CN114754399A - Cogeneration system and method for secondary heating industrial heat supply network - Google Patents
Cogeneration system and method for secondary heating industrial heat supply network Download PDFInfo
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- CN114754399A CN114754399A CN202210239439.4A CN202210239439A CN114754399A CN 114754399 A CN114754399 A CN 114754399A CN 202210239439 A CN202210239439 A CN 202210239439A CN 114754399 A CN114754399 A CN 114754399A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000010793 Steam injection (oil industry) Methods 0.000 claims abstract description 8
- 239000006096 absorbing agent Substances 0.000 claims description 71
- 239000000243 solution Substances 0.000 claims description 27
- 238000000605 extraction Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000010248 power generation Methods 0.000 claims description 3
- 238000003303 reheating Methods 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- 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
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/44—Use of steam for feed-water heating and another purpose
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- 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
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/04—Heat pumps of the sorption type
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- 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
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
- F24D2200/126—Absorption type heat pumps
-
- 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
- F24D2200/00—Heat sources or energy sources
- F24D2200/32—Heat sources or energy sources involving multiple heat sources in combination or as alternative heat sources
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to a cogeneration system and a method for secondarily heating an industrial heat supply network, wherein the cogeneration system comprises a steam turbine, a heater, a deaerator, a heat pump and a steam injection device; meanwhile, the heat pump is utilized to convert the medium-quality heat into high-quality heat for secondary heating of the return steam of the heat supply network, so that the consumption of the high-quality steam of the steam turbine is saved, and the energy utilization efficiency is improved; the secondary heating greatly improves the steam heat utilization rate of the steam turbine and also reduces the available energy loss caused by the temperature difference.
Description
Technical Field
The invention relates to the technical field of cogeneration, in particular to a cogeneration system and a method for a secondary heating industrial heat supply network.
Background
In recent years, the industrial heat supply amount of China is continuously increased, China is a big coal-fired country, and clean coal-fired centralized heat supply is still the most effective way for realizing environmental protection, cost pressure balance and low-carbon heat supply in a long period of time in the future. Traditional steam power plant is when heating industry heat supply network, and direct steam extraction heating industry heat supply network, the temperature of industry heat supply network is lower, and the temperature of the heat transfer end of cogeneration system is far higher than the temperature of industry heat supply network, and the heating difference in temperature leads to the available energy loss great greatly, and when needs high-quality steam, often need extract the steam of the higher quality of steam turbine simultaneously, influence steam turbine output electric power.
Disclosure of Invention
In order to solve the problem of large temperature difference between a heat exchange end of a cogeneration system and an industrial heat supply network in the prior art, the invention provides a cogeneration system and a method for secondarily heating the industrial heat supply network.
In order to realize the purpose, the invention adopts the following technical scheme:
a cogeneration system of a secondary heating industrial heat supply network comprises a steam turbine, a condenser, a heater, a deaerator, a heat pump and a steam injection device, wherein the steam turbine is communicated with the heater through a first steam passage, and the steam turbine is communicated with the deaerator through a second steam passage; wherein,
the steam ejector device comprises a low-pressure valve, a high-pressure valve, a steam ejector and an ejector heat exchanger, the low-pressure valve is communicated with the first steam passage and a low-pressure inlet of the steam ejector, the high-pressure valve is communicated with the second steam passage and a high-pressure inlet of the steam ejector, and a steam outlet of the steam ejector is connected with the ejector heat exchanger; the heat pump is connected with the first steam passage, and the heat pump comprises a heat pump heat exchanger; the ejector heat exchanger and the heat pump heat exchanger heat return steam of a heat supply network in sequence.
Preferably, the heat pump comprises an absorber, a generator and a condenser, the absorber is connected with the generator, and the generator is connected with the condenser;
The absorber is connected with an absorber steam extraction valve, the absorber steam extraction valve is connected with the absorber and the first steam passage, the heat pump heat exchanger is an absorber heat exchanger, and the ejector heat exchanger and the absorber heat exchanger heat the return steam of the heat supply network in sequence.
Preferably, the condenser is connected with the deaerator, and condensed water in the condenser is conveyed back to the deaerator through a condensed water pump.
Preferably, a solution pump, a solution heat exchanger and a generator throttle valve are connected between the absorber and the generator.
Preferably, the ejector heat exchanger is connected with the deaerator, and steam flowing into the ejector heat exchanger is conveyed back to the deaerator.
Preferably, the heat pump is a second type of lithium bromide absorption heat pump.
In order to achieve the purpose, the invention also adopts the following technical scheme:
a cogeneration method of a secondary heating industrial heat supply network adopts the cogeneration system and comprises the following steps:
controlling the low-pressure valve to extract steam from the first steam passage, controlling the high-pressure valve to extract steam from the second steam passage, mixing the two streams of steam in the steam ejector, and ejecting the mixed steam into the ejector heat exchanger;
The return steam of the heat supply network is contacted with the heat exchanger of the ejector to carry out primary heating;
controlling part of the steam in the first steam passage to enter the heat pump,
and the return steam of the heat supply network is contacted with the heat pump heat exchanger to carry out secondary heating.
Preferably, the heat pump comprises an absorber, a generator and a condenser, an absorber steam extraction valve is connected to the absorber, the absorber steam extraction valve is connected to the absorber and the first steam passage, and the heat pump heat exchanger is an absorber heat exchanger;
the step of controlling part of the steam in the first steam passage to enter the heat pump comprises the following steps:
controlling the absorber extraction valve to extract vapor from the first vapor passage into the absorber, the absorber transferring heat to the absorber heat exchanger;
the return steam of the heat supply network is contacted with the heat pump heat exchanger, and the step of heating for the second time comprises the following steps:
and the return steam of the heat supply network and the heat exchanger of the absorber perform secondary heating.
Compared with the prior art, the invention has the beneficial effects that:
according to the cogeneration system and the cogeneration method for the secondary heating industrial heat supply network, the steam injection device is used for mixing the steam with two temperatures and is used for the first heating of the return steam of the heat supply network, so that the heating end difference is reduced, and the available energy loss caused by heat exchange is reduced; meanwhile, the heat pump is utilized to convert the medium-quality heat into high-quality heat for secondary heating of the return steam of the heat supply network, so that the consumption of the high-quality steam of the steam turbine is saved, and the energy utilization efficiency is improved; the secondary heating greatly improves the steam heat utilization rate of the steam turbine and also reduces the available energy loss caused by the temperature difference.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a cogeneration system of a reheat industrial heat network provided in an embodiment of the present invention.
Description of the reference numerals:
1. a steam turbine; 11. a condenser; 12. a heater; 13. a deaerator; 14. a first steam passage; 15. a second steam passage; 16. a condensate pump; 2. a steam ejector; 21. a low pressure valve; 22. a high pressure valve; 23. an ejector heat exchanger; 3. a heat pump; 31. an absorber; 311. an absorber extraction valve; 32. a generator; 33. a condenser; 331. a condensate pump; 34. a solution heat exchanger; 35. a solution pump; 36. a generator throttle valve; 4. and (5) returning steam of the heat supply network.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "first," and "second" 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, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
As shown in fig. 1, an embodiment of the present invention provides a cogeneration system for secondarily heating an industrial heat network, including a steam turbine 1, a condenser 11, a heater 12, a deaerator 13, a heat pump 3, and a steam injection device, wherein a steam exhaust pipe of the steam turbine 1 is connected to the condenser 11, the condenser 11 condenses steam exhaust of the steam turbine 1 into water, then the steam is transmitted to a heater 12 by a condensate pump 16, the steam turbine 1 is communicated with the heater 12 through a first steam passage 14, the heater 12 reheats the water condensed by the exhaust steam, and transmits the water to the steam turbine 1, meanwhile, part of the water in the heater 12 is conveyed to the deaerator 13, the steam turbine 1 is communicated with the deaerator 13 through the second steam passage 15, the deaerator 13 is used for removing oxygen and other gases in the water to ensure the quality of the water supply, and further heats the boiler feed water, the steam temperature in the second steam passage 15 being higher than the steam temperature in the first steam passage 14.
The steam injection device is used for mixing the steam of the first steam passage 14 and the steam of the second steam passage 15, so that the utilization rate of the steam with lower temperature is improved, and the temperature difference between the heat exchange end and the industrial heat supply network is reduced. Specifically, the steam ejector device comprises a low-pressure valve 21, a high-pressure valve 22, a steam ejector 2 and an ejector heat exchanger 23, wherein the low-pressure valve 21 is communicated with a low-pressure inlet of the first steam passage 14 and a low-pressure inlet of the steam ejector 2 and used for guiding steam in the first steam passage 14, the high-pressure valve 22 is communicated with a second steam passage 15 and a high-pressure inlet of the steam ejector 2 and used for guiding steam in the second steam passage 15, then, high-temperature steam and low-temperature steam are mixed in the steam ejector 2, and a steam outlet of the steam ejector 2 is connected with the ejector heat exchanger 23; the industrial heat supply network is connected with the ejector heat exchanger 23, the return steam 4 of the heat supply network is heated by the mixed steam of the ejector heat exchanger 23 for one time, the temperature difference between the two is small, and the available energy loss caused by heat exchange is reduced.
Preferably, the ejector heat exchanger 23 is connected with the deaerator 13, the temperature of the steam flowing into the ejector heat exchanger 23 is reduced, and the steam is conveyed back to the deaerator 13 to be used as steam supplement, so that the steam consumption of the deaerator 13 is saved.
The heat pump 3 is connected with the first steam passage 14, the heat pump 3 is used for absorbing part of steam with lower temperature in the first steam passage 14 to realize that high-quality heat is obtained from medium-quality heat, and the heat pump 3 comprises a heat pump heat exchanger; the temperature of the heat supply network return steam 4 from the ejector heat exchanger 23 is increased, then the heat supply network return steam is heated in the heat pump heat exchanger in a contact manner for secondary heating, and the temperature of the heat supply network return steam 4 from the heat pump heat exchanger reaches the requirement, so that the heat supply network return steam can be used for industrial heat supply network steam supply.
In the embodiment, the steam injection device is used for mixing the steam with two temperatures and is used for heating the return steam 4 of the heat supply network for the first time, so that the heating end difference is reduced, and the available energy loss caused by heat exchange is reduced; meanwhile, the heat pump 3 is utilized to convert the medium-quality heat into high-quality heat for secondary heating of the return steam 4 of the heat supply network, so that the consumption of high-quality steam of the steam turbine 1 is saved, and the energy utilization efficiency is improved; the secondary heating greatly improves the steam heat utilization rate of the steam turbine 1, and also reduces the available energy loss caused by the temperature difference.
The heat pump 3 of the present embodiment is an absorption heat pump, preferably a second-type lithium bromide absorption heat pump, the heat pump 3 includes an absorber 31, a generator 32 and a condenser 33, the absorber 31 is connected with the generator 32, the generator 32 is connected with the condenser 33, the absorber 31 is connected with an absorber steam extraction valve 311, the absorber steam extraction valve 311 is connected with the absorber 31 and the first steam passage 14, the heat pump heat exchanger is an absorber heat exchanger (not shown), the ejector heat exchanger 23 and the absorber heat exchanger heat the heat supply network steam return 4 in sequence,
the absorber of the heat pump is used as a high-pressure area, the medium-grade extraction heat energy is used for providing the higher-grade heat, the temperature is raised to be higher than that of extraction steam, the extraction steam heating capacity of the steam turbine is fully developed, the consumption of high-quality steam of the steam turbine is saved, and the economical efficiency and the energy utilization efficiency of the unit are improved. Specifically, one part of the heat source of the absorber heat exchanger is derived from the heat of the steam in the first steam passage 14, the other part of the heat source is derived from the heat released by the solution in the absorber 31 for absorbing the steam, and the solution in the absorber absorbs the medium heat of a large amount of steam and releases a small amount of high-quality heat, so that the medium heat is used for obtaining the high-quality heat, the temperature of the return steam of the heat supply network is favorably improved, and the heat supply system is suitable for secondary heating of the return steam of the heat supply network so as to meet the requirement of steam supply of the heat supply network.
A solution pump 35, a solution heat exchanger 34 and a generator throttle 36 are connected between the absorber 31 and the generator 32, a dilute solution outlet of the absorber 31 is communicated with a first inlet of the solution heat exchanger 34 and is introduced into the generator 32 through the solution heat exchanger 34, a concentrated solution outlet of the generator 32 is communicated with a second inlet of the solution heat exchanger 34 and is introduced into the absorber 31 after passing through the solution heat exchanger 34, the solution pump 35 and the generator throttle 36 are arranged between the solution heat exchanger 34 and the generator 32, the solution pump 35 is used for conveying concentrated solution from a low-pressure area to a high-pressure area, in the embodiment, the high-pressure area is an absorber, the low-pressure area is a generator, the solution pump 35 guides the concentrated solution from the generator 32 to the absorber 31, and the generator throttle 36 is used for regulating the flow rate of the concentrated solution flowing to the absorber 31.
The condenser 33 in the heat pump receives and condenses the steam generated by the generator 32; in this embodiment, the condenser 33 is connected to the deaerator 13, and condensed water in the condenser 33 is delivered back to the deaerator 13 through the condensed water pump 331 to serve as make-up water, so that steam consumption of the deaerator 13 is saved, and material balance between a working medium in the heat pump and a working medium in the steam turbine is also considered.
Based on the embodiment, the invention also discloses a combined heat and power generation method of the secondary heating industrial heat supply network, and the combined heat and power generation system adopting the embodiment comprises the following steps:
Controlling a low-pressure valve 21 to extract steam from a first steam passage 14, controlling a high-pressure valve 22 to extract steam from a second steam passage 15, mixing the two streams of steam in a steam ejector 2, and ejecting the mixed steam into an ejector heat exchanger 23;
the return steam 4 of the heat supply network is contacted with the heat exchanger 23 of the ejector to carry out primary heating;
controlling part of the steam in the first steam passage 14 to enter the heat pump 3,
the return steam 4 of the heat supply network is contacted with a heat pump heat exchanger to carry out secondary heating.
In the embodiment, the steam injection device is used for mixing the steam with two temperatures and is used for heating the return steam 4 of the heat supply network for the first time, so that the heating end difference is reduced, and the available energy loss caused by heat exchange is reduced; meanwhile, the heat pump 3 is utilized to convert the medium-quality heat into high-quality heat for secondary heating of the return steam 4 of the heat supply network, so that the consumption of high-quality steam of the steam turbine 1 is saved, and the energy utilization efficiency is improved; the secondary heating greatly improves the steam heat utilization rate of the steam turbine 1, and also reduces the available energy loss caused by the temperature difference.
Preferably, the heat pump 3 comprises an absorber 31, a generator 32 and a condenser 33, the absorber 31 is connected with an absorber steam extraction valve, the absorber steam extraction valve is connected with the absorber and the first steam passage, and the heat pump heat exchanger is an absorber heat exchanger 311;
The step of controlling a portion of the steam in the first steam path 14 to enter the heat pump comprises:
controlling an absorber bleed valve 311 to bleed vapor from the first vapor passage 14 into the absorber 31, the absorber 31 transferring heat to the absorber heat exchanger;
the heat supply network return steam 4 is contacted with a heat pump heat exchanger, and the step of heating for the second time comprises the following steps:
the return steam of the heat supply network and the heat exchanger of the absorber are heated for the second time.
The absorber is used as a high-pressure area, high-grade heat is provided by using medium-grade extraction steam heat energy, the temperature is increased to be higher than that of extraction steam, the extraction steam heat supply capacity of the steam turbine is fully developed, the consumption of high-quality steam of the steam turbine is saved, and the economical efficiency and the energy utilization efficiency of a unit are improved. Specifically, one part of the heat source of the absorber heat exchanger is derived from the steam heat in the first steam passage 14, the other part of the heat source is derived from the heat released by the solution in the absorber 31 for absorbing the steam, the solution in the absorber absorbs the medium heat of a large amount of steam and releases a small amount of high-quality heat, so that the high-quality heat is obtained from the medium heat, the temperature of the return steam of the heat supply network is favorably improved, and the heat source is suitable for the second heating of the return steam of the heat supply network so as to meet the requirement of the steam supply of the heat supply network.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (8)
1. A cogeneration system of a secondary heating industrial heat supply network is characterized by comprising a steam turbine, a heater, a deaerator, a heat pump and at least one group of steam injection devices, wherein the steam turbine is communicated with the heater through a first steam passage and is communicated with the deaerator through a second steam passage; wherein,
the steam ejector device comprises a low-pressure valve, a high-pressure valve, a steam ejector and an ejector heat exchanger, the low-pressure valve is communicated with the first steam passage and a low-pressure inlet of the steam ejector, the high-pressure valve is communicated with the second steam passage and a high-pressure inlet of the steam ejector, and a steam outlet of the steam ejector is connected with the ejector heat exchanger; the heat pump is connected with the first steam passage, and the heat pump comprises a heat pump heat exchanger; the ejector heat exchanger and the heat pump heat exchanger heat return steam of a heat supply network in sequence.
2. A cogeneration system for a reheat industrial heat network in accordance with claim 1, wherein said heat pump comprises an absorber, a generator, and a condenser, said absorber being connected to said generator, said generator being connected to said condenser;
the heat pump heat exchanger is an absorber heat exchanger, and the ejector heat exchanger and the absorber heat exchanger heat the return steam of the heat supply network in sequence.
3. The cogeneration system of a post-heating industrial heat network of claim 2, wherein said condenser is connected to said deaerator, and condensed water in said condenser is pumped back to said deaerator by a condensed water pump.
4. A cogeneration system of a reheat industrial heat network of claim 2, wherein a solution pump, a solution heat exchanger and a generator throttle valve are connected between the absorber and the generator.
5. The cogeneration system of a reheat industrial heat network of claim 1, wherein the ejector heat exchanger is connected to the deaerator and steam flowing into the ejector heat exchanger is delivered back to the deaerator.
6. A cogeneration system for a reheat industrial heat network as set forth in claim 1, wherein said heat pump is a second type lithium bromide absorption heat pump.
7. A cogeneration method of a reheating industrial heat supply network, characterized in that the cogeneration system of any one of claims 1 to 6 is used, comprising the steps of:
controlling the low-pressure valve to extract steam from the first steam passage, controlling the high-pressure valve to extract steam from the second steam passage, mixing the two streams of steam in the steam ejector, and ejecting the mixed steam into the ejector heat exchanger;
The return steam of the heat supply network is contacted with the heat exchanger of the ejector to carry out primary heating;
controlling part of the steam in the first steam passage to enter the heat pump,
and the return steam of the heat supply network is contacted with the heat pump heat exchanger to carry out secondary heating.
8. A combined heat and power generation method of a reheat industrial heat network as set forth in claim 7,
the heat pump comprises an absorber, a generator and a condenser, wherein an absorber steam extraction valve is connected to the absorber, the absorber steam extraction valve is connected with the absorber and the first steam passage, and the heat pump heat exchanger is an absorber heat exchanger;
the step of controlling part of the steam in the first steam passage to enter the heat pump comprises the following steps:
controlling the absorber extraction valve to extract steam from the first steam path into the absorber, the absorber transferring heat to the absorber heat exchanger;
the return steam of the heat supply network is contacted with the heat pump heat exchanger, and the step of heating for the second time comprises the following steps:
and the return steam of the heat supply network and the heat exchanger of the absorber perform second heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210239439.4A CN114754399B (en) | 2022-03-11 | 2022-03-11 | Combined heat and power generation system and method for secondary heating industrial heat supply network |
Applications Claiming Priority (1)
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