CN115095899B - Coal-fired unit coupled compressed air energy storage waste heat supply system and operation method - Google Patents
Coal-fired unit coupled compressed air energy storage waste heat supply system and operation method Download PDFInfo
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- CN115095899B CN115095899B CN202210760735.9A CN202210760735A CN115095899B CN 115095899 B CN115095899 B CN 115095899B CN 202210760735 A CN202210760735 A CN 202210760735A CN 115095899 B CN115095899 B CN 115095899B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 50
- 239000002918 waste heat Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000010521 absorption reaction Methods 0.000 claims abstract description 42
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 51
- 239000007788 liquid Substances 0.000 claims description 21
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000010248 power generation Methods 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 239000003245 coal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
Classifications
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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
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/02—Central heating systems using heat accumulated in storage masses using heat pumps
- F24D11/0214—Central heating systems using heat accumulated in storage masses using heat pumps water heating system
- F24D11/0235—Central heating systems using heat accumulated in storage masses using heat pumps water heating system with recuperation of waste energy
- F24D11/0242—Central heating systems using heat accumulated in storage masses using heat pumps water heating system with recuperation of waste energy contained in exhausted air
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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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- 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)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a coal-fired unit coupling compressed air energy storage waste heat heating system and an operation method. The turbine generator set adopts Rankine cycle as power cycle, the absorption heat pump is coupled, the cold end waste heat of the coal-fired unit is utilized, two energy sources of heat and electricity are provided for users at the same time, the energy release and generation mode of the compressed air energy storage system adopts Brayton cycle as power cycle, and electric energy is output to the outside. Through the coupling optimization of the compressed air energy storage-cold end-absorption heat pump, the energy utilization rate of the coal-fired unit can be greatly improved. The cold end waste heat heating system of the coal-fired unit coupled with the compressed air energy storage and the absorption heat pump improves the efficiency and the operation flexibility of the coal-fired unit, and reduces pollutant emission and resource consumption, which is a long-term concern of coal-fired power plants.
Description
Technical Field
The invention belongs to the technical field of cogeneration, and particularly relates to a coal-fired unit coupling compressed air energy storage waste heat supply system and an operation method.
Background
The existing thermal power industry should follow the principle of ' adhering to low carbon, cleaning and high efficiency ', developing green thermal power greatly ', and encourages development and application of ' high efficiency clean power generation ' and other advanced applicable technologies. The thermal power technology progress is changed from the modes of improving initial parameters, steam reheating and the like to the directions of full-working-condition operation, waste heat deep utilization and the like. Meanwhile, central heating is being carried out in northern areas, and the emission of pollutants of small-sized heating boilers is reduced, so that the environmental problem of frequent haze in northern areas in winter is solved. Therefore, the thermal power generating unit performs cogeneration, which has important significance for energy conservation and emission reduction.
At present, the heat and power cogeneration unit mostly adopts a suction condensing turbine, a back pressure turbine or a condenser turbine to improve back pressure operation under a heat supply working condition, because the return water temperature of a heat supply network is more than 40 ℃, the water supply temperature of the heat supply network is more than 70-120 ℃, the suction temperature of the turbine of the suction condensing unit is higher, the suction condensing unit is directly used for heating the heat supply network water and has larger irreversible loss, the back pressure turbine or the condenser turbine can utilize the exhaust steam of the turbine to heat the heat supply network water when improving back pressure operation, the cold end loss can be reasonably utilized, but the high back pressure heat supply unit mostly operates in a heat and power supply mode, the electric load range is smaller, and the flexible operation of the unit is difficult to realize.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a coal-fired unit coupling compressed air energy storage waste heat heating system and an operation method thereof, so as to solve the problems that in the prior art, a high back pressure heat supply unit is operated in a thermoelectric mode, the electric load range is small, and flexible operation of the unit is difficult to realize.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the system is characterized by comprising a first turbine unit, a second turbine unit, an absorption heat pump, a small turbine exhaust steam heater and a second turbine unit heat supply condenser;
the heat supply network backwater is communicated with a cold side working medium inlet of the second unit heat supply condenser, a cold side working medium outlet of the second unit heat supply condenser is communicated with a pipeline, the pipeline is provided with two branches, one branch is communicated with a heated working medium inlet of the absorption heat pump, and the other branch is communicated with a cold side working medium inlet of the small steam turbine exhaust steam heater; the heated working medium outlet of the absorption heat pump and the cold side working medium outlet of the exhaust steam heater of the small steam turbine are converged and then communicated to a heat supply network;
the heat supply condenser of the second unit takes the exhaust steam of the second turbine unit as a heat source, the absorption heat pump takes the exhaust steam of the first turbine unit as a heat source and drives steam, the hot side working medium inlet of the exhaust steam heater of the small turbine is communicated with the small turbine of the heat supply network circulating water pump, and the small turbine of the heat supply network circulating water pump takes the exhaust steam of the first turbine unit as the drive steam;
a branch is arranged on a communication pipeline between the return water of the heat supply network and the cold side working medium inlet of the second unit heat supply condenser, the branch is communicated to the cold side working medium inlet of the air cooler, and the cold side working medium outlet of the air cooler is converged into the pipeline; the hot side working medium inlet of the air cooler is communicated with an air compressor, and the hot side working medium outlet of the air cooler is communicated with a compressed air energy storage device.
The invention further improves that:
preferably, the first turbine unit comprises a first unit medium-pressure turbine and a first unit low-pressure turbine, and exhaust steam of the first unit medium-pressure turbine unit is respectively communicated with a first unit turbine low-pressure turbine inlet, a heat supply network circulating water pump small turbine inlet and an absorption heat pump driving steam inlet.
Preferably, the exhaust steam of the low-pressure turbine of the first unit is communicated with the cold source inlet of the absorption heat pump, and the cold source outlet of the absorption heat pump is communicated to the condenser hot well of the first adding unit.
Preferably, the second unit comprises a second unit medium pressure turbine and a second unit low pressure turbine, the exhaust steam inlet of the second unit medium pressure turbine is communicated with the steam inlet of the second unit low pressure turbine, and the exhaust steam of the second unit low pressure turbine is communicated with the heat source inlet of the second unit heat supply condenser.
Preferably, a heat supply network circulating water pump is arranged on a heat supply network backwater pipeline, and the power input end of the heat supply network circulating water pump is connected with the power output end of a small steam turbine of the heat supply network circulating water pump; and an outlet control valve is arranged on a branch on a cold side working medium inlet communication pipeline of the heat supply network backwater and the second unit heat supply condenser.
Preferably, the power output shaft of the first turbine unit is connected with a first unit generator, the power output shaft of the second turbine unit is connected with a second unit generator, and the second unit generator supplies power for the compressed air energy storage device.
Preferably, the hot side working medium outlet of the air cooler is communicated with a refrigeration expander, the outlet of the refrigeration expander is communicated with a gas-liquid separator, and the liquid outlet of the gas-liquid separator is connected with an air storage tank.
Preferably, an outlet of the air storage tank is connected with a booster pump, an outlet of the booster pump is connected with a combustion chamber, an outlet of the combustion chamber is connected with an air expander, and a power output end of the air expander is connected with an air generator.
Preferably, the gas outlet of the gas-liquid separation device is communicated with the inlet of the air compressor.
According to the operation method of the coal-fired unit coupled compressed air energy storage waste heat supply system, when the compressed air energy storage system operates in an energy storage mode, one part of return water of the heat supply network is shunted and passes through the air cooler, the other part of return water is heated by waste heat of compressed air, and the other part of return water is heated by the second unit heat supply condenser and is collected at an outlet of the heat supply condenser; then split into two parts, wherein one part is used as a heated working medium and is heated by an absorption heat pump, the other part is heated by a small steam turbine exhaust steam heater, and water heated by the absorption heat pump and water heated by the small steam turbine exhaust steam heater are converged and then introduced into a heat supply network; the first turbine unit outputs electric energy to the outside, and air is stored in a compressed air energy storage device in a liquid form;
when the compressed air energy storage system operates in the energy release mode, the compressed air energy storage device provides electric energy to the outside.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a coal-fired unit coupling compressed air energy storage waste heat heating system, which combines a coal-fired heating unit, a compressed air energy storage system and an absorption heat pump, so that water supply of a heat supply network can be heated by air waste heat and waste heat of the coal-fired unit. The turbine generator set adopts Rankine cycle as power cycle, the absorption heat pump is coupled, the cold end waste heat of the coal-fired unit is utilized, two energy sources of heat and electricity are provided for users at the same time, the energy release and generation mode of the compressed air energy storage system adopts Brayton cycle as power cycle, and electric energy is output to the outside. Through the coupling optimization of the compressed air energy storage-cold end-absorption heat pump, the energy utilization rate of the coal-fired unit can be greatly improved. The cold end waste heat heating system of the coal-fired unit coupled with the compressed air energy storage and the absorption heat pump improves the efficiency and the operation flexibility of the coal-fired unit, and reduces pollutant emission and resource consumption, which is a long-term concern of coal-fired power plants.
Furthermore, the invention adopts the air cooler and the exhaust steam of the high back pressure unit to heat the heat supply network backwater in turn under the energy storage mode of the compressed air energy storage system, and then uses the exhaust steam of the extraction condensing unit as an absorption heat pump cold source, thereby reasonably utilizing the cold end waste heat, improving the energy utilization rate and obviously reducing the comprehensive power generation coal consumption rate of the unit.
Furthermore, the invention adopts the steam turbine to extract steam to drive the heat supply network circulating water pump, and uses the exhaust steam of the small steam turbine to heat the heat supply network water, thereby reasonably utilizing the pressure and heat of the steam turbine to extract steam, realizing the cascade utilization of energy and reducing the power generation coal consumption rate of the unit.
Furthermore, the invention can realize thermal decoupling through adjusting the energy storage mode and the energy release power generation mode of the compressed air energy storage system, so that the first unit and the second unit can meet the requirement of flexible peak shaving.
The invention also discloses an operation method of the coal-fired unit coupling compressed air energy storage waste heat heating system, which divides the heating process of the heat supply network backwater into 2 stages: when the compressed air energy storage system operates in an energy storage mode, the heat supply network backwater firstly passes through the air cooler and the heat supply condenser, and is heated by utilizing the air waste heat and the exhaust steam latent heat of the steam turbine respectively, and then is split into two parts after being collected, wherein one part is heated by the absorption heat pump as a heated working medium, and the other part utilizes the exhaust steam waste heat by the exhaust steam heater of the small steam turbine, so that the heat supply requirement is met. The system reasonably distributes heating sources at different stages, reasonably utilizes the waste heat of the system, and has higher energy utilization rate of the unit; under the working condition that the high back pressure steam turbine generator unit stably operates, the compressed air system adjusts the electric load of the unit by adjusting the compressed energy storage mode or the energy release power generation mode, so that the flexible peak shaving requirement under the condition that a single unit is independently allocated is met.
Drawings
FIG. 1 is a system block diagram of the present invention;
in the figure: 1 is a first unit high-pressure turbine, 2 is a first unit low-pressure turbine, 3 is a heat supply network circulating water pump small turbine, 4 is a heat supply network circulating water pump, 5 is a second unit heat supply condenser 6 is a small turbine exhaust steam heater, 7 is an absorption heat pump, 8 is a first unit medium pressure turbine, 9 is a second unit low pressure turbine, 10 is a second unit generator the system comprises a first unit generator 11, an outlet control valve 12, a second unit high-pressure turbine 13, a second unit medium-pressure turbine 14, a refrigeration expander 15, an air cooler 16, an air compressor 17, a gas-liquid separation device 18, an air storage tank 19, a booster pump 20, a combustion chamber 21, an air expander 22 and an air generator 23; 24 is a pipe.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
in the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in the specific direction, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, the invention discloses a cold end waste heat heating system of a coal-fired unit coupled compressed air energy storage and absorption heat pump, which comprises an air compressor 17, an air cooler 16, a refrigeration expander 15, a gas-liquid separation device 18, an air storage tank 19, a booster pump 20, a combustion chamber 21 and an air expander 22 which are sequentially communicated; the system also comprises a first unit high-pressure turbine 1, a first unit medium-pressure turbine 8, a first unit low-pressure turbine 2, a heat supply network circulating water pump small turbine 3, a heat supply network circulating water pump 4, a second unit heat supply condenser 5, an absorption heat pump 7, a second unit high-pressure turbine 13, a second unit medium-pressure turbine 14, a second unit low-pressure turbine 9, a second unit generator 10, a first unit generator 11, a control valve 12 and an air generator 23.
The exhaust steam of the medium-pressure turbine 8 of the first unit is respectively communicated with the inlet of the low-pressure turbine 2 of the first unit, the inlet of the small turbine 3 of the heat supply network circulating water pump and the driving steam inlet of the absorption heat pump 7; part of the exhaust steam of the low-pressure turbine 2 of the first unit enters a cold source inlet of the absorption heat pump 7, and the rest part enters a condenser hot well of the first unit. The first unit high-pressure turbine 1, the first unit medium-pressure turbine 8 and the first unit low-pressure turbine 2 jointly drive a power output shaft, and the power output shaft drives a first unit generator 11 to generate electricity.
The inlet of the second unit low pressure turbine 9 is communicated with the outlet of the second unit medium pressure turbine 14, the steam exhaust outlet of the second unit low pressure turbine 9 is communicated with the hot side working medium inlet of the second unit heat supply condenser 5, and the second unit high pressure turbine 13, the second unit medium pressure turbine 14 and the second unit low pressure turbine 9 jointly drive a power output shaft which drives the second unit generator 10 to generate electricity.
The inlet of the heat supply network circulating water pump 4 is communicated with heat supply network backwater, the outlet of the heat supply network circulating water pump 4 is divided into two branches, one branch is communicated with the inlet of the control valve 12, the other branch is communicated with the cold side working medium inlet of the second unit heat supply condenser 5, the power of the heat supply network circulating water pump 4 is provided by the heat supply network circulating water pump small turbine 3, the heat supply network circulating water pump small turbine 3 drives steam to be discharged from the first unit medium-pressure steam turbine 8, the steam enters the hot side working medium inlet of the small turbine exhaust steam heater 6 after being driven to do work, and the heat is released and then is collected into the first unit condenser heat well. The outlet of the control valve 12 communicates with the cold side working fluid inlet of the air cooler 16.
The hot side working medium outlet of the second unit heat supply condenser 5 is communicated with a hot well of the second unit condenser, one branch of the cold side working medium inlet heat network circulating water pump 4 is communicated, the cold side working medium outlet is communicated with a pipeline 24, the inlet of the pipeline 24 is the cold side working medium outlet of the second unit heat supply condenser 5, and the outlet of the pipeline 24 is communicated with the heated working medium inlet of the absorption heat pump 7. The pipeline 24 is converged with water flow flowing out of the cold side working medium outlet of the air cooler 16, and the pipeline 24 is provided with a branch after converging into the water flow, and the branch is communicated with the cold side working medium inlet of the exhaust steam heater 6 of the small steam turbine.
The working medium of the absorption heat pump 7 is lithium bromide solution, the cold source inlet of the absorption heat pump 7 is communicated with the exhaust gas phase of the low-pressure turbine 2 of the first unit, and the outlet of the cold source working medium is converged into the condenser hot well of the first unit; the absorption heat pump 7 drives steam to be discharged from a medium-pressure steam turbine of the first unit, and the steam is driven to work and then is gathered into a condenser hot well of the first unit; the inlet of the heated working medium of the absorption heat pump 7 is communicated with the outlet of the working medium on the cold side of the second unit heat supply condenser 5, the outlet of the working medium on the cold side of the second unit heat supply condenser 5 is communicated with the inlet of the working medium on the cold side of the exhaust steam heater 6 of the small steam turbine, and the outlet of the heated working medium of the absorption heat pump 7 is converged with the outlet of the working medium on the cold side of the exhaust steam heater 6 of the small steam turbine and is commonly introduced into a heat supply network for water supply.
The cold side working medium inlet of the small steam turbine exhaust steam heater 6 is communicated with the branch of the pipeline 24, the cold side working medium outlet is converged to the heated working medium outlet of the absorption heat pump 7, the hot side working medium inlet of the small steam turbine exhaust steam heater 6 is steam of the heat network circulating water pump small steam turbine 3, and the hot side working medium outlet is communicated to a first unit condenser heat well.
The air compressor 17 is driven by the second unit generator 10, an inlet of the air compressor 17 is communicated with a gas outlet of the air-gas-liquid separation device 18, and an outlet of the air compressor 17 is communicated with a hot side working medium inlet of the air cooler 16.
The hot side working medium outlet of the air cooler 16 is communicated with the inlet of the refrigeration expander 15, the cold side working medium inlet of the air cooler 16 is communicated with the heat supply network backwater and the heat supply network water, and the cold side working medium outlet of the air cooler 16 is communicated with the heated working medium inlet of the absorption heat pump 13.
The inlet of the gas-liquid separation device 18 is communicated with the outlet of the refrigeration expander 15, and the liquid outlet of the gas-liquid separation device 18 is communicated with the inlet of the air storage tank 19.
The inlet of the booster pump 20 is communicated with the outlet of the air storage tank 19, and the outlet of the booster pump 20 is communicated with the inlet of the combustion chamber 21;
after the fuel is combusted in the combustion chamber 21, the fuel enters the air expander 22 to do work, and the air generator 23 is driven to output electric energy.
The working process of the heat supply network part is as follows:
the heat supply network backwater is firstly subjected to a supercharging process through a heat supply network circulating water pump 4, when the compressed air energy storage system is operated in an energy storage mode, one part of the heat supply network backwater is shunted and is heated through an air cooler 16 by utilizing the waste heat of compressed air, the other part of the heat supply network backwater is heated through a second unit heat supply condenser 5, is collected at an outlet of the heat supply condenser 5, and is then shunted into two parts, one part of the heat supply network backwater is heated through an absorption heat pump 7 as a heated working medium, and the other part of the heat supply network backwater is heated through a small steam turbine exhaust steam heater 6, so that the whole flow of heat supply network water supply heating is completed; the first unit high-pressure turbine 1, the first unit medium-pressure turbine 8 and the first unit low-pressure turbine 2 drive the first unit generator 11 to output electric energy outwards, the second unit high-pressure turbine 13, the second unit medium-pressure turbine 14 and the second unit low-pressure turbine 9 drive the second unit generator 10 to output electric energy outwards, and the air expander 22 drives the air generator 23 to output electric energy outwards.
The working process of the compressed air energy storage system is as follows:
when the compressed air energy storage system operates in an energy storage mode, air firstly enters an air compressor 17 to be pressurized, then enters an air cooler 16 to release heat, then enters a refrigeration expander 15 to be expanded to storage pressure, finally, gaseous air and liquid air are separated in a gas-liquid separation device 18, the liquid air is stored in an air storage tank 19, and the separated gaseous air is returned to an inlet of the air compressor 17 to be recompressed, so that the air compression energy storage process of the compressed air energy storage system is completed; when the compressed air energy storage system operates in an energy release and power generation mode, liquid air at the outlet of the air storage tank 19 is pressurized by the booster pump 20 and then enters the combustion chamber 21 for combustion and heating, and then enters the air expander 22 for expansion and working, so as to drive the air generator 23 to generate power, and the power generation and energy release process of the liquid compressed air energy storage system is completed; the heat supply network backwater is pressurized by 0.4-0.6MPa through a heat supply network circulating water pump 4, then enters an air cooler 16 and a second unit heat supply condenser 5 to be heated to 60-70 ℃, is split into two parts, wherein one part is heated to 85-90 ℃ through an absorption heat pump 7, the other part is heated through a small steam turbine exhaust steam heater 6, and is converged and then enters a heat supply network water supply pipeline, so that the split flow entering the small steam turbine exhaust steam heater 6 can be adjusted to ensure that the heat supply network water supply temperature is between 85-105 ℃, and the temperature requirements of different heat supply periods are met; the first unit is a steam extraction heat supply unit, the electric load adjusting capability is strong, the electric load adjusting capability of the second unit high back pressure heat supply unit is improved through the coupling of the compressed air energy storage system, and the thermoelectric decoupling is realized, so that the first unit and the second unit can meet the requirements of flexible peak shaving.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. The coal-fired unit coupling compressed air energy storage waste heat heating system is characterized by comprising a first turbine unit, a second turbine unit, an absorption heat pump (7), a small turbine exhaust steam heater (6) and a second turbine unit heat supply condenser (5);
the heat supply network backwater is communicated with a cold side working medium inlet of a second unit heat supply condenser (5), a cold side working medium outlet of the second unit heat supply condenser (5) is communicated with a pipeline (24), the pipeline (24) is provided with two branches, one branch is communicated with a heated working medium inlet of an absorption heat pump (7), and the other branch is communicated with a cold side working medium inlet of a small steam turbine exhaust steam heater (6); the heated working medium outlet of the absorption heat pump (7) and the cold side working medium outlet of the small steam turbine exhaust steam heater (6) are converged and then communicated to a heat supply network;
the second unit heating condenser (5) takes exhaust steam of a second turbine unit as a heat source, the absorption heat pump (7) takes exhaust steam of a first turbine unit as a heat source and driving steam, a hot side working medium inlet of the small turbine exhaust steam heater (6) is communicated to the heat supply network circulating water pump small turbine (3), and the heat supply network circulating water pump small turbine (3) takes exhaust steam of the first turbine unit as driving steam;
a branch is arranged on a communication pipeline between the return water of the heat supply network and the cold side working medium inlet of the second unit heat supply condenser (5), the branch is communicated to the cold side working medium inlet of the air cooler (16), and the cold side working medium outlet of the air cooler (16) is converged into the pipeline (24); the hot side working medium inlet of the air cooler (16) is communicated with an air compressor (17), and the hot side working medium outlet of the air cooler (16) is communicated with a compressed air energy storage device;
the first turbine unit comprises a first unit medium pressure turbine (8) and a first unit low pressure turbine (2), and exhaust steam of the first unit medium pressure turbine (8) is respectively communicated with an inlet of the first unit low pressure turbine (2), an inlet of a small heat pump turbine (3) of a heat supply network circulating water pump and a driving steam inlet of an absorption heat pump (7);
the exhaust steam of the low-pressure turbine (2) of the first unit is communicated with the cold source inlet of the absorption heat pump (7), and the cold source outlet of the absorption heat pump (7) is communicated to the condenser hot well of the first unit;
the second unit comprises a second unit medium pressure turbine (14) and a second unit low pressure turbine (9), the exhaust steam inlet of the second unit medium pressure turbine (14) is communicated with the steam inlet of the second unit low pressure turbine (9), and the exhaust steam of the second unit low pressure turbine (9) is communicated with the heat source inlet of the second unit heat supply condenser (5);
a heat supply network circulating water pump (4) is arranged on a heat supply network backwater pipeline, and the power input end of the heat supply network circulating water pump (4) is connected with the power output end of the heat supply network circulating water pump small turbine (3); an outlet control valve (12) is arranged on a branch on a cold side working medium inlet communication pipeline of the heat supply network backwater and second unit heat supply condenser (5);
the power output shaft of the first turbine unit is connected with a first unit generator (11), the power output shaft of the second turbine unit is connected with a second unit generator (10), and the second unit generator (10) supplies power for the compressed air energy storage device;
the first unit is a steam extraction heat supply unit, and the second unit is a high back pressure heat supply unit.
2. The coal-fired unit coupling compressed air energy storage waste heat heating system according to claim 1, wherein a refrigerating expander (15) is communicated with a hot side working medium outlet of the air cooler (16), a gas-liquid separation device (18) is communicated with an outlet of the refrigerating expander (15), and a liquid outlet of the gas-liquid separation device (18) is connected with an air storage tank (19).
3. The coupling compressed air energy storage and waste heat heating system of the coal-fired unit according to claim 2, wherein an outlet of the air storage tank (19) is connected with a booster pump (20), an outlet of the booster pump (20) is connected with a combustion chamber (21), an outlet of the combustion chamber (21) is connected with an air expander (22), and a power output end of the air expander (22) is connected with an air generator (23).
4. The coal-fired unit coupled compressed air energy storage and waste heat heating system according to claim 2, wherein a gas outlet of the gas-liquid separation device (18) is communicated with an inlet of the air compressor (17).
5. An operation method of the coal-fired unit coupled compressed air energy storage waste heat heating system is characterized in that when the compressed air energy storage system operates in an energy storage mode, part of return water of a heat supply network is shunted to pass through an air cooler (16), is heated by waste heat of compressed air, and the other part of return water is heated by a second unit heat supply condenser (5) and is collected at an outlet of the second unit heat supply condenser (5); then split into two parts, wherein one part is used as a heated working medium and is heated by an absorption heat pump (7), the other part is heated by a small steam turbine exhaust steam heater (6), and water heated by the absorption heat pump (7) and water heated by the small steam turbine exhaust steam heater (6) are converged and then introduced into a heat supply network; the first turbine unit outputs electric energy to the outside, and air is stored in a compressed air energy storage device in a liquid form;
when the compressed air energy storage system operates in the energy release mode, the compressed air energy storage device provides electric energy to the outside.
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