A direct air-cooling peak cooling system with double cold storage and heat storage

Abstract

The direct air cooling peak cooling system with double cold storage and heat storage comprises a direct air cooling energy storage system and a peak cooling energy storage system; the direct air cooling energy storage system comprises a direct air cooling system, a cold storage condensate tank, a heat storage condensate tank and a direct air cooling energy storage circulating unit; the peak cooling energy storage system comprises a peak cooling system, a cold storage circulating water tank, a heat storage circulating water tank and a peak cooling energy storage circulating unit; the direct air cooling energy storage system and the peak cooling energy storage system are connected through the peak cooling system; when the air temperature is high, heat storage and cold release are carried out, when the air temperature is low, cold storage and heat release are carried out, and the peak cooling system maintains hydraulic balance during the energy storage and energy release process; the thermal load of the direct air cooling system and the steam temperature in the exhaust device are reduced at high temperature, the cooling efficiency and the unit vacuum are improved; during the low temperature period, the heat storage quantity enters the condensate tank or the condensate pipeline, the condensate temperature is improved, the supercooling degree and the oxygen content are reduced, the condensate return water heat absorption quantity is reduced, and the unit efficiency is improved.

Description

Technical Field

[0001] This invention relates to cold storage technology for thermal circulation systems, specifically to a direct air-cooled peak cooling system with dual cold and heat storage. Background Technology

[0002] Direct air-cooled systems have rapidly developed in water-scarce regions of northern my country due to their advantages, such as not requiring intermediate cooling media like cooling water, fewer equipment, simpler systems, and smaller footprint. However, in direct air-cooled systems, the steam discharged from the low-pressure cylinder of the turbine needs to be condensed into water and then recycled back to the boiler. As the direct air-cooled system has been in use for a longer period, its air-cooled condenser has become heavily scaled, resulting in low cooling efficiency during high summer temperatures and increased back pressure during unit operation. This contradicts the energy-saving and low-carbon development approach pursued in thermal power generation. Installing a peak cooling system on the direct air-cooled system is a common method to reduce back pressure, but it overlooks the fact that the cooling efficiency of the peak cooling system is easily affected by environmental meteorological conditions. In recent years, cold and heat storage in thermal power generation cooling systems has become a hot topic. The starting point of this patent is to explore how to link cold and heat storage with direct air-cooled systems and peak cooling systems to ensure stable heat exchange efficiency, flexible energy storage utilization, and significant reduction in unit back pressure. Summary of the Invention

[0003] A dual-energy storage and thermal storage direct air-cooled peak cooling system includes a direct air-cooled energy storage system and a peak cooling energy storage system. The direct air-cooled energy storage system includes a direct air-cooling system, a cold storage condensate tank, a thermal storage condensate tank, and a direct air-cooled energy storage circulation unit. The peak cooling energy storage system includes a peak cooling system, a cold storage circulating water tank, a thermal storage circulating water tank, and a peak cooling energy storage circulation unit. The direct air-cooled energy storage system and the peak cooling energy storage system are connected through the peak cooling system. This dual-energy storage and thermal storage direct air-cooled peak cooling system can utilize the diurnal temperature range to store cold energy in both the direct air-cooled energy storage system and the peak cooling energy storage system when the ambient temperature is low, and release cold energy when the ambient temperature is high. Simultaneously, when the ambient temperature is high... The system utilizes both direct air-cooled energy storage and peak cooling energy storage systems to store heat. Heat is released when the ambient temperature is low. During energy storage and release, the peak cooling system maintains hydraulic balance, and the levels of energy storage and release are adjustable for flexible use, ensuring a relatively constant back pressure for the unit under varying ambient temperatures. During high-temperature periods, this not only reduces the amount of exhaust steam entering the direct air-cooled system and lowers its heat load, but also utilizes the low-temperature condensate stored overnight to directly reduce the steam temperature within the exhaust system, effectively improving cooling efficiency and unit vacuum during high-temperature periods. During low-temperature periods, the stored heat is placed in the condensate tank or condensate pipeline, increasing the condensate temperature, reducing its subcooling and oxygen content, and effectively reducing the heat absorption of the condensate return water, thereby improving unit efficiency.

[0004] A dual-energy storage and thermal storage direct air-cooled peak cooling system includes a direct air-cooled energy storage system and a peak cooling energy storage system. The direct air-cooled energy storage system comprises a direct air-cooling system, a cold storage condensate tank, a thermal storage condensate tank, and a direct air-cooled energy storage circulation unit. The peak cooling energy storage system comprises a peak cooling system, a cold storage circulating water tank, a thermal storage circulating water tank, and a peak cooling energy storage circulation unit. The direct air-cooled energy storage system and the peak cooling energy storage system are connected through the peak cooling system, coordinating cooling release when the ambient temperature is high and coordinating heat release when the ambient temperature is low, thereby improving the efficiency of the direct air-cooling system.

[0005] The direct air-cooling system includes a steam exhaust device, a condensate pump group, a condensate pipe, a main steam exhaust pipe, an air-cooled radiator, a condensate tank, and a condensate pipe. The steam exhaust device transports high-temperature steam to the air-cooled radiator through the main steam exhaust pipe. After the steam is cooled and condensed in the air-cooled radiator, it enters the condensate tank and is then discharged along the condensate pipe. The condensate in the steam exhaust device is then sent to the condensate tank by the condensate pump group through the condensate pipe.

[0006] The condensate storage tank is used to store low-temperature condensate generated by the cooling steam of the peak cooling tower when the ambient temperature is low. The condensate storage tank can be installed on the ground or underground, and the condensate storage tank is insulated. The heat storage tank is used to store high-temperature condensate generated by the cooling steam of the peak cooling tower when the ambient temperature is high. The heat storage tank can be installed on the ground or underground, and the heat storage tank is insulated.

[0007] The direct air-cooled energy storage cycle unit includes an exhaust valve, a secondary exhaust pipe, a condensate return pipe, a low-temperature condensate valve, a low-temperature condensate pump unit, a high-temperature condensate valve (first), a high-temperature condensate pump unit, a high-temperature condensate valve (second), a return valve (second), and a return valve (first). The secondary exhaust pipe supplies steam to the peak cooling system. The exhaust valve is installed on the secondary exhaust pipe to cut off or open the secondary exhaust pipe and to regulate the steam volume. The condensate from the steam cooled by the peak cooling system is sent out through the condensate return pipe. One end of the low-temperature condensate valve is connected to the condensate return pipe, and the other end is connected to the condensate storage tank. One end of the low-temperature condensate pump unit is connected to the condensate storage tank, and the other end is connected to the exhaust device. The low-temperature condensate pump unit consists of N parallel pumps, where N≥1 and N is an integer, which can mix the condensate in the condensate storage tank and supply it to the exhaust device.

[0008] The high-temperature condensate valve is connected at one end to the condensate return pipe and at the other end to the thermal condensate tank; the high-temperature condensate valve is connected at one end to the condensate tank and at the other end to the thermal condensate tank; the return valve is connected at one end to the condensate return pipe and at the other end to the condensate pipe; the return valve is connected at one end to the thermal condensate tank and at the other end to the condensate pipe; the high-temperature condensate pump unit is connected at one end to the thermal condensate tank and at the other end to the condensate tank. The high-temperature condensate pump unit is an M-channel parallel pump, where M≥1 and M is an integer, which can mix the condensate in the thermal condensate tank and supply it to the condensate tank.

[0009] The peak cooling system includes a peak cooling tower, a circulating water return pipe, a circulating water pump unit, a circulating water valve, and a circulating water supply pipe. The peak cooling tower cools the circulating water or steam. After participating in heat exchange within the peak cooling tower, the circulating water is sent out by the circulating water pump unit installed on the circulating water return pipe and then enters the circulating water supply pipe through the circulating water valve to supply water to the peak cooling tower, completing one cycle. The circulating water pump unit is a parallel pump with A circuits, where A ≥ 1 and A is an integer.

[0010] The peak cooling tower includes a tower body, a circulating water spray device, and a heat exchange coil. The tower body encloses the circulating water spray device and the heat exchange coil. The circulating water spray device atomizes the circulating water entering the tower along the circulating water supply pipe and sprays it onto the heat exchange coil to exchange heat with the steam in the heat exchange coil. One end of the heat exchange coil is connected to the secondary exhaust pipe and the other end is connected to the condensate return pipe.

[0011] The cold storage circulating water tank is used to store the cold circulating water after the peak cooling tower has cooled down. The cold storage circulating water tank can be installed on the ground or underground. The cold storage circulating water tank is insulated. The heat storage circulating water tank is used to store the hot circulating water after the peak cooling tower has absorbed the heat of the steam. The heat storage circulating water tank can be installed on the ground or underground. The heat storage circulating water tank is insulated.

[0012] The peak cooling energy storage circulation unit includes a cold circulating water valve, a cold circulating water pump unit, a hot circulating water valve, and a hot circulating water pump unit. The cold circulating water valve connects or isolates the circulating water return pipe from the cold circulating water tank. One end of the cold circulating water pump unit is connected to the cold circulating water tank, and the other end is connected to the circulating water supply pipe, which can supply water from the cold circulating water tank to the peak cooling tower. It is a B-path parallel water pump, where B≥1 and B is an integer. The hot circulating water valve connects or isolates the circulating water return pipe from the hot circulating water tank. One end of the hot circulating water pump unit is connected to the hot circulating water tank, and the other end is connected to the circulating water supply pipe, which can supply water from the hot circulating water tank to the peak cooling tower. It is a C-path parallel water pump, where C≥1 and C is an integer.

[0013] The operating modes of the direct air-cooled peak cooling system with dual cold and heat storage are as follows: 1) Low-temperature initial use mode: Steam enters the exhaust device, the exhaust valve is opened, and a portion of the steam enters the air-cooled radiator for cooling through the main exhaust pipe. The condensate after cooling is collected by the condensate tank and sent out through the condensate pipe. A portion of the steam enters the peak cooling tower along the secondary exhaust pipe. At this time, the cold circulating water valve, circulating water valve, cold circulating water pump unit, hot circulating water pump unit, high-temperature condensate valve, and low-temperature condensate pump unit are closed, while the circulating water pump unit, circulating water valve, and low-temperature condensate valve are opened. The peak cooling tower cools the steam, and the condensate generated by cooling enters the cold storage condensate tank along the low-temperature condensate valve. After t hours (t>0), the exhaust valve is closed, the cold circulating water valve is opened, and the circulating water in the peak cooling tower undergoes self-cooling. After cooling, it enters the cold storage circulating water tank along the circulating water return pipe and the cold circulating water valve. At this time, the exhaust device and the main exhaust pipe... 1) The loop consisting of the air-cooled radiator, condensate tank, and condensate pipeline operates normally; 2) High-temperature circulation mode: The hot circulating water pump unit, cold circulating water valve, circulating water valve, low-temperature condensate valve, high-temperature condensate pump unit, and return water valve two are closed. The circulating water valve, cold circulating water pump unit, circulating water pump unit, exhaust valve, and low-temperature condensate pump unit are open. A portion of the steam enters the peak cooling tower through the exhaust valve and secondary exhaust pipeline. The cold circulating water pump unit supplies water to the peak cooling tower to cool the steam in the peak cooling tower. A portion of the steam is cooled along the exhaust device, main exhaust pipeline, and air-cooled radiator pipeline. The cooled condensate enters the condensate tank. The water temperature T1 in the condensate tank is compared with the water temperature T2 in the condensate return pipeline. If T1 > T2, then high-temperature condensate valve two and return water valve one are opened, and high-temperature condensate valve one is closed. A portion of the condensate in the condensate tank is stored in the thermal storage condensate tank. The inlet flow rate of the thermal storage condensate tank is Q. a Q a If T1 > T2, the condensate cooled in the peak cooling tower is discharged through the condensate return pipe and return valve 1. If T1 < T2, high-temperature condensate valve 1 is opened, and high-temperature condensate valve 2 and return valve 1 are closed. The condensate cooled in the peak cooling tower is then stored in the thermal storage condensate tank through the condensate return pipe and high-temperature condensate valve 1. The inlet flow rate of the thermal storage condensate tank is Q. b Q b >0; Simultaneously, the low-temperature condensate pump unit supplies water to the exhaust system to reduce the steam temperature in the exhaust system. At this time, the loop consisting of the exhaust system, main exhaust pipe, air-cooled radiator, condensate tank, and condensate pipe is operating normally, and the condensate flow rate generated in the exhaust system is Q. c Q c = Q a Or Q c = Q bThis portion of condensate enters the condensate tank along the drain pump group and drain pipe, mixes with the condensate generated by the cooling steam of the air-cooled radiator, and is then sent out through the condensate pipe. The hot circulating water that has absorbed the heat of the steam in the peak cooling tower enters the heat storage circulating water tank along the circulating water pump unit, circulating water return pipe, and circulating water valve; 3) Low temperature circulation mode: the exhaust valve, low temperature condensate valve, high temperature condensate pump unit, hot circulating water pump unit, circulating water pump unit, and hot circulating water valve are open, while the cold circulating water valve, circulating water valve, low temperature condensate pump unit, high temperature condensate valve one, cold circulating water pump unit, high temperature condensate valve two, return water valve one, and return water valve two are closed. A portion of the steam enters the air-cooled radiator for cooling through the main exhaust pipe, and the cooled condensate is collected by the condensate tank. A portion of the steam enters the peak cooling tower along the secondary exhaust pipe, and the hot circulating water pump unit supplies water to the peak cooling tower to cool the steam. The condensate generated by cooling is Q d The flow rate enters the condensate storage tank through the low-temperature condensate valve for storage in order to be used in high-temperature circulation mode. d >0; The difference between the saturation temperature corresponding to the unit's exhaust steam pressure and the condensate tank water temperature is called subcooling. When the subcooling is ≥1℃, the high-temperature condensate stored in the thermal storage condensate tank in the high-temperature circulation mode is Q e The flow rate enters the condensate tank along the high-temperature condensate pump unit, mixes with the condensate generated by the air-cooled radiator, and is then sent out through the condensate pipe. e = Q d When the subcooling is <1℃, to prevent vaporization in the condensate tank, the high-temperature condensate pump unit needs to be shut off and the return water valve 2 opened to allow the high-temperature condensate in the heat storage condensate tank to flow at Q. g The flow rate directly enters the condensate pipe and is then discharged. At this time, Q g = Q d After t hours, t > 0, the exhaust valve and hot circulating water valve are closed, and the cold circulating water valve is opened. No more steam enters the peak cooling tower, and the circulating water in the peak cooling tower undergoes self-cooling. The cooled circulating water enters the cold storage circulating water tank through the circulating water return pipe and the cold circulating water valve. At this time, the loop consisting of the exhaust device, the main exhaust pipe, the air-cooled radiator, the condensate tank, and the condensate pipe is operating normally. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a direct air-cooled peak cooling system with dual cold and heat storage, representing one embodiment of the present invention.

[0015] In the diagram: 1—Exhaust steam device, 2—Drain pump set, 3—Air-cooled radiator, 4—Condensate tank, 5—Condensate pipe, 6—Main exhaust steam pipe, 7—Secondary exhaust steam pipe, 8—Peak cooling tower, 9—Cold storage condensate tank, 10—Low-temperature condensate pump unit, 11—Heat storage condensate tank, 12—High-temperature condensate pump unit, 13—Circulating water pump unit, 14—Cold circulating water valve, 15—Cold storage circulating water tank, 16—Cold circulating water pump unit, 17—Heat circulation 18—Water valve, 19—Heat storage circulating water tank, 20—Heat circulating water pump unit, 21—Circulating water valve, 22—Low temperature condensate valve, 23—High temperature condensate valve one, 24—Circulating water supply pipe, 25—Condensate return pipe, 26—Circulating water return pipe, 27—Steam exhaust valve, 28—High temperature condensate valve two, 29—Return water valve one, 30—Drainage pipe, 31—Circulating water spray device, 32—Heat exchange coil. Detailed Implementation

[0016] 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.

[0017] As attached Figure 1 As shown, a direct air-cooled peak cooling system with dual cold and heat storage includes: an exhaust device 1, a condensate pump set 2, an air-cooled radiator 3, a condensate tank 4, a condensate pipe 5, a main exhaust pipe 6, a secondary exhaust pipe 7, a peak cooling tower body 8, a cold storage condensate tank 9, a low-temperature condensate pump unit 10, a heat storage condensate tank 11, a high-temperature condensate pump unit 12, a circulating water pump unit 13, a cold circulating water valve 14, a cold storage circulating water tank 15, and a cold circulating water pump. Unit 16, hot circulating water valve 17, heat storage circulating water tank 18, hot circulating water pump unit 19, 20, circulating water valve, low temperature condensate valve 21, high temperature condensate valve 1 22, circulating water supply pipe 23, condensate return pipe 24, circulating water return pipe 25, steam exhaust valve 26, high temperature condensate valve 27, return water valve 1 28, return water valve 2 29, drain pipe 30, circulating water spray device 31, heat exchange coil 32.

[0018] As attached Figure 1As shown, the exhaust valve 26 is arranged on the secondary exhaust pipe 7; one end of the low-temperature condensate valve 21 is connected to the condensate return pipe 24 via a pipe, and the other end is connected to the condensate storage tank 9 via a pipe; one end of the low-temperature condensate pump unit 10 is connected to the condensate tank 9, and the other end is connected to the exhaust device 1; one end of the high-temperature condensate valve 22 is connected to the condensate return pipe 24 via a pipe, and the other end is connected to the heat storage condensate tank 11 via a pipe; one end of the high-temperature condensate pump unit 12 is connected to the heat storage condensate tank 11, and the other end is connected to... Condensate tank 4 is connected; one end of high-temperature condensate valve 27 is connected to the thermal condensate tank 11 via a pipe, and the other end is connected to the condensate tank 4 via a pipe; one end of return valve 28 is connected to the condensate return pipe 24 via a pipe, and the other end is connected to the condensate pipe 5; one end of return valve 29 is connected to the thermal condensate tank 11 via a pipe, and the other end is connected to the condensate pipe 5; circulating water pump unit 13 is installed on the circulating water return pipe 25; circulating water valve 20 is installed between the circulating water return pipe 25 and the circulating water supply pipe. Between pipes 23; one end of cold circulating water valve 14 is connected to circulating water return pipe 25 and the other end is connected to cold storage circulating water tank 15; one end of cold circulating water pump unit 16 is connected to cold storage circulating water tank 15 and the other end is connected to circulating water supply pipe 23; one end of hot circulating water valve 17 is connected to circulating water return pipe 25 and the other end is connected to heat storage circulating water tank 18; one end of hot circulating water pump unit 19 is connected to heat storage circulating water tank 18 and the other end is connected to circulating water supply pipe 23; circulating water spray is installed inside peak cooling tower 8. The device and heat exchange coil are connected at one end to the secondary exhaust pipe 7 and at the other end to the condensate return pipe 24; the exhaust device 1, the main exhaust pipe 6, the air-cooled radiator 3, the condensate tank 4, and the condensate pipe 5 are connected in sequence; the drain pump group 2 is connected at one end to the exhaust device 1 and at the other end to the condensate tank 4 through the drain pipe 30; the low temperature condensate pump unit 10, the high temperature condensate pump unit 12, the circulating water pump unit 13, the cold circulating water pump unit 16, and the hot circulating water pump unit 19 are all two pumps connected in parallel.

[0019] The average temperature during the daytime high-temperature period is 30℃, and the average temperature during the nighttime low-temperature period is 20℃. The exhaust steam capacity of exhaust device 1 is 2190.0t / h.

[0020] Example 1 describes the usage mode of a direct air-cooled peak cooling system with dual cold and heat storage.

[0021] Low-temperature initial use mode: Steam source enters exhaust device 1, exhaust valve 26 opens, 1533t / h (70% of total steam) of steam enters air-cooled radiator 3 for cooling through main exhaust pipe 6, and the cooled condensate is collected by condensate tank 4 and sent out through condensate pipe 5. 657t / h (30% of total steam) of steam enters peak cooling tower 8 along secondary exhaust pipe 7. At this time, cold circulating water valve 14, hot circulating water valve 17, cold circulating water pump unit 16, hot circulating water pump unit 19, high-temperature condensate valve 22, and low-temperature condensate pump unit 10 are closed. When closed, the circulating water pump unit 13, circulating water valve 20, and low-temperature condensate valve 21 are opened, and the peak cooling tower cools the steam. The condensate generated by cooling enters the cold storage condensate tank 9 along the low-temperature condensate valve 21. After 4 hours, the exhaust valve 26 is closed, and the cold circulating water valve 14 is opened. The circulating water in the peak cooling tower is self-cooled. After cooling, it enters the cold storage circulating water tank 15 along the circulating water return pipe 25 and the cold circulating water valve 14. At this time, the loop consisting of the exhaust device 1, the main exhaust pipe 6, the air-cooled radiator 3, the condensate tank 4, and the condensate pipe 5 is operating normally.

[0022] High-temperature circulating operation mode: Hot circulating water pump unit 19, cold circulating water valve 14, circulating water valve 20, low-temperature condensate valve 21, high-temperature condensate pump unit 12, and return water valve 29 are closed; hot circulating water valve 17, cold circulating water pump unit 16, circulating water pump unit 13, exhaust valve 26, and low-temperature condensate pump unit 10 are open. 657t / h of steam (30% of the total steam volume) enters the peak steam flow through exhaust valve 26 and secondary exhaust pipe 7. Cooling tower 8 uses cold circulating water pump unit 16 to supply water to cool the steam in peak cooling tower 8. 1533 t / h of steam (70% of the total steam volume) is cooled along the exhaust device 1, main exhaust pipe 6, and air-cooled radiator 3 pipes. The cooled condensate enters condensate tank 4. The water temperature T1 in condensate tank 4 is 43℃, while the water temperature T2 in condensate return pipe 24 is 45℃. Since T1 < T2, the high-temperature condensate valve 22 is opened. With the warm condensate valve 27 and return water valve 28 closed, the condensate cooled in the peak cooling tower 8 is stored in the thermal storage condensate tank 11 through the condensate return water pipe 24 and the high-temperature condensate valve 22. The inlet flow rate of the thermal storage condensate tank 11 is 300 t / h. At the same time, the low-temperature condensate pump unit 10 supplies water to the exhaust steam device 1 to reduce the steam temperature in the exhaust steam device 1. At this time, the exhaust steam device 1, the main exhaust steam pipe 6, the air-cooled radiator 3, and the condensate tank are all connected. 4. The loop formed by the condensate pipe 5 is operating normally. The condensate flow rate generated in the exhaust device 1 is 300t / h. This part of the condensate enters the condensate tank 4 along the drain pump group 2 and drain pipe 30. After mixing with the condensate generated by the cooling steam of the air-cooled radiator 3, it is sent out by the condensate pipe 5. The hot circulating water that has absorbed the heat of the steam in the peak cooling tower 8 enters the heat storage circulating water tank 18 along the circulating water pump unit 13, circulating water return pipe 25, and hot circulating water valve 17.

[0023] Low-temperature circulating operation mode: Exhaust valve 26, low-temperature condensate valve 21, high-temperature condensate pump unit 12, hot circulating water pump unit 19, circulating water pump unit 13, and hot circulating water valve 17 are open. Cold circulating water valve 14, circulating water valve 20, low-temperature condensate pump unit 10, high-temperature condensate valve 12, cold circulating water pump unit 16, high-temperature condensate valve 27, return water valve 18, and return water valve 29 are also open. 1533t / h (70% of the total steam volume) of steam enters the air-cooled radiator 3 for cooling through the main exhaust pipe 6. The cooled condensate is collected in the condensate tank 4. 657t / h (30% of the total steam volume) of steam enters the peak cooling tower 8 along the secondary exhaust pipe 7. The hot circulating water pump unit 19 supplies water to the peak cooling tower 8 to cool the steam. The condensate generated by cooling flows at a flow rate of 250t / h through the low-temperature condensate valve 21. The condensate enters the storage condensate tank 9 for use in the high-temperature circulation mode. At this time, the difference between the subcooling (i.e., the saturation temperature corresponding to the unit's exhaust steam pressure) and the condensate tank water temperature is 1.4℃. In the high-temperature circulation mode, the high-temperature condensate stored in the storage condensate tank 11 enters the condensate tank 4 at a flow rate of 250t / h along the high-temperature condensate pump unit 12. After mixing with the condensate generated by the air-cooled radiator 3, it is sent out through the condensate pipe 5. After 4 hours, the exhaust valve 26 and the hot circulating water valve 17 are closed, and the cold circulating water valve 14 is opened. No more steam enters the peak cooling tower, and the circulating water in the peak cooling tower undergoes self-cooling. The cooled circulating water enters the storage circulating water tank 15 along the circulating water return pipe 25 and the cold circulating water valve 14. At this time, the loop consisting of the exhaust device 1, the main exhaust pipe 6, the air-cooled radiator 3, the condensate tank 4, and the condensate pipe 5 is operating normally.

Claims

1. A direct air-cooled peak cooling system with dual cold and heat storage, comprising a direct air-cooled energy storage system and a peak cooling energy storage system, characterized in that: The direct air-cooled energy storage system includes a direct air-cooling system, a condensate storage tank, a thermal condensate storage tank, and a direct air-cooled energy storage circulation unit. The direct air-cooled energy storage circulation unit includes an exhaust valve, a secondary exhaust pipe, a condensate return pipe, a low-temperature condensate valve, a low-temperature condensate pump unit, a high-temperature condensate valve (first), a high-temperature condensate pump unit, a high-temperature condensate valve (second), a return valve (second), and a return valve (first). The secondary exhaust pipe supplies steam to the peak cooling system. The exhaust valve is installed on the secondary exhaust pipe to cut off or open the secondary exhaust pipe or to regulate the steam flow. The condensate from the steam cooled by the peak cooling system is sent out through the condensate return pipe. One end of the low-temperature condensate valve is connected to the condensate return pipe, and the other end is connected to the condensate storage tank. One end of the low-temperature condensate pump unit is connected to the condensate storage tank, and the other end is connected to... The system includes a steam exhaust device; the peak cooling energy storage system comprises a peak cooling system, a cold storage circulating water tank, a heat storage circulating water tank, and a peak cooling energy storage circulation unit; the peak cooling energy storage circulation unit comprises a cold circulating water valve, a cold circulating water pump unit, a hot circulating water valve, and a hot circulating water pump unit; the cold circulating water valve connects or isolates the circulating water return pipe from the cold storage circulating water tank; one end of the cold circulating water pump unit is connected to the cold storage circulating water tank, and the other end is connected to the circulating water supply pipe; the hot circulating water valve connects or isolates the circulating water return pipe from the heat storage circulating water tank; one end of the hot circulating water pump unit is connected to the heat storage circulating water tank, and the other end is connected to the circulating water supply pipe; the direct air-cooled energy storage system and the peak cooling energy storage system are connected through the peak cooling system, coordinating cooling release when the ambient temperature is high and coordinating heat release when the ambient temperature is low, thereby improving the efficiency of the direct air-cooled system.

2. The direct air-cooled peak cooling system with dual cold and heat storage as described in claim 1, characterized in that: The direct air-cooling system includes a steam exhaust device, a condensate pump group, a condensate pipe, a main steam exhaust pipe, an air-cooled radiator, a condensate tank, and a condensate pipe. The steam exhaust device transports high-temperature steam to the air-cooled radiator through the main steam exhaust pipe. After the steam is cooled and condensed in the air-cooled radiator, it enters the condensate tank and is then discharged along the condensate pipe. The condensate in the steam exhaust device is then sent to the condensate tank by the condensate pump group through the condensate pipe.

3. The direct air-cooled peak cooling system with dual cold and heat storage as described in claim 1, characterized in that: The cold storage condensate tank is used to store low-temperature condensate generated by the cooling steam of the peak cooling tower when the ambient temperature is low. The cold storage condensate tank is installed above ground or underground and is insulated. The hot storage condensate tank is used to store high-temperature condensate generated by the cooling steam of the peak cooling tower when the ambient temperature is high. The hot storage condensate tank is installed above ground or underground and is insulated.

4. The direct air-cooled peak cooling system with dual cold and heat storage as described in claim 1, characterized in that: The low-temperature condensate pump unit is an N-way parallel pump, where N≥1 and N is an integer. It can mix the condensate in the condensate storage tank and supply it to the exhaust steam device.

5. The direct air-cooled peak cooling system with dual cold and heat storage as described in claim 4, characterized in that: The high-temperature condensate valve is connected at one end to the condensate return pipe and at the other end to the thermal condensate tank; the high-temperature condensate valve is connected at one end to the condensate tank and at the other end to the thermal condensate tank; the return valve is connected at one end to the condensate return pipe and at the other end to the condensate pipe; the return valve is connected at one end to the thermal condensate tank and at the other end to the condensate pipe; the high-temperature condensate pump unit is connected at one end to the thermal condensate tank and at the other end to the condensate tank. The high-temperature condensate pump unit is an M-channel parallel pump, where M≥1 and M is an integer, which can mix the condensate in the thermal condensate tank and supply it to the condensate tank.

6. The direct air-cooled peak cooling system with dual cold and heat storage as described in claim 1, characterized in that: The peak cooling system includes a peak cooling tower, a circulating water return pipe, a circulating water pump unit, a circulating water valve, and a circulating water supply pipe. The peak cooling tower cools the circulating water or steam. After participating in heat exchange within the peak cooling tower, the circulating water is sent out by the circulating water pump unit installed on the circulating water return pipe and then enters the circulating water supply pipe through the circulating water valve to supply water to the peak cooling tower, completing one cycle. The circulating water pump unit is a parallel pump with A circuits, where A ≥ 1 and A is an integer.

7. A direct air-cooled peak cooling system with dual cold and heat storage as described in claim 6, characterized in that: The peak cooling tower includes a tower body, a circulating water spray device, and a heat exchange coil. The tower body encloses the circulating water spray device and the heat exchange coil. The circulating water spray device atomizes the circulating water entering the tower along the circulating water supply pipe and sprays it onto the heat exchange coil to exchange heat with the steam in the heat exchange coil. One end of the heat exchange coil is connected to the secondary exhaust pipe and the other end is connected to the condensate return pipe.

8. The direct air-cooled peak cooling system with dual cold and heat storage as described in claim 1, characterized in that: The cold storage circulating water tank is used to store the cold circulating water after the peak cooling tower is cooled. The cold storage circulating water tank is installed above ground or underground and is insulated. The heat storage circulating water tank is used to store the hot circulating water after the peak cooling tower absorbs heat from the steam. The heat storage circulating water tank is installed above ground or underground and is insulated.

9. A direct air-cooled peak cooling system with dual cold and heat storage as described in claim 1, characterized in that: The cold circulating water pump unit can supply water from the cold storage circulating water tank to the peak cooling tower. It is a B-line parallel water pump, where B≥1 and B is an integer. The hot circulating water pump unit can supply water from the hot storage circulating water tank to the peak cooling tower. It is a C-line parallel water pump, where C≥1 and C is an integer.

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