Cleaning equipment for plate heat exchanger

Abstract

The utility model discloses cleaning equipment for a plate heat exchanger, which comprises a movable base, a water tank is fixedly arranged on the movable base, and the water tank is used for storing cleaning fluid; a cleaning water pump communicated with the bottom of the water tank is further fixed on the movable base, the cleaning water pump is further electrically connected with an electric control cabinet, and the electric control cabinet is used for controlling the cleaning water pump; a water outlet of the cleaning water pump is used for being connected with a plate heat exchanger, and a water outlet of the plate heat exchanger is communicated with the water tank. For heat exchanger equipment without a cleaning process flow, the movable cleaning equipment is connected with the heat exchanger equipment to form a closed-loop system, the cleaning water pump is controlled by the electric control cabinet to pump cleaning liquid in the water tank to clean the heat exchanger equipment, a machine-disassembling cleaning mode is changed into a machine-disassembling-free in-situ cleaning mode, the requirements of multiple working sections can be met, and the cleaning efficiency is improved. And deep cleaning of the medium sides of a plurality of heat exchangers in different forms.

Description

Technical Field

[0001] This utility model relates to the field of cleaning equipment for plate heat exchangers, and more particularly to cleaning equipment for plate heat exchangers. Background Technology

[0002] When the heat exchange efficiency of ammonia-based plate heat exchangers decreases, cleaning is necessary. On the ammonia plate heat exchanger (medium side), cleaning can be achieved through ammonia evaporation and heat exchange with the ammonia, followed by bottom oil drainage. However, without a connected cleaning system and equipment on the product side, in-situ cleaning is not possible. The conventional cleaning method requires shutting down the equipment, closing the inlet and outlet valves, evacuating the ammonia and gas from the heat exchanger, checking the vacuum pressure, and, if no internal leaks are found, further air replacement. Only after confirming complete ammonia removal can the unit be disassembled. Disassembly is then performed, and the plate heat exchanger is opened for cleaning fin by fin. After cleaning, the plates are reinstalled according to the marked order. During this process, the gaskets may be damaged or deformed and unusable, requiring replacement with spare parts. A pressure test is then performed after installation.

[0003] Then, clean water is introduced into the product side, and N2 gas is introduced into the ammonia plate heat exchanger side for a gradual pressure test, followed by a comprehensive leak check. If a leak is found, such as a pressure drop after holding the pressure for 30 minutes, the unit needs to be disassembled, inspected, and reinstalled. This process continues until the unit is completely leak-free during the pressure test. This method is inefficient, requiring 3 to 4 maintenance personnel to complete the task over two days, and carries a significant risk of ammonia leakage. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a cleaning device for plate heat exchangers, thereby solving the problem of requiring disassembly for cleaning in the prior art.

[0005] This utility model provides a cleaning device for plate heat exchangers, including a movable base, on which a water tank is fixedly mounted for storing cleaning fluid; a cleaning water pump connected to the bottom of the water tank is also fixedly mounted on the movable base, and the cleaning water pump is electrically connected to an electrical control cabinet for controlling the cleaning water pump; the outlet of the cleaning water pump is connected to the plate heat exchanger, and the drain outlet of the plate heat exchanger is connected to the water tank.

[0006] In one alternative embodiment, the drain outlet of the plate heat exchanger is connected to the water tank via a recovery pipe, which is connected to the upper part of the water tank.

[0007] In one optional embodiment, the recovery pipeline is equipped with an acid-base meter and a conductivity meter. The acid-base meter is used to detect the pH value of the recovered cleaning solution, and the conductivity meter is used to detect the conductivity of the recovered cleaning solution.

[0008] In one optional embodiment, the acid-base meter and the conductivity meter are both connected to the electrical control cabinet, and the electrical control cabinet includes a display, which is at least used to display the values ​​detected by the acid-base meter and the conductivity meter.

[0009] In one alternative embodiment, the outlet of the cleaning water pump is connected to the plate heat exchanger via a high-pressure hose, and the drain outlet of the plate heat exchanger is connected to the recovery pipe via a high-pressure hose.

[0010] In one alternative embodiment, the high-pressure hose has threaded hydraulic fittings at both ends.

[0011] In one alternative embodiment, the bottom and top of the water tank are respectively provided with vent valves.

[0012] In one alternative embodiment, the top of the water tank is provided with a perforated valve.

[0013] In one alternative embodiment, a filter baffle is provided inside the water tank near the bottom.

[0014] In one alternative embodiment, the cleaning equipment further includes a stainless steel butterfly valve located at the inlet or outlet of the water tank.

[0015] This invention addresses heat exchanger equipment lacking a dedicated cleaning process by utilizing a mobile cleaning device to connect the heat exchanger equipment and form a closed-loop system. The cleaning water pump, controlled by an electrical control cabinet, extracts cleaning fluid from the water tank to clean the heat exchanger equipment, transforming the disassembly-based cleaning method into in-situ cleaning without disassembly. This approach can satisfy the need for deep cleaning of the medium side of multiple sections and multiple heat exchangers of different types. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a cleaning device for a plate heat exchanger in one embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of a filter baffle in one embodiment of the present invention.

[0018] Figure label:

[0019] 1. Water tank; 2. Hole cover valve; 3. Vent valve; 4. Observation window; 5. Acid-base meter; 6. Conductivity meter; 7. Stainless steel butterfly valve; 8. Casters; 9. Filter baffle; 10. Cleaning water pump; 11. Electrical control cabinet; 12. Movable base; 13. Recycling pipe; 14. Conveying pipe; 15. Water outlet; 16. Circulation pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. It should be noted that the following embodiments can be combined in the absence of conflict.

[0021] like Figure 1 As shown, this utility model provides a cleaning device for plate heat exchangers. The cleaning device includes a movable base 12, on which a water tank 1 is fixedly mounted. The water tank 1 stores cleaning fluid. The cleaning fluid can be a 10% citric acid monohydrate aqueous solution. In some embodiments of this utility model, the movable base 12 is a mobile cart equipped with four casters 8 at its bottom, allowing the cleaning device to move freely to the heat exchanger requiring cleaning. This enables in-situ cleaning without disassembly during shutdown, while not affecting the normal operation of other equipment.

[0022] The movable base 12 is also fixed with a cleaning water pump 10 that communicates with the bottom of the water tank 1. The cleaning water pump 10 can be a stainless steel sanitary centrifugal pump with a power of 5.5KW and a flow rate of 40m³ / h. 3 / H, head 30m.

[0023] The cleaning water pump 10 is electrically connected to an electrical control cabinet 11, which is used to control the cleaning water pump 10. The electrical control cabinet 11 is designed according to the electrical control cabinet 11 standard and includes, but is not limited to, a controller, control switch, display, protection circuit, etc.

[0024] The outlet 15 of the cleaning water pump 10 is connected to a plate heat exchanger, and the drain outlet of the plate heat exchanger is connected to the water tank 1. For example... Figure 1 As shown in the diagram, the cleaning device and the heat exchanger are connected in series to form a closed-loop system, as indicated by the arrows. The cleaning water pump 10 draws the cleaning fluid from the water tank 1 and delivers it to the heat exchanger, then discharges it from the heat exchanger and returns it to the water tank 1.

[0025] Furthermore, the drain outlet of the plate heat exchanger is connected to the water tank 1 via a recovery pipe 13 (i.e., the recovery port), and the recovery pipe 13 is connected to the upper part of the water tank 1. The recovery pipe 13 is equipped with an acid-base meter 5 and a conductivity meter 6. The acid-base meter 5 is used to detect the pH value of the recovered cleaning solution, and the conductivity meter 6 is used to detect the conductivity of the recovered cleaning solution. The cleaning effect can be verified by measuring the pH value and conductivity.

[0026] In some embodiments, the acidity measurement results of citric acid are as follows:

[0027] At a concentration of 0.25%, the pH value is 2.62; at a concentration of 1%, the pH value is 2.31; at a concentration of 2%, the pH value is 2.09; at a concentration of 3%, the pH value is 2.03; and at a concentration of 10%, the pH value is 1.63.

[0028] The data above shows that the acidity of citric acid decreases significantly with increasing concentration. Low-concentration citric acid solutions are more acidic, while high-concentration solutions are relatively milder. Lower-concentration citric acid solutions are effective at removing limescale and metal oxides, while higher-concentration solutions are suitable for deeper cleaning tasks.

[0029] A 10% citric acid monohydrate solution is used for normal cleaning. During the cleaning process, the citric acid in the cleaning solution reacts chemically with the impurities and scale inside the ammonia plate heat exchanger, causing the concentration to gradually decrease. This concentration change can be detected using an online pH meter. When the concentration decreases and the pH reading is around 2.1, the low concentration is maintained, and the solution is circulated for approximately 30 minutes. A gradual increase in the conductivity of the cleaning solution can be observed. When the conductivity stops increasing, it indicates that the scale has been largely removed.

[0030] The acid-base meter 5 and conductivity meter 6 are both connected to the electrical control cabinet 11. The electrical control cabinet 11 includes a display, which is used to display at least the values ​​detected by the acid-base meter 5 and conductivity meter 6. The electrical control cabinet 11 controls the start and stop of the cleaning water pump 10 and the power supply and display feedback of the acid-base meter 5 and conductivity meter 6.

[0031] Furthermore, the outlet 15 of the cleaning water pump 10 is connected to the plate heat exchanger via a high-pressure hose, and the drain outlet of the plate heat exchanger is connected to the recovery pipe 13 via a high-pressure hose. The high-pressure hose is a flexible pipe capable of withstanding high pressure; those skilled in the art can select existing high-pressure hoses according to their needs. Both ends of the high-pressure hose are equipped with threaded hydraulic fittings to ensure a secure connection and prevent cleaning fluid leakage.

[0032] As one embodiment, the heat exchanger unit has a volume of 0.7 m³. 3 The inlet and outlet pipelines have a capacity of approximately 0.05m³. 3 High-pressure hose capacity 0.05m 3 The cleaning water pump 10 can return to the water tank 1 after 1.2 minutes of operation. The cleaning fluid has a residence time of 1 minute inside the plate heat exchanger, which can fully react with and dissolve the dirt.

[0033] The cleaning equipment also includes a stainless steel butterfly valve 7, which is located at the inlet or outlet of the water tank 1.

[0034] like Figure 1 As shown, stainless steel butterfly valves 7 are installed on the recycling pipe 13, the conveying pipe 14 between the cleaning water pump 10 and the water tank 1, and the outlet 15 of the cleaning water pump 10. The stainless steel butterfly valve 7 can be a DN50 three-piece stainless steel wafer butterfly valve or a DN65 three-piece stainless steel wafer butterfly valve.

[0035] The stainless steel butterfly valve functions as a switch to open and close the process flow during equipment cleaning. The stainless steel butterfly valve 7 on the recovery pipe 13 controls the return of the cleaning fluid from the heat exchanger to the cleaning fluid container. When the heat exchanger needs to be soaked for descaling, closing the stainless steel butterfly valve on the recovery pipe 13 ensures the heat exchanger is filled with cleaning fluid, preventing it from circulating back to the cleaning fluid container. The stainless steel butterfly valve 7 on the delivery pipe 14 is closed when preparing a citric acid monohydrate solution. Water is then added to the container, and the citric acid monohydrate is added for dissolution, preventing pump blockage. The stainless steel butterfly valve 7 on the outlet pipe 15 is used for opening and closing during cleaning. After adding citric acid monohydrate to the circulation pipe 16, the stainless steel butterfly valve 7 on the outlet pipe 15 is closed, while the stainless steel butterfly valves 7 on the circulation pipe 16 and the delivery pipe 14 are opened. The water pump is then turned on for circulation, ensuring the citric acid monohydrate is fully dissolved and at a uniform concentration. After complete and uniform dissolution, the stainless steel butterfly valve 7 on the circulation pipe 16 is closed, the stainless steel butterfly valve 7 on the outlet pipe 15 is opened, and the water pump is turned on for cleaning.

[0036] The outlet 15 of the cleaning water pump 10 is also connected to the water tank 1 through the circulation pipe 16. When preparing the citric acid monohydrate solution, the solution is circulated to ensure that the citric acid is fully dissolved and the concentration is uniform.

[0037] Furthermore, the bottom and top of the water tank 1 are respectively equipped with vent valves 3 for venting and preventing the water tank 1 from being sucked down by negative pressure. The top of the water tank 1 is equipped with a cap valve 2 for securing the pressure cap. The side wall of the water tank 1 is equipped with an observation window 4, through which the color change and liquid level of the cleaning solution can be observed, allowing for timely replenishment of cleaning solution when the level is low. Figure 1 and Figure 2 As shown, a filter baffle 9 is provided inside the water tank 1 near the bottom. In some embodiments, a disc-shaped stainless steel perforated plate with a hole diameter of 5mm is used to prevent large debris from falling into the container and clogging the pipes, and also to prevent citric acid from clumping and clogging the pipes and water pump.

[0038] This invention addresses the issue of heat exchanger equipment lacking a dedicated cleaning process. It utilizes a mobile cleaning device connected to the heat exchanger to form a closed-loop system. A cleaning water pump, controlled by an electrical control cabinet, draws cleaning fluid from a tank to clean the heat exchanger, transforming the disassembly-based cleaning method into in-situ cleaning without disassembly. This allows for deep cleaning of the medium side of multiple heat exchangers across multiple sections and of different types. This invention is also applicable to the cleaning of shell-and-tube heat exchangers.

[0039] Each cleaning unit requires only two people and approximately three hours to complete, without disassembly, reducing the risk of ammonia leakage, ensuring safe operation, and improving efficiency. In existing technologies, stationary cleaning equipment requires four units for each ammonia plate heat exchanger, resulting in high investment and space consumption, which is unsuitable for small workshop spaces. Using this invention can save on fixed asset investment.

[0040] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various components or elements of this utility model and do not specifically refer to any component or element in this utility model. They should not be construed as limiting this utility model.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances, and they should not be construed as limitations on this utility model.

[0042] 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.

[0043] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cleaning apparatus for plate heat exchangers, characterized in that The utility model provides a cleaning device, including movable base, movable base is fixed with water tank, water tank is used for storing cleaning liquid, movable base is still fixed with the cleaning water pump who communicates with the bottom of water tank, cleaning water pump is connected with an electric control cabinet electricity again, electric control cabinet is used for controlling cleaning water pump, the water outlet of cleaning water pump is used for connecting plate heat exchanger, the water outlet of plate heat exchanger communicates with water tank, the water outlet of cleaning water pump still communicates with water tank through circulation pipeline, when water lemon acid aqueous solution is configured, carries out circulation, The water outlet of plate heat exchanger communicates with water tank through recovery pipeline, recovery pipeline is connected to the upper portion of water tank, acid-base table and electric conductivity table are arranged on recovery pipeline, acid-base table is used for detecting the pH value of recovered cleaning liquid, electric conductivity table is used for detecting the electric conductivity of recovered cleaning liquid, and the cleaning effect is tested through pH value and electric conductivity, when electric conductivity no longer rises, then dirt is cleaned.

2. Cleaning apparatus for plate heat exchangers according to claim 1, characterized in that The acid-base table and electric conductivity table are connected to the electric control cabinet, which includes a display for displaying the values detected by the acid-base table and electric conductivity table.

3. Cleaning apparatus for plate heat exchangers according to claim 1, characterized in that The water outlet of the cleaning water pump is connected to the plate heat exchanger through a high-pressure hose, and the water outlet of the plate heat exchanger is connected to the recovery pipeline through a high-pressure hose.

4. Cleaning apparatus for plate heat exchangers according to claim 3, characterized in that Both ends of the high-pressure hose are provided with threaded hydraulic connectors.

5. Cleaning apparatus for plate heat exchangers according to claim 1, characterized in that The bottom and upper part of the water tank are respectively provided with exhaust valves.

6. Cleaning apparatus for plate heat exchangers according to claim 1, characterized in that The top of the water tank is provided with a hole cover valve.

7. Cleaning apparatus for plate heat exchangers according to claim 1, characterized in that A filter baffle is arranged near the bottom of the water tank.

8. Cleaning apparatus for plate heat exchangers according to claim 1, characterized in that The cleaning device further comprises a stainless steel butterfly valve arranged at the inlet or outlet of the water tank.

Images