Dust suppression device for compressed air foam

Abstract

The utility model provides a dust suppression device for compressed air foam, the dust suppression device comprises a curtain foam generator, an integrated feeder and a foam stock solution storage tank, the curtain foam generator is connected with the integrated feeder through a liquid level signal line, an air supply pipeline and a foam solution pipeline; the foam stock solution storage tank is connected with the integrated feeder through a stock solution pipeline, a water inlet and a stock solution inlet are formed in the outer side of the integrated feeder, and the integrated feeder internally comprises a dispensing proportional valve, a diluent box, a screw air compressor, a system control box, a stock solution lifting pump and a solution dispensing pump. The device is small in foam diameter, uniform in size, high in foam production rate and foam expansion, larger in specific surface area, fine and uniform in foam and not prone to breakage; and compared with other foaming forms, the device has the characteristics of improving the dust suppression efficiency, being simple in structure, high in usability, low in maintenance amount, low in operation cost, good in dust suppression effect and the like.

Description

Technical Field

[0001] This article belongs to the technical field of dust suppression, specifically relating to a dust suppression device using compressed air foam. Background Technology

[0002] Coal conveying systems in thermal power plants generate a large amount of production dust during the coal conveying process, including unloading, plowing, and crushing. This dust pollution is particularly severe at coal transfer stations, especially those at coal crusher buildings. It endangers the health of operation and maintenance personnel, causes coal dust loss, and poses safety hazards to surrounding equipment.

[0003] Existing technologies for foam dust suppression involve complex foam generator mechanisms, typically employing stirring, foaming net, baffle, or foam nozzle types, resulting in complex structures, high manufacturing costs, low system reliability and stability, and issues such as uneven foam distribution, large bubbles, and variations in foaming ratio and foaming rate. Utility Model Content

[0004] To address the aforementioned issues, this paper proposes a "Compressed Air Foam System," comprising a foam concentrate storage tank, a diluent tank, a dispensing assembly, an air compressor, a dispensing pump, and a system control box; a two-in-one curtain-type foam dust suppression terminal (containing a foaming device); and an air-liquid piping system. A dust suppression device for compressed air foam includes a curtain foam generator, an integrated feeder, and a foam concentrate storage tank. The curtain foam generator is connected to the integrated feeder via a level signal line, an air supply line, and a foam concentrate line. The foam concentrate storage tank is connected to the integrated feeder via a concentrate line. The integrated feeder has a water inlet and a concentrate inlet on its outer side. The integrated feeder's interior includes a proportioning valve, a diluent tank, a screw air compressor, a system control box, a concentrate booster pump, and a dispensing pump. The diluent tank's inlet is connected to the foam concentrate storage tank and a water inlet via the proportioning valve. The outlet of the diluent tank is connected to the foam injection port of the curtain foam generator via a foam liquid pipeline and a dispensing pump. The screw air compressor is directly connected to the air inlet of the curtain foam generator via an air supply pipeline. The system control box is connected to the compressed foam generator of the curtain foam generator via a liquid level signal line. This device produces foam with small diameter, uniform size, high foam production rate and foaming ratio, larger specific surface area, fine and uniform foam that is not easily broken. It uses less water and has improved dust suppression efficiency compared with other foaming methods. The device has a simple structure, is easy to use, requires little maintenance, has low operating costs, and has good dust suppression effect.

[0005] The integrated feeder is a skid-mounted device with an enclosed outer shell. The water inlet of the integrated feeder is equipped with a manual water inlet valve on the outside. The raw liquid inlet of the integrated feeder is directly connected to the internal raw liquid booster pump. The integrated feeder is equipped with a liquid level signal line, an air supply line, a foam liquid line, and a foam liquid line respectively. The inside of the manual water inlet valve is connected to the dosing ratio valve through a water inlet electric valve. By directly setting the water inlet and raw liquid inlet on the outside of the integrated feeder, it is easy to move and skid-mount the entire device, and it can also be installed on the outside of a dust suppression device.

[0006] The diluent tank is a mixing output tank. An internal diluent level gauge is installed inside the tank. The inlet of the diluent tank is connected to the proportioning valve, and the outlet is connected to the dispensing pump. The diluent level gauge is connected to the system control box via wires and contains a level switch that provides a replenishment signal to the system, which is linked to the supply pump to ensure that the dust suppression system is also supplied. The proportioning valve is a dual-port mixing and regulating pump. Its inlet is connected to both the water inlet electric valve and the foam concentrate storage tank, and its outlet is connected to the diluent tank. When the diluted dust suppression liquid tank is at a low level, the water distribution electric valve and the proportioning valve of the dispensing assembly are activated. When the diluted dust suppression liquid tank reaches the upper level, the water distribution electric valve and the proportioning valve of the dispensing assembly are stopped.

[0007] The screw air compressor is an air-type output blowing and pressurizing compressor. The air inlet of the screw air compressor is connected to the outer air inlet of the integrated supply unit. The air outlet of the screw air compressor is connected to the air inlet of the curtain foam generator through the air supply pipeline. The screw air compressor is connected to the system control box through the wire. The air compressor supplies air to the curtain foam generator, thereby realizing the aeration and generation of foam generating liquid.

[0008] The system control box is a circuit-controlled control box. The system control box is connected to the curtain foam generator, foam raw material storage tank, diluent tank and screw air compressor control. The whole device is controlled in an integrated manner through the system control box, which makes it easy to install independently in various dust-prone locations, realize independent operation and reduce program costs.

[0009] The foam raw material storage tank is a multi-layered storage tank. The inside of the foam raw material storage tank is equipped with a raw material storage tank level switch. The inlet of the foam raw material storage tank is connected to the raw material booster pump, and the outlet of the foam raw material storage tank is connected to the dosing proportioning valve. The raw material storage tank level switch is connected to the system control box through a wire.

[0010] The curtain foam generator has a compressed foam generator inside its outer casing. The compressed foam generator is a porous cylindrical material made of high-molecular polymer. Its surface has micropores with a porosity of over 80%, and the micropore diameter is 5-50 micrometers. The compressed foam generator is submerged in the foam liquid inside the outer casing. The outer casing is cylindrical in shape. Several adjustable lifting rings are vertically mounted on the top of the outer casing. Foam distributors protrude from the front and rear sides of the bottom of the outer casing. A guide valve is located on the upper surface of the outer casing. The device features a foam overflow port, shaped as a rectangular slot. An overflow cover is embedded within the overflow port, protruding above it. The cover is pneumatically operated and moves vertically within the overflow port. The front and rear sides of the foam distributor protrude from the front and rear width surfaces of the outer casing. The outer casing is a hollow cylindrical cavity. A foam liquid injection port is located at the top of one end of the outer casing. A transversely connected port is located at the top inner side of the outer casing. The device is equipped with an upper reinforcing rib, and a lower reinforcing rib is horizontally connected to the bottom outer side of the outer casing. A foam distributor is externally mounted on the outer side of the lower reinforcing rib. One end of the outer casing has a through-type air inlet, an outlet, and an inlet pressure regulating valve. The other end of the outer casing has an embedded liquid level gauge. A level is horizontally mounted in the middle of the outer surface of the outer casing. The overflow port cover is a rectangular shell made of welded folded plates. The outer contour of the overflow port cover is the same as the inner contour of the foam overflow port. The inner top surface of the overflow port cover is flush with the pneumatic overflow port. The pneumatic overflow cover switch is fixedly connected to the outer casing of the device. The pneumatic overflow cover switch is a pneumatic push-rod type switch. The pneumatic overflow cover switch is interconnected with the outside of the device housing by opening the air inlet and closing the air outlet. The base of the pneumatic overflow cover switch is fixed to the top surface of the upper reinforcing rib. The push rod of the pneumatic overflow cover switch is connected to the inner top surface of the overflow cover. It has a simple structure, high foaming efficiency, and a point-to-point waterfall-style fire extinguishing method, which improves fire extinguishing efficiency. It is a highly adaptable waterfall-style compressed air foam fire extinguishing device with technical effects such as reducing the fire range, reducing fire losses, and high fire extinguishing efficiency.

[0011] Beneficial effects:

[0012] It can effectively prevent dust from spreading to the outside world; greatly increase the probability of collision with dust particles; rapidly change the wetting properties of dust, increasing the speed at which dust is wetted; the foam has good adhesion, and once dust comes into contact with the foam, it will be quickly adhered to the foam, thus increasing the adhesion efficiency between the foam and the dust.

[0013] Water consumption is reduced by 35%-80%; dust suppression efficiency is 2-5 times higher than dry fog (fine water spray); according to relevant foreign data, foam dust suppression efficiency is as high as 90-95%; deposited coal dust is reduced by 40-50% and floating coal dust is reduced by 50-70%, achieving very good results in dust suppression.

[0014] The curtain foam generator has a simple structure and high foaming efficiency. It uses a point-to-point waterfall-style fire extinguishing method to improve fire extinguishing efficiency. The highly adaptable waterfall-style compressed air foam fire prevention and extinguishing device has the technical effects of reducing the fire range, reducing fire losses, and high fire extinguishing efficiency.

[0015] By directly setting the water inlet and raw material inlet on the outside of the integrated feeder, the entire device can be easily moved and skid-mounted, and can also be installed on the outside of the dust suppression device.

[0016] It has high dust reduction efficiency, which can effectively reduce the dust concentration around the coal conveyor belt, significantly improve the working environment, reduce the harm of dust to the health of workers, and also reduce the safety hazards caused by dust accumulation, such as dust explosions.

[0017] It has the advantages of low water consumption: Compared with traditional wet dust suppression methods such as spray dust suppression, CAFS foam dust suppression can reduce water consumption by 30%-80%.

[0018] Excellent dust suppression effect: The dust suppression efficiency is 3-5 times higher than that of spraying water, which can more effectively control respirable dust and can also play a good role in capturing and settling the finest dust that is most harmful to the human body.

[0019] Easy to install and maintain. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a dust suppression device using compressed air foam.

[0021] Figure 2 This is a schematic diagram of a curtain foam generator, which is a dust suppression device using compressed air foam.

[0022] In the diagram: 1. Foam generator, 2. Manual inlet valve, 3. Electric inlet valve, 4. Dosing proportioning valve, 5. Diluent tank, 6. Diluent level gauge, 7. System control box, 8. Screw air compressor, 9. Raw material lift pump, 10. Mixing pump, 11. Foam raw material storage tank, 12. Raw material storage tank level switch, 13. Level signal line, 14. Air supply pipeline, 15. Foam liquid pipeline, 16. Device housing, 17. Foam flow equalizer, 18. Compressed foam generator, 19. Overflow port cover, 20. Pneumatic overflow port switch, 21. Adjustable lifting ring, 22. Open air inlet, 23. Close air outlet, 24. Inlet pressure regulating valve, 25. Foam liquid drain outlet, 26. Level, 27. Inlet hose, 28. Upper reinforcing rib, 29. Lower reinforcing rib, 30. Foam overflow port. Detailed Implementation

[0023] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0024] 1. Foam generator for curtain; 2. Manual inlet valve; 3. Electric inlet valve; 4. Dosing ratio valve; 5. Diluent tank; 6. Diluent level gauge; 7. System control box; 8. Screw air compressor; 9. Raw material lift pump; 10. Mixing pump; 11. Foam raw material storage tank; 12. Raw material storage tank level switch; 13. Level signal line; 14. Air supply line; 15. Foam liquid line; 16. Device housing; 17. Foam flow equalizer; 18. Compressed foam generator; 19. Overflow port cover; 20. Pneumatic overflow port switch; 21. Adjustable lifting ring; 22. Open air inlet; 23. Close air outlet; 24. Air inlet pressure regulating valve; 25. Foam liquid drain outlet; 26. Level; 27. Air inlet hose; 28. Upper reinforcing rib; 29. ​​Lower reinforcing rib; 30. Foam overflow port.

[0025] like Figure 1 , 2 As shown;

[0026] A dust suppression device for compressed air foam includes a curtain foam generator 1, an integrated feeder, and a foam concentrate storage tank. The curtain foam generator 1 is connected to the integrated feeder via a liquid level signal line 13, an air supply line 14, and a foam concentrate line 15. The foam concentrate storage tank is connected to the integrated feeder via a concentrate line. The integrated feeder has a water inlet and a concentrate inlet on its outer side. The integrated feeder includes a dosage proportioning valve 4, a diluent tank 5, a screw air compressor 8, a system control box 7, a concentrate booster pump 9, and a dispensing pump 10. The inlet of the diluent tank 5 is connected to the foam concentrate storage tank and the water inlet via the dosage proportioning valve 4. The outlet of the diluent tank 5 is connected to the dispensing pump 10 via the foam concentrate line 15. Pump 10 is connected to the foam injection port of curtain foam generator 1. The screw air compressor 8 is directly connected to the air inlet of curtain foam generator 1 via air supply line 14. The system control box 7 is connected to the compressed foam generator 18 of curtain foam generator 1 via liquid level signal line 13. The integrated supply unit is a skid-mounted device with an enclosed outer shell. The water inlet of the integrated supply unit is equipped with a manual water inlet valve 2 on the outside. The raw liquid inlet of the integrated supply unit is directly connected to the internal raw liquid booster pump 9. The integrated supply unit is equipped with liquid level signal line 13, air supply line 14, foam liquid line 15, and foam liquid line 15 respectively. The inside of the manual water inlet valve 2 is connected to the electric water inlet valve 3 and the dosing ratio valve 4. Diluent Tank 5 is a mixing output tank. A diluent level gauge 6 is installed inside the diluent tank 5. The inlet of the diluent tank 5 is connected to the proportioning valve 4, and the outlet of the diluent tank 5 is connected to the dispensing pump 10. The diluent level gauge 6 is connected to the system control box 7 via a wire. The screw air compressor 8 is an air-type output blowing compressor. The air inlet of the screw air compressor 8 is connected to the outer air inlet of the integrated supply unit. The air outlet of the screw air compressor 8 is connected to the air inlet of the curtain foam generator 1 via the air supply pipeline 14. The screw air compressor 8 is connected to the system control box 7 via a wire. The system control box 7 is a circuit-controlled control box, and it is connected to the curtain foam generator 1, the foam concentrate storage tank, the diluent tank 5, and the screw air compressor 8 via a receiving control connection. The foam concentrate storage tank is a multi-layered storage tank. Inside the foam concentrate storage tank is a concentrate storage tank level switch 12. The inlet of the foam concentrate storage tank is connected to the concentrate booster pump 9, and the outlet of the foam concentrate storage tank is connected to the dosing proportioning valve 4. The concentrate storage tank level switch 12 is connected to the system control box 7 via a wire. The dosing proportioning valve is a dual-port mixing and regulating pump. The inlet of the dosing proportioning valve is connected to both the water inlet electric valve 3 and the foam concentrate storage tank, and the outlet of the dosing proportioning valve is connected to the diluent tank 5. Inside the outer casing 16 of the curtain foam generator 1 is a compressed foam generator 18. The compressed foam generator 18 is made of a porous cylindrical material formed from a high-molecular polymer, and its surface has micropores with a porosity of over 80%.The compressed foam generator 18 has a micropore diameter of 5-50 micrometers. It is submerged in foam liquid within the outer casing 16. The outer casing 16 is cylindrical in shape. Several adjustable lifting rings 21 are vertically positioned at the top of the outer casing 16. Foam distributors 17 protrude from the front and rear sides of the bottom of the outer casing 16. A foam overflow port 30 is provided on the upper surface of the outer casing 16, and the foam overflow port 30 is a rectangular slot with an embedded inner side. The device is equipped with an overflow port cover 19, which is embedded and protrudes above the foam overflow port 30. The interior of the overflow port cover 19 is positioned inside the foam overflow port 30 by a pneumatic overflow port switch 20. The front and rear sides of the foam distributor 17 are protruding from the front and rear width surfaces of the device housing 16. The device housing 16 is a hollow cylindrical cavity. A foam liquid injection port is provided at the top of one end of the device housing 16. The top of the inner side of the device housing 16 is laterally connected to an upper... The device housing 16 has a lower reinforcing rib 29, which is horizontally connected to the bottom outer side. A foam distributor 17 is externally attached to the outer side of the lower reinforcing rib 29. One end of the housing 16 has an open air inlet 22, a closed air outlet 23, and an air pressure regulating valve 24. The other end of the housing 16 has an embedded liquid level gauge. A level 26 is horizontally mounted in the middle of the outer surface of the housing 16. The overflow port cover 19 is a rectangular shell with welded folded plates. The outer contour of the overflow cover plate 19 is the same as the inner contour of the foam overflow port 30. The inner top surface of the overflow port cover plate 19 is fixedly connected to the pneumatic overflow cover switch 20. The pneumatic overflow cover switch 20 is a pneumatic push-rod type switch. The pneumatic overflow cover switch 20 communicates with the outside of the device housing 16 by opening the air inlet 22 and closing the air outlet 23. The base of the pneumatic overflow cover switch 20 is fixedly connected to the top surface of the upper reinforcing rib 28. The push rod of the pneumatic overflow cover switch 20 is connected to the inner top surface of the overflow port cover plate 19.

[0027] Implementation example;

[0028] Application of CAFS foam dust suppression device in coal conveyor belt

[0029] CAFS foam dust suppression technology is used to further improve dust suppression efficiency and reduce dust overflow. CAFS foam dust suppression technology has the functions of covering and blocking, wetting and capturing, and collision adsorption in the dust control of coal conveyor belts.

[0030] It can effectively reduce the dust concentration around the coal conveyor belt, reduce the harm of dust to the health of workers, and also reduce the safety hazards caused by dust accumulation.

[0031] In use, water is supplied to the dosing ratio valve 4 through the manual water inlet valve 2 and the electric water inlet valve 3, and the original solution is stored in the foam original solution storage tank 11 through the original solution booster pump 9. The foam original solution storage tank 11 then supplies the original solution to the dosing ratio valve 4, and the dosing ratio valve 4 stores the prepared diluted foam solution into the diluent tank 5.

[0032] When the curtain foam generator 1 needs to generate foam, the screw air compressor 8 supplies air to the curtain foam generator 1 through the air supply line 14, and the diluent tank 5 supplies the curtain foam generator 1 through the foam liquid line 15 and the liquid distribution pump 10.

[0033] When the foam output uniform plate is opened, the gas that enters the foaming device instantaneously through the compressed air pipeline passes through the release device with a polymer medium layer and comes into contact with the solution to be foamed to generate foam. The generated foam flows through the foam uniform output plate in a waterfall manner to the surface of the dust source, suppressing and covering the dust.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dust suppression device for compressed air foam, the dust suppression device comprising a curtain foam generator, an integrated feeder, and a foam concentrate storage tank, characterized in that, The curtain foam generator is connected to the integrated supply unit via a liquid level signal line, an air supply line, and a foam liquid line. The foam concentrate storage tank is connected to the integrated supply unit via a concentrate line. The integrated supply unit has a water inlet and a concentrate inlet on its outer side. The integrated supply unit includes a dosing ratio valve, a diluent tank, a screw air compressor, a system control box, a concentrate booster pump, and a dispensing pump. The inlet of the diluent tank is connected to the foam concentrate storage tank and the water inlet via the dosing ratio valve. The outlet of the diluent tank is connected to the foam injection port of the curtain foam generator via a foam liquid line and a dispensing pump. The screw air compressor is directly connected to the air inlet of the curtain foam generator via an air supply line. The system control box is connected to the compressed foam generator of the curtain foam generator via a liquid level signal line.

2. The dust suppression device for compressed air foam according to claim 1, characterized in that, The integrated supply unit is a skid-mounted device with an enclosed outer shell. The water inlet of the integrated supply unit is equipped with a manual water inlet valve on the outside. The raw liquid inlet of the integrated supply unit is directly connected to the internal raw liquid booster pump. The integrated supply unit is equipped with a liquid level signal line, an air supply line, a foam liquid line, and a foam liquid line respectively. The inside of the manual water inlet valve is connected to the dosing ratio valve through a water inlet electric valve.

3. The dust suppression device for compressed air foam according to claim 1, characterized in that, The curtain foam generator has a compressed foam generator inside its outer casing. The compressed foam generator is a porous cylindrical material made of high-molecular polymer. The surface of the compressed foam generator has micropores with a porosity of over 80% and a pore size of 5-50 micrometers. The compressed foam generator is submerged in the foam liquid inside the outer casing. The outer casing is cylindrical in shape. Several adjustable lifting rings are vertically arranged at the top of the outer casing. Foam flow equalizers protrude from the front and rear sides of the bottom of the outer casing. A foam overflow port is provided on the upper surface of the outer casing. The foam overflow port is rectangular in shape. An overflow port cover is embedded inside the foam overflow port. The overflow port cover is embedded and protrudes above the foam overflow port. The overflow port cover is positioned inside the foam overflow port by a pneumatic overflow port switch. The front and rear sides of the foam flow equalizer protrude from the front and rear width surfaces of the outer casing.

4. The dust suppression device for compressed air foam according to claim 1, characterized in that, The diluent tank is a mixing output tank. The diluent tank is equipped with a diluent level gauge. The inlet of the diluent tank is connected to the dosing ratio valve, and the outlet of the diluent tank is connected to the dosing pump. The diluent level gauge is connected to the system control box via a wire.

5. The dust suppression device for compressed air foam according to claim 1, characterized in that, The screw air compressor is an air-type output blowing compressor. The air inlet of the screw air compressor is connected to the outer air inlet of the integrated supply unit. The air outlet of the screw air compressor is connected to the air inlet of the curtain foam generator through the air supply pipeline. The screw air compressor is connected to the system control box through the wire.

6. The dust suppression device for compressed air foam according to claim 1, characterized in that, The system control box is a circuit-controlled control box, which is connected to the curtain foam generator, foam concentrate storage tank, diluent tank and screw air compressor control system.

7. The dust suppression device for compressed air foam according to claim 1, characterized in that, The foam raw material storage tank is a multi-layered storage tank. The inside of the foam raw material storage tank is equipped with a raw material storage tank level switch. The inlet of the foam raw material storage tank is connected to the raw material booster pump, and the outlet of the foam raw material storage tank is connected to the dosing proportioning valve. The raw material storage tank level switch is connected to the system control box through a wire.

8. The dust suppression device for compressed air foam according to claim 1, characterized in that, The dosing ratio valve is a dual-port mixing and regulating pump. The inlet of the dosing ratio valve is connected to the water inlet electric valve and the foam concentrate storage tank, respectively, and the outlet of the dosing ratio valve is connected to the diluent tank.

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