CN112954974B - Working method of high-voltage frequency converter spray cooling system - Google Patents
Working method of high-voltage frequency converter spray cooling system Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20927—Liquid coolant without phase change
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
- H05K7/20254—Cold plates transferring heat from heat source to coolant
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
- H05K7/20272—Accessories for moving fluid, for expanding fluid, for connecting fluid conduits, for distributing fluid, for removing gas or for preventing leakage, e.g. pumps, tanks or manifolds
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20945—Thermal management, e.g. inverter temperature control
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Abstract
The invention relates to a spray cooling system and a spray cooling method for a high-voltage frequency converter, which can be used for solving the heat dissipation problem of the high-voltage frequency converter matched with an induced draft fan, a water pump and the like. The system device mainly guides cooling water to enter the air cooling device through a process pipeline by configuring corresponding auxiliary process equipment, and frequency converter radiating air returns to the frequency converter chamber after completing heat exchange with the cooling water in the air cooling device. The cooling water after heat exchange expands the cooling area to finish cooling under the action of a spraying system through a process pipeline. Compared with a high-power frequency converter adopting other heat dissipation modes, the improved system device and method have the advantages of energy consumption saving, economy, reliability and the like.
Description
Technical Field
The invention belongs to the field of cooling of high-voltage frequency converters, and particularly relates to a spraying cooling system and a spraying cooling method for a high-voltage frequency converter, which are suitable for solving the problem of heat dissipation of the high-voltage frequency converter, particularly a high-power high-voltage frequency converter, in operation.
Background
The cooling scheme of the high-voltage frequency converter has certain heat loss in the operation process of the frequency converter body, generally about 4% of the capacity of the frequency converter body, and the power consumption is changed into heat and becomes one of important factors influencing the reliability of the high-voltage frequency converter. In order to ensure that the frequency converter has a good operating environment, an independent cooling system needs to be equipped for the frequency converter chamber. Currently, there are three cooling system solutions in common use: air conditioner cooling, fan cooling, air cooling device.
When the air conditioner is used for cooling, the too large building area of a room can increase the cooling load of the air conditioner. Meanwhile, hot air exhausted by the frequency converter cannot be sucked and cooled by the air conditioner completely, so that the system operation efficiency is low, and secondary waste of energy conservation is caused;
the heat dissipation holes of the fan cooling heat dissipation structure are simple through hole structures, the heat dissipation holes need to be continuously opened, and in some occasions with severe external environments, such as steel factories and other occasions where sundries like steel slag, dust and the like easily enter the high-voltage frequency converter shell, so that the use performance of the high-voltage frequency converter is reduced; the service life of the high-voltage frequency converter is also shortened.
The conventional air cooling device directly carries out heat exchange on hot air of the frequency converter through the air duct through the air cooling device, the heat dissipated by the frequency converter is directly taken away by cooling water, and cold air after cooling is discharged back to the room. The temperature can be reduced due to small heat productivity in some low-voltage small-capacity frequency converter devices, and the heat exchange effect is poor due to large heat dissipation and high temperature in some high-voltage high-power frequency converter devices, so that the expected temperature reduction effect cannot be achieved.
Under the condition, the invention provides a device and a method for a spray cooling system of a high-voltage frequency converter. The feedback operation is stable after being used for a site, the heat dissipation effect of the high-voltage frequency converter is good, and the indoor good operation environment of the high-voltage frequency converter is ensured. And the cooling water is completely separated from the circulating air, and the water pipeline is clearly separated from the high-voltage equipment outside the frequency conversion chamber, so that the high-voltage equipment chamber is prevented from safety threats and accidents such as water resistance, insulation damage and the like, and the high-voltage equipment chamber is low in operation, economical and reliable.
Disclosure of Invention
The invention aims to solve the defects in the prior heat dissipation technology of a high-voltage frequency converter, particularly a high-power high-voltage frequency converter and reduce the operation cost, and provides a device and a method of a spray cooling system of the high-voltage frequency converter.
The scheme of the invention is as follows:
the invention provides a spray cooling system of a high-voltage frequency converter, which comprises a spray cooling water tank, a process pipeline, a variable-frequency water pump, a plate heat exchanger and an air cooling device, wherein the spray cooling water tank is connected with the process pipeline; the spraying cooling water tank is internally provided with a spraying device, the top of the spraying cooling water tank is provided with two axial flow fans, and the top of the spraying cooling water tank is provided with a rainproof shed;
the inlet end of the process pipeline is communicated with the bottom of the spray cooling water tank, and the outlet end of the process pipeline is connected with a spray device and returns to the spray cooling water tank; the process pipeline is sequentially provided with a filter screen, a stop valve, a hot water side of the plate heat exchanger, a first temperature instrument, a variable frequency water pump, an air cooling device, a second temperature instrument and a pressure instrument according to the medium flowing direction, wherein the second temperature instrument and the pressure instrument are used for detecting the temperature and the pressure of the outlet end of the process pipeline;
the process pipeline is externally connected with a discharge pipeline at a pipe section between the outlet of the plate heat exchanger and the inlet of the variable frequency water pump, wherein a stop valve is arranged on the discharge pipeline, and discharge is realized through the stop valve;
the side wall of the spray cooling water tank is also connected with a process water pipeline, the process water pipeline is divided into two paths, one path is provided with a water replenishing electric valve and directly enters the spray cooling water tank, and the other path passes through an electric valve at the inlet of the plate heat exchanger and then returns to the process water tank of the whole plant through the cold water side of the plate heat exchanger.
As a preferred scheme of the invention, the high-voltage frequency converter spray cooling system further comprises a control system, wherein an input port of the control system respectively collects liquid level information and air cooling device temperature information in the spray cooling water tank and signals of the first temperature instrument, the second temperature instrument and the pressure instrument; the control system respectively controls the stop valve, the variable frequency water pump, the plate heat exchanger inlet electric valve, the water replenishing electric valve and the two axial flow fans;
when the water level in the spray cooling water tank is low, controlling to open a water replenishing electric valve and close an inlet valve of the plate heat exchanger to replenish water; when the water level reaches a design value, automatically outputting a signal to close the water replenishing electric valve, and simultaneously opening an inlet valve of the plate heat exchanger to start the heat exchanger;
the control system collects the outlet temperature of the air cooling exchange device, when the temperature is high, the control system raises the operating frequency of the variable frequency water pump to accelerate the exchange of cooling water, and when the temperature is low, the operating frequency of the variable frequency water pump is lowered; and meanwhile, the control system controls the start and stop of the axial flow fan according to the temperature condition, and stops running the axial flow fan when the temperature detected by the second temperature instrument is lower than a set value.
The invention also discloses a working method of the spraying cooling system of the high-voltage frequency converter, which comprises the following steps:
opening an inlet process water pipeline valve and an inlet electric valve of the plate heat exchanger, closing an outer discharge process water pipeline valve and a water replenishing electric valve, and filtering sundries in the cooling water sprayed in the cooling water tank through a filter screen to enter a process pipeline; under the action of the pumping force of the variable-frequency water pump, the process water entering the plate heat exchanger exchanges heat with the process water on the cold water side to realize cooling, the cooling water after heat exchange passes through the variable-frequency water pump, is pressurized by the water pump and then enters the air cooling device through the process pipeline to exchange heat with the heat emitted by the frequency converter, and the process water on the cold water side returns to the process water tank of the whole plant; after the heat exchange is finished, the process water flows out of the air cooling device and enters the spray cooling water tank through the process pipeline for spray cooling, the heat dissipated inside the spray cooling water tank is positioned above the spray device, one axial flow fan blows external cold air into the spray cooling water tank, and the other axial flow fan sucks hot air out of the spray cooling water tank;
when the water level in the spray cooling water tank is lower than a set value, a water supplementing electric valve is opened to supplement water; when the temperature of the air cooling device is still high after heat exchange, increasing the operating frequency of the variable frequency water pump to accelerate heat exchange, and reducing the operating frequency to realize electric energy saving when the temperature is low;
close the stop valve of inlet pipe way during the maintenance, when needing to discharge remaining cooling water in the technology pipeline, open outer row pipeline valve and arrange cooling water to trench, when plate heat exchanger need be overhauld, close plate heat exchanger inlet valve and overhaul. Compared with the prior art, the system disclosed by the invention has the advantages that the heat dissipation capacity of the cooling water is enhanced through the arrangement of the plate heat exchanger, the variable-frequency water pump, the axial flow fan and the spraying device, so that the temperature of the cooling water can be controlled within a larger temperature range, more allowance is provided for cooling of the air cooling device, and the cooling system can be controlled according to the required hot capability. The system device is provided with a control system for monitoring and data acquisition, when the water level in the spray cooling water tank is low, an electric loop is controlled to open a water replenishing electric valve for water replenishing, and when the water level reaches a design value, a signal is automatically output to close the water replenishing electric valve; similarly, by collecting the outlet temperature of the air cooling exchange device, when the temperature is high, the control system raises the operating frequency of the variable frequency water pump to accelerate the exchange of cooling water, and when the temperature is low, the operating frequency of the variable frequency water pump is lowered, so that the purpose of saving electric energy is achieved. Meanwhile, the axial flow fan can be started and stopped according to the temperature. Compared with a high-power frequency converter adopting other heat dissipation modes, the improved system device and method have the advantages of energy consumption saving, economy, reliability and the like.
Drawings
Fig. 1 is a diagram of a spray cooling system of a high-voltage inverter and a method thereof according to the present invention.
Fig. 2 is a schematic view of a usage scenario of the spray cooling system device according to the present invention.
Fig. 3 is a schematic diagram of an embodiment of the control scheme of the spray cooling system device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, in the present invention, unless otherwise explicitly specified or limited, the term "connected" and the like are to be interpreted broadly, and for example, "connected" may be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection, physical connection or wireless communication connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1, the high-voltage inverter spray cooling system of the present embodiment includes a spray cooling water tank 1, a process pipeline 4, a variable frequency water pump 12, a plate heat exchanger 9, and an air cooling device 13; the spraying device 14 is arranged in the spraying cooling water tank, the top of the spraying cooling water tank is provided with two axial flow fans 17/18, and the top of the spraying cooling water tank is provided with a rain-proof shed 19;
the inlet end of the process pipeline 4 is communicated with the bottom of the spray cooling water tank, and the outlet end of the process pipeline is connected with a spray device 14 and returns to the spray cooling water tank; the process pipeline is sequentially provided with a filter screen 2, a stop valve 3, a hot water side of a plate heat exchanger 9, a first temperature instrument 10, a variable frequency water pump 12, an air cooling device 13, a second temperature instrument 16 and a pressure instrument 15 according to the flowing direction of a medium, wherein the second temperature instrument 16 and the pressure instrument 15 are used for detecting the temperature and the pressure of the outlet end of the process pipeline;
the process pipeline is externally connected with a discharge pipeline 11 at a pipe section between the outlet of the plate heat exchanger and the inlet of the variable frequency water pump, wherein a stop valve is arranged on the discharge pipeline, and discharge is realized through the stop valve;
the side wall of the spray cooling water tank 1 is also connected with a process water pipeline 6, the process water pipeline is divided into two paths, one path is provided with a water supplementing electric valve 7 and directly enters the spray cooling water tank, and the other path passes through an electric valve 5 at the inlet of the plate heat exchanger and then returns to the process water tank of the whole plant through the cold water side of the plate heat exchanger.
When the device is used, the inlet process water pipeline valve and the plate heat exchanger inlet electric valve are opened, the outer discharge process water pipeline valve and the water replenishing electric valve are closed, and cooling water in the spray cooling water tank enters the process pipeline after impurities are filtered by the filter screen; under the action of the pumping force of the variable-frequency water pump, the process water entering the plate heat exchanger exchanges heat with the process water on the cold water side to realize cooling, the cooling water after heat exchange passes through the variable-frequency water pump, is pressurized by the water pump and then enters the air cooling device through the process pipeline to exchange heat with the heat emitted by the frequency converter, and the process water on the cold water side returns to the process water tank of the whole plant; after the heat exchange is finished, the process water flows out of the air cooling device and enters the spray cooling water tank through the process pipeline for spray cooling, the heat dissipated inside the spray cooling water tank is positioned above the spray device, one axial flow fan blows external cold air into the spray cooling water tank, and the other axial flow fan sucks hot air out of the spray cooling water tank;
when the water level in the spray cooling water tank is lower than a set value, a water supplementing electric valve is opened to supplement water; when the outlet temperature of the air cooling device is higher after heat exchange, the operating frequency of the variable frequency water pump is increased to accelerate heat exchange, and when the temperature is lower, the operating frequency is reduced to save electric energy;
close the stop valve of inlet pipe way during the maintenance, when needing to discharge remaining cooling water in the technology pipeline, open outer row pipeline valve and arrange cooling water to trench, when plate heat exchanger need be overhauld, close plate heat exchanger inlet valve and overhaul.
As a preferable scheme of the present invention, the spray cooling water tank device body is provided with a cooling water tank liquid level measuring instrument for monitoring a liquid level height in the water tank.
In a preferred embodiment of the present invention, the spray cooling water tank device is provided with a water replenishing pipeline, and the process water pipeline 6 is used for replenishing water to the spray cooling water tank by closing the electric valve 5 of the plate heat exchanger port and opening the electric valve 7 for replenishing water.
As a preferable scheme of the present invention, the spraying device 14 is arranged at the inner top of the spraying cooling water tank device body, and cooling water is returned to the water tank through the spraying device 14 to increase the contact area between water and air, so as to accelerate cooling.
As a preferable scheme of the invention, two axial flow fans 17/18 are arranged at the top of the spray cooling water tank device body; the two axial flow fans are opposite in rotating direction, one axial flow fan rotates forwards for air supply, and the other axial flow fan rotates reversely for air draft to achieve air pressure dynamic balance.
As a preferable aspect of the present invention, a rain-proof ceiling 19 is mounted on the top of the spray cooling water tank device body to protect the axial flow fan from rain.
As a preferred scheme of the invention, the inlet of the variable frequency water pump is taken from the outlet of the plate heat exchanger, the outlet of the variable frequency water pump is connected to an outdoor frequency converter air cooling device, and the variable frequency water pump is used for realizing the down-conversion operation under different working conditions.
Fig. 2 is a schematic view of a usage scenario of the cooling system apparatus according to the present invention. The high-voltage inverter is installed indoors, the complete high-voltage inverter comprises a frequency converter cabinet, a power unit cabinet and a control cabinet, heating is mainly from the frequency converter cabinet and the power unit cabinet, a main heating device in the frequency converter cabinet is a transformer winding coil, and a power unit heating component is an IGBT (insulated gate bipolar transistor) in the frequency converter cabinet. The top parts of the two cabinets are provided with outer exhaust fans, heat in the cabinets is sucked out through the outer exhaust fans, and meanwhile, the top parts of the cabinets are provided with air exhaust channels. The exhaust fan exhausts the heat dissipated by the two cabinets to an outdoor air cooling device through an exhaust air duct. The cold water with the temperature lower than 30 ℃ flows in the air cooling device, the temperature is lower than the hot air temperature of the frequency converter, the hot air is subjected to heat exchange through the radiating fins of the air cooling device by enlarging the contact area between the hot air and the cooling water pipe, and the cold air with the temperature lower than 40 ℃ after exchange and cooling returns to the frequency conversion chamber again through the grid net, so that the dynamic balance of the air pressure is realized. Thereby, the indoor good operational environment of converter has been guaranteed. The cooling water is completely separated from the circulating air, the water pipeline is separated from the high-voltage equipment outside the frequency conversion chamber, and the high-voltage frequency conversion chamber cannot be subjected to safety threats and accidents such as insulation damage and the like.
In a preferred embodiment of the present invention, as shown in fig. 3, a schematic diagram is implemented for the control scheme of the cooling system of the invention. The high-voltage frequency converter spray cooling system also comprises a control system, wherein an input port of the control system respectively collects liquid level information and air cooling device temperature information in the spray cooling water tank device and signals of the first temperature instrument 10, the second temperature instrument 16 and the pressure instrument 15; the control system respectively controls the variable frequency water pump 12, the plate heat exchanger inlet electric valve 5, the water supplementing electric valve 7 and the two axial flow fans; the control system is used as an important component of the device and the using method thereof, and is not only responsible for data acquisition of the liquid level, the temperature, the pressure, the water pump running frequency, the opening and closing states of all valves and the like of the system, but also carries out analysis and program execution control according to the acquired data.
The control system is used for monitoring the liquid level and collecting the liquid level, when the water level in the spray cooling water tank is low, the control system program is executed, the electric loop is controlled to open the water supplementing electric valve and close the inlet valve of the plate heat exchanger, and the water supplementing side water pressure is high to flow into the cooling water tank for supplementing water. And when the water level reaches a design value, automatically outputting a signal to close the water replenishing electric valve, and simultaneously opening an inlet valve of the plate heat exchanger to start the heat exchanger. Similarly, by collecting the outlet temperature of the air cooling exchange device, when the temperature is high, the control system executes a program to increase the operating frequency of the variable frequency water pump, so that the cooling water is exchanged at an accelerated speed, and when the temperature is low, the operating frequency of the variable frequency water pump is reduced, so that the automatic adjustment is realized, the workload of personnel intervention is reduced, and the purpose of saving electric energy can be achieved. Meanwhile, the start and stop of the axial flow fan can be controlled by executing a control system program according to the temperature, and the axial flow fan is stopped when the set temperature is lower.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A working method of a high-voltage frequency converter spray cooling system comprises a spray cooling water tank (1), a process pipeline (4), a variable-frequency water pump (12), a plate heat exchanger (9) and an air cooling device (13); a spraying device (14) is arranged in the spraying cooling water tank, two axial flow fans (17/18) are arranged at the top of the spraying cooling water tank, and a rainproof shed (19) is arranged at the top of the spraying cooling water tank;
the inlet end of the process pipeline (4) is communicated with the bottom of the spray cooling water tank, and the outlet end of the process pipeline is connected with a spray device (14) and returns to the spray cooling water tank; the process pipeline is sequentially provided with a filter screen (2), a stop valve (3), a plate heat exchanger (9) hot water side, a first temperature instrument (10), a variable frequency water pump (12), an air cooling device (13), a second temperature instrument (16) and a pressure instrument (15) according to the medium flowing direction, wherein the second temperature instrument (16) and the pressure instrument (15) are used for detecting the temperature and the pressure of the outlet end of the process pipeline;
the process pipeline is externally connected with a discharge pipeline (11) at a pipe section between the outlet of the plate heat exchanger and the inlet of the variable frequency water pump, wherein a stop valve is arranged on the discharge pipeline, and discharge is realized through the stop valve;
the side wall of the spray cooling water tank (1) is also connected with a process water pipeline (6), the process water pipeline is divided into two paths, one path is provided with a water supplementing electric valve (7) and directly enters the spray cooling water tank, and the other path passes through an electric valve (5) at the inlet of the plate heat exchanger and then returns to the process water tank of the whole plant through the cold water side of the plate heat exchanger;
the working method is characterized by comprising the following steps:
opening an inlet process water pipeline valve and an inlet electric valve (5) of the plate heat exchanger, closing an outer discharge process water pipeline valve and a water replenishing electric valve, and filtering sundries in cooling water sprayed in a cooling water tank (1) through a filter screen (2) and then entering the process pipeline; under the action of the pumping force of the variable-frequency water pump, the process water entering the plate heat exchanger (9) exchanges heat with the process water on the cold water side to realize cooling, the cooling water after heat exchange passes through the variable-frequency water pump, is pressurized by the water pump and then enters the air cooling device through the process pipeline to exchange heat with the heat emitted by the frequency converter, and the process water on the cold water side returns to the process water tank of the whole plant; after the heat exchange is finished, the process water flows out of the air cooling device and enters the spray cooling water tank through the process pipeline for spray cooling, the heat dissipated inside the spray cooling water tank is positioned above the spray device, one axial flow fan blows external cold air into the spray cooling water tank, and the other axial flow fan sucks hot air out of the spray cooling water tank; controlling the start and stop of the axial flow fan according to the temperature condition, and stopping running the axial flow fan when the temperature detected by the second temperature instrument is lower than a set value;
when the water level in the spray cooling water tank is lower than a set value, a water supplementing electric valve is opened to supplement water; when the outlet temperature of the air cooling device is higher after heat exchange, the operating frequency of the variable frequency water pump is increased to accelerate heat exchange, and when the temperature is lower, the operating frequency is reduced to save electric energy;
close the stop valve of inlet pipe way during the maintenance, when need be with the interior residual cooling water discharge of process line, open outer pipeline valve of arranging and arrange cooling water to trench, when plate heat exchanger need be overhauld, close plate heat exchanger inlet valve and overhaul.
2. The method of claim 1, wherein the spray cooling tank is fitted with a cooling tank level gauge for monitoring the level of liquid in the tank.
3. The working method according to claim 1, characterized in that the spray cooling water tank is provided with a water replenishing pipeline, and the process water pipeline (6) replenishes water to the spray cooling water tank by closing the electric valve (5) at the inlet of the plate heat exchanger and opening the electric valve (7) for replenishing water.
4. The working method according to claim 1, characterized in that the spraying device (14) is arranged at the inner top of the spraying cooling water tank, and cooling water returns to the water tank through the spraying device (14) to increase the contact area of water and air so as to accelerate cooling.
5. The operating method according to claim 1, characterized in that two axial fans (17/18) are installed on the top of the spray cooling water tank; the two axial flow fans are opposite in rotating direction, one axial flow fan rotates forwards for air supply, and the other axial flow fan rotates reversely for air draft to achieve air pressure dynamic balance.
6. The working method of claim 1, wherein the inlet of the variable-frequency water pump is taken from the outlet of the plate heat exchanger, the outlet of the variable-frequency water pump is connected to an outdoor air cooling device of the variable-frequency device, and the variable-frequency water pump is used for realizing the down-conversion operation under different working conditions.
7. The working method according to claim 1, characterized in that the high-voltage frequency converter spray cooling system further comprises a control system, and an input port of the control system respectively collects liquid level information and air cooling device temperature information in the spray cooling water tank and signals of the first temperature instrument (10), the second temperature instrument (16) and the pressure instrument (15); the control system respectively controls the variable frequency water pump (12), the plate heat exchanger inlet electric valve (5), the water supplementing electric valve (7) and the two axial flow fans;
when the water level in the spray cooling water tank is low, controlling to open a water replenishing electric valve and close an inlet valve of the plate heat exchanger to replenish water; when the water level reaches a design value, automatically outputting a signal to close the water replenishing electric valve, and simultaneously opening an inlet valve of the plate heat exchanger to start the heat exchanger;
the control system collects the outlet temperature of the air cooling exchange device, when the temperature is high, the control system raises the operating frequency of the variable frequency water pump to accelerate the exchange of cooling water, and when the temperature is low, the operating frequency of the variable frequency water pump is lowered; and meanwhile, the control system controls the start and stop of the axial flow fan according to the temperature condition, and stops running the axial flow fan when the temperature detected by the second temperature instrument is lower than a set value.
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