A peak cooling system for primary loop water pipeline water balance using day and night temperature difference

Abstract

A kind of main circulating water pipeline water balance's utilization diurnal temperature difference peak cooling system, including main cooling system, peak cooling system, hot water valve, hot water storage tank, hot water supply device, cold water valve, cold water storage tank, cold water replenishing device.Hot water storage tank import can be isolated with the main cooling system circulating water hot water pipe through hot water valve;Hot water storage tank export can be isolated with peak cooling system through hot water supply device;Cold water storage tank import can be isolated with peak cooling system through cold water valve;Cold water storage tank export can be isolated with circulating water cold water pipe through cold water replenishing device.Utilize diurnal temperature difference to realize peak cooling system cold storage, peak cooling system is stored when ambient temperature is low, release when temperature is higher, can effectively improve the situation that condenser inlet water temperature is too high in summer high temperature, with guarantee main circulating water pipeline water balance, cold storage flexible use, make full use of diurnal temperature difference to reduce cooling tower thermal load when high temperature in daytime, further reduce the advantages of condenser inlet water temperature.

Description

Technical Field

[0001] This invention relates to cold storage technology for thermal circulation systems, specifically to a peak cooling system that utilizes diurnal temperature differences for cold storage. Background Technology

[0002] Cooling towers are indispensable equipment in the cold-end system of generator sets, and their heat exchange performance directly affects the operating efficiency of the entire generator set. In summer, high temperatures cause low cooling efficiency of the cooling tower, leading to increased condenser inlet water temperature. Currently, this problem is often addressed by installing peak cooling systems and adding energy storage devices. Chinese patent application No. 201910523582.4 discloses a cooling system with energy storage and its regulation method. This method utilizes the better cooling conditions at night to maximize the flow rate of the medium pump, fully leveraging the system's cooling capacity margin under environmental conditions to cool the heat medium. When the temperature at the low-temperature end of the heat dissipation system is too low, the flow rate of the medium pump is gradually increased to utilize the medium stored in the medium storage tank to heat the heat dissipation system. This patent collects the cooled medium through the cooling medium system, first sending it to the medium storage tank, then returning it to the heat user via a cold medium pipeline, and using the medium pump to regulate the flow rate to meet user requirements. For the cold-end circulation system of a thermal power plant, using a medium pump to regulate the flow rate is equivalent to changing the cooling ratio. The cold or heat energy stored in the medium storage tank still circulates within the system, failing to achieve true cold storage, and the stored cold energy cannot be used during the hottest periods. Furthermore, in actual power plant operation, circulating water pumps often operate at full capacity and high speed in summer, while the cooling water system operates at constant pressure, making it difficult to increase the flow rate of the circulating water system. Therefore, it is necessary to propose a peak-load cooling system that does not alter the constant pressure operation of the cooling water system, does not rely on regulating the circulating water flow rate, and allows for flexible use of the cold storage and circulating water system, in order to improve the insufficient unit output caused by rising ambient temperatures.

[0003] Chinese patent application number 202122602102.9 discloses a cold water supply system using a cooling tower as a cold source, comprising a cold storage unit, a cooling circuit, and a heat exchanger. The cold storage unit and the cooling circuit are respectively connected to the heat exchanger. The cold storage unit includes a cooling tower cold supply circuit and a cooling tower cold storage circuit, and the cooling tower cold supply circuit and the cooling tower cold storage circuit are connected. This patent only provides two sources of cooling capacity: direct cooling from the cooling tower or cold storage and release, and these two cooling methods cannot operate simultaneously. In contrast, this invention patent proposes a peak cooling system utilizing diurnal temperature differences to balance the main circulating water pipeline. This system can achieve combined operation of the main cooling system and the peak cooling system by utilizing the main cooling system, a cold water storage tank, a cold water makeup device, a hot water storage tank, and a hot water supply device. Furthermore, in contrast to the cooling mode of the patent "A Cold Storage Type Cold Water Supply System Using a Cooling Tower as a Cold Source," the cooling side loop consists of a cold storage cooling tower, a cold storage tank, a cooling water pump, and a heat exchanger. The cold water released from the cold storage tank absorbs heat in the heat exchanger, is cooled by the cold storage cooling tower, and finally returns to the cold storage tank. Since the cold water in the cold storage tank is cold water stored during the night, its temperature is relatively lower than the water temperature when it re-enters the tank via the cooling mode. Therefore, during the cooling mode operation, water of different temperatures mixes in the cold storage tank, causing the water temperature in the tank to continuously rise and thus affecting its cooling effect. In contrast, the peak cooling system utilizing the diurnal temperature difference for water balance in the main circulating water pipeline proposed in this invention operates during the daytime (when the ambient temperature is higher). During this time, the temperature of the cold water in its cold water storage tank is not affected by the circulation, ensuring the cooling efficiency of both the main cooling system and the peak cooling system. Summary of the Invention

[0004] This patent proposes a peak cooling system that utilizes diurnal temperature variation to maintain water balance in the main circulating water pipeline. This system stores cold air during the night when ambient temperatures are low and releases it during the day when temperatures are higher, effectively mitigating the problem of excessively high condenser inlet water temperatures in summer. This peak cooling system, which utilizes diurnal temperature variation to maintain water balance in the main circulating water pipeline, allows for flexible use of stored cold air, fully utilizes diurnal temperature variation to reduce the cooling tower's heat load during high daytime temperatures, and further lowers the condenser inlet water temperature.

[0005] A peak cooling system utilizing diurnal temperature variation for main circulating water pipeline water balance includes a main cooling system, a peak cooling system, hot water valves, a hot water storage tank, a hot water supply device, a cold water valve, a cold water storage tank, and a cold water makeup device. Its features include: the main cooling system comprising circulating hot water pipes, circulating water valves, a main cooling tower, circulating cold water pipes, and a makeup water station; the inlet of the hot water storage tank is connected to the circulating hot water pipes of the main cooling system via hot water valves, and can be isolated from the circulating hot water pipes of the main cooling system via hot water valves; the outlet of the hot water storage tank is connected to the peak cooling system via a hot water supply device, and can be isolated from the peak cooling system via a hot water supply device; the inlet of the cold water storage tank is connected to the peak cooling system via a cold water valve, and can be isolated from the peak cooling system via a cold water valve; the outlet of the cold water storage tank is connected to the makeup water station via a cold water makeup device, and can be isolated from the makeup water station via a cold water makeup device.

[0006] The hot water storage tank is used to store a portion of the hot water from the circulating hot water pipe when the ambient temperature is high. The hot water storage tank can be installed above ground or underground. The hot water storage tank should be insulated. The inlet flow rate of the hot water storage tank is Q. g Q g ≥0 t / h and Q g <D, where D is the unit's circulating water flow rate and A is the hot water storage tank's water volume. g A g ≥0 t.

[0007] The peak cooling system can be a wet cooling tower, an indirect air-cooled tower, a closed cooling tower, or a combined wet and dry cooling tower, used to cool hot water in a hot water storage tank into cold water when the ambient temperature is low.

[0008] The cold water storage tank is used to store the cold water generated by the peak cooling system when the ambient temperature is low; the cold water storage tank can be installed above ground or underground, and should be insulated; the outlet flow rate of the cold water storage tank is Q. d Q d ≥0 tons / hour, and Q d = Q g Cold water storage tank storage capacity A d A d ≥0 tons.

[0009] The main cooling tower can be a natural draft wet cooling tower, an indirect air cooling tower, a closed cooling tower, or a combined wet and dry cooling tower.

[0010] The hot water supply device consists of M parallel water pumps, where M ≥ 1 and M is an integer; the cold water supply device consists of N parallel water pumps, where N ≥ 1 and N is an integer.

[0011] The water replenishment station of the main cooling system is a wet cooling tower water collection pool when the main cooling system is a wet cooling system; and an indirect air cooling tower expansion tank when the main cooling system is an indirect air cooling system.

[0012] The circulating hot water pipe sends the circulating hot water through the circulating water valve to the main cooling tower for cooling into cold water; the circulating cold water pipe sends out the cold water obtained from the cooling tower.

[0013] The hot water valve can be a regulating valve, butterfly valve, gate valve, or stop valve; the cold water valve can be a regulating valve, butterfly valve, gate valve, or stop valve; the circulating water valve can be a butterfly valve, gate valve, or stop valve.

[0014] The peak cooling system is used as follows: 1) Initial nighttime use (when the ambient temperature is low): Hot water valve and cold water valve are open, all valves and pumps of the hot water supply device are open, all valves and pumps of the cold water supply device are closed, and the circulating water valve is open. Hot circulating water is drawn from the hot water pipe and enters the peak cooling system through the hot water valve, hot water storage tank, and hot water supply device. The cooled circulating water is stored in the cold water storage tank. The operation of the peak cooling system at night (when the ambient temperature is low) does not affect the normal operation of the main cooling tower; 2) Daytime use (when the ambient temperature is high): Hot water valve is open, all valves and pumps of the hot water supply device are closed, the cold water valve is closed, all valves and pumps of the cold water supply device are open, and the circulating water valve is open. During the daytime (when the ambient temperature is high), the output of the main cooling tower is insufficient. At this time, hot circulating water is drawn from the hot water pipe and stored in the hot water storage tank through the hot water valve. The inlet flow rate of the hot water storage tank is Q. g The total amount is A g The cold circulating water, cooled overnight (when the ambient temperature is low) and stored in the cold water storage tank, is mixed with the cold water supply device and sent to the makeup water station. The outlet flow rate of the cold water storage tank is Q. d Q d = Q g The total amount is A d 3) Nighttime (when the ambient temperature is low): Hot water valve is closed, all valves and pumps of the cold water supply device are closed, all valves and pumps of the hot water supply device are opened, and the cold water valve and circulating water valve are opened. The hot circulating water stored in the hot water storage tank during the day enters the peak cooling system for cooling. The cooled circulating water is stored in the cold water storage tank for use during the day (when the ambient temperature is high). The operation of the peak cooling system at night (when the ambient temperature is low) does not affect the normal operation of the main cooling tower. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a peak cooling system utilizing day-night temperature differences, according to one embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of a peak cooling system utilizing the day-night temperature difference, which is another embodiment of the present invention.

[0017] In the diagram: 1—Hot water storage tank, 2—Peak cooling system, 3—Cold water storage tank, 4—Main cooling tower, 5—Hot water valve, 6—Hot water supply device, 7—Cold water valve, 8—Cold water supply device, 9—Circulating water valve, 10—Circulating water hot water pipe, 11—Circulating water cold water pipe, 12—Expansion tank in the indirect cooling tower system, 13—Water collection pool in the wet cooling tower system, 14—Hot water storage tank inlet, 15—Hot water storage tank outlet, 16—Cold water storage tank inlet, 17—Cold water storage tank outlet. Implementation

[0018] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0019] Example 1 is a peak cooling system that utilizes the diurnal temperature difference and maintains the water balance of the main circulating water pipeline using a natural ventilation wet cooling tower as the peak cooling system.

[0020] As attached Figure 1 As shown, a peak cooling system utilizing diurnal temperature variation for main circulating water pipeline water balance includes a hot water storage tank 1, a peak cooling system 2, a cold water storage tank 3, a main cooling tower 4, a hot water valve 5, a hot water supply device 6, a cold water valve 7, a cold water supply device 8, a circulating water valve 9, a circulating water hot water pipe 10, and a circulating water cold water pipe 11. The peak cooling system 2 is a natural draft wet cooling tower, and the main cooling tower 4 is a natural draft indirect air-cooled tower. The hot water storage tank inlet 14 is connected to the circulating hot water pipe 10 via hot water valve 5. The hot water storage tank outlet 15 is connected to the peak cooling 2 system via hot water supply device 6. The hot water supply device 6 is equipped with three parallel water pumps, with valves installed before and after the water pumps. The peak cooling system 2 is connected to the cold water storage tank 3 via cold water valve 7. The low-temperature water in the cold water storage tank 3 enters the circulating cold water pipe 11 via cold water supply device 8. The low-temperature water replenishment device 8 is equipped with three parallel water pumps, with valves installed before and after the water pumps. The main cooling tower 4 has a circulating water valve 9 on its inlet pipe.

[0021] The average temperature during the daytime high-temperature period is 30℃, and the condenser outlet water temperature is 55℃; the average temperature during the nighttime low-temperature period is 20℃, and the condenser outlet water temperature is 45℃; the temperature difference between the condenser inlet and outlet water is 10℃; and the unit circulating water flow rate is 61560t / h.

[0022] For initial nighttime use (when ambient temperature is low): hot water valve 5 and cold water valve 7 are open; all valves and pumps of hot water supply device 6 are open; all valves and pumps of cold water supply device 8 are closed; and circulating water valve 9 is open. Hot circulating water is drawn from circulating water hot water pipe 10 and flows through hot water valve 5, hot water storage tank 1, and hot water supply device 6 into peak cooling system 2. The flow rate at hot water storage tank inlet 14 is 6156 t / h. After 4 hours of extraction, peak cooling system 2 cools a total of 24624 t of water. The cooled circulating water is stored in cold water storage tank 3. The remaining hot circulating water enters the main cooling tower 4 at a rate of 55404 t / h for cooling and is then discharged through circulating water cold water pipe 11. During the nighttime low-temperature period, the average air temperature is 20℃, the condenser outlet water temperature is 45℃, and the peak cooling system outlet water temperature is 35℃.

[0023] During daytime operation (when ambient temperature is high): Hot water valve 5 is open, all valves and pumps of hot water supply device 6 are closed, cold water valve 7 is closed, all valves and pumps of cold water supply device 8 are open, and circulating water valve 9 is open. During peak daytime temperatures, when unit output is insufficient, hot circulating water is drawn from circulating water hot water pipe 10 and stored in hot water storage tank 1 via hot water valve 5. The flow rate at the inlet 14 of the hot water storage tank is 6156 t / h. After continuous drawing for 4 hours, the total flow rate is 24624 t / h. The remaining hot circulating water enters the main cooling tower 4 at a rate of 55404 t / h for cooling. During peak daytime temperatures, the average air temperature is 30℃, the condenser outlet water temperature is 55℃, and the main cooling tower 4 outlet water temperature is 45℃. The amount of hot circulating water entering the main cooling tower 4 is reduced, resulting in a lower heat load. After cooling, the 55404 t / h hot circulating water can be cooled by approximately 6156 × 10 / 55404 × 60% = 0.7℃ compared to the original flow rate. During this process, the actual outlet water temperature of the main cooling tower 4 is 44.3℃. The main cooling tower 4 is a natural draft indirect air-cooled tower. The expansion tank 12 in the indirect cooling tower system is connected to the circulating water cooling pipe 11. In this embodiment, the cold circulating water stored in the cold water storage tank 3 after cooling at night is injected into the expansion tank 12 in the indirect cooling tower system through the cold water supply device 8 and then sent out along the circulating water cooling pipe 11. The cold water discharge flow rate at the outlet 17 of the cold water storage tank is 6156 t / h, with a total volume of 24624 t and a water temperature of 35℃. This process can further reduce the water temperature by approximately 6156 × 10 / 61560 = 1℃.

[0024] Nighttime (when ambient temperature is low): Hot water valve 5 and cold water valve 7 are open; all valves and pumps of hot water supply device 6 are open; all valves and pumps of cold water supply device 8 are closed; and circulating water valve 9 is open. Hot circulating water stored in hot water storage tank 1 during the day enters the peak cooling system 2 for cooling. The flow rate at outlet 15 of the hot water storage tank is 6156 t / h. After 4 hours of pumping, the peak cooling system 2 cools a total of 24624 t of water. The cooled circulating water is stored in cold water storage tank 3 for use during the daytime high temperatures. The operation of the peak cooling system 2 at night does not affect the normal operation of the main cooling tower 4. The remaining hot circulating water enters the main cooling tower 4 at a rate of 55404 t / h for cooling and is then sent out through circulating water cooling pipe 11. During the nighttime low-temperature period, the average air temperature is 20℃, the condenser outlet water temperature is 45℃, and the peak cooling system outlet water temperature is 35℃.

[0025] Peak cooling system 2 operates to store cold air at night when the ambient temperature is low and releases it during the day when the temperature is higher, thus circulating in a cycle to effectively improve the insufficient output of the unit caused by the rise in ambient temperature.

[0026] Example 2 is a peak cooling system that utilizes the diurnal temperature difference to achieve water balance in the main circulating water pipeline of a natural ventilation indirect air-cooled tower as a peak cooling system.

[0027] As attached Figure 2 As shown, a peak cooling system utilizing diurnal temperature variation for main circulating water pipeline water balance includes a hot water storage tank 1, a peak cooling system 2, a cold water storage tank 3, a main cooling tower 4, a hot water valve 5, a hot water supply device 6, a cold water valve 7, a cold water supply device 8, a circulating water valve 9, a circulating water hot water pipe 10, and a circulating water cold water pipe 11. The peak cooling system 2 is a natural draft indirect air-cooled tower, and the main cooling tower 4 is a natural draft wet cooling tower. The hot water storage tank inlet 14 is connected to the circulating hot water pipe 10 via hot water valve 5. The hot water storage tank outlet 15 is connected to the peak cooling 2 system via hot water supply device 6. The hot water supply device 6 is equipped with two parallel water pumps, with valves installed before and after the water pumps. The peak cooling system 2 is connected to the cold water storage tank 3 via cold water valve 7. The low-temperature water in the cold water storage tank 3 enters the circulating cold water pipe 11 via cold water supply device 8. The low-temperature water replenishment device 8 is equipped with two parallel water pumps, with valves installed before and after the water pumps. The main cooling tower 4 has a circulating water valve 9 on its inlet pipe.

[0028] The average temperature during the daytime high-temperature period is 32℃, and the condenser outlet water temperature is 55℃; the average temperature during the nighttime low-temperature period is 21℃, and the condenser outlet water temperature is 44℃; the temperature difference between the condenser inlet and outlet water is 11℃; and the unit circulating water flow rate is 82770t / h.

[0029] For the first nighttime use (when the ambient temperature is low): hot water valve 5 and cold water valve 7 are opened; all valves and pumps of the hot water supply device 6 are opened; all valves and pumps of the cold water supply device 8 are closed; and circulating water valve 9 is opened. Hot circulating water is drawn from the hot water pipe 10 and flows through hot water valve 5, hot water storage tank 1, and hot water supply device 6 into the peak cooling system 2. The flow rate at the inlet 14 of the hot water storage tank is 8277 t / h. After 6 hours of extraction, the peak cooling system 2 cools a total of 49662 t of water. The cooled circulating water is stored in the cold water storage tank 3, and the remaining hot circulating water enters the main cooling tower 4 at a rate of 74493 t / h for cooling and is then sent out through the circulating water cold water pipe 11. During the low-temperature period at night, the average air temperature is 21℃, the condenser outlet water temperature is 44℃, and the peak cooling system outlet water temperature is 33℃.

[0030] During daytime operation (when ambient temperature is high): hot water valve 5 is open, all valves and pumps of hot water supply device 6 are closed, cold water valve 7 is closed, all valves and pumps of cold water supply device 8 are open, and circulating water valve 9 is open. During periods of high daytime temperature, when unit output is insufficient, hot circulating water is drawn from circulating water hot water pipe 10 and stored in hot water storage tank 1 via hot water valve 5. The flow rate at the inlet 14 of the hot water storage tank is 8277 t / h. After continuous drawing for 6 hours, the total flow rate is 49662 t. The remaining hot circulating water enters the main cooling tower 4 at a rate of 74493 t / h for cooling. The average daytime temperature is 32℃, the condenser outlet water temperature is 55℃, and the main cooling tower 4 outlet water temperature is 44℃. The amount of hot circulating water entering the main cooling tower 4 is reduced, resulting in a lower heat load. After cooling, the 74493 t / h hot circulating water can be cooled by approximately 8277 × 11 / 74493 × 60% = 0.73℃ compared to the original flow rate. During this process, the actual outlet water temperature of the main cooling tower 4 is 43.27℃. The main cooling tower 4 is a natural draft wet cooling tower. In this embodiment, the cold circulating water stored in the cold water storage tank 3 after cooling overnight is injected into the water collection pool 13 in the wet cooling tower system through the cold water supply device 8 and then sent out along the circulating water cold water pipe 11. The cold water discharge flow rate at the outlet 17 of the cold water storage tank is 8277 t / h, and it is continuously discharged for 6 hours, with a total volume of 49662 t and a water temperature of 33℃. This process can further reduce the water temperature by approximately 8277 × 11 / 82770 = 1.1℃.

[0031] Nighttime (when ambient temperature is low): Hot water valve 5 and cold water valve 7 are open; all valves and pumps of hot water supply device 6 are open; all valves and pumps of cold water supply device 8 are closed; and circulating water valve 9 is open. Hot circulating water stored in hot water storage tank 1 during the day enters the peak cooling system 2 for cooling. The flow rate at outlet 15 of the hot water storage tank is 8277 t / h. After 6 hours of extraction, the peak cooling system 2 cools a total of 49662 t of water. The cooled circulating water is stored in cold water storage tank 3 for use during the daytime high temperatures. The operation of the peak cooling system 2 at night does not affect the normal operation of the main cooling tower 4. The remaining hot circulating water enters the main cooling tower 4 at a rate of 74493 t / h for cooling. During the nighttime low-temperature period, the average air temperature is 21℃, the condenser outlet water temperature is 44℃, and the peak cooling system outlet water temperature is 33℃. The peak cooling system 2 operates to store cold water during the nighttime low ambient temperature and releases it during the daytime high temperature. Each storage tank is independent of the main cooling tower system, achieving flexible use of low-temperature water for nighttime cooling.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention, and no reference numerals in the claims should be regarded as limiting the scope of the claims.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A peak cooling system utilizing diurnal temperature difference for water balance in the main circulating water pipeline, comprising a main cooling system, a peak cooling system, hot water valves, a hot water storage tank, a hot water supply device, cold water valves, a cold water storage tank, and a cold water makeup device; wherein the main cooling system comprises circulating hot water pipes, circulating water valves, a main cooling tower, circulating cold water pipes, and a makeup water station; Its features are: The inlet of the hot water storage tank is connected to the circulating hot water pipe via the hot water valve, and the outlet of the hot water storage tank is connected to the inlet of the peak cooling system via the hot water supply device; the inlet of the cold water storage tank is connected to the outlet of the peak cooling system via the cold water valve, and the outlet of the cold water storage tank is connected to the water replenishment station via the cold water replenishment device. The hot water storage tank and the cold water storage tank are two independent and physically isolated tanks; The system is configured to operate in the following mode to utilize the diurnal temperature difference while maintaining dynamic balance of water volume in the main circulating water pipeline: Daytime operation mode: Open the hot water valve and cold water replenishment device, and close the hot water supply device and cold water valve; hot water with a flow rate of Qg is diverted from the circulating hot water pipe and stored in the hot water storage tank through the hot water valve; at the same time, cold water with a flow rate of Qd is injected from the cold water storage tank into the replenishment station through the cold water replenishment device, where Qd = Qg; Nighttime operation mode: Turn on the hot water supply device and cold water valve, and turn off the hot water valve and cold water supply device; pump the hot water in the hot water storage tank to the peak cooling system for cooling via the hot water supply device, and store the resulting cold water in the cold water storage tank via the cold water valve.

2. The system according to claim 1, characterized in that: The hot water storage tank is used to store hot water from the circulating hot water pipe when the ambient temperature is high. The hot water storage tank can be installed on the ground or underground and is insulated. The inlet flow rate of the hot water storage tank is Qg, where Qg ≥ 0 tons / hour and Qg < D, where D is the unit's circulating water flow rate, and the water storage capacity of the hot water storage tank is Ag, where Ag ≥ 0 tons.

3. The system according to claim 1, characterized in that: The peak cooling system is a wet cooling tower, an indirect air-cooled tower, a closed cooling tower, or a combined wet and dry cooling tower.

4. The system according to claim 1, characterized in that: The cold water storage tank is used to store the cold water generated by the peak cooling system when the ambient temperature is low; the cold water storage tank can be installed above ground or underground and is insulated; the outlet flow rate of the cold water storage tank is Qd, Qd≥0 tons / hour, and the water storage capacity of the cold water storage tank is Ad, Ad≥0 tons.

5. The system according to claim 1, characterized in that: The main cooling tower is a natural draft wet cooling tower, an indirect air cooling tower, a closed cooling tower, or a combined wet and dry cooling tower.

6. The system according to claim 1, characterized in that: The hot water supply device consists of M parallel water pumps, where M ≥ 1 and is an integer; the cold water supply device consists of N parallel water pumps, where N ≥ 1 and is an integer.

7. The system according to claim 1, characterized in that: When the main cooling system is a wet cooling system, the makeup water station is a wet cooling tower water collection pool; when the main cooling system is an indirect air cooling system, the makeup water station is an indirect cooling tower expansion tank.

8. The system according to claim 1, characterized in that: The circulating hot water pipe delivers circulating hot water to the main cooling tower for cooling via the circulating water valve; the circulating cold water pipe delivers the cold water obtained from the cooling of the main cooling tower.

9. The system according to claim 1, characterized in that: The hot water valve and cold water valve are regulating valves, butterfly valves, gate valves or stop valves; the circulating water valve is a butterfly valve, gate valve or stop valve.

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