Large storage tank rotational flow flushing anti-accumulation device and method

Abstract

The invention relates to an anti-accumulation device and method for rotational flow flushing of a large storage tank. The device comprises a flushing header pipe, a flushing valve, a three-way pipe, a main flushing pipeline, a flushing flowmeter, an electric valve, a manual valve, a large storage tank, a flushing branch pipe, a branch pipe nozzle, a water inlet branch pipe, a support, a disturbance nozzle, a spray hole, a nozzle, a water flow tangent baffle, a water inlet flowmeter, a water inlet valve, a water inlet header pipe, a blow-down valve, a water outlet pipeline, a water outlet valve, a water outlet flowmeter, a water outlet pump and a monitoring management system. The method comprises the following steps: S1, equipment installation; s2, starting up and running; s3, monitoring and adjusting; and S4, maintenance work is carried out. Compared with an existing device, the anti-accumulation efficiency can be improved, the safety risk is reduced, the potential safety hazard is reduced, the economic investment is reduced, and the continuous, efficient and automatic anti-accumulation effect of the brine storage tank is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of salt cavern gas storage, relates to large storage tanks, and specifically relates to a swirling flushing anti-accumulation device and method for large storage tanks. Background Art

[0002] At present, China is vigorously promoting the construction of oil and gas strategic reserve facilities, and the salt cavern gas storage technology has emerged as the times require. The salt cavern gas storage cavity formation usually adopts the water solution cavity formation method. The surplus fresh brine produced by salt-making enterprises can be injected into the salt layer for water solution cavity formation, which can effectively improve economic benefits and environmental protection levels. Before the fresh brine is injected into the salt layer, corresponding large storage tanks are needed for temporary storage. However, the fresh brine often contains components such as CaSO4 and suspended insoluble substances, which easily cause the accumulation of insoluble substances in the storage tank, occupying the volume of the storage tank, blocking the outlet pipeline, and at the same time making it difficult to start the outlet water pump; large storage tanks in China also face the problem of accumulation caused by the precipitation of insoluble impurities in the storage medium. At present, the domestic methods for dealing with the accumulation of insoluble substances in large storage tanks mainly include mechanical cleaning, chemical treatment, automatic anti-deposition, etc. However, the existing technologies still have the following problems: Mechanical cleaning methods such as manual tank cleaning, sludge scraper, and high-pressure water jet often require frequent shutdowns and production halts, and require operators to enter the tank for cleaning, which have problems such as low efficiency and high safety risks.

[0003] Chemical treatment methods such as chemical agents or biodegradation can dissolve or disperse precipitates, but there are potential hazards in the field of edible salt production and environmental protection, and subsequent disposal costs need to be increased.

[0004] Common intelligent tank cleaning robots, tank bottom agitators, and ultrasonic anti-deposition technologies in automatic anti-accumulation technologies all have problems such as high cost, complex technology, easy damage of components, and high maintenance costs.

[0005] For the above reasons, there is an urgent need for a swirling flushing anti-accumulation device and method for large storage tanks to improve the anti-accumulation efficiency, reduce safety risks, reduce environmental protection hazards, reduce economic investment, and achieve continuous, efficient, and automatic anti-accumulation effects for large storage tanks. Summary of the Invention

[0006] The present invention solves the problems of low efficiency, high risk, large hidden danger, and high cost of the existing technology through a swirling flushing anti-accumulation device and method for large storage tanks.

[0007] To achieve the above object, the present invention adopts the following technical solution: A large storage tank swirl flushing anti-accumulation device, including a flushing main pipe, on which a flushing valve is installed. One end of the flushing main pipe is connected to the water outlet pipe, and the other end is connected to one end of a tee pipe. The remaining two ends of the tee pipe are connected with two main flushing pipes. From the tee pipe to the tank wall of the large storage tank, a flushing flowmeter, an electric valve, and a manual valve are successively installed on the two main flushing pipes. The two main flushing pipes pass through the lower part of the large storage tank and extend into the large storage tank and reach the opposite tank wall. After passing through the opposite tank wall, a sewage valve is connected. A plurality of flushing branch pipes are respectively installed on both sides of the main flushing pipes. The flushing branch pipes extend radially. A branch nozzle is installed on the right side of the flushing branch pipe, arranged in a clockwise direction. The inlet flowmeter is connected to the inlet valve through the inlet main pipe. The inlet main pipe is connected to the top of the large storage tank. After entering the large storage tank, it is divided into two inlet branch pipes. The inlet branch pipes extend to the bottom of the large storage tank and extend horizontally in a clockwise direction at the end. The water outlet pipe is connected to the lower part of the large storage tank. An outlet valve, an outlet flowmeter, and an outlet water pump are successively installed on the water outlet pipe. After the outlet of the outlet water pump of the water outlet pipe, it is connected to the flushing main pipe; a disturbance nozzle is installed on the flushing branch pipe near the water outlet pipe. Spray holes are opened on the pipe of the disturbance nozzle, and the end spray port sprays upward. A water flow tangent baffle is installed at the spray port. The monitoring and control system is connected to the flushing flowmeter, the inlet flowmeter, the outlet flowmeter, the large storage tank, and the electric valve through wires.

[0008] On the basis of the above solution, preferably, a number of tee pipes are installed on the flushing main pipe. Each tee pipe is provided with a large storage tank disturbance nozzle corresponding to it in the area near the outlet valve; the flushing branch pipe shall not be directly set in front of the outlet of the inlet branch pipe to avoid damage to the flushing branch pipe and the branch nozzle caused by excessive inlet potential energy.

[0009] On the basis of the above solution, preferably, the diameters of the flushing water pipe, the flushing main pipe, and the main flushing pipe are 219 mm, the diameter of the flushing branch pipe is 101 mm, the diameter of the branch nozzle is 45 mm, the distance between the end of the flushing branch pipe and the tank wall is 2 m, and the distance between the outlet of the inlet branch pipe and the tank wall is 1 m; the connection between the main flushing pipe and the tank wall of the large storage tank is circularly reinforced with a radius of 200 mm centered on the center line of the main flushing pipe to prevent the sealing failure at the connection due to pipe vibration.

[0010] On the basis of the above solution, preferably, the horizontal extension direction of the branch nozzle is perpendicular to the extension direction of the flushing branch pipe. The branch nozzle is inclined downward by 10° in the vertical direction. The length of the spray pipe is 300 mm. The diameter of the disturbance nozzle is 101 mm. The spray holes on the pipe of the disturbance nozzle are inclined at 45° to both sides. The diameter of the spray holes is 15 mm. The distance between the spray holes is 200 mm, and there are 8 in total. The diameter of the end spray port is 45 mm, spraying upward. The water flow tangent baffle at the spray port is 10 mm thick.

[0011] On the basis of the above solution, preferably, the inlet branch pipe, the main flushing pipeline, the flushing branch pipe and the disturbance nozzles are all fixed to the bracket by hoop, and the bracket is in the shape of a gantry; the height of the inlet branch pipe bracket from the bottom of the tank is 300 mm, the height of the main flushing pipeline bracket from the bottom of the tank is 300 mm, and the height of the flushing branch pipe and the disturbance nozzle bracket from the bottom of the tank is 359 mm; the inlet branch pipe bracket is perpendicular to the outlet direction of the inlet branch pipe, the main flushing pipeline bracket is perpendicular to the main flushing pipeline direction, and the flushing branch pipe bracket is arranged parallel to the branch nozzle direction of its respective flushing branch pipe to reduce the resistance of the bracket to the brine; the height of the outlet pipeline from the bottom of the tank is 300 mm.

[0012] A method for preventing accumulation by swirling flushing of a large storage tank is realized by using a device for preventing accumulation by swirling flushing of a large storage tank, and includes the following steps: S1. Equipment installation; S2. Start-up and operation; S3. Monitoring and adjustment; S4. Maintenance work.

[0013] On the basis of the above solution, preferably, the specific steps of S1 are as follows: sequentially connect the flushing main pipe, the flushing valve, the three-way pipe, the main flushing pipeline, the flushing flowmeter, the electric valve, the manual valve, the large storage tank, the flushing branch pipe, the branch nozzle, the inlet branch pipe, the bracket, the disturbance nozzle, the spray hole, the spray port, the water flow tangent baffle, the inlet flowmeter, the inlet valve, the inlet main pipe, the sewage discharge valve, the outlet pipeline, the outlet valve, the outlet flowmeter, and the outlet water pump; connect the monitoring and control system to the flushing flowmeter, the inlet flowmeter, the outlet flowmeter, the large storage tank and the electric valve through wires; to prevent the corrosion of the whole device by the brine, all the pipelines, nozzles, brackets in the tank and the tank wall are coated with polyurea anti-corrosion layer, which is sprayed three times with primer, intermediate coating and topcoat, and after each spraying, drying treatment is carried out, and drying for at least 24 h is carried out before the next spraying; according to the volume of the large storage tank, the inlet flow rate, the outlet flow rate, the brine concentration, and the insoluble content parameters, calculate the flushing flow rate.

[0014] On the basis of the above solution, preferably, the specific steps of S2 are as follows: close the sewage discharge valve, close the outlet valve, close the flushing valve, open the inlet valve, the inlet water enters the large storage tank through the inlet main pipe and the inlet branch pipe and forms a swirl, open the outlet valve, open the outlet water pump, open the electric valve, open the flushing valve, open the flushing valve, a part of the outlet water pumped by the outlet water pump is used as flushing water and sequentially passes through the flushing valve, the electric valve, the manual valve, the main flushing pipeline, the flushing branch pipe, the nozzle and the disturbance nozzle to enter the bottom of the large storage tank and form a swirl at the bottom of the large storage tank, and through the swirl disturbance, the insoluble substances in the water cannot settle, and thus cannot accumulate at the bottom of the large storage tank to form silt; open the outlet valve and discharge it; in the field of solution mining cavity formation, the insoluble substances in the fresh brine are injected into the underground salt cavity together with the fresh brine, avoiding additional water use and environmental pollution.

[0015] On the basis of the above solution, preferably, the specific steps of S3 are as follows: Monitor the data of the flushing water flow rate, the influent water flow rate, the effluent water flow rate, and the sludge accumulation in the storage tank, and control two electric valves to flexibly adjust the flushing water flow rate and the different flow rates of two main flushing pipelines, so as to achieve different flushing intensities in different areas of the large storage tank and avoid local sludge accumulation.

[0016] On the basis of the above solution, preferably, the specific steps of S4 are as follows: Conduct a device overhaul once a year. Close the influent valve and the manual valve, drain the liquid. After the liquid is drained, close the effluent pump. The maintenance personnel enter the large storage tank from the maintenance port for maintenance. Focus on checking whether the main flushing pipeline, the flushing branch pipe, the bracket, and the tank wall are corroded, and whether the nozzles of the branch pipes, the spray holes and the nozzles of the disturbance nozzles are crystallized and blocked; If the main flushing pipeline, the flushing branch pipe, the bracket, and the tank wall are corroded, it is necessary to replace the severely corroded parts and reapply the polyurea anti-corrosion layer to the slightly corroded parts. If the nozzles of the branch pipes, the spray holes and the nozzles of the disturbance nozzles are crystallized and blocked, it is necessary to dredge the blocked parts.

[0017] Compared with the prior art, the beneficial effects of the present invention are: Compared with the existing device system, the present invention has the advantages of improving the anti-accumulation efficiency, reducing the safety risk, reducing the potential safety hazards, reducing the economic investment, and achieving the continuous, efficient and automatic anti-accumulation effect of the large storage tank. Description of the Drawings

[0018] Figure 1 is a schematic diagram of a large storage tank swirl flushing anti-accumulation device; Figure 2 is a top view of the disturbance nozzle; Figure 3 is a plan view of the disturbance nozzle.

[0019] In the figure: 1. Flushing main pipe; 2. Flushing valve; 3. Three-way pipe; 4. Main flushing pipeline; 5. Flushing flowmeter; 6. Electric valve; 7. Manual valve; 8. Large storage tank; 9. Flushing branch pipe; 10. Branch pipe nozzle; 11. Influent branch pipe; 12. Bracket; 13. Disturbance nozzle; 131. Spray hole; 132. Nozzle; 133. Water flow tangent baffle; 14. Influent flowmeter; 15. Influent valve; 16. Influent main pipe; 17. Drain valve; 18. Effluent pipeline; 19. Effluent valve; 20. Effluent flowmeter; 21. Effluent pump; 22. Monitoring and management system. Specific implementation method

[0020] Such as Figures 1-3As shown in the figure, a large storage tank swirl flushing anti-accumulation device includes: a flushing main pipe 1, a flushing valve 2, a tee 3, a main flushing pipeline 4, a flushing flowmeter 5, an electric valve 6, a manual valve 7, a large storage tank 8, flushing branch pipes 9, branch nozzles 10, a water inlet branch pipe 11, a bracket 12, a disturbance nozzle 13, a spray hole 131, a spray port 132, a water flow tangent baffle 133, a water inlet flowmeter 14, a water inlet valve 15, a water inlet main pipe 16, a sewage discharge valve 17, a water outlet pipeline 18, a water outlet valve 19, a water outlet flowmeter 20, a water outlet pump 21, a monitoring and management system 22; It is characterized in that: one end of the flushing main pipe 1 is connected to the water outlet pipeline 18, and the connection point is located after the outlet of the water outlet pump 21, and the flushing water is conveyed by the water outlet pump 21; the other end of the flushing main pipe 1 is connected to the tee 3, and a flushing valve 2 is installed near the tee 3 of the flushing main pipe 1 to control the flushing of the large storage tank 8; one end of the tee 3 is connected to the flushing main pipe 1, and the remaining two ends are connected with two main flushing pipelines 4; a flushing flowmeter 5, an electric valve 6 and a manual valve 7 are installed on the two main flushing pipelines 4 in sequence from the tee 3 to the tank wall of the large storage tank 8 to count the flushing water flow of the main flushing pipeline 4 and adjust the flow; the two main flushing pipelines 4 pass through the lower part of the large storage tank 8 and enter the large storage tank 8 and extend to the opposite tank wall, and a sewage discharge valve 17 is connected after passing through the opposite tank wall to discharge the sludge in the main flushing pipeline 4; a plurality of flushing branch pipes 9 are respectively installed on both sides of the main flushing pipeline 4, and the flushing branch pipes 9 extend radially; a branch nozzle 10 is installed on the right side of the flushing branch pipe 9, which is arranged in a clockwise direction to spray the flushing water in the clockwise direction to drive the water in the barrel to form a swirl; the water inlet flowmeter 14 is connected to the water inlet valve 15 through the water inlet main pipe 16, the water inlet main pipe 16 is connected to the top of the large storage tank 8, and after entering the large storage tank 8, two water inlet branch pipes 11 are separated, and the water inlet branch pipes 11 extend to the bottom of the large storage tank 8 and extend horizontally in the clockwise direction at the end to convey water to the bottom of the large storage tank 8 and form a swirl by using the potential energy; the water outlet pipeline 18 is connected to the lower part of the large storage tank 8, and a water outlet valve 19, a water outlet flowmeter 20 and a water outlet pump 21 are installed on the water outlet pipeline 18 in sequence to convey the water out, and the water outlet pipeline 18 is connected to the flushing main pipe 1 after the outlet of the water outlet pump 21; a disturbance nozzle 13 is installed on the flushing branch pipe 9 near the water outlet pipeline 18 to disturb the insoluble substances near the water outlet pipeline 18 and further prevent the accumulation of insoluble substances at the water outlet pipeline 18; a spray hole 131 is opened on the pipeline of the disturbance nozzle 13, the end spray port 132 sprays upward, and a water flow tangent baffle 133 is installed at the spray port 132 to ensure that the sprayed water flow spreads in a sheet; the monitoring and control system 22 is connected to the flushing flowmeter 5, the water inlet flowmeter 14, the water outlet flowmeter 20, the large storage tank 8 and the electric valve 6 through wires to monitor the flushing water flow, the water inlet flow, the water outlet flow and the accumulation of silt in the storage tank and adjust the flushing water flow.

[0021] Further, the flushing main pipe can be connected to multiple three-way pipes as required for the swirling anti-accumulation work of multiple large storage tanks; the number and horizontal arrangement direction of the flushing branch pipes, branch nozzles and disturbance nozzles can be adjusted according to the diameter of the large storage tank, and the disturbance nozzles are arranged in the area close to the water outlet valve; the flushing branch pipe shall not be directly arranged in front of the outlet of the water inlet branch pipe to avoid damage to the flushing branch pipe and the branch nozzle caused by excessive water inlet potential energy.

[0022] Further, the diameters of the flushing water pipe, the flushing main pipe and the main flushing pipe are 219 mm, the diameter of the flushing branch pipe is 101 mm, the diameter of the branch nozzle is 45 mm, the distance between the end of the flushing branch pipe and the tank wall is 2 m, and the distance between the outlet of the water inlet branch pipe and the tank wall is 1 m; the connection between the main flushing pipe and the tank wall of the large storage tank is circularly reinforced with a radius of 200 mm centered on the midline of the main flushing pipe to prevent the sealing failure at the connection due to pipeline vibration.

[0023] Further, the horizontal extension direction of the branch nozzle is perpendicular to the extension direction of the flushing branch pipe, the branch nozzle inclines downward by 10° in the vertical direction, the nozzle length is 300 mm, and it impacts the tank bottom to prevent the accumulation of insoluble substances; the diameter of the disturbance nozzle is 101 mm, the spray holes on the disturbance nozzle pipe incline to both sides by 45°, the diameter of the spray holes is 15 mm, the distance between the spray holes is 200 mm, there are 8 in total, the diameter of the end spray port is 45 mm, and it sprays upward, and the water flow tangent baffle at the spray port is 10 mm thick.

[0024] Further, the water inlet branch pipe, the main flushing pipe, the flushing branch pipe and the disturbance nozzle are all fixed to the bracket by hoop, and the bracket is in the shape of a gantry; the height of the water inlet branch pipe bracket from the tank bottom is 300 mm, and it is thickened to increase the load-bearing capacity, the height of the main flushing pipe bracket from the tank bottom is 300 mm, and the height of the flushing branch pipe and the disturbance nozzle bracket from the tank bottom is 359 mm; the water inlet branch pipe bracket is perpendicular to the outlet direction of the water inlet branch pipe, the main flushing pipe bracket is perpendicular to the main flushing pipe direction, and the flushing branch pipe bracket is arranged parallel to the branch nozzle direction of its respective flushing branch pipe to reduce the resistance of the bracket to the brine; the height of the water outlet pipe from the tank bottom is 300 mm.

[0025] The above-mentioned swirling flushing anti-accumulation method for a large storage tank includes the following steps: S1. Equipment installation Connect the flushing main pipe, flushing valve, tee, main flushing pipeline, flushing flowmeter, electric valve, manual valve, large storage tank, flushing branch pipe, branch pipe nozzle, water inlet branch pipe, bracket, disturbing nozzle, spray hole, spray port, water flow tangent baffle, water inlet flowmeter, water inlet valve, water inlet main pipe, sewage discharge valve, water outlet pipeline, water outlet valve, water outlet flowmeter, and water outlet pump in sequence; connect the monitoring and control system to the flushing flowmeter, water inlet flowmeter, water outlet flowmeter, large storage tank, and electric valve through wires; to prevent the corrosion of the whole device by brine, all the pipelines, nozzles, brackets in the tank and the tank wall are coated with polyurea anti-corrosion layer, which is sprayed three times with primer, intermediate coating and topcoat, and each layer is dried after spraying, and the next layer is sprayed after drying for at least 24 hours; calculate the flushing flow according to parameters such as the volume of the large storage tank, water inlet flow, water outlet flow, brine concentration, and insoluble content.

[0026] S2. Start and run Close the sewage discharge valve, close the water outlet valve, close the flushing valve, open the water inlet valve, the water inlet enters the large storage tank through the water inlet main pipe and the water inlet branch pipe and forms a swirl, open the water outlet valve, open the water outlet pump, open the electric valve, open the flushing valve, open the flushing valve, a part of the water pumped by the water outlet pump is used as flushing water and sequentially passes through the flushing valve, electric valve, manual valve, main flushing pipeline, flushing branch pipe, nozzle and disturbing nozzle and enters the bottom of the large storage tank and forms a swirl at the bottom of the large storage tank. Through the swirl disturbance, the insoluble substances in the water cannot settle, and thus cannot accumulate at the bottom of the large storage tank to form sludge; open the water outlet valve and discharge it; in the field of water-soluble cavity formation, the insoluble substances in the fresh brine are injected into the underground salt cavity together with the fresh brine, avoiding additional water use and environmental pollution.

[0027] S3. Monitor and adjust Monitor the data of flushing water flow, water inlet flow, water outlet flow and the sludge accumulation situation in the storage tank, and control the two electric valves to flexibly adjust the flushing water flow and the different flows of the two main flushing pipelines, so as to realize different flushing intensities in different areas of the large storage tank and avoid local sludge accumulation.

[0028] S4. Maintenance work Conduct device maintenance once a year. Close the water inlet valve, close the manual valve, drain the liquid. After the liquid is drained, close the water outlet pump. The maintenance personnel enter the large storage tank from the maintenance opening for maintenance. Focus on checking whether the main flushing pipeline, flushing branch pipe, bracket and tank wall are corroded, and whether the spray holes and spray ports of the branch pipe nozzle and disturbing nozzle are crystallized and blocked; if the main flushing pipeline, flushing branch pipe, bracket and tank wall are corroded, replace the severely corroded parts and re-coat the slightly corroded parts with polyurea anti-corrosion layer. If the spray holes and spray ports of the branch pipe nozzle and disturbing nozzle are crystallized and blocked, dredge the blocked parts.

[0029] So far, the method of the present invention can improve the anti-accumulation efficiency, reduce the safety risk, eliminate potential safety hazards, reduce the economic investment, and achieve the continuous and efficient automatic anti-accumulation effect of large storage tanks.

Claims

1. A large storage tank swirl flushing anti-accumulation device, characterized in that: It includes a flushing main pipe, on which a flushing valve is installed. One end of the flushing main pipe is connected to the outlet pipe, and the other end is connected to one end of a tee. The remaining two ends of the tee are connected with two main flushing pipes. From the tee to the tank wall of the large storage tank, a flushing flowmeter, an electric valve and a manual valve are installed in sequence on the two main flushing pipes. The two main flushing pipes pass through the lower part of the large storage tank, enter the large storage tank and extend to the opposite tank wall. After passing through the opposite tank wall, a sewage valve is connected. A plurality of flushing branch pipes are installed on both sides of the main flushing pipes. The flushing branch pipes extend radially. A branch nozzle is installed on the right side of the flushing branch pipe, which is arranged in a clockwise direction. The inlet flowmeter is connected to the inlet valve through the inlet main pipe. The inlet main pipe is connected to the top of the large storage tank. After entering the large storage tank, two inlet branch pipes are separated. The inlet branch pipes extend to the bottom of the large storage tank and extend horizontally in a clockwise direction at the end. The outlet pipe is connected to the lower part of the large storage tank. An outlet valve, an outlet flowmeter and an outlet water pump are installed in sequence on the outlet pipe. After the outlet of the outlet water pump, the outlet pipe is connected to the flushing main pipe; a disturbance nozzle is installed on the flushing branch pipe near the outlet pipe. Spray holes are opened on the pipeline of the disturbance nozzle, and the end spray port sprays upward. A water flow tangent baffle is installed at the spray port. The monitoring and control system is connected to the flushing flowmeter, the inlet flowmeter, the outlet flowmeter, the large storage tank and the electric valve through wires.

2. The swirl flushing anti-accumulation device for a large storage tank according to claim 1, characterized in that: A number of tee pipes are installed on the flushing main pipe. Each tee pipe corresponds to a disturbance nozzle of a large storage tank and is arranged in the area near the outlet valve; the flushing branch pipe shall not be directly arranged in front of the outlet of the inlet branch pipe to avoid damage to the flushing branch pipe and the branch nozzle caused by excessive inlet potential energy.

3. The swirl flushing anti-accumulation device for a large storage tank according to claim 1, wherein: The diameters of the flushing water pipe, the flushing main pipe and the main flushing pipe are 219 mm, the diameter of the flushing branch pipe is 101 mm, the diameter of the branch nozzle is 45 mm, the distance between the end of the flushing branch pipe and the tank wall is 2 m, and the distance between the outlet of the inlet branch pipe and the tank wall is 1 m; the connection between the main flushing pipe and the tank wall of the large storage tank is circularly reinforced with a radius of 200 mm centered on the center line of the main flushing pipe to prevent the sealing failure at the connection due to pipeline vibration.

4. A large storage tank swirl flushing anti-accumulation device according to claim 1, characterized in that: The horizontal extension direction of the branch nozzle is perpendicular to the extension direction of the flushing branch pipe. The branch nozzle inclines downward by 10° in the vertical direction. The length of the spray pipe is 300 mm. The diameter of the disturbance nozzle is 101 mm. The spray holes on the pipeline of the disturbance nozzle incline to both sides at 45°. The diameter of the spray holes is 15 mm. The distance between the spray holes is 200 mm, and there are 8 in total. The diameter of the end spray port is 45 mm and sprays upward. The water flow tangent baffle at the spray port is 10 mm thick.

5. The swirl flushing anti-accumulation device for a large storage tank according to claim 1, characterized in that: The inlet branch pipe, the main flushing pipe, the flushing branch pipe and the disturbance nozzle are all fixed to the bracket by hoop. The bracket is in the shape of a gantry; the height of the bracket of the inlet branch pipe from the tank bottom is 300 mm, the height of the bracket of the main flushing pipe from the tank bottom is 300 mm, and the height of the brackets of the flushing branch pipe and the disturbance nozzle from the tank bottom is 359 mm; the bracket of the inlet branch pipe is perpendicular to the outlet direction of the inlet branch pipe, the bracket of the main flushing pipe is perpendicular to the direction of the main flushing pipe, and the brackets of the flushing branch pipes are arranged parallel to the direction of the branch nozzles of their respective flushing branch pipes to reduce the resistance of the bracket to the brine; the height of the outlet pipe from the tank bottom is 300 mm.

6. A method for preventing accumulation by swirl flushing of a large storage tank, characterized in that, It is realized by using the large storage tank swirl flushing anti-accumulation device described in any one of claims 1-5, and includes the following steps: S1. Equipment installation; S2. Start-up operation; S3. Monitoring and adjustment; S4. Maintenance work.

7. A method for preventing accumulation by swirl flushing of a large storage tank according to claim 6, characterized in that, The specific steps of S1 are as follows: Connect the flushing main pipe, flushing valve, tee, main flushing pipeline, flushing flowmeter, electric valve, manual valve, large storage tank, flushing branch pipe, branch nozzle, water inlet branch pipe, support, disturbance nozzle, spray hole, spray port, water flow tangent baffle, water inlet flowmeter, water inlet valve, water inlet main pipe, sewage discharge valve, water outlet pipeline, water outlet valve, water outlet flowmeter, and water outlet pump in sequence; Connect the monitoring and control system to the flushing flowmeter, water inlet flowmeter, water outlet flowmeter, large storage tank, and electric valve through wires; To prevent the corrosion of the whole device by brine, all in-tank pipelines, nozzles, supports and the tank wall are coated with a polyurea anti-corrosion layer, which is sprayed three times with primer, intermediate coating and topcoat, and drying treatment is carried out after each spraying. The next spraying is carried out after drying for at least 24 hours; Calculate the flushing flow according to the parameters of the volume of the large storage tank, water inlet flow, water outlet flow, brine concentration, and insoluble content.

8. A method for preventing accumulation by swirl flushing of a large storage tank according to claim 7, characterized in that, The specific steps of S2 are as follows: Close the sewage discharge valve, close the water outlet valve, close the flushing valve, open the water inlet valve, the water inlet enters the large storage tank through the water inlet main pipe and the water inlet branch pipe and forms a swirl, open the water outlet valve, open the water outlet pump, open the electric valve, open the flushing valve, open the flushing valve, a part of the water pumped by the water outlet pump is used as flushing water and sequentially passes through the flushing valve, electric valve, manual valve, main flushing pipeline, flushing branch pipe, nozzle and disturbance nozzle to enter the bottom of the large storage tank and form a swirl at the bottom of the large storage tank. Through the swirl disturbance, the insoluble substances in the water cannot settle, and thus cannot accumulate at the bottom of the large storage tank to form sludge; Open the water outlet valve and discharge it; In the field of solution mining, the insoluble substances in the fresh brine are injected into the underground salt cavity together with the fresh brine, avoiding additional water use and environmental pollution.

9. A method for preventing accumulation by swirl flushing of a large storage tank according to claim 8, characterized in that, The specific steps of S3 are as follows: Monitor the data of the flushing water flow, water inlet flow, water outlet flow and the sludge accumulation situation in the storage tank, and control the two electric valves to flexibly adjust the flushing water flow and the different flows of the two main flushing pipelines, so as to realize different flushing intensities in different areas of the large storage tank and avoid local sludge accumulation.

10. A method for preventing accumulation by swirl flushing of a large storage tank according to claim 9, characterized in that, The specific steps of S4 are as follows: Conduct device maintenance once a year, close the water inlet valve, close the manual valve, drain the liquid, close the water outlet pump after the liquid is drained, and the maintenance personnel enter the large storage tank from the maintenance port for maintenance. Focus on checking whether the main flushing pipeline, flushing branch pipe, support and tank wall are corroded, and whether the spray holes and spray ports of the branch nozzles and disturbance nozzles are crystallized and blocked; If the main flushing pipeline, flushing branch pipe, support and tank wall are corroded, the severely corroded parts need to be replaced, and the slightly corroded parts need to be re-coated with a polyurea anti-corrosion layer. If the spray holes and spray ports of the branch nozzles and disturbance nozzles are crystallized and blocked, the blocked parts need to be dredged.

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