Flushing system for oil plate type heat exchanger and working method of flushing system

Abstract

The invention provides an oil plate type heat exchanger flushing system which comprises an oil plate type heat exchanger A and an oil plate type heat exchanger B which are correspondingly arranged in a power plant lubricating oil system, and cooling water inlets and cooling water outlets of the oil plate type heat exchanger A and the oil plate type heat exchanger B are connected into an open type water system. And cooling water inlets and cooling water outlets of the oil plate heat exchanger A and the oil plate heat exchanger B are connected into a washing system. The cooling device is reasonable in design, and solves the problems that open water is adopted as a cooling mode of a lubricating oil system of an existing power plant, so that mud and gravels enter a plate exchange flow channel, the plate exchange flow channel is blocked, the plate exchange heat exchange efficiency is reduced, the oil temperature is increased, and maintenance is frequent; one-standby and one-operation of the oil plate heat exchanger A and the oil plate heat exchanger B is achieved through opening and closing of the switch valve of the open water system, meanwhile, rapid washing of the oil plate heat exchangers after shutdown is achieved through the washing system, rapid reciprocating washing of the interiors of the oil plate heat exchangers is achieved, and the cleaning strength is high.

Description

Technical Field

[0001] This invention relates to a flushing system for an oil-plate heat exchanger and its operating method. Background Technology

[0002] The cooling method of the power plant's lubricating oil system is to use open-loop water in conjunction with plate heat exchangers. The open-loop water comes from the sewage treatment plant, which transports the water to the cooling tower. Since the cooling tower is open-air, debris, soil, and gravel can enter the open-loop water system. The open-loop water enters the plate heat exchanger through pipes, and the mud and gravel can enter the heat exchanger channels, clogging them, reducing the heat exchange efficiency, causing the oil temperature to rise, and leading to frequent maintenance problems. In addition, the construction period is long and the cost of replacing the gaskets of the heat exchanger is high. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to overcome the shortcomings of the prior art and provide an oil plate heat exchanger flushing system and its working method.

[0004] This invention is implemented using the following scheme: an oil plate heat exchanger flushing system, including an A oil plate heat exchanger and a B oil plate heat exchanger correspondingly installed in the power plant lubricating oil system, wherein the cooling water inlet and cooling water outlet of the A oil plate heat exchanger and the B oil plate heat exchanger are connected to an open water system, and the cooling water inlet and cooling water outlet of the A oil plate heat exchanger and the B oil plate heat exchanger are connected to a flushing system.

[0005] Furthermore, the open water system includes an open water inlet pipe and an open water outlet pipe. The output end of the open water inlet pipe is connected to the cooling water inlets of the A oil plate heat exchanger and the B oil plate heat exchanger via a parallel inlet pipe. The input end of the open water outlet pipe is connected to the cooling water outlet of the A oil plate heat exchanger and the B oil plate heat exchanger via a parallel outlet pipe.

[0006] Furthermore, the flushing system includes a water storage mechanism. The output end of the water storage mechanism is connected to a flushing pump via a pipeline. The output end of the flushing pump is connected to two branch pipes of the parallel outlet pipe via a first parallel flushing pipe. The water storage mechanism has a water return port corresponding to the A oil plate heat exchanger and the B oil plate heat exchanger. The cooling water inlets of the A oil plate heat exchanger and the B oil plate heat exchanger are connected to the corresponding water return ports of the water storage mechanism via the first return water pipeline.

[0007] Furthermore, each of the two branch pipes of the parallel water outlet pipeline is provided with a water outlet return port. The two water outlet return ports are respectively connected to the return port of the corresponding water storage mechanism via a second return water pipeline. The output end of the flushing pump is respectively connected to the first return water pipeline via a second parallel flushing pipeline.

[0008] Furthermore, each of the two branch pipes of the parallel water outlet pipe and the two branch pipes of the parallel water inlet pipe is equipped with a switch valve corresponding to the A oil plate heat exchanger and the B oil plate heat exchanger, respectively. The output end of the first parallel flushing pipe is located between the switch valve on the branch pipe of the parallel water outlet pipe and the cooling water outlet of the A oil plate heat exchanger or the B oil plate heat exchanger. Each of the two branch pipes of the first parallel flushing pipe is equipped with a switch valve. The water return port is located between the switch valve on the branch pipe of the parallel water outlet pipe and the cooling water outlet of the A oil plate heat exchanger or the B oil plate heat exchanger. A switch valve is installed on the second return water pipe.

[0009] Furthermore, the first return water pipeline is equipped with two switch valves connected in series along the pipeline direction, and the output end connection points of the two branch pipes of the second parallel flushing pipeline are located between the two switch valves on the corresponding first return water pipeline. Each of the two branch pipes of the second parallel flushing pipeline is equipped with a switch valve.

[0010] Furthermore, the water storage mechanism includes a flushing water tank, which is provided with a flushing outlet connected to a flushing pump. The water return port of the water storage mechanism is located on the flushing water tank, and several dosing tanks are connected to the flushing water tank via pipelines.

[0011] Furthermore, an oil temperature adjustment system is connected between the open water outlet pipe and the parallel outlet pipe. The oil temperature adjustment system includes several parallel cooling water drain pipes. The output end of each cooling water drain pipe is connected to the input end of the open water outlet pipe via a parallel connector, and the input end of each cooling water drain pipe is connected to the output end of the parallel outlet pipe via a parallel connector.

[0012] A method for operating a flushing system for an oil-plate heat exchanger: Two oil-plate heat exchangers, one on standby and one in operation. When one oil-plate heat exchanger is shut down for flushing, the other oil-plate heat exchanger is in operation. The flushing method alternates between forward flushing and backflushing. 1) The working method of forward flushing is as follows: the switch valves on the parallel inlet and outlet water pipes corresponding to the oil plate heat exchanger that needs to be flushed are closed, the switch valve on the first parallel flushing pipe is closed, the switch valve on the second parallel flushing pipe corresponding to the oil plate heat exchanger that needs to be flushed is opened, and the other switch valve is closed. The switch valve on the first return water pipe that is close to the oil plate heat exchanger is opened, and the switch valve that is far away from the oil plate heat exchanger is closed. The flushing pump draws flushing water from the water storage mechanism. The switch valve on the second return water pipe is opened, and the flushing pump draws flushing water from the water storage mechanism. The flushing water is input into the first return water pipe through one of the branch pipes of the second parallel flushing pipe, and then enters the cooling water inlet of the oil plate heat exchanger. Then it passes through the cooling water channel in the oil plate heat exchanger and is output from the cooling water outlet. After passing through part of the parallel outlet water pipe, it is sent back to the water storage mechanism by the second return water pipe. 2) The backwashing operation method is as follows: the switch valves on the parallel inlet and outlet water pipes corresponding to the oil plate heat exchanger that needs to be flushed are closed, the switch valve on the second parallel flushing pipe is closed, the switch valve on the first parallel flushing pipe corresponding to the oil plate heat exchanger that needs to be flushed is opened, and the other switch valve is closed. Both switch valves on the first return water pipe are opened, and the switch valve on the second return water pipe is closed. The flushing pump draws flushing water from the water storage mechanism. The flushing water enters the parallel outlet water pipe of one branch of the first parallel flushing pipe, then enters the cooling water outlet of the oil plate heat exchanger, then passes through the cooling water channel in the oil plate heat exchanger and is output from the cooling water inlet, and is sent back to the water storage mechanism through the first return water pipe.

[0013] Furthermore, the two oil-plate heat exchangers operate in a standby mode, where the valves on the parallel inlet and outlet water pipes corresponding to the operating oil-plate heat exchanger are open, while the valves on the parallel inlet and outlet water pipes corresponding to the standby oil-plate heat exchanger are closed.

[0014] Compared with the prior art, the present invention has the following advantages: It is reasonably designed and solves the problem that the existing power plant lubricating oil cooling method uses open water, which causes mud and gravel to enter the plate heat exchanger channel, block the plate heat exchanger channel, reduce the heat exchange efficiency of the plate heat exchanger, cause the oil temperature to rise, and require frequent maintenance. The open water system achieves the standby and operation of the A and B oil plate heat exchangers by opening and closing the switch valves. At the same time, the flushing system enables the rapid flushing of the oil plate heat exchangers after shutdown, realizing rapid reciprocating flushing inside the oil plate heat exchangers with strong cleaning power. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pipeline structure of the present invention; Figure 2 This is a schematic diagram of the forward flushing of the present invention (taking the A-plate heat exchanger as an example); Figure 3 This is a schematic diagram of the backflushing process of the present invention (taking an A-plate heat exchanger as an example). Figure 4 This is a schematic diagram of the operation of the two oil plate heat exchangers of the present invention, one in standby and one in operation (oil plate heat exchanger A is stopped, oil plate heat exchanger B is in operation).

[0016] In the diagram: 1-A Oil plate heat exchanger; 2-B Oil plate heat exchanger; 3-Cooling water inlet; 4-Cooling water outlet; 5-Open water system; 6-Flushing system; 7-Open water inlet pipe; 8-Open water outlet pipe; 9-Water storage mechanism; 10-Flushing pump; 11-First parallel flushing pipe; 12-Water storage mechanism return port; 13-First return water pipe; 14-Outlet return water port; 15-Second return water pipe; 16-Second parallel flushing pipe; 17-Switch valve; 18-Flushing water tank; 19-Dosing tank; 20-Oil temperature adjustment system; 21-Cooling water drain pipe; 22-Switch valve and flow meter; 23-Parallel inlet water pipe; 24-Parallel outlet water pipe. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] like Figure 1-4 As shown, a flushing system for an oil-plate heat exchanger includes an A-plate heat exchanger 1 and a B-plate heat exchanger 2 correspondingly installed in the power plant's lubricating oil system. The cooling water inlet 3 and cooling water outlet 4 of the A-plate heat exchanger and the B-plate heat exchanger are connected to an open water system 5. The cooling water inlet and cooling water outlet of the A-plate heat exchanger and the B-plate heat exchanger are connected to a flushing system 6. In use, the A-plate heat exchanger and the B-plate heat exchanger are kept in standby mode and in operation respectively by opening and closing the switch valve of the open water system. At the same time, the flushing system enables rapid flushing of the oil-plate heat exchanger after shutdown.

[0021] In this embodiment, to achieve a specific standby-operation mode, the open water system includes an open water inlet pipe 7 and an open water outlet pipe 8. The output end of the open water inlet pipe is connected to the cooling water inlets of oil plate heat exchanger A and oil plate heat exchanger B via a parallel inlet pipe 23. The input end of the open water outlet pipe is connected to the cooling water outlet of oil plate heat exchanger A and oil plate heat exchanger B via a parallel outlet pipe 24. Both the parallel inlet and parallel outlet pipes are tee pipes. During operation, the parallel inlet pipe has one inlet connected to the output end of the open water inlet pipe and two outlets connected to the cooling water inlets of oil plate heat exchanger A and oil plate heat exchanger B, respectively, to supply water to the open water inlet pipe. The parallel outlet pipe has two inlets connected to the cooling water outlets of oil plate heat exchanger A and oil plate heat exchanger B, respectively, and one outlet connected to the input end of the open water outlet pipe, to output cooling water.

[0022] In this embodiment, to achieve backflushing of the oil plate heat exchanger, the flushing system includes a water storage mechanism 9. The output end of the water storage mechanism is connected to a flushing pump 10 via a pipeline. The output end of the flushing pump is connected to two branch pipes of the parallel outlet pipe via a first parallel flushing pipe 11. The two branch pipes of the parallel outlet pipe refer to two branch pipes corresponding to the two inlets. The first parallel flushing pipe can be a tee pipe, with one inlet connected to the output end of the flushing pump and two outlets connected to the two branch pipes of the parallel outlet pipe. The water storage mechanism is provided with a water storage mechanism return port 12 corresponding to oil plate heat exchanger A and oil plate heat exchanger B. The cooling water inlets of oil plate heat exchanger A and oil plate heat exchanger B are connected to the corresponding water storage mechanism return ports via a first return water pipeline 13. That is, the backflushing water circuit operation mode is as follows: water storage mechanism, flushing pump, first parallel flushing pipe, parallel outlet pipe, oil plate heat exchanger, first return water pipeline, water storage mechanism.

[0023] In this embodiment, for the forward flushing of the oil plate heat exchanger, each of the two branch pipes of the parallel outlet water pipe is provided with an outlet return water port 14. The two outlet return water ports are respectively connected to the corresponding water storage mechanism return water port via a second return water pipe 15. The output end of the flushing pump is connected to the two first return water pipes via a second parallel flushing pipe 16. The second parallel flushing pipe can be a pipe with two input ends connected to the inlet of the first parallel flushing pipe and an output end connected to the corresponding first return water pipe, forming a four-way pipe. Alternatively, it can be a three-way pipe with one inlet connected to the output end of the flushing pump or the inlet of the first parallel flushing pipe and two outlets connected to the corresponding first return water pipe. That is, the forward flushing water circuit operation mode is as follows: water storage mechanism, flushing pump, second parallel flushing pipe, first return water pipe connection, oil plate heat exchanger, parallel outlet water pipe, second return water pipe, water storage mechanism.

[0024] In this embodiment, to specifically achieve forward and reverse flushing, the specific distribution of the switching valves is as follows: Switching valves 17 are respectively installed on the two branch pipes of the parallel outlet pipe and the two branch pipes of the parallel inlet pipe, corresponding to the A oil plate heat exchanger and the B oil plate heat exchanger. The two branch pipes of the parallel inlet pipe refer to the pipes corresponding to the two outlets. By opening and closing the switching valves on the two parallel outlet pipes and the two parallel inlet pipes, the switching between standby and operation and the isolation during maintenance flushing are achieved. The output end of the first parallel flushing pipe is located between the switching valve on the branch pipe of the parallel outlet pipe and the cooling water outlet of the A oil plate heat exchanger or the B oil plate heat exchanger. Each of the two branch pipes of the first parallel flushing pipe is equipped with a switch valve. The two branch pipes of the first parallel flushing pipe refer to the pipes corresponding to the two outlets. The water return port is located between the switch valve on the branch pipe of the parallel water outlet and the cooling water outlet of the A oil plate heat exchanger or the B oil plate heat exchanger. A switch valve is installed on the second return water pipe. Two switch valves are connected in series along the pipe direction on the first return water pipe. The output end connection point of the two branch pipes of the second parallel flushing pipe is located between the two switch valves on the corresponding first return water pipe. Each of the two branch pipes of the second parallel flushing pipe is equipped with a switch valve.

[0025] In this embodiment, to assist in cleaning, the water storage mechanism includes a flushing water tank 18, which is provided with a flushing outlet connected to a flushing pump. The water return port of the water storage mechanism is located on the flushing water tank. Several dosing tanks 19 are connected to the flushing water tank via pipelines. The dosing tanks can add acidic, alkaline, or other types of desalination cleaning agents to the flushing water tank to facilitate cleaning.

[0026] In this embodiment, in order to control the heat exchange efficiency, an oil temperature adjustment system 20 is connected between the open water outlet pipe and the parallel outlet pipe. The oil temperature adjustment system includes several parallel cooling water drain pipes 21. The output end of each cooling water drain pipe is connected to the input end of the open water outlet pipe via a parallel connector, and the input end of each cooling water drain pipe is connected to the output end of the parallel outlet pipe via a parallel connector. The cooling water drain pipe is equipped with an adjustable opening switch valve and a flow meter 22. The magnitude of the flow rate and the amount of water flow are used to control the heat exchange efficiency.

[0027] A method for operating a flushing system for an oil-plate heat exchanger: Two oil-plate heat exchangers, one on standby and one in operation. When one oil-plate heat exchanger is shut down for flushing, the other oil-plate heat exchanger is in operation. The flushing method alternates between forward flushing and backflushing. 1) The working method of forward flushing is as follows: the switch valves on the parallel inlet and outlet water pipes corresponding to the oil plate heat exchanger that needs to be flushed are closed, the switch valve on the first parallel flushing pipe is closed, the switch valve on the second parallel flushing pipe corresponding to the oil plate heat exchanger that needs to be flushed is opened, and the other switch valve is closed. The switch valve on the first return water pipe that is close to the oil plate heat exchanger is opened, and the switch valve that is far away from the oil plate heat exchanger is closed. The flushing pump draws flushing water from the water storage mechanism. The switch valve on the second return water pipe is opened, and the flushing pump draws flushing water from the water storage mechanism. The flushing water is input into the first return water pipe through one of the branch pipes of the second parallel flushing pipe, and then enters the cooling water inlet of the oil plate heat exchanger. Then it passes through the cooling water channel in the oil plate heat exchanger and is output from the cooling water outlet. After passing through part of the parallel outlet water pipe, it is sent back to the water storage mechanism by the second return water pipe. 2) The backwashing operation method is as follows: the switch valves on the parallel inlet and outlet water pipes corresponding to the oil plate heat exchanger that needs to be flushed are closed, the switch valve on the second parallel flushing pipe is closed, the switch valve on the first parallel flushing pipe corresponding to the oil plate heat exchanger that needs to be flushed is opened, and the other switch valve is closed. Both switch valves on the first return water pipe are opened, and the switch valve on the second return water pipe is closed. The flushing pump draws flushing water from the water storage mechanism. The flushing water enters the parallel outlet water pipe of one branch of the first parallel flushing pipe, then enters the cooling water outlet of the oil plate heat exchanger, then passes through the cooling water channel in the oil plate heat exchanger and is output from the cooling water inlet, and is sent back to the water storage mechanism through the first return water pipe.

[0028] In this embodiment, the two oil plate heat exchangers operate in a standby mode, where the valves on the parallel inlet and outlet water pipes corresponding to the operating oil plate heat exchanger are open, while the valves on the parallel inlet and outlet water pipes corresponding to the standby oil plate heat exchanger are closed.

[0029] Unless otherwise stated, if any of the technical solutions disclosed in this invention specify a numerical range, then the disclosed numerical range is a preferred numerical range. Anyone skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this invention discloses only some numerical values ​​to illustrate the technical solutions of this invention. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this invention.

[0030] If the terms "first" or "second" are used in this document to specify components, those skilled in the art should know that the use of "first" or "second" is merely for the purpose of distinguishing components in description, and unless otherwise stated, the above terms have no special meaning.

[0031] If this invention discloses or relates to mutually fixedly connected components or structural parts, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0032] Furthermore, the orientations or positional relationships used in any of the technical solutions disclosed in this invention above to indicate positional relationships, such as "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this patent. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent. In addition, unless otherwise stated, the terms used to indicate shape in any of the technical solutions disclosed in this invention above include shapes that are similar to, close to, or approximate with it.

[0033] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. An oil plate heat exchanger flushing system, comprising A oil plate heat exchanger and B oil plate heat exchanger arranged in a power plant lubricating oil system, the cooling water inlet and outlet of the A oil plate heat exchanger and B oil plate heat exchanger are connected to an open water system, characterized in that: The cooling water inlets and outlets of the A oil plate heat exchanger and the B oil plate heat exchanger are connected to a flushing system.

2. The oil plate heat exchanger flushing system according to claim 1, characterized in that: The open water system comprises an open water inlet pipe and an open water outlet pipe, the output end of the open water inlet pipe is connected to the cooling water inlets of the A oil plate heat exchanger and the B oil plate heat exchanger through a parallel inlet pipe, and the input end of the open water outlet pipe is connected to the cooling water outlets of the A oil plate heat exchanger and the B oil plate heat exchanger through a parallel outlet pipe.

3. An oil plate heat exchanger flushing system according to claim 2, characterized in that: The flushing system comprises a water storage mechanism, the output end of the water storage mechanism is connected to a flushing pump through a pipeline, the output end of the flushing pump is connected to two branch pipes of the parallel outlet pipe through a first parallel flushing pipe, and the water storage mechanism has a water return port corresponding to the A oil plate heat exchanger and the B oil plate heat exchanger, respectively.

4. The oil plate heat exchanger flushing system of claim 3, wherein: The two branch pipes of the parallel outlet pipe are provided with water outlet return ports, and the two water outlet return ports are connected to the corresponding water storage mechanism return ports through a second return pipe, and the output end of the flushing pump is connected to the first return pipe through a second parallel flushing pipe.

5. An oil plate heat exchanger flushing system according to claim 4, characterized in that: The two branch pipes of the parallel outlet pipe and the two branch pipes of the parallel inlet pipe are respectively provided with on-off valves corresponding to the A oil plate heat exchanger and the B oil plate heat exchanger, the output end of the first parallel flushing pipe is located between the on-off valve on the branch pipe of the parallel outlet pipe and the cooling water outlet of the A oil plate heat exchanger or the B oil plate heat exchanger, the two branch pipes of the first parallel flushing pipe are provided with on-off valves, the on-off valve on the branch pipe of the parallel outlet pipe is located between the water outlet return port and the cooling water outlet of the A oil plate heat exchanger or the B oil plate heat exchanger, and the second return pipe is provided with an on-off valve.

6. An oil plate heat exchanger flushing system according to claim 5, characterized in that: The first return pipe is provided with two on-off valves arranged in series along the pipeline direction, the output end connection points of the two branch pipes of the second parallel flushing pipe are located between the two on-off valves on the corresponding first return pipe, and the two branch pipes of the second parallel flushing pipe are provided with on-off valves.

7. An oil plate heat exchanger flushing system according to claim 6, characterized in that: The water storage mechanism comprises a flushing water tank, the flushing water tank is provided with a flushing outlet connected to the flushing pump, the water storage mechanism return port is arranged on the flushing water tank, and the flushing water tank is connected to a plurality of dosing tanks through a pipeline.

8. An oil plate heat exchanger flushing system according to claim 6, characterized in that: The oil temperature adjustment system is connected between the open water outlet pipe and the parallel outlet pipe, and the oil temperature adjustment system comprises a plurality of parallel cooling water drainage pipes, the output end of each cooling water drainage pipe is connected to the input end of the open water outlet pipe through a parallel connector, and the input end of each cooling water drainage pipe is connected to the output end of the parallel outlet pipe through a parallel connector.

9. A working method of an oil plate heat exchanger flushing system, wherein any one of claims 6, 7 or 8 is used, two oil plate heat exchangers are provided, one of which is standby and the other is in operation, when one of the oil plate heat exchangers is stopped for flushing, the other oil plate heat exchanger is in operation, and the flushing mode adopts a flushing mode of alternating positive flushing and reverse flushing. The working method of the positive flushing is as follows: the switch valves on the parallel water inlet pipeline and the parallel water outlet pipeline corresponding to the oil plate heat exchanger to be flushed are closed, the switch valves on the first parallel flushing pipeline are closed, the switch valves on the second parallel flushing pipeline corresponding to the oil plate heat exchanger to be flushed are opened, the switch valve on the first return water pipeline close to the oil plate heat exchanger is opened, the switch valve on the first return water pipeline far from the oil plate heat exchanger is closed, the flushing pump pumps the flushing water in the water storage mechanism, the switch valve on the second return water pipeline is opened, the flushing pump pumps the flushing water in the water storage mechanism, the flushing water is input into the first return water pipeline from one branch pipeline on the second parallel flushing pipeline, then enters the cooling water inlet of the oil plate heat exchanger, then passes through the cooling water channel in the oil plate heat exchanger and is output from the cooling water outlet, and then is sent back to the water storage mechanism from the second return water pipeline through part of the parallel water outlet pipeline. The working method of the reverse flushing is as follows: the switch valves on the parallel water inlet pipeline and the parallel water outlet pipeline corresponding to the oil plate heat exchanger to be flushed are closed, the switch valves on the second parallel flushing pipeline are closed, the switch valves on the first parallel flushing pipeline corresponding to the oil plate heat exchanger to be flushed are opened, the two switch valves on the first return water pipeline are opened, the switch valve on the second return water pipeline is closed, the flushing pump pumps the flushing water in the water storage mechanism, the flushing water is input into part of the parallel water outlet pipeline from one branch pipeline on the first parallel flushing pipeline, then enters the cooling water outlet of the oil plate heat exchanger, then passes through the cooling water channel in the oil plate heat exchanger and is output from the cooling water inlet, and then is sent back to the water storage mechanism from the first return water pipeline.

10. The method of claim 9, wherein the oil plate heat exchanger is a shell and tube heat exchanger. The working method of the two oil plate heat exchangers in the standby and operation mode is as follows: the switch valves on the parallel water inlet pipeline and the parallel water outlet pipeline corresponding to the working oil plate heat exchanger are opened, and the switch valves on the parallel water inlet pipeline and the parallel water outlet pipeline corresponding to the standby oil plate heat exchanger are closed.

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