A treatment device and method for catalytic ozonation of organic waste gas in investment casting

Abstract

The present invention discloses a treatment device for catalytic ozone oxidation of organic waste gas in investment casting, which includes a swirl plate tower and a waste gas treatment tower; the waste gas treatment tower includes a spraying device, a first packing layer and a gas mixing device, the waste gas treatment tower is provided with an air inlet chamber, the waste gas treatment tower is provided with an ozone generator, and the waste gas treatment tower is provided with an air extraction device; the spraying device includes a connecting cylinder, a water inlet chamber, a turntable and a water tank; the connecting cylinder is provided with a water inlet pipe, and the turntable is provided with a plurality of nozzles; a second packing layer is arranged in the water tank; the gas mixing device is communicated with the air inlet chamber and the ozone generator; the air extraction device includes an air extraction chamber, a motor, the output shaft of the motor is provided with a negative pressure blade, and the air extraction chamber is provided with an air outlet pipe. In the present invention, the air inlet chamber and the ozone generator can release organic waste gas and ozone into the gas mixing device. At the same time, a part of ozone can be dissolved in the alkali solution, enabling the organic waste gas to fully react with the alkali solution and improving the removal effect of VOCs in the organic waste gas.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and particularly to a treatment device and method for catalytic ozone oxidation of organic waste gas in wax mold casting. Background Art

[0002] "Wax mold casting" is a commonly used casting method, and many precision casting industries choose this production process. However, wax mold casting will generate soot and organic waste gas in the waxing, dewaxing, and roasting sections. The waste gas mainly includes VOCs, odor factors, and a small amount of soot, etc. These waste gases will endanger the lives and health of workers, and will also seriously pollute the environment and affect the normal life of humans. Therefore, it is necessary to treat the generated waste gas during production.

[0003] At present, there are many methods for waste gas treatment, such as combustion methods (including direct combustion, thermal combustion, catalytic combustion), adsorption methods, plasma methods, and biodegradation, etc. After analysis, the combustion method has disadvantages such as high energy consumption and difficulty in passing safety evaluation; the adsorption method has the problem of secondary pollution; the plasma method has disadvantages such as high energy consumption and low purification efficiency; the biodegradation has poor removal effects on aromatic hydrocarbons and sulfur oxides. Therefore, the present invention develops a simple, efficient, and low-cost organic waste gas treatment technology. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a treatment device and method for catalytic ozone oxidation of organic waste gas in wax mold casting.

[0005] The technical solution of the present invention is: a treatment device for catalytic ozone oxidation of organic waste gas in wax mold casting, including a swirl plate tower and a waste gas treatment tower;

[0006] The waste gas treatment tower includes a spraying device, a first packing layer, and a gas mixing device arranged in sequence from top to bottom. An air inlet chamber is arranged on one side of the waste gas treatment tower, an ozone generator is arranged on the other side of the waste gas treatment tower, and an air extraction device is arranged on the top surface of the waste gas treatment tower; the air outlet of the swirl plate tower is communicated with the air inlet chamber through a pipeline;

[0007] The spraying device includes a connecting cylinder horizontally arranged in the waste gas treatment tower, a water inlet chamber arranged in the connecting cylinder, a turntable arranged directly below the connecting cylinder, and a water tank arranged outside the waste gas treatment tower;

[0008] One side of the connecting cylinder is fixedly connected to the inner wall of the waste gas treatment tower, the other side of the connecting cylinder is provided with a water inlet pipe communicated with it, the water inlet pipe passes through the side wall of the waste gas treatment tower and is communicated with the water tank, and an opening corresponding to the water inlet pipe is arranged on the side wall of the water inlet chamber;

[0009] A plurality of spray nozzles are vertically provided on the turntable, and the plurality of spray nozzles are all communicated with the bottom surface of the water inlet chamber through pipelines; the water tank is communicated with the ozone generator through a pipeline, and a second filler layer for promoting the dissolution of ozone is provided in the water tank;

[0010] Both ends of the gas mixing device are communicated with the air inlet chamber and the ozone generator respectively; the air extraction device includes an air extraction chamber provided on the top surface of the waste gas treatment tower and communicated with it. An electric motor is provided on the outer top surface of the air extraction chamber. The output shaft of the electric motor passes through the top surface of the air extraction chamber and is sleeved with a negative pressure blade. An air outlet pipe is provided on the side wall of the air extraction chamber.

[0011] Note: The air inlet chamber and the ozone generator of the above device can release organic waste gas and ozone into the gas mixing device. At the same time, a part of the ozone can enter the water tank and dissolve in the lye, so that more hydroxyl radicals are converted in the lye, enabling the organic waste gas to fully react with the lye and improving the removal effect of VOCs in the organic waste gas.

[0012] Furthermore, catalytic fillers are filled in both the first filler layer and the second filler layer, and the catalytic filler is manganese oxide.

[0013] Note: Manganese oxide can catalyze the reaction between ozone and organic waste gas to increase the reaction rate.

[0014] Furthermore, the gas mixing device includes a mixing chamber, an exhaust pipe provided on the top surface of the mixing chamber and communicated with the mixing chamber, and two inlet pipes respectively provided on both sides of the mixing chamber;

[0015] The two inlet pipes are arranged in central symmetry, and one end of each of the two inlet pipes extends into the interior of the mixing chamber. Air outlet holes are provided on the side walls of the inlet pipes located in the mixing chamber. The other ends of the two inlet pipes pass through the side wall of the waste gas treatment tower and are correspondingly communicated with the air inlet chamber and the ozone generator. Pistons that control the opening or closing of the air outlet holes by sliding left and right are slidably and sealingly connected in both inlet pipes. A spring is provided between one of the inlet pipes and the piston, and a clamping device for clamping the piston is provided on the side wall of the one inlet pipe;

[0016] Rack bars are horizontally provided on both of the two pistons. The two rack bars respectively pass through the corresponding inlet pipes and extend into the mixing chamber. A rotating shaft is vertically provided in the mixing chamber. A gear for simultaneously meshing with the two rack bars is sleeved on the rotating shaft. The lower end of the rotating shaft is rotatably connected to the bottom surface of the mixing chamber. Stirring blades are sleeved on the rotating shaft, and a thread is provided at the upper end of the rotating shaft;

[0017] A plurality of exhaust holes are provided on the side wall of the exhaust pipe, and a slider that controls the opening or closing of the exhaust holes by sliding up and down is slidably provided in the exhaust pipe. The upper end of the rotating shaft passes through the slider and is threadedly connected to the slider.

[0018] Description: After the air pressure in the intake chamber of the above-mentioned gas mixing device increases, the piston in one intake pipe will gradually move. Under the cooperation of the rack and the gear, the piston in the other intake pipe will move synchronously, enabling the organic waste gas and ozone to enter the mixing chamber simultaneously. When the piston returns to its original position, the gear will drive the rotating shaft to make the stirring blades rotate, so that the organic waste gas and ozone are evenly mixed. When the piston returns to its original position, the slider will slide upward, enabling the mixed gas to be released from the exhaust hole. Since ozone can be released synchronously with the organic waste gas without manual operation, it is convenient to use. Moreover, ozone and the organic waste gas can be evenly mixed under the action of the stirring blades, enabling the VOCs in the organic waste gas to fully react with ozone, ensuring the treatment effect of the organic waste gas.

[0019] Further, the clamping device includes a vertical pipe provided on the side wall of one of the intake pipes and communicating with it, a limiting block, a partition plate, and a clamping column sequentially arranged in the vertical pipe from top to bottom;

[0020] The limiting block is slidably connected to the vertical pipe, and a connecting rod is provided on the limiting block. The connecting rod passes through the partition plate and is fixedly connected to the clamping column;

[0021] The partition plate is fixedly connected to the vertical pipe, the clamping column is slidably connected to the vertical pipe, and an electric push rod for pushing the limiting block to slide upward is provided on the partition plate. A spring is sleeved on the connecting rod between the partition plate and the clamping column, and a clamping hole for slidably cooperating with the clamping column for clamping is provided on the side wall of the piston.

[0022] Description: When the piston moves to the position of the clamping device, the clamping column will slide upward and automatically clamp with the piston to keep the position of the piston stable, preventing the piston from moving randomly. Moreover, the electric push rod can be extended to push the limiting block, so that the clamping column no longer clamps the piston.

[0023] Further, the end of the piston corresponding to the clamping column is chamfered.

[0024] Description: The chamfered piston is easy to push the clamping column upward, preventing the piston from not being clamped by the clamping column and improving the use stability of the device.

[0025] Further, the water inlet chamber is rotationally and hermetically connected to the connecting cylinder, and the lower end of the output shaft of the motor sequentially passes through the water inlet chamber and the turntable and is rotationally and hermetically connected to the water inlet chamber;

[0026] A through hole is horizontally provided on the output shaft at the corresponding position of the turntable. A second airbag is provided in the through hole. One end of the second airbag is provided with a sliding column for controlling the clamping or separation from the turntable by its inflation and deflation. A gas channel communicating with the second airbag is vertically provided on the output shaft;

[0027] A third airbag is provided between the top surface of the exhaust pipe and the slider. The third airbag is communicated with the gas channel through a trachea, and the trachea is rotatably connected to the gas channel.

[0028] Explanation: After the slider slides upward to open the exhaust pipe, the slider will squeeze the third airbag, causing the gas in the third airbag to enter the second airbag to push the sliding column to engage with the turntable, enabling the motor to drive the turntable and the water inlet chamber to rotate. The water inlet chamber can be continuously connected to the water inlet pipe during rotation, so that the nozzle sprays the alkali solution only when the exhaust pipe exhausts, reducing the waste of the alkali solution. At the same time, the nozzle can spray the alkali solution following the rotation of the turntable to increase the spraying range of the alkali solution.

[0029] Furthermore, the lower end of the output shaft of the motor extends above the first packing layer and is sleeved with a cleaning plate that uses the rotation of the output shaft to clean the first packing layer.

[0030] Explanation: The cleaning plate can clean the surface of the first packing layer to prevent the first packing layer from being blocked by impurities.

[0031] On the other hand, the present invention provides a method for treating organic waste gas using the above treatment device, including the following steps:

[0032] S1. The organic waste gas during the wax mold casting process is collected and enters the cyclone plate tower. After the cyclone plate tower cools down and removes dust from the organic waste gas, it enters the air inlet chamber through a pipeline;

[0033] S2. The waste gas in the air inlet chamber is mixed with a part of the ozone generated by the ozone generator in the gas mixing device, so that a part of the pollutants in the waste gas are oxidized by the ozone. After the mixing is completed, a mixed gas is obtained, and the mixed gas is discharged into the waste gas treatment tower through the gas mixing device;

[0034] S3. Another part of the ozone generated by the ozone generator enters the water tank through a pipeline and is dissolved in the alkali solution in the water tank to generate hydroxyl radicals;

[0035] S4. Start the motor, and the motor drives the negative pressure blades to rotate, causing the mixed gas to move upward. The alkali solution in the water tank enters the water inlet chamber through the water inlet pipe and is sprayed through the nozzle;

[0036] S5. The mixed gas will contact the alkali solution, and another part of the pollutants in the mixed gas are further removed under the action of the alkali solution. Subsequently, the mixed gas is discharged from the air outlet pipe under the action of the negative pressure blades.

[0037] Explanation: In the above method, a part of the ozone can follow the organic waste gas and be released into the gas mixing device, and be evenly mixed under the action of the gas mixing device. Another part can be dissolved in the alkali solution to generate hydroxyl radicals in the alkali solution to ensure the removal effect of VOCs.

[0038] Furthermore, the lye is a sodium hydroxide solution with a mass concentration of 10-15%, and the temperature of the sodium hydroxide solution is 20-30°C.

[0039] Note: The above-mentioned concentration and temperature of sodium hydroxide have a good caustic washing effect and can thoroughly remove sulfides.

[0040] The beneficial effects of the present invention are as follows:

[0041] (1) The air inlet chamber and ozone generator of the device of the present invention can release organic waste gas and ozone into the gas mixing device. At the same time, a part of the ozone can enter the water tank and dissolve in the lye, so that more hydroxyl radicals are converted in the lye, enabling the organic waste gas to fully react with the lye and improving the removal effect of VOCs in the organic waste gas.

[0042] (2) The gas mixing device of the present invention can make the piston in one intake pipe gradually move as the air pressure in the air inlet chamber increases. Under the cooperation of the rack and gear, the pistons in the two intake pipes will move synchronously, enabling the ozone to be released synchronously with the organic waste gas without manual operation, which is convenient to use. And when the piston returns to its original position, the ozone and organic waste gas can be evenly mixed under the action of the stirring blades, enabling the VOCs in the organic waste gas to react evenly with the ozone, ensuring the treatment effect of the organic waste gas.

[0043] (3) After the slider slides upward to open the exhaust pipe, the slider will squeeze the third airbag, causing the gas in the third airbag to enter the second airbag to push the sliding column to engage with the turntable, enabling the motor to drive the turntable and the water inlet chamber to rotate. The water inlet chamber can be continuously connected to the intake pipe during the rotation process, so that the spray head sprays the lye only when the exhaust pipe exhausts, reducing the waste of lye. At the same time, the spray head can spray the lye following the rotation of the turntable to increase the spraying range of the lye.

[0044] (4) In the method of the present invention, a part of the ozone can be released into the gas mixing device following the organic waste gas and evenly mixed under the action of the gas mixing device, and the other part can dissolve in the lye to generate hydroxyl radicals in the lye to ensure the removal effect of VOCs. Description of the Drawings

[0045] Figure 1 is the overall structural schematic diagram of Embodiment 1 of the present invention;

[0046] Figure 2 is the structural schematic diagram of the waste gas treatment tower of Embodiment 1 of the present invention;

[0047] Figure 3 is the cross-sectional view of the gas mixing device of Embodiment 1 of the present invention;

[0048] Figure 4 is the internal structural schematic diagram of the mixing chamber of Embodiment 1 of the present invention;

[0049] Figure 5 It is a cross-sectional view of the intake pipe in Embodiment 1 of the present invention;

[0050] Figure 6 is Figure 5 an enlarged view of part A of

[0051] Figure 7 It is a cross-sectional view of the exhaust pipe in Embodiment 1 of the present invention;

[0052] Figure 8 It is a schematic structural diagram of the spraying device in Embodiment 1 of the present invention;

[0053] Figure 9 It is a schematic structural diagram of the water tank in Embodiment 1 of the present invention;

[0054] Figure 10 It is a cross-sectional view of the exhaust pipe in Embodiment 2 of the present invention;

[0055] Figure 11 It is a cross-sectional view of the spraying device in Embodiment 2 of the present invention;

[0056] Figure 12 is Figure 11 an enlarged view of part B of

[0057] Figure 13 It is a schematic structural diagram of the cleaning plate in Embodiment 3 of the present invention;

[0058] Wherein, 1 - cyclone plate tower, 2 - waste gas treatment tower, 21 - intake chamber, 22 - ozone generator, 23 - first packing layer, 24 - air extraction chamber, 241 - outlet pipe, 25 - motor, 251 - negative pressure blade, 252 - second airbag, 253 - sliding column, 254 - cleaning plate, 26 - drain pipe, 3 - gas mixing device, 31 - mixing chamber, 32 - exhaust pipe, 321 - third airbag, 33 - intake pipe, 331 - vertical pipe, 332 - connecting rod, 333 - clamping column, 334 - limiting block, 335 - electric push rod, 336 - partition plate, 34 - rotating shaft, 341 - gear, 342 - stirring blade, 35 - piston, 351 - rack, 36 - slider, 4 - spraying device, 41 - connecting cylinder, 42 - water inlet chamber, 43 - water inlet pipe, 44 - turntable, 45 - nozzle, 46 - water tank, 461 - second packing layer. Specific Embodiments

[0059] The present invention will be further described in detail below in conjunction with specific embodiments to better reflect the advantages of the present invention.

[0060] Embodiment 1

[0061] As Figure 1 shown, a device for treating organic waste gas from catalytic ozone oxidation of wax mold casting includes a cyclone plate tower 1 and a waste gas treatment tower 2. The cyclone plate tower 1 is a product of the prior art;

[0062] As Figure 2 shown, the waste gas treatment tower 2 includes a spraying device 4, a first packing layer 23, and a gas mixing device 3 arranged in sequence from top to bottom. An air inlet chamber 21 is arranged on the left side of the waste gas treatment tower 2, and an ozone generator 22 is arranged on the right side of the waste gas treatment tower 2. The ozone generator 22 is a product of the prior art. An air extraction device is arranged on the top surface of the waste gas treatment tower 2. The air outlet of the cyclone plate tower 1 is communicated with the air inlet chamber 21 through a pipeline;

[0063] As Figure 8 shown, the spraying device 4 includes a connecting cylinder 41 horizontally arranged in the waste gas treatment tower 2, a water inlet chamber 42 arranged in the connecting cylinder 41, a turntable 44 arranged directly below the connecting cylinder 41, and a water tank 46 arranged outside the waste gas treatment tower 2;

[0064] The left side of the connecting cylinder 41 is fixedly connected to the inner wall of the waste gas treatment tower 2. The right side of the connecting cylinder 41 is provided with a water inlet pipe 43 communicated with it. The water inlet pipe 43 passes through the side wall of the waste gas treatment tower 2 and is communicated with the water tank 46. An opening corresponding to the water inlet pipe 43 is arranged on the side wall of the water inlet chamber 42;

[0065] Two spray heads 45 are vertically arranged on the turntable 44. Both of the two spray heads 45 are communicated with the bottom surface of the water inlet chamber 42 through pipelines; As Figure 9 shown, the water tank 46 is communicated with the ozone generator 22 through a pipeline. A second packing layer 461 for promoting the dissolution of ozone is arranged in the water tank 46;

[0066] Catalytic packing is filled in both the first packing layer 23 and the second packing layer 461. The catalytic packing is manganese oxide;

[0067] Both ends of the gas mixing device 3 are communicated with the air inlet chamber 21 and the ozone generator 22 respectively. The air extraction device includes an air extraction chamber 24 arranged on the top surface of the waste gas treatment tower 2 and communicated with it. An electric motor 25 is arranged on the outer top surface of the air extraction chamber 24. The electric motor 25 is a product of the prior art. The output shaft of the electric motor 25 passes through the top surface of the air extraction chamber 24 and is sleeved with a negative pressure blade 251. An air outlet pipe 241 is arranged on the side wall of the air extraction chamber 24;

[0068] As Figure 3 , 4 shown, the gas mixing device 3 includes a mixing chamber 31, an exhaust cylinder 32 arranged on the top surface of the mixing chamber 31 and communicated with it, and two air inlet pipes 33 respectively arranged on both sides of the mixing chamber 31;

[0069] As Figure 5As shown, the two intake pipes 33 are arranged in central symmetry, and the right ends of the two intake pipes 33 both extend into the mixing chamber 31. Air outlet holes are provided on the side walls of the intake pipes 33 located in the mixing chamber 31. The left ends of the two intake pipes 33 both pass through the side wall of the waste gas treatment tower 2 and are correspondingly communicated with the air intake chamber 21 and the ozone generator 22. Pistons 35 that control the opening or closing of the air outlet holes by sliding left and right are slidably and sealingly connected in the two intake pipes 33. A spring is provided between the left intake pipe 33 and the piston 35, and a clamping device for clamping with the piston 35 is provided on the side wall of the left intake pipe 33;

[0070] Racks 351 are horizontally provided on both of the pistons 35. The two racks 351 respectively pass through the corresponding intake pipes 33 and extend into the mixing chamber 31. A rotating shaft 34 is vertically provided in the mixing chamber 31. A gear 341 that meshes with the two racks 351 simultaneously is sleeved on the rotating shaft 34. The lower end of the rotating shaft 34 is rotatably connected to the bottom surface of the mixing chamber 31. Stirring blades 342 are sleeved on the rotating shaft 34, and a thread is provided at the upper end of the rotating shaft 34;

[0071] As Figure 7 shown, six exhaust holes are provided on the side wall of the exhaust pipe 32. A slider 36 that controls the opening or closing of the exhaust holes by sliding up and down is slidably provided in the exhaust pipe 32. The upper end of the rotating shaft 34 passes through the slider 36 and is threadedly connected to the slider 36;

[0072] As Figure 6 shown, the clamping device includes a vertical pipe 331 provided on the side wall of the left intake pipe 33 and communicated with it. A limit block 334, a partition plate 336, and a clamping column 333 are sequentially provided in the vertical pipe 331 from top to bottom;

[0073] The limit block 334 is slidably connected to the vertical pipe 331, and a connecting rod 332 is provided on the limit block 334. The connecting rod 332 passes through the partition plate 336 and is fixedly connected to the clamping column 333;

[0074] The partition plate 336 is fixedly connected to the vertical pipe 331. The clamping column 333 is slidably connected to the vertical pipe 331. An electric push rod 335 for pushing the limit block 334 to slide upward is provided on the partition plate 336. The electric push rod 335 uses an existing technical product. A spring is sleeved on the connecting rod 332 located between the partition plate 336 and the clamping column 333. A clamping hole for slidably cooperating with the clamping column 333 for clamping is provided on the side wall of the piston 35; One end of the piston 35 corresponding to the clamping column 333 is chamfered;

[0075] The method for treating organic waste gas using the above treatment device includes the following steps:

[0076] S1. The organic waste gas in the wax mold casting process is collected and enters the cyclone plate tower 1. After the cyclone plate tower 1 cools down and removes dust from the organic waste gas, it enters the air inlet chamber 21 through a pipeline.

[0077] S2. The waste gas in the air inlet chamber 21 is mixed with a part of the ozone produced by the ozone generator 22 in the gas mixing device 3, so that a part of the pollutants in the waste gas are oxidized by the ozone. After the mixing is completed, the mixed gas is obtained, and the mixed gas is discharged into the waste gas treatment tower through the gas mixing device 3.

[0078] S3. Another part of the ozone produced by the ozone generator 22 enters the water tank 46 through a pipeline and is dissolved in the alkali solution in the water tank 46 to generate hydroxyl radicals.

[0079] S4. Start the motor 25. The motor 25 drives the negative pressure blade 251 to rotate, so that the mixed gas moves upward. The alkali solution in the water tank 46 enters the water inlet chamber 42 through the water inlet pipe 43 and is sprayed through the nozzle 45.

[0080] S5. The mixed gas will contact the alkali solution, and another part of the pollutants in the mixed gas are further removed under the action of the alkali solution. Then the mixed gas is discharged from the air outlet pipe 241 under the action of the negative pressure blade 251.

[0081] The alkali solution is a sodium hydroxide solution with a mass concentration of 12%, and the temperature of the sodium hydroxide solution is 25°C.

[0082] It can be understood that the sum of the above-mentioned "a part" and "another part" is the total ozone or pollutants.

[0083] The working principle of the above gas mixing device is as follows: As the air pressure in the air inlet chamber 21 increases, the piston 35 corresponding to the left air inlet pipe 33 slides to the right under the action of the air pressure. The piston 35 will drive the left rack 351 to move to the right, so that the gear 341 drives the rotating shaft 34 to rotate clockwise. The right rack 351 will move to the left under the action of the rotation of the gear 341, so that the piston 35 corresponding to the right air inlet pipe 33 can slide to the left synchronously.

[0084] During the clockwise rotation of the rotating shaft 34, the slider 36 will slide downward in threaded cooperation with the rotating shaft 34 to close the exhaust cylinder 32. When the piston 35 in the left air inlet pipe 33 moves to the right of the corresponding air outlet hole, the piston 35 will be clamped with the clamping column 333. At this time, the piston 35 in the right air inlet pipe 33 moves to the left of the corresponding air outlet hole, so that the waste gas and ozone are released into the mixing chamber 31 synchronously.

[0085] After the exhaust gas and ozone are released, control the electric push rod 335 to extend so that the clamping post 333 no longer clamps the piston 35. The left piston 35 starts to reset under the action of the spring. When the left piston 35 resets, it will drive the left rack 351 to move to the left, causing the rotating shaft 34 to rotate counterclockwise. When the rotating shaft 34 rotates, it will drive the stirring blade 342 to rotate, so that the exhaust gas and ozone are evenly mixed to obtain a mixed gas. Moreover, the slider 36 will slide upward in threaded cooperation with the rotating shaft 34 to open the exhaust pipe 32, so that the mixed gas is discharged through the exhaust hole.

[0086] Embodiment 2

[0087] As Figure 10 、 11 shown, this embodiment is basically the same as Embodiment 1. The difference is that the water inlet chamber 42 is rotatably and sealingly connected to the connecting cylinder 41. The water inlet chamber 42 is rotatably connected to the annular groove provided on the inner wall of the connecting cylinder 41 through a connecting ring sleeved thereon. The lower end of the output shaft of the motor 25 sequentially passes through the water inlet chamber 42 and the turntable 44 and is rotatably and sealingly connected to the water inlet chamber 42.

[0088] As Figure 12 shown, a through hole is horizontally provided on the output shaft corresponding to the position of the turntable 44. A second airbag 252 is provided in the through hole. A sliding column 253 for controlling the clamping or separation from the turntable 44 by inflating and deflating it is provided at the right end of the second airbag 252. A gas passage communicating with the second airbag 252 is vertically provided on the output shaft.

[0089] A third airbag 321 is provided between the top surface of the exhaust pipe 32 and the slider 36. The third airbag 321 is communicated with the gas passage through a trachea, and the trachea is rotatably connected to the gas passage. The trachea passes through the first packing layer 23.

[0090] The working principle of the above spray device is as follows: The first packing layer 23 can assist in fixing the trachea. In the initial state, the opening of the water inlet chamber 42 is not aligned with the water inlet pipe 43. At this time, the water inlet pipe 43 and the water inlet chamber 42 are not communicated. When the rotating shaft 34 rotates counterclockwise, the slider 36 will slide upward to open the exhaust pipe 32 to discharge the mixed gas. At the same time, the slider 36 will squeeze the third airbag 321. The gas in the third airbag 321 will be filled into the second airbag 252 through the trachea and the gas passage, so that the second airbag 252 is inflated to push the sliding column 253 out to be clamped with the turntable 44. At this time, the motor 25 can drive the turntable 44 and the water inlet chamber 42 to rotate together. During the rotation of the water inlet chamber 42, the opening can be continuously connected to the water inlet pipe 43, so that the sodium hydroxide solution in the water inlet pipe 43 can enter the spray head 45 for spraying, and at the same time, the turntable can drive the spray head 45 to rotate.

[0091] Embodiment 3

[0092] As Figure 13As shown, this embodiment is basically the same as Embodiment 2, except that the lower end of the output shaft of the motor 25 extends above the first packing layer 23 and is sleeved with a cleaning plate 254 that uses the rotation of the output shaft to clean the first packing layer 23.

[0093] The working principle of the above-mentioned cleaning plate 254 is as follows: when the motor 25 rotates, it will drive the cleaning plate 254 to rotate, and when the cleaning plate 254 rotates, it will clean the upper surface of the first packing layer 23.

Claims

1. A treatment device for catalytic ozonation of organic waste gas in investment casting, characterized in that, It includes a cyclone plate tower (1) and an exhaust gas treatment tower (2); The exhaust gas treatment tower (2) includes a spraying device (4), a first packing layer (23), and a gas mixing device (3) arranged in sequence from top to bottom. An air inlet chamber (21) is arranged on one side of the exhaust gas treatment tower (2), an ozone generator (22) is arranged on the other side of the exhaust gas treatment tower (2), and an air extraction device is arranged on the top surface of the exhaust gas treatment tower (2); The air outlet of the cyclone plate tower (1) is communicated with the air inlet chamber (21) through a pipeline; The spraying device (4) includes a connecting cylinder (41) horizontally arranged in the exhaust gas treatment tower (2), a water inlet chamber (42) arranged in the connecting cylinder (41), a turntable (44) arranged directly below the connecting cylinder (41), and a water tank (46) arranged outside the exhaust gas treatment tower (2); One side of the connecting cylinder (41) is fixedly connected to the inner wall of the exhaust gas treatment tower (2), and the other side of the connecting cylinder (41) is provided with a water inlet pipe (43) communicated with it. The water inlet pipe (43) passes through the side wall of the exhaust gas treatment tower (2) and is communicated with the water tank (46). An opening corresponding to the water inlet pipe (43) is arranged on the side wall of the water inlet chamber (42); A plurality of spray heads (45) are vertically arranged on the turntable (44), and the plurality of spray heads (45) are all communicated with the bottom surface of the water inlet chamber (42) through pipelines; The water tank (46) is communicated with the ozone generator (22) through a pipeline, and a second packing layer (461) for promoting ozone dissolution is arranged in the water tank (46); The gas mixing device (3) is communicated with the air inlet chamber (21) and the ozone generator (22) at both ends respectively; The air extraction device includes an air extraction chamber (24) arranged on the top surface of the exhaust gas treatment tower (2) and communicated with it. A motor (25) is arranged on the outer top surface of the air extraction chamber (24). The output shaft of the motor (25) passes through the top surface of the air extraction chamber (24) and is sleeved with a negative pressure blade (251). An air outlet pipe (241) is arranged on the side wall of the air extraction chamber (24); The gas mixing device (3) includes a mixing chamber (31), an exhaust cylinder (32) arranged on the top surface of the mixing chamber (31) and communicated with the mixing chamber (31), and two air inlet pipes (33) respectively arranged on both sides of the mixing chamber (31); The two air inlet pipes (33) are arranged in central symmetry, and one end of each of the two air inlet pipes (33) extends into the interior of the mixing chamber (31). Air outlet holes are arranged on the side walls of the air inlet pipes (33) located in the mixing chamber (31). The other ends of the two air inlet pipes (33) pass through the side wall of the exhaust gas treatment tower (2) and are correspondingly communicated with the air inlet chamber (21) and the ozone generator (22). Pistons (35) that control the opening or closing of the air outlet holes by sliding left and right are slidably and sealingly connected in the two air inlet pipes (33). A spring is arranged between one of the air inlet pipes (33) and the piston (35), and a clamping device for clamping with the piston (35) is arranged on the side wall of the one air inlet pipe (33); Racks (351) are horizontally provided on both of the two pistons (35). The two racks (351) respectively pass through the corresponding intake pipes (33) and extend into the mixing chamber (31). A rotating shaft (34) is vertically provided in the mixing chamber (31). A gear (341) for meshing with the two racks (351) simultaneously is sleeved on the rotating shaft (34). The lower end of the rotating shaft (34) is rotatably connected to the bottom surface of the mixing chamber (31). Stirring blades (342) are sleeved on the rotating shaft (34), and a thread is provided at the upper end of the rotating shaft (34). A plurality of exhaust holes are provided on the side wall of the exhaust pipe (32). A slider (36) for controlling the opening or closing of the exhaust holes by sliding up and down is slidably provided in the exhaust pipe (32). The upper end of the rotating shaft (34) passes through the slider (36) and is threadedly connected to the slider (36).

2. The treatment device for catalytic ozone oxidation of organic waste gas in investment casting according to claim 1, wherein, Catalytic fillers are filled in both the first filler layer (23) and the second filler layer (461). The catalytic filler is manganese oxide.

3. The treatment device for catalytic ozone oxidation of organic waste gas in investment casting according to claim 1, wherein, The clamping device includes a vertical pipe (331) provided on the side wall of one of the intake pipes (33) and communicating with it, a limiting block (334), a partition plate (336), and a clamping post (333) sequentially arranged in the vertical pipe (331) from top to bottom. The limiting block (334) is slidably connected to the vertical pipe (331). A connecting rod (332) is provided on the limiting block (334). The connecting rod (332) passes through the partition plate (336) and is fixedly connected to the clamping post (333). The partition plate (336) is fixedly connected to the vertical pipe (331). The clamping post (333) is slidably connected to the vertical pipe (331). An electric push rod (335) for pushing the limiting block (334) to slide upward is provided on the partition plate (336). A spring is sleeved on the connecting rod (332) between the partition plate (336) and the clamping post (333). A clamping hole for slidably cooperating with the clamping post (333) is provided on the side wall of the piston (35).

4. The treatment device for catalytic ozone oxidation of organic waste gas in wax mold casting according to claim 3, wherein, One end of the piston (35) corresponding to the clamping post (333) is chamfered.

5. The treatment device for catalytic ozone oxidation of organic waste gas in investment casting according to claim 1, wherein, The water inlet chamber (42) is rotatably and sealingly connected to the connecting cylinder (41). The lower end of the output shaft of the motor (25) sequentially passes through the water inlet chamber (42) and the turntable (44) and is rotatably and sealingly connected to the water inlet chamber (42). A through hole is horizontally provided on the output shaft at the corresponding position of the turntable (44). A second airbag (252) is provided in the through hole. A sliding column (253) for controlling the clamping or separation from the turntable (44) by its inflation and deflation is provided at one end of the second airbag (252). A gas passage communicating with the second airbag (252) is vertically provided on the output shaft. A third airbag (321) is provided between the top surface of the exhaust pipe (32) and the slider (36). The third airbag (321) is communicated with the gas passage through a trachea, and the trachea is rotatably connected to the gas passage.

6. The treatment device for catalytic ozonation of organic waste gas in investment casting according to claim 5, characterized in that, The lower end of the output shaft of the motor (25) extends above the first filler layer (23) and is sleeved with a cleaning plate (254) for cleaning the first filler layer (23) by the rotation of the output shaft.

7. The treatment method for catalytic ozonation of organic waste gas in wax mold casting by using the treatment device according to any one of claims 1 to 6, characterized in that, Including the following steps: S1. The organic waste gas during the investment casting process is collected and enters the cyclone plate tower (1). After the cyclone plate tower (1) cools down and removes dust from the organic waste gas, it enters the air inlet chamber (21) through a pipeline. S2. The waste gas in the air inlet chamber (21) is mixed with a part of the ozone produced by the ozone generator (22) in the gas mixing device (3), so that a part of the pollutants in the waste gas are oxidized by the ozone. After the mixing is completed, a mixed gas is obtained, and the mixed gas is discharged into the waste gas treatment tower through the gas mixing device (3). S3. Another part of the ozone produced by the ozone generator (22) enters the water tank (46) through a pipeline and is dissolved in the alkali solution in the water tank (46) to generate hydroxyl radicals. S4. Start the motor (25). The motor (25) drives the negative pressure blade (251) to rotate, so that the mixed gas moves upward. The alkali solution in the water tank (46) enters the water inlet chamber (42) through the water inlet pipe (43) and is sprayed through the nozzle (45). S5. The mixed gas contacts the alkali solution, and another part of the pollutants in the mixed gas are further removed under the action of the alkali solution. Subsequently, the mixed gas is discharged from the air outlet pipe (241) under the action of the negative pressure blade (251).

8. The treatment method for catalytic ozonation of organic waste gas in investment casting according to claim 7, characterized in that, The alkali solution is a sodium hydroxide solution with a mass concentration of 10-15%, and the temperature of the sodium hydroxide solution is 20-30°C.

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