Thermal power plant peak cooling system and thermal power plant

Abstract

The utility model provides a thermal power plant peak cooling system and a thermal power plant, and relates to the field of thermal power plants, and the cooling system comprises a mechanical ventilation tower and a plurality of condensation systems correspondingly communicated with a steam turbine. The condensation system comprises a steam turbine exhaust steam input port, a condensation water output port, a direct air cooling device and a surface type condensation device, wherein the direct air cooling device and the surface type condensation device are connected between the steam turbine exhaust steam input port and the condensation water output port in parallel. The surface type steam condensing device is used for cooling steam turbine exhaust steam input into the corresponding steam turbine through cooling water circulating in the surface type steam condensing device so as to form condensed water, and the condensed water is output to the condensed water output port. And the mechanical ventilation tower is communicated with the plurality of surface type condensing devices and is used for cooling the cooling water circulating in the surface type condensing devices and circulating the cooling water back to the surface type condensing devices of the plurality of condensing systems. According to the peak cooling system of the thermal power plant, the cooling effect of the cooling system can be guaranteed, and the operation safety and stability of the cooling system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal power plants, in particular to a peak cooling system for a thermal power plant and a thermal power plant. Background Art

[0002] Thermal power plants are power generation facilities that use fossil fuels, such as coal, oil or natural gas, to convert the heat energy generated by combustion into electrical energy. In my country, thermal power plants are an important part of power production and play a vital role in meeting the daily electricity needs of society and people. Air-cooled units are power generation units in thermal power plants that use air as a cooling medium. In some arid and water-scarce areas, water use issues are more prominent. Vigorously developing air-cooled units can save more than 2 / 3 of water consumption compared to wet-cooled units. Looking to the future, the prospects for air-cooling technology in power plants are still promising. It is not only used in water-scarce areas, but also in areas with abundant water resources. From the perspective of reducing water consumption and promoting the sustainable use of water resources, it also has very high practical application value.

[0003] In the prior art, direct air cooling systems are usually used, with air as the cold and hot medium, and heat exchange is mainly carried out through convection on the surface of the radiator. When the grid load is too large, once there are unfavorable factors such as strong winds and hot air backflow, it is very easy to cause a significant increase in back pressure, reaching the turbine protection action and tripping, insufficient condensing capacity, and the unit cannot operate at full load. Utility Model Content

[0004] In view of the technical problem in the prior art that the condensing capacity is insufficient and the unit cannot operate at full load, the utility model provides a peak cooling system for a thermal power plant and a thermal power plant. The peak cooling system for the thermal power plant can ensure the cooling effect of the cooling system and improve the operating safety and stability of the cooling system.

[0005] To achieve the above-mentioned purpose, the first aspect of the utility model provides a peak cooling system for a thermal power plant, which comprises: a plurality of condensation systems connected to the steam turbines, each condensation system comprising: a steam turbine exhaust inlet, a condensate outlet, and a direct air cooling device and a surface condensation device connected in parallel between the steam turbine exhaust inlet and the condensate outlet; the direct air cooling device is used to use air to cool the steam turbine exhaust input from the corresponding steam turbine to form condensate, and output the condensate to the condensate outlet; the surface condensation device is used to use cooling water flowing in the surface condensation device to cool the steam turbine exhaust input from the corresponding steam turbine to form condensate, and output the condensate to the condensate outlet; a mechanical ventilation tower is connected to the surface condensation devices of the plurality of condensation systems, and is used to cool the cooling water flowing in the surface condensation devices, and circulate the cooled cooling water back to the surface condensation devices of the plurality of condensation systems.

[0006] Furthermore, the direct air cooling device includes: a direct air cooling island and a first condensate pump connected in series in sequence; the direct air cooling island is used to use air to cool the steam turbine exhaust steam input from the corresponding steam turbine to form condensate; the first condensate pump is used to output the condensate formed by the direct air cooling island to the condensate output port; the surface condensing device includes: a surface condenser and a second condensate pump connected in series in sequence; the surface condenser is used to use cooling water circulating in the surface condenser to cool the steam turbine exhaust steam input from the corresponding steam turbine to form condensate, and the second condensate pump is used to output the condensate formed by the surface condenser to the condensate output port; the mechanical ventilation tower is connected to the surface condensers of multiple condensation systems, and is used to cool the cooling water circulating in the surface condenser, and circulate the cooled cooling water back to the surface condensers of multiple condensation systems.

[0007] Furthermore, each condensation system also includes: a cooling control valve, which is arranged on the connecting pipeline between the steam turbine exhaust input port and the surface condenser, and is used to control the flow rate of the steam turbine exhaust input to the surface condenser.

[0008] Furthermore, the peak cooling system of the thermal power plant also includes: a heat exchange device, which is arranged on the connecting pipeline between the cooling water outlet of the mechanical ventilation tower and the cooling water inlet of the surface condenser, and is used for secondary cooling of the cooling water output by the mechanical ventilation tower.

[0009] Furthermore, the heat exchange device includes: a water reservoir for storing cooling water; a heat exchanger having a cooling water pipe and a cooling water pipe, the cooling water pipe is used to transport the cooling water output by the mechanical ventilation tower, and the cooling water pipe is used to transport the cooling water stored in the water reservoir, and the cooling water in the cooling water pipe can exchange heat with the cooling water in the cooling water pipe to cool the cooling water in the cooling water pipe; a cooling water pump is arranged on the connecting pipeline between the water reservoir and the water inlet of the cooling water pipe, and is used to control the flow rate of cooling water in the cooling water pipe.

[0010] Furthermore, the water reservoir comprises: a plurality of sub-water reservoirs, which are sequentially connected in series between the water outlet of the cooling water pipe and the cooling water pump through pipelines.

[0011] Furthermore, the heat exchange device also includes: a photovoltaic component, which is arranged on the water surface of the sub-reservoir and is used to supply power to the cooling water pump.

[0012] Furthermore, the peak cooling system of the thermal power plant also includes: a cooling water tank, which is arranged between the cooling water outlets of the surface condensers of multiple condensation systems and the cooling water inlet of the mechanical ventilation tower, and is used to store the cooling water output by the surface condensers of multiple condensation systems.

[0013] Furthermore, the peak cooling system of the thermal power plant also includes: a cooling water return tank, which is arranged between the cooling water outlet of the mechanical ventilation tower and the cooling water inlet and outlet of the surface condensers of multiple condensation systems, and is used to store the cooling water output by the mechanical ventilation tower.

[0014] A second aspect of the utility model provides a thermal power plant, comprising the thermal power plant peak cooling system described above.

[0015] Through the technical solution provided by the utility model, the utility model has at least the following technical effects:

[0016] The peak cooling system of a thermal power plant of the utility model comprises: a mechanical ventilation tower and a plurality of condensation systems correspondingly connected to the steam turbine. Each condensation system comprises: a steam turbine exhaust input port, a condensate output port, and a direct air cooling device and a surface condensation device connected in parallel between the steam turbine exhaust input port and the condensate output port. The direct air cooling device is used to use air to cool the steam turbine exhaust input from the corresponding steam turbine to form condensate, and output the condensate to the condensate output port. The surface condensation device is used to use the cooling water circulating in the surface condensation device to cool the steam turbine exhaust input from the corresponding steam turbine to form condensate, and output the condensate to the condensate output port. The mechanical ventilation tower is connected to the surface condensation devices of the plurality of condensation systems, and is used to cool the cooling water circulating in the surface condensation device, and circulate the cooled cooling water back to the surface condensation devices of the plurality of condensation systems. The peak cooling system of a thermal power plant provided by the utility model can ensure the cooling effect of the cooling system and improve the operating safety and stability of the cooling system.

[0017] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0019] Figure 1 A schematic diagram of a peak cooling system for a thermal power plant provided in an embodiment of the utility model.

[0020] Description of Reference Numerals

[0021] 1-direct air cooling device; 2-surface condensing device; 3-mechanical ventilation tower; 4-cooling control valve; 5-heat exchange device; 6-cooling water tank; 7-cooling water return tank; 8-cooling water pump; 9-return water pump; 11-direct air cooling island; 12-first condensate pump; 21-surface condenser; 22-second condensate pump; 51-water reservoir; 52-heat exchanger; 53-cooling water pump; 54-photovoltaic module. DETAILED DESCRIPTION

[0022] The specific implementation of the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the utility model, and is not used to limit the embodiment of the utility model.

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0024] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings or are used to describe the relative positional relationships of components in the vertical, perpendicular or gravity direction.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0026] Please refer to Figure 1 , the utility model embodiment provides a layout transplantation method, the peak cooling system of the thermal power plant includes: a plurality of condensation systems connected to the steam turbines, each condensation system includes: a steam turbine exhaust input port, a condensate output port and a direct air cooling device 1 and a surface condensation device 2 connected in parallel between the steam turbine exhaust input port and the condensate output port; the direct air cooling device 1 is used to use air to cool the steam turbine exhaust input from the corresponding steam turbine to form condensate, and output the condensate to the condensate output port; the surface condensation device 2 is used to use the cooling water flowing in the surface condensation device 2 to cool the steam turbine exhaust input from the corresponding steam turbine to form condensate, and output the condensate to the condensate output port; the mechanical ventilation tower 3 is connected to the surface condensation devices 2 of the plurality of condensation systems, and is used to cool the cooling water flowing in the surface condensation device 2, and circulate the cooled cooling water back to the surface condensation devices 2 of the plurality of condensation systems.

[0027] Specifically, in the embodiment of the utility model, the thermal power plant includes a plurality of steam turbine generator sets, each steam turbine corresponds to a condensation system, each condensation system has a steam turbine exhaust steam input port and a condensate output port, and a direct air cooling device 1 and a surface condensation device 2 are connected in parallel between the steam turbine exhaust steam input port and the condensate output port. The steam turbine exhaust steam output by the steam turbine is partially input to the direct air cooling device 1, and partially input to the surface condensation device 2. The direct air cooling device 1 is used to use air to cool the steam turbine exhaust steam input from the corresponding steam turbine to form condensate, and output the condensate to the condensate output port. Cooling water flows in the surface condensation device 2, which can cool the steam turbine exhaust steam input from the corresponding steam turbine to form condensate, and output the condensate to the condensate output port. The mechanical ventilation tower 3 is connected to the surface condensing devices 2 of multiple condensing systems. The cooling water flowing in the surface condensing devices 2 is heated up and discharged after cooling the exhaust steam of the steam turbine, and flows into the mechanical ventilation tower 3. The mechanical ventilation tower 3 cools the cooling water of the multiple surface condensing devices 2, and then circulates the cooled cooling water back to the multiple surface condensing devices 2.

[0028] The peak cooling system of a thermal power plant provided by the utility model can share the cooling and temperature reduction pressure for a direct air cooling device, ensure the cooling effect of the cooling system, and improve the operating safety and stability of the cooling system.

[0029] Furthermore, the direct air cooling device 1 includes: a direct air cooling island 11 and a first condensate pump 12 connected in series in sequence; the direct air cooling island 11 is used to use air to cool the steam turbine exhaust steam input from the corresponding steam turbine to form condensate; the first condensate pump 12 is used to output the condensate formed by the direct air cooling island 11 to the condensate output port; the surface condensing device 2 includes: a surface condenser 21 and a second condensate pump 22 connected in series in sequence; the surface condenser 21 is used to use the cooling water flowing in the surface condenser 21 to cool the steam turbine exhaust steam input from the corresponding steam turbine to form condensate, and the second condensate pump 22 is used to output the condensate formed by the surface condenser 21 to the condensate output port; the mechanical ventilation tower 3 is connected to the surface condensers 21 of multiple condensation systems, and is used to cool the cooling water flowing in the surface condenser 21, and circulate the cooled cooling water back to the surface condensers 21 of multiple condensation systems.

[0030] Specifically, in the embodiment of the utility model, the direct air cooling device 1 includes a direct air cooling island 11 and a first condensate pump 12 connected in series in sequence, the direct air cooling island 11 has an air inlet and a liquid outlet, the steam turbine exhaust steam input by the corresponding steam turbine is input into the direct air cooling island 11 from the air inlet, the direct air cooling island 11 uses air to cool the steam turbine exhaust steam and then forms condensate, which flows out through the liquid outlet. The first condensate pump 12 outputs the condensate formed by the direct air cooling island 11 to the condensate outlet.

[0031] The surface condenser 21 has an air inlet, a liquid outlet, a cooling water inlet hole and a cooling water outlet. The exhaust steam from the corresponding steam turbine is input into the surface condenser 21 from the air inlet. Cooling water pipes are arranged on the surface of the surface condenser 21. Cooling water enters the cooling water pipes from the cooling water inlet to cool the exhaust steam from the steam turbine and then form condensed water. The condensed water flows out through the liquid outlet, and the heated cooling water flows out from the cooling water outlet.

[0032] The mechanical ventilation tower 3 is connected to the cooling water pipes of the plurality of surface condensers 21 , and is used to cool the cooling water flowing out of the surface condensers 21 , and circulate the cooled cooling water back to the plurality of surface condensers 21 .

[0033] According to the peak cooling system of a thermal power plant provided by the utility model, the added mechanical ventilation tower 3 and the surface condenser 21 can share the cooling pressure for the direct air cooling device, ensure the cooling effect of the cooling system, and improve the operating safety and stability of the cooling system.

[0034] Furthermore, each condensation system also includes: a cooling control valve 4 , which is arranged on the connecting pipeline between the steam turbine exhaust input port and the surface condenser 21 , and is used to control the flow rate of the steam turbine exhaust input to the surface condenser 21 .

[0035] Specifically, in the embodiment of the utility model, in the direct air cooling device 1, air is used as a cold and hot medium, and mainly conducts convection heat exchange through the surface of the radiator, and its operating performance is deeply affected by the ambient temperature. The summer operating condition is in the peak summer high-load operation period of the power grid, and the daily maximum load of the steam turbine is also the period when the ambient temperature is the highest. Therefore, the steam turbine will inevitably have a long period of high load, high back pressure or even limited load operation in the summer. In this case, once unfavorable factors such as strong winds and hot air reflux occur, it is very easy to cause a significant increase in back pressure, reaching the turbine protection action and tripping, the unit cannot operate at full load, and the condensing capacity is reduced. Therefore, in this embodiment, a cooling control valve 4 is set on the connecting pipeline between the steam turbine exhaust inlet and the surface condenser 21, and the cooling control valve 4 can control the flow of steam turbine exhaust input to the surface condenser 21. When the ambient temperature is greater than the set temperature, part of the steam turbine exhaust is transported to the surface condenser 21 to share the condensing pressure for the direct air cooling device 1.

[0036] The peak cooling system of a thermal power plant provided by the utility model can share the condensation pressure for the direct air cooling device during high-load operation, thereby reducing the load of the cooling system and improving the condensation capacity of the cooling system.

[0037] Furthermore, the peak cooling system of the thermal power plant also includes: a heat exchange device 5, which is arranged on the connecting pipeline between the cooling water outlet of the mechanical ventilation tower 3 and the cooling water inlet of the surface condenser 21, and is used for secondary cooling of the cooling water output by the mechanical ventilation tower 3.

[0038] Specifically, in the embodiment of the utility model, a heat exchange device 5 is provided on the connecting pipeline between the cooling water outlet of the mechanical ventilation tower 3 and the cooling water inlet of the surface condenser 21. After the cooling water is cooled in the mechanical ventilation tower 3, it flows out of the mechanical ventilation tower 3 and then flows into the heat exchange device 5 for secondary cooling of the cooling water.

[0039] According to the peak cooling system of a thermal power plant provided by the utility model, the cooling water can be cooled secondary, thereby improving the cooling effect of the surface condenser 21 and improving the condensing capacity of the cooling system.

[0040] Furthermore, the heat exchange device 5 includes: a water reservoir 51 for storing cooling water; a heat exchanger 52, having a cooling water pipe and a cooling water pipe, the cooling water pipe is used to transport the cooling water output by the mechanical ventilation tower 3, and the cooling water pipe is used to transport the cooling water stored in the water reservoir 51, and the cooling water in the cooling water pipe can exchange heat with the cooling water in the cooling water pipe to cool the cooling water in the cooling water pipe; a cooling water pump 53, which is arranged on the connecting pipeline between the water reservoir 51 and the water inlet of the cooling water pipe, and is used to control the flow rate of the cooling water in the cooling water pipe.

[0041] Specifically, in the embodiment of the utility model, the heat exchange device 5 is a water-to-water heat exchange device, including a water reservoir 51, a heat exchanger 52 and a cooling water pump 53. Cooling water is stored in the water reservoir 51, and a cooling water pipe and a cooling water pipe are provided in the heat exchanger 52. The cooling water pipe, the water reservoir 51 and the cooling water pump 53 are connected in sequence. After the cooling water is output from the mechanical ventilation tower 3, it flows into the cooling water pipe of the heat exchanger 52, and exchanges heat with the cooling water in the cooling water pipe to reduce the temperature of the cooling water. The cooling water after cooling again flows out of the cooling water pipe and is input into the surface condenser 21. The cooling water in the cooling water pipe flows into the water reservoir 51 after the cooling water is heated by heat exchange with the cooling water, and is cooled in the water reservoir 51. After the temperature is lowered, it is circulated back to the cooling water pipe through the cooling water pump 53.

[0042] Furthermore, the water reservoir 51 includes: a plurality of sub-water reservoirs, which are connected in series between the water outlet of the cooling water pipe and the cooling water pump 53 through pipelines.

[0043] Specifically, in the embodiment of the utility model, the water reservoir 51 includes a plurality of sub-reservoirs connected in series in sequence. The sub-reservoirs are independent of each other, and two adjacent sub-reservoirs are connected by pipelines. After the cooling water flows into one of the sub-reservoirs, it is cooled in the sub-reservoir, and then flows into the next sub-reservoir through the pipeline, and continues to be cooled in the next sub-reservoir.

[0044] According to the peak cooling system of a thermal power plant provided by the utility model, cooling water can be cooled in multiple stages through multiple sub-water storage tanks, thereby improving the cooling effect of warm water, enabling better heat exchange with cooling water, and reducing the temperature of cooling water.

[0045] Furthermore, the heat exchange device 5 also includes: a photovoltaic component 54, which is arranged on the water surface of the sub-reservoir and is used to supply power to the cooling water pump 53.

[0046] Specifically, in the embodiment of the utility model, a photovoltaic module 54 is arranged on the water surface of the sub-reservoir. The photovoltaic module 54 can not only supply power to the cooling water pump 53 or the direct air cooling device 1, but also block the sunlight to reduce the temperature of the cooling water in the sub-reservoir.

[0047] Furthermore, the peak cooling system of the thermal power plant also includes: a cooling water tank 6, which is arranged between the cooling water outlets of the surface condensers 21 of the multiple condensation systems and the cooling water inlet of the mechanical ventilation tower 3, and is used to store the cooling water output by the surface condensers 21 of the multiple condensation systems.

[0048] Specifically, in the embodiment of the utility model, a cooling water tank 6 is arranged between the cooling water outlet of the surface condensers 21 of the multiple condensation systems and the cooling water inlet of the mechanical ventilation tower 3. After the heated cooling water flows out from the cooling water outlets of the multiple surface condensers 21, it is collected in the cooling water tank 6 and then transported by the cooling water pump 8 to the mechanical ventilation tower 3 for cooling.

[0049] Furthermore, the peak cooling system of the thermal power plant also includes: a cooling water return tank 7, which is arranged between the cooling water outlet of the mechanical ventilation tower 3 and the cooling water inlet and outlet of the surface condensers 21 of multiple condensation systems, and is used to store the cooling water output by the mechanical ventilation tower 3.

[0050] Specifically, in the embodiment of the utility model, a cooling water return tank 7 is arranged between the cooling water outlet of the mechanical ventilation tower 3 and the cooling water inlet and outlet of the surface condenser 21 of the multiple condensation systems. The cooled cooling water flows out from the cooling water outlet of the mechanical ventilation tower 3 and is collected in the cooling water return tank 7, and then transported back to the surface condenser 21 by the return pump 9.

[0051] A second aspect of the utility model provides a thermal power plant, comprising the thermal power plant peak cooling system described above.

[0052] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. 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.

[0053] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

[0054] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A peak cooling system for a thermal power plant, characterized in that: The peak cooling system of the thermal power plant comprises: A plurality of condensation systems correspondingly connected to the steam turbines, each condensation system comprising: a steam turbine exhaust inlet, a condensate outlet, and a direct air cooling device (1) and a surface condensation device (2) connected in parallel between the steam turbine exhaust inlet and the condensate outlet; The direct air cooling device (1) is used to use air to cool the exhaust steam input from the corresponding steam turbine to form condensed water, and output the condensed water to the condensed water output port; The surface condensing device (2) is used to cool the exhaust steam input from the corresponding steam turbine using cooling water flowing in the surface condensing device (2) to form condensed water, and output the condensed water to a condensed water output port; The mechanical ventilation tower (3) is connected to the surface condensing devices (2) of the multiple condensing systems and is used to cool the cooling water flowing in the surface condensing devices (2) and circulate the cooled cooling water back to the surface condensing devices (2) of the multiple condensing systems.

2. The peak cooling system of a thermal power plant according to claim 1, characterized in that: The direct air cooling device (1) comprises: a direct air cooling island (11) and a first condensate pump (12) connected in series in sequence; the direct air cooling island (11) is used to use air to cool the exhaust steam input from the corresponding steam turbine to form condensate; the first condensate pump (12) is used to output the condensate formed by the direct air cooling island (11) to a condensate output port; The surface condensing device (2) comprises: a surface condenser (21) and a second condensate pump (22) connected in series in sequence; the surface condenser (21) is used to cool the exhaust steam input from the corresponding steam turbine using cooling water flowing in the surface condenser (21) to form condensate; the second condensate pump (22) is used to output the condensate formed by the surface condenser (21) to a condensate output port; The mechanical ventilation tower (3) is connected to the surface condensers (21) of the multiple condensation systems and is used to cool the cooling water flowing in the surface condensers (21) and circulate the cooled cooling water back to the surface condensers (21) of the multiple condensation systems.

3. The peak cooling system of a thermal power plant according to claim 2, characterized in that: Each condensation system further comprises: a cooling control valve (4), which is arranged on the connecting pipeline between the turbine exhaust steam input port and the surface condenser (21) and is used to control the flow rate of the turbine exhaust steam input to the surface condenser (21).

4. The peak cooling system of a thermal power plant according to claim 2, characterized in that: The thermal power plant peak cooling system also includes: The heat exchange device (5) is arranged on the connecting pipeline between the cooling water outlet of the mechanical ventilation tower (3) and the cooling water inlet of the surface condenser (21), and is used for secondary cooling of the cooling water output from the mechanical ventilation tower (3).

5. The peak cooling system of a thermal power plant according to claim 4, characterized in that: The heat exchange device (5) comprises: A water reservoir (51) for storing cooling water; The heat exchanger (52) comprises a cooling water pipe and a cooling water pipe, wherein the cooling water pipe is used to transport the cooling water outputted by the mechanical ventilation tower (3), and the cooling water pipe is used to transport the cooling water stored in the water reservoir (51), and the cooling water in the cooling water pipe can exchange heat with the cooling water in the cooling water pipe to cool the cooling water in the cooling water pipe; A cooling water pump (53) is arranged on the connecting pipeline between the water reservoir (51) and the water inlet of the cooling water pipe, and is used to control the flow rate of cooling water in the cooling water pipe.

6. The peak cooling system of a thermal power plant according to claim 5, characterized in that: The water reservoir (51) comprises: a plurality of sub-water reservoirs, which are sequentially connected in series between the water outlet of the cooling water pipe and the cooling water pump (53) through pipelines.

7. The peak cooling system of a thermal power plant according to claim 6, characterized in that: The heat exchange device (5) further comprises: a photovoltaic assembly (54), arranged on the water surface of the sub-reservoir and used to supply power to the cooling water pump (53).

8. The peak cooling system of a thermal power plant according to claim 2, characterized in that: The thermal power plant peak cooling system also includes: A cooling water tank (6) is arranged between cooling water outlets of the surface condensers (21) of the multiple condensation systems and a cooling water inlet of the mechanical ventilation tower (3), and is used to store cooling water output by the surface condensers (21) of the multiple condensation systems.

9. The peak cooling system of a thermal power plant according to claim 2, characterized in that: The thermal power plant peak cooling system also includes: A cooling water return tank (7) is arranged between the cooling water outlet of the mechanical ventilation tower (3) and the cooling water inlet and outlet of the surface condensers (21) of the plurality of condensation systems, and is used to store the cooling water output by the mechanical ventilation tower (3).

10. A thermal power plant, comprising the thermal power plant peak cooling system according to any one of claims 1 to 9.

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