CN113202586B - Liquid air energy storage power generation system jointly operated with thermal power plant - Google Patents
Liquid air energy storage power generation system jointly operated with thermal power plant Download PDFInfo
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- CN113202586B CN113202586B CN202110644563.4A CN202110644563A CN113202586B CN 113202586 B CN113202586 B CN 113202586B CN 202110644563 A CN202110644563 A CN 202110644563A CN 113202586 B CN113202586 B CN 113202586B
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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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
-
- 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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/04—Using steam or condensate extracted or exhausted from steam engine plant for specific purposes other than heating
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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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/006—Accumulators and steam compressors
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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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/02—Use of accumulators and specific engine types; Control thereof
-
- 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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/14—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having both steam accumulator and heater, e.g. superheating accumulator
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- Engineering & Computer Science (AREA)
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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The embodiment of the invention provides a liquid air energy storage and power generation system which operates in combination with a thermal power plant. And the low-pressure steam in the thermal power unit is used for driving a power turbine set in the liquid air energy storage unit to rotate. The air cooling tower is respectively connected with an exhaust steam recovery module in the thermal power unit and a stage after-cooler in the liquid air energy storage unit to provide cold energy for the exhaust steam recovery module and the stage after-cooler. The system can realize deep peak shaving, simultaneously enables the thermal power unit to operate under a rated working condition, and can improve the operating efficiency of the thermal power plant. The steam is extracted from the low-voltage end stage in the thermal power unit to drive the power turboset so as to drive the air compressor set to operate, and the overall efficiency of the system is improved. The exhaust steam recovery module and the after-stage cooler can share the circulating cooling water of the air cooling tower, so that the facility investment cost of the liquid air energy storage unit is reduced.
Description
Technical Field
The invention relates to the technical field of liquid air energy storage, in particular to a liquid air energy storage power generation system which operates in combination with a thermal power plant.
Background
The conventional thermal power generating unit mainly adjusts the generating power by changing the steam inlet parameters of the steam turbine unit. The steam turbine unit has great change range of steam inlet parameters, and this will affect the utilization of boiler coal and the safety and service life of the steam turbine unit obviously. Meanwhile, due to the hysteresis of changing parameters of the coal-fired boiler, peak shaving response is not timely.
Liquid air energy storage is a clean, low-carbon, safe and long-life large-scale long-time energy storage technology. The electric energy can be converted into liquid air to be stored in the electricity consumption valley period; during peak period of electricity utilization, the stored liquid air is utilized to generate electricity. However, the circulation efficiency of the independent liquid air energy storage power station is low, and the initial equipment investment is large.
Disclosure of Invention
In order to solve the problems, the invention provides a liquid air energy storage power generation system which is operated in combination with a thermal power plant.
According to the invention, the liquid air energy storage power generation system which is operated in combination with the thermal power plant comprises: the system comprises a thermal power unit, a liquid air energy storage unit, an air cooling tower and a liquid air energy release unit.
The thermal power unit comprises a thermal power generation module and a waste steam recovery module. The thermal power generation module is connected with the exhaust steam recovery module.
The liquid air energy storage unit comprises a power turbine unit, an air compressor unit, a post-stage cooler, a cold accumulator and a low-temperature storage tank.
And the power turbine set is connected with the thermal power generation module. The air compressor unit is connected with the power steam turbine unit so that low-pressure steam of the thermal power generation module drives the power steam turbine unit to rotate and drive the air compressor unit to work. The after-stage cooler is connected with the air compressor set. The cold accumulator is connected with the after-stage cooler to further cool the compressed air to liquid air. The low-temperature storage tank is connected with the cold accumulator so as to store the liquid air into the low-temperature storage tank.
And the air cooling tower is respectively connected with the exhaust steam recovery module and the stage after-cooler to provide cold energy for the exhaust steam recovery module and the stage after-cooler.
The low-temperature storage tank is connected with the liquid air energy release unit to provide the liquid air for the liquid air energy release unit.
According to the liquid air energy storage power generation system which is operated in combination with the thermal power plant, the thermal power generation module comprises a coal mill, a steam boiler, a power generation steam turbine unit and a first generator. The exhaust steam recovery module comprises a condenser, a primary water supply pump, a heat regenerator and a secondary water supply pump.
The coal mill is connected with the steam boiler to provide pulverized coal for the steam boiler. And the exhaust port of the steam boiler is connected with the air inlet of the power generation steam turbine unit. The power generation turbine set is connected with the first generator to drive the first generator to generate power.
And a steam exhaust outlet of the power generation steam turbine unit is connected with an air inlet of the condenser. And the liquid outlet of the condenser is connected with the inlet of the primary water feeding pump. And the outlet of the primary water supply pump and the exhaust port of the power turbine unit are connected with the inlet of the heat regenerator. And the outlet of the heat regenerator is connected with the inlet of the secondary water feeding pump. And the outlet of the secondary feed water pump is connected with the steam boiler.
And the condenser is connected with the air cooling tower and forms a condenser refrigeration cycle loop. And a first circulating cold water pump serving as a circulating power source is installed on the condenser refrigeration circulating loop.
According to the liquid air energy storage power generation system which is operated in combination with the thermal power plant, the liquid air energy storage unit further comprises an air filter, a molecular sieve purification device, a throttling element and a gas-liquid separator. The air compressor set comprises a first-stage air compressor set and a second-stage air compressor set. The stage aftercoolers include a stage aftercooler and a stage aftercooler. The regenerator includes a first heat exchange side and a second heat exchange side.
And a steam extraction valve is arranged between a low-pressure steam outlet of the power generating steam turbine set and an air inlet of the power steam turbine set. The front end of the inlet of the primary air compressor unit is provided with the air filter. The primary air compressor unit and the secondary air compressor unit are both connected with the power turbine unit. And the outlet of the primary air compressor unit is connected with the inlet of the primary after-cooler. And the outlet of the primary after-cooler is connected with the inlet of the molecular sieve purifying device. And the outlet of the molecular sieve purifying device is connected with the inlet of the secondary air compressor unit. And the outlet of the secondary air compressor unit is connected with the inlet of the secondary after-cooler. And the outlet of the secondary after-cooler is connected with the inlet of the first heat exchange side of the cold accumulator. The outlet of the first heat exchange side is connected with the inlet of the throttling element. The outlet of the throttling element is connected with the inlet of the gas-liquid separator. And a liquid air outlet of the gas-liquid separator is connected with an inlet of the low-temperature storage tank. And a gas-phase air outlet of the gas-liquid separator is connected with an inlet of a second heat exchange side of the cold accumulator. And the outlet of the second heat exchange side is connected with the inlet of the secondary air compressor unit.
According to the liquid air energy storage and generation system which is operated in combination with the thermal power plant, the liquid air energy release unit comprises a low-temperature pump, an air preheater, an air turbine unit and a second generator. The regenerator further comprises a third heat exchange side.
Wherein, the inlet of the cryogenic pump is connected with the outlet of the cryogenic storage tank. And the outlet of the cryogenic pump is connected with the inlet of the third heat exchange side of the cold accumulator. And the outlet of the third heat exchange side is connected with the inlet of the air preheater. The outlet of the air preheater is connected to the air turbine assembly. The air turbine set is connected to the second generator.
According to the liquid air energy storage power generation system which is operated in combination with the thermal power plant, the air preheater comprises a primary air preheater and a secondary air preheater. The air turbine assembly includes a primary air turbine and a secondary air turbine.
And the air inlet of the primary air preheater is connected with the outlet of the third heat exchange side of the cold accumulator. And the air outlet of the primary air preheater is connected with the air inlet of the primary air turbine. And the exhaust port of the primary air turbine is connected with the air inlet of the secondary air preheater. And the air outlet of the secondary air preheater is connected with the air inlet of the secondary air turbine. The primary air turbine and the secondary air turbine are both connected to the second generator.
According to the liquid air energy storage power generation system which is operated in combination with the thermal power plant, the air preheater further comprises an exhaust gas preheater.
Wherein an air inlet of the exhaust preheater is connected to an air outlet of the secondary air turbine. And the gas outlet of the exhaust preheater is respectively connected with the molecular sieve purifying device and the coal mill. And a regeneration gas heater is connected between the molecular sieve purification device and the gas outlet of the exhaust preheater.
And the exhaust port of the secondary air turbine is connected with the inlet of the molecular sieve purifying device. And cold blowing flow control valves are arranged at the exhaust port of the secondary air turbine and the inlet of the molecular sieve purifying device.
According to the liquid air energy storage power generation system which is operated in combination with the thermal power plant, the first flow control valve is installed between the air outlet of the exhaust preheater and the coal mill. And a second flow control valve is arranged between the air outlet of the exhaust preheater and the regenerated gas heater.
The liquid air energy storage power generation system jointly operated with the thermal power plant further comprises a waste heat recycling unit.
The waste heat recycling unit comprises a waste heat recoverer and a smoke exhaust fan. And the inlet of the smoke exhaust fan is connected with the smoke exhaust outlet of the steam boiler. The outlet of the smoke exhaust fan is connected with the smoke inlet of the waste heat recoverer so as to store the heat in the smoke in the waste heat recoverer. And a smoke exhaust port of the waste heat recoverer is connected with a smoke purification device for purifying smoke. The flue gas purification device is connected with a chimney so as to discharge clean flue gas to the atmosphere.
According to the liquid air energy storage power generation system which is operated in combination with the thermal power plant, the waste heat recoverer is connected with the primary air preheater to form a primary air preheater heat exchange circulation loop. The waste heat recoverer is connected with the secondary air preheater to form a secondary air preheater heat exchange circulation loop. The waste heat recoverer is connected with the exhaust preheater to form an exhaust preheater heat exchange circulation loop. And a circulating hot water pump serving as a circulating power source is also arranged between the waste heat recoverer and the air preheater.
According to the liquid air energy storage power generation system which is operated in combination with the thermal power plant, the first-stage air preheater heat exchange circulation loop is provided with the third flow control valve. And a fourth flow control valve is arranged on the heat exchange circulating loop of the secondary air preheater. And a fifth flow control valve is arranged on the heat exchange circulating loop of the exhaust preheater.
According to the liquid air energy storage power generation system which is operated in combination with the thermal power plant, the air cooling tower is connected with the primary after-cooler to form a primary after-cooler refrigeration cycle loop. And the air cooling tower is connected with the secondary after-cooler to form a secondary after-cooler refrigeration cycle loop.
And a sixth flow control valve is arranged on the refrigeration cycle loop of the primary after-cooler. And a seventh flow control valve is arranged on the refrigeration cycle loop of the secondary after-cooler. And a second circulating cold water pump serving as a circulating power source is also arranged between the air cooling tower and the after-stage cooler.
In the liquid air energy storage power generation system which is operated in combination with a thermal power plant, the power steam turbine set is connected with the thermal power generation module, and the air compressor set is connected with the power steam turbine set, so that low-pressure steam of the thermal power generation module drives the power steam turbine set to rotate and drive the air compressor set to work. The after-stage cooler is connected with the air compressor set. The cold accumulator is connected with the after-stage cooler to further cool the compressed air to liquid air. The low-temperature storage tank is connected with the cold accumulator so as to store the liquid air into the low-temperature storage tank. And the air cooling tower is respectively connected with the exhaust steam recovery module and the stage after-cooler to provide cold energy for the exhaust steam recovery module and the stage after-cooler. The low-temperature storage tank is connected with the liquid air energy release unit to provide the liquid air for the liquid air energy release unit.
Through the structure, the liquid air energy storage power generation system jointly operated with the thermal power plant can realize the deep peak regulation of 30-150% of rated power of the peak regulation thermal power plant, can also enable the thermal power unit to always operate under a rated working condition, can improve the operating efficiency of the thermal power plant, and can realize the quick response of peak clipping and valley filling through the starting and stopping of the liquid air energy storage unit and the liquid air energy release unit.
Meanwhile, the power turbine set in the liquid air energy storage unit is driven to drive the air compressor set to operate by the low-voltage end interstage steam extraction in the thermal power generation module instead of driving the air compressor set to operate by electricity, so that the overall efficiency of the system is improved, and 'steam' is reduced
-energy conversion process of electric-motor-compressor ".
In addition, the exhaust steam recovery module and the after-stage cooler can share the circulating cooling water of the air cooling tower, so that the facility investment cost of the liquid air energy storage unit 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 introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a system schematic diagram of a liquid air energy storage power generation system operating in conjunction with a thermal power plant, according to an embodiment of the present invention;
reference numerals:
1: a steam boiler; 2: a coal mill; 3: a power generating turbine unit;
4: a condenser; 5: a primary feed pump; 6: a heat regenerator;
7: a secondary feed pump; 8: a steam extraction valve; 9: a power turbine unit;
10: a first circulating cold water pump; 11: an air cooling tower; 12: a second circulating cold water pump;
13: an air filter; 14: a primary air compressor unit; 15: a first stage aftercooler;
16: a molecular sieve purification unit; 17: a secondary air compressor unit; 18: a secondary aftercooler;
19: a sixth flow control valve; 20: a seventh flow control valve; 21: a regenerator;
22: a throttling element; 23: a gas-liquid separator; 24: a low-temperature storage tank;
25: a cryopump; 26: a primary air preheater; 27: a primary air turbine;
28: a secondary air preheater; 29: a secondary air turbine; 30: an exhaust gas preheater;
31: a third flow rate control valve; 32: a fourth flow control valve; 33: a fifth flow control valve;
34: a cold blow flow control valve; 35: a second flow control valve; 36: a regeneration gas heater;
37: a first flow control valve; 38: a circulating hot water pump; 39: a smoke exhaust fan;
40: a waste heat recoverer; 41: a flue gas purification device; 42: a chimney;
g1: a first generator; g2: a second generator; h1: a first heat exchange side;
h2: a second heat exchange side; h3: and a third heat exchange side.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "central", "longitudinal" and "longitudinal" are used herein,
Horizontal, up, down, front, back, left, right, vertical and horizontal,
The terms "top," "bottom," "inner," "outer," and the like, as used herein, are used for convenience in describing embodiments of the invention and in order to simplify the description, and are not intended to imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and are not to be construed as limiting the embodiments of the invention. In addition, the term
"first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification to make the purpose, technical solution, and advantages of the embodiments of the present invention more clear, and the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are a part of embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following describes a liquid air energy storage power generation system operating in conjunction with a thermal power plant according to an embodiment of the present invention with reference to fig. 1. It should be understood that the following description is only exemplary embodiments of the present invention and does not constitute any particular limitation of the present invention.
An embodiment of the present invention provides a liquid air energy storage power generation system operating in conjunction with a thermal power plant, as shown in fig. 1, the liquid air energy storage power generation system including: the system comprises a thermal power unit, a liquid air energy storage unit, an air cooling tower 11 and a liquid air energy release unit.
The thermal power unit comprises a thermal power generation module and a waste steam recovery module. The thermal power generation module is connected with the exhaust steam recovery module.
The liquid air energy storage unit comprises a power turbine set 9, an air compressor set, a post-stage cooler, a cold accumulator 21 and a low-temperature storage tank 24.
Wherein, the power turbine set 9 is connected with the thermal power generation module. The air compressor set is connected with the power steam turbine set 9, so that low-pressure steam of the thermal power generation module drives the power steam turbine set 9 to rotate and drives the air compressor set to work. The after-stage cooler is connected with the air compressor set. The cold accumulator 21 is connected to the after-stage cooler to further cool the compressed air to liquid air. The low temperature storage tank 24 is connected to the cold accumulator 21 to store liquid air into the low temperature storage tank 24.
And the air cooling tower 11 is respectively connected with the exhaust steam recovery module and the stage after-cooler to provide cold energy for the exhaust steam recovery module and the stage after-cooler.
The cryogenic tank 24 is connected to the liquid air energy release unit to provide liquid air to the liquid air energy release unit.
Through the structure, the liquid air energy storage power generation system jointly operated with the thermal power plant can realize the deep peak regulation of 30-150% of rated power of the peak regulation thermal power plant, can also enable the thermal power unit to always operate under a rated working condition, can improve the operating efficiency of the thermal power plant, and can realize the quick response of peak clipping and valley filling through the starting and stopping of the liquid air energy storage unit and the liquid air energy release unit.
Meanwhile, the power turbine set 9 in the liquid air energy storage unit is driven to drive the air compressor set to operate by the low-voltage end interstage steam extraction in the thermal power generation module instead of driving the air compressor set to operate by electricity, so that the overall efficiency of the system is improved, and the energy conversion process of steam-electricity-motor-compressor is reduced.
In addition, the exhaust steam recovery module and the after-stage cooler can share the circulating cooling water of the air cooling tower 11, thereby reducing the facility investment cost of the liquid air energy storage unit.
In one embodiment of the present invention, as shown in fig. 1, the thermal power generation module includes a coal mill 2, a steam boiler 1, a power generating turbine group 3, and a first generator G1. The exhaust steam recovery module comprises a condenser 4, a primary water supply pump 5, a heat regenerator 6 and a secondary water supply pump 7.
Wherein, the coal mill 2 is connected with the steam boiler 1 to provide pulverized coal for the steam boiler 1. The exhaust port of the steam boiler 1 is connected with the air inlet of the power generation steam turbine unit 3. The power generating turbine group 3 is connected to the first generator G1 to drive the first generator G1 to generate power.
The exhaust steam outlet of the power generation steam turbine unit 3 is connected with the air inlet of the condenser 4. The liquid outlet of the condenser 4 is connected with the inlet of a primary water feeding pump 5. The outlet of the primary water supply pump 5 and the exhaust port of the power turbine set 9 are both connected with the inlet of the heat regenerator 6. The outlet of the regenerator 6 is connected to the inlet of a secondary feed pump 7. The outlet of the secondary feed pump 7 is connected with the steam boiler 1.
The condenser 4 is connected to the air cooling tower 11 to form a condenser refrigeration cycle. A first circulating cold water pump 10 as a circulating power source is installed on the condenser refrigeration cycle loop.
In particular, in the power grid level section, the steam boiler 1 is operated at rated power. The high-temperature high-pressure steam generated by the steam boiler 1 can drive the power generation steam turbine set 3 to stably run at rated power, and further drive the first generator G1 to generate power and input the power to a power grid.
The dead steam from the power generation steam turbine unit 3 enters the condenser 4 from a dead steam outlet to be condensed into liquid, the liquid water enters the heat regenerator 6 after being pressurized by the primary water feeding pump 5, and is further pressurized by the secondary water feeding pump 7 and pumped into the steam boiler 1 to be reheated to generate high-temperature high-pressure steam.
Meanwhile, the circulating cooling water in the condenser 4 is driven by the first circulating cold water pump 10 to enter the air cooling tower 11 to be cooled by air, and then enters the condenser 4 to provide cooling capacity for the air cooling tower. At this time, neither the liquid air storage unit nor the liquid air energy release unit is operated.
It should be noted here that when the liquid air storage unit is operated, the liquid water condensed by the condenser 4 is pressurized by the primary water feed pump 5 and then enters the heat regenerator 6, the low-pressure steam discharged by the power turbine unit 9 is preheated to form low-pressure saturated water, and the low-pressure saturated water is mixed with the low-pressure saturated water formed by condensing the low-pressure steam and then enters the secondary water feed pump 7 together for further pressurization, and the formed high-pressure unsaturated water enters the steam boiler 1 again to be heated to generate high-temperature high-pressure steam.
For example, in one embodiment of the present invention, the steam boiler 1 includes, but is not limited to, a coal-fired boiler, a gas-fired boiler, and a waste heat boiler.
According to the embodiment described above, the power turbine set 9 is driven to operate by the interstage air extraction of the power generation turbine set 3, so that the low-pressure end flow of the steam turbine can be reduced, the length of the last stage blade can be further reduced, and the efficiency of the steam turbine can be improved.
In one embodiment of the present invention, the liquid air energy storage unit further comprises an air filter 13, a molecular sieve purification device 16, a throttling element 22 and a gas-liquid separator 23. The air compressor package includes a primary air compressor package 14 and a secondary air compressor package 17. The stage aftercoolers include a stage aftercooler 15 and a stage aftercooler 18. The regenerator 21 includes a first heat exchanging side H1 and a second heat exchanging side H2.
Wherein, a steam extraction valve 8 is arranged between the low-pressure steam outlet of the power generating steam turbine set 3 and the air inlet of the power steam turbine set 9. An air filter 13 is arranged at the front end of an inlet of the primary air compressor unit 14, and the primary air compressor unit 14 and the secondary air compressor unit 17 are both connected with the power turbine unit 9. The outlet of the primary air compressor package 14 is connected to the inlet of a primary aftercooler 15. The outlet of the first stage after-cooler 15 is connected to the inlet of a molecular sieve purification device 16. The outlet of the molecular sieve purification device 16 is connected to the inlet of a secondary air compressor unit 17. The outlet of the secondary air compressor package 17 is connected to the inlet of a secondary after-cooler 18. The outlet of the secondary after-cooler 18 is connected to the inlet of the first heat exchanging side H1 of the regenerator 21. The outlet of the first heat exchanging side H1 is connected to the inlet of the throttling element 22. The outlet of the throttling element 22 is connected to the inlet of a gas-liquid separator 23. The liquid air outlet of the gas-liquid separator 23 is connected to the inlet of the low-temperature storage tank 24. The gas-phase air outlet of the gas-liquid separator 23 is connected to the inlet of the second heat exchanging side H2 of the regenerator 21. The outlet of the second heat exchange side H2 is connected to the inlet of the secondary air compressor package 17.
Specifically, in the valley section of the power grid, the steam boiler 1 operates at rated power, and the generated high-pressure high-temperature steam drives the power generation turbine set 3 to generate power and is transmitted to the power grid.
Meanwhile, the steam extraction valve 8 is opened, part of low-pressure steam is extracted by the low-pressure stage of the power generation steam turbine set 3, the power generation steam turbine set 9 is driven to rotate, and the primary air compressor set 14 and the secondary air compressor set 17 are dragged to operate. For example, the low pressure stage bleed pressure may be 1-30 bar.
The air under normal temperature and pressure is filtered and dedusted by the air filter 13. For example, the air filter 13 includes, but is not limited to, a self-cleaning filter. The air after being filtered and dedusted is compressed to a high-temperature and high-pressure state by the first-stage air compressor unit 14, and then enters the first-stage after-cooler 15 to be cooled to a normal-temperature state. The air under normal temperature and high pressure enters a molecular sieve purification device 16 for decarburization and dehydration, and then enters a secondary after-cooler 18 to be cooled to normal temperature. The air in the normal temperature and high pressure state enters the regenerator 21 from the inlet of the first heat exchanging side H1 of the regenerator 21 and is cooled to a low temperature state. Then, the air enters the throttling element 22 from the outlet of the first heat exchanging side H1, and after the expansion and pressure reduction effects of the throttling element 22, the air with gas phase and liquid phase is generated and enters the gas-liquid separator 23.
The gas phase air flows back to the cold accumulator 21 through the inlet of the second heat exchange side H2 of the cold accumulator 21 to provide cold for the cold accumulator 21, then flows to the inlet of the secondary air compressor unit 17, and is pressurized and utilized by the secondary air compressor unit 17 together with the clean air decarburized and dehydrated by the molecular sieve purification device 16. The liquid air is stored in cryogenic tank 24. Therefore, the energy storage process of the liquid air is completed.
It should be noted that the above-mentioned embodiments are only illustrative embodiments of the present invention, and do not limit the present invention in any way.
For example, the air compressor set may include one or more air compressors, and the plurality of air compressors may be integrated in series or in parallel into the air compressor set. And, a stage after cooler is disposed after each stage of the air compressor, respectively. And the air compressor can be in a piston type, screw type or centrifugal type structure and the like.
Also for example, the invention is not limited in any way as to the type of throttling element 22 and cryogenic storage tank 24, and the throttling element 22 may be a cryogenic expander. Cryogenic expanders include, but are not limited to, flooded expanders or pure liquid expanders. Cryogenic storage tank 24 includes, but is not limited to, a dewar.
For another example, the regenerator 21 may employ one or more of a liquid phase (methanol, propane, R123, and the like), a solid phase (metal, rock, glass, and the like), or a phase change regenerator material. The liquid or gaseous air directly or indirectly contacts with the cold accumulation medium for heat exchange. The cold accumulators 21 may be one or more stages, and the connection between the cold accumulators may be a series connection or a parallel connection.
In one embodiment of the present invention, as shown in FIG. 1, the liquid air energy discharge unit includes a cryogenic pump 25, an air preheater, an air turbine set, and a second generator G2. The regenerator 21 further includes a third heat exchanging side H3.
Wherein, the inlet of the cryogenic pump 25 is connected with the outlet of the cryogenic storage tank 24. The outlet of the cryopump 25 is connected to the inlet of the third heat exchanging side H3 of the regenerator 21. The outlet of the third heat exchange side H3 is connected to the inlet of the air preheater. The outlet of the air preheater is connected to the air turbine assembly. The air turbine group is connected to a second generator G2.
Specifically, at the peak of the power consumption of the power grid, the steam boiler 1 operates at a rated power, and the generated high-pressure and high-temperature steam drives the power generation turbine set 3 to generate power and is transmitted to the power grid.
At this time, the liquid air energy storage unit is turned off. The cryopump 25 in the liquid air discharge unit is activated. The liquid air in the low-temperature storage tank 24 is pressurized by the low-temperature pump 25 and then enters the cold accumulator 21 through the third heat exchange side H3 of the cold accumulator 21, and the cold energy in the liquid air is stored in the cold accumulator 21 to provide cold energy for the air liquefaction process in the next liquid air storage cycle. The high-pressure air reheated by the cold accumulator 21 enters the air turbine unit to expand and do work after being preheated by the air preheater, and drives the second generator G2 to generate power and transmit the power to the power grid. Thereby, the energy release process of the liquid air is completed.
It should be noted here that the present invention is not limited in any way with respect to the specific configuration and number of the cryopump 25, the air preheater, and the air turbine group.
For example, the cryopump 25 may be of a piston type or centrifugal type;
for another example, the air preheater may be one or a combination of a shell-and-tube structure, a plate-fin structure, a wound-tube structure, and the like;
for another example, the air turbine unit may be in a radial flow type, an axial flow type, or a radial-axial flow type. And one or more air turbines may be included in the air turbine assembly. Wherein, a plurality of air turbines can be connected in series, in parallel or integrated to form an air turbine set. At the same time, an air preheater is correspondingly arranged in front of each stage of the air turbine.
In one embodiment of the present invention, as shown in FIG. 1, the air preheater comprises a primary air preheater 26 and a secondary air preheater 28. The air turbine assembly includes a primary air turbine 27 and a secondary air turbine 29.
Wherein, the air inlet of the primary air preheater 26 is connected with the outlet of the third heat exchanging side H3 of the regenerator 21. The outlet of the primary air preheater 26 is connected to the inlet of a primary air turbine 27. The outlet of the primary air turbine 27 is connected to the inlet of a secondary air preheater 28. The outlet of the secondary air preheater 28 is connected to the inlet of a secondary air turbine 29. The primary air turbine 27 and the secondary air turbine 29 are both connected to a second generator G2.
At this time, the high-pressure air reheated by the regenerator 21 is preheated by the primary air preheater 26, enters the primary air turbine 27 to perform expansion work, meanwhile, the exhaust gas of the primary air turbine 27 enters the secondary air preheater 28 to be preheated, enters the secondary air turbine 29 to perform expansion work, and the primary air turbine 27 and the secondary air turbine 29 drive the second generator G2 to generate power and transmit the power to the power grid. Thereby, the energy release process of the liquid air is completed.
In one embodiment of the present invention, as shown in FIG. 1, the air preheater further comprises a discharge gas preheater 30.
Wherein the inlet of the exhaust gas preheater 30 is connected to the outlet of the secondary air turbine 29. The outlet of the exhaust gas preheater 30 is connected to the molecular sieve purification device 16 and the coal mill 2, respectively. A regeneration gas heater 36 is connected between the molecular sieve purification device 16 and the outlet of the exhaust gas preheater 30.
And the exhaust of the secondary air turbine 29 is connected to the inlet of the molecular sieve purification device 16. A cold blow flow control valve 34 is provided at the outlet of the secondary air turbine 29 and the inlet of the molecular sieve purification unit 16.
Further, in one embodiment of the present invention, as shown in fig. 1, a first flow rate control valve 37 is installed between the outlet port of the exhaust gas preheater 30 and the coal pulverizer 2. A second flow control valve 35 is installed at the outlet of the exhaust preheater 30 and the regeneration gas heater 36.
Specifically, the exhaust gas of the secondary air turbine 29 is preheated by the exhaust gas preheater 30 and then branched. Wherein a portion of the preheated exhaust is directed into the coal pulverizer 2 for drying the coal fines. The other part of the preheated exhaust gas is guided into the regeneration gas heater 36 to be reheated and then enters the molecular sieve purification device 16 for hot blowing in the molecular sieve regeneration process. Meanwhile, by controlling the first flow rate control valve 37 and the second flow rate control valve 35, the distribution ratio of the hot gas to the coal mill 2 and to the molecular sieve purification apparatus 16 can be adjusted. After the hot blowing period is over, the cold blowing flow control valve 34 is opened, so that the exhaust gas of the second air turbine 29 directly enters the molecular sieve purification device 16 for cold blowing in the molecular sieve regeneration process, and the whole molecular sieve regeneration process is completed.
In one embodiment of the present invention, as shown in fig. 1, the liquid air energy storage power generation system operating in combination with a thermal power plant further comprises a waste heat recovery unit.
Wherein, the waste heat recycling unit comprises a waste heat recoverer 40 and a smoke exhaust fan 39. The inlet of the exhaust gas fan 39 is connected to the exhaust gas outlet of the steam boiler 1. The outlet of the smoke exhaust fan 39 is connected with the smoke inlet of the waste heat recoverer 40, so that the heat in the smoke is stored in the waste heat recoverer 40. A smoke purifying device 41 for purifying smoke is connected to the smoke outlet of the waste heat recoverer 40. The flue gas cleaning device 41 is connected to a stack 42 for discharging clean flue gas to the atmosphere.
Further, in one embodiment of the present invention, as shown in FIG. 1, the recuperator 40 is connected to the primary air preheater 26 to form a primary air preheater heat exchange cycle. The waste heat recoverer 40 is connected to the secondary air preheater 28 to form a secondary air preheater heat exchange circulation loop. The waste heat recoverer 40 is connected with the exhaust gas preheater 30 to form an exhaust gas preheater heat exchange circulation loop. A circulation hot water pump 38 is provided between the waste heat recovery unit 40 and the air preheater as a circulation power source.
Furthermore, in an embodiment of the present invention, a third flow control valve 31 is disposed on the heat exchange circulation loop of the primary air preheater; a fourth flow control valve 32 is arranged on the heat exchange circulating loop of the secondary air preheater; and a fifth flow control valve 33 is arranged on the heat exchange circulating loop of the exhaust preheater.
Specifically, the exhaust gas of the steam boiler 1 is pumped into the waste heat recovery device 40 by the exhaust fan 39, and the heat in the exhaust gas is stored in the waste heat recovery device 40. The cooled flue gas enters the flue gas purification device 41 to be purified. For example, the flue gas purification apparatus 41 is a desulfurization and denitrification apparatus. The flue gas purified by the flue gas purification device 41 is discharged to the atmosphere through a chimney 42.
The waste heat recoverer 40 is connected with the primary air preheater 26 and forms a primary air preheater heat exchange circulation loop. The waste heat recoverer 40 is connected with the secondary air preheater 28 and forms a secondary air preheater heat exchange circulation loop. The waste heat recoverer 40 is connected with the exhaust gas preheater 30 and forms an exhaust gas preheater heat exchange circulation loop. Thus, the waste heat recoverer 40 is enabled to provide heat to the primary air preheater 26, the secondary air preheater 28, and the exhaust gas preheater 30 under the driving action of the circulating hot water pump 38. Meanwhile, the heat distribution ratio into the primary air preheater 26, the secondary air preheater 28 and the exhaust gas preheater 30 can be adjusted by adjusting the third flow rate control valve 31, the fourth flow rate control valve 32 and the fifth flow rate control valve 33.
As can be understood from the above-described embodiments, the residual heat of the flue gas of the steam boiler 1 can be recovered by the residual heat recovery device 40. Also, this portion of the waste heat can be used in the first and second air preheaters 26, 28 to preheat the air turbine intake in the liquid air de-energizer unit. Therefore, the work efficiency of the air turbine unit can be greatly improved.
In one embodiment of the present invention, the air cooling tower 11 is connected to a stage one aftercooler 15 to form a stage one aftercooler refrigeration cycle. The air cooling tower 11 is connected to a secondary after-cooler 18 to form a secondary after-cooler refrigeration cycle.
Wherein, a sixth flow control valve 19 is arranged on the refrigeration cycle loop of the first-stage after cooler. And a seventh flow control valve 20 is arranged on the refrigerating circulation loop of the secondary after-cooler. A second circulating cold water pump 12 serving as a circulating power source is further installed between the air cooling tower 11 and the after-stage cooler.
As shown in fig. 1, the air cooling tower 11 is connected to a first-stage after-cooler 15 and forms a first-stage after-cooler refrigeration cycle loop. The air cooling tower 11 is connected with a secondary after-cooler 18 and forms a secondary after-cooler refrigeration cycle loop. Under the driving action of the second circulating cold water pump 12, the circulating cooling water in the first-stage after-cooler 15 and the second-stage after-cooler 18 can enter the air cooling tower 11 to be cooled by air, and then enters the first-stage after-cooler 15 and the second-stage after-cooler 18 to provide cooling capacity. Meanwhile, the distribution amount of the cooling water flowing into the first-stage after-cooler 15 and the second-stage after-cooler 18 can be adjusted by controlling the sixth flow control valve 19 and the seventh flow control valve 20.
It should be noted here that the above-mentioned first flow control valve 37, second flow control valve 35, third flow control valve 31, fourth flow control valve 32, fifth flow control valve 33, sixth flow control valve 19 and seventh flow control valve 20 each include, but are not limited to, a pneumatic control valve or an electric control valve.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A liquid air energy storage power generation system for operation in conjunction with a thermal power plant, comprising: a thermal power unit, a liquid air energy storage unit, an air cooling tower (11) and a liquid air energy release unit,
wherein the thermal power unit comprises a thermal power generation module and a waste steam recovery module, the thermal power generation module is connected with the waste steam recovery module,
the liquid air energy storage unit comprises a power turbine unit (9), an air compressor unit, a post-stage cooler, a cold accumulator (21) and a low-temperature storage tank (24),
wherein the power steam turbine set (9) is connected with the thermal power generation module, the air compressor set is connected with the power steam turbine set (9) so as to drive the power steam turbine set (9) to rotate and drive the air compressor set to work under the drive of low-pressure steam of the thermal power generation module, the stage after-cooler is connected with the air compressor set, the cold accumulator (21) is connected with the stage after-cooler so as to further cool the compressed air to liquid air, the low-temperature storage tank (24) is connected with the cold accumulator (21) so as to store the liquid air into the low-temperature storage tank (24),
and the air cooling tower (11) is respectively connected with the dead steam recovery module and the stage after-cooler to provide cold for the dead steam recovery module and the stage after-cooler,
the low-temperature storage tank (24) is connected with the liquid air energy release unit to provide the liquid air for the liquid air energy release unit.
2. The liquid air energy storage power generation system operated in combination with a thermal power plant according to claim 1, wherein the thermal power generation module comprises a coal mill (2), a steam boiler (1), a power generation steam turbine set (3) and a first generator (G1), the exhaust steam recovery module comprises a condenser (4), a primary water feed pump (5), a regenerator (6) and a secondary water feed pump (7),
wherein the coal mill (2) is connected with the steam boiler (1) to provide pulverized coal for the steam boiler (1), an exhaust port of the steam boiler (1) is connected with an air inlet of the power generation turbine set (3), the power generation turbine set (3) is connected with the first generator (G1) to drive the first generator (G1) to generate power,
the exhaust steam outlet of the power generation steam turbine set (3) is connected with the air inlet of the condenser (4), the liquid outlet of the condenser (4) is connected with the inlet of the primary water-feeding pump (5), the outlet of the primary water-feeding pump (5) and the air outlet of the power steam turbine set (9) are both connected with the inlet of the heat regenerator (6), the outlet of the heat regenerator (6) is connected with the inlet of the secondary water-feeding pump (7), the outlet of the secondary water-feeding pump (7) is connected with the steam boiler (1),
and the condenser (4) is connected with the air cooling tower (11) to form a condenser refrigeration circulation loop, and a first circulating cold water pump (10) serving as a circulating power source is installed on the condenser refrigeration circulation loop.
3. A liquid air energy storage and power generation system operated in conjunction with a thermal power plant according to claim 2, characterized in that the liquid air energy storage unit further comprises an air filter (13), a molecular sieve purification device (16), a throttling element (22) and a gas-liquid separator (23), the air compressor group comprises a primary air compressor group (14) and a secondary air compressor group (17), the post-stage cooler comprises a primary post-cooler (15) and a secondary post-cooler (18), the cold accumulator (21) comprises a first heat exchanging side (H1) and a second heat exchanging side (H2),
wherein a steam extraction valve (8) is arranged between a low-pressure steam outlet of the power generation steam turbine set (3) and an air inlet of the power steam turbine set (9), the front end of an inlet of a first-stage air compressor set (14) is provided with the air filter (13), the first-stage air compressor set (14) and a second-stage air compressor set (17) are both connected with the power steam turbine set (9), an outlet of the first-stage air compressor set (14) is connected with an inlet of a first-stage after cooler (15), an outlet of the first-stage after cooler (15) is connected with an inlet of a molecular sieve purifying device (16), an outlet of the molecular sieve purifying device (16) is connected with an inlet of the second-stage air compressor set (17), an outlet of the second-stage air compressor set (17) is connected with an inlet of the second-stage after cooler (18), the outlet of the secondary-stage aftercooler (18) is connected with the inlet of a first heat exchange side (H1) of the cold accumulator (21), the outlet of the first heat exchange side (H1) is connected with the inlet of the throttling element (22), the outlet of the throttling element (22) is connected with the inlet of the gas-liquid separator (23), the liquid air outlet of the gas-liquid separator (23) is connected with the inlet of the low-temperature storage tank (24), the gas-phase air outlet of the gas-liquid separator (23) is connected with the inlet of a second heat exchange side (H2) of the cold accumulator (21), and the outlet of the second heat exchange side (H2) is connected with the inlet of the secondary air compressor unit (17).
4. A liquid air energy storage and power generation system operating in conjunction with a thermal power plant according to claim 3, characterized in that the liquid air energy release unit comprises a cryogenic pump (25), an air preheater, an air turbine set and a second generator (G2), the cold accumulator (21) further comprises a third heat transfer side (H3),
the inlet of the low-temperature pump (25) is connected with the outlet of the low-temperature storage tank (24), the outlet of the low-temperature pump (25) is connected with the inlet of a third heat exchange side (H3) of the cold accumulator (21), the outlet of the third heat exchange side (H3) is connected with the inlet of the air preheater, the outlet of the air preheater is connected with the air turbine set, and the air turbine set is connected with the second generator (G2).
5. A liquid air energy storage power generation system operating in conjunction with a thermal power plant according to claim 4, characterized in that the air preheater comprises a primary air preheater (26) and a secondary air preheater (28), and the air turbine set comprises a primary air turbine (27) and a secondary air turbine (29),
the air inlet of the primary air preheater (26) is connected with the outlet of a third heat exchange side (H3) of the cold accumulator (21), the air outlet of the primary air preheater (26) is connected with the air inlet of the primary air turbine (27), the air outlet of the primary air turbine (27) is connected with the air inlet of the secondary air preheater (28), the air outlet of the secondary air preheater (28) is connected with the air inlet of the secondary air turbine (29), and the primary air turbine (27) and the secondary air turbine (29) are both connected with the second generator (G2).
6. The liquid air energy storage and power generation system operating in conjunction with a thermal power plant of claim 5, wherein the air preheater further comprises a discharge preheater (30),
wherein the air inlet of the exhaust preheater (30) is connected with the air outlet of the secondary air turbine (29), the air outlet of the exhaust preheater (30) is respectively connected with the molecular sieve purification device (16) and the coal mill (2), and a regeneration gas heater (36) is connected between the molecular sieve purification device (16) and the air outlet of the exhaust preheater (30),
an exhaust port of the secondary air turbine (29) is connected to an inlet of the molecular sieve purification device (16), and a cold blow flow control valve (34) is provided between the exhaust port of the secondary air turbine (29) and the inlet of the molecular sieve purification device (16).
7. The liquid air energy-storage power generation system operated in combination with a thermal power plant according to claim 6, characterized in that a first flow control valve (37) is installed between the air outlet of the exhaust gas preheater (30) and the coal pulverizer (2), and a second flow control valve (35) is installed between the air outlet of the exhaust gas preheater (30) and the regeneration gas heater (36).
8. The liquid air energy storage and power generation system operated in conjunction with a thermal power plant of claim 6, further comprising a waste heat recovery and utilization unit,
the waste heat recycling unit comprises a waste heat recoverer (40) and a smoke exhaust fan (39), the inlet of the smoke exhaust fan (39) is connected with the smoke exhaust outlet of the steam boiler (1), the outlet of the smoke exhaust fan (39) is connected with the smoke inlet of the waste heat recoverer (40) so as to store heat in smoke in the waste heat recoverer (40), the smoke exhaust outlet of the waste heat recoverer (40) is connected with a smoke purifying device (41) used for purifying the smoke, and the smoke purifying device (41) is connected with a chimney (42) so as to exhaust clean smoke to the atmosphere.
9. The liquid air energy storage power generation system jointly operated with a thermal power plant as claimed in claim 8, characterized in that the waste heat recoverer (40) is connected with the primary air preheater (26) to form a primary air preheater heat exchange circulation loop, the waste heat recoverer (40) is connected with the secondary air preheater (28) to form a secondary air preheater heat exchange circulation loop, the waste heat recoverer (40) is connected with the exhaust air preheater (30) to form an exhaust air preheater heat exchange circulation loop, and a circulating hot water pump (38) as a circulating power source is further arranged between the waste heat recoverer (40) and the air preheater.
10. The liquid air energy-storage power generation system operated in combination with a thermal power plant as claimed in claim 9, wherein a third flow control valve (31) is arranged on the primary air preheater heat exchange circulating loop, a fourth flow control valve (32) is arranged on the secondary air preheater heat exchange circulating loop, and a fifth flow control valve (33) is arranged on the exhaust air preheater heat exchange circulating loop.
11. A liquid air energy storage and power generation system operated in conjunction with a thermal power plant according to claim 3, characterized in that the air cooling tower (11) is connected with the primary after-cooler (15) to form a primary after-cooler refrigeration cycle, the air cooling tower (11) is connected with the secondary after-cooler (18) to form a secondary after-cooler refrigeration cycle,
the air cooling tower is characterized in that a sixth flow control valve (19) is arranged on the refrigeration circulation loop of the primary after-cooler, a seventh flow control valve (20) is arranged on the refrigeration circulation loop of the secondary after-cooler, and a second circulating cold water pump (12) serving as a circulating power source is further installed between the air cooling tower (11) and the secondary after-cooler.
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| CN115313667B (en) * | 2022-07-28 | 2023-04-25 | 北京百度网讯科技有限公司 | Energy storage system coupled with steam cycle and control method of energy storage system |
| CN115234318B (en) * | 2022-09-22 | 2023-01-31 | 百穰新能源科技(深圳)有限公司 | Carbon dioxide energy storage system matched with thermal power plant deep peak regulation and control method thereof |
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| CN112065517A (en) * | 2020-09-29 | 2020-12-11 | 西安热工研究院有限公司 | Back pressure steam turbine driven liquid compressed air energy storage peak shaving system |
| CN112234634B (en) * | 2020-10-19 | 2022-01-28 | 中国科学院理化技术研究所 | Hybrid energy storage power generation system and method |
| CN112780375A (en) * | 2021-03-05 | 2021-05-11 | 中国华能集团清洁能源技术研究院有限公司 | Compressed air energy storage system coupled with thermal power plant and using method thereof |
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