Circulating water anti-freezing system of compressed air energy storage power station

Abstract

The utility model discloses a circulating water anti-freezing system of a compressed air energy storage power station, which belongs to the field of compressed air energy storage and comprises a plurality of mechanical ventilation cooling towers, a cooling tower water tank, flow channel equipment, a water absorption forebay, a plurality of circulating water pumps, a cooling device and a fan aeration device. The cooling towers are arranged in parallel; the cooling tower pools are communicated with each other; the circulating water pump is connected with the cooling device through a circulating water inlet pipe, the cooling device is connected with the cooling tower through a circulating water outlet pipe and a cooling tower water inlet pipe, and the cooling device is connected with the cooling tower water pool through the circulating water outlet pipe and a circulating water outlet bypass; the fan aeration device comprises a fan, an air conveying pipeline and an aeration pipe which are connected in sequence; and the fan is connected with the cooling tower water tank through an air conveying pipeline and an aeration pipe. The running stability and reliability of the circulating water system of the compressed air energy storage power station can be improved, and the running safety and reliability of the compressed air energy storage power station are further improved.

Description

Technical Field

[0001] The utility model relates to the field of compressed air energy storage, in particular to an antifreeze system for circulating water in a compressed air energy storage power station. Background Technique

[0002] In recent years, with the continuous increase in the proportion of new energy power generation in the new power system, the power grid pressure has been continuously increasing. Energy storage technology is an urgent need to solve the large-scale access of renewable energy, improve the efficiency, safety and economy of conventional power systems and regional energy systems; the compressed air energy storage system has the advantages of large scale, high efficiency, low cost, environmental protection, etc., and is one of the most promising large-scale energy storage technologies.

[0003] The circulating cooling water system is an important part of the compressed air energy storage power station, mainly responsible for providing cooling water for compressors, turbines, lubricating oils and other auxiliary machines in the compressed air energy storage system. The safe and stable operation of the circulating water system is an important prerequisite for ensuring the compressed air energy storage power station. The circulating cooling water system of the compressed air energy storage power station is different from that of thermal power stations, etc. In the compressed air energy storage power station, the circulating water system is put into use according to the operation requirements of the compression stage and the operation requirements of the expansion stage respectively. Compression and expansion are discontinuous and non-constant working conditions. Therefore, the circulating cooling water system of the compressed air energy storage power station operates discontinuously and non-constantly. Generally speaking, the load is high during the day, and low or zero load at night.

[0004] The cooling tower pool is an important device in the circulating cooling water system of the compressed air energy storage power station. Its main function is to accommodate the circulating cooling water and convey the cooled cooling water to the circulating water pump, so as to make the whole circulating water system operate efficiently and continuously. In cold northern regions, if the circulating water system operates discontinuously or at low load, the water temperature in the cooling tower pool is relatively low and there is a risk of freezing; if the pool is emptied, it is necessary to refill the water before the unit is restarted again, which is complicated and uneconomical to operate; if the pool freezes, the freezing will affect the safe start and operation of the circulating water pump, and further affect the start and operation of the whole compressed air system. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide an antifreeze system for circulating water in a compressed air energy storage power station, which can improve the operation stability and reliability of the circulating water system of the compressed air energy storage power station, and further improve the safety and reliability of the operation of the compressed air energy storage power station.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is:

[0007] An antifreeze system for circulating water in a compressed air energy storage power station includes a plurality of mechanical draft cooling towers, a cooling tower pool, a flow channel device, a suction forebay, a plurality of circulating water pumps, a cooling device and a blower aeration device;

[0008] The mechanical draft cooling towers are arranged in parallel.

[0009] The cooling tower basins are interconnected with each other.

[0010] The circulating water pump is connected to the cooling device through a circulating water inlet pipe. The cooling device is connected to the mechanical draft cooling tower through a circulating water outlet pipe and a cooling tower inlet pipe. The cooling device is connected to the cooling tower basin through a circulating water outlet pipe and a circulating water outlet bypass.

[0011] A further improvement of the technical solution of the present utility model lies in that: the cooling device includes a compression condition cooler, an expansion condition cooler and other coolers.

[0012] A further improvement of the technical solution of the present utility model lies in that: the fan aeration device includes a fan, an air delivery pipe and an aeration pipe connected in sequence; the fan is connected to the cooling tower basin through the air delivery pipe and the aeration pipe.

[0013] A further improvement of the technical solution of the present utility model lies in that: the aeration pipe is arranged on the side wall of the cooling tower basin.

[0014] Due to the adoption of the above technical solution, the technical progress achieved by the present utility model is as follows:

[0015] 1. Considering the discontinuous and non-constant operation of the compressed air energy storage power station, the present utility model proposes a circulating water system based on the compressed air energy storage power station, which can not only meet the circulating water requirements of the compressors and expanders in the compression and expansion conditions of the compressed air energy storage power station, but also meet the anti-freezing requirements of the circulating water in the non-compression and non-expansion conditions, reduce the power consumption within the station, and improve the efficiency of the compressed air energy storage unit.

[0016] 2. The anti-freezing technology of the cooling tower basin proposed by the present utility model can reduce the risk that the cooling tower freezes in the non-compression and non-expansion conditions of the compressed air energy storage power station, affecting the operation of the circulating water pump and the entire circulating water system, and improve the convenience, reliability and stability of the operation of the compressed air energy storage power station. Description of the Drawings

[0017] Figure 1 It is a circulating water anti-freezing system diagram of a compressed air energy storage power station of the present utility model;

[0018] Among them, 1. Mechanical draft cooling tower, 2. Cooling tower basin, 3. Flow channel equipment, 4. Suction forebay, 5. Circulating water pump, 6. Circulating water inlet pipe, 7. Compression condition cooler, 8. Expansion condition cooler, 9. Circulating water outlet pipe, 10. Cooling tower inlet pipe, 11. Circulating water outlet bypass, 12. Fan, 13. Air delivery pipe, 14. Aeration pipe. Detailed Embodiment

[0019] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments:

[0020] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0021] In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "several" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0022] As Figure 1 shown, a circulating water antifreeze system for a compressed air energy storage power station includes several mechanical draft cooling towers 1, cooling tower basins 2, flow channel equipment 3, pre-suction basins 4, several circulating water pumps 5, a cooling device, and an air and gas aeration device;

[0023] The mechanical draft cooling towers 1 are arranged in parallel;

[0024] The cooling tower basins 2 are interconnected with each other;

[0025] The circulating water pumps 5 are connected to the cooling device through a circulating water inlet pipe 6. The cooling device is connected to the mechanical draft cooling towers 1 through a circulating water outlet pipe 9 and a cooling tower inlet pipe 10. The cooling device is connected to the cooling tower basin 2 through a circulating water outlet pipe 9 and a circulating water outlet bypass 11; valves are provided on both the cooling tower inlet pipe 10 and the circulating water outlet bypass 11.

[0026] The cooling device includes a compression condition cooler 7, an expansion condition cooler 8, and other coolers;

[0027] The pool antifreeze device includes a blower 12, an air delivery pipe 13, and an air diffuser pipe 14 connected in sequence; the blower is connected to the cooling tower basin through the air delivery pipe and the air diffuser pipe; the air diffuser pipe 14 is arranged on the side wall of the cooling tower basin 2.

[0028] Usage method:

[0029] N mechanical draft cooling towers 1 are arranged in parallel; the cooling tower basins 2 are interconnected with each other; assuming there are M tons of circulating water, which enter N mechanical draft cooling towers 1 respectively. The N mechanical draft cooling towers 1 are arranged in parallel and adjacent to each other. The water inflow of each mechanical draft cooling tower 1 is M / N tons. After cooling, they all enter the bottom cooling tower basin 2, and after mixing, they enter the suction forebay through the flow channel equipment.

[0030] During the compression condition, the heat required for circulating cooling of the cooler is large and the load of the mechanical draft cooling tower 1 is high; during the expansion condition, the heat required for circulating cooling of the mechanical draft cooling tower 1 is small and the load of the mechanical draft cooling tower 1 is low. When the ambient temperature is high in summer, whether it is the compression condition or the expansion condition, there is no risk of icing in the mechanical draft cooling tower 1 and the circulating water system; when the ambient temperature is low in winter, the heat is large during the compression condition but the ambient temperature is low. The antifreeze of the circulating water system can be controlled by reducing the number of circulating water pumps 5 and mechanical draft cooling towers 1; the heat is small during the expansion condition and the ambient temperature is low at the same time. The antifreeze of the circulating water system can be controlled by switching the hot water to the cooling tower basin 2 through the circulating water outlet bypass 11; during the non-compression and non-expansion conditions, the circulating water system does not operate, and the antifreeze of the circulating water system can be controlled by the antifreeze system of the cooling tower basin 2.

[0031] During the non-compression and non-expansion conditions, the circulating water pumps 5 and the mechanical draft cooling towers 1 stop running, and at the same time, the fan 12 and the auxiliary system are started to aerate the side wall of the cooling tower basin 2 regularly to prevent the cooling tower basin 2 from icing due to static water flow, which affects the operation of the circulating water pump 5 when starting the unit under the compression and expansion conditions and further affects the normal operation of the unit.

[0032] In summary, the utility model can improve the operation stability and reliability of the circulating water system of the compressed air energy storage power station, and further improve the safety and reliability of the operation of the compressed air energy storage power station.

Claims

1. A circulating water anti-freezing system for a compressed air energy storage power station, characterized in that: It includes several mechanical draft cooling towers (1), cooling tower basins (2), flow channel equipment (3), suction forebays (4), several circulating water pumps (5), a cooling device and a fan aeration device; The mechanical draft cooling towers (1) are arranged in parallel; The cooling tower basins (2) are interconnected with each other; The circulating water pumps (5) are connected to the cooling device through a circulating water inlet pipe (6), and the cooling device is connected to the mechanical draft cooling towers (1) through a circulating water outlet pipe (9) and a cooling tower inlet pipe (10). The cooling device is connected to the cooling tower basin (2) through a circulating water outlet pipe (9) and a circulating water outlet bypass (11).

2. The circulating water anti-freezing system of the compressed air energy storage power station according to claim 1, characterized in that: The cooling device includes a compression condition cooler (7) and an expansion condition cooler (8).

3. The circulating water antifreeze system of the compressed air energy storage power station according to claim 1, characterized in that: The fan aeration device includes a fan (12), an air delivery pipe (13) and an air diffuser pipe (14) connected in sequence; the fan (12) is connected to the cooling tower basin (2) through the air delivery pipe (13) and the air diffuser pipe (14).

4. The circulating water antifreeze system of the compressed air energy storage power station according to claim 3, characterized in that: The air diffuser pipe (14) is arranged on the side wall of the cooling tower basin (2).

Images