CN115095899A - Coal-fired unit coupling compressed air energy storage waste heat supply system and operation method - Google Patents
Coal-fired unit coupling compressed air energy storage waste heat supply system and operation method Download PDFInfo
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- CN115095899A CN115095899A CN202210760735.9A CN202210760735A CN115095899A CN 115095899 A CN115095899 A CN 115095899A CN 202210760735 A CN202210760735 A CN 202210760735A CN 115095899 A CN115095899 A CN 115095899A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 54
- 239000002918 waste heat Substances 0.000 title claims abstract description 33
- 230000008878 coupling Effects 0.000 title claims abstract description 15
- 238000010168 coupling process Methods 0.000 title claims abstract description 15
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 15
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 59
- 239000007788 liquid Substances 0.000 claims description 21
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 238000005057 refrigeration Methods 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 6
- 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
- 230000008569 process Effects 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 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
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 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
- 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
- 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]
Abstract
The invention discloses a coal-fired unit coupling compressed air energy storage waste heat heating system and an operation method thereof. The steam turbine generator unit adopts Rankine cycle as power cycle, the coupling absorption heat pump is used for providing heat and electricity for users by using waste heat at the cold end of the coal-fired unit, and the energy-releasing power generation mode of the compressed air energy storage system adopts Brayton cycle as power cycle to output electric energy externally. By coupling optimization of compressed air energy storage-cold end-absorption heat pump, the invention can greatly improve the energy utilization rate of the coal-fired unit. The cold-end waste heat supply system of the coal-fired unit coupled compressed air energy storage and absorption heat pump provided by the invention improves the efficiency and the operation flexibility of the coal-fired unit, and reduces the pollutant emission and the resource consumption, which are long-term concerns of a coal-fired power station.
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 heating system and an operation method.
Background
The existing thermal power industry follows the principle of 'insisting on low carbon, cleanness and high efficiency and vigorously developing green thermal power', and encourages the development and application of advanced applicable technologies such as 'high-efficiency clean power generation'. The thermal power technology is changed from the mode of improving initial parameters, reheating steam and the like to the direction of full-working-condition operation, deep utilization of waste heat and the like. Meanwhile, central heating is being developed in the northern area, and the emission of pollutants of small-sized heating boilers is reduced, so that the environmental problem that haze is frequent in the northern area in winter is solved. Therefore, the cogeneration of the heat and the power of the thermal power generating unit has important significance on the energy saving and emission reduction work.
At present, most of cogeneration units adopt a condensing turbine, a back pressure turbine or a condenser turbine to improve back pressure operation under a heat supply working condition, the back water temperature of a heat supply network is above 40 ℃, the water supply temperature of the heat supply network is above 70-120 ℃, the air exhaust temperature of the steam turbine of the condensing unit is higher, the steam turbine is directly used for heating heat supply network water and has larger irreversible loss, when the back pressure turbine or the condenser turbine improves back pressure operation, steam exhaust of the steam turbine can be used for heating the heat supply network water, cold end loss can be reasonably utilized, however, high back pressure heat supply units mostly operate according to a heat and power fixing mode, the electric load range is smaller, and flexible operation of the units is difficult to realize.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a coal-fired unit coupled 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 heating unit mostly operates 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 adopts the following technical scheme to realize the purpose:
a 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, a small steam turbine exhaust steam heater and a second unit heat supply condenser;
the return water of the heat supply network is communicated with a cold side working medium inlet of a 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; a heated working medium outlet of the absorption heat pump and a cold side working medium outlet of the small steam turbine exhaust steam heater 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 driving steam, a hot side working medium inlet of the exhaust steam heater of the small steam turbine is communicated to a small steam turbine of a heat supply network circulating water pump, and the small steam turbine of the heat supply network circulating water pump takes the exhaust steam of the first turbine unit as driving steam;
a branch is arranged on a pipeline for communicating the return water of the heat supply network with a cold side working medium inlet of the heat supply condenser of the second unit, the branch is communicated to the cold side working medium inlet of the air cooler, and a cold side working medium outlet of the air cooler is converged into the pipeline; and a hot side working medium inlet of the air cooler is communicated with an air compressor, and a hot side working medium outlet of the air cooler is communicated with a compressed air energy storage device.
The invention is further improved in 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 communicated with a first unit turbine low-pressure turbine inlet, a heat network circulating water pump small turbine inlet and an absorption heat pump driving steam inlet respectively.
Preferably, the exhaust steam of the low-pressure turbine of the first unit is communicated with a cold source inlet of the absorption heat pump, and a cold source outlet of the absorption heat pump is communicated to a condenser hot well of the first heating unit.
Preferably, the second unit comprises a second unit medium-pressure turbine and a second unit low-pressure turbine, an exhaust steam inlet of the second unit medium-pressure turbine is communicated with a steam inlet of the second unit low-pressure turbine, and an exhaust steam of the second unit low-pressure turbine is communicated with a heat source inlet of the second unit heat supply condenser.
Preferably, a pipeline for returning water of the heat supply network is provided with a heat supply network circulating water pump, and a power input end of the heat supply network circulating water pump is connected with a power output end of a small turbine of the heat supply network circulating water pump; and an outlet control valve is arranged on a branch of a cold-side working medium inlet communicating pipeline of the heat supply network return water and the second unit heat supply condenser.
Preferably, the power output shaft of the first turbine set is connected with a first set generator, the power output shaft of the second turbine set is connected with a second set generator, and the second set generator supplies power for the compressed air energy storage device.
Preferably, a working medium outlet at the hot side of the air cooler is communicated with a refrigeration expander, an outlet of the refrigeration expander is communicated with a gas-liquid separator, and a 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.
When the compressed air energy storage system operates in an energy storage mode, one part of return water of a heat supply network is shunted and passes through an air cooler, and is heated by the waste heat of compressed air, and the other part of the return water is heated by a heat supply condenser of a second unit and is collected at an outlet of the heat supply condenser; then the working medium is divided into two parts, 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 set outputs electric energy to the outside, and air is stored in the compressed air energy storage device in a liquid state;
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 heat supply unit, a compressed air energy storage system and an absorption heat pump, so that the water supply of a heat supply network can be heated by the waste heat of air and the waste heat of the coal-fired unit. The steam turbine generator unit adopts Rankine cycle as power cycle, the coupling absorption heat pump is used for providing two energy sources of heat and electricity for users by using waste heat at the cold end of the coal-fired unit, and the Brayton cycle is adopted as the power cycle in the energy releasing and generating mode of the compressed air energy storage system to output electric energy to the outside. By coupling optimization of the compressed air energy storage-cold end-absorption heat pump, the invention can greatly improve the energy utilization rate of the coal-fired unit. The cold-end waste heat supply system of the coal-fired unit coupled compressed air energy storage and absorption heat pump provided by the invention improves the efficiency and the operation flexibility of the coal-fired unit, and reduces the pollutant emission and the resource consumption, which are long-term concerns of a coal-fired power station.
Furthermore, the air cooler and the exhaust steam of the high-back-pressure unit sequentially heat the backwater of the heat supply network in an energy storage mode of the compressed air energy storage system, and then the exhaust steam of the extraction and condensation unit is used as a cold source of the absorption heat pump, so that the waste heat of the cold end is reasonably utilized, the energy utilization rate is improved, and the comprehensive power generation coal consumption rate of the unit can be obviously reduced.
Furthermore, the invention adopts the steam extraction of the steam turbine to drive the heat supply network circulating water pump, uses the exhaust steam of the small steam turbine to heat the water of the heat supply network, reasonably utilizes the pressure and heat of the steam extraction of the steam turbine, realizes the gradient utilization of energy and can reduce the power generation coal consumption rate of the unit.
Furthermore, the thermoelectric decoupling can be realized by 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 both meet the requirement of flexible peak regulation.
The invention also discloses an operation method of the coal-fired unit coupled compressed air energy storage waste heat heating system, which divides the return water heating process of a heat supply network into 2 stages: when the compressed air energy storage system operates in an energy storage mode, return water of a heat supply network firstly passes through the air cooler and the heat supply condenser, is heated by utilizing air waste heat and steam exhaust latent heat of the steam turbine respectively, and is divided into two parts after being collected, one part is used as a heated working medium and is heated by the absorption heat pump, and the other part utilizes the steam exhaust waste heat through the steam exhaust heater of the small steam turbine, so that the heat supply requirement is met. The system reasonably distributes heating heat 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-backpressure steam turbine generator unit stably operates, the compressed air system adjusts the electrical load of the unit by adjusting a compression energy storage mode or an energy release power generation mode, and the flexible peak regulation requirement under the condition that a single unit is independently allocated is met.
Drawings
FIG. 1 is a block diagram of the system 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, 11 is a first unit generator, 12 is an outlet control valve, 13 is a second unit high-pressure turbine, 14 is a second unit medium-pressure turbine, 15 is a refrigeration expander, 16 is an air cooler, 17 is an air compressor, 18 is a gas-liquid separation device, 19 is an air storage tank, 20 is a booster pump, 21 is a combustion chamber, 22 is an air expander, and 23 is an air generator; and 24 is a pipeline.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
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; 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 expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; 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.
Referring to fig. 1, the invention discloses a cold-end waste heat supply 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 circulating water pump of the heat supply network and the driving steam inlet of the absorption heat pump 7; one part of the exhaust steam of the first unit low-pressure turbine 2 enters the cold source inlet of the absorption heat pump 7, and the other part of the exhaust steam enters the first unit condenser hot well. The first unit high pressure turbine 1, the first unit medium pressure turbine 8 and the first unit low pressure turbine 2 drive a power output shaft together, and the power output shaft drives the first unit generator 11 to generate electricity.
An inlet of the second unit low-pressure turbine 9 is communicated with an outlet of the second unit medium-pressure turbine 14, an exhaust outlet of the second unit low-pressure turbine 9 is communicated with a working medium inlet at the hot side of the second unit heat supply condenser 5, the second unit high-pressure turbine 13, the second unit medium-pressure turbine 14 and the second unit low-pressure turbine 9 drive a power output shaft together, and the power output shaft drives the second unit generator 10 to generate electricity.
An inlet of a heat supply network circulating water pump 4 is communicated with heat supply network backwater, an outlet of the heat supply network circulating water pump 4 is divided into two branches, one branch is communicated with an inlet of a control valve 12, the other branch is communicated with a cold side working medium inlet of a heat supply condenser 5 of a second unit, power of the heat supply network circulating water pump 4 is provided by a small steam turbine 3 of the heat supply network circulating water pump, the small steam turbine 3 of the heat supply network circulating water pump drives steam to come from a medium-pressure steam turbine 8 of the first unit for steam exhaust, the driven steam enters a hot side working medium inlet of a steam exhaust heater 6 of the small steam turbine after acting, and the heat is released and then flows into a hot well of the condenser of the first unit. The outlet of the control valve 12 communicates with the cold side working fluid inlet of the air cooler 16.
A working medium outlet at the hot side of the second unit heat supply condenser 5 is communicated with a hot well of the second unit condenser, a branch of the cold side working medium inlet heat supply network circulating water pump 4 is communicated, the cold side working medium outlet is communicated with a pipeline 24, an inlet of the pipeline 24 is the cold side working medium outlet of the second unit heat supply condenser 5, and an outlet of the pipeline 24 is communicated with a heated working medium inlet of the absorption heat pump 7. The pipeline 24 is converged into a water flow flowing out of a cold side working medium outlet of the air cooler 16, and a branch is arranged after the pipeline 24 is converged into the water flow and is communicated with a cold side working medium inlet of the steam exhaust 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 steam of the first unit low-pressure turbine 2, and the cold source working medium outlet is converged into the first unit condenser hot well; the absorption heat pump 7 drives steam to come from a medium-pressure turbine of the first unit for steam exhaust, and the steam is driven to do work and then flows into a condenser hot well of the first unit; the heated working medium inlet of the absorption heat pump 7 is communicated with the cold side working medium outlet of the second unit heat supply condenser 5, the cold side working medium outlet of the second unit heat supply condenser 5 is communicated with the cold side working medium inlet of the small steam turbine exhaust steam heater 6, and the heated working medium outlet of the absorption heat pump 7 is converged with the cold side working medium outlet of the small steam turbine exhaust steam heater 6 and is jointly introduced into a heat supply network for water supply.
A cold side working medium inlet of the small steam turbine exhaust steam heater 6 is communicated with a branch of the pipeline 24, a cold side working medium outlet is converged to a heated working medium outlet of the absorption heat pump 7, a hot side working medium inlet of the small steam turbine exhaust steam heater 6 is steam of the small steam turbine 3 of the heat supply network circulating water pump, and a hot side working medium outlet is communicated to a first unit condenser hot well.
The air compressor 17 is driven by the second unit generator 10, the inlet of the air compressor 17 is communicated with the air outlet of the atmosphere and air-liquid separation device 18, and the outlet of the air compressor 17 is communicated with the working medium inlet at the hot side of the air cooler 16.
The working medium outlet at the hot side of the air cooler 16 is communicated with the inlet of the refrigeration expansion machine 15, the working medium inlet at the cold side of the air cooler 16 is communicated with the return water of the heat supply network and the water supplement of the heat supply network, and the working medium outlet at the cold side 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 expansion machine 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 supplementary fuel in the combustion chamber 21 is combusted, the supplementary fuel enters the air expander 22 to do work, and the air generator 23 is driven to output electric energy outwards.
The working process of the heat supply network part is as follows:
the method comprises the following steps that the heat supply network backwater firstly passes through a heat supply network circulating water pump 4 to complete a pressurization process, when a compressed air energy storage system operates in an energy storage mode, one part of the heat supply network backwater is divided into two parts, one part of the heat supply network backwater passes through an air cooler 16 and is heated by using the waste heat of compressed air, the other part of the heat supply network backwater is heated by a second unit heat supply condenser 5 and is collected at an outlet of the heat supply condenser 5, then the divided parts are divided into two parts, one part of the heat supply network backwater is used as a heated working medium and is heated by an absorption heat pump 7, and the other part of the heat supply network backwater is heated by a small steam turbine exhaust steam heater 6 to complete the whole flow of water supply heating of the heat supply network; 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 for pressurization, then enters an air cooler 16 for heat release, then enters a refrigeration expander 15 for expansion to storage pressure, and 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 returns to an inlet of the air compressor 17 for recompression, so that the air compression and energy storage process of the compressed air energy storage system is completed; when the compressed air energy storage system operates in an energy-releasing and power-generating 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 temperature rise, and then enters the air expander 22 for expansion and work application to drive the air generator 23 to generate power, so that the power-generating and energy-releasing process of the liquid compressed air energy storage system is completed; the return water of the heat supply network 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 ℃, and then is divided into two parts, 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 to a heat supply network water supply pipeline, and the flow dividing rate of the small steam turbine exhaust steam heater 6 can be adjusted to ensure that the water supply temperature of the heat supply network is between 85-105 ℃, so that the temperature requirements in different heat supply periods are met; the first unit is a steam extraction heat supply unit, the electric load adjusting capacity is high, the electric load adjusting capacity of the high back pressure heat supply unit of the second unit is improved through the coupling compressed air energy storage system, thermoelectric decoupling is achieved, and the first unit and the second unit can meet the requirement of flexible peak regulation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A 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 steam turbine exhaust steam heater (6) and a second unit heat supply condenser (5);
the return water of the heat supply network 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 the absorption heat pump (7), and the other branch is communicated with a cold side working medium inlet of the steam exhaust heater (6) of the small steam turbine; a heated working medium outlet of the absorption heat pump (7) and a 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 heat supply condenser (5) of the second unit takes the exhaust steam of the second turbine unit as a heat source, the absorption heat pump (7) takes the exhaust steam of the first turbine unit as a heat source and driving steam, a working medium inlet at the hot side of the small steam turbine exhaust steam heater (6) is communicated to the small steam turbine (3) of the heat supply network circulating water pump, and the exhaust steam of the first turbine unit is taken as the driving steam by the small steam turbine (3) of the heat supply network circulating water pump;
a branch is arranged on a pipeline communicated with a cold side working medium inlet of the heat supply network return water and the second unit heat supply condenser (5), the branch is communicated to a cold side working medium inlet of the air cooler (16), and a cold side working medium outlet of the air cooler (16) is converged into a pipeline (24); and a hot side working medium inlet of the air cooler (16) is communicated with an air compressor (17), and a hot side working medium outlet of the air cooler (16) is communicated with a compressed air energy storage device.
2. The coal-fired unit coupling compressed air energy storage waste heat supply system as claimed in claim 1, wherein 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 the first unit turbine low pressure turbine inlet (2), the heat supply network circulating water pump small turbine (3) inlet and the absorption heat pump (7) driving steam inlet.
3. The coal-fired unit coupled compressed air energy storage waste heat supply system as claimed in claim 2, wherein the exhaust steam of the first unit low-pressure turbine (2) is communicated with a cold source inlet of the absorption heat pump (7), and a cold source outlet of the absorption heat pump (7) is communicated to a condenser hot well of the first heating unit.
4. The system for supplying heat by storing energy and waste heat of compressed air coupled with a coal-fired unit as recited in claim 1, wherein the second unit comprises a second unit medium-pressure turbine (14) and a second unit low-pressure turbine (9), the steam exhaust 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 steam exhaust of the second unit low-pressure turbine (9) is communicated with the heat source inlet of the second unit heat supply condenser (5).
5. The coal-fired unit coupling compressed air energy storage waste heat supply system as claimed in claim 1, wherein a heat supply network circulating water pump (4) is arranged on a pipeline for heat supply network backwater, and a power input end of the heat supply network circulating water pump (4) is connected with a power output end of a small turbine (3) of the heat supply network circulating water pump; and an outlet control valve (12) is arranged on a branch of a cold-side working medium inlet communicating pipeline of the heat supply network return water and the second unit heat supply condenser (5).
6. The coal-fired unit coupled compressed air energy storage waste heat heating system as claimed in claim 1, wherein a power output shaft of the first turbine unit is connected with a first unit generator (11), a 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.
7. The coal-fired unit coupled compressed air energy storage waste heat supply system as claimed in any one of claims 1 to 6, wherein a working medium outlet at the hot side of the air cooler (16) is communicated with a refrigeration expander (15), an outlet of the refrigeration expander (15) is communicated with a gas-liquid separator (18), and a liquid outlet of the gas-liquid separator (18) is connected with an air storage tank (19).
8. The coal-fired unit coupling compressed air energy storage waste heat heating system as claimed in claim 7, 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).
9. The coal-fired unit coupled compressed air energy-storage waste heat heating system as claimed in claim 7, characterized in that a gas outlet of the gas-liquid separation device (18) is communicated with an inlet of the air compressor (17).
10. An operation method of the coal-fired unit coupled compressed air energy storage waste heat heating system according to claim 1, characterized in that when the compressed air energy storage system operates in an energy storage mode, one part of return water of a heat supply network is branched and passes through an air cooler (16) to be 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 heat supply condenser (5); then the working fluid is divided into two parts, one part is used as a heated working fluid 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 set outputs electric energy to the outside, and air is stored in the compressed air energy storage device in a liquid state;
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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