Gas purification system for treating waste gas based on waste engine oil and use method of gas purification system

Abstract

The invention belongs to the field of waste gas treatment, and particularly relates to a gas purification system for treating waste gas based on waste engine oil, which comprises a primary filter, an engine oil spray tower, an oil-gas separator, an activated carbon filter and an electrocatalytic oxidation reactor which are connected in sequence, the engine oil spray tower comprises a spray chamber, a filler cylinder is arranged below the spray chamber, and an oil collecting tank is arranged below the filler cylinder; the oil collecting tank is connected with the circulating oil tank, an oil outlet of the oil-gas separator is connected with the circulating oil tank through an oil return pipe, an air outlet of the oil-gas separator is connected with a main air pipe of the activated carbon filter, and a desorption device is arranged on one side of the activated carbon filter. Through cooperative work of all the components, multiple filtration is formed for waste gas generated in the coating industry, the purification effect on the waste gas is effectively guaranteed, a treatment mode of treating waste with waste is adopted, the operation and maintenance cost of the system is greatly reduced, and the system further has the advantages of being convenient and fast to install, convenient to operate and control and the like.

Description

Technical Field

[0001] The present invention belongs to the field of waste gas treatment, and in particular relates to a waste gas purification system for treating waste gas based on waste engine oil and a use method thereof. Background Art

[0002] When coating companies are coating products, they are impacted by the spray airflow and will produce a large amount of volatile organic waste gas, namely VOCs. The source of this waste gas is the waste gas generated by the oiling machine box during the painting work and the waste gas generated by the oven. The main components of the waste gas are: particulate matter, methyl methacrylate, butyl methacrylate, butyl acrylate, butyl acetate, non-methane total hydrocarbons, etc. The volatile organic waste gas synthesized by these pollutants is retained, suspended and diffused in the working space during operation, causing serious air pollution, posing great hidden dangers to fire safety and production safety. In addition, this harsh environment also seriously affects the normal use of instruments and equipment, restricts the improvement of product quality in the coating industry, and even endangers the physical and mental health of employees.

[0003] At present, the purification equipment used in the coating industry mainly includes the following categories: regenerative incineration and regenerative catalytic combustion. These two processes are relatively mature and effective treatment methods, but they are not suitable for the treatment of intermittent exhaust gas or have high one-time investment costs; direct use of activated carbon process adsorption for purification, this type of adsorption process is suitable for small enterprises with intermittent production, and can only have some effect on micro-equipment and mild volatile organic compounds, and cannot meet the needs of continuous and large-scale production; a purification device integrating water curtain cleaning and activated carbon adsorption is used. The water curtain cleaning used in this process requires the addition of chemicals to the water, and the generated wastewater must also be purified. Due to the effect of water vapor, the moisture content of the exhaust gas sent to the activated carbon adsorption device is very high, and the activated carbon adsorption is very easy to be saturated and fail. The activated carbon needs to be replaced in time, resulting in a high maintenance cost of the purification device, and the above purification equipment cannot achieve a better purification effect on the exhaust gas generated by the coating industry. Summary of the invention

[0004] In view of the above problems, the present invention provides a gas purification system for treating exhaust gas based on waste engine oil and a method for using the same.

[0005] A gas purification system for treating waste gas based on waste oil, comprising a primary filter, a machine oil spray tower, an oil-gas separator, an activated carbon filter, and an electrocatalytic oxidation reactor connected in sequence; The primary filter comprises a primary filter chamber, the upper and lower parts of which are connected to an air inlet pipe and an air outlet pipe respectively, the width of which gradually increases from the upper and lower ends to the middle, and a polymer filter felt and a polymer adsorption plate arranged in upper and lower arrangement are provided on the inner side of the middle part of the primary filter chamber; The engine oil spray tower comprises a spray chamber, an air outlet is provided at the top of the spray chamber, a filling cylinder is provided at the bottom of the spray chamber, the filling cylinder is filled with granular fillers, an inclined guide plate is provided in the spray chamber near the filling cylinder, a spray pipe is provided above the guide plate, a plurality of nozzles arranged evenly are provided on the spray pipe, an oil collecting box is provided below the filling cylinder, an air inlet for connecting to the air outlet pipe is provided on the side wall of the oil collecting box, the oil collecting box is connected to a circulating oil tank, and the circulating oil tank is connected to the spray pipe through a pump body; The air outlet of the spray chamber is connected to the air inlet of the oil-gas separator, the oil outlet of the oil-gas separator is connected to the circulating oil tank through an oil return pipe, and the air outlet of the oil-gas separator is connected to the main air duct of the activated carbon filter; The activated carbon filter comprises two filter chambers arranged in parallel, the upper part of the filter chamber is connected to the main air duct, an inlet valve is provided at the connection between the main air duct and the filter chamber, the lower part of the filter chamber is connected to the exhaust pipe, an outlet valve is provided at the connection between the exhaust pipe and the filter chamber, and a desorption device is provided on one side of the activated carbon filter; The exhaust pipe is connected to the electrocatalytic oxidation reactor.

[0006] Furthermore, it also includes an electrical control box, and the pump body, the inlet valve, the outlet valve, the desorption device, and the electrocatalytic oxidation reactor are all electrically connected to the electrical control box.

[0007] Furthermore, the primary filter includes a support frame, a working platform is provided on the support frame, the primary filter chamber is arranged on the middle side of the working platform, a winding device is provided on the working platform, the winding device includes a driving shaft and a passive shaft respectively arranged on both sides of the primary filter chamber, the driving shaft is connected to a driving motor through a reducer, and strip openings for passing the polymer filter felt are provided on both side walls of the primary filter chamber, and two symmetrically arranged guide plates are provided at the strip openings, and the cross-section of the guide plates is arc-shaped and is located on the outside of the primary filter chamber, and then one end of the polymer filter felt is fixed on the passive shaft, and the other end of the polymer filter felt is fixed on the driving shaft, and the outer sides of the driving shaft and the passive shaft are provided with outer cover shells.

[0008] Furthermore, a differential pressure transmitter is installed in the air inlet duct, a photoelectric sensor switch is installed on the working platform, and the differential pressure transmitter, the photoelectric sensor switch and the driving motor are all electrically connected to the electrical control box.

[0009] Furthermore, there are four guide plates in the spray chamber, and the four guide plates surround a guide channel that is wide at the top and narrow at the bottom; An overflow pipe is provided above the diversion channel, and the overflow pipe is connected to the circulating oil tank.

[0010] Furthermore, a liquid level sensor is provided in the circulating oil tank, and a flow rate sensor is provided in the spray pipe. Both the liquid level sensor and the flow rate sensor are electrically connected to the electrical control box.

[0011] Further, the desorption device includes a fan connected to a steam inlet pipe, the fan is connected to a main steam pipe, the main steam pipe is connected to the upper part of the filter bin, and a steam valve is provided at the connection between the main steam pipe and the filter bin, the lower part of the filter bin is also connected to a condensate pipe, the connection between the condensate pipe and the filter bin is provided with a water outlet valve, the condensate pipe is connected to a condenser, and the condenser is connected to a sewage pipe; The fan, the steam valve and the water outlet valve are all electrically connected to the electrical control box.

[0012] A method for using a gas purification system for treating waste gas based on waste oil comprises the following steps: Step 1: Primary filtration: the exhaust gas enters the primary filter chamber from the air inlet pipe of the primary filter, and is intercepted by the polymer filter felt and polymer adsorption plate, and then sent out from the air outlet pipe; Step 2: Spray filtration. The exhaust gas sent out from the air outlet pipe enters from the air inlet on the side wall of the oil collecting tank at the bottom of the oil spray tower, passes through the packing cylinder and the spray chamber from bottom to top, and then is sent out from the air outlet at the top of the spray chamber. Waste oil is stored in the circulating oil tank of the oil spray tower. The waste oil is sent into the spray pipe through the pump body and sprayed out from the nozzle located in the spray chamber. The waste oil sprayed from the nozzle is sprayed downward on the guide plate and gathered into a liquid curtain under the action of the guide plate. It flows into the filling cylinder from top to bottom. With the help of the granular filler in the filling cylinder, the waste oil is fully mixed with the exhaust gas and absorbs small particles in the exhaust gas. It flows into the oil collecting tank under the action of gravity and enters the circulating oil tank again. Step 3: Oil-gas separation: the exhaust gas sent out from the air outlet of the spray room enters the oil-gas separator for oil-gas separation, and the oil mist droplets in the exhaust gas are removed. The oil droplets flowing out of the oil-gas separator are sent to the circulating oil tank through the oil return pipe; Step 4: Activated carbon filtration: the waste gas after oil and gas separation in the oil and gas separator is sent into the filter chamber through the main air duct of the activated carbon filter through the inlet valve, and the impurities in the waste gas are adsorbed by the activated carbon in the filter chamber, and then sent out from the exhaust pipe after passing through the outlet valve at the bottom of the filter chamber; Step 5: Electrocatalytic oxidation: the exhaust gas sent out through the exhaust pipe enters the electrocatalytic oxidation reactor to remove organic pollutants in the exhaust gas, and the purified exhaust gas is discharged.

[0013] Furthermore, in step one, the electrical control box controls the operation of the driving motor on the working platform, and the driving motor drives the driving shaft to rotate through the reducer, so that the polymer filter felt wrapped on the passive shaft passes through the primary filter chamber and transfers to the driving shaft, thereby replacing the polymer filter felt located in the primary filter chamber.

[0014] Furthermore, in the step four, when the desorption operation is performed on a filter chamber in the activated carbon filter through the desorption device, the electrical control box controls the inlet valve and the outlet valve on the top of the filter chamber to close, and opens the steam valve and the water outlet valve, and the high-temperature steam in the steam inlet pipe is driven by the fan to enter the filter chamber from the steam valve. The water flow formed after the high-temperature steam is condensed passes through the water outlet valve and is sent to the condenser through the condensate pipe, and then discharged through the sewage pipe.

[0015] The beneficial effects of the present invention are: (1) Through the cooperation of the primary filter, oil spray tower, activated carbon filter, electrocatalytic oxidation reactor and other components, a multiple filtration purification method is formed, which can effectively target the waste gas generated by the coating industry and achieve a better purification effect; (2) Easy installation. The air purification system has reasonable configuration of various components and compact design, which makes it convenient to install the air purification system close to the spraying equipment or coating drying box, thereby improving the air quality in the working space and reducing pollution; (3) Low maintenance cost. Based on the principle of like dissolves like, waste oil can be used to absorb small particles in the exhaust gas, achieving the environmental protection effect of treating waste with waste. The system is also designed with components such as circulating oil tank and desorption device to ensure the durability and repeated use of the system. (4) Easy to operate. The air purification system can be automatically controlled through the electrical control box, reducing manual monitoring and effectively reducing the labor burden of operators.

[0016] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A partial structural schematic diagram of the present invention is shown; Figure 2 A schematic top view of a part of the structure of the present invention is shown; Figure 3 A partial structural perspective view of a primary filter of the present invention is shown; Figure 4 A side view of the primary filter of the present invention is shown; Figure 5 A schematic diagram of the oil spray tower of the present invention is shown; Figure 6 A cross-sectional view of the oil spray tower of the present invention is shown; Figure 7 A schematic diagram of an activated carbon filter of the present invention is shown; Figure 8 A side view of an activated carbon filter according to the present invention is shown.

[0019] In the figure: 1. primary filter; 101. air inlet pipe; 102. primary filter chamber; 103. air outlet pipe; 104. polymer filter felt; 105. polymer adsorption plate; 106. support frame; 107. working platform; 108. active shaft; 109. passive shaft; 110. guide plate; 111. drive motor; 112. reducer; 113. differential pressure transmitter; 114. photoelectric induction switch; 2. oil spray tower; 201. spray chamber; 202. oil collecting tank; 203. air inlet; 204. circulating oil tank; 205. Pump body; 206. Spray pipe; 207. Overflow pipe; 208. Nozzle; 209. Guide plate; 210. Filling cylinder; 3. Oil-gas separator; 4. Activated carbon filter; 401. Main air duct; 402. Filter bin; 403. Exhaust duct; 404. Main steam pipe; 405. Condensate pipe; 406. Condenser; 407. Activated carbon filler; 408. Second grid plate; 409. Filler loading and unloading inspection door; 410. Fan; 5. Electrocatalytic oxidation reactor; 6. Centrifugal fan; 7. Electrical control box. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1 like Figure 1-8As shown, a purification system for treating waste gas based on waste oil comprises a primary filter 1, an oil spray tower 2, an oil-gas separator 3, an activated carbon filter 4, and an electrocatalytic oxidation reactor 5 connected in sequence; the primary filter 1 comprises a primary filter chamber 102, the upper and lower parts of the primary filter chamber 102 are respectively connected to an air inlet pipe 101 and an air outlet pipe 103, the width of the primary filter chamber 102 gradually increases from the upper and lower ends to the middle, and the middle inner side of the primary filter chamber 102 is provided with high The oil spray tower 2 includes a spray chamber 201, an air outlet is provided at the top of the spray chamber 201, a packing cylinder 210 is provided below the spray chamber 201, and the packing cylinder 210 is filled with granular packing, and a guide plate 209 is provided in an inclined manner near the packing cylinder 210 in the spray chamber 201, and a spray pipe 206 is provided above the guide plate 209, and a plurality of nozzles 206 are arranged evenly. 8. An oil collecting box 202 is provided below the filling cylinder 210. An air inlet 203 for connecting to the air outlet pipe 103 is provided on the side wall of the oil collecting box 202. The oil collecting box 202 is connected to the circulating oil tank 204. The circulating oil tank 204 is connected to the spray pipe 206 through the pump body 205. The air outlet of the spray chamber 201 is connected to the air inlet of the oil-gas separator 3. The oil outlet of the oil-gas separator 3 is connected to the circulating oil tank 204 through the oil return pipe. The air outlet of the oil-gas separator 3 is connected to the activated carbon filter. The main air duct 401 of the device 4; the activated carbon filter 4 includes two filter chambers 402 arranged in parallel, the upper part of the filter chamber 402 is connected to the main air duct 401, the connection between the main air duct 401 and the filter chamber 402 is provided with an inlet valve, the lower part of the filter chamber 402 is connected to the exhaust pipe 403, the connection between the exhaust pipe 403 and the filter chamber 402 is provided with an outlet valve, and a desorption device is provided on one side of the activated carbon filter 4; the exhaust pipe 403 is connected to the electrocatalytic oxidation reactor 5. The present invention forms multiple filtrations for the waste gas generated by the coating industry through the coordinated work of various components, effectively guarantees the purification effect of the waste gas, and adopts a waste-to-waste treatment method, which greatly reduces the operation and maintenance costs of the system, and the system also has the advantages of convenient installation and convenient operation.

[0022] The air purification system also includes an electrical control box 7, and the pump body 205, the inlet valve, the outlet valve, the desorption device, and the electrocatalytic oxidation reactor 5 are all electrically connected to the electrical control box 7, so that the electrical control box 7 can control the operation of each component.

[0023] In order to ensure the operation effect of the purification system, the exhaust port of the electrocatalytic oxidation reactor 5 is connected to a centrifugal fan 6, which is electrically connected to an electrical control box 7. In addition, a VOC sensor is provided at the air outlet of the centrifugal fan 6, which is electrically connected to the electrical control box 7, and the electrical control box 7 is electrically connected to a wireless signal transmission device, so that the operator can understand the purification effect of the air purification system on the exhaust gas.

[0024] The width of the primary filter chamber 102 of the primary filter 1 gradually increases from the upper and lower ends to the middle, so that the exhaust gas is decelerated after entering the primary filter chamber 102, and can be evenly intercepted by the polymer filter felt 104 and the polymer adsorption plate 105. The polymer filter felt 104 can be made of polyester needle-punched filter felt, and the polymer adsorption plate 105 can be made of polyethylene filter plate, thereby ensuring the interception effect of large particle oil droplets in the exhaust gas.

[0025] Specifically, the primary filter 1 includes a support frame 106, a working platform 107 is provided on the support frame 106, the primary filter chamber 102 is arranged on the middle side of the working platform 107, a winding device is provided on the working platform 107, and the winding device includes a driving shaft 108 and a driven shaft 109 respectively arranged on both sides of the primary filter chamber 102, the driving shaft 108 is connected to the driving motor 111 through a reducer 112, and strip openings for passing the polymer filter felt 104 are provided on both side walls of the primary filter chamber 102, and two strip openings are provided at the strip openings. The guide plate 110 is symmetrically arranged, and its cross section is arc-shaped and is located outside the primary filter chamber 102. One end of the polymer filter felt 104 is fixed on the passive shaft 109, and the other end of the polymer filter felt 104 is fixed on the active shaft 108. The active shaft 108 and the passive shaft 109 are both provided with an outer cover shell on the outside. With this design, the polymer filter felt 104 in the primary filter chamber 102 can be automatically replaced, thereby ensuring the primary filtration effect of the primary filter 1 and reducing the labor intensity of the operator.

[0026] A differential pressure transmitter 113 is installed in the air inlet pipe 101, and a photoelectric induction switch is installed on the working platform 107. The differential pressure transmitter 113, the photoelectric induction switch 114, and the drive motor 111 are all electrically connected to the electrical control box 7, so that the pressure change in the air inlet pipe 101 is detected by the differential pressure transmitter 113, and the detection result is fed back to the electrical control box 7, and the electrical control box controls the operation of the drive motor 111 to realize the automatic replacement of the polymer filter felt 104. In addition, the photoelectric induction switch 114 can detect whether the polymer filter felt 104 exists, so as to remind the operator to replenish and replace the polymer filter felt 104.

[0027] In order to facilitate operators to replenish and replace the polymer filter felt 104, a staircase is provided on one side of the support frame 106, which also facilitates operators to maintain the primary filter 1.

[0028] There are four guide plates 209 in the spray chamber 201, and the four guide plates 209 surround a guide channel that is wide at the top and narrow at the bottom, so as to guide the waste oil sprayed by the nozzle 208 to the filler tube 210 below. The guide channel of this structure can effectively guide the waste oil, so that it can have a better mixing and absorbing effect on the waste gas during the process of splashing or gathering into a liquid curtain. In addition, an overflow pipe 207 is provided above the guide channel, and the overflow pipe 207 is connected to the circulating oil tank 204, so that excess waste oil can be directly sent back to the circulating oil tank 204.

[0029] A liquid level sensor is provided in the circulating oil tank 204, and a flow rate sensor is provided in the spray pipe 206. The liquid level sensor and the flow rate sensor are both electrically connected to the electrical control box 7, so that the amount of waste oil in the circulating oil tank 204 can be detected by the liquid level sensor, and the flow rate of waste oil in the spray pipe 206 can also be detected by the flow rate sensor, so as to understand whether the amount of waste oil is sufficient and whether impurities in the waste oil affect the spraying effect, which is beneficial for operators to replenish or replace waste oil. A filter is provided at the connection between the oil collecting tank 202 and the circulating oil tank 204, so as to further ensure the use effect of the waste oil.

[0030] The first grid plates are provided above and below the packing tube 210 to facilitate fixing the granular packing in the packing tube 210. The granular packing is a spherical granular packing, which is conducive to ensuring the mixing effect of the waste oil and the exhaust gas.

[0031] In order to ensure the use effect of the activated carbon filter 4, a second grid plate 408 is provided in the filter chamber 402, and an activated carbon filler 407 is provided above the second grid plate 408. In addition, the activated carbon filler 407 can be a honeycomb activated carbon filler 407.

[0032] A filler loading and unloading inspection door 409 is also provided on the side wall of the filter bin 402, so that the operator can observe the use status of the activated carbon filler 407 through the filler loading and unloading inspection door 409, and can replace the activated carbon filler 407 through the filler loading and unloading inspection door 409.

[0033] The desorption device includes a fan 410 for connecting to a steam inlet pipe, the fan 410 is connected to a main steam pipe 404, the main steam pipe 404 is connected to the upper part of the filter bin 402, and a steam valve is provided at the connection between the main steam pipe 404 and the filter bin 402, and a condensate pipe 405 is also connected to the lower part of the filter bin 402, and a water outlet valve is provided at the connection between the condensate pipe 405 and the filter bin 402, the condensate pipe 405 is connected to a condenser 406, and the condenser 406 is connected to a sewage pipe; the fan 410, the steam valve, and the water outlet valve are all electrically connected to the electrical control box 7, so that the activated carbon filler 407 in the filter bin 402 is desorbed by the desorption device with the help of high-temperature steam, thereby extending the service life of the activated carbon filler 407 and reducing the operation and maintenance costs of the system.

[0034] To facilitate the outflow of condensed water, the width of the lower portion of the filter chamber 402 gradually decreases from top to bottom, so that a convergent interface is formed at the lower portion of the filter chamber 402 and connected to the condensed water pipe 405 .

[0035] Example 2 like Figure 1-8 As shown, a method for using a purification system for treating waste gas based on waste oil comprises the following steps: step 1, primary filtration, the waste gas enters the primary filter chamber 102 from the air inlet pipe 101 of the primary filter 1, and is intercepted by the polymer filter felt 104 and the polymer adsorption plate 105. The large particles of oil droplets in the waste gas are then sent out from the air outlet pipe 103; step 2, spray filtration, the waste gas sent from the air outlet pipe 103 enters the air inlet 203 on the side wall of the oil collecting tank 202 at the bottom of the oil spray tower 2 The waste oil flows into the filling cylinder 210 and the spray chamber 201 from bottom to top, and then is sent out from the air outlet at the top of the spray chamber 201. The circulating oil tank 204 of the oil spray tower 2 stores waste oil, which is sent into the spray pipe 206 through the pump body 205 and sprayed out from the nozzle 208 located in the spray chamber 201. The waste oil sprayed from the nozzle 208 is sprayed downward on the guide plate 209, and is gathered into a liquid curtain under the action of the guide plate 209, and flows into the filling cylinder 210 from top to bottom. With the help of the granular filler in the filler tube 210, the waste oil is fully mixed with the exhaust gas and absorbs small particles in the exhaust gas, and flows into the oil collecting tank 202 under the action of gravity, and enters the circulating oil tank 204 again; Step 3, oil and gas separation, the exhaust gas sent out from the air outlet of the spray chamber 201 enters the oil and gas separator 3, oil and gas separation is carried out, and the oil mist droplets in the exhaust gas are removed, and the oil droplets flowing out of the oil and gas separator 3 are sent to the circulating oil tank 204 through the return oil pipe; Step 4, activated carbon filtration, the exhaust gas after oil and gas separation by the oil and gas separator 3 is sent to the filter bin 402 through the main air duct 401 of the activated carbon filter 4 through the inlet valve, and the impurities in the exhaust gas are adsorbed by the activated carbon in the filter bin 402, and then sent out from the exhaust pipe 403 after passing through the outlet valve at the bottom of the filter bin 402; Step 5, electrocatalytic oxidation, the exhaust gas sent out through the exhaust pipe 403 enters the electrocatalytic oxidation reactor 5, removes organic pollutants in the exhaust gas, and discharges the purified exhaust gas. This system can be installed near the spraying equipment and the coating drying box. The primary filter 1 intercepts the large oil droplets in the exhaust gas, the oil spray tower 2 absorbs the small particles in the exhaust gas, the oil-gas separator 3 removes the oil mist droplets in the exhaust gas, and the activated carbon filter 4 absorbs various impurities in the exhaust gas. Finally, the electrocatalytic composite reactor further catalytically oxidizes the organic matter in the exhaust gas, so that the exhaust gas is processed by the purification system and discharged as non-toxic and harmless gas, which effectively improves the working environment of the coating industry and avoids environmental pollution.

[0036] In step one, the electrical control box 7 controls the operation of the driving motor 111 on the working platform 107, and the driving motor 111 drives the driving shaft 108 to rotate through the reducer 112, so that the polymer filter felt 104 wound on the passive shaft 109 passes through the primary filter chamber 102 and transfers to the driving shaft 108, and then replaces the polymer filter felt 104 located in the primary filter chamber 102, thereby facilitating the automatic replacement of the polymer filter felt 104 in the primary filter chamber 102, so as to ensure the primary filtration effect of the primary filter 1 and reduce the labor intensity of the operator.

[0037] In step four, when the desorption operation is performed on a filter chamber 402 in the activated carbon filter 4 through the desorption device, the electrical control box 7 controls the inlet valve and the outlet valve on the upper part of the filter chamber 402 to close, and opens the steam valve and the water outlet valve, and drives the high-temperature steam in the steam inlet pipe through the steam valve to enter the filter chamber 402 through the fan 410. The water flow formed by the condensation of the high-temperature steam passes through the water outlet valve and is sent to the condenser 406 through the condensate pipe 405, and then discharged through the sewage pipe, so as to facilitate the alternating operation of the two filter chambers 402 and maintain the continuous operation of the purification system, thereby ensuring the continuous purification of the working environment.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas purification system for treating exhaust gas based on waste oil, characterized in that: It includes a primary filter, an oil spray tower, an oil-gas separator, an activated carbon filter, and an electrocatalytic oxidation reactor connected in sequence; The primary filter comprises a primary filter chamber, the upper and lower parts of which are connected to an air inlet pipe and an air outlet pipe respectively, the width of which gradually increases from the upper and lower ends to the middle, and a polymer filter felt and a polymer adsorption plate arranged in upper and lower arrangement are provided on the inner side of the middle part of the primary filter chamber; The engine oil spray tower comprises a spray chamber, an air outlet is provided at the top of the spray chamber, a filling cylinder is provided at the bottom of the spray chamber, the filling cylinder is filled with granular fillers, an inclined guide plate is provided in the spray chamber near the filling cylinder, a spray pipe is provided above the guide plate, a plurality of nozzles arranged evenly are provided on the spray pipe, an oil collecting box is provided below the filling cylinder, an air inlet for connecting to the air outlet pipe is provided on the side wall of the oil collecting box, the oil collecting box is connected to a circulating oil tank, and the circulating oil tank is connected to the spray pipe through a pump body; The air outlet of the spray chamber is connected to the air inlet of the oil-gas separator, the oil outlet of the oil-gas separator is connected to the circulating oil tank through an oil return pipe, and the air outlet of the oil-gas separator is connected to the main air duct of the activated carbon filter; The activated carbon filter comprises two filter chambers arranged in parallel, the upper part of the filter chamber is connected to the main air duct, an inlet valve is provided at the connection between the main air duct and the filter chamber, the lower part of the filter chamber is connected to the exhaust pipe, an outlet valve is provided at the connection between the exhaust pipe and the filter chamber, and a desorption device is provided on one side of the activated carbon filter; The exhaust pipe is connected to the electrocatalytic oxidation reactor.

2. A waste gas purification system based on waste oil treatment as claimed in claim 1, characterized in that: It also includes an electrical control box, and the pump body, the inlet valve, the outlet valve, the desorption device, and the electrocatalytic oxidation reactor are all electrically connected to the electrical control box.

3. A waste gas purification system based on waste oil treatment as claimed in claim 2, characterized in that: The primary filter includes a support frame, a working platform is provided on the support frame, the primary filter chamber is arranged on the middle side of the working platform, a winding device is provided on the working platform, the winding device includes a driving shaft and a passive shaft respectively arranged on both sides of the primary filter chamber, the driving shaft is connected to a driving motor through a reducer, strip openings for passing the polymer filter felt are provided on both side walls of the primary filter chamber, two symmetrically arranged guide plates are provided at the strip openings, the cross-section of the guide plates is arc-shaped and is located on the outside of the primary filter chamber, and then one end of the polymer filter felt is fixed on the passive shaft, and the other end of the polymer filter felt is fixed on the driving shaft, and outer covers are provided on the outsides of the driving shaft and the passive shaft.

4. A waste gas purification system based on waste oil treatment as claimed in claim 3, characterized in that: A differential pressure transmitter is installed in the air inlet pipe, a photoelectric sensor switch is installed on the working platform, and the differential pressure transmitter, the photoelectric sensor switch and the driving motor are all electrically connected to the electrical control box.

5. The exhaust gas purification system based on waste oil treatment as claimed in claim 1, characterized in that: There are four guide plates in the spray chamber, and the four guide plates surround a guide channel that is wide at the top and narrow at the bottom; An overflow pipe is provided above the diversion channel, and the overflow pipe is connected to the circulating oil tank.

6. A waste gas purification system for treating waste gas based on waste oil as claimed in claim 2, characterized in that: A liquid level sensor is provided in the circulating oil tank, and a flow rate sensor is provided in the spray pipe. Both the liquid level sensor and the flow rate sensor are electrically connected to the electrical control box.

7. The exhaust gas purification system based on waste oil treatment as claimed in claim 2, characterized in that: The desorption device comprises a fan connected to a steam inlet pipe, the fan is connected to a main steam pipe, the main steam pipe is connected to the upper part of the filter bin, and a steam valve is provided at the connection between the main steam pipe and the filter bin, a condensate pipe is also connected to the lower part of the filter bin, a water outlet valve is provided at the connection between the condensate pipe and the filter bin, the condensate pipe is connected to a condenser, and the condenser is connected to a sewage pipe; The fan, the steam valve and the water outlet valve are all electrically connected to the electrical control box.

8. A method for using a gas purification system for treating waste gas based on waste oil according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Primary filtration: the exhaust gas enters the primary filter chamber from the air inlet pipe of the primary filter, and is intercepted by the polymer filter felt and polymer adsorption plate, and then sent out from the air outlet pipe; Step 2: Spray filtration. The exhaust gas sent out from the air outlet pipe enters from the air inlet on the side wall of the oil collecting tank at the bottom of the oil spray tower, passes through the packing cylinder and the spray chamber from bottom to top, and then is sent out from the air outlet at the top of the spray chamber. Waste oil is stored in the circulating oil tank of the oil spray tower. The waste oil is sent into the spray pipe through the pump body and sprayed out from the nozzle located in the spray chamber. The waste oil sprayed from the nozzle is sprayed downward on the guide plate and gathered into a liquid curtain under the action of the guide plate. It flows into the filling cylinder from top to bottom. With the help of the granular filler in the filling cylinder, the waste oil is fully mixed with the exhaust gas and absorbs small particles in the exhaust gas. It flows into the oil collecting tank under the action of gravity and enters the circulating oil tank again. Step 3: Oil-gas separation: the exhaust gas sent out from the air outlet of the spray room enters the oil-gas separator for oil-gas separation, and the oil mist droplets in the exhaust gas are removed. The oil droplets flowing out of the oil-gas separator are sent to the circulating oil tank through the oil return pipe; Step 4: Activated carbon filtration: the waste gas after oil and gas separation in the oil and gas separator is sent into the filter chamber through the main air duct of the activated carbon filter through the inlet valve, and the impurities in the waste gas are adsorbed by the activated carbon in the filter chamber, and then sent out from the exhaust pipe after passing through the outlet valve at the bottom of the filter chamber; Step 5: Electrocatalytic oxidation: the exhaust gas sent out through the exhaust pipe enters the electrocatalytic oxidation reactor to remove organic pollutants in the exhaust gas, and the purified exhaust gas is discharged.

9. The method for using the gas purification system for treating waste gas based on waste oil as claimed in claim 8, characterized in that: In the step one, the electrical control box controls the operation of the driving motor on the working platform, and the driving motor drives the driving shaft to rotate through the reducer, so that the polymer filter felt wound on the passive shaft passes through the primary filter chamber and transfers to the driving shaft, thereby replacing the polymer filter felt located in the primary filter chamber.

10. The method for using the gas purification system for treating waste gas based on waste oil as claimed in claim 8, characterized in that: In the step four, when the desorption operation is performed on a filter chamber in the activated carbon filter through the desorption device, the electrical control box controls the inlet valve and the outlet valve on the top of the filter chamber to close, and opens the steam valve and the water outlet valve. The high-temperature steam in the steam inlet pipe is driven by the fan to enter the filter chamber from the steam valve. The water flow formed after the high-temperature steam is condensed passes through the water outlet valve and is sent to the condenser through the condensate pipe, and then discharged through the sewage pipe.

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