Auxiliary machine cooling water system and power plant

Abstract

The utility model discloses an auxiliary machine cooling water system and a power plant. The auxiliary machine cooling water system comprises a first cooling module, a second cooling module, a first connecting pipe, a first control valve, a second connecting pipe and a second control valve. The other end of the first connecting pipe is communicated with the end, away from the second water tank, of the second water supply pipe. And the other end of the second connecting pipe is communicated with one end, far away from the second water tank, of the second water return pipe. According to the auxiliary machine cooling water system, when one of the first unit and the second unit is shut down and the other one is operated, one of the first water pump and the second water pump is correspondingly shut down, and cooling water is supplied through the other one of the first water pump and the second water pump, so that the requirements of the first unit and the second unit for the cooling water are met at the same time; the operation power consumption of the auxiliary machine cooling water system is reduced, and the energy-saving and consumption-reducing effects are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of water cooling of generator sets, in particular to an auxiliary machine cooling water system and a power plant. Background Art

[0002] In a power plant, the main function of the auxiliary equipment cooling water system is to remove the heat generated by the operation of related auxiliary equipment through cooling water, maintain the normal operating temperature of the equipment, and ensure the safe operation of the equipment.

[0003] The auxiliary cooling water system mainly provides cooling water for the turbine room, boiler room, and auxiliary equipment in the plant area, such as turbine lubricating oil cooler, generator hydrogen cooler, generator stator water cooler, condensate pump bearing cooling water, boiler room auxiliary equipment (coal-fired units have primary fans, forced draft fans, induced draft fan lubricating oil stations, etc., gas-steam combined cycle units have high-pressure feed water pumps, medium-pressure feed water pumps, condensate heater circulation pumps, etc.), air compressors, etc. Gas-steam combined cycle power plants also need to provide cooling water for gas turbine island auxiliary equipment such as gas turbine lubricating oil coolers and gas turbine generator hydrogen coolers. For large and medium-sized thermal power plants and gas-steam combined cycle power plants, the auxiliary cooling water system generally adopts a unit system, that is, each generator set is equipped with an independent auxiliary cooling water system. However, after the generator set is shut down, the turbine lubricating oil needs to be supplied with cooling water during the period when it cannot be stopped, and the air compressor cooling water also needs to be put into use. The water pump in the auxiliary cooling system needs to operate at high power, and the water pump consumes high power when operating, which is not economical. Utility Model Content

[0004] Based on this, it is necessary to provide an auxiliary machine cooling water system and power plant to address the problems that after the generator set is shut down, the steam turbine lubricating oil cannot be stopped and cooling water needs to be supplied, the air compressor cooling water also needs to be put into use, the water pump in the auxiliary machine cooling system needs to operate at high power, the water pump consumes high power during operation, and the operation is uneconomical.

[0005] The technical solution is as follows:

[0006] On the one hand, an auxiliary machine cooling water system is provided, which is applied to a power plant, wherein the power plant includes a first unit and a second unit, and the auxiliary machine cooling water system includes:

[0007] A first cooling module, the first cooling module comprising a first water tank, a first water pump, a first heat exchanger, a first water supply pipe and a first water return pipe, the first water tank is in communication with one end of the first water supply pipe and one end of the first water return pipe, the first water pump and the first heat exchanger are both installed on the first water supply pipe, the other end of the first water supply pipe is in communication with a water inlet of a first device to be cooled in the first unit, and the other end of the first water return pipe is in communication with a water outlet of the first device to be cooled;

[0008] a second cooling module, the second cooling module comprising a second water tank, a second water pump, a second heat exchanger, a second water supply pipe and a second water return pipe, the second water tank and one end of the second water supply pipe and one end of the second water return pipe, the second water pump and the second heat exchanger are both installed on the second water supply pipe, the other end of the second water supply pipe is connected to the water inlet of the second device to be cooled in the second unit, and the other end of the second water return pipe is connected to the water outlet of the second device to be cooled;

[0009] a first communication pipe and a first control valve, wherein one end of the first communication pipe is connected to an end of the first water supply pipe away from the first water tank, and the other end is connected to an end of the second water supply pipe away from the second water tank, and the first control valve is installed on the first communication pipe;

[0010] A second connecting pipe and a second control valve, one end of the second connecting pipe is connected to an end of the first return pipe away from the first water tank, and the other end is connected to an end of the second return pipe away from the second water tank, and the second control valve is installed on the second connecting pipe.

[0011] The technical solution is further described below:

[0012] In one embodiment, the first cooling module further includes a third water pump, which is installed on the first water supply pipe and arranged in parallel with the first water pump, and the motor power of the third water pump is smaller than the motor power of the first water pump.

[0013] In one embodiment, the motor power of the first water pump is 300kW, the pump flow rate of the first water pump is 1800t / h, and the voltage level of the first water pump is 6kV; the motor power of the third water pump is 30kW, the pump flow rate of the third water pump is 250t / h, and the voltage level of the third water pump is 380V.

[0014] In one embodiment, the number of the first water pumps is at least two, and each of the first water pumps is installed in parallel on the first water supply pipe.

[0015] In one embodiment, the number of the first heat exchangers is at least two, and each of the first heat exchangers is installed in parallel on the first water supply pipe.

[0016] In one embodiment, the second cooling module further includes a fourth water pump, which is installed on the second water supply pipe and arranged in parallel with the second water pump, and the power of the fourth water pump is less than that of the second water pump.

[0017] In one embodiment, the number of the second water pumps is at least two, and each of the second water pumps is installed in parallel on the second water supply pipe.

[0018] In one embodiment, the number of the second heat exchangers is at least two, and each of the second heat exchangers is installed in parallel on the second water supply pipe.

[0019] In one embodiment, the first water tank is located above the first water pump;

[0020] And / or, the second water tank is located above the second water pump.

[0021] On the other hand, a power plant is provided, comprising a first unit, a second unit and the auxiliary machine cooling water system, wherein the first unit is connected to the first water supply pipe and the first water return pipe respectively, and the second unit is connected to the second water supply pipe and the second water return pipe respectively.

[0022] In the auxiliary cooling water system and power plant in the above embodiment, when the first unit is running and the second unit is shut down, the second water pump stops running, the first control valve and the second control valve are both opened, so that the first cooling module is interconnected with the second cooling module, and the first water pump can supply cooling water to the second equipment to be cooled in the second unit through the first water supply pipe, the first connecting pipe and the second water supply pipe. Since the demand for cooling water after the second unit is shut down is small, the interconnected first cooling module can simultaneously meet the demand for cooling water of the first unit and the second unit. When the first unit is shut down and the second unit is running, its working principle is similar to the above, and will not be described in detail here. The auxiliary cooling water system in this application can stop one of the first water pump and the second water pump when one of the first unit and the second unit is shut down and the other is running, and supply cooling water through the other of the first water pump and the second water pump to simultaneously meet the demand for cooling water of the first unit and the second unit, reduce the operating power consumption of the auxiliary cooling water system, and achieve the effect of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1The figure is a schematic structural diagram of an auxiliary machine cooling water system according to an embodiment.

[0026] Description of reference numerals:

[0027] 10. Auxiliary machine cooling water system; 100. First cooling module; 110. First water tank; 120. First water pump; 130. First heat exchanger; 140. First water supply pipe; 150. First return pipe; 160. Third water pump; 200. Second cooling module; 210. Second water tank; 220. Second water pump; 230. Second heat exchanger; 240. Second water supply pipe; 250. Second return pipe; 260. Fourth water pump; 310. First connecting pipe; 320. First control valve; 410. Second connecting pipe; 420. Second control valve; 20. First unit; 21. First equipment to be cooled; 30. Second unit; 31. Second equipment to be cooled. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] like Figure 1As shown, in one embodiment, an auxiliary machine cooling water system 10 is provided, which is applied to a power plant. The power plant includes a first unit 20 and a second unit 30. The auxiliary machine cooling water system 10 includes a first cooling module 100, a second cooling module 200, a first connecting pipe 310, a first control valve 320, a second connecting pipe 410 and a second control valve 420. The first cooling module 100 includes a first water tank 110, a first water pump 120, a first heat exchanger 130, a first water supply pipe 140 and a first water return pipe 150. The first water tank 110 is connected to one end of the first water supply pipe 140 and one end of the first water return pipe 150. The first water pump 120 and the first heat exchanger 130 are both installed on the first water supply pipe 140. The other end of the first water supply pipe 140 is connected to the water inlet of the first device to be cooled 21 in the first unit 20, and the other end of the first water return pipe 150 is connected to the water outlet of the first device to be cooled 21. The second cooling module 200 includes a second water tank 210, a second water pump 220, a second heat exchanger 230, a second water supply pipe 240 and a second water return pipe 250. The second water tank 210 is connected to one end of the second water supply pipe 240 and one end of the second water return pipe 250. The second water pump 220 and the second heat exchanger 230 are both installed on the second water supply pipe 240. The other end of the second water supply pipe 240 is connected to the water inlet of the second device to be cooled 31 in the second unit 30, and the other end of the second water return pipe 250 is connected to the water outlet of the second device to be cooled 31. One end of the first connecting pipe 310 is connected to one end of the first water supply pipe 140 away from the first water tank 110, and the other end is connected to one end of the second water supply pipe 240 away from the second water tank 210. The first control valve 320 is installed on the first connecting pipe 310. One end of the second communication pipe 410 is connected to one end of the first return pipe 150 away from the first water tank 110 , and the other end is connected to one end of the second return pipe 250 away from the second water tank 210 . The second control valve 420 is installed on the second communication pipe 410 .

[0030] In the auxiliary cooling water system 10 in the above embodiment, when the first unit 20 is running and the second unit 30 is shut down, the second water pump 220 stops running, the first control valve 320 and the second control valve 420 are both opened, so that the first cooling module 100 is interconnected with the second cooling module 200, and the first water pump 120 can supply cooling water to the second device to be cooled 31 in the second unit 30 through the first water supply pipe 140, the first connecting pipe 310 and the second water supply pipe 240. Since the demand for cooling water after the second unit 30 is shut down is small, the interconnected first cooling module 100 can simultaneously meet the demand for cooling water of the first unit 20 and the second unit 30. When the first unit 20 is shut down and the second unit 30 is running, its working principle is similar to the above, and will not be described in detail here. The auxiliary machine cooling water system 10 in the present application can shut down one of the first unit 20 and the second unit 30 while the other one is running, and correspondingly shut down one of the first water pump 120 and the second water pump 220, and supply cooling water through the other one of the first water pump 120 and the second water pump 220, so as to simultaneously meet the cooling water needs of the first unit 20 and the second unit 30, reduce the operating power consumption of the auxiliary machine cooling water system 10, and achieve the effect of energy saving and consumption reduction.

[0031] Specifically in this embodiment, the first water tank 110 and the second water tank 210 can be set as closed-cycle expansion water tanks. The first control valve 320 and the second control valve 420 are both set as electric shut-off valves. The first equipment to be cooled 21 and the first equipment to be cooled 21 both include but are not limited to steam turbine lubricating oil coolers, air compressors, and other auxiliary equipment. The power plant can be set as a gas-steam combined cycle power plant or a thermal power plant.

[0032] Specifically in this embodiment, along the extension direction of the first water supply pipe 140, the first water pump 120 is located on the side of the first heat exchanger 130 close to the first water tank 110. In this way, the cooling water in the first water tank 110 is supplied to the first device to be cooled 21 after being pressurized by the first water pump 120 and cooled by the first heat exchanger 130, and is circulated.

[0033] Specifically in this embodiment, along the extension direction of the second water supply pipe 240, the second water pump 220 is located on the side of the second heat exchanger 230 close to the second water tank 210. In this way, the cooling water in the second water tank 210 is supplied to the second device to be cooled 31 after being pressurized by the second water pump 220 and cooled by the second heat exchanger 230, and is circulated.

[0034] like Figure 1As shown, further, the first cooling module 100 also includes a third water pump 160, which is installed on the first water supply pipe 140 and is arranged in parallel with the first water pump 120, and the motor power of the third water pump 160 is less than the motor power of the first water pump 120. In this way, when the second unit 30 is not running (that is, the second cooling module 200 is not running), and the first unit 20 is shut down, the first water pump 120 is stopped, and the third water pump 160 is started to meet the demand of the first unit 20 for cooling water, avoid excess performance, reduce the operating power consumption of the auxiliary machine cooling water system 10, and achieve the effect of energy saving and consumption reduction.

[0035] Optionally, the motor power of the first water pump 120 is 300kW, the pump flow rate of the first water pump 120 is 1800t / h, and the voltage level of the first water pump 120 is 6kV; the motor power of the third water pump 160 is 30kW, the pump flow rate of the third water pump 160 is 250t / h, and the voltage level of the third water pump 160 is 380V.

[0036] like Figure 1 As shown, optionally, the number of the first water pumps 120 is at least two, and each of the first water pumps 120 is installed in parallel on the first water supply pipe 140 .

[0037] like Figure 1 As shown, optionally, the number of the first heat exchangers 130 is at least two, and each first heat exchanger 130 is installed in parallel on the first water supply pipe 140 .

[0038] Specifically in this embodiment, there are two first water pumps 120, one of which is used for operation and the other is used for standby. There are two first heat exchangers 130, one of which is used for operation and the other is used for standby. In this way, the reliability of the auxiliary machine cooling water system 10 is improved.

[0039] like Figure 1 As shown, in one embodiment, the second cooling module 200 further includes a fourth water pump 260, which is installed on the second water supply pipe 240 and is arranged in parallel with the second water pump 220, and the power of the fourth water pump 260 is less than the power of the second water pump 220. In this way, when the first unit 20 is not running (that is, the first cooling module 100 is not running either), and the second unit 30 is shut down, the second water pump 220 is stopped, and the fourth water pump 260 is started to meet the cooling water demand of the second unit 30, avoid excess performance, reduce the operating power consumption of the auxiliary machine cooling water system 10, and achieve the effect of energy saving and consumption reduction.

[0040] Optionally, the motor power of the second water pump 220 is 300kW, the pump flow of the second water pump 220 is 1800t / h, and the voltage level of the second water pump 220 is 6kV; the motor power of the fourth water pump 260 is 30kW, the pump flow of the fourth water pump 260 is 250t / h, and the voltage level of the fourth water pump 260 is 380V.

[0041] Specifically in this embodiment, for the peak-shaving gas-steam combined cycle unit, the unit operates in two shifts, the unit is frequently started and stopped, and the auxiliary cooling water is often put into use after shutdown. Based on the calculation that each unit operates 400 hours per year under this condition, the power plant can reduce electricity consumption by about 120,000 kWh per year, which is a considerable benefit.

[0042] like Figure 1 As shown, optionally, the number of the second water pumps 220 is at least two, and each second water pump 220 is installed in parallel on the second water supply pipe 240 .

[0043] like Figure 1 As shown, optionally, the number of the second heat exchangers 230 is at least two, and each second heat exchanger 230 is installed in parallel on the second water supply pipe 240 .

[0044] Specifically in this embodiment, there are two second water pumps 220, one of which is used for operation and the other is used for standby. There are two second heat exchangers 230, one of which is used for operation and the other is used for standby. In this way, the reliability of the auxiliary machine cooling water system 10 is improved.

[0045] like Figure 1 As shown, in one embodiment, the first water tank 110 is located above the first water pump 120. In this way, the first water tank 110 is arranged at a high position to stabilize the pressure of the first cooling module 100, eliminate flow fluctuations and thermal expansion of absorbed water, and provide the first water pump 120 with sufficient net positive suction head, thereby improving the stability and reliability of the auxiliary machine cooling water system 10.

[0046] like Figure 1 As shown, optionally, the second water tank 210 is located above the second water pump 220. In this way, the second water tank 210 is arranged at a high position to stabilize the pressure of the second cooling module 200, eliminate flow fluctuations and thermal expansion of absorbed water, and provide the second water pump 220 with sufficient net positive suction head, thereby improving the stability and reliability of the auxiliary machine cooling water system 10.

[0047] like Figure 1As shown, in one embodiment, a power plant is provided, including a first unit 20, a second unit 30 and the auxiliary machine cooling water system 10 in any of the above embodiments, the first unit 20 is connected to the first water supply pipe 140 and the first return pipe 150 respectively, and the second unit 30 is connected to the second water supply pipe 240 and the second return pipe 250 respectively.

[0048] In the power plant in the above embodiment, when the first unit 20 is running and the second unit 30 is shut down, the second water pump 220 stops running, the first control valve 320 and the second control valve 420 are both opened, so that the first cooling module 100 is interconnected with the second cooling module 200, and the first water pump 120 can supply cooling water to the second equipment to be cooled 31 in the second unit 30 through the first water supply pipe 140, the first connecting pipe 310 and the second water supply pipe 240. Since the demand for cooling water after the second unit 30 is shut down is small, the interconnected first cooling module 100 can simultaneously meet the demand for cooling water of the first unit 20 and the second unit 30. When the first unit 20 is shut down and the second unit 30 is running, its working principle is similar to the above, and will not be described in detail here. The auxiliary machine cooling water system 10 in the present application can shut down one of the first unit 20 and the second unit 30 while the other one is running, and correspondingly shut down one of the first water pump 120 and the second water pump 220, and supply cooling water through the other one of the first water pump 120 and the second water pump 220, so as to simultaneously meet the cooling water needs of the first unit 20 and the second unit 30, reduce the operating power consumption of the auxiliary machine cooling water system 10, and achieve the effect of energy saving and consumption reduction.

[0049] like Figure 1 As shown, optionally, the first unit 20 includes at least one first device to be cooled 21, each of which is arranged in parallel, and the water inlet of each of which is connected to one end of the first water supply pipe 140 away from the first water tank 110, and the water outlet of each of which is connected to one end of the first water return pipe 150 away from the first water tank 110. The second unit 30 includes at least one second device to be cooled 31, each of which is arranged in parallel, and the water inlet of each of which is connected to one end of the second water supply pipe 240 away from the second water tank 210, and the water outlet of each of which is connected to one end of the second water return pipe 250 away from the second water tank 210.

[0050] Optionally, there is at least one first unit 20 and at least one second unit 30. The number of the first cooling modules 100 is the same as the number of the first units 20, and each first unit 20 is connected to each first cooling module 100. The number of the second cooling modules 200 is the same as the number of the second units 30, and each second unit 30 is connected to each second cooling module 200. Each first cooling module 100 is connected to at least one of all the second cooling modules 200 through the first communication pipe 310 and the second communication pipe 410. Each second cooling module 200 is connected to at least one of all the first cooling modules 100 through the first communication pipe 310 and the second communication pipe 410. A first control valve 320 is installed on each first communication pipe 310. A second control valve 420 is installed on each second communication pipe 410.

[0051] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0052] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0054] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0056] It should also be understood that when explaining the connection relationship or positional relationship of elements, although not explicitly described, the connection relationship and positional relationship are interpreted as including an error range, which should be within the acceptable deviation range of a specific value determined by those skilled in the art. For example, "approximately", "approximately" or "substantially" may mean within one or more standard deviations, which are not limited here.

[0057] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An auxiliary machine cooling water system, applied to a power plant, the power plant comprising a first unit and a second unit, characterized in that: The auxiliary machine cooling water system comprises: A first cooling module, the first cooling module comprising a first water tank, a first water pump, a first heat exchanger, a first water supply pipe and a first water return pipe, the first water tank is connected to one end of the first water supply pipe and one end of the first water return pipe, the first water pump and the first heat exchanger are both installed on the first water supply pipe, the other end of the first water supply pipe is connected to the water inlet of the first device to be cooled in the first unit, and the other end of the first water return pipe is connected to the water outlet of the first device to be cooled; a second cooling module, the second cooling module comprising a second water tank, a second water pump, a second heat exchanger, a second water supply pipe and a second water return pipe, the second water tank and one end of the second water supply pipe and one end of the second water return pipe, the second water pump and the second heat exchanger are both installed on the second water supply pipe, the other end of the second water supply pipe is connected to the water inlet of the second device to be cooled in the second unit, and the other end of the second water return pipe is connected to the water outlet of the second device to be cooled; a first communication pipe and a first control valve, wherein one end of the first communication pipe is connected to an end of the first water supply pipe away from the first water tank, and the other end is connected to an end of the second water supply pipe away from the second water tank, and the first control valve is installed on the first communication pipe; A second connecting pipe and a second control valve, one end of the second connecting pipe is connected to an end of the first return pipe away from the first water tank, and the other end is connected to an end of the second return pipe away from the second water tank, and the second control valve is installed on the second connecting pipe.

2. The auxiliary machine cooling water system according to claim 1, characterized in that: The first cooling module also includes a third water pump, which is installed on the first water supply pipe and is arranged in parallel with the first water pump. The motor power of the third water pump is smaller than the motor power of the first water pump.

3. The auxiliary machine cooling water system according to claim 2, characterized in that: The motor power of the first water pump is 300kW, the pump flow rate of the first water pump is 1800t / h, and the voltage level of the first water pump is 6kV; the motor power of the third water pump is 30kW, the pump flow rate of the third water pump is 250t / h, and the voltage level of the third water pump is 380V.

4. The auxiliary machine cooling water system according to claim 1, characterized in that: The number of the first water pumps is at least two, and each of the first water pumps is installed in parallel on the first water supply pipe.

5. The auxiliary machine cooling water system according to claim 1, characterized in that: The number of the first heat exchangers is at least two, and each of the first heat exchangers is installed in parallel on the first water supply pipe.

6. The auxiliary machine cooling water system according to any one of claims 1 to 5, characterized in that: The second cooling module also includes a fourth water pump, which is installed on the second water supply pipe and is arranged in parallel with the second water pump. The power of the fourth water pump is smaller than that of the second water pump.

7. The auxiliary machine cooling water system according to claim 6, characterized in that: The number of the second water pumps is at least two, and each of the second water pumps is installed in parallel on the second water supply pipe.

8. The auxiliary machine cooling water system according to claim 6, characterized in that: The number of the second heat exchangers is at least two, and each of the second heat exchangers is installed in parallel on the second water supply pipe.

9. The auxiliary machine cooling water system according to any one of claims 1 to 5, characterized in that: The first water tank is located above the first water pump; And / or, the second water tank is located above the second water pump.

10. A power plant, characterized in that: It comprises a first unit, a second unit and an auxiliary machine cooling water system as described in any one of claims 1 to 9, wherein the first unit is connected to the first water supply pipe and the first water return pipe respectively, and the second unit is connected to the second water supply pipe and the second water return pipe respectively.

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