CN111691933B - Mid-exhaust steam extraction water spray heating system and method - Google Patents
Mid-exhaust steam extraction water spray heating system and method Download PDFInfo
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- CN111691933B CN111691933B CN202010620745.3A CN202010620745A CN111691933B CN 111691933 B CN111691933 B CN 111691933B CN 202010620745 A CN202010620745 A CN 202010620745A CN 111691933 B CN111691933 B CN 111691933B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 126
- 238000000605 extraction Methods 0.000 title claims abstract description 64
- 238000010438 heat treatment Methods 0.000 title claims abstract description 46
- 239000007921 spray Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005507 spraying Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000000284 extract Substances 0.000 abstract 1
- 230000002209 hydrophobic effect Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 239000008400 supply water Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/008—Details related to central heating radiators
-
- 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
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Degasification And Air Bubble Elimination (AREA)
Abstract
本发明涉及火电机组技术领域，尤其涉及一种中排抽汽喷水供热系统，包括中压缸、低压缸、除氧器、减温器和换热器，中压缸的排汽口连接低压缸的进汽口，减温器的进汽口和进水口分别连接中压缸的排汽口和除氧器的出口，减温器的出口连接换热器的热端进口，换热器的热端出口连接除氧器的进口，换热器的冷端进口和冷端出口分别连接热网回水管和热网供水管。还涉及一种中排抽汽喷水供热方法，抽取中压缸排汽口排出的蒸汽，并将抽取的蒸汽与除氧器出口排出的给水在减温器内混合，使抽取的蒸汽温度降低，再将减温器内混合后的蒸汽送入换热器内与热网回水换热。能够提高供热量和经济性。
The present invention relates to the technical field of thermal power units, and in particular to a mid-exhaust steam extraction water spray heating system, comprising a medium-pressure cylinder, a low-pressure cylinder, a deaerator, a desuperheater and a heat exchanger, wherein the steam exhaust port of the medium-pressure cylinder is connected to the steam inlet of the low-pressure cylinder, the steam inlet and the water inlet of the desuperheater are respectively connected to the steam exhaust port of the medium-pressure cylinder and the outlet of the deaerator, the outlet of the desuperheater is connected to the hot end inlet of the heat exchanger, the hot end outlet of the heat exchanger is connected to the inlet of the deaerator, and the cold end inlet and the cold end outlet of the heat exchanger are respectively connected to the return water pipe of the heating network and the water supply pipe of the heating network. It also relates to a mid-exhaust steam extraction water spray heating method, which extracts steam discharged from the steam exhaust port of the medium-pressure cylinder, and mixes the extracted steam with the feed water discharged from the outlet of the deaerator in the desuperheater to reduce the temperature of the extracted steam, and then sends the mixed steam in the desuperheater to the heat exchanger for heat exchange with the return water of the heating network. The heating supply and economy can be improved.
Description
Technical Field
The invention relates to the technical field of thermal power generating units, in particular to a medium-exhaust steam extraction water spray heating system and a medium-exhaust steam extraction water spray heating method.
Background
The thermal power generating unit is used for improving the steam extraction and heating, and the improvement range of the economy of the thermal power generating unit is related to a plurality of factors such as steam extraction parameters, steam extraction quantity, steam extraction positions and the like. On the premise of the same heat supply requirement, selecting the steam extraction scheme with the greatest economy suitable for the unit is the key point of researching the thermodynamic system.
Urban heating pipelines generally adopt liquid water as a heating medium, and the water temperature is below 150 ℃. The extraction parameters of the thermal power generating unit are higher than the parameters required by the heating pipeline, and the thermal power generating unit cannot be directly used for heating, so that a heating station is generally required to be arranged to connect the extraction pipeline with the heating pipeline. The high-temperature high-pressure steam in the steam extraction pipeline exchanges heat with the backwater of the heating pipeline in the heating station, and the backwater is conveyed to a heat supply network user for use after being heated, so that heating is realized. The heat supply of this steam extraction heat supply mode is limited by the maximum steam extraction that can be tolerated by the heat supply steam pipeline (i.e., the steam extraction pipeline). Under the condition that the caliber of the heat supply steam pipeline is fixed, the maximum steam extraction amount of the heat supply steam pipeline is limited by the steam flow rate. The heating capacity is thus limited by the steam flow rate. Therefore, only the medium-pressure cylinder exhaust steam is extracted to supply heat or a low-temperature water-reducing heat supply unit is used, and the defect of insufficient heat supply capability of the system exists.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a medium-exhaust steam extraction water spray heating system and a medium-exhaust steam extraction water spray heating method, which can improve heat supply quantity and economy so as to overcome the defects in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
The utility model provides a well arranges steam extraction water spray heating system, including middling pressure jar, low pressure jar, deaerator, desuperheater and heat exchanger, the steam inlet of low pressure jar is connected to the steam inlet of middling pressure jar, and the steam inlet and the water inlet of desuperheater are connected respectively the export of middling pressure jar's steam outlet and deaerator, and the hot junction import of heat exchanger is connected to the export of desuperheater, and the import of deaerator is connected to the hot junction export of heat exchanger, and the cold junction import and the cold junction export of heat exchanger are connected heat supply network wet return and heat supply pipe respectively.
Preferably, the outlet of the deaerator is connected with the water inlet of the desuperheater through a water feed pump.
Preferably, the outlet of the feed water pump is connected to the inlet of the desuperheater by a regulating valve.
Preferably, the hot end outlet of the heat exchanger is connected with the inlet of the deaerator through a hydrophobic pump.
Preferably, the heat supply network water return pipe is connected with the cold end inlet of the heat exchanger through a heat supply network water circulating pump.
A heat supply method for extracting steam from middle-pressure cylinder includes such steps as extracting steam from the steam outlet of middle-pressure cylinder, mixing the extracted steam with the water supply from deaerator to lower the temp of extracted steam, and delivering the mixed steam to heat exchanger for heat exchange with heat network.
Compared with the prior art, the invention has obvious progress:
Compared with the prior art, the medium-pressure exhaust steam is directly sent to a heat exchange device through a heat supply steam pipeline to exchange heat with the heat supply network backwater, the method firstly mixes the extracted medium-pressure cylinder exhaust steam with the water supply discharged from the deaerator outlet in the desuperheater to form heat supply steam with the temperature lower than the medium-pressure exhaust steam temperature, and then sends the heat supply steam into the heat exchanger through the heat supply steam pipeline to exchange heat with the heat supply network backwater to heat the heat supply network backwater, and the water supply discharged from the deaerator outlet is used for reducing the temperature of the medium-pressure exhaust steam, so that the heat supply steam temperature in the heat supply steam pipeline is reduced, the steam flow rate of unit heat supply quantity is reduced, the maximum steam extraction quantity is improved, the heat supply quantity of the heat exchanger can be increased, namely the heat supply quantity of a heat supply network user is increased, the heat supply capacity of a system is improved, the equipment working parameters are reduced, the economic investment of equipment construction is reduced, on the other hand, the water supply steam self temperature discharged from the deaerator outlet is higher than the water supply water outlet temperature discharged from the heat supply network user water outlet to exchange heat supply network backwater to heat the heat supply network backwater, the water is correspondingly increased, the water supply steam is taken as the heat source of the deaerator outlet is used for heating the deaerator, the heat supply steam is jointly used as the heat supply network, the heat supply steam is discharged from the deaerator outlet and the heat supply steam is discharged from the heat supply heat, the heat supply steam is jointly used as the heat supply network, the heat supply device, the heat supply steam is reduced, and the heat supply steam is used for the heat supply network is economical, and the heat and can be increased, and the efficiency and the heat and can be used.
Drawings
Fig. 1 is a simplified schematic diagram of a medium-exhaust steam extraction water spray heating system according to an embodiment of the present invention.
Wherein reference numerals are as follows:
1. Middle pressure cylinder 1a and steam exhaust port of middle pressure cylinder
2. Low pressure cylinder 2a, steam inlet of low pressure cylinder
2B, exhaust port 3 of low pressure cylinder, deaerator
3A, an inlet 3b of the deaerator and an outlet of the deaerator
4. Desuperheater 4a, steam inlet of desuperheater
4B, a water inlet 4c of the desuperheater, an outlet of the desuperheater
5. Heat exchanger 5a, hot side inlet of heat exchanger
5B, a hot end outlet 5c of the heat exchanger, and a cold end inlet of the heat exchanger
5D, a cold end outlet 6 of the heat exchanger and a high-pressure cylinder
7. Heat supply network water return pipe 8 and heat supply network water supply pipe
9. Feed pump 9a, inlet of feed pump
9B, outlet 10 of feed water pump, drain pump
10A, inlet 10b of a hydrophobic pump, outlet of a hydrophobic pump
11. Heat supply network water circulation pump 11a and inlet of heat supply network water circulation pump
11B, outlet of a heat supply network water circulation pump
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to be limiting.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
As shown in fig. 1, an embodiment of the present invention provides a medium-exhaust steam extraction water spray heating system. The medium-pressure steam extraction water spray heating system of the present embodiment includes a medium-pressure cylinder 1, a low-pressure cylinder 2, a deaerator 3, a desuperheater 4, and a heat exchanger 5, and in addition, the medium-pressure steam extraction water spray heating system of the present embodiment may further include a boiler (not shown in the figure), a high-pressure cylinder 6, and a condenser (not shown in the figure).
The steam outlet of the boiler is connected with the steam inlet of the high-pressure cylinder 6, the steam outlet of the high-pressure cylinder 6 is connected with the reheat steam inlet of the boiler, the reheat steam outlet of the boiler is connected with the steam inlet of the medium-pressure cylinder 1, the steam outlet 1a of the medium-pressure cylinder 1 is connected with the steam inlet 2a of the low-pressure cylinder 2, the steam outlet 2b of the low-pressure cylinder 2 is connected with the inlet 3a of the deaerator 3 through a condenser, namely, the steam outlet of the low-pressure cylinder 2 is connected with the inlet of the condenser, the outlet of the condenser is connected with the inlet 3a of the deaerator 3, and the outlet 3b of the deaerator 3 is connected with the inlet of the boiler. The high-temperature high-pressure steam in the boiler is introduced into a steam inlet of a high-pressure cylinder 6 from a steam outlet of the boiler, enters the high-pressure cylinder 6 for doing work, the steam subjected to the work in the high-pressure cylinder 6 is discharged from a steam outlet of the high-pressure cylinder 6 and introduced into a reheat steam inlet of the boiler, enters the boiler for reheating and heating, then is introduced into a steam inlet of a middle-pressure cylinder 1 from a reheat steam outlet of the boiler, enters the middle-pressure cylinder 1 for doing work, the steam subjected to the work in the middle-pressure cylinder 1 is discharged from a steam outlet 1a of the middle-pressure cylinder 1 and introduced into a steam inlet 2a of a low-pressure cylinder 2, enters the low-pressure cylinder 2 for doing work, the steam subjected to the work in the low-pressure cylinder 2 is discharged from a steam outlet of the low-pressure cylinder 2 and introduced into an inlet of a condenser, and condensed into water in the condenser, the condensed water in the condenser is discharged from an outlet of the condenser and introduced into an inlet 3a of the deaerator 3, the deaerator 3 is discharged from an outlet 3b of the deaerator 3 and introduced into the boiler as water inlet of the boiler.
The desuperheater 4 has a steam inlet 4a, a water inlet 4b and an outlet 4c. The steam inlet 4a of the desuperheater 4 is connected with the steam outlet 1a of the medium pressure cylinder 1, so that part of the steam discharged from the medium pressure cylinder 1 is used as steam extraction and enters the desuperheater 4, namely, the medium-pressure steam extraction is led into the desuperheater 4 through a steam extraction pipeline. The water inlet 4b of the desuperheater 4 is connected with the outlet 3b of the deaerator 3, so that part of the feed water discharged from the outlet 3b of the deaerator 3 is introduced into the desuperheater 4. The medium-exhaust steam extraction in the attemperator 4 and the water supply at the outlet 3b of the deaerator 3 are mixed in the attemperator 4, and the temperature of the water supply discharged from the outlet 3b of the deaerator 3 is lower than the steam extraction temperature of the medium-pressure cylinder 1, so that the temperature of the medium-exhaust steam extraction can be reduced after the water supply in the attemperator 4 is mixed with the medium-exhaust steam extraction, the water supply absorbs the heat of the medium-exhaust steam extraction and evaporates into steam, and the steam is mixed with the medium-exhaust steam extraction to form heating steam, and the heating steam is discharged from the outlet 4c of the attemperator 4.
The heat exchanger 5 is provided with a hot end inlet 5a, a hot end outlet 5b, a cold end inlet 5c and a cold end outlet 5d, the hot end inlet 5a of the heat exchanger 5 is communicated with the hot end outlet 5b to form a hot end channel, and the cold end inlet 5c of the heat exchanger 5 is communicated with the cold end outlet 5d to form a cold end channel. The outlet 4c of the desuperheater 4 is connected with the hot end inlet 5a of the heat exchanger 5, the hot end outlet 5b of the heat exchanger 5 is connected with the inlet 3a of the deaerator 3, the cold end inlet 5c of the heat exchanger 5 is connected with the heat supply network water return pipe 7, the heat supply network water return pipe 7 is connected with a heat supply network user water outlet, the cold end outlet 5d of the heat exchanger 5 is connected with the heat supply network water supply pipe 8, and the heat supply network water supply pipe 8 is connected with a heat supply network user water inlet. The heat supply steam discharged from the outlet 4c of the desuperheater 4 enters from the hot end inlet 5a of the heat exchanger 5 and flows through the hot end channel of the heat exchanger 5, the connecting pipeline of the outlet 4c of the desuperheater 4 and the hot end inlet 5a of the heat exchanger 5 is the heat supply steam pipeline, the backwater discharged from the water outlet of the heat supply network user is fed into the heat supply network backwater pipe 7, and the backwater in the heat supply network backwater pipe 7 enters from the cold end inlet 5c of the heat exchanger 5 and flows through the cold end channel of the heat exchanger 5. The heat-supplying steam and the backwater exchange heat when flowing through the hot end channel and the cold end channel of the heat exchanger 5 respectively, and release and absorb heat respectively. The heat-supply steam is condensed into water after releasing heat, the condensed water is discharged from a hot end outlet 5b of the heat exchanger 5 and is introduced into an inlet 3a of the deaerator 3, and the condensed water is fed into the deaerator 3 to be deoxidized and is also discharged from an outlet 3b of the deaerator 3 as water supply. The backwater absorbs heat and then heats up to reach the heat supply network demand temperature, and then is discharged from a cold end outlet 5d of the heat exchanger 5 and is led into a heat supply network water supply pipe 8, and is sent to a heat supply network user water inlet by the heat supply network water supply pipe 8 for use.
Compared with the prior art, the medium-pressure steam extraction and water spray heating system of the embodiment firstly mixes the extracted medium-pressure cylinder 1 steam extraction with the water supply discharged from the outlet 3b of the deaerator 3 in the desuperheater 4 to form heat supply steam with the temperature lower than the medium-pressure steam extraction temperature, then sends the heat supply steam into the heat exchanger 5 through the heat supply steam pipeline to exchange heat with the heat supply network backwater to heat the heat supply network backwater, reduces the temperature of the medium-pressure steam extraction by utilizing the water supply discharged from the outlet 3b of the deaerator 3, reduces the temperature of the heat supply steam in the heat supply steam pipeline, reduces the steam flow rate of unit heat supply, improves the maximum steam extraction amount, can increase the heat supply amount of the heat exchanger 5, namely increases the heat supply amount of a heat supply network user, so as to improve the heating capacity of the system, reduce the equipment working parameters and reduce the economic investment of equipment construction, and on the other hand, because the temperature of the water supply discharged from the outlet 3b of the deaerator 3 is higher than the water supply water self temperature discharged from the outlet of the heat supply network user, the deaerator 3b is higher than the water supply water outlet 3b discharged from the heat supply network user, and the heat supply network backwater is equal to the heat supply network outlet 3b, and the heat supply efficiency is reduced, and the heat supply efficiency of the heat supply network is increased, and the heat supply efficiency is increased by the heat supply network and the heat supply system is compared with the heat supply system. The medium-exhaust steam extraction water spray heating system has the advantages of good heat supply capacity and economy, reasonable structure, reliable system and high equipment safety.
In this embodiment, preferably, the mode of mixing the water supply from the outlet 3b of the deaerator 3 into the attemperator 4 and the medium-exhaust steam extraction into the attemperator 4 is water supply spraying medium-exhaust steam extraction, and the spraying mode can fully mix the medium-exhaust steam extraction into the attemperator 4 and the water supply from the outlet 3b of the deaerator 3 into the attemperator 4, so as to effectively reduce the temperature of the medium-exhaust steam extraction.
In this embodiment, the outlet 3b of the deaerator 3 may preferably be connected to the water inlet 4b of the desuperheater 4 by a feed pump 9. The inlet 9a of the feed pump 9 is connected to the outlet 3b of the deaerator 3, and the outlet 9b of the feed pump 9 is connected to both the inlet of the boiler and the inlet 4b of the desuperheater 4. The feed water discharged from the outlet 3b of the deaerator 3 is fed to the boiler and the desuperheater 4 in two paths by the feed water pump 9.
In this embodiment, the outlet 9b of the feedwater pump 9 is preferably connected to the water inlet 4b of the desuperheater 4 by a regulator valve (not shown). The regulating valve is provided on a pipe connecting the outlet 9b of the feed pump 9 and the water inlet 4b of the desuperheater 4 for regulating the amount of feed water fed into the desuperheater 4, i.e. regulating the amount of spray water in the desuperheater 4. The parameters of heating steam formed by mixing the middle-exhaust extraction steam and the water supplied by the outlet 3b of the deaerator 3 can be adjusted by adjusting the water spraying amount in the attemperator 4, so that the parameters of the thermal working medium introduced into the heat exchanger 5 can be adjusted more flexibly.
In this embodiment, the hot side outlet 5b of the heat exchanger 5 is preferably connected to the inlet 3a of the deaerator 3 by a hydrophobic pump 10. The inlet 10a of the hydrophobic pump 10 is connected with the hot end outlet 5b of the heat exchanger 5, and the outlet 10b of the hydrophobic pump 10 is connected with the inlet 3a of the deaerator 3. The condensed water discharged from the hot end outlet 5b of the heat exchanger 5 is delivered to the deaerator 3 by the hydrophobic pump 10.
In this embodiment, the heat supply network return pipe 7 is preferably connected to the cold end inlet 5c of the heat exchanger 5 by a heat supply network water circulation pump 11. An inlet 11a of the heat supply network water circulation pump 11 is connected with an outlet of the heat supply network water return pipe 7, and an outlet 11b of the heat supply network water circulation pump 11 is connected with a cold end inlet 5c of the heat exchanger 5. The heat supply network backwater in the heat supply network backwater pipe 7 is conveyed to the heat exchanger 5 under the action of the heat supply network water circulating pump 11.
As shown in fig. 1, the embodiment of the invention also provides a middle-exhaust steam extraction water spray heating method. The method for heating the medium-exhaust steam extraction and water spraying can be realized by adopting the medium-exhaust steam extraction and water spraying heating system of the embodiment. The middle-exhaust steam extraction water spray heat supply method of the embodiment comprises the steps of extracting steam exhausted from a steam outlet 1a of a middle-pressure cylinder 1, mixing the extracted steam with water fed from an outlet 3b of a deaerator 3 in a desuperheater 4 to reduce the temperature of the extracted steam, sending the mixed steam in the desuperheater 4 into a heat exchanger 5 through a heat supply steam pipeline to exchange heat with heat supply network backwater, heating the heat supply network backwater, sending the heat supply network backwater heated in the desuperheater 4 to a water inlet of a heat supply network user for use, condensing the heat exchanged steam in the desuperheater 4 into water, and sending the water into an inlet 3a of the deaerator 3. The exhaust port 1a of the medium pressure cylinder 1 is connected with the steam inlet 2a of the low pressure cylinder 2, and the exhaust port 2b of the low pressure cylinder 2 is connected with the inlet 3a of the deaerator 3.
Compared with the prior art, the medium-pressure steam extraction and water spray heat supply method is characterized in that medium-pressure steam extraction and water spray heat supply is directly carried out through a heat supply steam pipeline to a heat exchange device to exchange heat with heat supply network backwater, the extracted medium-pressure steam extraction and water spray heat supply method firstly mixes water discharged from an outlet 3b of a deaerator 3 with the extracted medium-pressure cylinder 1 in a desuperheater 4 to form heat supply steam with the temperature lower than the medium-pressure steam extraction, the heat supply steam is then carried out through the heat supply steam pipeline to a heat exchanger 5 to exchange heat with the heat network backwater to heat the heat supply network backwater, the water discharged from an outlet 3b of the deaerator 3 reduces the temperature of the medium-pressure steam extraction, on the one hand, the heat supply steam temperature in the heat supply steam pipeline is reduced, the steam flow rate of unit heat supply quantity is reduced, the maximum steam extraction quantity is increased, the heat supply quantity of the heat exchanger 5 can be increased, namely the heat supply quantity of a heat supply network user is increased, therefore, the heat supply capacity of the system is improved, the equipment working parameters are reduced, and the economic investment of equipment construction is reduced, on the other hand, the temperature of the water discharged from the outlet 3b of the deaerator 3 is higher than the water temperature discharged from the water outlet of the heat supply network user is required to exchange water, and the water discharged from the heat supply network user is higher than the temperature discharged from the heat supply network backwater, and the heat supply steam is correspondingly increased by the heat supply steam of the heat supply network user, and the heat supply steam is used as the heat supply steam pump output by the heat supply system, and the heat supply steam is effectively used for heat supply steam.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (6)
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| JP3722928B2 (en) * | 1996-11-22 | 2005-11-30 | 株式会社東芝 | Waste heat recovery boiler unit |
| US7793501B2 (en) * | 2008-10-03 | 2010-09-14 | General Electric Company | Apparatus for steam attemperation using fuel gas heater water discharge to reduce feedwater pump size |
| US20110094228A1 (en) * | 2009-10-22 | 2011-04-28 | Foster Wheeler Energy Corporation | Method of Increasing the Performance of a Carbonaceous Fuel Combusting Boiler System |
| CN206144613U (en) * | 2016-09-05 | 2017-05-03 | 华能国际电力股份有限公司 | Thermoelectric decoupling heating system for extracting steam from power station boiler |
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