CN109847394B - System and method for recycling process waste heat of ethylene glycol rectification device - Google Patents
System and method for recycling process waste heat of ethylene glycol rectification device Download PDFInfo
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- CN109847394B CN109847394B CN201910243858.3A CN201910243858A CN109847394B CN 109847394 B CN109847394 B CN 109847394B CN 201910243858 A CN201910243858 A CN 201910243858A CN 109847394 B CN109847394 B CN 109847394B
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- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 title claims abstract description 236
- 238000000034 method Methods 0.000 title claims abstract description 64
- 239000002918 waste heat Substances 0.000 title claims abstract description 27
- 238000004064 recycling Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 238000007670 refining Methods 0.000 claims abstract description 44
- 239000000047 product Substances 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 30
- 239000006227 byproduct Substances 0.000 claims abstract description 12
- 238000011084 recovery Methods 0.000 claims abstract description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 29
- 229920006395 saturated elastomer Polymers 0.000 claims description 29
- 238000001816 cooling Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 description 11
- 239000007788 liquid Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention relates to a device and a method for recycling process waste heat of an ethylene glycol rectification device, wherein a process material at the top of a dealcoholization tower is connected with a tube side of a low-grade steam generator of the dealcoholization tower through a pipeline, and a process material at the top of a refining tower of an ethylene glycol product is connected with the tube side of the low-grade steam generator of the dealcoholization tower through a pipeline; the shell passes of the low-grade steam generator of the dealcoholization tower and the low-grade steam generator of the ethylene glycol product refining tower are communicated with a boiler water or steam condensate system through pipelines, and the low-grade byproduct low-grade steam of the low-grade steam generator of the dealcoholization tower and the low-grade steam generator of the ethylene glycol product refining tower is divided into two paths after being gathered and respectively connected with the shell pass of a reboiler of the dealcoholization tower and the tube pass of a low-grade steam superheater. The waste heat of the process materials at the top of the dealcoholization tower and the product refining tower in the ethylene glycol rectification device is used for by-producing low-grade steam, so that the heat recovery and utilization are realized.
Description
Technical Field
The invention relates to a system and a method for recycling process waste heat of an ethylene glycol rectification device, in particular to a method for recycling a byproduct low-grade saturated steam of process material waste heat at the top of an aldehyde removing tower and a product refining tower in the ethylene glycol rectification device.
Background
The material temperature of the top of the dealcoholization tower and the product refining tower in the ethylene glycol rectification device is up to 130-144 ℃, water coolers are respectively arranged at the top of the dealcoholization tower and the product refining tower in the current ethylene glycol rectification device, and the high-temperature material is cooled by circulating water, so that a large amount of circulating water is consumed, and the waste heat loss of the material in the process is not fully recycled; the byproduct low-grade saturated steam of 115-122 ℃ of the existing chemical process device is basically cooled by a water cooler to recover steam condensate or used for heating steam, and the partial heat energy is not fully utilized; at present, the reboiler of the methanol removing tower is heated by 0.5MPaG steam, and a large amount of factory steam is consumed; at present, the ethylene glycol device and the pipeline heat tracing adopt 0.5MPaG steam as heat tracing steam. Along with the gradual maturity of ethylene glycol technology, the scale of production facility is also bigger and bigger, needs to fully carry out recycle with this partial technology material waste heat.
Disclosure of Invention
In view of the defects of the prior art, according to the process characteristics of the ethylene glycol rectification device, the system and the method for recycling the process waste heat of the ethylene glycol rectification device are provided, the process material waste heat of a dealcoholization tower and a product refining tower top in the ethylene glycol rectification device is used for producing low-grade saturated steam as a byproduct, the low-grade saturated steam is firstly used for heating steam of a reboiler of a dealcoholization tower, the redundant low-grade steam is used for continuously driving a steam turbine set to operate, and a steam turbine drags operating equipment. Steam condensate generated by a process waste heat recovery and utilization system of the ethylene glycol rectification device is used as heat tracing hot water of equipment and pipelines.
The technical scheme adopted by the invention is as follows:
a system for recycling process waste heat of an ethylene glycol rectification device is characterized in that process materials at the top of a dealcoholization tower in the ethylene glycol rectification device are connected with a tube pass of a low-grade steam generator at the top of the dealcoholization tower through a pipeline, and process materials at the top of an ethylene glycol product refining tower in the ethylene glycol rectification device are connected with the tube pass of the low-grade steam generator at the top of the ethylene glycol product refining tower through a pipeline; the shell pass by-products of the low-grade saturated steam of the low-grade steam generator of the dealcoholization tower and the low-grade saturated steam of the low-grade steam generator of the ethylene glycol product refining tower are collected and divided into two paths to be respectively connected with the shell pass of a reboiler of the methanol removal tower and the tube pass of a low-grade steam superheater, and the tube pass of the low-grade steam superheater is also connected with a steam turbine through a pipeline.
Preferably, the heat exchange tubes of the low-grade steam generator of the dealcoholization tower and the low-grade steam generator of the ethylene glycol product refining tower adopt high-flux sintered tubes with better heat exchange efficiency.
Preferably, the shell sides of the low-grade steam generator of the dealcoholization tower and the low-grade steam generator of the glycol product refining tower are communicated with a boiler water or steam condensate system through pipelines.
Preferably, a shell pass inlet of the low-grade steam superheater is communicated with a heating steam pipeline, a shell pass outlet of the low-grade steam superheater is communicated with the steam flash tank through a pipeline, and a top outlet of the steam flash tank is communicated with a 0.5MPa steam pipe network through a pipeline.
Preferably, the steam turbine is communicated with a condensed water cooler through a pipeline, and a pipe pass of the condensed water cooler and the cooling tower form a circulation loop through a circulating water pump and the pipeline.
Further preferably, the shell process of the condensed water cooler is communicated with a condensed water pump through a pipeline, and the condensed water pump is communicated with the device heat tracing hot water pipe network through a pipeline.
Preferably, an outlet of a shell pass of the reboiler of the methanol removing tower is communicated with a steam condensate tank through a pipeline, and an outlet at the bottom of the steam condensate tank is communicated with a heat tracing hot water pipe network of the device through a condensate pump and a pipeline.
Preferably, the steam turbine is connected with operation equipment through a coupling, the steam turbine is a condensing steam turbine, one or more sets of steam turbines connected in parallel are arranged, and the operation equipment comprises a generator or a compressor or a pump or a fan.
Preferably, a low-grade steam temperature regulating valve is arranged on the heating steam pipeline, a dealcoholization tower low-grade steam generator liquid level regulating valve is arranged between the boiler water or steam condensate system and the dealcoholization tower low-grade steam generator, and an ethylene glycol product refining tower low-grade steam generator liquid level regulating valve is arranged between the boiler water or steam condensate system and the refining tower low-grade steam generator in the ethylene glycol rectifying device.
The method for recycling the waste heat of the ethylene glycol rectification device by adopting any one device comprises the following steps:
1) introducing process materials at the top of a dealcoholization tower in an ethylene glycol rectification device into a tube side of a low-grade steam generator of the dealcoholization tower, introducing process materials at the top of an ethylene glycol product refining tower into a tube side of a low-grade steam generator of a product refining tower, and heating boiler water or steam condensate to obtain a byproduct low-grade steam;
2) the low-grade saturated steam in the step 1) is firstly used for heating a reboiler of a methanol removing tower in the ethylene glycol rectification device, and redundant low-grade saturated steam enters a low-grade steam superheater and is used for driving a steam turbine to operate after being superheated by hot steam;
and the recovery and utilization of the process waste heat of the ethylene glycol rectification device are completed.
Preferably, the temperatures of the process material at the top of the dealcoholization tower and the process material at the top of the ethylene glycol product refining tower in the ethylene glycol rectification device in the step 1) are 130-144 ℃, and the low-grade saturated steam byproduct in the step 1) is: 115 ℃ and 122 ℃.
Preferably, the temperature of the low-grade saturated steam entering the low-grade steam superheater and superheated by the hot steam in the step 2) is more than 170 ℃.
Preferably, the heating steam of step 2) is the saturated or superheated steam of the 1.5-3.8MPaG grade which is redundant in the factory.
The invention has the following beneficial effects:
1. the dealcoholization tower low-grade steam generator and the product refining tower low-grade steam generator are adopted to replace a traditional dealcoholization tower top water cooler and a product refining tower top water cooler, and the problem that process waste heat is not recycled and a large amount of circulating water is consumed when process materials at the top of a dealcoholization tower and a product refining tower in an ethylene glycol rectification device are cooled by adopting circulating water as a cooling medium in the prior art is solved, and the circulating water exchanges heat with the process materials at 130-144 ℃, so that the side structure and the blockage of the circulating water are easily caused.
2. The low-grade saturated steam generated by the low-grade steam generator of the dealcoholization tower and the low-grade saturated steam generated by the low-grade steam generator of the product refining tower are used for replacing the heating steam of the reboiler of the dealcoholization tower of 0.5MPaG, so that the energy consumption of the ethylene glycol rectification device can be reduced, and the risk of over-temperature and over-pressure of the dealcoholization tower caused by improper operation when the heating steam of 0.5MPaG is adopted can be effectively prevented.
3. The byproduct low-grade steam of the low-grade steam generator of the dealcoholization tower and the low-grade steam generator of the product refining tower is used for driving a steam turbine, the steam turbine can drag running equipment such as a generator, a compressor, a fan, a pump and the like, and if the generator is dragged, the economic benefit of the device can be increased; if the running equipment such as a compressor, a fan, a pump and the like is selected to be dragged, a large amount of electric energy can be saved.
4. The invention improves the integrity of the ethylene glycol rectification device process and the advancement of the technology, and improves the environment-friendly, energy-saving and water-saving level of the ethylene glycol rectification process.
5. Because the steam turbine has special requirements on the degree of superheat of the driving steam, the condensing steam turbine with higher efficiency is selected, the low-grade saturated steam is superheated by adopting the low-grade steam superheater to meet the requirement of the steam turbine on the degree of superheat of the steam, and potential safety hazards brought by the low-grade saturated steam to the operation of the steam turbine are eliminated.
6. Steam condensate coming out of the shell pass of the methanol removing tower reboiler and condensate coming out of a steam turbine condensate system are used as device heat tracing water after being boosted by a pump, so that 0.5MPa heat tracing steam is saved, and the energy consumption of the device is reduced. The condensate after heat tracing can be used as boiler reuse water after being sent to a condensate recovery system for treatment, thereby achieving the purposes of recycling the condensate, saving water and energy.
7. After the heating steam is superheated with low-grade saturated steam, the low-grade saturated steam is flashed out by a steam flash drum and is sent to a 0.5MPa steam pipe network of a factory to be sent out of an ethylene glycol rectification device.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: a dealcoholization tower low-grade steam generator 1; a low-grade steam generator 2 of the ethylene glycol product refining tower; a demethanizer reboiler 3; a low-grade steam superheater 4; a steam turbine 5; a running device 6; a condensed water cooler 7; a cooling tower 8; a circulating water pump 9; a condensate pump 10; a low-grade steam temperature regulating valve 11 and a liquid level regulating valve 12 of a low-grade steam generator of the dealcoholization tower; a liquid level regulating valve 13 of a low-grade steam generator of the ethylene glycol product refining tower; a dealcoholization column 14; a refining column 15; a demethanizer 16; a heating steam line 17; a coupling 18, a boiler water or steam condensate system 19; a steam flash tank 20; a vapor condensate tank 21; a vapor condensate pump 22.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited to the scope of the examples. These examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.
Example 1
Fig. 1 is a schematic structural diagram of the device.
A system for recycling process waste heat of an ethylene glycol rectification device is characterized in that process materials at the top of a dealcoholization tower 14 in the ethylene glycol rectification device are connected with a tube pass of a dealcoholization tower low-grade steam generator 1 through a pipeline, and process materials at the top of a refining tower 15 in the ethylene glycol rectification device are connected with a tube pass of a ethylene glycol product refining tower low-grade steam generator 2 through a pipeline; the shell pass by-products of the low-grade steam generator 1 of the dealcoholization tower and the low-grade steam generator 2 of the ethylene glycol product refining tower are divided into two paths after being gathered and are respectively connected with the shell pass of the demethanizing tower reboiler 3 and the tube pass of the low-grade steam superheater 4, and the tube pass of the low-grade steam superheater 4 is also connected with a steam turbine 5 through a pipeline.
Preferably, the heat exchange tubes of the low-grade steam generator 1 of the dealcoholization tower and the low-grade steam generator 2 of the ethylene glycol product refining tower adopt high-flux sintered tubes with better heat exchange efficiency.
Preferably, the shell sides of the dealcoholization tower low-grade steam generator 1 and the ethylene glycol product refining tower low-grade steam generator 2 are communicated with a boiler water or steam condensate system 19 through pipes.
Preferably, a shell pass inlet of the low-grade steam superheater 4 is communicated with a heating steam pipeline 17, a shell pass outlet of the low-grade steam superheater is communicated with a steam flash tank 20 through a pipeline, and a top outlet of the steam flash tank is communicated with a 0.5MPa steam pipe network through a pipeline.
Preferably, the steam turbine 5 is communicated with a condensed water cooler 7 through a pipeline, and the pipe side of the condensed water cooler 7 and a cooling tower 8 form a circulating loop through the pipeline through a circulating water pump 9.
Further preferably, the shell pass of the condensate water cooler 7 is communicated with a condensate pump 10 through a pipeline, and the condensate pump 10 is communicated with a device heat tracing hot water pipe network through a pipeline.
Preferably, the shell pass outlet of the demethanizer reboiler 3 is communicated with a vapor condensate tank 21 through a pipeline, and the bottom outlet of the vapor condensate tank 21 is communicated with a device heat tracing hot water pipe network through a condensate pump 22 and a pipeline.
Preferably, the steam turbine 5 is connected with the operating equipment 6 through a coupling 18, the steam turbine is a condensing steam turbine, one or more sets of parallel steam turbines are arranged, and the operating equipment comprises a generator or a compressor or a pump or a fan.
Preferably, a low-grade steam temperature regulating valve 11 is arranged on the heating steam pipeline 17, a dealcoholization tower low-grade steam generator liquid level regulating valve 12 is arranged between the boiler water or steam condensate system 19 and the dealcoholization tower low-grade steam generator 1, and an ethylene glycol product refining tower low-grade steam generator liquid level regulating valve 13 is arranged between the boiler water or steam condensate system 19 and the ethylene glycol product refining tower low-grade steam generator 2.
The method for recycling the waste heat of the ethylene glycol rectification device by adopting any one device comprises the following steps:
1) introducing a process material at the top of a dealcoholization tower 14 in an ethylene glycol rectification device into a tube pass of a dealcoholization tower low-grade steam generator 1, introducing a process material at the top of a refining tower 15 in the ethylene glycol rectification device into a tube pass of a product refining tower low-grade steam generator 2, and heating boiler water or steam condensate to obtain a low-grade saturated steam byproduct;
2) the low-grade saturated steam in the step 1 is firstly used for heating a methanol removing tower reboiler 3 in the ethylene glycol rectification device, and redundant low-grade saturated steam enters a low-grade steam superheater 4 to exchange heat with the heating steam and then is used for driving a steam turbine 6 to operate;
and the recovery and utilization of the process waste heat of the ethylene glycol rectification device are completed.
Preferably, the temperatures of the process material at the top of the dealcoholization tower 14 and the process material at the top of the ethylene glycol product refining tower 15 in the ethylene glycol rectification device in the step 1) are 130-144 ℃, and the low-grade saturated steam by-produced in the step 1) is: 115 ℃ and 122 ℃.
Preferably, the temperature of the low-grade steam entering the low-grade steam superheater 4 in the step 2) after heat exchange with the heating steam is more than 170 ℃.
Preferably, the heating steam of step 2) is the saturated or superheated steam of the 1.5-3.8MPaG grade which is redundant in the factory.
As shown in figure 1, in the system for recycling the waste heat of the ethylene glycol rectification process, boiler water or steam condensate (passing through a dealcoholization tower low-grade steam generator 1 and a product refining tower low-grade steam generator 2 at about 100 ℃ to exchange heat with tower top process materials such as a dealcoholization tower and a product refining tower, and the like) is subjected to heat exchange to generate a large amount of low-grade saturated steam at 115-122 ℃, the generated low-grade saturated steam is firstly used as heating steam of a reboiler 3 of the dealcoholization tower, and the redundant low-grade steam is completely used for driving a steam turbine.
In order to ensure the safe and stable operation of the steam turbine, low-grade steam for steam turbine power generation needs to exchange heat with heating steam to more than 170 ℃ through a low-grade steam superheater 4, the low-grade steam meets the requirement of the steam turbine on the degree of superheat of the steam and is sent to a steam turbine set to serve as driving steam, a low-grade steam temperature regulating valve 11 is arranged on a heating steam pipeline, and the temperature of the low-grade steam for driving the steam turbine set can be automatically regulated to meet the requirement of the steam turbine on the degree of superheat of the steam.
The steam turbine 5 is provided with a condensed water recovery system, condensed water discharged by the steam turbine is cooled by a condensed water cooler 7 and then is sent to a heat tracing hot water pipe network by a condensed water pump 10, and the heat tracing water is sent to a condensed water treatment device for treatment and then is recycled as boiler reuse water.
And (3) feeding the steam condensate from the shell pass of the methanol removing tower reboiler 3 into a condensate tank 21, providing condensate for pumping to a heat tracing hot water pipe network, and sending the heat tracing water to a condensate water treatment device for treatment and then recycling as boiler reuse water.
Heating steam from the shell pass of the steam superheater 4 enters a steam flash tank 20, and 0.5MPa steam is flashed out and sent to a 0.5MPa steam pipe network.
Taking a 60 ten thousand ton/year ethylene glycol rectification device as an example, the ratio of the traditional process and the various consumed process parameters adopting the embodiment 1 is as follows:
TABLE 1
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes in shape and structure made by using the contents of the present specification and drawings, or applied directly or indirectly to other related technical fields are included in the scope of the present invention.
Claims (9)
1. A device for recycling process waste heat of an ethylene glycol rectification device is characterized in that: the process material at the top of the dealcoholization tower (14) in the ethylene glycol rectification device is connected with the tube side of the low-grade steam generator (1) of the dealcoholization tower through a pipeline, and the process material at the top of the ethylene glycol product refining tower (15) in the ethylene glycol rectification device is connected with the tube side of the low-grade steam generator (2) of the ethylene glycol product tower through a pipeline; the shell pass by-product low-grade steam of the low-grade steam generator (1) of the dealcoholization tower and the low-grade steam generator (2) of the ethylene glycol product refining tower is collected and divided into two paths which are respectively connected with the shell pass of a demethanization tower reboiler (3) and the tube pass of a low-grade steam superheater (4), and the tube pass of the low-grade steam superheater (4) is also connected with a steam turbine (5) through a pipeline; the tube pass of the methanol removing tower reboiler (3) is connected with the tower kettle of the methanol removing tower (16) in the ethylene glycol rectification device through a pipeline, the shell pass of the methanol removing tower reboiler (3) is connected with the steam condensate tank (21) through a pipeline, and the steam condensate of the steam condensate tank (21) is communicated with a heat tracing hot water pipe network of the device through a steam condensate pump (22) and a pipeline.
2. The apparatus for recovering and utilizing the process waste heat of the ethylene glycol rectification apparatus according to claim 1, characterized in that the shell sides of the low-grade steam generator (1) of the dealcoholization tower and the low-grade steam generator (2) of the ethylene glycol product refining tower are communicated with a boiler water or steam condensate system (19) through a pipeline.
3. The apparatus for recovering and utilizing the process waste heat of the ethylene glycol rectification apparatus according to claim 1, wherein a shell side inlet and an outlet of the low-grade steam superheater (4) are respectively communicated with the heating steam pipeline (17) and the steam flash tank (20).
4. The apparatus for recovering and utilizing the process waste heat of the ethylene glycol rectification apparatus according to claim 1, wherein the steam exhaust port of the steam turbine (5) is communicated with a condensed water cooler (7) through a pipeline, and a circulating loop is formed by the tube pass of the condensed water cooler (7) and a cooling tower (8) through a circulating water pump (9) and the pipeline.
5. The device for recycling the process waste heat of the ethylene glycol rectification device according to claim 4, wherein the shell pass of the condensed water cooler (7) is communicated with the condensed water pump (10) through a pipeline, and the condensed water pump (10) is communicated with a device heat tracing water pipe network through a pipeline.
6. The apparatus for recycling the process waste heat of the ethylene glycol rectification apparatus according to claim 1, wherein the steam turbine (5) is connected with the operation equipment (6) through a coupling (18), the steam turbine (5) is a condensing steam turbine, one or more sets of parallel steam turbines are arranged, and the operation equipment (6) comprises a generator or a compressor or a pump or a fan.
7. The method for recycling the process waste heat of the ethylene glycol rectification device by adopting the device of any one of claims 1 to 6 is characterized by comprising the following steps:
1) introducing process materials at the top of a dealcoholization tower (14) in an ethylene glycol rectification device into a tube pass of a dealcoholization tower low-grade steam generator (1), introducing process materials at the top of a refining tower (15) in the ethylene glycol rectification device into a tube pass of a product refining tower low-grade steam generator (2), heating boiler water or steam condensate, and producing low-grade saturated steam as a byproduct;
2) the low-grade steam in the step 1) is firstly used for heating a methanol removing tower reboiler (3) in the ethylene glycol rectification device, and redundant low-grade saturated steam enters a low-grade steam superheater (4) and is used for driving a steam turbine (6) to operate after being superheated by heating steam;
and the recovery and utilization of the process waste heat of the ethylene glycol rectification device are completed.
8. The method according to claim 7, characterized in that the temperature of the process material at the top of the dealcoholization tower (14) and the process material at the top of the ethylene glycol product refining tower (15) in the ethylene glycol rectification device in the step 1) is 130-144 ℃, and the low-grade saturated steam by-produced in the step 1) is: 115 ℃ and 122 ℃, and the step 2) heating steam is the redundant saturated or superheated steam with the grade of 1.5-3.8MPaG in the factory.
9. The method according to claim 7, characterized in that the temperature of the low-grade saturated steam entering the low-grade steam superheater (4) after heat exchange with the heating steam in the shell pass is more than 170 ℃, and the heating steam from the shell pass of the low-grade steam superheater (4) is flashed to 0.5MPa steam by a steam flash tank (20) and sent to a 0.5MPa steam pipe network.
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| CN110280039A (en) * | 2019-07-30 | 2019-09-27 | 江苏超跃化学有限公司 | A kind of recycle device for the exhaust steam and lime set water that Steam reboiler generates |
| CN113072428B (en) * | 2021-04-16 | 2022-06-07 | 上海交通大学 | Replacement thermal coupling process for vacuum induced air for ethylene glycol rectification separation |
| CN114060789B (en) * | 2021-11-29 | 2023-06-16 | 中国成达工程有限公司 | Method for recovering heat of cumene device |
| CN114543576B (en) * | 2022-01-25 | 2023-08-18 | 中建石化工程有限公司 | A system and method for utilizing waste heat of by-product steam in a coal-to-ethylene glycol plant |
| CN115371028A (en) * | 2022-07-20 | 2022-11-22 | 陕西榆能化学材料有限公司 | A waste heat reuse module and method in an ethylene glycol evaporation system |
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