Tubular heat exchanger shell pass on-line cleaning device

Abstract

The invention belongs to the technical field of heat exchangers, and particularly discloses a tubular heat exchanger shell pass online cleaning device which comprises a liquid inlet valve seat connector close to the heat exchange medium inflow end of a heat exchanger and a liquid outlet valve seat connector close to the heat exchange medium outflow end of the heat exchanger. The other end of the liquid inlet guide pipe is communicated with a cleaning liquid storage tank through a circulating pump, the liquid outlet valve seat connector is communicated with a liquid outlet guide pipe, the other end of the liquid outlet guide pipe is communicated with a filtering structure, the filtering structure is communicated with the cleaning liquid storage tank, and cleaning liquid flows out of the cleaning liquid storage tank. The liquid flows back to the cleaning liquid storage tank after sequentially passing through the circulating pump, the liquid inlet guide pipe, the liquid inlet valve seat connector, the heat exchange medium circulating pipeline, the shell pass of the heat exchanger, the heat exchange medium circulating pipeline, the liquid outlet valve seat connector, the liquid outlet guide pipe and the filtering structure, and a circulating cleaning path is formed. The online cleaning device can be connected in the working process of equipment, online cleaning is achieved, shutdown is not needed, the cleaning efficiency is improved, and the labor intensity is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat exchangers, and particularly relates to an on-line cleaning device for the shell side of a tubular heat exchanger. Background Art

[0002] Existing injection water tubular heat exchangers are composed of components such as a shell, a tube bundle, a tube sheet, and a head. Two fluids with different temperatures, injection water and chilled water, flow in the tube side and the shell side respectively, and heat is transferred from the high-temperature fluid to the low-temperature fluid to achieve the heat exchange effect.

[0003] The long-term circulation of chilled water into the tubular heat exchanger may have the following effects: Scaling: Chilled water may contain trace amounts of calcium, magnesium ions and other impurities. After long-term circulation, these substances may deposit on the surface of the heat exchanger tube bundle to form scale, reducing the heat transfer efficiency.

[0004] Corrosion: If the quality of the chilled water is unstable, such as containing dissolved oxygen, acidic substances or microorganisms, etc., it will corrode the tube bundle material of the heat exchanger, resulting in a reduction in the wall thickness of the tube bundle and affecting the service life of the equipment.

[0005] Microbial growth: The temperature of chilled water is usually suitable for the growth of microorganisms. Long-term circulation will provide a good living environment for microorganisms. The large reproduction of microorganisms will form a biofilm attached to the surface of the tube bundle, which not only affects heat transfer, but may also produce odors, having an adverse effect on the system.

[0006] Increased pressure loss: As the operation time increases, impurities that the chilled water may carry during circulation will gradually deposit in the heat exchanger, resulting in a narrowing of the flow channel and an increase in fluid resistance, thereby increasing the pressure loss of the system and increasing the energy consumption of the circulation pump.

[0007] Change in heat transfer efficiency: Initial increase: In the initial stage of the heat exchanger operation, the temperature of the chilled water is relatively low, and the temperature difference with the hot fluid is relatively large, which is conducive to heat transfer and can effectively reduce the temperature of the hot fluid. Later decrease: However, after long-term operation, due to the influence of factors such as scaling and biofilm, the heat transfer thermal resistance will increase, and the heat transfer efficiency will gradually decrease, affecting the performance of the heat exchanger.

[0008] Therefore, it is necessary to regularly clean the shell side of the tubular heat exchanger to ensure the performance and service life of the heat exchanger. The traditional shell side cleaning operation of the heat exchanger usually disassembles the heat exchanger from the equipment or the support and transfers it to an open and safe area for cleaning. Due to the heavy weight of the heat exchanger, a large amount of manpower and time are required, the cleaning efficiency is low, the labor intensity is high, and the disassembly and assembly process is prone to events such as unplanned leakage, delaying the production plan.

[0009] In order to solve the problems of low efficiency and high labor intensity in the cleaning method of the shell side of heat exchangers in the prior art, it is necessary to improve the structure of the cleaning device to solve the current technical problems. Summary of the Invention

[0010] The object of the present invention is to provide an on-line cleaning device for the shell side of a tubular heat exchanger, which can be connected to the cleaning structure of the present application for on-line cleaning during the operation of the equipment, without shutting down the machine, improving the cleaning efficiency and reducing the labor intensity.

[0011] To achieve the above object, the present invention adopts the following technical solutions: An on-line cleaning device for the shell side of a tubular heat exchanger includes a liquid inlet valve seat connector and a liquid outlet valve seat connector installed on the heat transfer medium circulation pipeline. The liquid inlet valve seat connector is close to the heat transfer medium inlet end of the heat exchanger, and the liquid outlet valve seat connector is close to the heat transfer medium outlet end of the heat exchanger. The liquid inlet valve seat connector is connected to a liquid inlet conduit, and the other end of the liquid inlet conduit is connected to a cleaning liquid storage tank through a circulation pump. The liquid outlet valve seat connector is connected to a liquid outlet conduit, and the other end of the liquid outlet conduit is connected to a filtering structure, and the filtering structure is connected to the cleaning liquid storage tank. The cleaning liquid flows out from the cleaning liquid storage tank, successively passes through the circulation pump, the liquid inlet conduit, the liquid inlet valve seat connector, the heat transfer medium circulation pipeline, the heat exchanger, the heat transfer medium circulation pipeline, the liquid outlet valve seat connector, the liquid outlet conduit and the filtering structure, and then flows back to the cleaning liquid storage tank to form a circulating cleaning path.

[0012] To better implement the present invention, both the liquid inlet conduit and the liquid outlet conduit adopt a hose structure.

[0013] To better implement the present invention, two first control valves are provided on the heat transfer medium circulation pipeline, and the two first control valves are respectively close to the liquid inlet valve seat connector and the liquid outlet valve seat connector.

[0014] To better implement the present invention, the filtering structure includes a filter, the filter has a liquid inlet, a liquid outlet and a sewage outlet, the liquid outlet conduit is connected to the liquid inlet, and the liquid outlet is connected to a return pipe; the sewage outlet is arranged at the bottom of the filter and is connected to a sewage valve, the sewage valve is connected to a sewage pipe, and the sewage pipe is connected to a treatment tank; The treatment tank is connected to a liquid supplement pipe through a water pump, and the other end of the liquid supplement pipe is connected to the cleaning liquid storage tank.

[0015] To better implement the present invention, an on-line cleaning liquid analyzer and a second control valve are provided on the return pipe. The on-line cleaning liquid analyzer is close to the filter, a drain branch pipe is connected to the return pipe between the on-line cleaning liquid analyzer and the second control valve, a third control valve is provided on the drain branch pipe, and the drain branch pipe is connected to the treatment tank.

[0016] To better implement the present invention, the filter is a hollow cylindrical structure. A partition is provided inside the filter. The liquid inlet is opened at the lower layer of the partition, and the liquid outlet is opened at the upper layer of the partition. The partition is provided with a plurality of through holes along the circumferential direction. A filter screen is fixedly connected to the top of each through hole. The filter screen is a cylindrical structure with an open bottom.

[0017] To better implement the present invention, the filter screen is composed of an inner stainless steel sintered mesh and an outer stainless steel sintered felt sleeved together. The pore size of the stainless steel sintered mesh is 100 - 500 microns; the pore size of the stainless steel sintered felt is 1 - 20 microns.

[0018] To better implement the present invention, the sewage discharge valve includes a first pipe section rotatably connected inside the sewage discharge port and a second pipe section slidably inserted inside the first pipe section; A toothed ring is provided at the bottom end of the first pipe section. The toothed ring meshes with a gear, and the gear is connected to the driving shaft of the motor. At least one diversion suction cup is connected to the top end of the first pipe section. The inlet diameter of the diversion suction cup is not less than the diameter of the through hole. A plurality of diversion holes are provided on the side wall of the first pipe section; A valve is provided at the bottom end of the second pipe section. A telescopic cylinder is connected between the outer shell of the valve and the toothed ring.

[0019] To better implement the present invention, a liquid level sensor, a temperature sensor, and a heater are provided inside the cleaning liquid storage tank.

[0020] To better implement the present invention, the cleaning liquid storage tank has a double-layer structure. The inner layer is made of stainless steel, and the outer layer is a heat insulation layer.

[0021] Beneficial effects: First, according to the scaling type and material of the shell side of the heat exchanger, the present invention selects a suitable environment-friendly chemical cleaning agent to prepare a cleaning liquid, which is then filled in the cleaning liquid storage tank. Then, the intelligent circulation pump is started, and the cleaning liquid is pumped through the liquid inlet conduit to the valve seat connector and flows into the shell side of the heat exchanger through the heat transfer medium circulation pipeline for cleaning. The sewage after cleaning flows through the heat transfer medium circulation pipeline to the liquid outlet valve seat connector and then flows into the filtering structure through the liquid outlet conduit for filtering. The filtered liquid can partially flow back into the cleaning liquid storage tank for reuse. By setting two valve seat connectors, the cleaning structure of the present application can be connected during the operation of the equipment for on-line cleaning without shutting down the machine, improving the cleaning efficiency and reducing the labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the working principle diagram of the on-line cleaning device of the present invention; Figure 2 It is the structural diagram of the filter of the present invention; Figure 3Structural diagram of the cleaning storage tank for the present invention.

[0023] In the figure: 1. Heat exchange medium circulation pipeline; 101. First control valve; 2. Liquid inlet valve seat connector; 3. Liquid outlet valve seat connector; 4. Heat exchanger; 5. Liquid inlet conduit; 6. Circulation pump; 7. Cleaning liquid storage tank; 701. Liquid level sensor; 702. Temperature sensor; 703. Heater; 704. Stainless steel; 705. Thermal insulation layer; 8. Liquid outlet conduit; 9. Filter structure; 901. Filter; 9011. Liquid inlet; 9012. Liquid outlet; 9013. Drain port; 9014. Partition; 9015. Through hole; 9016. Stainless steel sintered mesh; 9017. Stainless steel sintered felt; 902. Return pipe; 903. Online cleaning liquid analyzer; 904. Second control valve; 905. Drain pipe; 906. Drain valve; 9061. First pipe section; 9062. Second pipe section; 9063. Tooth ring; 9064. Gear; 9065. Motor; 9066. Flow guiding suction cup; 9067. Flow guiding hole; 9068. Valve; 9069. Telescopic cylinder; 907. Treatment tank; 908. Drainage branch pipe; 909. Third control valve; 910. Liquid supplement pipe; 911. Water pump. Detailed implementation mode

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment As Figures 1 - 3 shown, an on-line cleaning device for the shell side of a tubular heat exchanger includes a liquid inlet valve seat connector 2 and a liquid outlet valve seat connector 3 installed on the heat exchange medium circulation pipeline 1. The liquid inlet valve seat connector 2 is close to the heat exchange medium inlet end of the heat exchanger 4, and the liquid outlet valve seat connector 3 is close to the heat exchange medium outlet end of the heat exchanger 4. The liquid inlet valve seat connector 2 is connected to a liquid inlet conduit 5, and the other end of the liquid inlet conduit 5 is connected to a cleaning liquid storage tank 7 through a circulation pump 6. The circulation pump 6 uses a starting diaphragm pump. The liquid outlet valve seat connector 3 is connected to a liquid outlet conduit 8, and the other end of the liquid outlet conduit 8 is connected to a filter structure 9. The filter structure 9 is connected to the cleaning liquid storage tank 7. The cleaning liquid flows out of the cleaning liquid storage tank 7, passes through the circulation pump 6, the liquid inlet conduit 5, the liquid inlet valve seat connector 2, the heat exchange medium circulation pipeline 1, the heat exchanger 4, the heat exchange medium circulation pipeline 1, the liquid outlet valve seat connector 3, the liquid outlet conduit 8 and the filter structure 9 in sequence, and then flows back to the cleaning liquid storage tank 7 to form a circulating cleaning path.

[0026] The working principle of the present invention is outlined as: First, select a suitable environmentally friendly chemical cleaning agent according to the scaling type and material of the shell side of the heat exchanger 4. The cleaning agent adopts a biodegradable formula, which is environmentally friendly and does not corrode the material of the heat exchanger 4. Mix the cleaning agent with purified water in a certain proportion to prepare a cleaning solution, and fill it in the cleaning solution storage tank 7. Start the intelligent circulation pump 6, pump the cleaning solution through the liquid inlet conduit 5 to the valve seat connector, and flow into the shell side of the heat exchanger 4 through the heat transfer medium circulation pipeline 1 for cleaning. The sewage after cleaning flows through the heat transfer medium circulation pipeline 1 to the liquid outlet valve seat connector 3, and flows into the filtration structure 9 through the liquid outlet conduit 8 for filtration. The filtered liquid can flow back into the cleaning solution storage tank 7 for reuse. By setting two valve seat connectors, the cleaning structure of the present application can be connected for on-line cleaning during the operation of the equipment without stopping the machine, improving the cleaning efficiency and reducing the labor intensity.

[0027] Preferably, both the liquid inlet conduit 5 and the liquid outlet conduit 8 adopt a hose structure. This facilitates the flexible adjustment of the installation positions of the cleaning solution storage tank 7 and the filtration structure 9.

[0028] Preferably, two first control valves 101 are provided on the heat transfer medium circulation pipeline 1, and the two first control valves 101 are respectively close to the liquid inlet valve seat connector 2 and the liquid outlet valve seat connector 3. After the circulation pump 6 is turned on, close the two first control valves 101 to prevent the cleaning solution from entering other components such as the condenser through the heat transfer medium circulation pipeline 1 and causing equipment damage.

[0029] Preferably, the filtration structure 9 includes a filter 901. The filter 901 has a liquid inlet 9011, a liquid outlet 9012 and a sewage outlet 9013. The liquid outlet conduit 8 is connected to the liquid inlet 9011, and the liquid outlet 9012 is connected with a return pipe 902; the sewage outlet 9013 is arranged at the bottom of the filter 901 and is connected with a sewage valve 906. The sewage valve 906 is connected with a sewage pipe 905, and the sewage pipe 905 is connected with a treatment tank 907. The sewage is discharged into the filter 901 through the liquid outlet conduit 8 and the liquid inlet 9011 for filtration. After the filtration is completed, the clean water flows back to the cleaning solution storage tank 7 through the liquid outlet 9012 and the return pipe 902 for reuse. Open the sewage valve 906 regularly to discharge the sundries generated by filtration into the treatment tank 907 through the sewage pipe 905 for further treatment.

[0030] The treatment tank 907 is connected with a liquid supplement pipe 910 through a water pump 911. The other end of the liquid supplement pipe 910 is connected to the cleaning solution storage tank 7. The treatment tank 907 adopts chemical precipitation and activated carbon adsorption methods to treat the waste liquid, remove harmful components, make the waste liquid meet the discharge standard, and part of the treated waste liquid flows back to the cleaning solution storage tank 7 through the water pump 911 and the liquid supplement pipe 910 for the preparation of the cleaning solution, reducing water resource waste.

[0031] Preferably, the reflux pipe 902 is provided with an on-line cleaning liquid analyzer 903 and a second control valve 904. The on-line cleaning liquid analyzer 903 is close to the filter 901. A drain branch pipe 908 is connected to the reflux pipe 902 between the on-line cleaning liquid analyzer 903 and the second control valve 904. A third control valve 909 is installed on the drain branch pipe 908, and the drain branch pipe 908 is connected to the treatment tank 907. The on-line cleaning liquid analyzer 903 monitors the pH value, conductivity and chemical composition of the cleaning liquid in real time. If the cleaning liquid filtered by the filter 901 can meet the standard for direct utilization, the second control valve 904 is opened and the third control valve 909 is closed, and the filtered liquid is directly refluxed to the cleaning liquid storage tank 7 for circulating cleaning. The staff can also judge the cleaning effect and whether it is necessary to continue adding cleaning agents according to the pH value, conductivity and chemical composition of the cleaning liquid. If it has been cleaned, the pH value, conductivity and chemical composition of the cleaning liquid monitored by the on-line cleaning liquid analyzer 903 should not be much different from the configured cleaning liquid. Then the second control valve 904 can be closed and the third control valve 909 can be opened to discharge the cleaning liquid in the pipeline into the treatment tank 907. At the same time, the circulation pump 6 is closed, and the first control valves 101 close to the liquid inlet valve seat connector 2 and the liquid outlet valve seat connector 3 are opened in sequence to enable the heat exchange medium to re-enter the circulation for continuous heat exchange work.

[0032] Preferably, the filter 901 is a hollow cylindrical structure. A partition 9014 is provided inside the filter 901. The liquid inlet 9011 is opened on the lower layer of the partition 9014, and the liquid outlet 9012 is opened on the upper layer of the partition 9014. The partition 9014 is provided with a plurality of through holes 9015 along the circumferential direction. A filter screen is fixedly connected to the top of each through hole 9015. The filter screen is a cylindrical structure with an open bottom. The treated sewage enters the filter 901 from the liquid inlet 9011, then gradually fills the filter 901 upward, and is discharged from the liquid outlet 9012 after being filtered by a plurality of filter screens. Setting the liquid inlet 9011 at the bottom of the filter 901 can minimize the fluctuation of the sewage. Moreover, the weight of the dirt is usually heavier than that of water and will sink automatically, which can also reduce the burden on the filter screen and improve the filtering effect.

[0033] Preferably, the filter screen is composed of an inner stainless steel sintered mesh 9016 and an outer stainless steel sintered felt 9017 sleeved together. The aperture of the stainless steel sintered mesh 9016 is 100-500 microns, which is mainly used to remove large particle impurities such as rust and sand grains. The aperture of the stainless steel sintered felt 9017 is 1-20 microns, which is used to remove tiny particles such as microorganisms and colloidal particles.

[0034] Preferably, the sewage valve 906 includes a first pipe section 9061 rotatably connected to the sewage outlet 9013 and a second pipe section 9062 slidably plugged into the first pipe section 9061; a toothed ring 9063 is provided at the bottom end of the first pipe section 9061, and a gear 9064 is meshed with the toothed ring 9063, and the gear 9064 is connected to the drive shaft of the motor 9065. The top end of the first pipe section 9061 is connected to at least one guide suction cup 9066, and the inlet diameter of the guide suction cup 9066 is not less than the diameter of the through hole 9015. The side wall of the first pipe section 9061 is provided with a plurality of guide holes 9067; a valve 9068 is provided at the bottom end of the second pipe section 9062, and a telescopic cylinder 9069 is connected between the outer shell of the valve 9068 and the toothed ring 9063. The filter screen will inevitably accumulate dirt after long-term use, which will affect the filtering effect, so it needs to be backwashed regularly. The specific principle of backwashing is as follows: First, the gear 9064 is driven to rotate by the motor 9065. Under the transmission of the gear ring 9063, the first pipe section 9061 rotates, driving the guide suction cup 9066 to connect to any through hole 9015. At the same time, the second pipe section 9062 is moved up by the telescopic cylinder 9069 to block the multiple guide holes 9067, and the valve 9068 is opened. The through hole 9015 corresponding to the guide suction cup 9066 will form a reverse flow of liquid, and a negative pressure will be formed inside the corresponding filter. The liquid on the upper layer of the partition 9014 will be reversely poured into the filter, and then flow out from the guide suction cup 9066, the first pipe section 9061, and the second pipe section 9062. In this process, the dirt accumulated on the filter will also be discharged under the action of the reverse flow and negative pressure, thereby achieving the effect of reverse flushing the filter.

[0035] When it is necessary to clean the dirt deposited in the filter 901, firstly, the second pipe section 9062 is moved downward by the telescopic cylinder 9069 to fully expose the guide hole 9067, and then the valve 9068 is opened, and the dirt will flow into the second pipe section 9062 from the guide hole 9067 and be discharged.

[0036] Preferably, a liquid level sensor 701, a temperature sensor 702 and a heater 703 are provided in the cleaning liquid storage tank 7. Electric heating is adopted and a PID temperature controller is equipped to accurately control the temperature of the cleaning liquid. The heater 703 has a built-in overheat protection device to prevent dry burning damage; the storage tank has a built-in liquid level sensor 701 and a temperature sensor 702 to monitor the liquid level and temperature of the cleaning liquid in real time to ensure the best cleaning effect.

[0037] Preferably, the cleaning liquid storage tank 7 has a double-layer structure, the inner layer is 316L stainless steel 704, the inner surface is electrolytically polished to reduce dirt adhesion, and the outer layer is a heat-insulating layer 705 to prevent heat loss of the cleaning liquid. Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An on-line cleaning device for the shell side of a tubular heat exchanger, characterized in that, It includes an inlet valve seat connector (2) and an outlet valve seat connector (3) installed on the heat exchange medium circulation pipeline (1). The inlet valve seat connector (2) is close to the heat exchange medium inlet end of the heat exchanger (4), and the outlet valve seat connector (3) is close to the heat exchange medium outlet end of the heat exchanger (4). The inlet valve seat connector (2) is connected to an inlet conduit (5), and the other end of the inlet conduit (5) is connected to a cleaning liquid storage tank (7) through a circulation pump (6). The outlet valve seat connector (3) is connected to an outlet conduit (8), and the other end of the outlet conduit (8) is connected to a filtering structure (9). The filtering structure (9) is connected to the cleaning liquid storage tank (7). The cleaning liquid flows out from the cleaning liquid storage tank (7), successively passes through the circulation pump (6), the inlet conduit (5), the inlet valve seat connector (2), the heat exchange medium circulation pipeline (1), the shell side of the heat exchanger (4), the heat exchange medium circulation pipeline (1), the outlet valve seat connector (3), the outlet conduit (8) and the filtering structure (9), and then flows back to the cleaning liquid storage tank (7) to form a circulating cleaning path.

2. The on-line cleaning device for the shell side of a tubular heat exchanger according to claim 1, characterized in that, Both the inlet conduit (5) and the outlet conduit (8) adopt a hose structure.

3. The on-line cleaning device for the shell side of a tubular heat exchanger according to claim 1, characterized in that, Two first control valves (101) are provided on the heat exchange medium circulation pipeline (1), and the two first control valves (101) are respectively close to the inlet valve seat connector (2) and the outlet valve seat connector (3).

4. The on-line cleaning device for the shell side of a tubular heat exchanger according to claim 1, characterized in that, The filtering structure (9) includes a filter (901). The filter (901) has an inlet (9011), an outlet (9012) and a sewage outlet (9013). The outlet conduit (8) is connected to the inlet (9011), and the outlet (9012) is connected to a return pipe (902). The sewage outlet (9013) is arranged at the bottom of the filter (901) and is connected to a sewage valve (906). The sewage valve (906) is connected to a sewage pipe (905), and the sewage pipe (905) is connected to a treatment tank (907). The treatment tank (907) is connected to a replenishing pipe (910) through a water pump (911), and the other end of the replenishing pipe (910) is connected to the cleaning liquid storage tank (7).

5. An on-line cleaning device for the shell side of a tubular heat exchanger according to claim 4, characterized in that, The return pipe (902) is provided with an online cleaning liquid analyzer (903) and a second control valve (904). The online cleaning liquid analyzer (903) is close to the filter (901). A drain branch pipe (908) is connected to the return pipe (902) between the online cleaning liquid analyzer (903) and the second control valve (904). The drain branch pipe (908) is provided with a third control valve (909), and the drain branch pipe (908) is connected to the treatment tank (907).

6. The on-line cleaning device for the shell side of a tubular heat exchanger according to claim 4, characterized in that, The filter (901) is a hollow cylindrical structure. A partition plate (9014) is provided inside the filter (901). The liquid inlet (9011) is opened at the lower layer of the partition plate (9014), and the liquid outlet (9012) is opened at the upper layer of the partition plate (9014). The partition plate (9014) is provided with a plurality of through holes (9015) along the circumferential direction. A filter screen is fixedly connected to the top of each through hole (9015). The filter screen is a cylindrical structure with an open bottom.

7. An on-line cleaning device for the shell side of a tubular heat exchanger according to claim 6, characterized in that, The filter screen is composed of an inner stainless steel sintered mesh (9016) and an outer stainless steel sintered felt (9017) sleeved together. The aperture of the stainless steel sintered mesh (9016) is 100 - 500 microns; the aperture of the stainless steel sintered felt (9017) is 1 - 20 microns.

8. An on-line cleaning device for the shell side of a tubular heat exchanger according to claim 6, characterized in that, The drain valve (906) includes a first pipe section (9061) rotatably connected inside the drain port (9013) and a second pipe section (9062) slidably inserted inside the first pipe section (9061); A toothed ring (9063) is provided at the bottom end of the first pipe section (9061). The toothed ring (9063) meshes with a gear (9064). The gear (9064) is connected to the drive shaft of the motor (9065). At least one diversion suction cup (9066) is connected to the top end of the first pipe section (9061). The inlet diameter of the diversion suction cup (9066) is not less than the diameter of the through hole (9015). A plurality of diversion holes (9067) are provided on the side wall of the first pipe section (9061); A valve (9068) is provided at the bottom end of the second pipe section (9062). An expansion cylinder (9069) is connected between the outer shell of the valve (9068) and the toothed ring (9063).

9. An on-line cleaning device for the shell side of a tubular heat exchanger according to claim 1, characterized in that, A liquid level sensor (701), a temperature sensor (702) and a heater (703) are provided inside the cleaning liquid storage tank (7).

10. The on-line cleaning device for the shell side of a tubular heat exchanger according to claim 1, characterized in that, The cleaning liquid storage tank (7) has a double-layer structure. The inner layer is made of stainless steel (704), and the outer layer is a heat insulation layer (705).

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