Compressed air energy storage and thermal power energy supply-based comprehensive energy supply system and control method

Abstract

The invention provides a comprehensive energy supply system based on compressed air energy storage and thermal power energy supply and a control method. The comprehensive energy supply system comprises a thermal power generating unit energy supply device, a compressed air energy storage device, an air expansion acting device and a heat storage device. The thermal power generating unit energy supply device, the compressed air energy storage device and the air expansion acting device are sequentially connected, electric energy generated by the thermal power generating unit energy supply device drives the compressed air energy storage device, and the heat storage device is connected with the thermal power generating unit energy supply device, the compressed air energy storage device and the air expansion acting device in an on-off mode. When the comprehensive energy supply system needs peak regulation, the compressed air energy storage device is started to store energy, and the on-grid electric quantity of the comprehensive energy supply system is reduced; when the comprehensive energy supply system needs a peak, the air expansion acting device is started to act and generate power, and the on-grid electric quantity of the comprehensive energy supply system is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage and energy supply, and in particular to an integrated energy supply system and energy supply control method based on compressed air energy storage and thermal power supply. Background Art

[0002] Under the background of the construction of a new generation of coal-fired power, cogeneration units face difficulties in heat-electric decoupling in winter, high back pressure of the units, and limited output in summer. For example, the demand for heating is high in winter, while the demand for electricity is relatively low. While meeting the heating demand, cogeneration units find it difficult to flexibly adjust the power generation, which makes heat-electric decoupling more difficult. For example, in extremely cold weather, in order to ensure heating for residents, the units may need to operate at a higher heat load, but at this time the demand in the electricity market is insufficient and the excess electricity cannot be effectively absorbed. The temperature is high in summer, and the cooling water temperature also rises accordingly, resulting in an increase in the back pressure of the unit. The increase in back pressure will reduce the work capacity of the steam turbine, thereby limiting the output of the unit and causing a significant drop in the power generation of the unit. Summary of the invention

[0003] In view of this, the present application provides an integrated energy supply system and energy supply control method based on compressed air energy storage and thermal power supply to solve the above-mentioned technical problems.

[0004] In a first aspect, an embodiment of the present application provides a comprehensive energy supply system based on compressed air energy storage and thermal power supply, including:

[0005] A thermal power generation unit energy supply device (100), a compressed air energy storage device (200), an air expansion working device (300), and a heat storage device (9); the thermal power generation unit energy supply device (100), the compressed air energy storage device (200), and the air expansion working device (300) are connected in sequence, the electric energy generated by the thermal power generation unit energy supply device (100) drives the compressed air energy storage device (200), and the heat storage device (9) is connected and disconnected with the thermal power generation unit energy supply device (100), the compressed air energy storage device (200), and the air expansion working device (300) respectively;

[0006] When the comprehensive energy supply system needs to be peak-shifted, the compressed air energy storage device (200) is activated to store energy, thereby reducing the amount of electricity connected to the grid by the comprehensive energy supply system; when the comprehensive energy supply system needs to be peak-shifted, the air expansion work device (300) is activated to generate electricity, thereby increasing the amount of electricity connected to the grid by the comprehensive energy supply system.

[0007] According to the above system of the embodiment of the present application, the following additional technical features may also be provided:

[0008] In the above technical solution, optionally, the thermal power unit energy supply device (100) comprises: a thermal power unit steam turbine (1) and a thermal power unit generator (2);

[0009] The compressed air energy storage device (200) comprises: an air compressor (3), a first heat exchanger (4), an air storage device (5), and a valve (14) and a valve (15) arranged between the first heat exchanger (4) and the heat storage device (9);

[0010] The air expansion working device (300) comprises: a second heat exchanger (6), an air expander (7), a compressed air generator (8), and a valve (16) and a valve (17) arranged between the second heat exchanger (6) and the heat storage device (9);

[0011] The steam turbine (1) of the thermal power unit, the generator (2) of the thermal power unit, the air compressor (3), the first heat exchanger (4), the air storage device (5), the second heat exchanger (6), the air expander (7) and the compressed air generator (8) are connected in sequence;

[0012] When the integrated energy supply system needs to be peak-loaded, the electric energy generated by the thermal power generator (2) drives the air compressor (3), and the high-pressure air discharged from the air compressor (3) passes through the first heat exchanger (4), and the heat generated during the compression process is released to the heat storage device (9), and the air after heat release enters the air storage device (5); when the integrated energy supply system needs to be peak-loaded, the high-pressure air first passes through the heat exchanger 6 to absorb heat, and then enters the air expander (7) to perform work, thereby driving the compressed air generator (8) to generate electricity;

[0013] The integrated energy supply system further comprises: a valve (11) arranged between a steam turbine (1) of a thermal power unit and a heat user device (10), a valve (12) arranged between a heat storage device (9) and the steam turbine (1) of the thermal power unit, and a valve (13) arranged between the heat storage device (9) and the heat user device (10).

[0014] In any of the above technical solutions, optionally, the heat storage device (9) stores heat extracted from the steam turbine (1) of the thermal power unit, and / or the heat storage device (9) stores heat generated by the air compressor (3) during the air compression process.

[0015] In any of the above technical solutions, optionally, the heat stored in the heat storage device (9) is released to the heat user equipment (10), and / or released to the high-pressure air before entering the air expander (7).

[0016] In any of the above technical solutions, optionally, the first heat exchanger (4) and the second heat exchanger (6) are air-water heat exchangers;

[0017] The gas storage device (5) stores gas in any one of salt cavern gas storage, pressure tank gas storage, and artificial chamber gas storage;

[0018] The heat storage device (9) is a pressure-bearing device, and the medium in the heat storage device (9) is water.

[0019] In a second aspect, an embodiment of the present application provides an energy supply control method, which is applied to an integrated energy supply system based on compressed air energy storage and thermal power supply, and the method includes:

[0020] According to the real-time power generation load demand and heating load demand, the operation mode of the thermal power unit power supply device (100), the compressed air energy storage device (200) and the air expansion working device (300) of the comprehensive energy supply system is adjusted, wherein the operation mode includes: when the comprehensive energy supply system needs to be peak-shifted, the compressed air energy storage device (200) is activated to store energy to reduce the online power of the comprehensive energy supply system; when the comprehensive energy supply system needs to be peak-shifted, the air expansion working device (300) is activated to generate power to increase the online power of the comprehensive energy supply system.

[0021] According to the above method of the embodiment of the present application, the following additional technical features may also be provided:

[0022] In the above technical solution, optionally, according to the real-time power generation load demand and heating load demand, the operation mode of the thermal power unit energy supply device (100), the compressed air energy storage device (200) and the air expansion working device (300) of the comprehensive energy supply system is adjusted, including:

[0023] When the power generation load demand is less than the first threshold value and the heating load demand is less than the second threshold value, the air compressor (3) is started, the valve (14) and the valve (15) are opened, the valve (11) and the valve (12) are opened, and the valve (13), the valve (16) and the valve (17) are closed;

[0024] By compressing and pressurizing air to an air storage device (5), the online power of a thermal power generator (2) is reduced, and steam is extracted from a steam turbine (1) of the thermal power unit. The heat extracted from the steam turbine (1) of the thermal power unit and the heat generated during the compression process are stored in a heat storage device (9).

[0025] In any of the above technical solutions, optionally, according to the real-time power generation load demand and heating load demand, the operation mode of the thermal power unit energy supply device (100), the compressed air energy storage device (200) and the air expansion working device (300) of the comprehensive energy supply system is adjusted, including:

[0026] When the power generation load demand is less than the first threshold value and the heating load demand is greater than or equal to the second threshold value, the air compressor (3) is started, the valve (14), the valve (15) and the valve (11) are opened, the valve (12) is closed, the valve (13) is opened, and the valve (16) and the valve (17) are closed;

[0027] By compressing and boosting the air pressure to the gas storage device (5), the grid-connected power of the thermal power generator (2) is reduced, and at the same time, the heat stored in the heat storage device (9) is released to the heat user equipment (10).

[0028] In any of the above technical solutions, optionally, according to the real-time power generation load demand and heating load demand, the operation mode of the thermal power unit energy supply device (100), the compressed air energy storage device (200) and the air expansion working device (300) of the comprehensive energy supply system is adjusted, including:

[0029] When the power generation load demand is greater than or equal to the first threshold value and the heating load demand is less than the second threshold value, valve (14) and valve (15) are closed, valve (11) and valve (12) are opened, valve (13) is closed, and valve (16) and valve (17) are opened;

[0030] The air compressor (3) is stopped, the air expander (7) is started, and the compressed air generator (8) is driven to generate electricity, and at the same time, the heat in the heat storage device (9) is used to heat the air before it enters the air expander (7);

[0031] The valve (11), valve (12) and valve (13) are adjusted according to actual heating demand to control the steam extraction amount of the steam turbine (1) of the thermal power unit.

[0032] In any of the above technical solutions, optionally, according to the real-time power generation load demand and heating load demand, the operation mode of the thermal power unit energy supply device (100), the compressed air energy storage device (200) and the air expansion working device (300) of the comprehensive energy supply system is adjusted, including:

[0033] When the power generation load demand is greater than or equal to the first threshold value and the heating load demand is greater than or equal to the second threshold value, close valve (14) and valve (15), open valve (11), close valve (12), open valve (13), and open valve (16) and valve (17);

[0034] The air compressor (3) is shut down, the air expander (7) is started, the compressed air generator (8) is driven to generate electricity, and the heat in the heat storage device (9) is released to the heat user equipment (10), so as to reduce the steam extraction amount of the steam turbine (1) of the thermal power unit and improve the working capacity of the steam turbine (1) of the thermal power unit.

[0035] In the embodiment of the present application, the compressed air energy storage and the energy supply and operation characteristics of the thermal power unit can be coupled, and the complementary advantages of the thermal power unit and the compressed air energy storage power generation can be fully utilized. When the system needs to shave peak, the compressed air energy storage device (200) is activated to reduce the amount of electricity on the grid. When the system needs to peak, the air expansion work device (300) is activated to increase the amount of electricity on the grid of the system. Based on the existing thermal power peak shaving boundary, the present application can increase the peak shaving depth of the unit (until zero output) and increase the peak output of the unit.

[0036] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0038] Figure 1 A structural schematic diagram of an integrated energy supply system based on compressed air energy storage and thermal power supply according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0040] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0041] In conjunction with the accompanying drawings, the integrated energy supply system and energy supply control method based on compressed air energy storage and thermal power supply provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0042] The embodiment of the present application provides a comprehensive energy supply system based on compressed air energy storage and thermal power supply, such as Figure 1 As shown, the integrated energy supply system includes:

[0043] A thermal power generation unit energy supply device (100), a compressed air energy storage device (200), an air expansion working device (300) and a heat storage device (9); the thermal power generation unit energy supply device (100), the compressed air energy storage device (200) and the air expansion working device (300) are connected in sequence, the electric energy generated by the thermal power generation unit energy supply device (100) drives the compressed air energy storage device (200), and the heat storage device (9) is respectively connected to the thermal power generation unit energy supply device (100), the compressed air energy storage device (200) and the air expansion working device (300).

[0044] The compressed air energy storage device (200) in the present application drives the electric energy to generate electricity from the thermal power unit energy supply device (100). When the comprehensive energy supply system needs to be peak-shifted, the compressed air energy storage device (200) is activated to store the energy generated by the thermal power unit energy supply device (100), thereby reducing the amount of electricity connected to the grid of the comprehensive energy supply system; when the comprehensive energy supply system needs to be peak-shifted, the air expansion work device (300) is activated, and the heat stored in the heat storage device (9) is released to the high-pressure air, and the high-pressure air then enters the air expansion work device (300) to generate electricity, thereby increasing the amount of electricity connected to the grid of the comprehensive energy supply system.

[0045] The present application can couple the energy supply and operation characteristics of compressed air energy storage and thermal power generation units, and can give full play to the complementary advantages of thermal power generation units and compressed air energy storage power generation. When the system needs to shave peak power, the compressed air energy storage device (200) is activated to reduce the amount of electricity on the grid. When the system needs to shave peak power, the air expansion work device (300) is activated to increase the amount of electricity on the grid of the system. Based on the existing thermal power peak shaving boundary, the present application can increase the peak shaving depth of the unit (until zero output) and increase the peak output of the unit.

[0046] In one embodiment of the present application, Figure 1 As shown, the thermal power unit energy supply device (100) comprises: a thermal power unit steam turbine (1) and a thermal power unit generator (2);

[0047] The compressed air energy storage device (200) comprises: an air compressor (3), a first heat exchanger (4), an air storage device (5), and a valve (14) and a valve (15) arranged between the first heat exchanger (4) and the heat storage device (9);

[0048] The air expansion working device (300) comprises: a second heat exchanger (6), an air expander (7), a compressed air generator (8), and a valve (16) and a valve (17) arranged between the second heat exchanger (6) and the heat storage device (9);

[0049] The steam turbine (1) of the thermal power unit, the generator (2) of the thermal power unit, the air compressor (3), the first heat exchanger (4), the air storage device (5), the second heat exchanger (6), the air expander (7) and the compressed air generator (8) are connected in sequence.

[0050] The first heat exchanger (4) and the second heat exchanger (6) are air-water heat exchangers.

[0051] The optional modes of the gas storage device (5) include salt cavern gas storage, pressure tank gas storage, artificial chamber gas storage, etc. The capacity and pressure parameters of the gas storage device (5) can be selected according to the peak load demand of the actual project, thereby determining the capacity and parameter level of the air compressor (3) and the air expander (7).

[0052] When the integrated energy supply system needs to be peaked, the electric energy generated by the generator (2) of the thermal power unit drives the air compressor (3), and the high-pressure air discharged from the air compressor (3) passes through the first heat exchanger (4), and the heat generated in the compression process is released to the heat storage device (9), and the air after heat release enters the air storage device (5); when the integrated energy supply system needs to be peaked, the high-pressure air first passes through the heat exchanger 6 to absorb heat, and then enters the air expansion machine (7) to perform work, thereby driving the compressed air generator (8) to generate electricity.

[0053] The integrated energy supply system further comprises: a valve (11) arranged between the steam turbine (1) of the thermal power unit and the heat user equipment (10), a valve (12) arranged between the heat storage device (9) and the steam turbine (1) of the thermal power unit, and a valve (13) arranged between the heat storage device (9) and the heat user equipment (10). The valve (11) controls the on-off between the steam turbine (1) of the thermal power unit and the heat user equipment (10), so that the thermal power unit supplies heat to the heat user equipment (10). The valve (12) controls the on-off between the heat storage device (9) and the steam turbine (1) of the thermal power unit, so that the heat storage device (9) stores the extracted steam heat of the thermal power unit. The valve (13) controls the on-off between the heat storage device (9) and the heat user equipment (10), so that the heat storage device (9) supplies heat to the heat user equipment (10).

[0054] In one embodiment of the present application, the heat storage device (9) stores the heat extracted from the steam turbine (1) of the thermal power unit, and / or the heat storage device (9) stores the heat generated by the air compressor (3) during the air compression process. In other words, the heat storage device (9) can store both the heat extracted from the thermal power unit and the heat generated by the air during the compression process. The waste heat generated during the power generation process is collected by the heat storage device (9) for heating, thereby realizing the utilization of energy and greatly improving the comprehensive utilization efficiency of energy.

[0055] The heat stored in the heat storage device (9) is released to the heat user equipment (10) and / or to the high-pressure air before entering the air expander (7). The heat stored in the heat storage device (9) is released to the heat user equipment (10) to provide heat for the heat user equipment (10) and improve the heating capacity. The heat stored in the heat storage device (9) can also be released to the high-pressure air before entering the air expander (7) to realize the work and power generation of the air expander (7). The heat released by the heat storage device (9) can reduce the steam extraction of the steam turbine and improve the work capacity of the steam turbine unit.

[0056] This application can increase the peak-shaving depth of the unit (until zero output) and increase the top peak output of the unit, while improving the heat supply guarantee capability of the power generation enterprise.

[0057] In one embodiment, the heat storage device (9) is a pressure-bearing device, and water is recommended as the medium. The outlet hot water temperature is 150°C, and the return cold water temperature is 25°C. The hot water storage tank is 20000m 3 .

[0058] In summary, the embodiments of the present application are Figure 1 The start and stop of each component and the on-off control of each valve in the integrated energy supply system are realized to realize the control of the online power of the integrated energy supply system and the heat supply to the heat user equipment (10). On the basis of the existing peak load and peak limit boundaries of the thermal power units, the peak load capacity (until the online power is 0) and the peak load capacity can be increased. At the same time, the heat storage equipment can be used to store the heat of the thermal power unit steam extraction and the heat generated in the compression process, thereby improving the overall heating capacity and heating flexibility of the system.

[0059] The integrated energy supply system can perform motion control according to the real-time power generation load and heating load of the integrated energy supply system. In actual application, the steam extraction amount of the steam turbine, the heat release rate of the heat storage device, and the start and stop of the compressor and expander under different power generation and heating conditions can be determined by calculation and testing.

[0060] The embodiment of the present application provides an energy supply control method, which is applied to the comprehensive energy supply system based on compressed air energy storage and thermal power supply in the above embodiment. The energy supply control method includes:

[0061] According to the real-time power generation load demand and heating load demand, the operation mode of the thermal power unit energy supply device (100), the compressed air energy storage device (200) and the air expansion work device (300) of the comprehensive energy supply system is adjusted. The operation mode includes:

[0062] When the comprehensive energy supply system needs to be peak-shifted, the compressed air energy storage device (200) is activated to store energy, thereby reducing the amount of electricity connected to the grid by the comprehensive energy supply system; when the comprehensive energy supply system needs to be peak-shifted, the air expansion work device (300) is activated to generate electricity, thereby increasing the amount of electricity connected to the grid by the comprehensive energy supply system.

[0063] The embodiment of the present application can couple the energy supply and operation characteristics of the compressed air energy storage and the thermal power unit, and can give full play to the complementary advantages of the thermal power unit and the compressed air energy storage power generation. When the system needs to shave peak, the compressed air energy storage device (200) is activated to reduce the amount of electricity on the grid. When the system needs to shave peak, the air expansion work device (300) is activated to increase the amount of electricity on the grid of the system. Based on the existing thermal power peak shaving boundary, the present application can increase the peak shaving depth of the unit (until zero output) and increase the peak output of the unit.

[0064] For example, the steam turbine (1) of the thermal power unit is a 600MW subcritical steam turbine. The thermal power unit is a cogeneration unit, and the low-pressure cylinder cutting heating transformation is carried out. After the cylinder cutting, the minimum electrical load of the unit is about 120MW, and the maximum steam extraction heating capacity is about 1200t / h. The compressed air energy storage uses a 120MW compressor and a 120MW expander. The gas storage device uses a fully artificial underground gas storage, the maximum gas storage pressure is selected to be 10MW, and the capacity is 100,000m 3 .

[0065] In one embodiment of the present application, according to the real-time power generation load demand and the heating load demand, the operation mode of the thermal power unit energy supply device (100), the compressed air energy storage device (200) and the air expansion working device (300) of the comprehensive energy supply system is adjusted, including:

[0066] When the power generation load demand is less than a first threshold value and the heating load demand is less than a second threshold value, the air compressor (3) is started, valves (14) and (15) are opened, valves (11) and (12) are opened, and valves (13), (16) and (17) are closed; the online power of the generator (2) of the thermal power unit is reduced by compressing and pressurizing the air to the air storage device (5), and steam is extracted from the steam turbine (1) of the thermal power unit, and the heat extracted from the steam turbine (1) of the thermal power unit and the heat generated during the compression process are stored in the heat storage device (9).

[0067] In this embodiment, when the power generation load demand is low and the heating load demand is low, the air compressor (3) is started, valves (14) and (15) are opened, valves (11) and (12) are opened, valves (13) are closed, and valves (16) and (17) are closed. By compressing and boosting the air to the air storage device (5), the low-pressure cylinder of the steam turbine (1) of the thermal power unit is cut off and operated, and its minimum output can be 120MW. At this time, the heating capacity of the steam turbine (1) of the thermal power unit is about 300MW. After driving the air compressor (3), the grid-connected power of the whole plant is 0, which can be maintained for 3 hours, that is, the total energy storage capacity is 360MWh. At the same time, the amount of steam extraction heat of the steam turbine (1) of the thermal power unit that enters the heat storage device (9) is determined according to the specific value of the heat load, and the heat generated during the compression process is stored in the heat storage device (9). The maximum heat storage capacity is 10300GJ, thereby realizing energy storage.

[0068] In one embodiment of the present application, according to the real-time power generation load demand and the heating load demand, the operation mode of the thermal power unit energy supply device (100), the compressed air energy storage device (200) and the air expansion working device (300) of the comprehensive energy supply system is adjusted, including:

[0069] When the power generation load demand is less than a first threshold value and the heating load demand is greater than or equal to a second threshold value, the air compressor (3) is started, valves (14), (15) and (11) are opened, valve (12) is closed, valve (13) is opened, and valves (16) and (17) are closed; the online power of the thermal power generator (2) is reduced by compressing and pressurizing the air to the air storage device (5), and at the same time, the heat stored in the heat storage device (9) is released to the heat user equipment (10).

[0070] In this embodiment, when the power generation load demand is low and the heating load demand is high, the air compressor (3) is started, valves (14) and (15) are opened, valve (11) is opened, valve (12) is closed, valve (13) is opened, valve (16) and valve (17) are closed. The air is compressed to increase the pressure of the air and stored in the gas storage device (5), thereby reducing the online power of the thermal power unit. The online power of the whole plant is 0, which can be maintained for 3 hours, that is, the total energy storage capacity is 360MWh; at the same time, according to the specific value of the heat load, the amount of steam extraction heat of the thermal power unit turbine (1) entering the heat storage device (9) is reduced, and more heat is supplied to the heat user equipment (10). At the same time, the heat stored in the heat storage device (9) can be released to the heat user equipment (10), and a maximum of 10300GJ of heat release can be provided to ensure the heating capacity.

[0071] In one embodiment of the present application, according to the real-time power generation load demand and the heating load demand, the operation mode of the thermal power unit energy supply device (100), the compressed air energy storage device (200) and the air expansion working device (300) of the comprehensive energy supply system is adjusted, including:

[0072] When the power generation load demand is greater than or equal to the first threshold value and the heating load demand is less than the second threshold value, valves (14) and (15) are closed, valves (11) and (12) are opened, valves (13) are closed, and valves (16) and (17) are opened; the air compressor (3) is stopped, the air expander (7) is started, the compressed air generator (8) is driven to generate electricity, and the heat in the heat storage device (9) is used to heat the air before entering the air expander (7); valves (11), (12) and (13) are adjusted according to the actual heating demand to control the steam extraction amount of the steam turbine (1) of the thermal power unit.

[0073] In this embodiment, when the power generation load demand is high and the heating load demand is low, valves (14) and 15 are closed, valves (11) and valves (12) are opened, valve (13) is closed, and valves (16) and valves (17) are opened. The air compressor (3) is shut down, the air expander (7) is started, and the compressed air generator (8) is driven to generate electricity. The air expander (7) can provide 120MW of power output by doing work, and at the same time, the heat in the heat storage device (9) is used to heat the air before entering the air expander (7). At this time, the steam extraction amount of the steam turbine can be adjusted according to the actual heating demand.

[0074] In one embodiment of the present application, according to the real-time power generation load demand and the heating load demand, the operation mode of the thermal power unit energy supply device (100), the compressed air energy storage device (200) and the air expansion working device (300) of the comprehensive energy supply system is adjusted, including:

[0075] When the power generation load demand is greater than or equal to the first threshold value and the heating load demand is greater than or equal to the second threshold value, the valve (14) and the valve (15) are closed, the valve (11) is opened, the valve (12) is closed, the valve (13) is opened, and the valves (16) and (17) are opened; the air compressor (3) is stopped, the air expander (7) is started, the compressed air generator (8) is driven to generate electricity, and the heat in the heat storage device (9) is released to the heat user equipment (10), so as to reduce the steam extraction amount of the steam turbine (1) of the thermal power unit and improve the working capacity of the steam turbine (1) of the thermal power unit.

[0076] In this embodiment, when the power generation load demand is high and the heating load demand is high, valve (14) and valve (15) are closed, valve (11) is opened, valve (12) is closed, valve (13) is opened, valve (16) and valve (17) are opened. The air compressor (3) is shut down, the air expander (7) is started, and the compressed air generator (8) is driven to generate electricity. The heat in the heat storage device (9) is released to the heat user equipment (10), and a maximum of 10300GJ of heat release can be provided to improve the heating capacity. The release of heat through the heat storage device (9) can reduce the steam extraction of the steam turbine and improve the working capacity of the steam turbine unit.

[0077] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0078] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A comprehensive energy supply system based on compressed air energy storage and thermal power supply, characterized in that: include: A thermal power generation unit energy supply device (100), a compressed air energy storage device (200), an air expansion working device (300), and a heat storage device (9); the thermal power generation unit energy supply device (100), the compressed air energy storage device (200), and the air expansion working device (300) are connected in sequence, the electric energy generated by the thermal power generation unit energy supply device (100) drives the compressed air energy storage device (200), and the heat storage device (9) is connected and disconnected with the thermal power generation unit energy supply device (100), the compressed air energy storage device (200), and the air expansion working device (300) respectively; When the integrated energy supply system needs to be peak-shifted, the compressed air energy storage device (200) is activated to store energy, thereby reducing the amount of electricity connected to the grid by the integrated energy supply system; when the integrated energy supply system needs to be peak-shifted, the air expansion work device (300) is activated to generate electricity, thereby increasing the amount of electricity connected to the grid by the integrated energy supply system.

2. The system according to claim 1, characterized in that The thermal power unit energy supply device (100) comprises: a thermal power unit steam turbine (1) and a thermal power unit generator (2); The compressed air energy storage device (200) comprises: an air compressor (3), a first heat exchanger (4), an air storage device (5), and a valve (14) and a valve (15) arranged between the first heat exchanger (4) and the heat storage device (9); The air expansion working device (300) comprises: a second heat exchanger (6), an air expander (7), a compressed air generator (8), and a valve (16) and a valve (17) arranged between the second heat exchanger (6) and the heat storage device (9); The steam turbine (1) of the thermal power unit, the generator (2) of the thermal power unit, the air compressor (3), the first heat exchanger (4), the air storage device (5), the second heat exchanger (6), the air expander (7) and the compressed air generator (8) are connected in sequence; When the integrated energy supply system needs to be peak-loaded, the electric energy generated by the generator (2) of the thermal power unit drives the air compressor (3), and the high-pressure air discharged from the air compressor (3) passes through the first heat exchanger (4), and the heat generated during the compression process is released to the heat storage device (9), and the air after heat release enters the air storage device (5); when the integrated energy supply system needs to be peak-loaded, the high-pressure air first passes through the heat exchanger 6 to absorb heat, and then enters the air expander (7) to perform work, thereby driving the compressed air generator (8) to generate electricity; The integrated energy supply system further comprises: a valve (11) arranged between the steam turbine (1) of the thermal power unit and the heat user equipment (10), a valve (12) arranged between the heat storage device (9) and the steam turbine (1) of the thermal power unit, and a valve (13) arranged between the heat storage device (9) and the heat user equipment (10).

3. The system according to claim 2, characterized in that The heat storage device (9) stores the heat of steam extracted from the steam turbine (1) of the thermal power unit, and / or the heat storage device (9) stores the heat generated by the air compressor (3) during the air compression process.

4. The system according to claim 2, characterized in that The heat stored in the heat storage device (9) is released to the heat user equipment (10), and / or released to the high-pressure air before entering the air expander (7).

5. The system according to claim 2, characterized in that The first heat exchanger (4) and the second heat exchanger (6) are air-water heat exchangers; The gas storage device (5) may store gas in any one of salt caverns, pressure tanks, and artificial chambers; The heat storage device (9) is a pressure-bearing device, and the medium in the heat storage device (9) is water.

6. A method for controlling energy supply, characterized in that: Applied to a comprehensive energy supply system based on compressed air energy storage and thermal power supply, the method comprises: According to the real-time power generation load demand and heating load demand, the operation mode of the thermal power unit power supply device (100), the compressed air energy storage device (200) and the air expansion working device (300) of the comprehensive energy supply system is adjusted, wherein the operation mode includes: when the comprehensive energy supply system needs to be peak-shifted, the compressed air energy storage device (200) is enabled to store energy to reduce the online power of the comprehensive energy supply system; when the comprehensive energy supply system needs to be peak-shifted, the air expansion working device (300) is enabled to generate power to increase the online power of the comprehensive energy supply system.

7. The method according to claim 6, characterized in that The method of adjusting the operation mode of the thermal power unit energy supply device (100), the compressed air energy storage device (200) and the air expansion work device (300) of the comprehensive energy supply system according to the real-time power generation load demand and the heat supply load demand comprises: When the power generation load demand is less than a first threshold value and the heating load demand is less than a second threshold value, the air compressor (3) is started, valves (14) and (15) are opened, valves (11) and (12) are opened, and valves (13), (16) and (17) are closed; By compressing and pressurizing air to an air storage device (5), the online power of a thermal power generator (2) is reduced, and steam is extracted from a steam turbine (1) of the thermal power unit. The heat extracted from the steam turbine (1) of the thermal power unit and the heat generated during the compression process are stored in the heat storage device (9).

8. The method according to claim 6, characterized in that The method of adjusting the operation mode of the thermal power unit energy supply device (100), the compressed air energy storage device (200) and the air expansion work device (300) of the comprehensive energy supply system according to the real-time power generation load demand and the heat supply load demand comprises: When the power generation load demand is less than a first threshold value and the heating load demand is greater than or equal to a second threshold value, start the air compressor (3), open valve (14), valve (15) and valve (11), close valve (12), open valve (13), and close valve (16) and valve (17); By compressing and pressurizing air to a gas storage device (5), the grid-connected power of a thermal power generator (2) is reduced, and at the same time, the heat stored in the heat storage device (9) is released to a heat user device (10).

9. The method according to claim 6, characterized in that The method of adjusting the operation mode of the thermal power unit energy supply device (100), the compressed air energy storage device (200) and the air expansion work device (300) of the comprehensive energy supply system according to the real-time power generation load demand and the heat supply load demand comprises: When the power generation load demand is greater than or equal to the first threshold value and the heating load demand is less than the second threshold value, valve (14) and valve (15) are closed, valve (11) and valve (12) are opened, valve (13) is closed, and valve (16) and valve (17) are opened; The air compressor (3) is stopped, the air expander (7) is started, and the compressed air generator (8) is driven to generate electricity, and at the same time, the heat in the heat storage device (9) is used to heat the air before entering the air expander (7); The valves (11), (12) and (13) are adjusted according to the actual heating demand to control the steam extraction amount of the steam turbine (1) of the thermal power unit.

10. The method according to claim 6, characterized in that The method of adjusting the operation mode of the thermal power unit energy supply device (100), the compressed air energy storage device (200) and the air expansion work device (300) of the comprehensive energy supply system according to the real-time power generation load demand and the heat supply load demand comprises: When the power generation load demand is greater than or equal to a first threshold value and the heating load demand is greater than or equal to a second threshold value, close valve (14) and valve (15), open valve (11), close valve (12), open valve (13), and open valve (16) and valve (17); The air compressor (3) is shut down, the air expander (7) is started, the compressed air generator (8) is driven to generate electricity, and the heat in the heat storage device (9) is released to the heat user equipment (10), so as to reduce the steam extraction amount of the steam turbine (1) of the thermal power unit and improve the working capacity of the steam turbine (1) of the thermal power unit.

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