Peak regulation and heat storage system and method for thermal power plant

Abstract

The invention discloses a thermal power plant peak regulation heat storage system and method, and belongs to the technical field of heat storage. The system comprises a steam turbine unit and a heat storage device. The heat storage device comprises a heat storage module and a feed water heater which are arranged in a closed space, and a fan is mounted between the heat storage module and the feed water heater; the steam turbine unit is connected with an inlet of the heat storage module through a heat source pipeline, an outlet of the heat storage module is connected to the deaerator through a condensation water pipeline, and the deaerator is connected to the boiler through a first water feeding pump. An inlet of the feed water heater is connected with a second feed water pump which is connected with an outlet pipeline of the deaerator and used for providing low-temperature feed water. In the heat storage process, direct and efficient conversion between heat energy is achieved, the energy degradation problem of conversion from high-grade electric energy to low-grade heat energy in a traditional electric heating heat storage mode is avoided, and the energy utilization efficiency is further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat storage, and relates to a peak shaving heat storage system and method for a thermal power plant. Background Art

[0002] With the transformation of the global energy structure and power structure, the proportion of renewable energy (such as solar energy and wind energy) in energy supply has gradually increased. However, due to the intermittency and instability of renewable energy, its power generation output is often affected by weather conditions, resulting in increased volatility and uncertainty of power grid power supply. Therefore, in order to balance power grid power supply, improve the efficiency and stability of the power system, energy storage technology has become crucial. As a kind of energy storage technology, the heat storage technology of thermal power plants can release the stored heat when renewable energy is insufficient, providing a stable power supply for the power grid.

[0003] As a traditional power generation method, thermal power plants play an important role in the power grid. However, with the rapid development of renewable energy and the increasing complexity of power grid loads, thermal power plants need to have higher operating flexibility to meet the peak shaving requirements of the power grid. The heat storage technology stores the excess heat generated during the power generation process of thermal power plants and releases this heat for power generation or heating when the power grid needs it, thereby improving the operating flexibility and peak shaving ability of thermal power plants.

[0004] With the improvement of environmental awareness and the strengthening of environmental protection policies, thermal power plants need to pay more attention to energy conservation, emission reduction and emission reduction during the power generation process. The heat storage technology reduces the energy loss and emissions during the power generation process of thermal power plants by storing and reusing heat, and the heat storage technology of thermal power plants has also developed rapidly. At present, a variety of heat storage technologies have been applied to thermal power plants, such as molten salt heat storage, phase change heat storage, hot water heat storage, etc. These technologies have their own advantages and disadvantages, but they all improve the operating efficiency and flexibility of thermal power plants to varying degrees.

[0005] Among them, solid heat storage technology is a technology that uses solid materials to store thermal energy and release thermal energy when needed. This technology is widely used in heating, hot water supply, industrial heating and other fields, and has the advantages of high efficiency, environmental protection, energy conservation, etc. Its basic principle is that during periods of low power demand or low electricity prices (such as night valley periods), electrical energy is converted into thermal energy through an electric heating element and stored in the solid heat storage material. When thermal energy is needed, the stored thermal energy is released through a specific heat exchange process to meet the needs of heating, hot water supply, etc. Most of the existing solid heat storage technologies are electric heating heat storage technologies, which have the conversion of energy grade from high to low, do not conform to the basic law of energy utilization, have low heat storage efficiency, and the heat storage material is magnesia brick, with a high price. Summary of the Invention

[0006] The object of the present invention is to provide a peak shaving heat storage system and method for a thermal power plant, so as to solve the technical problems in the prior art that the peak shaving heat storage efficiency and energy utilization efficiency of the thermal power plant are low, and the cost is high.

[0007] To achieve the above object, the present invention adopts the following technical solutions: In the first aspect, the present invention provides a peak shaving heat storage system for a thermal power plant, including a steam turbine unit and a heat storage device; the heat storage device includes a heat storage module and a feed water heater in a closed space, and a fan is installed between the heat storage module and the feed water heater; the steam turbine unit is connected to the inlet of the heat storage module through a heat source pipeline, the outlet of the heat storage module is connected to the deaerator through a condensate pipeline, and the deaerator is connected to the boiler through a first feed water pump; the inlet of the feed water heater is connected to a second feed water pump, and the second feed water pump is connected to the outlet pipeline of the deaerator for providing low-temperature feed water.

[0008] Further, the steam turbine unit includes a steam turbine high-pressure cylinder, a steam turbine intermediate-pressure cylinder and a steam turbine low-pressure cylinder connected in sequence; the steam turbine high-pressure cylinder is connected with an intermediate-pressure steam extraction pipeline; the steam turbine intermediate-pressure cylinder is connected with a low-pressure steam extraction pipeline; both the intermediate-pressure steam extraction pipeline and the low-pressure steam extraction pipeline are connected to the heat source pipeline.

[0009] Further, the heat storage module includes a heat storage material main body; a plurality of heat exchange pipelines and heat exchange air ducts are evenly arranged at intervals in the heat storage material main body; the inlet of the heat exchange pipeline is connected to the heat source pipeline, and the outlet is connected to the condensate pipeline.

[0010] Further, a plurality of fins are arranged on the outer wall of the heat exchange pipeline.

[0011] Further, the heat storage material main body is made of high-strength concrete.

[0012] Further, a heat preservation layer is arranged on the periphery of the heat storage device.

[0013] Further, a branch of the condensate pipeline is also connected to the inlet of a water tank, and the outlet of the water tank is connected to the deaerator.

[0014] Further, a first valve and a second valve are installed on the condensate pipeline; the first valve is located on the branch close to the water tank; the second valve is located on the branch close to the deaerator.

[0015] In the second aspect, the present invention provides a peak shaving heat storage method for a thermal power plant, based on the above-mentioned peak shaving heat storage system for a thermal power plant, including the following steps: During heat storage, steam of the steam turbine unit is extracted through the heat source pipeline; the steam is sent into the heat storage module in the heat storage device for heat exchange from top to bottom, and after the heat exchange, it becomes condensate, and the condensate is recovered through the condensate pipeline. During heat release, the fan is turned on to make the air circulate in the heat storage module, and the hot air is obtained with the wind direction from bottom to top; the low-temperature feed water is supplied to the feed water heater through the second feed water pump; the low-temperature feed water in the feed water heater exchanges heat with the hot air in a countercurrent manner, and the hot air transfers heat to the low-temperature feed water through convection and heat conduction to achieve heat release.

[0016] Furthermore, the step of recovering the condensed water through the condensed water pipeline specifically includes: Close the first valve and open the second valve; the condensed water returns to the boiler through the condensed water pipeline for recovery; Open the first valve and close the second valve; the condensed water enters the water tank through the condensed water pipeline for storage and recovery.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a peak shaving heat storage system and method for a thermal power plant. During heat storage, medium-temperature steam or low-temperature steam enters the heat storage device through the heat source pipeline. The steam passes through the heat exchange pipeline from top to bottom through the main body of the heat storage material, and transfers heat to the main body of the heat storage material through convection inside the pipe and heat conduction through the pipe wall, increasing the temperature of the main body of the heat storage material. After heat storage, the steam becomes condensed water and returns to the thermal power system of the power plant. The fan does not work during heat storage; during heat release, the feed water from the outlet of the deaerator is sent into the feed water heater through the second feed water pump, and the fan heats the feed water by flowing the heat in the main body of the heat storage material in the form of hot air from top to bottom in the feed water heater. In the heat storage device of the present invention, the heat exchange pipeline is laid in the main body of the heat storage material during heat storage, and the fan and the feed water heater are used to extract heat during heat release. The heat storage and heat release systems are two independent systems that do not interfere with each other, and the heat storage and heat release can be carried out synchronously. The heat storage process of the present invention realizes the direct and efficient conversion of thermal energy, avoiding the energy degradation problem of the conversion from high-grade electric energy to low-grade thermal energy in the traditional electric heating heat storage method, and further improving the energy utilization efficiency.

[0018] Furthermore, the high-pressure cylinder of the steam turbine in the system of the present invention is connected to the heat source pipeline through the medium-pressure steam extraction pipeline, and the intermediate-pressure cylinder of the steam turbine is connected to the heat source pipeline through the low-pressure steam extraction pipeline. The surplus medium-temperature or low-temperature steam during the peak shaving period of the thermal power plant can be selectively used to heat the heat storage body, and correspondingly, hot water and industrial steam can be supplied externally. The peak shaving income and heating income of the power plant can be increased.

[0019] Furthermore, the temperature of the condensed water in the heat storage device of the system of the present invention matches the temperature of the water in the deaerator, and it can be directly returned to the deaerator to improve the thermal efficiency of the unit; when the condensed water flow rate is too large, it can enter the water tank for temporary storage, and the operation mode has strong flexibility. Description of the Drawings

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the peak shaving heat storage system of the thermal power plant of the present invention; Figure 2 It is a schematic diagram of the structure of the main body of the heat storage material of the embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of the heat storage module of the embodiment of the present invention; Figure 4 It is a schematic diagram of the heat exchange pipeline of the embodiment of the present invention.

[0022] Wherein: 1 - high-pressure cylinder of steam turbine; 2 - intermediate-pressure cylinder of steam turbine; 3 - low-pressure cylinder of steam turbine; 4 - intermediate-pressure steam extraction pipeline; 5 - low-pressure steam extraction pipeline; 6 - heat source pipeline; 7 - main body of heat storage material; 8 - thermal insulation layer; 9 - heat exchange pipeline; 10 - feedwater heater; 11 - water tank; 12 - deaerator; 13 - first valve; 14 - second valve; 15 - first feed water pump; 16 - second feed water pump; 17 - condensate pipeline; 18 - fan; 19 - heat exchange air duct. Specific Embodiments

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0026] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. This is only for the convenience of describing the present invention 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. Therefore, it should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0027] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0028] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "linked" are used, they 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The following further describes the present invention in detail with reference to the drawings: See Figure 1, an embodiment of the present invention discloses a peak shaving and heat storage system for a thermal power plant, which includes a steam turbine unit and a heat storage device; the heat storage device includes a heat storage module and a feed water heater 10 within a sealed space. A fan 18 is installed between the heat storage module and the feed water heater 10. The fan 18 is a high-temperature resistant fan, which can make the hot air circulate from top to bottom on the side of the feed water heater 10; the steam turbine unit is connected to the inlet of the heat storage module through a heat source pipeline 6, and the outlet of the heat storage module is connected to the deaerator 12 through a condensate pipeline 17. The deaerator 12 is connected to the boiler through a first feed water pump 15; the inlet of the feed water heater 10 is connected to a second feed water pump 16, and the second feed water pump 16 is connected to the outlet pipeline of the deaerator 12 to provide low-temperature feed water. In the power industry, especially in the context that thermal power units need to frequently perform deep peak shaving to adapt to the fluctuations of the power grid demand, the system of the present invention can effectively utilize the surplus reheated steam or extraction steam from the intermediate pressure cylinder of the unit, convert it into heat energy and store it in a special heat storage body. When the thermal power unit needs to increase the load and generate electricity at the peak, these stored heat energies can be quickly released, thereby reducing the demand for direct extraction steam from the unit, and then increasing the electricity fed into the grid, bringing significant economic benefits to the power plant. In addition, when the unit performs deep peak shaving operation, the system effectively alleviates the problem that the boiler cannot further reduce the load due to the limitation of the minimum stable combustion load, thus ensuring the safe and stable operation of the generating unit. Particularly importantly, the heat storage process of the present invention realizes the direct and efficient conversion of heat energy, avoiding the energy degradation problem of the conversion from high-grade electric energy to low-grade heat energy in the traditional electric heating heat storage method, and further improving the energy utilization efficiency.

[0030] In a feasible embodiment of the present invention, the steam turbine unit includes a steam turbine high-pressure cylinder 1, a steam turbine intermediate-pressure cylinder 2, and a steam turbine low-pressure cylinder 3 connected in sequence; the steam turbine high-pressure cylinder 1 is connected with an intermediate-pressure steam extraction pipeline 4; the steam turbine intermediate-pressure cylinder 2 is connected with a low-pressure steam extraction pipeline 5; both the intermediate-pressure steam extraction pipeline 4 and the low-pressure steam extraction pipeline 5 are connected to the heat source pipeline 6. In this embodiment, the intermediate-pressure steam extraction pipeline 4 and the low-pressure steam extraction pipeline 5 do not extract steam simultaneously. When external users need hot water, the steam in the low-pressure steam extraction pipeline 5 is extracted to heat the heat storage body. When external users need medium- and low-temperature industrial steam, the steam in the intermediate-pressure steam extraction pipeline 4 is extracted to heat the heat storage body. The medium-temperature or low-temperature steam surplus during the peak shaving period of the thermal power plant can be selectively used to heat the heat storage body, and correspondingly, hot water and industrial steam can be supplied externally. The peak shaving income and heating income of the power plant can be increased.

[0031] In a feasible embodiment of the present invention, see Figure 3 and Figure 4 , the heat storage module includes a heat storage material main body 7; a number of heat exchange pipes 9 and heat exchange air ducts 19 are evenly arranged at intervals in the heat storage material main body 7, as Figure 2As shown; the inlet of the heat exchange pipe 9 is connected to the heat source pipe 6, and the outlet is connected to the condensate pipe 17. Preferably, the heat exchange pipe 9 is a coiled pipe, and the outer wall of the heat exchange pipe 9 is provided with a number of fins for enhancing the heat exchange performance; a heat preservation layer 8 is arranged around the heat storage device for heat preservation to enhance the heat storage capacity. In this embodiment, the heat exchange air ducts 19 and the heat exchange pipes 9 are uniformly arranged in the heat storage material body 7, so that the system can store and release heat evenly; the flow direction of the heating steam in the heat exchange pipe 9 is from top to bottom, and at the same horizontal height, multiple heat exchange pipes 9 are arranged in parallel for heat exchange at the same time. After the steam heats the heat storage body at this horizontal height, it enters the lower layer to continue heating the heat storage body in the lower layer. The heat storage device is modularly designed, and the processed modules are transported to the site for combination to adapt to the final parameters, or the raw materials can be transported to the site for on-site processing.

[0032] In a feasible embodiment of the present invention, the condensate pipe 17 of the system of the present invention is provided with two branch roads. One branch road is connected to the deaerator 12, and the other branch road is connected to the inlet of the water tank 11. The outlet of the water tank 11 is connected to the deaerator 12. A first valve 13 and a second valve 14 are also installed on the condensate pipe 17; the first valve 13 is located on the branch road close to the water tank 11; the second valve 14 is located on the branch road close to the deaerator 12. By controlling the valves, the condensate can directly return to the deaerator 12 to improve the thermal efficiency of the unit; when the condensate flow rate is too large, it can enter the water tank 11 for temporary storage, and the operation mode has strong flexibility.

[0033] The embodiment of the present invention discloses a peak shaving heat storage method for a thermal power plant. Based on the above-mentioned peak shaving heat storage system for a thermal power plant, it includes the following steps: During heat storage, steam from the steam turbine unit is extracted through the heat source pipe 6; the steam is sent to the heat storage module in the heat storage device for heat exchange from top to bottom, and after the heat exchange, it becomes condensate, and the condensate is recovered through the condensate pipe 17; During heat release, the fan 18 is turned on to make the air circulate in the heat storage module, and the wind direction is from bottom to top to obtain hot air; the second feed water pump 16 is used to provide low-temperature feed water to the feed water heater 10; the low-temperature feed water in the feed water heater 10 forms a countercurrent heat exchange with the hot air, and the hot air transfers heat to the low-temperature feed water through convection and heat conduction to achieve heat release.

[0034] In a feasible embodiment of the present invention, the step of recovering the condensate through the condensate pipe 17 specifically includes: Close the first valve 13 and open the second valve 14; the condensate returns to the boiler through the condensate pipe 17 for recovery; Open the first valve 13 and close the second valve 14; the condensate enters the water tank 11 through the condensate pipe 17 for storage and recovery.

[0035] The working process of the present invention is as follows: 1. Only heat storage without heat release condition 1. According to the heat user's demand, steam is extracted from the medium-pressure steam extraction pipeline 4 or the low-pressure steam extraction pipeline 5, and the steam is sent into the heat storage device through the heat source pipeline 6. In the heat storage device, the steam flows downward step by step. As heat is released, a phase change will occur in the heat exchange pipeline 9. After releasing heat, it becomes condensate and is sent into the deaerator 12 of the original power plant's thermal system or the newly added water tank 11 through the condensate pipeline 17; 2. During the heat storage process, the temperature of the high-strength concrete gradually increases, and the upper temperature is higher than the lower temperature; 3. During the entire heat storage process, the fan 18 and the feed water heater 10 do not work.

[0036] 2. Only heat release without heat storage condition 4. Turn on the fan 18 to make the air circulate in the heat exchange air duct 19 of the heat storage material body 7, and ensure that the wind direction makes it flow from top to bottom on one side of the feed water heater 10; 5. The second feed water pump 16 provides low-temperature feed water, which passes through the heat exchange surface of the feed water heater 10 from bottom to top, forming countercurrent heat exchange with the hot air. The hot air transfers heat to the low-temperature feed water in the heat exchanger tube through convection and heat conduction, continuously increasing the feed water temperature; 6. The hot air circulates in the heat exchange air duct 19 of the heat storage material body 7, transferring heat to the feed water. When the working medium parameters at the outlet of the feed water heater 10 reach the target requirements, the heat release ends.

[0037] 7. During the entire process, no steam is introduced into the heat exchange pipeline 9.

[0038] 3. Heat storage and heat release simultaneously condition Steps 1, 4, and 5 are carried out simultaneously, and the two systems of heat storage and heat release do not interfere with each other.

[0039] The working principle of the present invention is as follows: During heat storage, medium-temperature steam or low-temperature steam enters the heat storage device through the heat source pipeline 6. The steam passes through the heat exchange pipeline 9 from top to bottom through the heat storage material body 7, and transfers heat to the high-strength concrete material through convection inside the pipe and heat conduction through the pipe wall, increasing the temperature of the concrete material. After heat storage, the steam becomes condensate and returns to the power plant thermal system. The fan 18 does not work during heat storage; During heat release, the feed water from the outlet of the deaerator 12 is sent into the feed water heater 10 by the second feed water pump 16 to supply low-temperature water. The fan 18 transfers the heat in the concrete in the form of hot air to flow from top to bottom in the feed water heater 10 to heat the feed water.

[0040] In the heat storage device of the present invention, the heat exchange pipeline 9 is laid in the heat storage material main body 7 during heat storage, and the fan 18 and the feed water heater 10 are used to extract heat during heat release. The heat storage and heat release systems are two independent systems that do not interfere with each other, and the heat storage and heat release can be carried out synchronously. The heat storage process of the present invention realizes the direct and efficient conversion of thermal energy, avoiding the energy degradation problem of the conversion from high-grade electric energy to low-grade thermal energy in the traditional electric heating heat storage method, and further improving the energy utilization efficiency.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A peak load storage system for a thermal power plant, characterized in that: The invention comprises a steam turbine unit and a heat storage device; the heat storage device comprises a heat storage module and a feed water heater (10) in a closed space, and a fan (18) is installed between the heat storage module and the feed water heater (10); the steam turbine unit is connected to the inlet of the heat storage module through a heat source pipeline (6), the outlet of the heat storage module is connected to a deaerator (12) through a condensate pipeline (17), and the deaerator (12) is connected to a boiler through a first feed water pump (15); the inlet of the feed water heater (10) is connected to a second feed water pump (16), and the second feed water pump (16) is connected to the outlet pipeline of the deaerator (12) for providing low-temperature feed water.

2. A thermal power plant peak load storage system according to claim 1, characterized in that: The steam turbine unit comprises a steam turbine high-pressure cylinder (1), a steam turbine intermediate-pressure cylinder (2) and a steam turbine low-pressure cylinder (3) which are connected in sequence; the steam turbine high-pressure cylinder (1) is connected to an intermediate-pressure steam extraction pipeline (4); the steam turbine intermediate-pressure cylinder (2) is connected to a low-pressure steam extraction pipeline (5); and the intermediate-pressure steam extraction pipeline (4) and the low-pressure steam extraction pipeline (5) are both connected to a heat source pipeline (6).

3. A thermal power plant peak load storage system according to claim 1, characterized in that: The heat storage module comprises a heat storage material body (7); a plurality of heat exchange pipes (9) and heat exchange air ducts (19) are evenly spaced in the heat storage material body (7); the inlet of the heat exchange pipe (9) is connected to the heat source pipe (6), and the outlet is connected to the condensate water pipe (17).

4. A thermal power plant peak load storage system according to claim 3, characterized in that: The outer wall of the heat exchange pipe (9) is provided with a plurality of fins.

5. A thermal power plant peak load storage system according to claim 3, characterized in that: The heat storage material body (7) is made of high-strength concrete.

6. A thermal power plant peak load storage system according to claim 1, characterized in that: A heat-insulating layer (8) is arranged on the periphery of the heat storage device.

7. A thermal power plant peak load storage system according to claim 1, characterized in that: The condensate water pipeline (17) is also provided with a branch connected to the inlet of the water tank (11), and the outlet of the water tank (11) is connected to the deaerator (12).

8. A thermal power plant peak load storage system according to claim 7, characterized in that: A first valve (13) and a second valve (14) are installed on the condensate water pipeline (17); the first valve (13) is located on a branch line close to the water tank (11); and the second valve (14) is located on a branch line close to the deaerator (12).

9. A peak load storage method for a thermal power plant, characterized in that: A peak load storage system for a thermal power plant according to any one of claims 1 to 8 comprises the following steps: During heat storage, steam from the steam turbine unit is extracted through the heat source pipeline (6); the steam is sent to the heat storage module in the heat storage device for heat exchange from top to bottom, and after the heat exchange is completed, it is converted into condensed water, which is recovered through the condensed water pipeline (17); When releasing heat, the fan (18) is turned on to circulate air in the heat storage module, with the wind blowing from bottom to top to obtain hot air; low-temperature feed water is provided to the feed water heater (10) through the second feed water pump (16); the low-temperature feed water in the feed water heater (10) forms a countercurrent heat exchange with the hot air, and the hot air transfers heat to the low-temperature feed water through convection and heat conduction, thereby achieving heat release.

10. A peak load storage method for a thermal power plant according to claim 9, characterized in that: The step of recovering the condensate through the condensate pipeline (17) specifically comprises: The first valve (13) is closed and the second valve (14) is opened; the condensate is returned to the boiler through the condensate pipe (17) for recovery; The first valve (13) is opened, and the second valve (14) is closed; the condensed water enters the water tank (11) through the condensed water pipeline (17) for storage and recovery.

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