Backwashing method of plate heat exchanger

Abstract

The present invention relates to the technical field of plate heat exchangers, and specifically to a backwashing method for a plate heat exchanger, comprising a control console and at least two backwashing modules arranged near the plate heat exchanger, wherein the plate heat exchanger is fixedly connected with a corresponding medium inlet pipe and a medium outlet pipe at the position corresponding to each medium input and output. The beneficial effects are as follows: the backwashing method for a plate radiator designed by the present invention can be cleaned quickly, and the backwashing operation can be inserted more frequently during the working cycle of the plate heat exchanger, thereby effectively extending the service life of the equipment, and the flushing liquid in the cleaning process can also be repeatedly recycled, saving resources, and on the other hand, the impurities cleaned out can be collected by a separation filter and then removed manually, and the cleaning process of the separation filter will not affect the normal operation of the plate heat exchanger, and further reduces the occupation of the working time of the plate radiator.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a backwashing method for a plate heat exchanger. Background Art

[0002] The plate heat exchanger is a highly efficient medium heat exchange device. It has the advantages of high thermal efficiency, low heat loss, compact structure, and small footprint. However, during the heat exchange process, the medium will retain impurities inside the plate heat exchanger, which will cause obstruction in the plate heat exchanger and reduce the heat exchange efficiency. At this time, manual cleaning and maintenance are required, but manual cleaning and maintenance take a long time, which seriously delays the normal operation of the plate heat exchanger. The existing equipment that uses backwashing to clean the plate heat exchanger also takes a lot of time to reconnect the equipment. There is also a waste of flushing fluid during the flushing process. The entire flushing process also requires manual participation, so it is difficult to meet existing production needs. Summary of the invention

[0003] The object of the present invention is to provide a backwashing method for a plate heat exchanger to solve the problem in the above background technology that the existing plate radiator lacks a backwashing device with short flushing time and easy to use.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a backwashing method for a plate heat exchanger, comprising a control console and at least two backwashing modules arranged near the plate heat exchanger, wherein the plate heat exchanger is fixedly connected with a corresponding medium inlet pipe and a medium outlet pipe at a position corresponding to each medium input and output;

[0005] The backwashing method comprises a first connecting pipe, a first reflux pipe, a medium filter, a liquid storage tank, a second reflux pipe, a second connecting pipe and a separation filter, and the medium filter is installed in the middle of the first connecting pipe;

[0006] A second main valve is installed at the front end of the first connecting pipe corresponding to the connection with the external medium recovery device, and the end of the first connecting pipe is connected to the medium inlet pipe, and a first main valve is installed at the front end of the second connecting pipe corresponding to the connection with the external medium supply device, and the end of the second connecting pipe is connected to the medium outlet pipe;

[0007] The end of the first connecting pipe is connected to the second reflux pipe, and a second selector valve is installed in the middle of the second reflux pipe; the first connecting pipe is connected to the first reflux pipe at a middle position corresponding to the second main valve and the media filter, and a first selector valve is installed in the middle of the first reflux pipe;

[0008] A sealing seat is fixedly installed in the middle of the separation filter, and a filter screen for dividing the interior of the separation filter into an upper and lower part is fixedly installed on the sealing seat. The ends of the first reflux pipe and the second reflux pipe are both connected to the lower part of the inner cavity of the separation filter, and the upper part of the inner cavity of the separation filter is connected to the inner cavity of the liquid storage tank. A circulating pump connected to the interior of the liquid storage tank is installed on the liquid storage tank, and the output end of the circulating pump is connected to the end of the second connecting pipe. The console is electrically connected to the first main valve, the second main valve, the first selection valve, the second selection valve, the closing valve and the circulating pump through cables.

[0009] Preferably, an S7-200 type PLC controller and a display electrically connected to the controller are arranged inside the console, and a roller is installed at the bottom of the console.

[0010] Preferably, a second drain pipe connected to the interior of the separation filter for discharging impurities is installed at the bottom of the separation filter, and a second drain valve electrically connected to the console is installed on the second drain pipe. A steel frame for support is installed at the bottom of the separation filter, and the filter screen is fastened to the inner wall of the separation filter by a rubber pad or a soft plastic pad.

[0011] Preferably, the interior of the media filter uses a metal filter screen, a filter bag or a filter membrane for filtering, and the media filter is connected to the first connecting pipe by a flange.

[0012] Preferably, a box cover is installed on the upper end of the liquid storage box through a clamping seal, and a handle for facilitating opening of the box cover is fixedly installed on the box cover through bolts.

[0013] Preferably, a liquid supply pump for supplying flushing liquid to the interior of the liquid storage tank is fixedly mounted on the liquid storage tank, and a liquid inlet of the liquid supply pump is connected to an external flushing liquid supply device.

[0014] Preferably, a first liquid discharge pipe is connected to the bottom of the liquid storage tank, and a first liquid discharge valve for controlling liquid discharge from the first liquid discharge pipe is installed on the first liquid discharge pipe.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the backwashing method of the plate radiator designed in the present invention can quickly remove impurities inside the plate heat exchanger and can also clean impurities in the medium filter, thereby reducing the need for manual cleaning of the entire equipment, and the cleaning speed is fast. During the working cycle of the plate heat exchanger, the backwashing operation can be inserted more frequently, thereby effectively extending the service life of the equipment. The flushing liquid in the cleaning process can also be repeatedly recycled, saving resources. On the other hand, the impurities cleaned out can be collected by the separation filter and then manually removed. The cleaning process of the separation filter will not affect the normal operation of the plate heat exchanger, and the working time of the plate radiator is further reduced. Therefore, it has a high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the backwash module of the present invention;

[0018] Figure 3 It is a structural schematic diagram of the liquid storage tank of the present invention;

[0019] Figure 4 It is a schematic diagram of the installation of the first connecting pipe and the second connecting pipe of the present invention;

[0020] Figure 5 It is a schematic structural diagram of the separation filter of the present invention.

[0021] In the figure: 1. plate heat exchanger; 2. backwash module; 201. first connecting pipe; 202. first reflux pipe; 203. medium filter; 204. liquid storage tank; 205. second reflux pipe; 206. second connecting pipe; 207. separation filter; 3. circulation pump; 4. liquid supply pump; 5. filter screen; 6. sealing seat; 7. second drain valve; 8. second drain pipe; 9. first main valve; 10. second main valve; 11. first selection valve; 12. closing valve; 13. second selection valve; 14. handle; 15. box cover; 16. first drain pipe; 17. first drain valve; 18. control console; 19. medium inlet pipe; 20. medium outlet pipe. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the technical solutions in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figures 1 to 5 The present invention provides a technical solution: a backwashing method for a plate heat exchanger, comprising a control console 18 and at least two backwashing modules 2 arranged near a plate heat exchanger 1, wherein the plate heat exchanger 1 is fixedly connected with a corresponding medium inlet pipe 19 and a medium outlet pipe 20 at a position corresponding to each medium input and output;

[0024] Please refer to Figure 2 Zhihe Figure 4 , the backwash module 2 includes a first connecting pipe 201, a first reflux pipe 202, a medium filter 203, a liquid storage tank 204, a second reflux pipe 205, a second connecting pipe 206 and a separation filter 207, and the medium filter 203 is installed in the middle of the first connecting pipe 201, the front end of the first connecting pipe 201 is installed with a second main valve 10 at the corresponding connection with the external medium recovery device, and the end of the first connecting pipe 201 is connected to the medium inlet pipe 19, the front end of the second connecting pipe 206 is installed with a first main valve 9 at the corresponding connection with the external medium supply device, and the end of the second connecting pipe 206 is connected to the medium outlet pipe 20, the end of the first connecting pipe 201 is connected to the second reflux pipe 205, and the middle of the second reflux pipe 205 is installed with a second selection valve 13, the first connecting pipe 201 is connected to the first reflux pipe 202 at the middle position corresponding to the second main valve 10 and the medium filter 203, and the middle of the first reflux pipe 202 is installed with a first selection valve 11;

[0025] See also Figures 1 to 5 , a sealing seat 6 is fixedly installed in the middle of the separation filter 207, and a filter screen 5 for dividing the interior of the separation filter 207 into an upper and lower part is fixedly installed on the sealing seat 6, the ends of the first reflux pipe 202 and the second reflux pipe 205 are both connected to the lower part of the inner cavity of the separation filter 207, and the upper part of the inner cavity of the separation filter 207 is connected to the inner cavity of the liquid storage tank 204, a circulation pump 3 connected to the interior of the liquid storage tank 204 is installed on the liquid storage tank 204, and the output end of the circulation pump 3 is connected to the end of the second connecting pipe 206, the control console 18 is electrically connected to the first main valve 9, the second main valve 10, the first selection valve 11, the second selection valve 13, the closing valve 12 and the circulation pump 3 through cables, and an S7-200 type PLC controller and a display electrically connected to the controller are arranged inside the control console 18, and a roller is installed at the bottom of the control console 18;

[0026] See also Figure 5 A second drain pipe 8 for discharging impurities and communicating with the interior of the separation filter 207 is installed at the bottom of the separation filter 207, and a second drain valve 7 electrically connected to the console 18 is installed on the second drain pipe 8. A steel frame for support is installed at the bottom of the separation filter 207, and the filter screen 5 is fitted and clamped to the inner wall of the separation filter 207 through a rubber pad or a soft plastic pad;

[0027] See also Figures 3 to 5 The interior of the medium filter 203 adopts a metal filter mesh, a filter bag or a filter membrane for filtering operations, and the medium filter 203 is connected to the first connecting pipe 201 with a flange, and the upper end of the liquid storage tank 204 is installed with a box cover 15 through a clamping seal, and the box cover 15 is fixed with a handle 14 for facilitating opening of the box cover 15 by bolts, and a liquid supply pump 4 for supplying flushing liquid to the inside of the liquid storage tank 204 is fixedly installed on the liquid storage tank 204, and the liquid inlet of the liquid supply pump 4 is connected to the external flushing liquid supply device, and the bottom of the liquid storage tank 204 is connected to a first drain pipe 16, and the first drain pipe 16 is installed with a first drain valve 17 for controlling the discharge of liquid from the first drain pipe 16.

[0028] Working principle: The plate heat exchanger 1 in the present invention is mainly for the type of using two media for mutual heat exchange, and a corresponding backwash module 2 is installed for each of the two media to achieve rapid backwashing and cleaning. The working principle of any one of the backwash modules 2 will be introduced below. During the normal operation of the plate heat exchanger 1, the first selection valve 11 and the second selection valve 13 are in a closed state, and the first main valve 9, the second main valve 10 and the closing valve 12 are in an open state. At this time, the external medium supply device directly delivers the corresponding medium from the first connecting pipe 201 to the medium inlet pipe 19, and flows out from the medium outlet pipe 20 through the heat exchange port of the plate heat exchanger 1 to the second connecting pipe 206, and finally is recovered by the external medium recovery device connected to the second connecting pipe 206, thereby completing the heat exchange process of the medium. In this process, the medium filter 203 will also preliminarily filter some impurities in the medium. When the plate heat exchanger 1 needs to be backwashed, the external medium supply device and the external medium recovery device are first stopped, and the first main valve 9 and the second main valve 10 are closed. Then, a two-step cleaning procedure is used for cleaning: in the first step of the cleaning procedure, the first selection valve 11 and the closing valve 12 are in a closed state, and the second selection valve 13 is in an open state. At this time, the circulating pump 3 sends the flushing liquid in the liquid storage tank 204 through the second connecting pipe 206 and the medium outlet pipe 20 into the plate heat exchanger 1 in the reverse direction, so that the flushing liquid flushes the inside of the plate heat exchanger 1 at a high speed, and sends the waste liquid from the medium inlet pipe 19 to the first connecting pipe 201, and then through the second return pipe 206. The flow pipe 205 flows into the separation filter 207 and is filtered through the filter screen 5. The flushing liquid filtered by the filter screen 5 flows back to the liquid storage tank 204 to participate in the subsequent circulation. After the specified circulation time, the circulation of this step ends and enters the next step; in the second step cleaning procedure, the first selection valve 11 and the closing valve 12 are opened, and the second selection valve 13 is closed. At this time, the flushing liquid returning to the first connecting pipe 201 will first flow to the medium filter 203 and then flow into the separation filter 207 through the first return pipe 202. The other procedures are the same as in the first step cleaning procedure. After the second step cleaning procedure is completed, the plate heat exchanger 1 will return to the normal working state.In the first step of the cleaning procedure, it is mainly used to clean the impurities inside the plate heat exchanger 1 and prevent them from being washed into the medium filter 203, while in the second step of the cleaning procedure, it is mainly used to clean the impurities in the medium filter 203. This method can not only automatically and quickly remove the impurities inside the plate heat exchanger 1, but also remove the impurities in the medium filter 203, thereby replacing the traditional manual cleaning method, and does not require personnel to participate in the operation, and the cleaning speed is fast. During the working cycle of the plate heat exchanger 1, the backwashing operation can be inserted more frequently, thereby effectively extending the service life of the equipment. The flushing liquid in the cleaning process can also be repeatedly recycled, saving resources. Each medium uses an independent backwashing module 2 to prevent mixing between media, and it is also convenient to select corresponding flushing liquids for different media. The flushing liquid preferably selects the same substance as the medium, followed by substances that are easy to separate from the medium. On the other hand, the impurities cleaned out can be collected by the separation filter 207 and then removed manually. The cleaning process of the separation filter 207 will not affect the normal operation of the plate heat exchanger 1, and further reduces the occupation of the working time of the plate radiator, so it has a high practical value.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The backwashing method of the plate heat exchanger is characterized by: The system comprises a control console (18) and at least two backwash modules (2) arranged near a plate heat exchanger (1), wherein the plate heat exchanger (1) is fixedly connected with a corresponding medium inlet pipe (19) and a medium outlet pipe (20) at a position corresponding to each medium input and output; The backwash module (2) comprises a first connecting pipe (201), a first reflux pipe (202), a medium filter (203), a liquid storage tank (204), a second reflux pipe (205), a second connecting pipe (206) and a separation filter (207), and the medium filter (203) is installed in the middle of the first connecting pipe (201); A second main valve (10) is installed at the front end of the first connecting pipe (201) at a position corresponding to the connection with the external medium recovery device, and the end of the first connecting pipe (201) is connected to the medium inlet pipe (19); a first main valve (9) is installed at the front end of the second connecting pipe (206) at a position corresponding to the connection with the external medium supply device, and the end of the second connecting pipe (206) is connected to the medium outlet pipe (20); The end of the first connecting pipe (201) is connected to the second return pipe (205), and a second selection valve (13) is installed in the middle of the second return pipe (205); the first connecting pipe (201) is connected to the first return pipe (202) at a position corresponding to the middle of the second main valve (10) and the medium filter (203), and a first selection valve (11) is installed in the middle of the first return pipe (202); A sealing seat (6) is fixedly mounted in the middle of the separation filter (207), and a filter screen (5) for dividing the interior of the separation filter (207) into an upper and lower part is fixedly mounted on the sealing seat (6); the ends of the first reflux pipe (202) and the second reflux pipe (205) are both in communication with the lower part of the inner cavity of the separation filter (207), and the upper part of the inner cavity of the separation filter (207) is in communication with the inner cavity of the liquid storage tank (204); a circulation pump (3) in communication with the interior of the liquid storage tank (204) is mounted on the liquid storage tank (204), and the output end of the circulation pump (3) is in communication with the end of the second connecting pipe (206); the control console (18) is electrically connected to the first main valve (9), the second main valve (10), the first selection valve (11), the second selection valve (13), the closing valve (12) and the circulation pump (3) through cables; When the plate heat exchanger (1) needs to be backwashed, the external medium supply device and the external medium recovery device are first stopped, and the first main valve (9) and the second main valve (10) are closed. Then, a two-step cleaning procedure is used for cleaning: in the first step of the cleaning procedure, the first selection valve (11) and the closing valve (12) are in a closed state, and the second selection valve (13) is in an open state. At this time, the circulation pump (3) sends the flushing liquid in the liquid storage tank (204) through the second connecting pipe (206) and the medium outlet pipe (20) into the plate heat exchanger (1) in reverse, so that the flushing liquid flushes the inside of the plate heat exchanger (1) at a high speed, and sends the waste liquid from the medium inlet pipe (19) to the first connecting pipe (201), and then flows into the separation filter (207) through the second return pipe (205) and passes through the filter screen (5) for filtration. The waste liquid is filtered by the filter screen (5). The filtered flushing liquid flows back into the liquid storage tank (204) to participate in the subsequent circulation. After the specified circulation time, the circulation of this step ends and the next step is entered. In the second cleaning procedure, the first selection valve (11) and the closing valve (12) are opened, while the second selection valve (13) is closed. At this time, the flushing liquid returning to the first connecting pipe (201) will first flow to the medium filter (203) and then flow into the separation filter (207) through the first return pipe (202). The other procedures are the same as those in the first cleaning procedure. After the second cleaning procedure is completed, the plate heat exchanger (1) will return to its normal working state. In the first cleaning procedure, it is mainly used to clean the impurities inside the plate heat exchanger (1) and prevent them from being washed into the medium filter (203), while in the second cleaning procedure, it is mainly used to clean the impurities in the medium filter (203).

2. The backwashing method of a plate heat exchanger according to claim 1, characterized in that: The console (18) is internally provided with an S7-200 type PLC controller and a display electrically connected to the controller, and a roller is installed at the bottom of the console (18).

3. The backwashing method for a plate heat exchanger according to claim 1, characterized in that: A second drain pipe (8) for discharging impurities and communicating with the interior of the separation filter (207) is installed at the bottom of the separation filter (207), and a second drain valve (7) electrically connected to the control console (18) is installed on the second drain pipe (8). A steel frame for support is installed at the bottom of the separation filter (207), and the filter screen (5) is fitted and clamped to the inner wall of the separation filter (207) via a rubber pad or a soft plastic pad.

4. The backwashing method for a plate heat exchanger according to claim 1, characterized in that: The interior of the media filter (203) uses a metal filter screen, a filter bag or a filter membrane to perform filtering operations, and the media filter (203) is connected to the first connecting pipe (201) using a flange.

5. The backwashing method for a plate heat exchanger according to claim 1, characterized in that: A box cover (15) is mounted on the upper end of the liquid storage box (204) by means of a clamping seal, and a handle (14) for facilitating opening of the box cover (15) is fixedly mounted on the box cover (15) by means of bolts.

6. The backwashing method for a plate heat exchanger according to claim 1, characterized in that: A liquid supply pump (4) for supplying flushing liquid to the interior of the liquid storage tank (204) is fixedly mounted on the liquid storage tank (204), and a liquid inlet of the liquid supply pump (4) is connected to an external flushing liquid supply device.

7. The backwashing method for a plate heat exchanger according to claim 1, characterized in that: The bottom of the liquid storage tank (204) is connected to a first liquid discharge pipe (16), and a first liquid discharge valve (17) for controlling liquid discharge from the first liquid discharge pipe (16) is installed on the first liquid discharge pipe (16).

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