Dirt cleaning system for heat exchange tube of cooler in coal gas purification treatment process

Abstract

The utility model belongs to the technical field of coal gas purification, and discloses a dirt cleaning system for a heat exchange tube of a cooler in a coal gas purification treatment process. The dirt cleaning system for the heat exchange tube comprises a cleaning water tank, a cleaning water pump, a water feeding pipeline, a recycling pipeline and a configured valve, and a partition plate is arranged in the cleaning water tank, so that scale and cleaning water are separated, and the whole dirt cleaning system has the advantages of being small in water consumption, little in generated cleaning sewage, low in cleaning cost, good in environmental protection performance and the like. Meanwhile, a liquid level transmitter is installed on a cleaning water tank, an automatic control valve is additionally arranged on a water supplementing pipeline, liquid level interlocking control is conducted through a DCS, and automation of the water supplementing process is achieved. In addition, structures such as a slide carriage, a water receiving plate and a baffle plate are additionally arranged in the cleaning water tank, so that dirt at the bottom of the cleaning water tank can be quickly and effectively discharged. According to the utility model, the cleaning water tank structure and the circulating flushing system are optimally designed, so that the cleaning water tank is kept clean and operates efficiently.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal gas purification, and in particular relates to a heat exchange tube dirt cleaning system for a cooler in a coal gas purification process. Background Art

[0002] In the field of coal chemical industry, gas purification process is an important link to ensure the safety, efficiency and environmental protection of the production process. Among them, the horizontal tube gas cooler, as a common gas cooling equipment, plays an indispensable role in the gas purification device. The equipment uses cooling water to indirectly exchange heat with the gas, so that the saturated water vapor, tar and other impurities in the gas are cooled from gas to liquid, thereby achieving the purpose of reducing the gas temperature and meeting the process control requirements.

[0003] However, in actual operation, the horizontal tube gas cooler faces a common problem: scaling is easy to form inside the tube bundle. This scaling phenomenon not only leads to a significant decrease in heat exchange efficiency and affects normal production operations, but also may cause equipment failure if not handled in time, and even threaten the safety of the entire coal chemical production line.

[0004] At present, the traditional solutions to the scaling problem inside the tube bundle of the horizontal tube gas cooler mainly include tube bundle replacement and mechanical cleaning. However, both solutions have certain limitations. On the one hand, tube bundle replacement requires shutdown for maintenance, which is not only difficult to implement, but also costly and has a serious impact on production operations; on the other hand, although mechanical cleaning can remove the dirt inside the tube bundle to a certain extent, it is complicated to operate, has limited effect, and is prone to secondary damage to the equipment.

[0005] Therefore, there is an urgent need to develop a new solution that is flexible, convenient, low-cost and can effectively remove dirt from the heat exchange tubes of the horizontal tube gas cooler, which has become a technical problem that needs to be solved urgently in the coal chemical industry. Utility Model Content

[0006] In view of the scaling problem inside the tube bundle of the horizontal tube type coal gas cooler in the background technology, the traditional solutions have many disadvantages in the actual implementation process. We have made modifications in the existing coal gas purification process, and regularly connected the main and standby coal gas coolers to the circulation cleaning system through valve control, and carried out maintenance cleaning on the coal gas cooler to ensure that the coal gas cooler can be operated and used for a long time. Based on this, the utility model provides a heat exchange tube scale cleaning system for the cooler in the coal gas purification process.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a heat exchange tube dirt cleaning system of a cooler in a gas purification process, comprising a horizontal tube gas cooler, a first manual shut-off valve is respectively provided on the cooling inlet and outlet water pipelines of the horizontal tube gas cooler, a first manual control valve is respectively provided on the gas inlet and outlet pipelines of the horizontal tube gas cooler, a partition is provided inside a cleaning water tank, and a water outlet and a water inlet are respectively provided on the cleaning water tank located on both sides of the partition, the water outlet of the cleaning water tank is connected with the inlet of a cleaning water pump through a first cleaning water supply pipeline, a second manual shut-off valve is provided on the water outlet, the outlet of the cleaning water pump is connected with the cooling water inlet pipe of the horizontal tube gas cooler through the second cleaning water supply pipeline, the cooling water outlet pipe of the horizontal tube gas cooler is connected with the water inlet of the cleaning water tank through a cleaning water return pipeline, and a third manual shut-off valve is provided on the water inlet to form a circulating flushing system.

[0008] As a further supplement to the above technical solution, a sewage outlet is provided at the bottom of the cleaning water tank on one side of the water inlet, and a slide is provided in the cleaning water tank. The sewage outlet is located above the slide and is connected to the biochemical treatment system through a sewage pipeline. A manual sewage valve is provided on the sewage pipeline. The manual sewage valve is opened periodically to discharge the precipitated dirt in the cleaning water tank to the biochemical treatment system for treatment.

[0009] As a further supplement to the above technical solution, a water replenishment port is provided on the cleaning water tank, and a water receiving plate and a baffle are respectively provided in the cleaning water tank, the water receiving plate and the baffle are arranged vertically and there is a water flow gap between the two, the water receiving plate is located below the water replenishment port, and it is arranged higher than the top of the partition, the water replenishment port is connected to the water supply pipe of the industrial water system through a water replenishment pipeline, and a second manual control valve is provided on the water replenishment pipeline, and the second manual control valve is opened periodically to replenish industrial water in the cleaning water tank, thereby ensuring the normal operation of the circulating flushing system.

[0010] As a further supplement to the above technical solution, a liquid level transmitter is installed on the cleaning water tank through an instrument interface, and the liquid level transmitter is located on one side of the water outlet. An automatic control valve is arranged on the water replenishment pipeline, and the automatic control valve forms a liquid level interlocking control through a DCS control system and a liquid level signal collected by the liquid level transmitter to realize automatic water replenishment.

[0011] As a further supplement to the above technical solution, a dosing port is provided on the cleaning water tank, and the dosing port is located directly above the water receiving plate, and is connected to the chemical storage tank through a dosing pipeline, and a third manual control valve is provided on the dosing pipeline. The third manual control valve is opened to add acidic cleaning agent, corrosion inhibitor and defoaming agent to the cleaning water tank when replacing or replenishing flushing water, so as to facilitate more thorough cleaning of the horizontal tube gas cooler.

[0012] As a further supplementary explanation of the above technical solution, a sampling pipeline is arranged on the cleaning water return pipeline, and a manual sampling valve is arranged on the sampling pipeline.

[0013] As a further supplement to the above technical solution, a first pressure gauge and a first manual shut-off valve are respectively provided on the first cleaning water supply pipeline, and a second pressure gauge and a second manual shut-off valve are respectively provided on the second cleaning water supply pipeline. The first manual shut-off valve and the second manual shut-off valve are used to cut off the connection between the circulating flushing system and the horizontal tube gas cooler, so as to ensure the normal operation of the horizontal tube gas cooler.

[0014] As a further supplement to the above technical solution, a check valve is provided at the inlet of the cleaning water pump, and the check valve is used to prevent cooling water or flushing water from backflowing and damaging equipment.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. The utility model uses a cleaning water pump to regularly circulate the flushing water in the cleaning water tank to the cooling water pipe bundle of the horizontal tube type gas cooler, flushes and removes the scaling materials on the inner wall, realizes maintenance cleaning of the gas cooler, ensures that the gas cooler can be used for a long time, and is flexible and convenient to operate. At the same time, a partition is added to the cleaning water tank to separate the scale and the cleaning water, which is easy to operate, uses less water, and generates less cleaning sewage. Therefore, the heat exchange tube dirt cleaning system has the advantages of low cleaning cost and good environmental performance.

[0017] 2. The utility model can ensure that the dirt at the bottom of the cleaning tank can be quickly and effectively discharged when replacing industrial water through the optimized design of the slide plate, baffle and other structures. This design not only improves the cleaning efficiency, but also ensures the continuous and efficient operation of the equipment.

[0018] 3. The utility model realizes the automatic control of the water replenishment process by installing a liquid level transmitter on the cleaning water tank and setting an automatic control valve on the water replenishment pipeline, and performing liquid level interlocking control through the DCS control system. This not only improves the operating efficiency, but also ensures the safety and stability of the water replenishment process.

[0019] 4. The additional dosing port and the dosing pipeline connected thereto of the utility model can be used to add appropriate acid cleaning agents, corrosion inhibitors, defoaming agents and other chemical additives through the dosing pipeline configuration when there is a lot of scaling in the cooling water tube bundle of the horizontal tube type gas cooler and a more thorough cleaning is required, so that the horizontal tube type gas cooler can be cleaned more thoroughly.

[0020] 5. The utility model realizes precise control of the flushing process and equipment protection by arranging a pressure gauge, a manual shut-off valve and a check valve on a specific pipeline. This ensures that the horizontal tube gas cooler can be fully cleaned during the cleaning process and can also ensure normal operation during the non-cleaning time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the heat exchange tube dirt cleaning system in the utility model;

[0022] Figure 2 This is a diagram of the internal structure of the cleaning sink in the utility model.

[0023] In the figure: the horizontal tube gas cooler is 1, the cleaning water tank is 2, the water outlet is 201, the water inlet is 202, the sewage outlet is 203, the water replenishment port is 204, the dosing port is 205, the instrument interface is 206, the partition is 3, the cleaning water pump is 4, the first cleaning water supply pipeline is 5, the second cleaning water supply pipeline is 6, the first manual shut-off valve is 7, the first manual control valve is 8, the cleaning water return pipeline is 9, the second manual shut-off valve is 10, and the third manual shut-off valve is 11. The sewage pipeline is 12, the manual sewage valve is 13, the water supply pipeline is 14, the second manual control valve is 15, the dosing pipeline is 16, the third manual control valve is 17, the sampling pipeline is 18, the manual sampling valve is 19, the liquid level transmitter is 20, the automatic control valve is 21, the check valve is 22, the first pressure gauge is 23, the second pressure gauge is 24, the first manual shut-off valve is 25, the second manual shut-off valve is 26, the slide is 27, the water receiving plate is 28, and the baffle is 29. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical solution of the utility model, the following Figure 1 and 2 According to the design scheme and the on-site transformation, we further illustrate the utility model through six embodiments. Embodiment 1

[0025] As attached Figure 1 and 2As shown, a heat exchange tube dirt cleaning system for a cooler in a gas purification process includes a horizontal tube gas cooler 1 and a partition 3 arranged inside a cleaning water tank 2, and the cleaning water tank 2 located on both sides of the partition 3 is respectively provided with a water outlet 201 and a water inlet 202, the water outlet 201 of the cleaning water tank 2 is connected with the inlet of a cleaning water pump 4 through a first cleaning water supply pipeline 5, and a second manual shut-off valve 10 is arranged on the water outlet 201, and the outlet of the cleaning water pump 4 is connected with the cooling water inlet pipe of the horizontal tube gas cooler 1 through a second cleaning water supply pipeline 6, and the cooling water outlet pipe of the horizontal tube gas cooler 1 is connected with the water inlet 202 of the cleaning water tank 2 through a cleaning water return pipeline 9, and a third manual shut-off valve 11 is arranged on the water inlet 202 to form a circulating flushing system.

[0026] In the above embodiment, in order to further improve the circular flushing system, we respectively set a sewage outlet 203 and a water replenishment outlet 204 on the cleaning water tank 2, and the sewage outlet 203 is located on the side of the water inlet 202. The sewage outlet 203 is connected to the biochemical treatment system through a sewage pipeline 12, and a manual sewage valve 13 is provided on the sewage pipeline 12. The manual sewage valve 13 is opened regularly to discharge the precipitated dirt in the cleaning water tank 2 to the biochemical treatment system for treatment. The water replenishment outlet 204 is connected to the water supply pipe of the industrial water system through a water replenishment pipeline 14, and a second manual control valve 15 is provided on the water replenishment pipeline 14. The second manual control valve 15 is opened regularly to replenish industrial water in the cleaning water tank 2, thereby ensuring the normal operation of the circular flushing system.

[0027] In the improved embodiment of the above-mentioned circulating flushing system, we have made the following more detailed designs for the cleaning sink to ensure the cleanliness and efficient operation of the system.

[0028] The specific implementation is as follows: On the one hand, we carefully set a sewage outlet 203 on the cleaning sink. The sewage outlet 203 is located on one side of the water inlet. The sewage outlet 203 is connected to the biochemical treatment system through a sewage pipeline 12. At the same time, a manual sewage valve 13 is installed on the sewage pipeline 12. By opening this valve regularly, we can easily discharge the dirt in the sink to the biochemical treatment system, thereby achieving environmental protection treatment. On the other hand, in order to maintain the water level and water quality in the sink, we set a water replenishment port 204 on the cleaning sink. This water replenishment port 204 is connected to the water supply pipe of the industrial water system through the water replenishment pipeline 14 to ensure that fresh and clean industrial water can be replenished for the sink at any time. Similarly, on the water replenishment pipeline 14, we also set a second manual control valve 15 so that the valve can be easily opened when necessary to replenish the sink.

[0029] Through the above design, we not only achieve timely drainage and water replenishment of the cleaning tank, but also ensure the normal operation of the entire circulation flushing system. This not only improves the cleanliness and work efficiency of the system, but also helps to protect the environment and the rational use of resources. Embodiment 2

[0030] In order to facilitate sampling needs, as shown in the attached Figure 1 and 2 As shown, we set a sampling line 18 on the cleaning water return line 9, and installed a manual sampling valve 19 on the sampling line 18. Through this design, we can regularly open the manual sampling valve 19 and use the sampling line 18 to obtain water samples from the cleaning water tank 2. Subsequently, these water samples are tested for scale content to accurately understand the cleanliness of the water in the tank and the degree of scale accumulation. Such data not only provides us with a reference for replacing flushing water, but also helps us better understand the maintenance requirements of the cleaning water tank 2 and ensure the normal operation of the entire system. Embodiment 3

[0031] In order to ensure that the dirt at the bottom of the cleaning sink can be discharged smoothly and quickly when the water is replaced, we have carefully optimized the internal structure of the cleaning sink based on the first embodiment.

[0032] As attached Figure 1 and 2 As shown, we have specially introduced three key components: the slide plate 27, the water receiving plate 28 and the baffle plate 29. First, the sewage outlet 203 is set above the slide plate 27. When the sewage outlet is opened, the water flow can drive the dirt to be discharged smoothly along the inclined surface of the slide plate 27. Secondly, the water receiving plate 28 is placed below the water replenishment port 204. The water receiving plate 28 and the baffle plate 29 are designed to be arranged vertically, and a certain water flow gap is left between them. When new industrial water flows in from the water replenishment port, it will first fall on the water receiving plate 28, and then continue to flow and flush the dirt at the bottom according to the water flow path we designed. This can not only effectively prevent the water flow from directly impacting the dirt at the bottom, but also use the flushing force of the water flow to help discharge the dirt along the direction of the slide plate 27. Finally, the water receiving plate 28 is arranged higher than the top of the partition 3. The role of the water receiving plate 28 and the baffle plate 29 is to prevent the water flow from directly impacting the cleaning water containing dirt, thereby ensuring that the dirt can be smoothly separated from the clean water and discharged along the slide plate 27.

[0033] In summary, through this series of optimized designs, we can ensure that when replacing industrial water, the dirt at the bottom of the cleaning sink can be discharged quickly and effectively, thereby keeping the cleaning sink clean and running efficiently. Embodiment 4

[0034] As attached Figure 1 and2 As shown, we install a liquid level transmitter 20 on the cleaning water tank 2 through the instrument interface 206, and the liquid level transmitter 20 is located on one side of the water outlet 201. At the same time, an automatic control valve 21 is set on the water supply pipeline 14. Under the premise that the second manual control valve 15 is opened, the automatic control valve 21 and the liquid level transmitter 20 are interlocked with each other through the DCS control system to control the liquid level. Such a design enables the water supply process to be automated, greatly improving the operating efficiency and safety. Embodiment 5

[0035] As attached Figure 1 and 2 As shown, in this embodiment, we add a dosing port 205 to the cleaning water tank 2. This dosing port 205 is located directly above the water receiving plate 28. Its design makes it more convenient and accurate to add medicine to the cleaning water tank 2. The dosing port 205 is connected to the medicine storage tank through the dosing pipeline 16, forming a fast and direct medicine delivery channel. On the dosing pipeline 16, we installed a third manual control valve 17. This control valve plays a key role in replacing or replenishing flushing water.

[0036] Specifically, when it is necessary to replace the flushing water in the cleaning water tank 2, the on-site personnel can open the third manual control valve 17, and the reagent will flow out from the reagent storage tank through the dosing line 16 and directly added to the cleaning water tank 2 through the dosing port 205. This design not only simplifies the operation process, but also improves the accuracy and efficiency of reagent addition. Embodiment 6

[0037] In order to ensure that the horizontal tube gas cooler 1 can be fully cleaned during the cleaning process and can also ensure normal operation during the non-cleaning time, we designed a circulating flushing system with cut-off and protection functions. The system achieves precise control of the flushing process and equipment protection by setting a pressure gauge, manual cut-off valve and check valve on a specific pipeline.

[0038] like Figure 1 and Figure 2As shown, (i) Pressure monitoring and display: A first pressure gauge 23 is installed on the first cleaning water supply pipeline 5 to monitor the pressure changes of the pipeline in real time to ensure the stability of the water pressure during the flushing process. At the same time, a second pressure gauge 24 is installed on the second cleaning water supply pipeline 6, which has the same function as the first pressure gauge 23, but monitors the pressure of another pipeline. On this basis, a first manual shut-off valve 25 is installed on the first cleaning water supply pipeline 5. When it is necessary to disconnect the connection between the circulating flushing system and the horizontal tube gas cooler 1, this can be achieved by closing this valve. The second manual shut-off valve 26 is installed on the second cleaning water supply pipeline 6, and its function is the same as the first manual shut-off valve 25, but it controls the connection and disconnection of another pipeline. The setting of these two manual shut-off valves provides flexible operability for the system and ensures that the horizontal tube gas cooler 1 can operate normally during non-cleaning time. (ii) We specially set a check valve 22 at the inlet of the cleaning water pump 4. The function of this check valve is to prevent the cooling water or flushing water from flowing back under certain circumstances (such as pump stop, power failure, etc.), thereby protecting the equipment from damage.

[0039] Its working principle: when performing the cleaning operation, we switch the gas purification to the standby horizontal tube gas cooler through the first manual shut-off valve 7 and the first manual control valve 8, start the cleaning water pump 4, and the cleaning water enters the cooling water outlet pipe of the horizontal tube gas cooler through the first cleaning water supply pipeline 5 and the second cleaning water supply pipeline 6, passes through the cooling water bundle inside the horizontal tube gas cooler 1, and returns to the cleaning water return pipe through the cooling water inlet pipe. The cleaning water and the entrained scale are returned to the inlet side of the cleaning water tank 2 through the cleaning water return pipeline 9. Here, the scale and the cleaning water are separated by standing, and the scale sinks to the bottom of the inlet side of the water tank. The clarified cleaning water goes over the partition 3 and enters the outlet side of the water tank. The cleaning cycle is repeated in this way, and the scaling materials on the inner wall of the cooling water bundle of the horizontal tube gas cooler 1 are taken out and deposited at the bottom of the inlet side of the water tank. The water out of the cleaning water return pipe is detected, and the cleaning water pump 4 is stopped when it is confirmed that there is no scale taken out, and the cleaning process is completed.

[0040] The above shows and describes the main features and advantages of the utility model. For those skilled in the art, it is obvious that the specific implementation of the utility model is not limited to the details of the above exemplary embodiments, and the creative ideas and design ideas of the utility model can be realized in other specific forms without departing from the spirit or basic features of the utility model, which should be equivalent to the protection scope disclosed in the technical solution of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the utility model.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A heat exchange tube dirt cleaning system for a cooler in a gas purification process, comprising a horizontal tube type gas cooler (1), wherein a first manual shut-off valve (7) is respectively provided on a cooling water inlet and outlet pipeline of the horizontal tube type gas cooler, and a first manual control valve (8) is respectively provided on a gas inlet and outlet pipeline of the horizontal tube type gas cooler, wherein: A partition (3) is arranged inside the cleaning water tank (2), and a water outlet (201) and a water inlet (202) are arranged on the cleaning water tank (2) located on both sides of the partition (3), respectively. The water outlet (201) of the cleaning water tank (2) is connected to the inlet of the cleaning water pump (4) through a first cleaning water supply pipeline (5), and a second manual shut-off valve (10) is arranged on the water outlet (201). The outlet of the cleaning water pump (4) is connected to the cooling water inlet pipe of the horizontal tube type coal gas cooler (1) through the second cleaning water supply pipeline (6), and the cooling water outlet pipe of the horizontal tube type coal gas cooler (1) is connected to the water inlet (202) of the cleaning water tank (2) through a cleaning water return pipeline (9), and a third manual shut-off valve (11) is arranged on the water inlet (202), thereby forming a circulating flushing system.

2. The heat exchange tube dirt cleaning system of the cooler in the coal gas purification process according to claim 1, characterized in that: A sewage outlet (203) is provided at the bottom of the cleaning water tank (2) located on one side of the water inlet (202); a slide plate (27) is provided in the cleaning water tank (2); the sewage outlet (203) is located above the slide plate (27) and is connected to a biochemical treatment system via a sewage pipeline (12); a manual sewage valve (13) is provided on the sewage pipeline (12); the manual sewage valve (13) is opened regularly to discharge the precipitated dirt in the cleaning water tank (2) to the biochemical treatment system for treatment.

3. The heat exchange tube dirt cleaning system of the cooler in the coal gas purification process according to claim 2, characterized in that: A water replenishment port (204) is provided on the cleaning water tank (2), and a water receiving plate (28) and a baffle (29) are respectively provided in the cleaning water tank (2). The water receiving plate (28) and the baffle (29) are arranged vertically and there is a water flow gap between the two. The water receiving plate (28) is located below the water replenishment port (204) and is arranged higher than the top of the partition (3). The water replenishment port (204) is connected to a water supply pipe of an industrial water system through a water replenishment pipeline (14). A second manual control valve (15) is provided on the water replenishment pipeline (14). The second manual control valve (15) is opened regularly to replenish industrial water in the cleaning water tank (2), thereby ensuring the normal operation of the circulating flushing system.

4. The heat exchange tube dirt cleaning system of the cooler in the coal gas purification process according to claim 3, characterized in that: A liquid level transmitter (20) is installed on the cleaning water tank (2) via an instrument interface (206); the liquid level transmitter (20) is located on one side of the water outlet (201); an automatic control valve (21) is provided on the water replenishment pipeline (14); the automatic control valve (21) forms liquid level interlocking control through a DCS control system and a liquid level signal collected by the liquid level transmitter (20), thereby realizing automatic water replenishment.

5. The heat exchange tube dirt cleaning system of the cooler in the coal gas purification process according to claim 4, characterized in that: A dosing port (205) is provided on the cleaning water tank (2). The dosing port (205) is located directly above the water receiving plate (28) and is connected to a chemical storage tank via a dosing pipeline (16). A third manual control valve (17) is provided on the dosing pipeline (16). When the flushing water is replaced or supplemented, the third manual control valve (17) is opened to add an acidic cleaning agent, a corrosion inhibitor, and a defoaming agent into the cleaning water tank (2), thereby facilitating a more thorough cleaning of the horizontal tube type gas cooler (1).

6. A heat exchange tube dirt cleaning system for a cooler in a coal gas purification process according to any one of claims 2 to 5, characterized in that: A sampling pipeline (18) is provided on the cleaning water return pipeline (9), and a manual sampling valve (19) is provided on the sampling pipeline (18).

7. The heat exchange tube dirt cleaning system of a cooler in a coal gas purification process according to claim 1, characterized in that: A first pressure gauge (23) and a first manual shut-off valve (25) are provided on the first cleaning water supply pipeline (5), and a second pressure gauge (24) and a second manual shut-off valve (26) are provided on the second cleaning water supply pipeline (6). The first manual shut-off valve (25) and the second manual shut-off valve (26) are used to cut off the connection between the circulating flushing system and the horizontal tube type gas cooler (1), thereby ensuring the normal operation of the horizontal tube type gas cooler (1).

8. A heat exchange tube dirt cleaning system for a cooler in a coal gas purification process according to any one of claims 1 to 5 or 7, characterized in that: A check valve (22) is provided at the inlet of the cleaning water pump (4), and the check valve (22) is used to prevent cooling water or flushing water from flowing back and damaging equipment.

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