing by using the second backwash liquid is stopped, namely the second backwash liquid is stopped being conveyed to the hot side of the spiral plate heat exchanger 10. It can further be ensured that the crude oil residue in the hot side is sufficiently dissolved by the second backwash liquid.
Wherein the second preset time is 2-6 hours. Preferably, the second predetermined time is 4 hours. This makes it possible to reduce the backwashing time while ensuring the backwashing effect (dissolution effect) and to improve the backwashing efficiency of the spiral plate heat exchanger 10.
When the pressure drop of the cold side of the spiral plate heat exchanger 10 is greater than or equal to 3-6 times of the initial pressure drop of the cold side, the operation of the spiral plate heat exchanger 10 is stopped, i.e. the third preset value is 3-6 times of the initial pressure drop of the cold side. Wherein the initial pressure drop at the cold side is the pressure drop at the cold side when the spiral plate heat exchanger 10 is used for the first time (calculated according to the medium, flow, temperature, heat exchange area, etc. of the spiral plate heat exchanger 10). Preferably, this third preset value is 4 times the initial pressure drop at the cold side of the spiral plate heat exchanger 10.
When the difference between the initial temperature difference of the cold side of the spiral plate heat exchanger 10 and the fourth preset value is greater than or equal to 20 ℃ and less than or equal to 40 ℃, the operation of the spiral plate heat exchanger 10 is stopped. For example, when the difference between the temperature of the medium at the cold side material outlet and the temperature of the medium at the cold side material inlet is less than or equal to the initial temperature difference of the cold side minus 30 ℃, the operation of the spiral plate heat exchanger 10 is stopped. Wherein the initial temperature difference on the cold side is: the difference between the temperature of the medium at the cold side material outlet and the temperature of the medium at the cold side material inlet when the spiral plate heat exchanger 10 is used for the first time.
Before the cold side of the spiral plate heat exchanger 10 is backwashed, the twelfth on-off valve 740 is closed, and then the eleventh on-off valve 730 is closed. This third backwash liquid having the third preset temperature is then fed through the first cold-side backwash pipe 410 to the spiral plate heat exchanger 10 (sixth switching valve 660 is opened and seventh switching valve 670 is closed). The third backwash may be a heavy wax oil. The third predetermined temperature is 120 ℃ to 200 ℃. Preferably, the third predetermined temperature is 140 ℃ to 180 ℃. More preferably, the third preset temperature is 160 ℃. The displacement effect of the third backwash liquid can thereby be increased, so that more crude medium residue can be displaced.
The flow of the third backwash liquid is 5-30% of the flow of the cold side medium of the spiral plate heat exchanger 10. The flow rate of the materials on the cold side refers to that: the flow of material through the cold side of the spiral plate heat exchanger 10 when the spiral plate heat exchanger 10 is in operation. Preferably, the flow rate of the third backwash liquid is 10-20% of the flow rate of the cold side medium of the spiral plate heat exchanger 10. More preferably, the flow of the third backwash liquid is 14-18% of the flow of the cold side medium of the spiral plate heat exchanger 10. This makes it possible to reduce the amount of the third backwash liquid to be used while ensuring the backwash effect (replacement effect).
During the back flushing with the third back flushing fluid, when the temperature at the cold side material inlet reaches the third predetermined temperature (which indicates that the cold side of the spiral plate heat exchanger 10 is filled with the third back flushing fluid), the back flushing with the third back flushing fluid is performed for a third predetermined time, and then the back flushing with the third back flushing fluid is stopped, that is, the supply of the third back flushing fluid to the cold side of the spiral plate heat exchanger 10 is stopped. It can thereby be further ensured that the crude residue in the cold side is sufficiently displaced by the third backwash liquid.
Wherein the third preset time is 0.5-2 hours. Preferably, the third predetermined time is 1 hour. This makes it possible to reduce the backwashing time while ensuring the backwashing effect (displacement effect) and to improve the backwashing efficiency of the spiral plate heat exchanger 10.
Subsequently, this fourth backwash liquid with this fourth preset temperature is conveyed to the spiral plate heat exchanger 10 through the second cold-side backwash pipe 420 (second switching valve 620 is opened and third switching valve 630 is closed). The fourth backwash may be catalytic cycle oil. The fourth preset temperature is 30-70 ℃. Preferably, the fourth preset temperature is 40 ℃ to 60 ℃. More preferably, the fourth preset temperature is 50 ℃. The dissolving effect of the fourth backwash liquid can thereby be increased, so that more of the virgin medium residue which has not been replaced can be dissolved. Wherein the third backwash liquid and the fourth backwash liquid are discharged through the second drain pipe 430.
The flow rate of the fourth backwash liquid is 8% -40% of the flow rate of the cold-side medium of the spiral plate heat exchanger 10. Preferably, the flow rate of the fourth backwash liquid is 10-30% of the flow rate of the cold side medium of the spiral plate heat exchanger 10. More preferably, the flow of the fourth backwash liquid is 16-20% of the flow of the cold side medium of the spiral plate heat exchanger 10. This makes it possible to reduce the amount of the fourth backwash liquid to be used while ensuring the backwash effect (dissolution effect).
During the back flushing with the fourth back flushing fluid, when the temperature at the cold side material inlet reaches the fourth predetermined temperature (which indicates that the cold side of the spiral plate heat exchanger 10 is filled with the second back flushing fluid), the back flushing with the fourth back flushing fluid is performed for a fourth predetermined time, and then the back flushing with the fourth back flushing fluid is stopped, that is, the fourth back flushing fluid is stopped being conveyed to the cold side of the spiral plate heat exchanger 10. It can thus be further ensured that the crude residue in the cold side is sufficiently dissolved by the fourth backwash liquid.
Wherein the fourth preset time is 2-6 hours. Preferably, the fourth predetermined time is 4 hours. This makes it possible to reduce the backwashing time while ensuring the backwashing effect (dissolution effect) and to improve the backwashing efficiency of the spiral plate heat exchanger 10.
The back flushing of the hot and cold sides of the spiral plate heat exchanger 10 can be performed simultaneously. It is also possible to backwash the hot side of the spiral plate heat exchanger 10 first and then the cold side of the spiral plate heat exchanger 10.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (13)

1. A spiral plate heat exchange system (1), comprising:
the spiral plate heat exchanger (10), the spiral plate heat exchanger (10) has hot side supplies import, hot side supplies export, cold side supplies import and cold side supplies export;
a first material inlet pipe (210), a first material outlet pipe (220), a second material inlet pipe (230) and a second material outlet pipe (240), wherein the first material inlet pipe (210) is connected with the hot-side material inlet, the first material outlet pipe (220) is connected with the hot-side material outlet, the second material inlet pipe (230) is connected with the cold-side material inlet, and the second material outlet pipe (240) is connected with the cold-side material outlet;
a first hot side backwash pipe (310) and a second hot side backwash pipe (320), each of the first hot side backwash pipe (310) and the second hot side backwash pipe (320) connected to the first material outlet pipe (220);
the first drain pipe (330), the first drain pipe (330) is connected with the first material inlet pipe (210);
a first cold-side backwash pipe (410) and a second cold-side backwash pipe (420), each of the first cold-side backwash pipe (410) and the second cold-side backwash pipe (420) being connected to the second material outlet pipe (240); and
a second sewage discharge pipe (430), wherein the second sewage discharge pipe (430) is connected with the second material inlet pipe (230),
the first back flushing liquid introduced from the first hot side back flushing pipe (310) is discharged through the hot side of the spiral plate heat exchanger (10) and the first sewage discharge pipe (330) in sequence; the second back flushing liquid introduced by the second hot side back flushing pipe (320) is discharged through the hot side of the spiral plate heat exchanger (10) and the first sewage discharge pipe (330) in sequence; the third backwash liquid introduced from the first cold-side backwash pipe (410) is discharged through the cold side of the spiral plate heat exchanger (10) and the second drainage pipe (430) in sequence; and a fourth backwash liquid introduced from the second cold-side backwash pipe (420) sequentially passes through the cold side of the spiral plate heat exchanger (10) and is discharged from the second sewage discharge pipe (430), wherein each of the first backwash liquid and the third backwash liquid is heavy wax oil, and each of the second backwash liquid and the fourth backwash liquid is catalytic cycle oil.
2. A spiral plate heat exchange system (1) according to claim 1, further comprising:
a first tank (510), the first tank (510) being provided with a first heater; and
a first circulation pipe (520), each of an inlet end and an outlet end of the first circulation pipe (520) being connected to the first storage tank (510), a first circulation pump (810) being provided on the first circulation pipe (520), wherein the first hot side backwash pipe (310) is connected to the first circulation pipe (520).
3. A spiral plate heat exchange system (1) according to claim 1, further comprising:
a second storage tank (530), the second storage tank (530) being provided with a second heater; and
a second circulation pipe (540), each of an inlet end and an outlet end of the second circulation pipe (540) being connected to the second storage tank (530), a second circulation pump (820) being provided on the second circulation pipe (540), wherein the first cold-side backwash pipe (410) is connected to the second circulation pipe (540).
4. Spiral plate heat exchange system (1) according to claim 1, wherein a ninth on/off valve (710) is provided on the first material inlet pipe (210), a tenth on/off valve (720) is provided on the first material outlet pipe (220), an eleventh on/off valve (730) is provided on the second material inlet pipe (230), and a twelfth on/off valve (740) is provided on the second material outlet pipe (240), wherein each of the first blowdown pipe (330) and the first material inlet pipe (210) is connected to a portion of the first material outlet pipe (220) between the ninth on/off valve (710) and the hot side material inlet, each of the first hot side backwash pipe (310) and the second hot side backwash pipe (320) is connected to a portion of the first material outlet pipe (220) between the tenth on/off valve (720) and the hot side material outlet, the second blowdown pipe (430) is connected to a portion of the second material inlet pipe (230) between the eleventh on/off valve (730) and the material inlet, and the first blowdown pipe (410) is connected to a portion of the second material inlet pipe (240) between the second material inlet pipe (420) and each of the twelfth on/off valve (740).
5. A method of backwashing a spiral plate heat exchange system (1) according to any one of claims 1 to 4, comprising the steps of:
when the pressure drop of the hot side of the spiral plate heat exchanger (10) is larger than or equal to a first preset value or when the difference between the temperature of the medium at the hot side material inlet and the temperature of the medium at the hot side material outlet is smaller than or equal to a second preset value, stopping the operation of the spiral plate heat exchanger (10);
firstly, conveying a first backwash liquid with a first preset temperature to the spiral plate heat exchanger (10) through a first hot-side backwash pipe (310), and then conveying a second backwash liquid with a second preset temperature to the spiral plate heat exchanger (10) through a second hot-side backwash pipe (320), wherein the first preset temperature is higher than the second preset temperature;
when the pressure drop of the cold side of the spiral plate heat exchanger (10) is larger than or equal to a third preset value or when the difference value between the temperature of the medium at the cold side material outlet and the temperature of the medium at the cold side material inlet is smaller than or equal to a fourth preset value, stopping the operation of the spiral plate heat exchanger (10);
a third backwash liquid with a third preset temperature is firstly conveyed to the spiral plate heat exchanger (10) through the first cold-side backwash pipe (410), and then a fourth backwash liquid with a fourth preset temperature is conveyed to the spiral plate heat exchanger (10) through the second cold-side backwash pipe (420), wherein the third preset temperature is higher than the fourth preset temperature.
6. A back-flushing method of a spiral plate heat exchange system (1) according to claim 5, characterized in that the flow rate of the first back-flushing liquid is 5% -25% of the flow rate of the medium at the hot side of the spiral plate heat exchanger (10); the flow rate of the second backwash liquid is 5% -25% of the flow rate of the medium at the hot side of the spiral plate heat exchanger (10); the flow rate of the third backwash liquid is 5% -30% of the flow rate of a cold-side medium of the spiral plate heat exchanger (10); the flow rate of the fourth backwash liquid is 8% -40% of the flow rate of the cold-side medium of the spiral plate heat exchanger (10).
7. A back flushing method of a spiral plate heat exchange system (1) according to claim 6,
the flow rate of the first backwash liquid is 7% -15% of the flow rate of a medium at the hot side of the spiral plate heat exchanger (10); the flow rate of the second backwash liquid is 8% -15% of the flow rate of a medium at the hot side of the spiral plate heat exchanger (10); the flow rate of the third backwash liquid is 10% -20% of the flow rate of a cold-side medium of the spiral plate heat exchanger (10); the flow rate of the fourth backwash liquid is 10% -30% of the flow rate of a cold-side medium of the spiral plate heat exchanger (10).
8. A back flushing method of a spiral plate heat exchange system (1) according to claim 7,
the flow rate of the first backwash liquid is 7% -10% of the flow rate of a medium at the hot side of the spiral plate heat exchanger (10); the flow rate of the second backwash liquid is 8% -10% of the flow rate of a medium at the hot side of the spiral plate heat exchanger (10); the flow rate of the third backwash liquid is 14% -18% of the flow rate of a cold-side medium of the spiral plate heat exchanger (10); the flow rate of the fourth backwash liquid is 16% -20% of the flow rate of the cold side medium of the spiral plate heat exchanger (10).
9. A back-flushing method of a spiral plate heat exchange system (1) according to claim 5, wherein the first preset temperature is 180-260 ℃; the second preset temperature is 30-70 ℃; the third preset temperature is 120-200 ℃; the fourth preset temperature is 30-70 ℃.
10. A method of back-flushing a spiral plate heat exchange system (1) according to claim 9, wherein the first preset temperature is 200-240 ℃; the second preset temperature is 40-60 ℃; the third preset temperature is 140-180 ℃; the fourth preset temperature is 40-60 ℃.
11. A back-flushing method of a spiral plate heat exchange system (1) according to claim 10, wherein the first preset temperature is 220 ℃; the second preset temperature is 50 ℃; the third preset temperature is 160 ℃; the fourth preset temperature is 50 ℃.
12. A back-flushing method of a spiral plate heat exchange system (1) according to claim 5,
when the first backwash liquid is used for backwashing, when the temperature at the hot-side material inlet reaches the first preset temperature, the first backwash liquid is used for backwashing for a first preset time, and then the first backwash liquid is stopped for backwashing;
when the second back washing liquid is used for back washing, when the temperature at the hot-side material inlet reaches the second preset temperature, the second back washing liquid is used for back washing for a second preset time, and then the back washing by the second back washing liquid is stopped;
when the third back flushing liquid is used for back flushing, when the temperature at the cold side material inlet reaches the third preset temperature, the third back flushing liquid is used for back flushing for a third preset time, and then the back flushing by the third back flushing liquid is stopped;
when the fourth back flushing liquid is used for back flushing, when the temperature at the cold side material inlet reaches the fourth preset temperature, the fourth back flushing liquid is used for back flushing for a fourth preset time, and then the back flushing by the fourth back flushing liquid is stopped;
the first preset time is 0.5-2 hours, the second preset time is 2-6 hours, the third preset time is 0.5-2 hours, and the fourth preset time is 2-6 hours.
13. A back-flushing method of a spiral plate heat exchange system (1) according to any one of claims 5 to 12, characterized in that the first preset value is 3 to 6 times the initial pressure drop of the hot side of the spiral plate heat exchanger (10), the third preset value is 3 to 6 times the initial pressure drop of the cold side of the spiral plate heat exchanger (10), the difference between the initial temperature difference of the hot side of the spiral plate heat exchanger (10) and the second preset value is greater than or equal to 20 ℃ and less than or equal to 40 ℃, and the difference between the initial temperature difference of the cold side of the spiral plate heat exchanger (10) and the fourth preset value is greater than or equal to 20 ℃ and less than or equal to 40 ℃.
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