Device system for energy storage, power generation and peak regulation of low-calorific-value combustible gas

Abstract

The utility model provides a device system for energy storage, power generation and peak regulation of low-heating-value combustible gas. The device system comprises a device system adopting an overheating device to heat steam or a device system adopting a gas-fired boiler to heat steam. In the energy storage stage, only heat needed for generating saturated steam is stored, in the energy release stage, the energy storage medium is reheated to generate superheated steam, or a gas boiler is adopted for heating to generate the superheated steam, the storage temperature of the high-temperature heat exchange medium is reduced, and the equipment investment is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to a device system for low calorific value combustible gas energy storage power generation peak regulation. Background Art

[0002] In current industrial production, due to the particularity of some process flows, a large amount of low calorific value combustible gas is generated during production. For the purpose of energy conservation and environmental protection, factories can build their own power generation systems to digest this part of combustible gas. Self-built power generation systems are already quite popular, and some large factories can generate more than half of their own electricity.

[0003] CN107141189A discloses a methanation reaction system, including a peak-shaving system of a power plant and a power plant of the methanation reaction system. The methanation reaction system includes: an electrolytic hydrogen production device, which is connected to a power supply device of the power plant, and is used to receive the peak-shaving surplus electricity output by the power supply device of the power plant to prepare hydrogen; a carbon dioxide supply source, which is used to provide carbon dioxide; and a methanation reaction device, which is connected to the electrolytic hydrogen production device and the carbon dioxide supply source, and is used to prepare methane using hydrogen and carbon dioxide as raw materials. The methanation reaction system can directly consume the peak-shaving surplus electricity of the power plant, and indirectly utilize the abandoned wind, solar, hydro and nuclear power, alleviating the problems of grid balance and peak-valley difference. Since the peak-shaving surplus electricity is subjected to hydrogen production operation and finally made into methane gas, the disguised storage of electric energy is realized.

[0004] CN107355262A discloses a peak-shaving power generation system for a thermal power plant, comprising: a thermal power generation module, which can receive oxygen generated by a water electrolysis module and synthetic gas generated by a gas mixing module; a booster station, which boosts the power and transmits it to the power grid; a peak-shaving control platform, which is used to send an opening and closing instruction to a switch module; a switch module, which is used to connect or disconnect the thermal power generation module and the inverter; the inverter is used to invert the power and transmit it to the water electrolysis module; the water electrolysis module is used to electrolyze pure water; the pure water supply module is used to provide pure water; the gas mixing module is used for gas mixing; the biomass gas generation module is used to generate biomass gas and transmit the biomass gas to the gas mixing module. The system improves the flexibility of peak-shaving of thermal power plants and reduces the carbon emission intensity of thermal power plants.

[0005] CN113250769A discloses a combustible gas power supply device for the user side and its peak load regulation method and application, which stores heat by extracting combustible gas to heat the heat storage medium, and releases the stored heat during the peak period of electricity consumption to achieve economical use of heat. However, the calorific value of low calorific value combustible gas is low, and the heating capacity of the combustion furnace for the heat storage medium is limited, resulting in a narrow working temperature range of the heat storage medium.

[0006] The above-mentioned peak-load generation system also has the problem that the working temperature range of the heat storage medium is limited to a high temperature range, requiring more expensive storage tanks, thereby increasing equipment investment. Utility Model Content

[0007] In view of the problems existing in the prior art, the utility model provides a device system for low calorific value combustible gas energy storage power generation peak regulation. In view of the low calorific value of low calorific value combustible gas and the limited heating capacity of the combustion furnace for the heat exchange medium, the energy storage medium is reasonably designed to be reheated when releasing energy to meet the needs of the steam superheating stage, or a gas boiler is added to heat the steam, thereby reducing the storage temperature of the heat exchange medium, reducing the material requirements for equipment manufacturing, and achieving a reduction in equipment investment.

[0008] To achieve this purpose, the utility model adopts the following technical solutions:

[0009] The utility model provides a low calorific value combustible gas energy storage power generation peak regulation device system, the device system includes a device system using a superheater to heat steam or a device system using a gas boiler to heat steam;

[0010] The device system for heating steam by using a superheating device comprises a first heat exchange medium storage device, a flue gas heat exchange device and a combustion furnace which are connected in sequence; the combustion furnace is respectively connected to the superheating device and the second heat exchange medium storage device; the second heat exchange medium storage device is respectively connected to the evaporation device and the flue gas heat exchange device; the superheating device is sequentially connected to the evaporation device, the preheating device and the first heat exchange medium storage device; the superheating device is sequentially connected to the steam turbine and the generator via a steam pipeline;

[0011] The device system for heating steam using a gas boiler includes a first heat exchange medium storage device, a flue gas heat exchange device, a combustion furnace, a second heat exchange medium storage device, an evaporation device and a preheating device which are cyclically connected; the evaporation device is connected to the gas boiler, the steam turbine and the generator in sequence via a steam pipeline.

[0012] The device system for peak-shaving of low-calorific value combustible gas energy storage power generation combines the characteristics of low calorific value combustible gas with low calorific value and high temperature of heat exchange medium, which requires high investment in storage device, and provides a device system for heating steam with superheater and a device system for heating steam with gas boiler. In the energy storage stage, only the heat required for preheating and evaporation of feed water is stored. When releasing energy, the device system for heating steam with superheater divides a part of the heat exchange medium in the second heat exchange medium storage device into the flue gas heat exchange device and combustion furnace for reheating, and then enters the superheater to exchange heat with steam to meet the demand of steam superheating stage; or the device system for heating steam with gas boiler heats the steam to meet the demand of steam superheating stage. In this way, the storage temperature of the heat exchange medium can be reduced, the material requirements for equipment manufacturing can be reduced, and the equipment investment can be reduced.

[0013] The low calorific value combustible gas in this utility model refers to the calorific value not exceeding 6280kJ / Nm 3 Combustible gases, such as blast furnace gas, etc.

[0014] Preferably, the low calorific value combustible gas energy storage power generation peak regulation device system also includes a heating device, an air preheating device, a flue gas purification device and a chimney which are sequentially connected to the flue gas heat exchange device.

[0015] Preferably, the heating device is also connected to the combustion furnace via a first combustible gas pipeline.

[0016] Preferably, the air preheating device is also connected to the combustion furnace via a first air duct.

[0017] Preferably, in the device system using a gas boiler to heat steam, the heating device is also connected to the gas boiler via a second combustible gas pipeline.

[0018] Preferably, in the device system using a gas boiler to heat steam, the air preheating device is also connected to the gas boiler via a second air duct.

[0019] Preferably, a first supplementary combustion device is provided in the combustion furnace.

[0020] The first supplementary combustion device in the utility model can be a permanent lamp, which introduces a small amount of high calorific value fuel gas to prevent the furnace from flameout and explosion during operation, such as natural gas, coke oven gas, converter gas, etc.

[0021] Preferably, a second supplementary combustion device is provided in the gas boiler to introduce a small amount of high calorific value gas for combustion, such as natural gas, coke oven gas, converter gas, etc.

[0022] Preferably, the preheating device is connected to the water supply pipeline.

[0023] Preferably, the heating device is connected to the combustible gas delivery pipeline.

[0024] Preferably, the air preheating device is connected to the air delivery duct.

[0025] Preferably, a first control pump is provided on the outlet pipeline of the first heat exchange medium storage device.

[0026] Preferably, a second control pump is provided on the outlet pipe of the second heat exchange medium storage device.

[0027] Preferably, a first valve is provided on the connecting pipe between the combustion furnace and the second heat exchange medium storage device.

[0028] Preferably, a second valve is provided on the connecting pipe between the combustion furnace and the superheating device.

[0029] Preferably, a third valve is provided on the connecting pipe between the second heat exchange medium storage device and the flue gas heat exchange device.

[0030] Preferably, a fourth valve is provided on the connecting pipe between the second heat exchange medium storage device and the evaporation device.

[0031] Preferably, a fifth valve is provided on the connecting pipe between the first heat exchange medium storage device and the flue gas heat exchange device.

[0032] The operation method of the low calorific value combustible gas energy storage power generation peak regulation device system of the utility model includes:

[0033] Energy storage stage: the heat exchange medium in the first heat exchange medium storage device is pumped out by the first control pump, and is heated by the flue gas heat exchange device and the combustion furnace in turn, and then enters the second heat exchange medium storage device for storage;

[0034] In the energy release stage, when the device system that uses the superheating device to heat steam generates steam for power generation: the heat exchange medium in the second heat exchange medium storage device is pumped out by the second control pump and divided into two paths. After passing through the third valve, it enters the flue gas heat exchange device and the combustion furnace in turn for heating, and then enters the superheating device through the second valve; the other path enters the evaporation device and the preheating device in turn through the fourth valve to release heat and then returns to the first heat exchange medium storage device; the feed water is transported by the feed water delivery pipeline, enters the preheating device, the evaporation device and the superheating device in turn, and then becomes superheated steam and enters the steam turbine to do work, driving the generator to generate electricity;

[0035] In the energy release stage, when the device system using a gas boiler to heat steam generates steam for power generation: the heat exchange medium in the second heat exchange medium storage device is pumped out by the second control pump and then enters the evaporation device and the preheating device in turn to release heat and then returns to the first heat exchange medium storage device; the feed water is transported by the feed water delivery pipeline, and then enters the preheating device and the evaporation device in turn to become saturated steam and then enters the gas boiler. The gas boiler superheats the saturated steam, and the superheated steam obtained enters the steam turbine to do work, driving the generator to generate electricity;

[0036] The flue gas generated in the flue gas heat exchange device enters the heating device, air preheating device and flue gas purification device in sequence, and is finally discharged through the chimney;

[0037] The combustible gas entering the combustion furnace exchanges heat with the flue gas through the heating device; the air entering the combustion furnace exchanges heat with the flue gas through the air preheating device;

[0038] The combustible gas entering the gas boiler exchanges heat with the flue gas through the heating device; the air entering the gas boiler exchanges heat with the flue gas through the air preheating device.

[0039] Compared with the prior art, the utility model has at least the following beneficial effects:

[0040] (1) In the low calorific value combustible gas energy storage and power generation peak regulation device system provided by the utility model, the storage temperature of the heat storage medium only needs to meet the requirement of generating saturated steam, thereby lowering the storage temperature of the high-temperature medium and the material requirements of the storage container, which can greatly reduce equipment investment; in the energy release stage, it also has the ability to absorb low calorific value combustible gas, which can meet the needs of continuous production in the factory.

[0041] (2) The utility model provides a low calorific value combustible gas energy storage power generation peak regulation device system that solves the problem of absorbing intermittent combustible gas. It utilizes the discontinuous combustible gas in the production process and emits it when the electricity price is at its peak, thereby obtaining higher economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the device system for low calorific value combustible gas energy storage power generation peak regulation in Example 1 of the utility model.

[0043] Figure 2 It is a schematic diagram of the device system for low calorific value combustible gas energy storage power generation peak regulation in Example 2 of the utility model.

[0044] In the figure: 1- flue gas heat exchange device; 2- combustion furnace; 3- second heat exchange medium storage device; 4- first heat exchange medium storage device; 5- superheating device; 6- evaporation device; 7- preheating device; 8- heating device; 9- air preheating device; 10- flue gas purification device; 11- chimney; 12- first valve; 13- second valve; 14- third valve; 15- fourth valve; 16- second control pump; 17- first control pump; 18- fifth valve; 19- gas boiler;

[0045] 1-1 heat storage medium outlet; 1-2 heat storage medium inlet; 1-3 flue gas inlet; 1-4 flue gas outlet;

[0046] 2-1 heat storage medium inlet; 2-2 flue gas outlet; 2-3 heat storage medium outlet. DETAILED DESCRIPTION

[0047] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0048] The utility model is further described in detail below. However, the following examples are only simple examples of the utility model and do not represent or limit the scope of protection of the utility model. The scope of protection of the utility model shall be subject to the claims.

[0049] It should be understood that, in the description of the present utility model, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0050] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0051] Those skilled in the art should understand that the utility model must include necessary pipelines, conventional valves and general pump equipment for realizing a complete process, but the above content does not belong to the main utility model points of the utility model. Those skilled in the art can add layouts on their own based on the process flow and equipment structure selection, and the utility model does not make special requirements and specific limitations on this.

[0052] Example 1

[0053] This embodiment provides a low calorific value combustible gas energy storage power generation peak regulation device system, the low calorific value combustible gas energy storage power generation peak regulation device system includes a device system using a superheating device to heat steam; its schematic diagram is as follows Figure 1 shown.

[0054] The device system for heating steam using a superheating device includes a first heat exchange medium storage device 4, a flue gas heat exchange device 1 and a combustion furnace 2 connected in sequence; the combustion furnace 2 is respectively connected to the superheating device 5 and the second heat exchange medium storage device 3; the second heat exchange medium storage device 3 is respectively connected to the evaporation device 6 and the flue gas heat exchange device 1; the superheating device 5 is connected to the evaporation device 6, the preheating device 7 and the first heat exchange medium storage device 4 in sequence; the superheating device 5 is connected to the steam turbine and the generator in sequence via a steam pipe.

[0055] The low calorific value combustible gas energy storage power generation peak regulation device system also includes a heating device 8, an air preheating device 9, a flue gas purification device 10 and a chimney 11 which are sequentially connected to the flue gas heat exchange device 1.

[0056] The heating device 8 is also connected to the combustion furnace 2 via a combustible gas pipeline;

[0057] The air preheating device 9 is also connected to the combustion furnace 2 via an air duct.

[0058] A first supplementary combustion device is arranged in the combustion furnace 2.

[0059] The preheating device 7 is connected to the water supply pipeline;

[0060] The heating device 8 is connected to the combustible gas transmission pipeline;

[0061] The air preheating device 9 is connected to the air delivery pipeline.

[0062] A first control pump 17 is provided on the outlet pipe of the first heat exchange medium storage device 4;

[0063] A second control pump 16 is provided on the outlet pipe of the second heat exchange medium storage device 3 .

[0064] A first valve 12 is provided on the connecting pipe between the combustion furnace 2 and the second heat exchange medium storage device 3;

[0065] A second valve 13 is provided on the connecting pipe between the combustion furnace 2 and the superheating device 5;

[0066] A third valve 14 is provided on the connecting pipe between the second heat exchange medium storage device 3 and the flue gas heat exchange device 1;

[0067] A fourth valve 15 is provided on the connecting pipe between the second heat exchange medium storage device 3 and the evaporation device 6;

[0068] A fifth valve 18 is provided on the connecting pipe between the first heat exchange medium storage device 4 and the flue gas heat exchange device 1 .

[0069] Figure 1 The flue gas heat exchange device 1 is provided with a heat storage medium outlet 1-1, a heat storage medium inlet 1-2, a flue gas inlet 1-3 and a flue gas outlet 1-4.

[0070] The combustion furnace 2 is provided with a heat storage medium inlet 2-1, a flue gas outlet 2-2, and a heat storage medium outlet 2-3.

[0071] This embodiment also provides an operating method for the above-mentioned low calorific value combustible gas energy storage power generation peak regulation device system, the heat exchange medium used in the system is 40% KNO 3 +60%NaNO 3The mixed binary molten salt has an operating temperature of 280°C to 565°C, the storage temperature of the first heat exchange medium storage device 4 is 280°C to 300°C, and the storage tank temperature of the second heat exchange medium storage device 3 is 400°C to 420°C.

[0072] The operation methods include:

[0073] Energy storage stage: the heat exchange medium in the first heat exchange medium storage device 4 is pumped out by the first control pump 17, and is heated by the flue gas heat exchange device 1 and the combustion furnace 2 in turn before entering the second heat exchange medium storage device 3 for storage; at this time, the second valve 13 and the third valve 14 are in a closed state.

[0074] Energy release stage: the heat exchange medium in the second heat exchange medium storage device 3 is pumped out by the second control pump 16, divided into two paths, and enters the flue gas heat exchange device 1 and the combustion furnace 2 in turn after passing through the third valve 14. After the heating temperature rises to 550-565°C, it enters the superheating device 5 through the second valve 13 to release heat to superheat the steam, and the temperature drops to 400-420°C, and merges with the molten salt through the fourth valve 15 on the other side, and enters the evaporation device 6 and the preheating device 7 in turn to release heat and then returns to the first heat exchange medium storage device 4. At this time, the first valve 12 and the fifth valve 18 are in a closed state; the feed water is transported by the feed water delivery pipeline, and enters the preheating device 7, the evaporation device 6 and the superheating device 5 in turn to become superheated steam and enter the steam turbine to do work, driving the generator to generate electricity. Here, a device system for heating steam with a superheating device is used to generate steam for power generation.

[0075] The flue gas generated in the flue gas heat exchange device 1 enters the heating device 8, the air preheating device 9 and the flue gas purification device 10 in sequence, and is finally discharged through the chimney 11;

[0076] The combustible gas entering the combustion furnace 2 exchanges heat with the flue gas through the heating device 8; the air entering the combustion furnace 2 exchanges heat with the flue gas through the air preheating device 9.

[0077] Example 2

[0078] This embodiment provides a low calorific value combustible gas energy storage power generation peak regulation device system, the low calorific value combustible gas energy storage power generation peak regulation device system includes a gas boiler to heat steam device system; its schematic diagram is as follows Figure 2 shown.

[0079] The device system for heating steam using a gas boiler includes a first heat exchange medium storage device 4, a flue gas heat exchange device 1, a combustion furnace 2, a second heat exchange medium storage device 3, an evaporation device 6 and a preheating device 7 which are cyclically connected; the evaporation device 6 is connected to the gas boiler 19, the steam turbine and the generator in sequence via a steam pipeline.

[0080] The low calorific value combustible gas energy storage power generation peak regulation device system also includes a heating device 8, an air preheating device 9, a flue gas purification device 10 and a chimney 11 which are sequentially connected to the flue gas heat exchange device 1.

[0081] The heating device 8 is also connected to the combustion furnace 2 via a first combustible gas pipeline;

[0082] The air preheating device 9 is also connected to the combustion furnace 2 via a first air duct.

[0083] In the device system using a gas boiler to heat steam, the heating device 8 is also connected to the gas boiler 19 via a second combustible gas pipeline;

[0084] In the device system using a gas boiler to heat steam, the air preheating device 9 is also connected to the gas boiler 19 via a second air pipeline.

[0085] A first supplementary combustion device is arranged in the combustion furnace 2.

[0086] A second supplementary combustion device is provided in the gas boiler 19 .

[0087] The preheating device 7 is connected to the water supply pipeline;

[0088] The heating device 8 is connected to the combustible gas transmission pipeline;

[0089] The air preheating device 9 is connected to the air delivery pipeline.

[0090] A first control pump 17 is provided on the outlet pipe of the first heat exchange medium storage device 4;

[0091] A second control pump 16 is provided on the outlet pipe of the second heat exchange medium storage device 3 .

[0092] A first valve 12 is provided on the connecting pipe between the combustion furnace 2 and the second heat exchange medium storage device 3;

[0093] A fourth valve 15 is provided on the connecting pipe between the second heat exchange medium storage device 3 and the evaporation device 6;

[0094] A fifth valve 18 is provided on the connecting pipe between the first heat exchange medium storage device 4 and the flue gas heat exchange device 1 .

[0095] Figure 2 The flue gas heat exchange device 1 is provided with a heat storage medium outlet 1-1, a heat storage medium inlet 1-2, a flue gas inlet 1-3 and a flue gas outlet 1-4.

[0096] The combustion furnace 2 is provided with a heat storage medium inlet 2-1, a flue gas outlet 2-2, and a heat storage medium outlet 2-3.

[0097] This embodiment also provides an operation method of the above-mentioned low calorific value combustible gas energy storage power generation peak regulation device system, the heat exchange medium used in the system is thermal oil, and the working temperature is 160-350°C. The storage temperature of the first heat exchange medium storage device 4 is 160-180°C, and the storage tank temperature of the second heat exchange medium storage device 3 is 330-335°C.

[0098] The operation methods include:

[0099] Energy storage stage: the heat exchange medium in the first heat exchange medium storage device 4 is pumped out by the first control pump 17, and is heated by the flue gas heat exchange device 1 and the combustion furnace 2 in turn before entering the second heat exchange medium storage device 3 for storage; at this time, the fourth valve 15 is in a closed state;

[0100] Energy release stage: the heat exchange medium in the second heat exchange medium storage device 3 is pumped out by the second control pump 16, and then enters the evaporation device 6 and the preheating device 7 in sequence through the fourth valve 15 to release heat, and then returns to the first heat exchange medium storage device 4; the feed water is transported by the feed water delivery pipeline, and enters the preheating device 7 and the evaporation device 6 in sequence to become saturated steam, and then enters the gas boiler 19, the gas boiler 19 superheats the saturated steam, and the superheated steam obtained enters the steam turbine to do work, driving the generator to generate electricity. Here, a gas boiler is used to heat the steam to generate steam for power generation.

[0101] The flue gas generated in the flue gas heat exchange device 1 enters the heating device 8, the air preheating device 9 and the flue gas purification device 10 in sequence, and is finally discharged through the chimney;

[0102] The combustible gas entering the combustion furnace 2 exchanges heat with the flue gas through the heating device 8; the air entering the combustion furnace 2 exchanges heat with the flue gas through the air preheating device 9;

[0103] The combustible gas entering the gas boiler 19 exchanges heat with the flue gas through the heating device 8 ; the air entering the gas boiler 19 exchanges heat with the flue gas through the air preheating device 9 .

[0104] In summary, the low calorific value combustible gas energy storage power generation peak regulation device system provided by the utility model is reasonably designed, which reduces the storage temperature of high-temperature media, reduces the material requirements for storage containers, and greatly reduces equipment investment; it also solves the problem of dissipating intermittent combustible gas, utilizes discontinuous combustible gas in the production process, and emits it when electricity prices are peak, with high economic benefits.

[0105] The applicant declares that the utility model illustrates the detailed structural features of the utility model through the above-mentioned embodiments, but the utility model is not limited to the above-mentioned detailed structural features, that is, it does not mean that the utility model must rely on the above-mentioned detailed structural features to be implemented. Those skilled in the art should understand that any improvement to the utility model, equivalent replacement of the components selected by the utility model, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the utility model.

[0106] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

Claims

1. A low calorific value combustible gas energy storage power generation peak regulation device system, characterized in that: The device system includes a device system that uses a superheater to heat steam or a device system that uses a gas boiler to heat steam; The device system for heating steam using a superheating device comprises a first heat exchange medium storage device, a flue gas heat exchange device and a combustion furnace connected in sequence; the combustion furnace is respectively connected to the superheating device and the second heat exchange medium storage device; the second heat exchange medium storage device is respectively connected to the evaporation device and the flue gas heat exchange device; the superheating device is sequentially connected to the evaporation device, the preheating device and the first heat exchange medium storage device; the superheating device is sequentially connected to the steam turbine and the generator via a steam pipeline; The device system for heating steam using a gas boiler includes a first heat exchange medium storage device, a flue gas heat exchange device, a combustion furnace, a second heat exchange medium storage device, an evaporation device and a preheating device which are cyclically connected; the evaporation device is connected to the gas boiler, the steam turbine and the generator in sequence via a steam pipeline.

2. The device system according to claim 1, characterized in that: The low calorific value combustible gas energy storage power generation peak regulation device system also includes a heating device, an air preheating device, a flue gas purification device and a chimney which are sequentially connected to the flue gas heat exchange device.

3. The device system according to claim 2, characterized in that: The heating device is also connected to the combustion furnace via a first combustible gas pipeline; The air preheating device is also connected to the combustion furnace via a first air duct.

4. The device system according to claim 2, characterized in that: In the device system using a gas boiler to heat steam, the heating device is also connected to the gas boiler via a second combustible gas pipeline; In the device system using a gas boiler to heat steam, the air preheating device is also connected to the gas boiler via a second air pipeline.

5. The device system according to claim 1, characterized in that: A first supplementary combustion device is arranged in the combustion furnace.

6. The device system according to claim 1, characterized in that: A second supplementary combustion device is arranged in the gas boiler.

7. The device system according to claim 2, characterized in that: The preheating device is connected to the water supply pipeline; The heating device is connected to the combustible gas transmission pipeline; The air preheating device is connected to the air delivery pipeline.

8. The device system according to claim 1, characterized in that: The outlet pipeline of the first heat exchange medium storage device is provided with a first control pump.

9. The device system according to claim 1, characterized in that: A second control pump is provided on the outlet pipeline of the second heat exchange medium storage device.

10. The device system according to claim 1, characterized in that: A first valve is provided on the connecting pipe between the combustion furnace and the second heat exchange medium storage device; A second valve is provided on the connecting pipe between the combustion furnace and the superheating device; A third valve is provided on the connecting pipe between the second heat exchange medium storage device and the flue gas heat exchange device; A fourth valve is provided on the connecting pipe between the second heat exchange medium storage device and the evaporation device; A fifth valve is provided on the connecting pipe between the first heat exchange medium storage device and the flue gas heat exchange device.

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