CN114754401A - Cogeneration system and method with absorption heat pump and steam ejector - Google Patents
Cogeneration system and method with absorption heat pump and steam ejector Download PDFInfo
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- CN114754401A CN114754401A CN202210252508.5A CN202210252508A CN114754401A CN 114754401 A CN114754401 A CN 114754401A CN 202210252508 A CN202210252508 A CN 202210252508A CN 114754401 A CN114754401 A CN 114754401A
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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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of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
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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
- F24D2200/32—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]
Abstract
The invention relates to a combined heat and power generation system and a method with an absorption heat pump and a steam ejector, wherein the combined heat and power generation system comprises a steam turbine, a heater, a deaerator, the absorption heat pump and the steam ejector; meanwhile, a steam injection device is introduced to heat the backwater of the heat supply network for three times, so that the heat utilization rate of the steam turbine is improved, the heating end difference is reduced, and the available energy loss caused by heat exchange is reduced.
Description
Technical Field
The invention relates to the technical field of cogeneration, in particular to a cogeneration system provided with an absorption heat pump and a steam ejector.
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 still is the most effective way for realizing environmental protection, cost pressure balance and low-carbon heat supply in a long period in the future. The combined heat and power generation unit still undertakes industry and winter resident's heat load when undertaking the electric load, traditional steam power plant is when heating resident's heating water, directly will extract steam heating resident heating water, resident heating water's temperature is lower, the temperature in combined heat and power generation system's heat transfer end is far above resident heating water's temperature, it is great that the heating difference in temperature leads to the available energy loss greatly, simultaneously when needs high-quality steam, often need to extract the steam of the higher quality of steam turbine, influence steam turbine output electric power.
Disclosure of Invention
In order to overcome the defect of large loss of available energy caused by large heating temperature difference in the prior art, the invention provides a cogeneration system with an absorption heat pump and a steam ejector.
In order to realize the purpose, the invention adopts the following technical scheme:
a cogeneration system configured with an absorption heat pump and a steam ejector comprises a steam turbine, a condenser, a heater, a deaerator, the absorption heat pump and a steam ejector, 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 first and the second end of the pipe are connected with each other,
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 absorption heat pump comprises an absorber, a generator and a condenser, the absorber is connected with the generator, the generator is connected with the condenser, meanwhile, the generator is connected with the first steam passage through a steam extraction valve of the generator, the absorber comprises an absorber heat exchanger, the condenser comprises a condenser heat exchanger,
The absorber heat exchanger, the ejector heat exchanger and the condenser heat exchanger sequentially heat return water of a heat supply network in a heat supply network loop.
Preferably, the heat supply network loop passes through the absorber heat exchanger, the ejector heat exchanger and the condenser heat exchanger in sequence and then is output;
the water inlet of the heat supply network loop is connected with the inlet of the absorber heat exchanger, the outlet of the absorber heat exchanger is connected with the inlet of the ejector heat exchanger, the outlet of the ejector heat exchanger is connected with the inlet of the condenser heat exchanger, and the outlet of the condenser heat exchanger is connected with the water outlet of the heat supply network loop.
Preferably, the generator further comprises a generator circulating pump and a generator heat exchanger, an outlet of the generator heat exchanger is connected with an inlet of the generator circulating pump, and an outlet of the generator circulating pump is connected with the deaerator.
Preferably, the generator heat exchanger comprises a heat exchange pipeline, an inlet of the heat exchange pipeline is connected with the generator steam extraction valve, and an outlet of the heat exchange pipeline is connected with an inlet of the generator circulating pump;
the heat exchange pipeline is in a snake shape or a ring shape.
Preferably, a solution heat exchanger is connected between the absorber and the generator;
a dilute solution outlet of the absorber is communicated with a first inlet of the solution heat exchanger and is introduced into the generator through the solution heat exchanger, and a concentrated solution outlet of the generator is communicated with a second inlet of the solution heat exchanger and is introduced into the absorber after passing through the solution heat exchanger;
a solution pump is arranged between the dilute solution outlet and the first inlet and is used for guiding the dilute solution to the generator from the absorber; a generator throttle valve is arranged between the solution heat exchanger and the absorber.
Preferably, the condenser is connected with the absorber, and condensed water in the condenser is conveyed to the absorber through a condenser throttle valve.
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 absorption heat pump is a first type of lithium bromide absorption heat pump.
In order to achieve the purpose, the invention also adopts the following technical scheme:
a combined heat and power generation method provided with an absorption heat pump and a steam ejector comprises the combined heat and power generation 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;
controlling the generator steam extraction valve to extract steam from the first steam passage to exchange heat with the generator, wherein the generator transfers heat to the condenser;
the return water of the heat supply network and the heat exchanger of the absorber are heated for the first time;
the return water of the heat supply network is contacted with the heat exchanger of the ejector to carry out secondary heating;
and the return water of the heat supply network is contacted with the heat exchanger of the condenser to carry out heating for the third time.
Compared with the prior art, the invention has the beneficial effects that:
the combined heat and power generation system is combined with the absorption heat pump, and steam of the steam turbine is used as a heat source, so that the heat supply capacity of the combined heat and power generation system is improved, and the thermoelectricity coupling of the combined heat and power generation system is relieved to a certain extent; meanwhile, a steam injection device is introduced to heat the backwater of the heat supply network for three times, so that the heat utilization rate of the steam turbine is improved, the heating end difference is reduced, and the available energy loss caused by heat exchange is reduced.
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 configured with an absorption heat pump and a steam ejector according to 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 condensed gas water pump; 2. a steam ejector; 21. a low pressure valve; 22. a high pressure valve; 23. an ejector heat exchanger; 3. an absorption heat pump; 31. an absorber; 32. a generator; 321. a generator steam extraction valve; 322. a generator circulation pump; 33. a condenser; 331. a condenser throttle valve; 34. a solution heat exchanger; 35. a solution pump; 36. a generator throttle valve; 4. and returning water to 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 is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to 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 simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" 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, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 specific cases to those skilled in the art.
At present, the contradiction between domestic resident heating demand and insufficient heating capacity is gradually revealed, and meanwhile, the centralized heating of enterprises becomes the trend of the future urban industrial development, so that the heating demand in cities is large. However, the urban heat supply power plant is limited by environmental protection policies and geographical location restrictions to increase capacity and space, and under the condition that new heat source projects are not added, the problem that the heat supply capacity of the urban heat supply power plant is insufficient is solved by improving the heat supply capacity of the existing equipment through technical upgrading and transformation. The traditional coal-fired boiler has low efficiency, and a large amount of low-grade waste heat cannot be utilized, thereby causing huge waste of energy. Meanwhile, a huge gap exists in heat supply. When the traditional thermal power plant heats the return water of the heat supply network, the extracted steam is directly used for heating the return water of the heat supply network, the heat exchange end difference is large, and the available energy loss is large. When a heat pump is introduced to heat the return water of a heating network, a larger temperature difference exists between the condenser and the absorber, and a larger available energy loss still exists by simply heating the condenser and the absorber, so that heating equipment is required to be added between the condenser and the absorber.
As shown in fig. 1, an embodiment of the present invention provides a cogeneration system configured with an absorption heat pump and a steam ejector, including a steam turbine 1, a condenser 11, a heater 12, a deaerator 13, an absorption heat pump 3, and a steam ejector, where the steam turbine 1 is communicated with the heater 12 through a first steam passage 14, and the steam turbine 1 is communicated with the deaerator 13 through a second steam passage 15. The exhaust steam pipeline of the steam turbine 1 is connected with the condenser 11, the condenser 11 condenses the exhaust steam of the steam turbine 1 into water, then is carried to the heater 12 by the condensate gas water pump 16, the steam turbine 1 is communicated with the heater 12 through the first steam passage 14, the heater 12 heats the water that the exhaust steam condenses into again, carry to the steam turbine 1, simultaneously, part of water in the heater 12 is carried to the deaerator 13, and the steam turbine 1 is communicated with the deaerator 13 through the second steam passage 15, the deaerator 13 is used for detaching oxygen and other gases in the aquatic, guarantee the quality of feedwater, and further heat the boiler feedwater, the steam temperature in the second steam passage 15 is higher than the steam temperature in the first steam passage 14.
The absorption heat pump 3 comprises an absorber 31, a generator 32 and a condenser 33, wherein the absorber 31 is connected with the generator 32, the generator 32 is connected with the condenser 33, meanwhile, the generator 32 is connected with the first steam passage 14 through a generator steam extraction valve 321, the absorber 31 comprises an absorber heat exchanger (not shown), and the condenser 33 comprises a condenser heat exchanger (not shown); in this embodiment, the absorber 31 is in the low-pressure region, and the generator 32 is in the high-pressure region, so that the temperature of the heat exchanger of the absorber is lower than that of the heat exchanger of the condenser, the return water 4 of the heat supply network in the heat supply network loop is firstly heated with the heat exchanger of the absorber for the first time, and at this time, the temperature difference between the heat exchange end and the return water 4 of the heat supply network is small, thereby reducing the available energy loss caused by heat exchange.
Then, 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, and the utilization rate of the steam with lower temperature is improved. Concretely, steam injection apparatus includes low-pressure valve 21, high-pressure valve 22, steam ejector 2 and ejector heat exchanger 23, low-pressure valve 21 communicates the low pressure import of first steam flue 14 and steam ejector 2 for guide steam in the first steam flue 14, high-pressure valve 22 communicates the high pressure import of second steam flue 15 and steam ejector 2, be used for guiding the steam in the second steam flue 15, then, high temperature steam mixes in steam ejector 2 with steam lower temperature, steam ejector 2's steam outlet and ejector heat exchanger 23 are connected. The heat supply network loop is connected with the ejector heat exchanger 23, and the heat supply network backwater 4 is heated for the second time by the mixed steam of the ejector heat exchanger 23, so that the steam heat utilization rate in the first steam passage 14 with lower temperature is improved. And finally, the heat supply network backwater 4 flowing out of the ejector heat exchanger 23 is heated for the third time in the condenser heat exchanger, so that three-stage heating is finally realized, the heat exchange end difference is reduced compared with the traditional heating method, and the available energy loss in the heating heat supply network backwater 4 is reduced.
In the embodiment, the absorption heat pump, the steam ejector and the steam turbine are combined, and the steam ejector 2 can flexibly adjust the temperature of output heat and can be used as an intermediate-stage heating heat source to reduce heat exchange temperature difference. Firstly, the absorber 31 is utilized to heat the return water of the heat supply network for the first stage; the temperature of the mixed steam in the steam ejector 2 is flexibly adjusted by adjusting and controlling the steam extraction flow of the high-pressure valve 22 and the low-pressure valve 21, and the temperature is adjusted and controlled to be between the working temperatures of the absorber 31 and the condenser 33, so that the return water of the heat supply network is subjected to secondary heating; finally, a condenser 33 is used for heating the heat supply network for returning water. By the scheme, the heat transfer temperature difference of the return water of the heat supply network is reduced, so that the available energy loss caused by heat exchange is reduced; and the three-stage heating equipment is utilized, the steam extraction amount of the two steam extraction ports is flexibly adjusted according to the variable working condition of the steam turbine, and the stability of the water supply temperature of the heat supply network is guaranteed.
Preferably, the absorption heat pump 3 of the present embodiment is a first type of lithium bromide absorption heat pump. Of course, in other embodiments, the absorption heat pump may employ the first type absorption heat pump with other working mediums.
Specifically, the heat supply network loop passes through the absorber heat exchanger, the ejector heat exchanger 23 and the condenser heat exchanger in sequence and then is output; the water inlet of the heat supply network loop is connected with the inlet of the absorber heat exchanger, the outlet of the absorber heat exchanger is connected with the inlet of the ejector heat exchanger 23, the outlet of the ejector heat exchanger 23 is connected with the inlet of the condenser heat exchanger, and the outlet of the condenser heat exchanger is connected with the water outlet of the heat supply network loop.
The steam input into the absorption heat pump 3 can be re-input to the deaerator 13 after being cooled, so that the steam consumption of the deaerator 13 is saved, specifically, the generator 32 further comprises a generator circulating pump 322 and a generator heat exchanger (not shown), the outlet of the generator heat exchanger is connected with the inlet of the generator circulating pump 322, and the outlet of the generator circulating pump 322 is connected with the deaerator 13.
The generator heat exchanger comprises a heat exchange pipeline (not shown), the inlet of the heat exchange pipeline is connected with the generator steam extraction valve 321, the outlet of the heat exchange pipeline is connected with the inlet of the generator circulating pump 322, and the heat exchange pipeline is in a snake shape or an annular shape for improving the heat utilization rate and realizing sufficient heat exchange.
In this embodiment, the absorber is a low pressure region, the generator is a high pressure region, and the flow direction of the rich solution is from the absorber 31 to the generator 32, so that a solution heat exchanger 34 is connected between the absorber 31 and the generator 32; the dilute solution outlet of the absorber 31 is communicated with the first inlet of the solution heat exchanger 34 and is introduced into the generator 32 through the solution heat exchanger 34, and the concentrated solution outlet of the generator 32 is communicated with the second inlet of the solution heat exchanger 34 and is introduced into the absorber 31 after passing through the solution heat exchanger 34; a solution pump 35 is arranged between the dilute solution outlet and the first inlet, and the solution pump 35 is used for guiding the dilute solution from the absorber 31 to the generator 32; a generator throttle 36 is provided between the solution heat exchanger 34 and the absorber 31 for controlling the flow of solution to the generator 32.
In order to replenish the vapor in the absorber 31 and generate a dilute solution more quickly, it is preferable that the condenser 33 is connected to the absorber 31, the condensed water in the condenser 33 is delivered to the absorber 31 through a condenser throttle valve 331, and the condenser throttle valve 331 is used to control the flow rate of the condensed water.
Certainly, in other embodiments, the condenser 33 may also be connected to the deaerator 13, and the condensed water is conveyed back to the deaerator 13 to serve as make-up water, so that steam consumption of the deaerator 13 is saved, and material balance between the working medium in the absorption heat pump and the working medium in the steam turbine is also considered.
Preferably, in this embodiment, the ejector heat exchanger 23 is connected to the deaerator 13, the temperature of the steam flowing into the ejector heat exchanger 23 is reduced, and the steam is then conveyed back to the deaerator 13 to be used as steam supplement, so that the steam consumption of the deaerator 13 is saved, and the material balance between the working medium in the absorption heat pump and the working medium in the steam turbine is also considered.
The embodiment of the invention also provides a cogeneration method configured with the absorption heat pump and the steam ejector, wherein the cogeneration system 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;
Controlling the generator steam extraction valve to extract steam from the first steam passage to exchange heat with the generator, and transferring heat to the condenser by the generator;
the return water of the heat supply network and the heat exchanger of the absorber are heated for the first time;
the return water of the heat supply network is contacted with the heat exchanger of the ejector to carry out secondary heating;
and the return water of the heat supply network is contacted with the heat exchanger of the condenser to carry out heating for the third time.
In the embodiment, the absorption heat pump, the steam ejector and the steam turbine are combined, and the steam ejector 2 can flexibly adjust the temperature of output heat and can be used as an intermediate-stage heating heat source to reduce the heat exchange temperature difference. Firstly, utilizing an absorber 31 to heat the return water of the heat supply network for the first stage; the temperature of mixed steam in the steam ejector 2 is flexibly adjusted by adjusting and controlling the steam extraction flow of the high-pressure valve 22 and the low-pressure valve 21, and the temperature is adjusted and controlled to be between the working temperatures of the absorber 31 and the condenser 33, so that the return water of the heat supply network is subjected to secondary heating; finally, a condenser 33 is used for heating the heat supply network for returning water in three stages. By the scheme, the heat transfer temperature difference of return water of the heat supply network is reduced, so that the available energy loss caused by heat exchange is reduced; and the three-stage heating equipment is utilized, the steam extraction amount of the two steam extraction ports is flexibly adjusted according to the variable working condition of the steam turbine, and the stability of the water supply temperature of the heat supply network is ensured.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are intended to be covered by the claims.
Claims (9)
1. A cogeneration system configured with an absorption heat pump and a steam ejector is characterized by comprising a steam turbine, a heater, a deaerator, at least one absorption heat pump and at least one group of steam ejector, 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 first and the second end of the pipe are connected with each other,
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, a steam outlet of the steam ejector is connected with the ejector heat exchanger, and the low-pressure valve and the high-pressure valve are regulating valves;
the absorption heat pump comprises an absorber, a generator and a condenser, the absorber is connected with the generator, the generator is connected with the condenser, meanwhile, the generator is connected with the first steam passage through a generator steam extraction valve, the absorber comprises an absorber heat exchanger, the condenser comprises a condenser heat exchanger,
The absorber heat exchanger, the ejector heat exchanger and the condenser heat exchanger sequentially heat return water of a heat supply network in a heat supply network loop.
2. The cogeneration system configured with an absorption heat pump and a steam ejector according to claim 1, wherein the heat network loop passes through the absorber heat exchanger, the ejector heat exchanger and the condenser heat exchanger in sequence and is then output;
the water inlet of the heat supply network loop is connected with the inlet of the absorber heat exchanger, the outlet of the absorber heat exchanger is connected with the inlet of the ejector heat exchanger, the outlet of the ejector heat exchanger is connected with the inlet of the condenser heat exchanger, and the outlet of the condenser heat exchanger is connected with the water outlet of the heat supply network loop.
3. The cogeneration system configured with an absorption heat pump and a steam ejector according to claim 1, wherein the generator further comprises a generator circulation pump and a generator heat exchanger, an outlet of the generator heat exchanger is connected to an inlet of the generator circulation pump, and an outlet of the generator circulation pump is connected to the deaerator.
4. The cogeneration system configured with an absorption heat pump and a steam ejector according to claim 3, wherein the generator heat exchanger comprises a heat exchange line, an inlet of the heat exchange line is connected to the generator extraction valve, and an outlet of the heat exchange line is connected to an inlet of the generator circulation pump;
The heat exchange pipeline is in a snake shape or a ring shape.
5. The cogeneration system configured with an absorption heat pump and a steam ejector according to claim 1, wherein a solution heat exchanger is connected between the absorber and the generator;
a dilute solution outlet of the absorber is communicated with a first inlet of the solution heat exchanger and is introduced into the generator through the solution heat exchanger, and a concentrated solution outlet of the generator is communicated with a second inlet of the solution heat exchanger and is introduced into the absorber after passing through the solution heat exchanger;
a solution pump is arranged between the dilute solution outlet and the first inlet and is used for guiding the dilute solution to the generator from the absorber; a generator throttle valve is arranged between the solution heat exchanger and the absorber.
6. The cogeneration system with configured absorption heat pump and steam ejector of claim 5, wherein the condenser is connected to the absorber, and wherein the condensate in the condenser is delivered to the absorber through a condenser throttle valve.
7. The cogeneration system configured with an absorption heat pump and a steam ejector according to 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.
8. A cogeneration system configured with an absorption heat pump and a steam ejector according to claim 1, wherein the absorption heat pump is a first type of lithium bromide absorption heat pump.
9. A cogeneration method configured with an absorption heat pump and a steam ejector, comprising the cogeneration system of any one of claims 1 to 8, 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;
controlling the generator steam extraction valve to extract steam from the first steam passage to exchange heat with the generator, wherein the generator transfers heat to the condenser;
the return water of the heat supply network and the heat exchanger of the absorber are heated for the first time;
the return water of the heat supply network is contacted with the heat exchanger of the ejector to carry out secondary heating;
and the return water of the heat supply network is contacted with the heat exchanger of the condenser to carry out heating for the third time.
Priority Applications (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117704675B (en) * | 2024-02-02 | 2024-04-19 | 广东美的暖通设备有限公司 | Vapor compression heat pump system |
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| CN114754401B (en) | 2023-06-20 |
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