On-line cleaning device for plate heat exchanger of heat exchange unit

Abstract

The utility model discloses an on-line cleaning device for a heat exchanger unit plate heat exchanger, and relates to the technical field of heat exchanger cleaning. Comprising a cleaning pump and a heat exchange unit plate heat exchanger body, the cleaning pump injects high-pressure water into the heat exchange unit plate heat exchanger body for cleaning, a purified water inlet pipeline is arranged on the cleaning pump, and a cleaning water injection pipeline is arranged between the cleaning pump and the heat exchange unit plate heat exchanger body. The cleaning water recycling mechanism is used for recycling cleaning sewage discharged by a plate heat exchanger body of the heat exchange unit and comprises a recycling tank, and a drainage pipeline is connected between the recycling tank and a drainage port of the plate heat exchanger body of the heat exchange unit; and the solid-liquid separation mechanism is arranged in the recovery tank and is used for carrying out solid-liquid separation on cleaning sewage discharged by the plate heat exchanger body of the heat exchange unit.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger cleaning technology, and in particular to an online cleaning device for plate heat exchangers in heat exchange units. Background Technology

[0002] Plate heat exchangers are high-efficiency heat exchange devices composed of a series of metal plates with a specific corrugated shape. These metal plates form thin rectangular channels through which heat exchange occurs.

[0003] Overhauling plate heat exchangers in heat exchange units requires significant manpower for disassembly and cleaning, resulting in a large workload. Furthermore, the rubber strips are prone to deformation, leading to leaks, and replacing the rubber strips is costly. Additionally, plate heat exchangers accumulate solid waste over long-term use, and the water used for cleaning them is typically discharged directly, causing substantial water waste.

[0004] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop an online cleaning device for plate heat exchangers in heat exchange units. Utility Model Content

[0005] The purpose of this invention is to provide an online cleaning device for plate heat exchangers in heat exchange units in order to solve the above-mentioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model discloses an online cleaning device for a plate heat exchanger, comprising a cleaning pump and a plate heat exchanger body. The cleaning pump injects high-pressure water into the plate heat exchanger body for cleaning. The cleaning pump has a clean water inlet pipe, and a cleaning water injection pipe is provided between the cleaning pump and the plate heat exchanger body. The device also includes a cleaning water recycling mechanism for recycling the cleaning wastewater discharged from the plate heat exchanger body for reuse. The cleaning water recycling mechanism includes:

[0008] A recovery tank is provided, and a drainage pipe is connected between the recovery tank and the drain outlet of the plate heat exchanger body of the heat exchange unit.

[0009] A solid-liquid separation mechanism is installed in the recovery tank to separate the cleaning wastewater discharged from the plate heat exchanger body of the heat exchange unit into solids and liquids. A recovery water pipe is provided between the recovery tank and the clean water inlet pipe to inject the water after solid-liquid separation into the clean water inlet pipe and then into the cleaning pump for use.

[0010] Furthermore, the bottom of the recycling tank is conical and a solid discharge channel is provided at the very bottom.

[0011] Furthermore, the solid-liquid separation mechanism includes:

[0012] An inclined guide plate is inclinedly disposed inside the recycling tank, and the inclined guide plate is inclined downward from the top of the recycling tank and located below the position where the drainage pipe communicates with the recycling tank;

[0013] An inclined filter screen is inclinedly disposed inside the recovery tank. One end of the inclined filter screen is connected to the lower end of the inclined guide plate, and the other end extends to the inner wall of the recovery tank in a direction opposite to the inclination of the inclined guide plate.

[0014] A horizontal filter screen is installed horizontally inside the recycling tank. One end of the horizontal filter screen is connected to the inclined guide plate, and the other end is connected to the inner wall of the recycling tank and located above the inclined filter screen.

[0015] Furthermore, the location where the recycled water pipe connects to the recycled tank is above the horizontal filter screen.

[0016] Furthermore, a screw conveyor is provided at the bottom of the recycling tank and communicates with the solid discharge channel, and the feed inlet of the screw conveyor is connected to the solid discharge channel at the bottom of the recycling tank.

[0017] Furthermore, a water pump is installed on the recycled water pipeline to pump recycled water to the cleaning pump.

[0018] The online cleaning device for plate heat exchangers of the heat exchange unit provided by this utility model has the following beneficial effects:

[0019] This device cleans the plate heat exchanger of the heat exchange unit using a cleaning pump, and then recycles the used cleaning water through a cleaning water recovery and reuse mechanism to rinse the plate heat exchanger again. This achieves the purpose of recycling water resources for reuse, saving water used for cleaning the plate heat exchanger. Furthermore, the online cleaning of the plate heat exchanger does not require disassembly, reducing workload and the risk of damage to parts caused by disassembly. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the structure of the online cleaning device for plate heat exchangers in the heat exchange unit provided in this embodiment of the utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Cleaning pump; 2. Plate heat exchanger body of heat exchange unit; 3. Clean water inlet pipe; 4. Cleaning water injection pipe; 5. Recovery tank; 6. Drainage pipe; 7. Recovery water pipe; 8. Solid discharge channel; 9. Inclined guide plate; 10. Inclined filter screen; 11. Horizontal filter screen; 12. Screw conveyor; 13. Water pump. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0025] Please see Figure 1 An online cleaning device for plate heat exchangers includes a cleaning pump 1 and a plate heat exchanger body 2. The cleaning pump 1 injects high-pressure water into the plate heat exchanger body 2 for cleaning, achieving a rinsing effect. The cleaning pump 1 has a clean water inlet pipe 3 to introduce clean water for cleaning the plate heat exchanger body 2. A cleaning water injection pipe 4 is installed between the cleaning pump 1 and the plate heat exchanger body 2 to introduce clean water into the plate heat exchanger body 2 for cleaning. The device also includes a cleaning water recycling mechanism to recover and reuse the cleaning wastewater discharged from the plate heat exchanger body 2. The clean water inlet pipe 3 is throttled. The cleaning water recycling mechanism includes:

[0026] The recovery tank 5 is connected to the drain outlet of the plate heat exchanger body 2 of the heat exchange unit via a drain pipe 6, so that the water used for rinsing can be introduced into the recovery tank 5 for solid-liquid separation through the drain pipe 6.

[0027] The solid-liquid separation mechanism is installed in the recovery tank 5 to separate the cleaning wastewater discharged from the plate heat exchanger body 2 of the heat exchange unit into solids and liquids. A recovery water pipe 7 is installed between the recovery tank 5 and the clean water inlet pipe 3 to inject the water after solid-liquid separation into the clean water inlet pipe 3 and into the cleaning pump 1. The separated water is then used to clean the plate heat exchanger body 2 of the heat exchange unit. After several cycles, the water is basically cleaned, and the drainage from the subsequent drainage pipe 6 is also clean. It can be used to rinse the inside of the recovery tank 5 and the solid-liquid separation mechanism, and then reserved for other uses, thus achieving the effect of saving water.

[0028] Furthermore, the bottom of the recycling tank 5 is conical, and a solid discharge channel 8 is provided at the very bottom. The conical bottom makes it easier to contain solid sediment, which is then discharged through the solid discharge channel 8.

[0029] Furthermore, the solid-liquid separation mechanism includes:

[0030] Inclined guide plate 9 is inclinedly installed inside the recycling tank 5. The inclined guide plate 9 is inclined downward from the top of the recycling tank 5 and is located below the position where the drain pipe 6 connects to the recycling tank 5.

[0031] An inclined filter screen 10 is inclinedly disposed inside the recovery tank 5. One end of the inclined filter screen 10 is connected to the lower end of the inclined guide plate 9, and the other end extends to the inner wall of the recovery tank 5 in a direction opposite to the inclination of the inclined guide plate 9.

[0032] A horizontal filter screen 11 is horizontally installed inside the recovery tank 5. One end of the horizontal filter screen 11 is connected to the inclined guide plate 9, and the other end is connected to the inner wall of the recovery tank 5 and is located above the inclined filter screen 10.

[0033] Specifically, the solid-liquid mixture discharged from the drainage pipe 6 enters the recovery tank 5 and flows along the inclined guide plate 9 to the bottom of the recovery tank 5. Under the impact of the water flow, the solids settle, and the sewage carries some sludge and other solids to the inclined filter screen 10. The inclined filter screen 10 intercepts the solids and allows the water to pass through. As the water level in the recovery tank 5 rises, the water that reaches the horizontal filter screen 11 is filtered again by the horizontal filter screen 11. The water after two filtrations rises above the horizontal filter screen 11, completing a simple solid-liquid separation.

[0034] Furthermore, the connection between the recycled water pipe 7 and the recycled tank 5 is located above the horizontal filter screen 11. The water after solid-liquid separation is directly led through the recycled water pipe 7 to the clean water inlet pipe 3 and enters the cleaning pump 1 together with the clean water for reuse.

[0035] Furthermore, a screw conveyor 12 connected to the solid discharge channel 8 is installed at the bottom of the recovery tank 5. The inlet of the screw conveyor 12 is connected to the solid discharge channel 8 at the bottom of the recovery tank 5, so that the sediment settled to the bottom of the cleaning pump 1 is gradually discharged through the screw conveyor 12. The screw conveyor 12 carries away the sediment at a slow speed, allowing the mixture sufficient time to settle. The sediment discharged from the screw conveyor 12 also carries away some wastewater, causing the cleaning pump 1 at the conical bottom to form a vortex, accelerating the formation of sediment. Alternatively, the screw conveyor 12 can be operated intermittently, waiting for the sediment to settle completely before discharging.

[0036] Furthermore, a water pump 13 is installed on the recycling water pipe 7 to pump recycled water to the cleaning pump 1, so as to accelerate the extraction of water that has been filtered twice above the horizontal filter screen 11 and introduce it into the drainage pipe 6 for use.

[0037] In summary, this device cleans the plate heat exchanger of the heat exchange unit using a cleaning pump, and then recycles the used cleaning water through a cleaning water recovery and reuse mechanism to rinse the plate heat exchanger again. This achieves the goal of recycling water resources for reuse, saving water used for cleaning the plate heat exchanger. Furthermore, the online cleaning of the plate heat exchanger does not require disassembly, reducing workload and the risk of damage to parts caused by disassembly.

[0038] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An online cleaning device for a plate heat exchanger of a heat exchange unit, comprising a cleaning pump (1) and a plate heat exchanger body (2), wherein the cleaning pump (1) injects high-pressure water into the plate heat exchanger body (2) for cleaning, the cleaning pump (1) has a clean water inlet pipe (3), and a cleaning water injection pipe (4) is provided between the cleaning pump (1) and the plate heat exchanger body (2), characterized in that, It also includes a cleaning water recycling mechanism, which is used to recycle the cleaning wastewater discharged from the plate heat exchanger body (2) of the heat exchange unit for reuse. The cleaning water recycling mechanism includes: A recovery tank (5) is connected to a drain pipe (6) between the recovery tank (5) and the drain outlet of the plate heat exchanger body (2) of the heat exchange unit. A solid-liquid separation mechanism is provided in the recovery tank (5) to separate the cleaning wastewater discharged from the plate heat exchanger body (2) of the heat exchange unit into solid and liquid components. A recovery water pipe (7) is provided between the recovery tank (5) and the clean water inlet pipe (3) to inject the water after solid-liquid separation into the clean water inlet pipe (3) and into the cleaning pump (1) for use.

2. The online cleaning device for plate heat exchangers of a heat exchange unit according to claim 1, characterized in that, The bottom of the recycling tank (5) is conical and a solid discharge channel (8) is provided at the bottom.

3. The online cleaning device for plate heat exchangers of a heat exchange unit according to claim 1, characterized in that, The solid-liquid separation mechanism includes: Inclined guide plate (9), the inclined guide plate (9) is inclinedly arranged inside the recycling tank (5), the inclined guide plate (9) is inclined downward from the top inside the recycling tank (5) and is located below the position where the drainage pipe (6) connects with the recycling tank (5); An inclined filter screen (10) is inclinedly disposed inside the recovery tank (5). One end of the inclined filter screen (10) is connected to the lower end of the inclined guide plate (9), and the other end extends to the inner wall of the recovery tank (5) in a direction opposite to the inclination of the inclined guide plate (9). A horizontal filter screen (11) is horizontally arranged inside the recycling tank (5). One end of the horizontal filter screen (11) is connected to the inclined guide plate (9), and the other end is connected to the inner wall of the recycling tank (5) and located above the inclined filter screen (10).

4. The online cleaning device for plate heat exchangers of heat exchange units according to claim 3, characterized in that, The location where the recycled water pipe (7) connects to the recycled tank (5) is above the horizontal filter screen (11).

5. The online cleaning device for plate heat exchangers of a heat exchange unit according to claim 2, characterized in that, The bottom of the recycling tank (5) is provided with a screw conveyor (12) that communicates with the solid discharge channel (8). The feed inlet of the screw conveyor (12) is connected to the solid discharge channel (8) at the bottom of the recycling tank (5).

6. The online cleaning device for plate heat exchangers of a heat exchange unit according to claim 1, characterized in that, A water pump (13) is installed on the recycled water pipeline (7) to pump recycled water to the cleaning pump (1).

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