Coal-fired unit and compressed air energy storage coupling system

Abstract

The utility model discloses a coal-fired unit and compressed air energy storage coupling system, and belongs to the technical field of coal-fired power generation. The system comprises a steam turbine, a high-pressure water heat storage tank and a heat supply network heat exchanger. An outlet of the steam turbine is connected with an inlet of the deaerator; if the current scene is a resident heat supply scene and the real-time electricity price is in a low-electricity-price period, a steam turbine exhaust control valve and a heat supply network heat transfer flow control valve are installed between an outlet of a steam turbine and an inlet of a heat supply network heat exchanger, and a high-pressure water flow control valve is installed between an outlet of a high-pressure water heat storage tank and the inlet of the heat supply network heat exchanger; and if the current scene is the resident heat supply scene and the real-time electricity price is in the high electricity price period, a steam turbine exhaust control valve and a heat supply network heat transfer flow control valve are installed between a steam turbine outlet and a high-pressure water heat storage tank inlet and between the steam turbine outlet and a heat supply network heat exchanger inlet correspondingly. According to the utility model, active regulation and control can be carried out under different thermoelectric loads and electricity prices so as to obtain an optimal economical operation strategy.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal-fired power generation technical field especially is a kind of coal-fired unit and compressed air energy storage coupling system. BACKGROUND

[0002] Coal-fired heat and power supply unit usually operates according to "heat determines electricity" mode. When coal-fired unit participates in electricity spot transaction, to meet the needs of residential heating, coal-fired unit load is at high level, and large electricity transaction loss occurs. In industrial heat season, electricity load adjustment space is large, and after coal-fired unit participates in electricity spot transaction, coal-fired unit peak shaving capacity and economic benefit are unstable. Energy storage system coupled with coal-fired unit is considered as a technical solution to improve the flexibility of coal-fired unit. Among them, compressed air energy storage, due to its own heat storage device, is coupled with coal-fired unit to improve the heating flexibility of coal-fired unit and reduce the loss in electricity spot market transaction under the premise of meeting heating demand.

[0003] Coal-fired unit power generation load is affected by power grid dispatching, and electricity load is often in a variable state. Coal-fired unit heating load is in a variable state due to environmental temperature. At the same time, under the electricity spot transaction market, electricity price changes in real time. Therefore, under the condition of simultaneous change of electricity load, heat load and electricity price, it is necessary to develop a suitable coal-fired unit coupling compressed air energy storage system to actively regulate and control the optimal economic operation strategy under different heat and electricity loads and electricity prices. SUMMARY

[0004] The utility model aims at overcoming the deficiency in prior art, and provides a kind of coal-fired unit and compressed air energy storage coupling system, can be under different heat and electricity load and electricity price, actively regulate and control the optimal economic operation strategy.

[0005] To achieve the above-mentioned purpose, the utility model is implemented by the following technical scheme:

[0006] The utility model provides a kind of coal-fired unit and compressed air energy storage coupling system, including steam turbine, high-pressure water heat storage tank and heat network heat exchanger;The steam turbine outlet is connected with the deaerator inlet;

[0007] If the current scene is residential heating scene, and real-time electricity price is in low electricity price period, steam turbine exhaust control valve and heat network heat transfer flow control valve are installed between steam turbine outlet and heat network heat exchanger inlet, and high-pressure water flow control valve is installed between high-pressure water heat storage tank outlet and heat network heat exchanger inlet;

[0008] If the current scene is residential heating scene, and real-time electricity price is in high electricity price period, steam turbine exhaust control valve and heat network heat transfer flow control valve are installed between steam turbine outlet and high-pressure water heat storage tank inlet and between steam turbine outlet and heat network heat exchanger inlet respectively.

[0009] In the utility model, during the low electricity price period of resident heat supply, the heat in the high-pressure water heat storage tank is used to partially replace the coal-fired unit to supply heat to the heat network, and the exhaust of the medium-pressure steam turbine is used to supply heat to the heat network; during the high electricity price period of resident heat supply, a part of the exhaust of the medium-pressure steam turbine is used to heat the high-pressure water heat storage tank, and a part of the exhaust of the medium-pressure cylinder steam turbine is used to exchange heat with the heat network.

[0010] Optionally, if the current scene is a resident heat supply scene and the real-time electricity price is in a low electricity price period, a first water inlet pipeline is installed between the outlet of the heat network heat exchanger and the inlet of the high-pressure water heat storage tank.

[0011] Optionally, the system further comprises a condenser.

[0012] If the current scene is a resident heat supply scene and the real-time electricity price is in a high electricity price period, a second water inlet pipeline is installed between the outlet of the high-pressure water heat storage tank and the inlet of the condenser.

[0013] Optionally, the system further comprises a compressor.

[0014] An inter-stage heat exchanger is installed between adjacent compressors, and each inter-stage heat exchanger is connected to the inlet of the high-pressure water heat storage tank.

[0015] In another aspect, the utility model provides a coal-fired unit and compressed air energy storage coupling system, including steam turbine, high-pressure water heat storage tank and condensate heat exchanger, steam turbine outlet is connected with deaerator inlet,

[0016] If the current scene is an industrial heat supply scene and the real-time electricity price is in a low electricity price period, a steam turbine exhaust control valve is installed between the outlet of the steam turbine and the inlet of the high-pressure water heat storage tank.

[0017] If the current scene is an industrial heat supply scene and the real-time electricity price is in a high electricity price period, a high-pressure water flow control valve is installed between the outlet of the high-pressure water heat storage tank and the inlet of the condensate heat exchanger.

[0018] In the utility model, during the low electricity price period of industrial heat supply, a part of the exhaust of the medium-pressure steam turbine is used to heat the high-pressure water heat storage tank; during the high electricity price period of industrial heat supply, the high-pressure water heat storage tank is used to heat the condensate.

[0019] Optionally, the system further comprises a condenser.

[0020] If the current scene is an industrial heat supply scene and the real-time electricity price is in a low electricity price period, a first water return pipeline is installed between the outlet of the high-pressure water heat storage tank and the inlet of the condenser.

[0021] Optionally, if the current scene is an industrial heating scene, and the real-time electricity price is in a high electricity price period, a condensate water heat exchanger flow control valve is installed between the condenser outlet and the condensate water heat exchanger inlet, and a condensate water flow control valve is installed between the condensate water heat exchanger outlet and the coal-fired unit thermal system.

[0022] Optionally, if the current scene is an industrial heating scene, and the real-time electricity price is in a high electricity price period, a second return water pipeline is installed between the condensate water heat exchanger outlet and the high-pressure water storage tank inlet.

[0023] Optionally, further comprising a compressor;

[0024] Inter-stage heat exchangers are installed between adjacent compressors, and each inter-stage heat exchanger is connected to the high-pressure water storage tank inlet after being connected to each other.

[0025] Compared with the prior art, the utility model has the beneficial effects that:

[0026] 1. The utility model is aimed at resident heating, in a low electricity price period, the heat in the high-pressure water storage tank partially replaces the coal-fired unit to supply heat to the heat network, and the exhaust of the medium-pressure steam turbine supplies heat to the heat network, thereby reducing the power generation load of the coal-fired unit in the low electricity price period, reducing the power generation output of the coal-fired unit in the low electricity price period, and reducing the loss of the coal-fired unit in the low electricity price period, in a high electricity price period, a part of the exhaust of the medium-pressure steam turbine heats the high-pressure water storage tank to supplement the heat storage of the compressed air energy storage system, and a part of the exhaust of the medium-pressure steam turbine exchanges heat with the heat network, so as to restore the high-pressure water to the design temperature.

[0027] 2. The utility model is aimed at industrial heating, in a low electricity price period, the steam production of the unit is increased, a part of the exhaust of the medium-pressure steam turbine is used to heat the high-pressure water storage tank, in a high electricity price period, the heat stored in the high-pressure water is used to heat the condensate water of the coal-fired unit, thereby increasing the power generation of the coal-fired unit, and through energy transfer in different periods, the peak shaving capacity and economic benefit of the coal-fired unit are improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Fig. 1 shows the structure of a coal-fired unit and a compressed air energy storage coupling system in an embodiment of the utility model;

[0029] Figure 2 Fig. 2 shows the structure of a coal-fired unit and a compressed air energy storage coupling system in another embodiment of the utility model;

[0030] Figure 3 Fig. 3 shows a change curve of the power generation of a coal-fired unit in a resident heating season in an embodiment of the utility model before and after coupling;

[0031] Figure 4 Fig. 1 shows a change curve schematic diagram of the net income of the coal-fired unit before and after coupling in a month of the heating season for residents in an embodiment of the utility model;

[0032] Figure 5 Fig. 2 shows a change curve schematic diagram of the power generation of the coal-fired unit before and after coupling in a month of the industrial heat season in an embodiment of the utility model;

[0033] Figure 6 Fig. 3 shows a change curve schematic diagram of the net income of the coal-fired unit before and after coupling in a month of the industrial heat season in an embodiment of the utility model;

[0034] In the figure: 1.1, first compressor; 1.2, second compressor; 1.3, third compressor; 1.4, fourth compressor; 2, inter-stage heat exchanger; 3, high-pressure water storage tank; 4.1, first steam turbine; 4.2, second steam turbine; 4.3, third steam turbine; 4.4, fourth steam turbine; 5, boiler; 6, condenser; 7, deaerator; 8.1, first regenerative heater; 8.2, second regenerative heater; 8.3, third regenerative heater; 8.4, fourth regenerative heater; 8.5, fifth regenerative heater; 8.6, sixth regenerative heater; 8.7, seventh regenerative heater; 9, steam turbine exhaust control valve; 10, heat network heat transfer flow control valve; 11, heat network heat exchanger; 12, generator; 13, condensate heat exchanger; 14, condensate heat exchanger flow control valve; 15, condensate flow control valve; 16, industrial heat supply; 17, high-pressure water flow control valve; 18, low electricity price mode; 19, high electricity price mode. DETAILED DESCRIPTION

[0035] The technical scheme of the utility model will be described in detail below by means of the accompanying drawings and specific embodiments. It should be understood that the embodiments of the utility model and the specific features in the embodiments are detailed descriptions of the technical scheme of the utility model, rather than limitations of the technical scheme of the utility model. In the case of no conflict, the technical features in the embodiments of the utility model and the embodiments can be combined with each other.

[0036] The term "and / or", only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / ", generally represents that the front and rear associated objects are in an "or" relationship.

[0037] Embodiment 1

[0038] As Figure 1As shown, the embodiment introduces a coal-fired unit and compressed air energy storage coupling system. For the residential heating scene, the system includes a compressor, an inter-stage heat exchanger 2, a high-pressure water storage tank 3, a steam turbine, a boiler 5, a condenser 6, a deaerator 7, a regenerative heater, a steam turbine exhaust control valve 9, a heat network heat transfer flow control valve 10, a heat network heat exchanger 11, a generator 12, and a high-pressure water flow control valve 17.

[0039] The compressor in the embodiment includes four, namely the first compressor 1.1, the second compressor 1.2, the third compressor 1.3, and the fourth compressor 1.4. An inter-stage heat exchanger 2 is installed between adjacent two compressors, i.e. the inter-stage heat exchanger 2 is installed between the first compressor 1.1 and the second compressor 1.2, between the second compressor 1.2 and the third compressor 1.3, and between the third compressor 1.3 and the fourth compressor 1.4. The inter-stage heat exchangers 2 are connected to each other and connected to the inlet of the high-pressure water storage tank 3.

[0040] The steam turbine in the embodiment includes four, namely the first steam turbine 4.1, the second steam turbine 4.2, the third steam turbine 4.3, and the fourth steam turbine 4.4. The regenerative heater includes seven, namely the first regenerative heater 8.1, the second regenerative heater 8.2, the third regenerative heater 8.3, the fourth regenerative heater 8.4, the fifth regenerative heater 8.5, the sixth regenerative heater 8.6, and the seventh regenerative heater 8.7. Adjacent two steam turbines are connected to each other, i.e. the first steam turbine 4.1 and the second steam turbine 4.2 are connected to each other, the second steam turbine 4.2 and the third steam turbine 4.3 are connected to each other, and the third steam turbine 4.3 and the fourth steam turbine 4.4 are connected to each other. The first regenerative heater 8.1 and the second regenerative heater 8.2 are connected to each other, the second regenerative heater 8.2 and the third regenerative heater 8.3 are connected to each other, the fourth regenerative heater 8.4 and the fifth regenerative heater 8.5 are connected to each other, the fifth regenerative heater 8.5 and the sixth regenerative heater 8.6 are connected to each other, and the sixth regenerative heater 8.6 and the seventh regenerative heater 8.7 are connected to each other.

[0041] The outlet of the boiler 5 is connected to the inlet of the first steam turbine 4.1 and the inlet of the second steam turbine 4.2. The outlet of the first steam turbine 4.1 is connected to the inlet of the boiler 5, the inlet of the first regenerative heater 8.1, and the inlet of the second regenerative heater 8.2. The outlet of the first regenerative heater 8.1 is connected to the inlet of the boiler 5.

[0042] The outlet of the second steam turbine 4.2 is connected to the inlet of the third regenerative heater 8.3, the inlet of the deaerator 7, the inlet of the third steam turbine 4.3, the inlet of the fourth steam turbine 4.4, and the inlet of the heat network heat exchanger 11. The outlet of the deaerator 7 is connected to the inlet of the third regenerative heater 8.3. The outlet of the third regenerative heater 8.3 is fed back to the inlet of the deaerator 7.

[0043] The third steam turbine 4.3 is connected with the fourth steam turbine 4.4, and the outlet of the third steam turbine 4.3 is connected with the inlet of the fourth regenerative heater 8.4, the inlet of the fifth regenerative heater 8.5, the inlet of the sixth regenerative heater 8.6, the inlet of the seventh regenerative heater 8.7 and the inlet of the condenser 6, and the outlet of the condenser 6 is connected with the inlet of the seventh regenerative heater 8.7, and the outlet of the seventh regenerative heater 8.7 is fed back to the inlet of the condenser 6. After the third steam turbine 4.3 is connected with the fourth steam turbine 4.4, the third steam turbine 4.3 is also connected with the generator 12. The third steam turbine 4.3 is connected with the fourth steam turbine 4.4, and a steam turbine exhaust control valve 9 is arranged between the inlet of the third steam turbine 4.3 and the outlet of the second steam turbine 4.2.

[0044] If the current scene is a resident heating scene, and the real-time electricity price is in a low electricity price period, the steam turbine exhaust control valve 9 is also connected with the heat network heat exchanger 11, and a heat network heat transfer flow control valve 10 is arranged between the steam turbine exhaust control valve 9 and the heat network heat exchanger 11. A high-pressure water flow control valve 17 is arranged between the outlet of the high-pressure water storage tank 3 and the inlet of the heat network heat exchanger 11, and a first water inlet pipeline is arranged between the outlet of the heat network heat exchanger 11 and the inlet of the high-pressure water storage tank 3.

[0045] The high-pressure water flow control valve 17 is used to control the high-pressure water in the high-pressure water storage tank 3 to heat the heat network circulating water of the heat network heat exchanger 11. After heat exchange, the high-pressure water returns to the high-pressure water storage tank 3. The steam turbine exhaust control valve 9 and the heat network heating flow control valve 10 are used to control the medium-pressure steam turbine exhaust to heat the heat network circulating water of the heat network heat exchanger 11. After heat exchange, the steam turbine exhaust returns to the condenser 6.

[0046] If the current scene is a resident heating scene, and the real-time electricity price is in a high electricity price period, the steam turbine exhaust control valve 9 is also connected with the heat network heat exchanger 11, and a heat network heat transfer flow control valve 10 is arranged between the steam turbine exhaust control valve 9 and the heat network heat exchanger 11. The steam turbine exhaust control valve 9 is also connected with the high-pressure water storage tank 3, and a heat network heat transfer flow control valve 10 is arranged between the steam turbine exhaust control valve 9 and the high-pressure water storage tank 3. A second water inlet pipeline is arranged between the outlet of the high-pressure water storage tank 3 and the inlet of the condenser 6. A part of the medium-pressure steam turbine exhaust is used to heat the high-pressure water storage tank 3, and a part of the medium-pressure steam turbine exhaust is used to heat exchange the heat network.

[0047] The steam turbine exhaust control valve 9 and the heat network heating flow control valve 10 are used to control the medium-pressure steam turbine exhaust to heat the high-pressure water storage tank 3. After heat exchange, the steam turbine exhaust returns to the condenser 6.

[0048] In this embodiment, the medium in the compressor is air, the temperature and pressure of the air increase after being compressed by the compressor, the compression heat is collected by the inter-stage heat exchanger 2 and stored in the high-pressure water storage tank 3; the medium-pressure cylinder exhaust is used to heat the heat network circulating water to provide the heating capacity of the coal-fired unit, and the heat stored in the high-pressure water storage tank 3 can be partially used to heat the heat network circulating water, partially replacing the heating capacity of the thermal power unit, and the medium-pressure stage exhaust steam of the steam turbine can heat the high-pressure water to restore the high-pressure water to the design temperature.

[0049] During the low electricity price period of resident heating, the medium-pressure cylinder exhaust passes through the steam turbine exhaust control valve 9, part of which enters the low-pressure cylinder to continue to work, and the rest passes through the heat network heat transfer flow control valve 10 and exchanges heat with the heat network circulating water, and the high-pressure water flows through the heat network heat exchanger 11 and exchanges heat with the heat network circulating water through the high-pressure water flow control valve 17.

[0050] During the high electricity price period of resident heating, the medium-pressure cylinder exhaust passes through the steam turbine exhaust control valve 9, part of which enters the low-pressure cylinder to continue to work, and the rest flows through the heat network heat transfer flow control valve 10 and exchanges heat with the high-pressure water storage tank 3 to supplement the heat in the high-pressure water to the design value.

[0051] The high-pressure water part of the coal-fired unit coupled with the compressed air energy storage system is used to obtain the optimal economic regulation and control strategy of the coal-fired unit coupled with the compressed air energy storage system under different thermal power load and electricity price conditions in the resident heating season, and to reduce the loss of the coal-fired unit in the low electricity price period.

[0052] Embodiment 2

[0053] As shown in Figure 2 , this embodiment introduces a coal-fired unit and compressed air energy storage coupled system, which is aimed at the industrial heating scene, and the system includes a compressor, an inter-stage heat exchanger 2, a high-pressure water storage tank 3, a steam turbine, a boiler 5, a condenser 6, a deaerator 7, a regenerative heater, a steam turbine exhaust control valve 9, a generator 12, a condensate heat exchanger 13, a condensate heat exchanger flow control valve 14, a condensate flow control valve 15, and a high-pressure water flow control valve 17.

[0054] The compressor in this embodiment includes four, which are the first compressor 1.1, the second compressor 1.2, the third compressor 1.3, and the fourth compressor 1.4. An inter-stage heat exchanger 2 is installed between adjacent two compressors, that is, an inter-stage heat exchanger 2 is installed between the first compressor 1.1 and the second compressor 1.2, an inter-stage heat exchanger 2 is installed between the second compressor 1.2 and the third compressor 1.3, and an inter-stage heat exchanger 2 is installed between the third compressor 1.3 and the fourth compressor 1.4. The inter-stage heat exchangers 2 are connected with each other and connected with the inlet of the high-pressure water storage tank 3.

[0055] The steam turbine of the embodiment includes four, namely the first steam turbine 4.1, the second steam turbine 4.2, the third steam turbine 4.3 and the fourth steam turbine 4.4, and the regenerative heater includes seven, namely the first regenerative heater 8.1, the second regenerative heater 8.2, the third regenerative heater 8.3, the fourth regenerative heater 8.4, the fifth regenerative heater 8.5, the sixth regenerative heater 8.6 and the seventh regenerative heater 8.7; two adjacent steam turbines are connected to each other, that is, the first steam turbine 4.1 and the second steam turbine 4.2 are connected to each other, the second steam turbine 4.2 and the third steam turbine 4.3 are connected to each other, and the third steam turbine 4.3 and the fourth steam turbine 4.4 are connected to each other; the first regenerative heater 8.1 and the second regenerative heater 8.2 are connected to each other, the second regenerative heater 8.2 and the third regenerative heater 8.3 are connected to each other, the fourth regenerative heater 8.4 and the fifth regenerative heater 8.5 are connected to each other, the fifth regenerative heater 8.5 and the sixth regenerative heater 8.6 are connected to each other, and the sixth regenerative heater 8.6 and the seventh regenerative heater 8.7 are connected to each other;

[0056] The outlet of the boiler 5 is connected to the inlet of the first steam turbine 4.1 and the inlet of the second steam turbine 4.2, respectively; the outlet of the first steam turbine 4.1 is connected to the inlet of the boiler 5, the inlet of the first regenerative heater 8.1 and the inlet of the second regenerative heater 8.2, respectively; and the outlet of the first regenerative heater 8.1 is connected to the inlet of the boiler 5.

[0057] The outlet of the second steam turbine 4.2 is connected to the inlet of the third regenerative heater 8.3, the inlet of the deaerator 7, the inlet of the third steam turbine 4.3 and the inlet of the fourth steam turbine 4.4, respectively; the outlet of the deaerator 7 is connected to the inlet of the third regenerative heater 8.3; and the outlet of the third regenerative heater 8.3 is fed back to the inlet of the deaerator 7.

[0058] After the third steam turbine 4.3 and the fourth steam turbine 4.4 are communicated, the outlet thereof is connected to the inlet of the fourth regenerative heater 8.4, the inlet of the fifth regenerative heater 8.5, the inlet of the sixth regenerative heater 8.6, the inlet of the seventh regenerative heater 8.7 and the inlet of the condenser 6, respectively; the outlet of the condenser 6 is connected to the inlet of the seventh regenerative heater 8.7; the outlet of the seventh regenerative heater 8.7 is fed back to the inlet of the condenser 6; after the third steam turbine 4.3 and the fourth steam turbine 4.4 are communicated, the third steam turbine 4.3 and the fourth steam turbine 4.4 are further connected to the generator 12; and after the third steam turbine 4.3 and the fourth steam turbine 4.4 are communicated, a steam turbine exhaust control valve 9 is arranged between the inlet of the third steam turbine 4.3 and the outlet of the second steam turbine 4.2.

[0059] If the current scene is an industrial heating scene and the real-time electricity price is in a low electricity price period, the steam turbine exhaust control valve 9 is further connected to the high-pressure water storage tank 3; and a first backwater pipeline is arranged between the outlet of the high-pressure water storage tank 3 and the inlet of the condenser 6.

[0060] The steam turbine exhaust control valve 9 is used to control the medium-pressure steam turbine exhaust to heat the high-pressure water storage tank 3, and the heat-exchanged steam turbine exhaust returns to the condenser 6.

[0061] If the current scene is an industrial heating scene and the real-time electricity price is in a high electricity price period, a condensate water flow control valve 15 is installed between the outlet of the condensate water heat exchanger 13 and the thermal system of the coal-fired unit, that is, a condensate water flow control valve 15 is installed between the outlet of the condensate water heat exchanger 13 and the inlet of the deaerator 7, the condensate water flow control valve 15 is connected to the inlet of the fourth regenerative heater 8.4, a high-pressure water flow control valve 17 is installed between the outlet of the high-pressure water storage tank 3 and the inlet of the condensate water heat exchanger 13, a condensate water heat exchanger flow control valve 14 is installed between the outlet of the condenser 6 and the inlet of the condensate water heat exchanger 13, and a second return water pipeline is installed between the outlet of the condensate water heat exchanger 13 and the inlet of the high-pressure water storage tank 3;

[0062] The high-pressure water flow control valve 17 is used to control the high-pressure water in the high-pressure water storage tank 3 to heat the condensate water in the condensate water heat exchanger 13, and the heat-exchanged high-pressure water returns to the high-pressure water storage tank 3. The condensate water heat exchanger flow control valve 14 is used to control the condensate water to enter the condensate water heat exchanger 13, and the heat-exchanged condensate water returns to the thermal system of the coal-fired unit through the condensate water flow control valve 15.

[0063] In this embodiment, the high-pressure water can heat the condensate water, and the power of the thermal power unit is improved by extracting steam from the steam turbine. The exhaust gas of the medium-pressure cylinder is used to heat the high-pressure water to restore the high-pressure water to the design temperature.

[0064] During the low electricity price period of industrial heating, the exhaust gas of the medium-pressure cylinder passes through the steam turbine exhaust control valve 9, part of which enters the low-pressure cylinder to continue to do work, and the rest exchanges heat with the high-pressure water storage tank 3 to supplement the heat in the high-pressure water to the design value, and industrial heating is performed through the industrial heating 16.

[0065] During the high electricity price period of industrial heating, the condensate water enters the condensate water heat exchanger 13 through the condensate water heat exchanger flow control valve 14, the heat-exchanged and warmed condensate water returns to the thermal system of the coal-fired unit through the condensate water flow control valve 15, the high-pressure water exchanges heat with the condensate water in the condensate water heat exchanger 13 through the high-pressure water flow control valve 17, and the heat-exchanged high-pressure water returns to the high-pressure water storage tank 3, and industrial heating is performed through the industrial heating 16.

[0066] The coal-fired unit coupled with the compressed air energy storage system is used to improve the peak shaving capacity and economic benefits of the coal-fired unit through energy transfer in different periods.

[0067] Embodiment 3

[0068] Based on the same concept as embodiment 1, this embodiment introduces a specific test example of a coal-fired unit coupled with a compressed air energy storage system, which includes:

[0069] Taking a month of a resident heating season as an example, the unit power generation and economic change of the coal-fired unit coupled with compressed air energy storage are analyzed, and the unit power generation and economic change curve of the coal-fired unit coupled with compressed air energy storage after the resident heating season are respectively as shown in Figure 3 、 Figure 4 .

[0070] As shown in Figure 3 , from 10:00 to 16:00, the electricity spot price is low at this time, and after the coal-fired unit is coupled with compressed air energy storage, the unit power generation is reduced from 112.5 MW to 77.1 MW. Due to the reduction of power generation at this time, the coal consumption of the coal-fired unit is reduced, as shown in Figure 4 , at 10:00, the net income of the unit is increased from-26907.14 yuan to-18637.31 yuan. On the heating day, the net income of the coal-fired unit is increased from 893310.05 yuan to 934202.78 yuan.

[0071] Embodiment 4

[0072] Based on the same concept as Embodiment 2, this embodiment introduces a specific test example of a coal-fired unit coupled with compressed air energy storage system, including:

[0073] The unit power generation and economic change of the coal-fired unit coupled with compressed air energy storage after the industrial heating season are respectively as shown in Figure 5 、 Figure 6 . On the basis of ensuring industrial heating, the steam production of the unit is appropriately increased at low electricity price period, and at low electricity price period from 10:00 to 16:00, the high-pressure thermal storage water stores heat of 36.8 MW / h, and at high electricity price period from 18:00 to 21:00, the heat stored in the high-pressure water is used to heat the coal-fired unit condensate water, and the unit power generation is increased by 13.085 MW / h. As shown in Figure 6 , the system generates more power by 112.87 MW at low electricity price period, and the system benefit is reduced by 42091.05 yuan at this time, the system generates more power by 74.96 MW at high electricity price period, and the benefit is increased by 65425 yuan at this time, and the system benefit is increased by 23333.95 yuan on the whole heating day.

[0074] The embodiments of the utility model are described above in combination with the drawings, but the utility model is not limited to the above specific embodiments, and the above specific embodiments are only illustrative but not restrictive, and those skilled in the art can make many forms under the inspiration of the utility model without departing from the purpose of the utility model and the scope protected by the claims, and these all belong to the protection of the utility model.

Claims

1. A coal-fired power unit coupled with compressed air energy storage system, characterized in that, It includes a steam turbine, a high-pressure water storage tank, and a heat exchanger for a heat network; the steam turbine outlet is connected to the deaerator inlet; If the current scenario is a residential heating scenario and the real-time electricity price is during a low electricity price period, a turbine exhaust control valve and a heat network heat transfer flow control valve are installed between the turbine outlet and the heat exchanger inlet, and a high-pressure water flow control valve is installed between the high-pressure water storage tank outlet and the heat exchanger inlet. If the current scenario is a residential heating scenario and the real-time electricity price is during a high electricity price period, a steam turbine exhaust control valve and a heat network heat transfer flow control valve are installed between the steam turbine outlet and the high-pressure water storage tank inlet, and between the steam turbine outlet and the heat network heat exchanger inlet, respectively.

2. The coal-fired power unit and compressed air energy storage coupling system according to claim 1, characterized in that, If the current scenario is a residential heating scenario and the real-time electricity price is during a low electricity price period, a first water inlet pipe is installed between the outlet of the heat exchanger and the inlet of the high-pressure water storage tank.

3. The coal-fired power unit and compressed air energy storage coupling system according to claim 1, characterized in that, It also includes condensers; If the current scenario is a residential heating scenario and the real-time electricity price is during a high electricity price period, a second water inlet pipe is installed between the outlet of the high-pressure water storage tank and the inlet of the condenser.

4. The coal-fired power unit and compressed air energy storage coupling system according to claim 1, characterized in that, It also includes the air compressor; Interstage heat exchangers are installed between adjacent compressors, and each interstage heat exchanger is interconnected and then connected to the inlet of the high-pressure water storage tank.

5. A coal-fired power unit coupled with compressed air energy storage system, characterized in that, It includes a steam turbine, a high-pressure water storage tank, and a condensate heat exchanger; the steam turbine outlet is connected to the deaerator inlet; If the current scenario is an industrial heating scenario and the real-time electricity price is during a low electricity price period, a steam turbine exhaust control valve is installed between the steam turbine outlet and the high-pressure water storage tank inlet; If the current scenario is an industrial heating scenario and the real-time electricity price is during a period of high electricity price, a high-pressure water flow control valve is installed between the outlet of the high-pressure water heat storage tank and the inlet of the condensate heat exchanger.

6. The coal-fired power unit and compressed air energy storage coupling system according to claim 5, characterized in that, It also includes condensers; If the current scenario is an industrial heating scenario and the real-time electricity price is during a low electricity price period, a first return water pipeline is installed between the outlet of the high-pressure water storage tank and the inlet of the condenser.

7. The coal-fired power unit and compressed air energy storage coupling system according to claim 6, characterized in that, If the current scenario is an industrial heating scenario and the real-time electricity price is during a high electricity price period, a condensate heat exchanger flow control valve is installed between the condenser outlet and the condensate heat exchanger inlet, and a condensate flow control valve is installed between the condensate heat exchanger outlet and the coal-fired unit thermal system.

8. The coal-fired power unit and compressed air energy storage coupling system according to claim 5, characterized in that, If the current scenario is an industrial heating scenario and the real-time electricity price is during a period of high electricity price, a second return water pipeline is installed between the outlet of the condensate heat exchanger and the inlet of the high-pressure water storage tank.

9. The coal-fired power unit and compressed air energy storage coupling system according to claim 5, characterized in that, It also includes the air compressor; Interstage heat exchangers are installed between adjacent compressors, and each interstage heat exchanger is interconnected and then connected to the inlet of the high-pressure water storage tank.

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