A peak shaving system coupling a condensing unit and a circulating fluidized bed heat storage

Abstract

The present application discloses a peak shaving system coupling a condensing unit with circulating fluidized bed heat storage, comprising: a condensing unit subsystem and a circulating fluidized bed heat storage subsystem. The circulating fluidized bed heat storage subsystem includes a high-pressure fluidizing fan, a first valve, an air heating device, a fluidized bed, and a cyclone separator. The high-pressure fluidizing fan is connected to the fluidized bed through the first valve. The fluidized bed is connected to the cyclone separator, and the cyclone separator is connected to a high-temperature water-air heat exchanger. The air heating device is connected in parallel with the first valve. When the circulating fluidized bed heat storage subsystem stores heat, the air heating device can obtain energy from the condensing unit subsystem to heat air. The high-temperature air enters the fluidized bed to fluidize the heat storage working medium while heating the heat storage working medium. When discharging heat, the high-temperature air is transported to the high-temperature water-air heat exchanger for heat exchange. Through the fluidized bed heat storage subsystem, the energy of the condensing unit can be stored during the valley electricity period to increase the flexibility of the condensing unit and achieve deep peak shaving.

Description

Technical Field

[0001] The present application relates to the technical field of power generation systems, and in particular to a peak shaving system coupling a condensing unit and a circulating fluidized bed heat storage system. Background Art

[0002] A condensing unit is an important device in the field of thermal power generation. It mainly includes devices such as a feed water pump, a boiler, a steam turbine, a generator, a condenser, and a condensate pump. The feed water pump delivers water to the boiler, the boiler heats the water to form steam, the steam enters the steam turbine, is converted into mechanical energy by the steam turbine, and then the mechanical energy is converted into electrical energy by the generator. The exhaust steam generated by the steam turbine enters the condenser, and then the water is circulated and transported through the condensate pump.

[0003] During actual operation, the condensing unit needs to perform peak shaving. However, the existing peak shaving capacity of the condensing unit is generally about half of its rated capacity, and there is a problem of insufficient flexibility in the operating load of the unit.

[0004] Therefore, how to improve the adjustment range of the condensing unit is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] The purpose of the present application is to provide a peak shaving system coupling a condensing unit and a circulating fluidized bed heat storage system, which can increase the flexibility of the condensing unit and achieve deep peak shaving.

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] A peak shaving system coupling a condensing unit and a circulating fluidized bed heat storage system, comprising:

[0008] A condensing unit subsystem, including a feed water pump, a boiler, a steam turbine, and a generator. The feed water pump is used to deliver water to the boiler, the boiler is used to provide steam to the steam turbine, a high-temperature water-air heat exchanger is provided between the feed water pump and the boiler, and the steam turbine is used to provide mechanical energy to the generator;

[0009] A circulating fluidized bed heat storage subsystem, including a high-pressure fluidizing fan, a first valve, an air heating device, a fluidized bed, and a cyclone separator. The high-pressure fluidizing fan is connected to the fluidized bed through the first valve, the fluidized bed is connected to the cyclone separator, the cyclone separator is connected to the high-temperature water-air heat exchanger, and the air heating device is connected in parallel with the first valve. The air heating device is used to obtain energy from the condensing unit subsystem during heat storage to heat the air conveyed by the high-pressure fluidizing fan.

[0010] Preferably, the air heating device is an electric-air heater, which is connected to the generator and is used to obtain electric energy from the generator.

[0011] Preferably, the air heating device is a steam-air heater, which is connected to the main steam pipeline of the boiler or the extraction steam pipeline of the steam turbine and is used to obtain heat energy.

[0012] Preferably, the pure condensing unit subsystem further includes a low-pressure heater and a deaerator. The deaerator is connected to the low-pressure heater and the feed water pump, and the steam-air heater is connected to the deaerator.

[0013] Preferably, the peak shaving system further includes an industrial steam heat exchanger, a combined cooling, heating and power subsystem, and a hot water heat exchanger. The cyclone separator is sequentially connected to the combined cooling, heating and power subsystem through a second valve and the industrial steam heat exchanger. The cyclone separator is also connected to the high-temperature water-air heat exchanger through a third valve. The high-temperature air output by the cyclone separator sequentially passes through the industrial steam heat exchanger, the combined cooling, heating and power subsystem, and the hot water heat exchanger.

[0014] Preferably, the combined cooling, heating and power subsystem includes an absorber, a booster pump, a heat exchanger, a generator, a throttle valve, a turbine, and an evaporator. The outlet of the absorber is connected to the inlet of the booster pump. The outlet of the booster pump is connected to the cold working fluid inlet of the heat exchanger. The cold working fluid outlet of the heat exchanger is connected to the inlet of the generator. The outlet of the lithium bromide-water lean solution of the generator is connected to the hot working fluid inlet of the heat exchanger. The hot working fluid outlet of the heat exchanger is connected to the inlet of the absorber through the throttle valve. The outlet of the refrigerant water of the generator is connected to the inlet of the turbine. The outlet of the turbine is connected to the inlet of the evaporator. The outlet of the evaporator is connected to the inlet of the absorber.

[0015] Preferably, the number of the circulating fluidized bed heat storage subsystems is multiple, and the multiple circulating fluidized bed heat storage subsystems are respectively connected to the high-temperature water-air heat exchanger through their respective cyclone separators.

[0016] Preferably, the pure condensing unit further includes a condensate-air heat exchanger connected to the high-temperature water-air heat exchanger.

[0017] Preferably, the circulating fluidized bed heat storage subsystem further includes a storage bin and a screw feeder, and the screw feeder is used to convey the materials in the storage bin to the fluidized bed.

[0018] Preferably, the circulating fluidized bed heat storage subsystem further includes a return feeder and a discharging device. The return feeder is used to convey the materials separated by the cyclone separator to the fluidized bed, and the discharging device is arranged at the bottom of the fluidized bed.

[0019] Compared with the prior art, the above technical solution has the following advantages:

[0020] A peak shaving system coupling a condensing unit and a circulating fluidized bed heat storage provided by the present application includes: a condensing unit subsystem and a circulating fluidized bed heat storage subsystem. The circulating fluidized bed heat storage subsystem includes a high-pressure fluidizing fan, a first valve, an air heating device, a fluidized bed, and a cyclone separator. The high-pressure fluidizing fan is connected to the fluidized bed through the first valve. The fluidized bed is connected to the cyclone separator, and the cyclone separator is connected to a high-temperature water-air heat exchanger. The air heating device is connected in parallel with the first valve. When the circulating fluidized bed heat storage subsystem stores heat, the air heating device can obtain energy from the condensing unit subsystem to heat the air conveyed by the high-pressure fluidizing fan. The high-temperature air enters the fluidized bed to fluidize the heat storage working medium while heating the heat storage working medium. When the circulating fluidized bed heat storage subsystem releases heat, the high-temperature air is conveyed to the high-temperature water-air heat exchanger through the cyclone separator for heat exchange. Through the fluidized bed heat storage subsystem, the energy of the condensing unit can be stored during the valley electricity period to increase the flexibility of the condensing unit and achieve deep peak shaving. Among them, the circulating fluidized bed heat storage subsystem can realize large-scale medium and high-temperature heat storage and output high-quality heat. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 A peak shaving system coupling a condensing unit and a circulating fluidized bed heat storage provided by a specific embodiment of the present application;

[0023] Figure 2 A peak shaving system coupling a condensing unit and a circulating fluidized bed heat storage provided by another specific embodiment of the present application.

[0024] The reference numerals are as follows:

[0025] 11 is a boiler, 12 is a steam turbine, 13 is a condenser, 14 is a condensate pump, 15 is a low-pressure heater, 16 is a deaerator, 17 is a feed water pump, 18 is a high-pressure heater, 19 is a generator, 191 is an electric power logistics, and 111 is a steam extraction logistics;

[0026] 21 is a high-pressure fluidizing fan, 22 is a first valve, 231 is an electric-air heater, 232 is a steam-air heat exchanger, 24 is a storage bin, 25 is a screw feeder, 26 is a fluidized bed, 27 is a cyclone separator, 28 is a return feeder, 29 is a second valve, 210 is a third valve, 211 is a discharging device;

[0027] 31 is a high-temperature water-air heat exchanger, 32 is a condensate-water-air heat exchanger;

[0028] 41 is an industrial steam heat exchanger;

[0029] 51 is an absorber, 52 is a booster pump, 53 is a heat exchanger, 54 is a generator, 55 is a throttle valve, 56 is a turbine, 57 is an evaporator;

[0030] 61 is a hot water heat exchanger. Specific Embodiments

[0031] In order to make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the specific embodiments of the present application in detail with reference to the accompanying drawings.

[0032] In the following description, specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0033] Please refer to Figure 1 and Figure 2 , Figure 1 which is a peak shaving system coupling a condensing unit and a circulating fluidized bed heat storage provided by a specific embodiment of the present application; Figure 2 which is a peak shaving system coupling a condensing unit and a circulating fluidized bed heat storage provided by another specific embodiment of the present application.

[0034] A specific embodiment of the present application provides a peak shaving system coupling a condensing unit and a circulating fluidized bed heat storage, including: a condensing unit subsystem and a circulating fluidized bed heat storage subsystem. The condensing unit subsystem includes a feed water pump 17, a boiler 11, a steam turbine 12, and a generator 19. The feed water pump 17 is used to supply water to the boiler 11, the boiler 11 is used to provide steam to the steam turbine 12, and a high-temperature water-air heat exchanger 31 is provided between the feed water pump 17 and the boiler 11. The steam turbine 12 is used to provide mechanical energy to the generator 19. The circulating fluidized bed heat storage subsystem includes a high-pressure fluidizing fan 21, a first valve 22, an air heating device, a fluidized bed 26, and a cyclone separator 27. The high-pressure fluidizing fan 21 is connected to the fluidized bed 26 through the first valve 22. The fluidized bed 26 is connected to the cyclone separator 27, and the cyclone separator 27 is connected to the high-temperature water-air heat exchanger 31. The air heating device is connected in parallel with the first valve 22. When the circulating fluidized bed heat storage subsystem stores heat, the air heating device can obtain energy from the condensing unit subsystem to heat the air conveyed by the high-pressure fluidizing fan 21. The high-temperature air enters the fluidized bed 26 to fluidize the heat storage working medium while heating the heat storage working medium. When the circulating fluidized bed heat storage subsystem releases heat, the high-temperature air is conveyed to the high-temperature water-air heat exchanger 31 through the cyclone separator 27 for heat exchange. Through the fluidized bed heat storage subsystem, the energy of the condensing unit can be stored during the valley electricity period to increase the flexibility of the condensing unit and achieve deep peak shaving.

[0035] In some embodiments, as Figure 1 shown, the air heating device is preferably an electric-air heater 231. The electric-air heater 231 is connected to the generator 19, and the required electric power logistics 191 of the electric-air heater 231 is provided by the generator 19. That is, the electric-air heater 231 can obtain electric energy from the generator 19 to heat the air conveyed by the high-pressure fluidizing fan 21, and then store heat in the circulating fluidized bed heat storage subsystem, so as to reduce the power generation and grid connection ratio of the condensing unit.

[0036] In some embodiments, as Figure 2 shown, the air heating device is preferably a steam-air heater 232. The steam-air heater 232 is connected to the main steam pipeline of the boiler 11 or the extraction steam pipeline of the steam turbine 12. That is, the required steam extraction logistics 111 of the steam-air heater 232 can come from the main steam pipeline or the extraction steam pipeline of the steam turbine 12. During the valley electricity period, the main steam pipeline of the condensing unit or the steam turbine 12 can be extracted for load reduction regulation. After the steam-air heater obtains heat energy therefrom, it can heat the air conveyed by the high-pressure fluidizing fan 21, and then store heat in the circulating fluidized bed heat storage subsystem to reduce the power generation of the condensing unit.

[0037] Among them, the pure condensing unit subsystem further includes a low-pressure heater 15 and a deaerator 16. The deaerator 16 is connected to the low-pressure heater 15 and a feed water pump 17. The deaerator 16 is located after the low-pressure heater 15 and before the feed water pump 17. When a steam-air heater 232 is selected to heat the air conveyed by the high-pressure fluidized bed fan 21, the steam-air heater 232 is connected to the deaerator 16, and the steam is discharged to the deaerator 16 after releasing heat.

[0038] In some embodiments of the present application, it further includes an industrial steam heat exchanger 41, a combined cooling and power generation subsystem, and a hot water heat exchanger 61. The cyclone separator 27 is sequentially connected to the combined cooling and power generation subsystem through a second valve 29 and the industrial steam heat exchanger 41. Any one, any two, or all three of the industrial steam heat exchanger 41, the combined cooling and power generation subsystem, and the hot water heat exchanger 61 can be selected to be connected to the second valve 29. For example, when two or three of them are selected, they can be connected to the second valve 29 in series or in parallel. The following preferred scheme is adopted: the cyclone separator 27 is sequentially connected to the industrial steam heat exchanger 41, the combined cooling and power generation subsystem, and the hot water heat exchanger 61 through the second valve 29. The high-temperature air output by the cyclone separator 27 sequentially passes through the industrial steam heat exchanger 41, the combined cooling and power generation subsystem, and the hot water heat exchanger 61, and high-temperature and high-pressure industrial steam, cold and electricity, and domestic hot water are respectively output. Among the high-temperature air output by the circulating fluidized bed energy storage subsystem, the high-temperature section air is used to produce industrial steam, the medium-temperature section air is used to drive the combined cooling and power generation subsystem to cycle and generate cold and electricity, and the low-temperature section air is used to produce hot water, realizing the cascaded utilization of energy and improving the energy utilization efficiency of the system.

[0039] Among them, the combined cooling and power generation subsystem includes an absorber 51, a booster pump 52, a heat exchanger 53, a generator 54, a throttle valve 55, a turbine 56, and an evaporator 57. The outlet of the absorber 51 is connected to the inlet of the booster pump 52. The outlet of the booster pump 52 is connected to the cold working fluid inlet of the heat exchanger 53. The cold working fluid outlet of the heat exchanger 53 is connected to the inlet of the generator 54. The outlet of the lithium bromide-water lean solution of the generator 54 is connected to the hot working fluid inlet of the heat exchanger 53. The hot working fluid outlet of the heat exchanger 53 is connected to the inlet of the absorber 51 through the throttle valve 55. The outlet of the refrigerant water of the generator 54 is connected to the inlet of the turbine 56. The outlet of the turbine 56 is connected to the inlet of the evaporator 57. The outlet of the evaporator 57 is connected to the inlet of the absorber 51. When the combined cooling and power generation subsystem operates, the basic solution of lithium bromide-water enters the generator 54 after being pressurized by the booster pump 52 and absorbing heat in the heat exchanger 53 from the absorber 51. The basic solution of lithium bromide-water absorbs heat and separates into water vapor and lithium bromide-water lean solution in the generator 54. The water vapor successively does work through the turbine 56 for power generation and outputs cold through the evaporator 57. The lithium bromide-water lean solution releases heat through the heat exchanger 53 and is depressurized by the throttle valve 55 and then enters the absorber 51. In the absorber 51, the lean solution absorbs the water vapor at the outlet of the evaporator 57 to form a new basic solution.

[0040] In some embodiments, the condensing unit further includes a condenser 13, a condensate pump 14, a high-pressure heater 18, and a condensate-water-air heat exchanger 32. The outlet of the boiler 11 is sequentially connected to the steam turbine 12, the condenser 13, the condensate pump 14, the low-pressure heater 15, the deaerator 16, the feed water pump 17, and the high-pressure heater 18. The outlet of the high-pressure heater 18 is connected to the inlet of the boiler 11. The inlets of the low-pressure heater 15, the deaerator 16, and the high-pressure heater 18 are all connected to the extraction steam of the steam turbine 12. The condensate-water-air heat exchanger 32 is connected between the condensate pump 14 and the low-pressure heater 15 and is connected to the high-temperature water-air heat exchanger 31. When the circulating fluidized bed heat storage subsystem releases heat, it can achieve cascaded heating of high-temperature and high-pressure water and condensate water.

[0041] In some embodiments, the number of circulating fluidized bed heat storage subsystems is multiple. The multiple circulating fluidized bed heat storage subsystems are respectively connected to the high-temperature water-air heat exchanger 31 through their respective cyclone separators 27. In addition, the multiple circulating fluidized bed heat storage subsystems are also respectively connected to the industrial steam heat exchanger 41 through their respective cyclone separators 27. That is, each circulating fluidized bed heat storage subsystem is in parallel and shares the second valve 29 and the third valve 210 to be coupled with the condensing unit subsystem and the combined cooling and power generation subsystem respectively. That is, one condensing unit subsystem and one combined cooling and power generation subsystem are coupled with multiple circulating fluidized bed heat storage subsystems to improve the selectivity of heat storage and heat release.

[0042] In some embodiments, the circulating fluidized bed heat storage subsystem further includes a storage bin 24, a screw feeder 25, a return feeder 28, and a discharging device 211. The screw feeder 25 is used to convey the materials in the storage bin 24 to the fluidized bed 26; the return feeder 28 is used to convey the materials separated by the cyclone separator 27 to the fluidized bed 26, and the discharging device is arranged at the bottom of the fluidized bed 26. The connection relationships of the various devices of the circulating fluidized bed heat storage subsystem are as follows: the outlet of the high-pressure fluidizing fan 21 is connected to the inlet of the air heating device, and the outlet of the high-pressure fluidizing fan 21 is also simultaneously connected to the first valve 22. The outlets of the air heating device and the first valve 22 are connected to the bottom inlet of the fluidized bed 26. The top outlet of the fluidized bed 26 is connected to the inlet of the cyclone separator 27. The top outlet of the cyclone separator 27 is divided into two paths. A second valve 29 is provided on one path, and a third valve 210 is provided on the other path. When the second valve 29 is opened and the third valve 210 is closed, the high-temperature air sequentially passes through the industrial steam heat exchanger 41, the generator of the cold and power co-generation subsystem, and the hot water heat exchanger 53; when the second valve 29 is closed and the third valve 210 is opened, the high-temperature air sequentially passes through the high-temperature water-air heat exchanger 31 and the condensate-air heat exchanger 32. The bottom outlet of the cyclone separator 27 is connected to the return feeder 28, the outlet of the return feeder 28 is connected to the fluidized bed 26, the outlet of the storage bin 24 is connected to the inlet of the screw feeder, and the outlet of the screw feeder 25 is connected to the fluidized bed 26. The heat storage working medium of the fluidized bed heat storage subsystem can adopt river sand or coal ash.

[0043] When the circulating fluidized bed heat storage subsystem starts to store heat, the cold heat storage working medium in the storage bin 24 is added to the fluidized bed 26 through the screw feeder 25. The high-pressure fluidizing fan 21 is started. Part of the main steam output by the boiler 11 heats the air through the steam-air heat exchanger 232, or part of the electric energy output by the generator 19 heats the air through the electric-air heater 231. The high-temperature air enters the fluidized bed 26 to fluidize the heat storage working medium while heating the heat storage working medium. The high-temperature air at the top outlet of the fluidized bed 26 carries a certain amount of heat storage working medium into the cyclone separator 27. The top of the cyclone separator 27 opens the second valve 29 and closes the third valve 210. The high-temperature air sequentially releases heat through the industrial steam heat exchanger 41, the generator of the cold and power co-generation subsystem, and the hot water heat exchanger 61, and outputs high-temperature and high-pressure industrial steam, cold and electricity, and domestic hot water respectively. The heat storage working medium separated by the cyclone separator 27 returns to the fluidized bed 26 through the return feeder 28. When the temperature measuring points arranged at the top, middle, and bottom of the fluidized bed 26 reach the set heat storage temperature and the temperature difference is less than 30 °C, it can be considered that the heat storage is completed, and the electric-air heater or the steam-air heater is disconnected, and at the same time the high-pressure fluidizing fan 21 is closed. During the heat storage process, the cold heat storage working medium can be replenished at any time through the storage bin 24.

[0044] When the heat storage subsystem of the circulating fluidized bed 26 starts to release heat, the high-pressure fluidizing fan 21 is turned on. Cold air directly enters the fluidized bed 26 through the first valve 22 to fluidize the heat storage working medium. At the same time, the cold air is heated by the heat storage working medium to become high-temperature air. After the high-temperature air leaves the cyclone separator 27, by opening the third valve 210 and closing the second valve 29, the high-temperature air can be controlled to sequentially pass through the high-temperature water-air heat exchanger 31 and the condensate-air heat exchanger 32 to stepwise heat the high-temperature and high-pressure water and condensate. Or by closing the third valve 210 and opening the second valve 29, the high-temperature air can sequentially pass through the industrial steam heat exchanger 41, the cold and power co-generation subsystem, and the hot water heat exchanger 61 to release heat, respectively outputting high-temperature and high-pressure industrial steam, cold and electricity, and domestic hot water. When the temperature measuring points arranged at the top, middle, and bottom of the fluidized bed 26 reach the set heat release temperature and the temperature difference is less than 30 °C, it can be considered that the heat release is completed. At this time, the high-pressure fluidizing fan 21 is turned off.

[0045] When it is necessary to replace the heat storage working medium, the heat storage working medium is discharged through the discharging device 211 at the bottom of the fluidized bed 26, and then it can be replenished through the storage bin 24.

[0046] During the heat storage and heat release processes of the heat storage subsystem of the circulating fluidized bed, there are only physical changes and no chemical reactions in the fluidized bed.

[0047] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0048] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A peak shaving system coupling a condensing unit and heat storage of a circulating fluidized bed, characterized in that Comprising: A condensing unit subsystem, including a feed water pump (17), a boiler (11), a steam turbine (12) and a generator (19), wherein the feed water pump (17) is used to supply water to the boiler (11), the boiler (11) is used to provide steam for the steam turbine (12), a high-temperature water-air heat exchanger (31) is provided between the feed water pump (17) and the boiler (11), and the steam turbine (12) is used to provide mechanical energy for the generator (19); A circulating fluidized bed heat storage subsystem, including a high-pressure fluidizing fan (21), a first valve (22), an air heating device, a fluidized bed (26), and a cyclone separator (27), wherein the high-pressure fluidizing fan (21) is connected to the fluidized bed (26) through the first valve (22), the fluidized bed (26) is connected to the cyclone separator (27), the cyclone separator (27) is connected to the high-temperature water-air heat exchanger (31), and the air heating device is connected in parallel with the first valve (22), and the air heating device is used to obtain energy from the condensing unit subsystem during heat storage to heat the air conveyed by the high-pressure fluidizing fan (21); The air heating device is an electric-air heater (231), and the electric-air heater (231) is connected to the generator (19), and the electric-air heater (231) is used to obtain electric energy from the generator (19); The air heating device is a steam-air heater (232), and the steam-air heater (232) is connected to the main steam pipeline of the boiler (11) or the extraction steam pipeline of the steam turbine (12), and the steam-air heater (232) is used to obtain heat energy; It further includes an industrial steam heat exchanger (41), a combined cooling, heating and power subsystem, and a hot water heat exchanger (61), wherein the cyclone separator (27) is sequentially connected to the combined cooling, heating and power subsystem through a second valve (29) and the industrial steam heat exchanger (41), and the cyclone separator (27) is also connected to the high-temperature water-air heat exchanger (31) through a third valve (210), and the high-temperature air output by the cyclone separator (27) sequentially passes through the industrial steam heat exchanger (41), the combined cooling, heating and power subsystem, and the hot water heat exchanger (61).

2. The peak shaving system for coupling a condensing unit and a circulating fluidized bed heat storage according to claim 1, wherein The condensing unit subsystem further includes a low-pressure heater (15) and a deaerator (16), the deaerator (16) is connected to the low-pressure heater (15) and the feed water pump (17), and the steam-air heater (232) is connected to the deaerator (16).

3. The peak shaving system for coupling a condensing unit and a circulating fluidized bed heat storage according to claim 1, characterized in that, The cold and power co-generation subsystem includes an absorber (51), a booster pump (52), a heat exchanger (53), a generator (54), a throttle valve (55), a turbine (56), and an evaporator (57). The outlet of the absorber (51) is connected to the inlet of the booster pump (52), the outlet of the booster pump (52) is connected to the cold working fluid inlet of the heat exchanger (53), the cold working fluid outlet of the heat exchanger (53) is connected to the inlet of the generator (54), the outlet of the lithium bromide-water lean solution of the generator (54) is connected to the hot working fluid inlet of the heat exchanger (53), the hot working fluid outlet of the heat exchanger (53) is connected to the inlet of the absorber (51) through the throttle valve (55), the outlet of the refrigerant water of the generator (54) is connected to the inlet of the turbine (56), the outlet of the turbine (56) is connected to the inlet of the evaporator (57), and the outlet of the evaporator (57) is connected to the inlet of the absorber (51).

4. The peak shaving system for coupling a condensing unit and a circulating fluidized bed heat storage according to claim 1, wherein The number of the circulating fluidized bed heat storage subsystems is multiple, and multiple said circulating fluidized bed heat storage subsystems are respectively connected to the high-temperature water-air heat exchanger (31) through their respective cyclone separators (27).

5. The peak shaving system for coupling a condensing unit and a circulating fluidized bed heat storage according to claim 1, wherein The condensing unit further includes a condensate-air heat exchanger (32) connected to the high-temperature water-air heat exchanger (31).

6. The peak shaving system of the pure condensing unit coupled with the circulating fluidized bed heat storage according to claim 1, wherein The circulating fluidized bed heat storage subsystem further includes a storage bin (24) and a screw feeder (25), and the screw feeder (25) is used for conveying the materials in the storage bin (24) to the fluidized bed (26).

7. The peak shaving system for coupling a condensing unit and a circulating fluidized bed heat storage according to claim 1, characterized in that, The circulating fluidized bed heat storage subsystem further includes a return feeder (28) and a discharging device. The return feeder (28) is used for conveying the materials separated by the cyclone separator (27) to the fluidized bed (26), and the discharging device (211) is arranged at the bottom of the fluidized bed (26).

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