A method and apparatus for treating exhaust gases using high boiling point mineral oil

Abstract

The present application relates to the field of waste gas treatment, specifically to a method and device for treating waste gas by using high-boiling point mineral oil, comprising a gas washing tank, an air inlet is arranged below the gas washing tank, an air outlet one is arranged above the gas washing tank, a cleaning device for treating volatile organic compounds in industrial waste gas is arranged inside the gas washing tank, the cleaning device comprises a storage box for storing cleaning agent, the cleaning agent is high-boiling point organic mineral oil, a material extraction device one is connected between the storage box and the gas washing tank, and a valve one is arranged between the material extraction device one and the gas washing tank. By arranging the gas washing tank and the recovery device, the high-boiling point organic mineral oil is used to treat industrial waste gas, and the recovery device is used to recover and reuse the cleaning agent, so that the volatile organic compounds are treated and the cleaning agent is recovered and reused, and the equipment use cost is obviously reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of waste gas treatment, in particular to a method and device for treating waste gas by using high-boiling point mineral oil. BACKGROUND

[0002] In the chemical industry, industrial waste gas contains a large amount of volatile organic compounds, which will cause serious harm to the surrounding environment if not treated and directly discharged.

[0003] The common treatment methods for volatile organic compounds include activated carbon adsorption, combustion, condensation and solvent absorption. The activated carbon adsorption is indiscriminate adsorption, which makes the activated carbon adsorption efficiency low and needs to be replaced frequently. The activated carbon adsorption is troublesome when replacing the activated carbon, and the number of times of using the activated carbon is limited, resulting in increased use cost. The combustion method requires large initial equipment investment, and the equipment used in the combustion method has large running power. The combustion method indiscriminately treats the waste gas, resulting in increased use cost. The condensation method needs additional refrigeration equipment, which has large investment, high energy consumption and large operation cost. In addition, the tail gas after condensation still contains a certain concentration of organic matter, which causes serious secondary pollution. Therefore, the condensation method is rarely used for low-concentration tail gas treatment.

[0004] To realize targeted treatment of volatile organic compounds, solvent absorption is usually used in industry. The solvent absorption method usually uses acid-base reagents to treat volatile organic compounds in waste gas. Since volatile organic compounds are insoluble in water, the liquid phase resistance in the spray tower is large, which makes the absorption efficiency of acid-base reagents to volatile organic compounds low. In addition, the acid-base reagents are not easy to recover, resulting in increased equipment use cost. The used acid-base reagents are directly discharged, which causes secondary pollution to the environment.

[0005] Therefore, a method and device for treating waste gas by using high-boiling point mineral oil are provided. SUMMARY

[0006] The present application aims to provide a method and device for treating waste gas by using high-boiling point mineral oil. By providing a gas washing tank and a recovery device, the industrial waste gas is treated by high-boiling point organic mineral oil in the gas washing tank, and the cleaning agent is recovered by the recovery device for reuse, so as to solve the problems in the background technology.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] A method for treating waste gas by using high-boiling point mineral oil, comprising the following steps:

[0009] s1: first, add a cleaning agent to the storage box, open the vacuum device, and open the valve one and the material extraction device one;

[0010] s2: the exhaust gas is introduced, and the second material suction device is opened;

[0011] s3: the exhaust gas cleaning reaches 20-30 minutes, the heating device is started, and the water in the water tank is heated;

[0012] s4: heating reaches 5-10 minutes, the third material suction device is started, and the water in the water tank enters the heating layer to preheat the distillation tank;

[0013] s5: the exhaust gas cleaning reaches 30-60 minutes, the fourth valve and the fifth valve are opened, and the washing agent in the washing tank is transferred to the distillation tank through vacuum adsorption;

[0014] s6: the liquid level detected by the liquid level meter reaches 20-30 cm, the fourth valve and the fifth valve are closed, the second valve is opened, the distillation tank is connected with the treatment device, and the first material suction device is started again;

[0015] s7: heating for 20-30 minutes, the third material suction device stops working, and the fourth material suction device is started;

[0016] s8: the third valve is closed and the fourth material suction device stops working;

[0017] s9: the equipment is used for 3-4 months, the driving device is started to drive the rotating shaft to rotate forward, the control connector is connected with the compressed gas tank, the connection time is 10 s, the washing agent is introduced into the liquid inlet, and the filler is soaked.

[0018] s10: the filler is soaked for 10-20 minutes, the liquid outlet is opened, the washing agent is introduced into the liquid inlet to flush the filler, the flushing time is 3-6 minutes, and then clean water is introduced to flush the filler, and the flushing time is 3-6 minutes.

[0019] s11: the driving device is controlled to rotate reversely, the control connector is connected with the compressed gas tank, the connection time is 10 s, and the driving device stops running after 15 s.

[0020] The utility model provides a device of a kind of waste gas treatment method using high-boiling point mineral oil, including gas washing jar, the gas washing jar is fixedly installed on ground by anchor bolt, gas inlet is equipped under the gas washing jar, exhaust port one is equipped above the gas washing jar, the inside of gas washing jar is equipped with cleaning device for the targeted treatment of volatile organic compounds in industrial waste gas, the cleaning device includes material storage box, the material storage box is placed on ground, the material storage box is used to store cleaning agent, cleaning agent is high-boiling point organic mineral oil, high-boiling point organic mineral oil is mainly high carbon chain alkane, it is the mixture of liquid hydrocarbon obtained by petroleum distillation, such as white oil, other high-boiling point organic mineral oil can also be used in the utility model, just need to realize the targeted treatment of volatile organic compounds and not easy to evaporate and can be reused, the material storage box is connected with pumping device one between the gas washing jar, the pumping device one is rotor pump, the pumping device one is equipped with valve one at the connection of pumping device two, the valve one is solenoid valve, the gas washing jar is welded with mounting bracket one, a plurality of spray heads are bolted on the upper side of mounting bracket one, the spray head uses atomizing spray head, the spray head is connected with pumping device two between the bottom of gas washing jar, pumping device two is high-pressure atomizing pump, the inside of gas washing jar is equipped with screen, the screen is placed with filler, the filler is below the spray head, the gas washing jar is connected with recovery device for recycling cleaning agent for reuse, the inside of gas washing jar is equipped with washing device for cleaning filler.

[0021] When using, waste gas is passed into the inside of gas washing jar along the gas inlet, then valve one is opened, cleaning agent in the material storage box is pumped into the gas washing jar by pumping device one, and the cleaning agent in the gas washing jar is extracted by pumping device two and sprayed from the spray head, according to the principle of similar dissolves similar, atomized cleaning agent enters the filler and forms a liquid film on the filler, volatile compounds in the waste gas are cleaned by contacting the waste gas with the cleaning agent, the cleaned waste gas can be treated in the next step, then the cleaning agent and volatile compounds mixed into the cleaning agent are separated by the recovery device, so that the cleaning agent can be recycled and reused, the use cost is reduced, and the spray head is an atomizing spray head, so that the sprayed cleaning agent is in the form of mist droplets, the mist droplet-shaped cleaning agent enters the filler, which can reduce the thickness of the liquid film, not only increase the contact area of the cleaning agent and the waste gas, but also reduce the resistance of the liquid film to the absorption of the waste gas, effectively improve the cleaning efficiency.

[0022] Preferably, the recycling device comprises a distillation tank, an exhaust port two is arranged above the distillation tank, a valve two is arranged on the exhaust port two, the valve two is an electromagnetic valve, a treatment device is connected to the exhaust port two through a pipe one, the treatment device can be a condenser or a burner or a photoelectric catalyst, a heating layer is arranged on the outer wall of the distillation tank, a water inlet is arranged below the heating layer, a water outlet is arranged above the heating layer, a pipe two is welded and arranged on the water inlet and the water outlet, a water tank is connected to the pipe two, a heating device is arranged in the water tank, the heating device is an electric heating wire, a material pumping device three is connected to the pipe two, the material pumping device three is a centrifugal pump, the water tank is connected to an external water source, a pipe three is connected between the inside of the distillation tank and the bottom of the gas washing tank, a valve four is threadedly connected to the pipe three, the valve four is an electromagnetic valve, and a material transferring assembly is connected to the distillation tank.

[0023] By arranging the distillation tank and using high-boiling-point organic mineral oil as the cleaning agent, when the cleaning agent cleans the exhaust gas to a certain extent, the concentration of volatile compounds in the cleaning agent gradually increases, and the absorption capacity of the cleaning agent gradually decreases; after the cleaning agent in the gas washing tank cleans the exhaust gas for 30-60 minutes, the material transferring assembly is started to transfer the cleaning agent in the gas washing tank into the distillation tank; 10 minutes before the transfer, the heating device is started in advance, and after 5 minutes of heating, the centrifugal pump is started to pump the water in the heating tank into the heating layer to heat the inner wall of the distillation tank, so that the distillation tank is preheated, the separation time is reduced when the cleaning agent enters the distillation tank, the replacement time of the cleaning agent in the gas washing tank is increased, and the cleaning effect of the cleaning agent in the gas washing tank is improved.

[0024] In the application, when volatile organic compounds with high boiling points are treated, the treatment device can be a condenser to recycle and reuse the volatile organic compounds; when volatile organic compounds with low boiling points are treated, if a condenser is used, the condenser needs to be kept at a low temperature, which requires high energy consumption and increases the use cost, and the condenser has low recycling efficiency for volatile organic compounds with low boiling points; for volatile organic compounds with low boiling points, a burner or a photoelectric catalyst can be used; the burner produces harmful gases, such as benzene volatile organic compounds, during use, while the photoelectric catalyst can catalyze most volatile organic compounds to produce harmless gases, which is more environmentally friendly, but the use cost and the cost of the equipment are higher.

[0025] In the present application, the distillation tank is heated by water bath heating, in addition, the distillation tank can also be heated by heating resistance wire, compared with water bath heating, the heating resistance wire can produce higher temperature in use, which can be used for distillation of volatile organic compounds with high boiling point, but the heating resistance wire heating can cause uneven temperature of the inner wall of the distillation tank, and some parts of the inner wall have higher temperature, which can cause the cleaning agent to be easily volatilized.

[0026] Preferably, the material transfer assembly comprises a fourth pipe welded on the bottom of the gas washing tank, a valve five is threadedly connected on the fourth pipe, the valve five is a threaded electromagnetic valve, the third pipe is used for connecting a vacuum device, a mounting bracket two is welded on the inside of the gas washing tank, a mounting pipe is welded on the mounting bracket two, and a liquid level meter is threadedly connected on the mounting pipe.

[0027] When the cleaning agent is distilled and recovered in the distillation tank, the gas in the distillation tank is mainly volatile compounds, most of which have the characteristics of being flammable and explosive, and the concentration of volatile compounds is too large, which is easy to explode after mixing with oxygen. By using the vacuum material extraction method, the gas in the gas washing tank can be prevented from entering the distillation tank, and the liquid level meter is arranged in the gas washing tank, which can retain part of the cleaning agent in the gas washing tank during the material transfer process. Thus, it can prevent air from entering the distillation tank due to excessive vacuum material transfer, and the gas washing tank can still work during the material transfer process.

[0028] Preferably, a cooling layer is arranged above the distillation tank.

[0029] During use, a small amount of cleaning agent with high boiling point can still be evaporated after heating. By arranging a cooling layer above the distillation tank, normal temperature water or cold water can be introduced into the cooling layer. The evaporated cleaning agent will be instantaneously liquefied and flow back into the distillation tank after contacting the cooling layer, thereby avoiding the waste of this part of the cooling liquid.

[0030] The cleaning agent with relatively low boiling point can be circulated by introducing cold water, and the cleaning agent with high boiling point can be directly introduced into normal temperature water. The water needs to be refrigerated when introduced into cold water, thereby increasing energy consumption, but the cooling effect will be better.

[0031] Preferably, a plurality of heat conducting plates are arranged inside the distillation tank, a plurality of spray pipes are arranged inside the distillation tank, the outlet direction of the spray pipes faces the inner wall of the distillation tank, the outlet of the spray pipe is flat, and the spray pipe is connected with the third pipe.

[0032] By setting multiple spray pipes inside the distillation tank, and the outlet direction of the spray pipes is towards the inner wall of the distillation tank, so that the cleaning agent discharged from the spray pipes can directly and uniformly contact the inner wall of the distillation tank, the heat absorption efficiency of the cleaning agent is improved, the distillation time is reduced, and the energy consumption is reduced.

[0033] Preferably, the exhaust port is provided with a demisting filter screen, and the demisting filter screen is a wire mesh demister.

[0034] The gas passing through the gas washing tank is directly discharged into the air, and the cleaning agent discharged from the spray head is in mist form and is easy to drift into the air, causing secondary pollution. By setting the demisting filter screen, the gas cleaned by the cleaning agent can be directly discharged to the outside air through the demisting filter screen, and the mist cleaning agent in the gas is adsorbed by the demisting filter screen and eventually condenses into water droplets and falls back into the gas washing tank, thereby avoiding the drift of the atomized cleaning agent into the air and causing secondary pollution.

[0035] Preferably, the distillation tank is provided with a grounding wire connected to the floor.

[0036] By setting the grounding wire on the distillation tank, the grounding wire is connected to the floor, which can avoid static electricity generated during use of the equipment, prevent static electricity, avoid equipment failure, and prevent external air from entering the distillation tank, causing the mixture of volatile organic compounds with high internal concentration and air to ignite, thereby improving the safety of the equipment.

[0037] Preferably, the washing device comprises two mounting plates welded and mounted inside the gas washing tank, a rotating shaft rotatably mounted on the two mounting plates through bearings, two fixed plates fixedly mounted on the inner wall of the gas washing tank, the two fixed plates being arranged below the screen and above the spray head, respectively, the two fixed plates being located between the two mounting plates, a plurality of arc-shaped openings being formed in the two fixed plates, two movable plates being provided on the rotating shaft, an arc-shaped baffle being provided on each movable plate and having the same number of arc-shaped openings as the movable plate, the area of the arc-shaped baffle being greater than that of the arc-shaped opening, a connector being provided on the movable plate and used to connect the movable plate and the rotating shaft, a liquid inlet and a liquid outlet being provided on the side wall of the gas washing tank between the two fixed plates, a driving device being connected to the rotating shaft and driven in a gear transmission manner, the power source being a three-phase motor, and a limiting block being welded on the fixed plate and used to limit the rotation angle of the movable plate.

[0038] When in use, due to the high viscosity of the mineral oil and the dust and sticky impurities in the exhaust gas, the dust and the sticky impurities are easy to adhere to the surface of the filler, so that the cleaning frequency of the filler is increased, and due to the high viscosity of the mineral oil, the commonly used spray washing method cannot well clean the filler, and when the filler is blocked, the filler needs to be taken out for cleaning, and when the filler is replaced, the worker needs to climb the gas washing tank to take out the filler, which is not only complex, but also has certain safety hazards in high-altitude operation, in the application, the movable plate and the fixed plate are arranged, in use, the driving device drives the rotating shaft to rotate, the connector connects the movable plate and the rotating shaft, the rotating shaft drives the movable plate to rotate, the arc-shaped baffle completely blocks the arc-shaped opening, and the closed space is formed between the two fixed plates, the liquid inlet is used to introduce the detergent, the liquid outlet is closed when the detergent is introduced, the detergent stays between the two fixed plates to soak the filler, and the liquid outlet is opened to discharge the detergent after soaking, the liquid inlet is used to introduce the detergent to flush the filler during the discharge of the detergent, so that the filler in the spray tower can be better cleaned without taking out the filler manually, and unnecessary trouble is reduced.

[0039] Preferably, a stirring paddle for stirring the filler is welded on the rotating shaft.

[0040] The stirring paddle is arranged to stir the filler, so that the mutual friction between the fillers is generated, the sticky impurities on the fillers are more easily removed, the cleaning effect is improved, and the cleaning speed is effectively improved.

[0041] Preferably, a plurality of small holes are formed in the stirring paddle, and the diameters of the small holes are 0.5cm-1cm smaller than the diameter of the filler.

[0042] The plurality of small holes are arranged on the stirring paddle to avoid affecting the flow of the detergent in the filler and affecting the effect of treating the exhaust gas.

[0043] The connector comprises a sliding groove formed in the movable plate, the sliding groove is communicated with the compressed gas tank, a convex block is slidably installed in the sliding groove, the convex block is conical, a pressure relief valve is connected to the sliding groove, and a groove matched with the convex block is arranged on the rotating shaft.

[0044] In use, the sliding groove is communicated with the vacuum tank, the convex block is matched with the groove, the rotating shaft drives the movable plate to rotate, the arc-shaped baffle blocks the arc-shaped opening, when the movable plate contacts with the limiting block, the rotating shaft extrudes the convex block, the pressure in the sliding groove is increased, and when the pressure in the sliding groove is increased to a certain degree, the gas is discharged from the pressure relief valve, and then the sliding groove is disconnected with the compressed gas tank through the valve, the rotating shaft can drive the movable plate and the stirring paddle to rotate through the connector, the power device is reduced, and the manufacturing cost of the equipment is reduced.

[0045] Compared with the prior art, the application has the beneficial effects that:

[0046] 1、The method and device for treating waste gas by using high-boiling point mineral oil, by using high-boiling point organic mineral oil to clean industrial waste gas, and by using an atomizing nozzle to atomize the cleaning agent to reduce the liquid film resistance on the filler, and by using a recycling device to recycle the cleaning agent for reuse, the volatile organic compounds are treated specifically, the cleaning agent is recycled and reused, and the use cost of the equipment is obviously reduced.

[0047] 2、The method and device for treating waste gas by using high-boiling point mineral oil, by using a vacuum material transfer mode, and by arranging a liquid level meter in the gas washing tank, the gas in the gas washing tank can be prevented from entering the distillation tank during the material transfer process, the high-concentration volatile organic compounds in the distillation tank are prevented from contacting air to generate an explosive hazard, and the use safety of the equipment is improved.

[0048] 3、The method and device for treating waste gas by using high-boiling point mineral oil, by arranging movable plates and fixed plates, a closed space is formed between the two fixed plates after the movable plates and the fixed plates are matched, the filler can be directly cleaned in the gas washing tank by immersing the filler in the cleaning agent, the filler does not need to be manually taken out, unnecessary trouble is reduced, the danger of manual high-altitude operation is avoided, the filler is stirred by arranging stirring paddles, the filler is rubbed with each other, the sticky impurities on the filler are more easily removed, the cleaning effect is improved, and the cleaning speed is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 It is a schematic view of the overall structure of the application;

[0050] Figure 2 It is a rear view of the overall structure of the application;

[0051] Figure 3 It is a front view of the overall structure of the application;

[0052] Figure 4 It is a side view of the gas washing tank of the application;

[0053] Figure 5 It is a sectional view of the distillation tank in Example Two of the application;

[0054] Figure 6 It is a sectional view of the distillation tank in Example One of the application;

[0055] Figure 7 It is a Figure 4 partial enlarged view of A in the application;

[0056] Figure 8This is a top sectional view of the gas washing tank of the present invention;

[0057] Figure 9 For the present invention Figure 4 Enlarged view of section B in the middle.

[0058] In the diagram: 1. Air scrubbing tank; 2. Air inlet; 3. Exhaust port 1; 4. Storage tank; 5. Material extraction device 1; 6. Valve 1; 7. Nozzle; 8. Material extraction device 2; 9. Distillation tank; 10. Exhaust port 2; 11. Pipe 1; 12. Valve 2; 13. Pipe 2; 14. Water tank; 15. Valve 3; 16. Pipe 3; 17. Valve 4; 18. Level gauge; 19. Cooling layer; 20. Heat-conducting plate; 21. Spray nozzle; 22. Demisting filter; 23. Grounding wire; 24. Material extraction device 3; 25. 1. Material extraction device four; 26. Valve five; 27. Processing device; 28. Pipe four; 29. ​​Mounting bracket one; 30. Screen; 31. Packing; 32. Mounting plate; 33. Rotating shaft; 34. Fixed plate; 35. Movable plate; 36. Connector; 361. Slide groove; 362. Protrusion; 363. Pressure relief valve; 364. Groove; 37. Liquid inlet; 38. Liquid outlet; 39. Drive device; 40. Limiting block; 41. Agitator; 42. Small hole; 43. Mounting bracket two; 44. Mounting pipe. Detailed Implementation

[0059] Example 1, as Figures 1 to 9 As shown, this embodiment is used to treat industrial waste gas containing toluene, which has a boiling point of 110.6°C, as detailed below:

[0060] An apparatus for treating waste gas using high-boiling-point mineral oil includes a gas scrubbing tank 1, with an air inlet 2 at the bottom and an exhaust outlet 3 at the top. Inside the gas scrubbing tank 1 is a cleaning device for targeted treatment of volatile organic compounds in industrial waste gas. The cleaning device includes a storage tank 4 for storing a cleaning agent, which is a high-boiling-point organic mineral oil, specifically No. 7 white oil with a boiling point of 300°C. A material extraction device 5, a rotor pump, is connected between the storage tank 4 and the gas scrubbing tank 1 for transferring the cleaning agent. A valve 6, a solenoid ball valve, is located between the material extraction device 5 and the gas scrubbing tank 1. A mounting bracket 29 is welded and installed on the gas scrubbing tank 1. Multiple nozzles 7 are installed above the gas washing tank 1. Each nozzle 7 is an atomizing nozzle. A material extraction device 8, which is a high-pressure atomizing pump, connects the nozzles 7 to the bottom of the gas washing tank 1. A screen 30 is installed inside the gas washing tank 1, on which packing material 31 is placed. The packing material 31 is located below the nozzles 7. A washing device for cleaning the packing material 31 is installed inside the gas washing tank 1. A recovery device for recovering the cleaning agent is connected to the gas washing tank 1. The recovery device includes a distillation tank 9. An exhaust port 10 is welded and installed above the distillation tank 9. A valve 12, a threaded electromagnetic ball valve, is threaded onto the exhaust port 10. A processing device 27, which is a condenser, is installed at the exhaust port 10. The condenser is a prior art device used for recovering volatile organic compounds. The condenser recovery device has a condenser power of 18KW. A heating layer is provided on the outer wall of the distillation tank 9, and a heating resistor is wound inside the heating layer. The transfer assembly includes a pipe 16 connected to the bottom of the gas washing tank 1, with a valve 17 (threaded electromagnetic ball valve) on the pipe 16. A pipe 28 is welded to the top of the distillation tank 9, with a valve 26 (electromagnetic ball valve) on the pipe 28. The pipe 28 is used to connect to a vacuum device, which is a vacuum tank connected to a vacuum pump. A mounting bracket 43 is welded to the inner wall of the gas washing tank 1, with a mounting pipe 44 welded to the mounting bracket 43. A level gauge 18 is threaded onto the mounting pipe 44. Multiple heat-conducting plates 20 are provided inside the distillation tank 9. Multiple nozzles 21 are provided, with their outlets facing the inner wall of the distillation tank 9. The nozzles 21 have flat outlets and are connected to pipe 16. A demisting filter 22, a wire mesh demister, is provided at the exhaust port 3. A grounding wire 23 connected to the floor is provided below the distillation tank 9. The washing device includes two mounting plates 32 welded inside the gas washing tank 1. A rotating shaft 33 is rotatably mounted on the two mounting plates 32 via bearings. Two fixed plates 34 are fixedly installed on the inner wall of the gas washing tank 1, respectively positioned below the screen 30 and above the nozzle 7, between the two mounting plates 32. Multiple arc-shaped openings are provided on each fixed plate 34. Two movable plates 35 are provided on the rotating shaft 33.The movable plate 35 is provided with arc-shaped baffles equal in number to the arc-shaped openings of the movable plate 35, and the area of the arc-shaped baffles is greater than that of the arc-shaped openings. The movable plate 35 is provided with a connector 36 for connecting the movable plate 35 with the rotating shaft 33. The sidewall of the gas washing tank 1 between the two fixed plates 34 is provided with a liquid inlet 37 and a liquid outlet 38. The rotating shaft 33 is connected with a driving device 39 which is driven in a gear transmission mode, and the power source is a three-phase motor. The fixed plate 34 is welded with a limiting block 40 for limiting the rotating angle of the movable plate 35. The rotating shaft 33 is welded with a stirring paddle 41 for stirring the filler 31. The stirring paddle 41 is spiral-shaped, and a plurality of small holes 42 are formed in the stirring paddle 41. The diameter of the small holes 42 is 0.5-1 cm smaller than that of the filler 31, and preferably 0.5 cm smaller than that of the filler 31, so as to improve the flowability of the detergent when the filler 31 is cleaned. The connector 36 comprises a sliding groove 361 formed in the movable plate 35, and a convex block 362 is slidingly installed in the sliding groove 361. The convex block 362 is tapered. The sliding groove 361 is connected with a pressure relief valve 363. The rotating shaft 33 is provided with a groove 364 matched with the convex block 362.

[0061] Before work, 1000L of cleaning agent is added to the storage box 4, and whether the inside of the vacuum tank reaches the set value is checked. Whether the water in the water tank 14 is sufficient is checked. The temperature inside the condenser is adjusted to 10℃. After the adjustment is completed, the valve 6 and the material extraction device 5 are opened. 600L of cleaning agent in the storage box 4 is transferred into the gas washing tank 1 through the material extraction device 5, and the preparation work is completed.

[0062] During work, the waste gas is introduced into the gas washing tank 1, and the material extraction device 8 is opened at the same time. The cleaning agent in the gas washing tank 1 is extracted by the material extraction device 8 and sprayed along the spray head 7. The spray head 7 is an atomizing spray head. The cleaning agent is atomized after being extracted by the material extraction device and passing through the spray head 7, so as to increase the washing area with the waste gas and improve the washing effect. The volatile organic compounds in the waste gas after being washed by the cleaning agent are dissolved in the cleaning agent. After the waste gas is treated, it can be directly discharged from the exhaust port 3. The mist-shaped cleaning agent flowing with the gas is condensed into water at the demisting filter screen 22 and finally falls back into the gas washing tank 1, so as to avoid the mist-shaped cleaning agent being discharged into the external air with the gas to cause secondary pollution.

[0063] When the exhaust gas is washed for 30 minutes, the heating resistor is powered on, and the distillation tank 9 is preheated. After heating for 5 minutes, the valve five 26 is opened to connect the distillation tank 9 with the vacuum device, and at the same time, the valve four 17 is opened. Under the suction of the vacuum, the cleaning agent in the gas washing tank 1 is sprayed from the nozzle 21 along the pipe three 16, and the outlet of the nozzle 21 faces the inner wall of the gas washing tank 1. The cleaning agent flows down along the inner wall of the distillation tank 9 and the heat conducting plate 20, improving the heating efficiency of the cleaning agent and reducing energy consumption. When the liquid level meter 18 detects that the liquid level in the gas washing tank 1 reaches 20 cm, the material extraction device two 8 stops working, the material extraction device one 5 starts working and the valve one 6 is opened, and the cleaning agent in the storage tank 4 is extracted into the gas washing tank 1. The cleaning agent heated in the distillation tank 9 evaporates by absorbing heat, enters the condenser along the exhaust pipe two 13, and is recycled for reuse. After distillation of the cleaning agent for 30 minutes, the material extraction device four 25 starts working to transfer the cleaning agent in the distillation tank 9 to the storage tank 4 for next use. In this way, the organic compounds in the exhaust gas are treated.

[0064] When the exhaust gas stops discharging, the material extraction device two 8 is closed to stop washing the exhaust gas, and whether the equipment completely stops running is checked. After checking that all facilities of the equipment stop working, the cleaning of the exhaust gas is completed.

[0065] After three months of use, the packing 31 can be cleaned. During operation, the drive device 39 rotates the shaft 33, connecting the slide 361 to the compressed air tank. This causes the protrusion 362 to engage with the groove 364, rotating the shaft 33 and rotating the movable plate 35. This causes the arc-shaped baffle to completely block the arc-shaped opening, creating a sealed space between the two fixed plates 34. When the movable plate 35 contacts the limiting block 40, the shaft 33 presses against the protrusion 362, increasing the internal pressure of the slide 361. Once the internal pressure reaches a certain level, gas is discharged from the pressure relief valve 363. After the arc-shaped baffle and arc-shaped opening are completely closed, detergent is introduced through the inlet 37. The outlet 38 is closed during detergent introduction, allowing the detergent to remain between the two fixed plates 34 to soak the packing 31. During the soaking process, the valve disconnects the slide 361 from the compressed air tank, and the drive device 39 continues to work, driving the agitator 41 to stir the packing 31. After soaking for 30 minutes, the outlet 38 is opened to discharge the detergent. During the detergent discharge process, the inlet 37 discharges detergent to rinse the packing 31. After rinsing for 5 minutes, clean water is introduced to remove the detergent from the packing 31. After rinsing for 5 minutes, the cleaning of the packing 31 is completed. Then, the valve controls the slide 361 to connect with the vacuum tank and controls the drive device 39 to reverse. When the protrusion 362 and the groove 364 are engaged, the rotating shaft 33 drives the movable plate 35 to reverse, thereby causing the arc-shaped baffle to be misaligned with the arc-shaped opening. Finally, the drive device 39 is closed, and the slide 361 is disconnected from the compressed air tank, thus completing the cleaning of the packing 31.

[0066] Example 2, as Figures 1 to 9 As shown, this embodiment is used to treat industrial waste gas containing allyl chloride, which has a boiling point of 46°C, as detailed below:

[0067] In Example 2, a catalytic burner is connected to the exhaust port 2 10 via pipe 1 11. The distillation tank 9 is equipped with a cooling layer 19. The distillation tank 9 is heated by a water bath. The distillation tank 9 is equipped with a heating layer. A water inlet is located below the heating layer, and a water outlet is located above the heating layer. Pipe 2 13 connects the water inlet and the water outlet. A water tank 14 is connected to pipe 2 13. A heating device, which is an electric heating wire, is installed inside the water tank 14. A material extraction device 3 24, which is a centrifugal pump, is connected to pipe 2 13. The water tank 14 is connected to an external water source.

[0068] After 30 minutes of exhaust gas cleaning, the heating device is activated to heat the water inside the water tank 14. After 5 minutes of heating, the centrifugal pump is activated to pump the water in the water tank 14 to the inlet. Then the water flows back into the water tank 14 from the outlet. The water bath heats the inner wall of the distillation tank 9, and the gas is then treated by the catalytic burner.

[0069] In the second embodiment, the distillation tank 9 is heated by water bath heating. The heating temperature of water bath heating is only suitable for the distillation of volatile organic compounds with low boiling points. However, the heating temperature of water bath heating is relatively uniform, and the local high temperature caused by the heating resistance wire can be avoided, so that the high-boiling-point organic mineral oil can be prevented from being volatilized. In the second embodiment, the cooling layer 19 is arranged above the distillation tank 9, so that the high-boiling-point organic mineral oil volatilized can be cooled and recovered. In the second embodiment, the treatment device 27 is a catalytic combustor. The catalytic combustor can catalytically combust the allyl chloride to generate harmless gas which is directly discharged. Compared with the first embodiment, the volatile organic compounds cannot be recovered, but the cleaning efficiency is high, and the environment is not secondarily polluted.

[0070] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A device for treating exhaust gas with high-boiling mineral oil, comprising a gas washing tank (1), a gas inlet (2) is arranged below the gas washing tank (1), and a gas outlet (3) is arranged above the gas washing tank (1), characterized in that: The gas washing tank (1) is internally provided with a cleaning device and a washing device, the cleaning device is used for targeted treatment of volatile organic compounds in industrial waste gas by high-boiling-point mineral oil; The gas washing tank (1) is internally provided with a screen (30), the screen (30) is placed with a filler (31); the washing device comprises two mounting plates (32) arranged above the spray head (7) and below the screen (30), the mounting plates (32) are mounted on the inner wall of the gas washing tank (1), the two mounting plates (32) are jointly and rotatably mounted with a rotating shaft (33), two fixed plates (34) are fixedly mounted on the inner wall of the gas washing tank (1), the two fixed plates (34) are arranged below the screen (30) and above the spray head (7) respectively, the two fixed plates (34) are located between the two mounting plates (32) respectively, a plurality of arc-shaped openings are formed in the two fixed plates (34) respectively, the rotating shaft (33) is provided with two movable plates (35) which are separately matched with the two fixed plates (34), the movable plates (35) are provided with connectors (36), the connectors (36) are used for connecting the movable plates (35) and the rotating shaft (33), a liquid inlet (37) and a liquid outlet (38) are arranged on the side wall of the gas washing tank (1) between the two fixed plates (34), the rotating shaft (33) is connected with a driving device (39), the fixed plates (34) are provided with limiting blocks (40) for limiting the rotating angle of the movable plates (35); the rotating shaft (33) is fixedly mounted with a stirring paddle (41) for stirring the filler (31), a plurality of small holes (42) are formed in the stirring paddle (41), the diameters of the small holes (42) are smaller than the diameters of the filler (31) by 0.5cm-1cm.

2. A device for treating exhaust gases with high-boiling mineral oil according to claim 1, characterized in that The cleaning device comprises a storage box (4) for storing cleaning agent, the cleaning agent is high-boiling-point organic mineral oil, the storage box (4) is connected with the gas washing tank (1) through a first material extraction device (5), the first material extraction device (5) and the gas washing tank (1) are provided with a valve (6), the gas washing tank (1) is provided with a mounting frame (29), a plurality of spray heads (7) are arranged above the mounting frame (29), the spray heads (7) are atomizing spray heads, the spray heads (7) are connected with the bottom of the gas washing tank (1) through a second material extraction device (8), the filler (31) is arranged below the spray heads (7), the gas washing tank (1) is connected with a recovery device for recovering the cleaning agent, the gas washing tank (1) is internally provided with a washing device for washing the filler (31), and a demisting filter screen (22) is arranged at the exhaust port (3).

3. A device for treating exhaust gases with high-boiling mineral oil according to claim 1, characterized in that: The connector (36) comprises a sliding groove (361) formed in the movable plate (35), a protruding block (362) is movably mounted in the sliding groove (361), the protruding block (362) is conical, the sliding groove (361) is connected with a pressure relief valve (363), and the rotating shaft (33) is provided with a groove (364) matched with the protruding block (362).

4. A device for treating exhaust gases with high-boiling mineral oil according to claim 2, characterized in that: The recovery device comprises a distillation tank (9), an exhaust port two (10) is arranged above the distillation tank (9), a treatment device (27) is connected to the exhaust port two (10) through a pipe one (11), a valve two (12) is arranged on the pipe one (11), a heating layer is arranged on the outer wall of the distillation tank (9), a water inlet is arranged below the heating layer, a water outlet is arranged above the heating layer, a pipe two (13) is connected between the water inlet and the water outlet, a water tank (14) is connected to the pipe two (13), a material extraction device three (24) is connected to the pipe two (13), a heating device is arranged in the water tank (14), the water tank (14) is connected with an external water source, a material transfer assembly is connected to the distillation tank (9), the distillation tank (9) and the material storage tank (4) are connected with a material extraction device four (25), and a valve three (15) is arranged at the connection position of the distillation tank (9) and the material storage tank (4).

5. A device for treating exhaust gases with high-boiling mineral oil according to claim 4, characterized in that: The material transfer assembly comprises a pipe three (16) connected to the bottom of the gas washing tank (1), a valve four (17) is arranged on the pipe three (16), a pipe four (28) is arranged above the distillation tank (9), the pipe four (28) is used for connecting a vacuum device, a valve five (26) is arranged on the pipe four (28), a mounting bracket two (43) is arranged on the inner wall of the gas washing tank (1), a mounting pipe (44) is arranged below the mounting bracket two (43), a liquid level meter (18) is mounted on the mounting pipe (44), and a grounding wire (23) is arranged below the distillation tank (9) and connected with a floor.

6. A device for treating exhaust gases with high-boiling mineral oil according to claim 4, characterized in that: A cooling layer (19) is arranged above the distillation tank (9).

7. A device for treating exhaust gases with high-boiling mineral oil according to claim 4, characterized in that: A plurality of heat-conducting plates (20) are arranged in the distillation tank (9), a plurality of spray pipes (21) are arranged in the distillation tank (9), the outlet direction of the spray pipes (21) is towards the inner wall of the distillation tank (9), the outlet of the spray pipes (21) is flat, and the spray pipes (21) are connected with the pipe three (16).

8. A method for treating exhaust gas with high-boiling mineral oil, suitable for use in the apparatus for treating exhaust gas with high-boiling mineral oil according to any one of claims 1 to 7, characterized in that The method comprises the following steps: s1: first, add a cleaning agent into the material storage tank (4), start the vacuum device, and open the valve one (6) and the material extraction device one (5); s2: introduce waste gas and open the material extraction device two (8); s3: start the heating device to heat the water in the water tank (14); s4: start the material extraction device three (24) to make the water in the water tank (14) enter the heating layer to preheat the distillation tank (9); s5: open the valve four (17) and the valve five (26), and transfer the cleaning agent in the gas washing tank (1) to the distillation tank (9) through vacuum adsorption; s6: when the liquid level detected by the liquid level meter (18) reaches a specified height, the valve four (17) and the valve five (26) are closed, the valve two (12) is opened to make the distillation tank (9) communicate with the treatment device (27), and the material extraction device one (5) is started again; s7: heat to a specified time, stop the material extraction device three (24), start the valve three (15) and the material extraction device four (25); s8: stop the valve three (15) and the material extraction device four (25). s9: the device uses to the prescribed time, start driving device (39) drive shaft (33) positive rotation, control connector (36) and compressed gas tank connection, connection time is 10 s, to the inside of the liquid inlet (37) into the detergent, the filler (31) is soaked; s10: the filler (31) is soaked for 10-20 minutes, open the liquid outlet (38), and the liquid inlet (37) into the detergent to flush the filler (31), the flushing time is 3-6 minutes, and then flush the filler (31) with water, the flushing time is 3-6 minutes; s11: control driving device (39) reverse, control connector (36) and compressed gas tank connection, connection time is 10 s, 15 s after stop driving device (39) operation.

Images