Auxiliary machine circulating cooling water system

Abstract

The utility model relates to the technical field of industrial cooling equipment, solves the problem that the working condition of a circulating cooling water system cannot be adjusted according to the environment, and discloses an auxiliary machine circulating cooling water system which comprises a water return pipe, a water supply pipe, an air cooling unit and at least two parallel closed tower units, and the water supply pipe is communicated with the water return pipe after passing through an auxiliary machine; the air cooling unit comprises an air cooler with an air cooling water inlet end and an air cooling water outlet end, and the closed tower unit comprises a closed cooling tower with a closed tower water inlet end and a closed tower water outlet end; the air-cooling water inlet end is connected to the water return pipe, the air-cooling water outlet end is connected to the closed tower water inlet end, and the closed tower water outlet end is connected to the water supply pipe; the air cooling unit and the closed tower unit are respectively connected with a first bypass pipe and a second bypass pipe in parallel; the air cooling water inlet end, the air cooling water drainage end, the closed tower water inlet end, the closed tower water drainage end, the first by-pass pipe and the second by-pass pipe are all provided with on-off valves. The three heat exchange paths can be adjusted according to different temperatures, and damage to cooling equipment and loss of electric quantity are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of industrial cooling equipment, and in particular to an auxiliary machine circulating cooling water system. Background Art

[0002] Auxiliary equipment in the industrial production process refers to equipment that plays an auxiliary role for the main production equipment, such as conveying equipment, feeding equipment, discharge equipment, cleaning equipment and various parts. Especially in power plants, there will be a lot of waste heat in these auxiliary equipment. In order to ensure the normal operation of the equipment, a recyclable cooling water system is often used to reduce the temperature of the equipment.

[0003] Traditional open circulating cooling water systems mostly use air coolers for cooling. Not only is the heat exchange efficiency low at high temperatures and the axial flow fan of the air cooler easily damaged, but the cooling water is also easily contaminated and chlorinated by external impurities. Therefore, there is a closed cooling tower that can prevent the cooling water from directly contacting the outside world. The water inlet of the closed cooling tower is connected to the return pipe, and the water outlet is connected to the water supply pipe, thereby forming a closed circulating cooling water system; the cooled water flows out from the water supply pipe, and after the auxiliary machine absorbs heat, it flows into the closed cooling tower from the return pipe for cooling again. The cooling efficiency of the auxiliary machine is improved, and the blockage of the equipment caused by impurities entering the cooling water can be avoided.

[0004] However, due to the high ambient temperature in summer, low temperature in autumn and winter, and even long periods of low temperature in winter, only closed cooling towers are used to cool the circulating water. The operating conditions cannot be adjusted according to different usage environments, making it impossible for the pumps and fans in the circulating cooling water system to operate at full load when the temperature is high. This not only easily damages the cooling equipment, but also greatly increases power consumption, causing economic losses to the power plant. Utility Model Content

[0005] In order to improve the defect that the circulating cooling water system cannot adjust the working conditions according to the environment, the present application provides an auxiliary machine circulating cooling water system.

[0006] The present application provides an auxiliary machine circulating cooling water system, which adopts the following technical solution:

[0007] A circulating cooling water system for an auxiliary machine comprises a return pipe, a feed pipe, an air-cooling unit and at least two groups of closed-tower units connected in parallel, wherein the feed pipe is connected to the return pipe after passing through the auxiliary machine; the air-cooling unit comprises an air cooler having an air-cooling water inlet end and an air-cooling water discharge end, and the closed-tower unit comprises a closed cooling tower having a closed-tower water inlet end and a closed-tower water discharge end; the air-cooling water inlet end is connected to the return pipe, the air-cooling water discharge end is connected to the closed-tower water inlet end, and the closed-tower water discharge end is connected to the feed pipe; a first bypass pipe is connected in parallel to the air-cooling unit, and a second bypass pipe is connected in parallel to the closed-tower unit; on-off valves are provided on the air-cooling water inlet end, the air-cooling water discharge end, the closed-tower water inlet end, the closed-tower water discharge end, the first bypass pipe and the second bypass pipe.

[0008] By adopting the above technical solution, the outlet of the return pipe through the auxiliary machine is divided into two routes, one route is connected to the air cooling unit, and the other route is connected to the first bypass pipe. The air cooling unit and the first bypass pipe are connected in parallel and then connected in series with the parallel closed tower unit. The air cooler is suitable for dry environment and has low equipment cost. The closed cooling tower is suitable for high temperature and high humidity environment and has higher heat exchange efficiency than the air cooler. When the ambient temperature is high in summer (greater than 25°C), the on-off valves on the air cooling water inlet and air cooling water discharge ends of the air cooler and the on-off valve of the second bypass pipe are all closed, the on-off valves on the closed tower water inlet and closed tower water discharge ends of the closed cooling tower, and the on-off valve on the first bypass pipe are all opened, and the circulating water is directly cooled through multiple closed cooling towers. The cooled circulating water flows back to the auxiliary machine from the water supply pipe. The high-temperature return water will not pass through the air cooler, protecting the axial flow fan of the air cooler, and multiple closed cooling towers can quickly exchange heat and cool the circulating water; when the temperature is low in spring and autumn (less than 25°C and greater than When the temperature is lower than 0℃, the first bypass pipe and the second bypass pipe are closed, the air cooling unit is opened, and the required number of closed tower units are opened according to the actual temperature. The circulating water is first cooled by the air cooler and then cooled by the closed cooling tower. The lower water temperature will not damage the air cooler and can also reduce the power consumption of the closed cooling tower. After two different heat exchanges in the circulation loop, the heat exchange efficiency and effect are effectively improved. When the temperature is low for a long time in winter (less than 0℃), the first bypass pipe and the closed tower unit can be closed, the air cooling unit and the second bypass pipe can be opened, and the air cooler can be used for heat exchange directly. By setting the air cooling unit and the closed tower unit into three heat exchange paths, it can be adjusted according to different ambient temperatures, and the number of closed tower units in use can be further adjusted, which not only reduces the possibility of damage to the cooling equipment and extends the service life of the cooling equipment and auxiliary equipment, but also effectively improves the heat exchange efficiency, reduces the loss of electricity, and thus reduces energy waste.

[0009] Optionally, the air-cooling unit includes at least two air coolers connected in parallel, and the on-off valve is provided on the air-cooling water inlet end and the air-cooling water discharge end of each air cooler.

[0010] By adopting the above technical solution, an air-cooling unit is composed of at least two air coolers, and multiple air coolers are connected in parallel, which can not only cool the circulating water with a large flow rate, but also reduce the situation where the heat exchange tubes in the air cooler are fouled and the thermal resistance increases after long-term use, which leads to the blockage of a certain air cooler, thereby ensuring the normal operation of the entire auxiliary machine circulating cooling water system. In addition, the number of air coolers opened and closed can be further adjusted according to the ambient temperature and water flow, thereby better improving the heat exchange efficiency and energy utilization.

[0011] Optionally, the air-cooled water inlet end of each of the air coolers is provided with a water temperature sensor and a water pressure sensor, and the air-cooled water discharge end is provided with the water temperature sensor.

[0012] By adopting the above technical solution, the air-cooling unit is close to the water outlet side of the return pipe, so water temperature sensors and water pressure sensors are set at the water inlet end of the air cooler of the air-cooling unit, which can directly monitor the return water temperature and pressure of the circulating water, so as to determine whether to start the air-cooling unit, and the water pressure passing through the air cooler generally does not change, so only a water temperature sensor needs to be set at the discharge end of the air cooler to determine whether to start the closed tower unit and the number of closed cooling towers that need to be opened; thereby, the opening and closing of the air-cooling unit and the closed tower unit can be adjusted in a timely and efficient manner, further improving the efficiency and effect of heat exchange.

[0013] Optionally, the closed tower unit includes two closed cooling towers connected in parallel, and the on-off valve is provided on the closed tower water inlet end and the closed tower discharge end of each closed cooling tower.

[0014] By adopting the above technical solution, each closed tower unit is also configured with at least two parallel closed cooling towers, and the number of closed cooling towers in use can also be adjusted according to the circulating water flow rate, which also reduces the possibility of failure of the auxiliary machine circulating cooling water system.

[0015] Optionally, the closed tower unit also includes a first branch pipe and a second branch pipe, the air-cooled water inlet ends of all closed cooling towers in the closed tower unit are connected in parallel to the first branch pipe, and the air-cooled water discharge ends of all closed cooling towers in the closed tower unit are connected in parallel to the second branch pipe, and each of the first branch pipe and the second branch pipe is provided with a control valve, and the control valve is an electric valve, and the electric valve is electrically connected to the water temperature sensor and the water pressure sensor.

[0016] By adopting the above technical solution, electric valves are additionally arranged at the total water inlet and total water outlet of the closed tower unit, so that it is possible to timely determine whether the closed tower unit needs to be opened and the number of closed tower units that need to be opened according to the return water temperature and pressure, without the need for real-time monitoring and control by staff, thereby making the auxiliary machine circulating cooling water system more stable.

[0017] Optionally, the closed cooling towers in the two groups of closed tower units are respectively arranged as a first cooling tower and a second cooling tower, and the closed cooling towers have a plurality of one-to-one corresponding closed tower water inlet ends and closed tower drainage ends; the plurality of closed tower water inlet ends of the first cooling tower are connected in series, and the plurality of closed tower drainage ends of the first cooling tower are connected in series, and the plurality of closed tower water inlet ends of the second cooling tower are connected in parallel, and the plurality of closed tower drainage ends of the second cooling tower are connected in parallel.

[0018] By adopting the above technical scheme, the number of closed tower units is two groups, which can meet the use requirements of most power plants. Each closed cooling tower has multiple closed tower water inlets and closed tower drainage ends, and the multiple closed tower water inlets and closed tower drainage ends of the closed cooling towers of one of the closed tower units are respectively connected in series, and the multiple closed tower water inlets and closed tower drainage ends of the other closed cooling tower are respectively connected in parallel; when the ambient temperature is high, the closed tower water inlets and closed tower drainage ends of the four closed cooling towers of the two closed tower units are all opened. As the temperature or flow decreases, some of the closed tower water inlets and closed tower drainage ends can be closed by the on-off valves accordingly, which can further better adapt to changes in ambient temperature and circulating water flow, thereby better reducing energy consumption and damage to equipment.

[0019] Optionally, the water temperature sensor and the water pressure sensor are both provided on the first branch pipe and the second branch pipe of the second cooling tower.

[0020] By adopting the above technical scheme, the closed tower water inlet end and the closed tower drainage end of the second cooling tower are respectively connected in parallel, and water temperature sensors and water pressure sensors are arranged on the inlet and outlet sides of the second cooling tower to further monitor the water temperature and water pressure flowing into the closed tower unit, so as to determine whether to open the second cooling tower and the number of closed tower water inlet ends and closed tower drainage ends that need to be opened.

[0021] Optionally, the on-off valves on the first bypass pipe and the second bypass pipe are both electric valves, and the electric valves are both electrically connected to the water temperature sensor and the water pressure sensor.

[0022] By adopting the above technical solution, the first bypass pipe and the second bypass pipe control the opening and closing of the pipeline through the electric valve, so that it can be determined in time whether the air-cooling unit or the closed tower unit needs to be turned on according to the return water temperature and pressure, without the need for real-time monitoring and control by staff, making the auxiliary machine circulating cooling water system more stable.

[0023] In summary, the present application includes at least one of the following beneficial effects:

[0024] 1. By setting the air cooling unit and the closed tower unit into three heat exchange paths, it can be adjusted according to different ambient temperatures, and the number of closed tower units in use can be further adjusted, reducing the possibility of damage to the cooling equipment and extending the service life of the cooling equipment and auxiliary equipment;

[0025] 2. Effectively improve the heat exchange efficiency, reduce the loss of electricity, and thus reduce the waste of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the auxiliary machine circulating cooling water system in the embodiment of the present application;

[0027] Figure 2 It is a partial structural diagram of the auxiliary machine circulating cooling water system regarding the air cooling unit in the embodiment of the present application;

[0028] Figure 3 It is a partial structural diagram of the auxiliary machine circulating cooling water system regarding the first closed tower group in the embodiment of the present application;

[0029] Figure 4 It is a schematic diagram of the partial structure of the auxiliary machine circulating cooling water system regarding the second closed tower group in the embodiment of the present application.

[0030] Explanation of the reference numerals in the accompanying drawings: 100, return pipe; 200, water supply pipe; 300, air-cooling unit; 400, closed tower unit; 410, first cooling tower; 420, second cooling tower; 1, air cooler; 11, air-cooling water inlet end; 12, air-cooling drainage end; 13, first connecting pipe; 14, second connecting pipe; 2, closed cooling tower; 21, closed tower water inlet end; 22, closed tower drainage end; 3, first branch pipe; 4, second branch pipe; 5, first bypass pipe; 6, second bypass pipe; 7, on-off valve; 8, water temperature sensor; 9, water pressure sensor; 10, control valve; 101, electric valve. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 This application is described in further detail.

[0032] Reference Figure 1The embodiment of the present application discloses an auxiliary machine circulating cooling water system, an auxiliary machine circulating cooling water system, including a return pipe 100, a water supply pipe 200, an air cooling unit 300 and at least two parallel closed tower units 400. After the cooling water in the water supply pipe 200 passes through the auxiliary machine and absorbs the heat of the auxiliary machine, it flows from the return pipe 100 into the air cooling unit 300 and / or the closed tower unit 400 to be cooled by heat exchange to form a closed circulating water system. By setting the air cooling unit 300 and the closed tower unit 400 into three heat exchange paths, it can be adjusted according to different ambient temperatures, and the number of closed tower units 400 used can be further adjusted, which reduces the possibility of damage to the cooling equipment and extends the service life of the cooling equipment and auxiliary equipment; effectively improves the heat exchange efficiency, reduces the loss of electricity, and thus reduces the waste of energy.

[0033] The air-cooling unit 300 includes an air cooler 1, which has an air-cooling water inlet 11 and an air-cooling water outlet 12. The closed tower unit 400 includes a closed cooling tower 2, which has a closed tower water inlet 21 and a closed tower water outlet 22. The air-cooling water inlet 11 is connected to the return water pipe 100. The circulating water enters the air cooler 1 from the air-cooling water inlet 11, passes through the heat dissipation fins inside the air cooler 1, and is cooled by heat exchange, and then flows out from the air-cooling water outlet 12. The air-cooling water outlet 12 is connected to the closed tower water inlet 21, and the closed tower water outlet 22 is connected to the water supply pipe 200. It should be noted that the air cooler 1 and the closed cooling tower 2 are both heat exchange devices for cooling fluids. The air cooler 1 is suitable for dry environments and has low equipment costs. The closed cooling tower 2 is suitable for high temperature and high humidity environments, and has a higher heat exchange efficiency than the air cooler 1.

[0034] Reference Figure 1The air cooling unit 300 is connected in parallel with a first bypass pipe 5, and the closed tower unit 400 is connected in parallel with a second bypass pipe 6, that is, the air cooling unit 300 and the first bypass pipe 5 are connected in parallel and then connected in series with the parallel closed tower unit 400. The air cooling water inlet end 11, the air cooling water discharge end 12, the closed tower water inlet end 21, the closed tower water discharge end 22, the first bypass pipe 5 and the second bypass pipe 6 are all provided with an on-off valve 7 that can open and close the pipeline, so that three heat exchange paths can be realized. When the ambient temperature is high in summer (e.g., greater than or equal to 25°C), the on-off valves 7 of the air cooler 1 and the second bypass pipe 6 are closed, the on-off valves 7 of the closed cooling tower 2 and the first bypass pipe 5 are opened, and the circulating water is directly cooled by multiple closed cooling towers 2 with high heat exchange efficiency. The high-temperature circulating water will not pass through the air cooler 1, thereby protecting the axial flow fan of the air cooler 1, and multiple closed cooling towers 2 can quickly exchange heat and cool the circulating water; when the temperature is low in spring and autumn (less than 25°C and greater than 0°C), the first bypass pipe 5 and the second bypass pipe 6 are closed, and the air cooling unit 300 is opened, according to the actual The required number of closed tower units 400 are opened according to the temperature conditions. The circulating water is first cooled once by the air cooler 1, and then cooled twice by the closed cooling tower 2. The lower water temperature will not cause damage to the air cooler 1, and can also reduce the power consumption of the closed cooling tower 2. The heat exchange is carried out twice in the circulation loop, which effectively improves the heat exchange efficiency and effect. When the temperature is low for a long time in winter (less than 0°C), the first bypass pipe 5 and the closed tower unit 400 are closed, the air cooling unit 300 and the second bypass pipe 6 are opened, and the circulating water is directly cooled by the air cooler 1, which is more energy-efficient than the closed cooling tower 2.

[0035] The air cooler 1 in the air cooling unit 300 may be one or more, see Figure 2 In this embodiment, an air-cooling unit 300 includes two air coolers 1 connected in parallel. The air-cooling water inlet end 11 and the air-cooling water discharge end 12 of each air cooler 1 are respectively connected to a first connecting pipe 13 and a second connecting pipe 14. The two first connecting pipes 13 are connected in parallel to the return pipe 100, and the two second connecting pipes 14 are connected in parallel to the closed tower unit 400. An on-off valve 7 is provided on each first connecting pipe 13 and the second connecting pipe 14, a water temperature sensor 8 and a water pressure sensor 9 are provided on each first connecting pipe 13, and a water temperature sensor 8 is provided on each second connecting pipe 14. The two air coolers 1 connected in parallel can not only cool a large flow of circulating water, but also reduce the situation that the heat exchange tubes in the air cooler 1 are fouled and the thermal resistance increases after long-term use, which leads to the blockage of a certain air cooler 1, thereby ensuring the normal operation of the entire auxiliary machine circulating cooling water system. In addition, each air cooler 1 has an on-off valve 7 at the water inlet and outlet ends, which can further adjust the opening and closing quantity of the air cooler 1 according to the return water temperature and pressure of the circulating water, thereby better improving the heat exchange efficiency and energy utilization rate.

[0036] Reference Figure 1In the present embodiment, the number of closed cooling towers 2 in the closed tower unit 400 is preferably two, and an on-off valve 7 is provided on the closed tower water inlet end 21 and the closed tower water discharge end 22 of each closed cooling tower 2, so that the opening and closing of each closed cooling tower 2 can be controlled individually, and the possibility of failure of the auxiliary machine circulating cooling water system is further reduced; the closed tower unit 400 also includes a first branch pipe 3 and a second branch pipe 4, and the air-cooled water inlet ends 11 of all the closed cooling towers 2 in a closed tower unit 400 are connected in parallel to the first branch pipe 3, and the air-cooled water discharge ends 12 of all the closed cooling towers 2 are connected in parallel to the second branch pipe 4. Furthermore, each of the first branch pipe 3 and the second branch pipe 4 is provided with a control valve 10 which can open and close the pipeline, and the control valve 10 is an electric valve 101, which is electrically connected to the water temperature sensor 8 and the water pressure sensor 9, so that it can timely determine whether it is necessary to open the closed tower unit 400 and the number of closed tower units 400 that need to be opened according to the return water temperature and pressure, without the need for real-time monitoring and control by staff; it should also be noted that the on-off valve 7 can be an electric valve 101 or a manual valve.

[0037] In some embodiments, the structures of the closed cooling towers 2 in the two closed tower units 400 may be completely identical.

[0038] In some embodiments, reference Figure 3 and Figure 4 The closed cooling towers 2 in the two groups of closed tower units 400 are respectively arranged as a first cooling tower 410 and a second cooling tower 420, and the closed cooling tower 2 has a plurality of one-to-one corresponding closed tower water inlet ends 21 and closed tower drainage ends 22; the plurality of closed tower water inlet ends 21 of the first cooling tower 410 are connected in series, the plurality of closed tower drainage ends 22 of the first cooling tower 410 are connected in series, and an on-off valve 7 is arranged on the series pipeline of the closed tower water inlet end 21, and an on-off valve 7 is also arranged on the series pipeline of the closed tower drainage end 22; the plurality of closed tower water inlet ends 21 of the second cooling tower 420 are connected in parallel, the plurality of closed tower drainage ends 22 of the second cooling tower 420 are connected in parallel, and an on-off valve 7 is arranged on the parallel pipeline of each closed tower water inlet end 21, and an on-off valve 7 is also arranged on the parallel pipeline of each closed tower drainage end 22. The two closed tower units 400 have a total of four closed cooling towers 2, and different flow paths can be formed in the four closed cooling towers 2. When in a high temperature environment for a long time, all the closed tower water inlet ends 21 and closed tower drainage ends 22 can be opened; as the temperature or flow decreases, part of the closed tower water inlet ends 21 and closed tower drainage ends 22 can be closed accordingly through the on-off valve 7, which can further better adapt to changes in ambient temperature and circulating water flow, thereby better reducing energy consumption and damage to equipment.

[0039] In addition, refer to Figure 4Since the closed tower water inlet end 21 and the closed tower drainage end 22 of the second cooling tower 420 are respectively connected in parallel, a water temperature sensor 8 and a water pressure sensor 9 can be further arranged on the first branch pipe 3 and the second branch pipe 4 of the second cooling tower 420 to monitor the water temperature and water pressure flowing into the closed tower unit 400 in real time, so as to determine whether to open the second cooling tower 420 and the number of closed tower water inlet ends 21 and closed tower drainage ends 22 that need to be opened.

[0040] As a preferred embodiment, the on-off valves 7 on the first bypass pipe 5 and the second bypass pipe 6 are both electric valves 101, and the electric valves 101 are electrically connected to the water temperature sensor 8 and the water pressure sensor 9. On the one hand, it can be determined in time whether to start the air cooling unit 300 or the closed tower unit 400 according to the return water temperature and pressure. On the other hand, the first bypass pipe 5 and the second bypass pipe 6 can also balance the pressure drop on the pipe side, making the auxiliary machine circulating cooling water system more stable.

[0041] The implementation principle of an auxiliary machine circulating cooling water system in the embodiment of the present application is:

[0042] When the temperature is high for a long time in summer, the air cooler 1 and the second bypass pipe 6 are closed, the closed cooling tower 2 and the first bypass pipe 5 are opened, and the circulating water is cooled directly through multiple closed cooling towers 2, and the cooled circulating water flows back to the auxiliary machine from the water supply pipe 200; when the temperature is low in spring and autumn, the first bypass pipe 5 and the second bypass pipe 6 are closed, the air cooling unit 300 is opened, and the required number of closed tower units 400 are opened according to the actual temperature conditions. The circulating water is first cooled once through the air cooler 1, and then cooled twice through the closed cooling tower 2. It undergoes two different heat exchanges in the circulation loop, which effectively improves the heat exchange efficiency and reduces power consumption; when the temperature is low for a long time in winter, the first bypass pipe 5 and the closed tower unit 400 can be closed, the air cooling unit 300 and the second bypass pipe 6 can be opened, and the heat exchange is directly performed by the air cooler 1.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An auxiliary machine circulating cooling water system, characterized in that: The invention comprises a return pipe (100), a water supply pipe (200), an air cooling unit (300) and at least two sets of parallel closed tower units (400), wherein the water supply pipe (200) is connected to the return pipe (100) after passing through an auxiliary machine; the air cooling unit (300) comprises an air cooler (1), wherein the air cooler (1) has an air cooling water inlet end (11) and an air cooling water discharge end (12); the closed tower unit (400) comprises a closed cooling tower (2), wherein the closed cooling tower (2) has a closed tower water inlet end (21) and a closed tower water discharge end (22); the air cooling water inlet end (11) The air-cooling unit (300) is connected to the return pipe (100), the air-cooling drainage end (12) is connected to the closed tower water inlet end (21), and the closed tower drainage end (22) is connected to the water supply pipe (200); the air-cooling unit (300) is connected in parallel with a first bypass pipe (5), and the closed tower unit (400) is connected in parallel with a second bypass pipe (6); the air-cooling water inlet end (11), the air-cooling drainage end (12), the closed tower water inlet end (21), the closed tower drainage end (22), the first bypass pipe (5), and the second bypass pipe (6) are all provided with on-off valves (7).

2. The auxiliary machine circulating cooling water system according to claim 1, characterized in that: The air-cooling unit (300) comprises at least two air coolers (1) connected in parallel, and the on-off valve (7) is provided on the air-cooling water inlet end (11) and the air-cooling water discharge end (12) of each air cooler (1).

3. The auxiliary machine circulating cooling water system according to claim 2, characterized in that: The air-cooling water inlet end (11) of each air cooler (1) is provided with a water temperature sensor (8) and a water pressure sensor (9), and the air-cooling water discharge end (12) is provided with the water temperature sensor (8).

4. The auxiliary machine circulating cooling water system according to claim 3, characterized in that: The closed tower unit (400) comprises two closed cooling towers (2) connected in parallel, and the on-off valve (7) is provided on the closed tower water inlet end (21) and the closed tower water discharge end (22) of each closed cooling tower (2).

5. The auxiliary machine circulating cooling water system according to claim 4, characterized in that: The closed tower unit (400) further comprises a first branch pipe (3) and a second branch pipe (4); the air-cooled water inlet ends (11) of all the closed cooling towers (2) in the closed tower unit (400) are connected in parallel to the first branch pipe (3); the air-cooled water discharge ends (12) of all the closed cooling towers (2) are connected in parallel to the second branch pipe (4); each of the first branch pipe (3) and the second branch pipe (4) is provided with a control valve (10); the control valve (10) is an electric valve (101); and the electric valve (101) is electrically connected to the water temperature sensor (8) and the water pressure sensor (9).

6. The auxiliary machine circulating cooling water system according to claim 5, characterized in that: The closed cooling towers (2) in the two groups of closed tower units (400) are respectively configured as a first cooling tower (410) and a second cooling tower (420), and the closed cooling towers (2) have a plurality of closed tower water inlet ends (21) and closed tower drainage ends (22) that correspond to each other. The plurality of closed tower water inlet ends (21) of the first cooling tower (410) are connected in series, and the plurality of closed tower drainage ends (22) of the first cooling tower (410) are connected in series, and the plurality of closed tower water inlet ends (21) of the second cooling tower (420) are connected in parallel, and the plurality of closed tower drainage ends (22) of the second cooling tower (420) are connected in parallel.

7. The auxiliary machine circulating cooling water system according to claim 6, characterized in that: The first branch pipe (3) and the second branch pipe (4) of the second cooling tower (420) are both provided with the water temperature sensor (8) and the water pressure sensor (9).

8. The auxiliary machine circulating cooling water system according to claim 7, characterized in that: The on-off valves (7) on the first bypass pipe (5) and the second bypass pipe (6) are both the electric valves (101), and the electric valves (101) are both electrically connected to the water temperature sensor (8) and the water pressure sensor (9).

Images