Energy-saving multi-furnace low-heating-value fuel gas combustion heat storage power generation device system

Abstract

The utility model provides an energy-saving multi-furnace low-heating-value combustion gas heat storage power generation device system. The energy-saving multi-furnace low-heating-value combustion gas heat storage power generation device system comprises a first heat exchange medium storage device, a smoke heat exchange device, a second heat exchange medium storage device, combustion furnaces and a third heat exchange medium storage device which are sequentially connected. The third heat exchange medium storage device is sequentially connected with the overheating device, the evaporation device, the preheating device and the first heat exchange medium storage device; the overheating device is sequentially connected with the steam turbine and the generator; the preheating device is further connected with the evaporation device and the overheating device in sequence through a water supply pipeline; the flue gas heat exchange device comprises at least two flue gas heat exchangers which are arranged in parallel; the combustion furnace comprises at least two combustion furnace bodies which are arranged in series. According to the heat storage power generation device system, the operation flow of a heat storage medium is reduced, and the construction cost and the operation difficulty of a heat storage system are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a heat storage power generation device system for energy-saving multi-furnace combustion of low-calorific-value gas. Background Art

[0002] A large amount of coal gas is generated in the production process of steel. At present, most steel plants have built their own power generation systems and generate electricity by burning blast furnace gas to supplement the plant's electricity consumption. By configuring a heat storage facility for the coal gas power generation system, the self-built power plant can generate less electricity during the low electricity price period, purchase more low-price electricity from the power grid, generate more electricity during the high electricity consumption period, use less high-price electricity from the power grid, and reduce the electricity consumption cost of the power plant. However, the calorific value of the gas generally used in self-built power plants (such as the coal gas of the above-mentioned steel plants) is relatively low, and the temperature rise of the heat storage medium in a single combustion furnace is small. In order to heat the heat storage medium to the target temperature, the temperature of the heat storage medium is generally slowly increased by circulating the heat storage medium between the storage tank and the combustion furnace multiple times. The consequence of this is that the flow rate of the heat storage medium in a single cycle needs to be increased exponentially, and the design requirements for the supporting pipelines, pumps, valves, and instruments all need to be improved. Especially in the high-temperature heat storage medium loop, the corresponding accessory costs are relatively high, and increasing the design requirements will greatly increase the construction cost of the system.

[0003] CN113294829A discloses a gas turbine waste heat energy storage heating system, including a gas turbine power generation system, an exhaust gas recovery energy storage system, and a heating system. Part of the high-temperature flue gas generated by the combustion of natural gas enters the gas turbine to do work, and the energy generated is converted into electric energy by the generator and stored in the storage battery, realizing the conversion of the waste heat of the high-temperature flue gas into electric energy; another part of the high-temperature flue gas enters the heat exchanger, and the tap water entering the heat exchanger absorbs heat and evaporates into high-temperature water vapor. The high-temperature water vapor enters the storage tank, realizing the direct storage of waste heat in the water vapor; during winter heating, the high-temperature water vapor enters the mixing chamber through the water vapor outlet of the storage tank, and the tap water liquefies and cools the high-temperature water vapor entering the mixing chamber to the temperature required for heating supply. After being transported to the user end by the heating supply mechanism, the warm water after heat extraction by the user end is treated by the sewage processor and then pumped into the return water inlet of the mixing chamber and the heat exchanger by the water pump to be recycled as the water source, improving the overall utilization efficiency of energy.

[0004] CN113250769A discloses a combustible gas power supply device for the user side, its peak shaving method and application. The combustible gas power supply device for the user side includes a combustible gas power supply system for the user side. The combustible gas power supply system includes a deaerator, a condenser, a steam turbine and a boiler. The steam turbine is connected with a generator. It also includes a power supply peak shaving device externally connected to the combustible gas power supply system. The power supply peak shaving device includes: a combustion furnace having an inlet for introducing combustible gas; a first heat storage system communicating with the combustion furnace to form a heat exchange loop; a first heat exchange system communicating with the first heat storage system to form a heat exchange loop, its water inlet communicating with the water outlet of the deaerator, and its gas outlet communicating with the air inlet of the steam turbine.

[0005] CN114811559A discloses a high and low temperature heat storage peak shaving system for a thermal power plant. The system includes a boiler system, a steam turbine power generation system, a high temperature heat storage device, and a low temperature heat storage device; the high temperature heat storage device uses high temperature steam at the steam outlet of the boiler system for heat storage, and the condensed water after cooling is mixed with the feed water at the boiler inlet. When the high temperature heat storage device releases heat, a part of the feed water at the boiler inlet enters the high temperature heat storage device to generate high temperature steam; the low temperature heat storage device uses the feed water at the boiler inlet for heat storage, and the feed water after reducing the temperature is mixed with the feed water at the inlet of the regenerative heater of the steam turbine power generation system. When the low temperature heat storage device releases heat, a part of the feed water at the inlet of the regenerative heater enters the low temperature heat storage device, and the heated feed water is mixed with the feed water at the outlet of the regenerative heater; the high and low temperature mixed heat storage improves the variable load rate and range of power generation in the thermal power plant, increases the flexibility of power generation and heat supply in the thermal power plant, and efficiently outputs electricity and heat according to different load requirements.

[0006] However, the above-mentioned devices still have problems such as high temperature of the heat storage medium, large flow rate, high equipment cost, and great difficulty in system operation. Summary of the Utility Model

[0007] In view of the problems existing in the prior art, the present utility model provides an energy-saving multi-furnace combustion low calorific value gas heat storage power generation device system, which changes the original working process of heating the heat storage medium in multiple cycles to one-time heating by means of multi-furnace combustion and step-by-step temperature increase, reduces the working flow rate of the heat storage medium, reduces the design requirements of the device system, and further reduces the equipment cost and operation difficulty.

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

[0009] The utility model provides a heat storage power generation device system for energy-saving multi-furnace combustion of low-calorific-value gas. The heat storage power generation device system comprises a first heat exchange medium storage device, a flue gas heat exchange device, a second heat exchange medium storage device, a combustion furnace and a third heat exchange medium storage device which are connected in sequence; the third heat exchange medium storage device is connected to a superheating device, an evaporation device, a preheating device and the first heat exchange medium storage device in sequence; the superheating device is connected to a steam turbine and a generator in sequence; the preheating device is further connected to the evaporation device and the superheating device in sequence through a feed water pipeline;

[0010] The flue gas heat exchange device comprises at least two flue gas heat exchangers arranged in parallel; the combustion furnace comprises at least two combustion furnaces arranged in series.

[0011] In the heat storage power generation device system for energy-saving multi-furnace combustion of low-calorific-value gas of the utility model, the flue gas heat exchange device utilizes the waste heat of the flue gas to increase the temperature of the heat storage medium, which can reduce the designed load of the combustion furnace. The flue gas heat exchange devices are arranged in parallel because for the multi-stage temperature rise of the heat storage medium by multiple series-connected combustion furnaces, the flue gas temperatures of each combustion furnace are inconsistent. Arranging multiple flue gas heat exchange devices in parallel can carry out differential design on the flue gas heat exchangers configured for different combustion furnaces to ensure that the exhaust gas temperature after flue gas heat exchange is consistent. The second heat exchange medium storage device serves as the storage device for the heat storage medium after passing through each parallel flue gas heat exchange device. Tank mixing is used instead of pipeline mixing. Tank mixing can ensure the temperature consistency of the heat exchange medium entering the combustion furnace, and then merge into one path and enter the series-connected combustion furnace, which can also ensure the temperature of the heat exchange medium exiting the combustion furnace. The second heat exchange medium storage device can be used as the evacuation device for the heat storage medium in the system when the heat storage power generation device system for energy-saving multi-furnace combustion of low-calorific-value gas stops.

[0012] In the heat storage power generation device system for energy-saving multi-furnace combustion of low-calorific-value gas of the utility model, the structural design of the flue gas heat exchange device is reasonable. By the way of multi-furnace combustion and multi-stage temperature rise, the original working process of heating the heat storage medium through multiple cycles is changed to one-time heating, which reduces the working flow rate of the heat storage medium, and further reduces the system cost and operation difficulty. By gradually increasing the temperature of the heat storage medium through the flue gas heat exchange device and the combustion furnace, only high-temperature-resistant materials can be used for manufacturing the combustion furnace in the high-temperature section, and low-temperature-resistant materials can be used for the combustion furnace in the low-temperature section, reducing the equipment cost. Since there is only an over-temperature risk for the heat storage medium in the last combustion furnace in the heat storage power generation device system of the utility model, only the last combustion furnace can be more finely controlled, such as controlling the burner opening, damper opening, etc., greatly reducing the system control difficulty.

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

[0014] Preferably, the heat storage power generation device system further includes an air preheating device, a gas heating device, and a chimney that are sequentially connected to the flue gas heat exchange device.

[0015] Preferably, the air preheating device includes at least two air preheaters arranged in parallel, and different designs can be carried out for each air preheater to control the temperature, air volume, and pressure of the air introduced into each combustion furnace.

[0016] Preferably, the number of the air preheaters is the same as the number of the flue gas heat exchangers.

[0017] Preferably, the first heat exchange medium storage device is connected to the flue gas heat exchange device via a first delivery pump;

[0018] Preferably, the second heat exchange medium storage device is connected to the combustion furnace via a second delivery pump;

[0019] Preferably, the third heat exchange medium storage device is connected to the superheating device via a third delivery pump.

[0020] Preferably, the steam turbine is respectively connected to a condensing device, a heat pump, and a deaerating device.

[0021] The working principle of the heat pump in the present utility model is that the high-temperature steam extracted from the steam turbine enters the heat pump to do work, absorbs the waste heat in the circulating water, heats the condensate entering the heat pump, and finally the heat in the high-temperature steam and the circulating water is transferred to the condensate through the heat pump, increasing the temperature of the condensate entering the preheater.

[0022] Preferably, the condensing device is connected to the heat pump in a cycle.

[0023] Preferably, the condensing device is connected to a cooling tower and a circulating pump in a cycle.

[0024] Preferably, the heat pump is sequentially connected to a water pump, a deaerating device, a feed water pump, and a preheating device.

[0025] The operation method of the energy-saving multi-furnace combustion low-calorific-value gas heat storage power generation device system in the present utility model includes:

[0026] Energy storage stage: The heat exchange medium in the first heat exchange medium storage device enters the flue gas heat exchange device through the first delivery pump, is heated, and then enters the second heat exchange medium storage device; the heat exchange medium in the second heat exchange medium storage device enters the combustion furnace through the second delivery pump, is heated again, and then enters the third heat exchange medium storage device for storage;

[0027] The air enters the combustion furnace after being heated by the air preheating device, the flue gas enters the combustion furnace after being heated by the gas heating device, and the flue gas generated by the combustion furnace sequentially releases heat through the flue gas heat exchange device, the air preheating device, and the gas heating device, and then is discharged through the chimney;

[0028] Energy release stage: After the heat exchange medium in the third heat exchange medium storage device enters the superheating device, the evaporation device, and the preheating device in sequence through the third delivery pump to release heat, it enters the first heat exchange medium storage device for storage;

[0029] The feed water is boosted and transported by the feed water pump, enters the preheating device, the evaporation device, and the superheating device in sequence to absorb heat, and then enters the steam turbine to do work to drive the generator to generate electricity;

[0030] The exhaust steam generated by the steam turbine enters the condensing device to be condensed into condensed water, and then is divided into two paths. One path enters the heat pump to release heat, and the other path enters the cooling tower to release heat and then passes through the circulating pump, and is merged with the water coming out of the heat pump and then returns to the condensing device;

[0031] Steam is extracted from the steam turbine. One path of the extracted steam enters the heat pump as a high-temperature heat source, and the other path of the extracted steam enters the deaerator as a heating and deaeration heat source; among them, the extracted steam in the heat pump drives the heat pump to do work, exchanges heat with the condensed water coming out of the condensing device, and then enters the deaerator through the water pump; the extracted steam in the deaerator heats and deaerates the condensed water and is introduced into the preheating device by the feed water pump.

[0032] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0033] (1) The heat storage power generation device system for energy-saving multi-furnace combustion of low-calorific-value gas provided by the present utility model changes the original working process of heating the heat storage medium in multiple cycles to one-time heating by means of multi-furnace combustion and step-by-step temperature increase, reduces the working flow of the heat storage medium, reduces the design requirements of the system, and reduces the system cost and operation difficulty.

[0034] (2) The heat storage power generation device system for energy-saving multi-furnace combustion of low-calorific-value gas provided by the present utility model can heat the heat storage medium by means of step-by-step temperature increase. Only high-temperature-resistant materials can be used to manufacture the combustion furnace in the high-temperature section, and low-temperature-resistant materials can be used for the combustion furnace in the low-temperature section, reducing the equipment cost.

[0035] (3) Since there is only an over-temperature risk for the heat storage medium in the last combustion furnace in the heat storage power generation device system for energy-saving multi-furnace combustion of low-calorific-value gas provided by the present utility model, only the last combustion furnace can be more finely controlled, and the system control difficulty is lower.

[0036] (4) The heat storage power generation device system for energy-saving multi-furnace combustion of low-calorific-value gas provided by the present utility model recovers the heat of the circulating water by setting a heat pump, reuses the heat that was originally dissipated into the air, reduces the system energy consumption, and has significant energy-saving significance. Description of the Drawings

[0037] Figure 1It is a schematic diagram of a heat storage power generation device system for energy-saving multi-furnace combustion of low calorific value gas in the specific embodiment of the present utility model.

[0038] In the figure: 1 - combustion furnace; 2 - flue gas heat exchange device; 3 - air preheating device; 4 - gas heating device; 5 - chimney; 6 - second heat exchange medium storage device; 7 - third heat exchange medium storage device; 8 - first heat exchange medium storage device; 9 - second delivery pump; 10 - third delivery pump; 11 - first delivery pump; 12 - superheating device; 13 - evaporation device; 14 - preheating device; 15 - steam turbine; 16 - condensing device; 17 - deaerator; 18 - feed water pump; 19 - water pump; 20 - heat pump; 21 - circulation pump; 22 - cooling tower. Specific embodiment

[0039] The technical solution of the present utility model will be further described below in conjunction with the drawings and through specific embodiments.

[0040] The present utility model will be further described in detail below. However, the following examples are only simple examples of the present utility model and do not represent or limit the scope of the claimed rights of the present utility model. The scope of protection of the present utility model shall be subject to the claims.

[0041] It should be understood that in the description of the present utility model, the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0042] It should be noted that in the description of the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0043] Those skilled in the art should understand that the present utility model necessarily includes necessary pipelines, conventional valves, and general pump equipment for realizing a complete process. However, the above contents do not belong to the main inventive points of the present utility model. Those skilled in the art can add and arrange them by themselves based on the process flow and equipment structure selection, and the present utility model does not make special requirements and specific limitations on this.

[0044] As a specific embodiment of the present utility model, there is provided a heat storage power generation device system for burning low calorific value gas with multiple furnaces for energy conservation, and its schematic diagram is as Figure 1 shown.

[0045] The heat storage power generation device system includes a first heat exchange medium storage device 8, a flue gas heat exchange device 2, a second heat exchange medium storage device 6, a combustion furnace 1, and a third heat exchange medium storage device 7 that are connected in sequence; the third heat exchange medium storage device 7 is connected to a superheating device 12, an evaporation device 13, a preheating device 14, and the first heat exchange medium storage device 8 in sequence; the superheating device 12 is connected to a steam turbine 15 and a generator in sequence; the preheating device 14 is also connected to the evaporation device 13 and the superheating device 12 in sequence through a feed water pipeline;

[0046] The flue gas heat exchange device 2 includes 3 flue gas heat exchangers arranged in parallel;

[0047] The combustion furnace 1 includes 3 combustion furnaces arranged in series.

[0048] The heat storage power generation device system further includes an air preheating device 3, a gas heating device 4, and a chimney 5 that are connected to the flue gas heat exchange device 2 in sequence.

[0049] The air preheating device 3 includes 3 air preheaters arranged in parallel;

[0050] The number of the air preheaters is the same as that of the flue gas heat exchangers.

[0051] The first heat exchange medium storage device 8 is connected to the flue gas heat exchange device 2 through a first transfer pump 11;

[0052] The second heat exchange medium storage device 6 is connected to the combustion furnace 1 through a second transfer pump 9;

[0053] The third heat exchange medium storage device 7 is connected to the superheating device 12 through a third transfer pump 10.

[0054] The steam turbine 15 is respectively connected to a condensing device 16, a heat pump 20, and a deaerator 17.

[0055] The condensing device 16 is connected to the heat pump 20 in a cycle.

[0056] The condensing device 16 is connected to a cooling tower 22 and a circulating pump 21 in a cycle.

[0057] The heat pump 20 is successively connected to a water pump 19, a deaeration device 17, a feed water pump 18, and a preheating device 14.

[0058] As a specific embodiment of the present invention, a method for operating an energy-saving multi-furnace combustion low-calorific value gas heat storage power generation device system as described above is further provided. The heat exchange medium used in this system is a binary molten salt, and the working temperature is 280°C to 565°C. The first heat exchange medium storage device 8 stores molten salt at 280°C, and the third heat exchange medium storage device 7 stores molten salt at 565°C; the combustible gas used is the by-product blast furnace gas in the steel plant production process, and the combustion furnace 1 is a three-furnace series connection.

[0059] The operating method includes:

[0060] Energy storage stage: The heat exchange medium in the first heat exchange medium storage device 8 enters the flue gas heat exchange device 2 through the first transfer pump 11 and is heated, and the molten salt temperature is increased by 50°C, and then enters the second heat exchange medium storage device 6; the heat exchange medium in the second heat exchange medium storage device 6 enters the combustion furnace 1 through the second transfer pump 9 and is heated again, and the temperature is increased by 235°C. After being heated to 565°C, it enters the third heat exchange medium storage device 7 for storage;

[0061] Energy release stage: The 565°C high-temperature molten salt in the third heat exchange medium storage device 7 enters the superheating device 12, the evaporation device 13, and the preheating device 14 in sequence through the third transfer pump 10 to release heat and becomes 280°C low-temperature molten salt, and then enters the first heat exchange medium storage device 8 for storage;

[0062] The feed water is boosted and transported by the feed water pump 18, and the temperature is about 80°C to 90°C. It enters the preheating device 14, the evaporation device 13, and the superheating device 12 in sequence to absorb heat and becomes 540°C high-temperature and high-pressure steam, and then enters the steam turbine 15 to do work to drive the generator to generate electricity.

[0063] In the energy storage stage, the air enters the combustion furnace 1 after being heated by the air preheating device 3, and the flue gas enters the combustion furnace 1 after being heated by the gas heating device 4. The flue gas generated by the combustion furnace 1 releases heat through the flue gas heat exchange device 2, the air preheating device 3, and the gas heating device 4 in sequence, and then is discharged through the chimney 5;

[0064] In the energy release stage, the exhaust steam generated by the steam turbine enters the condensing device 16 and is condensed into condensed water at a temperature of about 30 - 35°C. Then it is divided into two paths. One path enters the heat pump 20 to release heat, and the other path enters the cooling tower 22 to release heat and then passes through the circulating pump 21, and is combined with the water coming out of the heat pump 20 and then returns to the condensing device 16;

[0065] Steam is extracted from the steam turbine 15, one path of the extracted steam enters the heat pump 20 as a high-temperature heat source, and the other path of the extracted steam enters the deaerator 17 as a heating and deoxygenation heat source; the extracted steam in the heat pump 20 drives the heat pump 20 to do work, and exchanges heat with the condensed water from the condensing device 16, and after the temperature rises to 80-90°C, it enters the deaerator 17 through the water pump 19; the extracted steam in the deaerator 17 heats and deoxygenates the condensed water, and after the temperature rises to 104°C, it is introduced into the preheating device 14 through the feed water pump 18.

[0066] The energy-saving multi-furnace heat storage power generation device system for burning low calorific value gas provided in this specific embodiment reduces the project cost. When a single combustion furnace meets the transportation size requirements, the temperature increase limit of the molten salt medium is about 80°C, and the configured flue gas heat exchanger increases the temperature of the molten salt medium by about 30°C. If only a single combustion furnace is used to heat the molten salt from 280°C to 565°C, the molten salt needs to be circulated in the system at least three times before the molten salt can be raised to the target temperature. Taking the energy storage scale of 10MW / 80MWh as an example, in order to meet the heat output requirements, at least 2,000 tons of binary molten salt are required. During the 8h heat storage time, if it is only circulated once, the molten salt flow rate needs to be 69.4kg / s. If the cycle is repeated three times, the flow rate of the molten salt needs to be 208.2kg / s. At this time, at least two combustion furnaces need to be connected in parallel to meet the heating demand of the molten salt, and both combustion furnaces need to be built with high-temperature resistant stainless steel. The design size, pressure loss, and carrying capacity of the corresponding pipelines also need to be doubled. The design requirements of the supporting valves, instruments, and molten salt pumps will be increased, and the operation difficulty of the system will also be greater. If the design is designed in the form of three furnaces in a row, the temperature of the molten salt will be increased step by step. The first combustion furnace can be designed with ordinary carbon steel, the second combustion furnace can be designed with ordinary stainless steel, and the third combustion furnace needs to use high-temperature resistant stainless steel. The system pipeline can be thinner, the pump head and power can be smaller, and the design requirements of valves and instruments will be reduced. The overall project cost can save millions of yuan, and the operating cost can be reduced by about 50%.

[0067] Taking the energy storage scale of 10MW / 80MWh as an example, the water flow rate is about 7.8kg / s. Assuming that the condensed water temperature is 35℃, after the heat pump recovers energy, the condensed water temperature rises to 85℃. The energy efficiency ratio of the heat pump is calculated as 1.67. In the first energy release stage, the system can recover 1.9×10 7 kJ, equivalent to 642kg standard coal, and is expected to reduce CO2 emissions by 1682kg.

[0068] The applicant declares that the detailed structural features of the present utility model are illustrated by the above embodiments, but the present utility model is not limited to the above detailed structural features, that is, it does not mean that the present utility model must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvement to the present utility model, the equivalent replacement of the components selected for the present utility model, the addition of auxiliary components, the selection of specific methods, etc. all fall within the protection scope and the disclosure scope of the present utility model.

[0069] The preferred embodiments of the present utility model have been described in detail above. However, the present utility model is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present utility model, various simple modifications can be made to the technical solution of the present utility model, and these simple modifications all belong to the protection scope of the present utility model.

Claims

1. An energy-saving multi-furnace combustion heat storage power generation device system for low calorific value gas, characterized in that, The heat storage power generation device system includes a first heat exchange medium storage device, a flue gas heat exchange device, a second heat exchange medium storage device, a combustion furnace, and a third heat exchange medium storage device connected in sequence; the third heat exchange medium storage device is connected to a superheating device, an evaporation device, a preheating device, and the first heat exchange medium storage device in sequence; the superheating device is connected to a steam turbine and a generator in sequence; the preheating device is further connected to the evaporation device and the superheating device in sequence through a feed water pipeline; The flue gas heat exchange device includes at least two flue gas heat exchangers arranged in parallel; the combustion furnace includes at least two combustion furnaces arranged in series.

2. The thermal energy storage power generation device system according to claim 1, characterized in that, The heat storage power generation device system further includes an air preheating device, a gas heating device, and a chimney connected to the flue gas heat exchange device in sequence.

3. The thermal energy storage power generation device system according to claim 2, wherein The air preheating device includes at least two air preheaters arranged in parallel.

4. The thermal energy storage power generation device system according to claim 3, characterized in that The number of the air preheaters is the same as the number of the flue gas heat exchangers.

5. The thermal energy storage power generation device system according to claim 1, characterized in that, The first heat exchange medium storage device is connected to the flue gas heat exchange device through a first transfer pump; The second heat exchange medium storage device is connected to the combustion furnace through a second transfer pump.

6. The thermal energy storage power generation device system according to claim 1, wherein The third heat exchange medium storage device is connected to the superheating device through a third transfer pump.

7. The thermal energy storage power generation device system according to claim 1, wherein The steam turbine is respectively connected to a condensing device, a heat pump, and a deaeration device.

8. The heat storage power generation device system according to claim 7, wherein The condensing device is connected to a heat pump cycle.

9. The thermal energy storage power generation device system according to claim 7, wherein, The condensing device is connected to a cooling tower and a circulating pump cycle.

10. The heat storage power generation device system according to claim 7, characterized in that, The heat pump is connected to a water pump, a deaeration device, a feed water pump, and a preheating device in sequence.

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