Paint spraying waste gas purification device and treatment method thereof

Abstract

The invention discloses a paint spraying waste gas purification device and a treatment method thereof. The purification device comprises a waste gas collection device, a powder spraying device, a Venturi tube, a cyclone separation device, a filter cartridge filtering device and a VOCs purification device. According to the device, through the tangential entering characteristic of the cyclone separation device, the Venturi tube is fully utilized to accelerate the wind speed of waste gas at the inlet of the cyclone separation device, so that the viscous paint mist is efficiently collided and contacted with the cylinder wall, the viscous paint mist is efficiently separated, a large number of paint mist separation and filtration materials are omitted, and a large number of dangerous wastes are avoided; the treatment cost is greatly reduced; meanwhile, through the design of the inner wall of the cyclone separation device and the combination of the powder spraying device and the heating device, paint mist adhering to the cylinder wall of the cyclone separation device can be separated, cleaning can be conducted without shutdown, lasting and effective operation of equipment can be kept, and after efficient paint mist separation, subsequent gaseous pollutant purification becomes more efficient and reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas treatment, and more particularly to a paint spraying waste gas purification device and a treatment method thereof. BACKGROUND

[0002] Volatile organic compounds (VOCs) are key precursors of PM2.5 and ozone formation, which are physiologically toxic and have a huge impact on the environment and human health. Industrial production is a key area of VOCs emission, among which VOCs emitted during the paint spraying process are particularly serious. The paint spraying process includes three steps: spraying, leveling, and drying, each of which releases VOCs. Due to the addition of organic solvents in paint coatings, there is organic chemical waste gas emission, mainly containing organic chemical pollutants such as benzene, toluene, and xylene; in addition to organic waste gas, due to the atomization of paint or varnish under high pressure, a part of paint particles that do not reach the surface of the painted object diffuse with the gas flow to form paint mist, so the paint spraying waste gas also contains paint mist particles. Paint mist particles are very small, most of which are below 10 μm, and have high viscosity, easily adhering to the surface of the material.

[0003] Current paint mist treatment processes mainly include wet separation method and dry filtration method. The wet separation method uses water spraying, water film, and absorption method to capture the process, and its principle is to capture the paint mist with water to separate the paint mist in the paint spraying waste gas. The main problem of the wet separation method is the generation of waste water, which needs to be treated; in addition, the separated paint mist is easy to adhere and block the equipment, and the treated waste gas has high humidity, which affects the subsequent treatment of paint spraying waste gas. The dry filtration method mainly uses the screening effect of the filter material to filter the paint mist in the waste gas, so as to separate the paint mist. Compared with the wet purification technology, the dry filtration method does not produce waste water, the equipment is relatively simple, and the energy consumption is low, so it is considered to be an economic and efficient method for separating paint mist. The core problem of the dry filtration method is that the paint mist adheres and blocks the filter material, which causes the equipment to stop running, and the filter material needs to be replaced frequently. The discarded filter material must be treated as hazardous waste, and the cost of manual maintenance, filter material replacement, and hazardous waste treatment is high. Developing an efficient paint spraying waste gas purification device to solve the problem of low-cost purification of paint mist separation is the technical problem to be solved by the present application.

[0004] The application CN202110047041.6 discloses a combined modular high-efficiency waste gas purification all-in-one machine, comprising a pretreatment module, an adsorption and concentration module and a power and catalytic combustion module; the pretreatment module comprises a flow guide chamber, a powder spraying chamber and a filter chamber, a side wall of the flow guide chamber is provided with an air inlet, a rear end of the air inlet is provided with a baffle, a top of the powder spraying chamber is provided with a powder sprayer, and a filter cartridge is installed in the filter chamber; an adsorption layer is arranged in the adsorption and concentration module; the power and catalytic combustion module comprises an adsorption fan, a heat exchanger, a catalytic combustion device and a desorption fan, and an adsorption and desorption and catalytic combustion integrated unit is formed between the adsorption and concentration module, the adsorption fan, the heat exchanger, the catalytic combustion device and the desorption fan; the application blows off the paint mist by spraying powder and then by pulse back blowing for processing, but the powder spraying operation cannot completely wrap and cover the paint mist particles, and part of the paint mist particles may be adhered to the device, which may even block the filter cartridge during long-term operation, so that the equipment cannot continuously operate. SUMMARY

[0005] To solve the above technical problems, especially aiming at the problems of high frequency and cost of replacing filter material of the existing paint mist purification device, and adhesion and blockage of the equipment leading to continuous operation of the equipment, the application provides a paint spraying waste gas purification device and a processing method thereof.

[0006] The object of the application is achieved by the following technical scheme. A paint spraying waste gas purification device comprises a waste gas collecting device, a powder spraying device, a Venturi tube, a cyclone separation device, a filter cartridge filtering device and a VOCs purification device; one end of the waste gas collecting device is provided with a pipeline for collecting waste gas, and the other end is connected with one end of the Venturi tube through a pipeline; the nozzle of the powder spraying device is arranged in the pipeline between the waste gas collecting device and the Venturi tube; the cyclone separation device comprises a cylindrical body, an air inlet arranged on the side surface of the cylindrical body, an exhaust port arranged at the upper part in the cylindrical body, a conical body connected with the cylindrical body and an ash cylinder arranged below the conical body; the cylindrical body is provided with a heating device, and the inner wall surface of the cylindrical body is provided with continuous protrusions or pits; the air inlet pipe of the cyclone separation device is connected with one end of the Venturi tube, and the air outlet pipe of the cyclone separation device is connected with the inlet of the filter cartridge filtering device; the filter cartridge filtering device comprises an inlet, a pulse back blowing device, a filter cartridge and an outlet; the filter cartridge is arranged in a box body, an ash collecting cylinder is arranged below the box body, and a hopper is connected with the lower end of the ash collecting cylinder; a plurality of filter cartridges are arranged, and the pulse back blowing device is in communication with the filter cartridges; and the outlet is connected with the VOCs purification device.

[0007] Further, the pit is in the shape of a hemisphere, and the radius of the hemisphere is 1-5 mm.

[0008] Further, the protrusion is in the shape of a hemisphere, and the radius of the hemisphere is 1-5 mm.

[0009] Further, the direction of the spray head is opposite to the flow direction of the processing gas.

[0010] Further, the powder sprayed by the powder spraying device is dry lime powder or talc powder, and the particle size of the powder is 15-45 mu m.

[0011] Further, a valve is further arranged between the cone and the ash cylinder.

[0012] Further, the material of the cylinder is selected from one of stainless steel, SPCC and Q235.

[0013] A treatment method of a paint spraying exhaust gas purification device, comprising the following operation steps: S1, connecting the exhaust gas collecting device to the exhaust gas source, guiding the exhaust gas into the paint spraying exhaust gas purification device, and tangentially entering the cyclone separation device after being accelerated by the Venturi; S2, when the paint spraying exhaust gas purification device runs for 4-8 hours, the paint mist adhered to the cylinder wall is separated: first, the heating device is started to heat and keep the cylinder warm; then the powder spraying device is started, and the powder is sprayed into the pipeline through the spray head; S3, after the exhaust gas is discharged from the exhaust pipe of the cyclone separation device, it enters the filter cartridge filter device for deep filtration of dust in the exhaust gas, and the pulse backflusher is set periodically to backflush and remove dust from the filter cartridge regularly; S4, after the exhaust gas is filtered by the filter cartridge filter device, it is discharged from the outlet of the filter cartridge filter device and enters the subsequent VOCs purification device for purification treatment of gaseous pollutants.

[0014] Further, the ratio of the purification time to the separation operation time is 4-8:1.

[0015] Further, the heating temperature in step S2 is greater than or equal to 100 DEG C.

[0016] Compared with the prior art, the beneficial effects of the present application are: 1. The spraying exhaust gas is removed by quality classification and step-by-step, first the viscous paint mist is efficiently separated, then the non-viscous dust is filtered, and then the VOCs are purified, realizing the whole process of collaborative purification.

[0017] 2. By the tangential entry feature of the cyclone separation device, the exhaust gas wind speed at the inlet of the cyclone separation device is accelerated by the Venturi tube, realizing efficient collision and contact of viscous paint mist with the cylinder wall, and the viscous paint mist can be combined with the cylinder wall at high frequency and high momentum, thereby realizing efficient separation of viscous paint mist. Compared with the traditional paint mist separation technology, a large amount of paint mist separation and filtration materials are saved, a large amount of hazardous waste is avoided, and the treatment cost is greatly reduced.

[0018] 3. Through the design of the inner wall of the cyclone separation device, the combination of the powder spraying device and the heating device can realize efficient adhesion of viscous paint mist and separation of the paint mist adhered to the cylinder wall of the cyclone separation device, without the need of stopping for cleaning, so that the device can be kept in effective and durable operation. After efficient separation of the paint mist, the subsequent purification of gaseous pollutants becomes more efficient and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Figure 1 is a schematic diagram of the device structure of the present application; Figure 2 Figure 2 is a schematic diagram of the radial section of the cyclone separation device of the present application; Figure 3 Figure 3 is a schematic diagram of the cylinder wall structure in Example 1 of the present application; Figure 4 Figure 4 is a schematic diagram of the cylinder wall structure in Example 2 of the present application; Wherein: 1, waste gas collecting device; 2, spray head; 3, powder spraying device; 4, Venturi tube; 5, air inlet pipe; 6, exhaust pipe outlet; 7, exhaust pipe; 8, heating device; 9, cyclone separation device; 10, cylindrical body; 11, cylinder wall; 12, exhaust pipe inlet; 13, conical body; 14, valve; 15, ash cylinder; 16, inlet; 17, filter cartridge filter device; 18, pulse backflusher; 19, outlet; 20, filter cartridge; 21, ash hopper; 22, ash collecting cylinder; 23, pit; 24, protrusion. DETAILED DESCRIPTION

[0020] In order to clearly illustrate the technical solutions of the present application, the following will give a detailed description of the present application with reference to the drawings. In the following description, numerous specific details will be set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without these specific details. In other instances, well-known methods have not been described in detail in order to avoid obscuring the present application. In addition, in the description of the present application, the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the drawings shown, and are merely used for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", etc. are used only for the purpose of description and should not be understood as indicating or implying relative importance or implying a specified number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited. In the present application, unless otherwise specifically defined and limited, the terms "mount", "connect", "connect", "fix", and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0021] Embodiment 1 Please refer to Figures 1 to 4The embodiment provides a paint spraying waste gas purification device, which comprises a waste gas collecting device 1, a powder spraying device 3, a Venturi tube 4, a cyclone separation device 9, a filter cartridge filtering device 17 and a VOCs purification device; one end of the waste gas collecting device 1 is provided with a pipeline for collecting waste gas, and the other end is connected with one end of the Venturi tube 4 through a pipeline; the nozzle 2 of the powder spraying device 3 is arranged in the pipeline between the waste gas collecting device 1 and the Venturi tube 4; the cyclone separation device 9 comprises a cylindrical body 10, an air inlet arranged on the side surface of the cylindrical body 10, an exhaust port arranged in the upper part of the cylindrical body 10, a conical body 13 connected with the cylindrical body 10 and an ash cylinder 15 arranged below the conical body 13; the cylindrical body 10 is provided with a heating device 8, and a continuous pit 23 is arranged on the inner wall surface of the cylindrical body 10; the air inlet pipe 5 of the cyclone separation device 9 is connected with one end of the Venturi tube 4, and the exhaust pipe outlet 6 of the cyclone separation device 9 is connected with the inlet 16 of the filter cartridge filtering device 17; the filter cartridge filtering device 17 comprises the inlet 16, a pulse backflusher 18, a filter cartridge 20 and an outlet 19; the filter cartridge 20 is arranged in a box body, the ash cylinder 15 is arranged below the box body, and the ash hopper 21 is connected with the lower end of the ash cylinder 15; a plurality of filter cartridges 20 are arranged, the pulse backflusher 18 is in communication with the filter cartridges 20; and the outlet 19 is connected with the VOCs purification device.

[0022] 400m3 / h waste gas with an inlet dust concentration of 491mg / m3 is sent into the Venturi tube 4 through a pipeline; the device changes the airflow from thick to thin to accelerate the gas flow rate, so that a “vacuum” area is formed at the rear side of the outlet of the Venturi tube 4; under the jet flow induction acceleration of the Venturi tube 4, the waste gas enters the cyclone separation device 9 tangentially; under the action of centrifugal force, the paint mist in the waste gas is thrown to the inner wall of the cylindrical body 10 of the cyclone separation device 9, and the viscous paint mist is adhered to the inner wall of the cylindrical body 10; the waste gas from which the viscous paint mist is removed rotates downward in the cyclone separation device 9 under the action of centrifugal force, then rotates upward, enters the exhaust pipe inlet 12 of the cyclone separation device 9 and is discharged from the exhaust pipe outlet 6, then enters the filter cartridge filtering device 17 and is discharged from the outlet, and then enters the subsequent VOCs purification device for purification treatment of gaseous pollutants.

[0023] When the paint spray exhaust device runs for 6 hours, the inner wall of the cylinder 10 will accumulate and adhere to the paint mist, at this time, the heating device 8 outside the cyclone separation device cylinder 10 is started, the cylinder 10 is continuously heated, the temperature of the cylinder wall 11 is controlled to be above 120℃, and the temperature is continuously maintained, the paint mist adhered to the surface of the cylinder 10 is dehydrated by heating, the adhesion of the paint mist layer on the cylinder wall 11 is reduced, and the paint mist layer and the cylinder wall 11 are partially separated; the powder spraying device 3 is started again, the powder is sprayed by the nozzle 2 in the direction opposite to the exhaust gas flow direction, so that the powder and the paint mist in the exhaust gas are fully mixed, the powder sprayed by the powder spraying device 3 is dry lime powder or talc powder, the particle size of the powder is 15-45μm, the paint mist in the exhaust gas is combined with the lime powder or talc powder to become large particle non-sticky dust, the scouring effect on the paint mist layer after heating is increased under the action of the tangential centrifugal force, the paint mist layer on the cylinder wall 11 is peeled off, and the self-cleaning purpose is achieved, the paint mist adhered to the cylinder wall 11 is scoured and falls down into the conical body 13 below the cyclone separation device 9, the valve 14 below the conical body 13 is opened regularly, and the separated paint mist is collected in the ash cylinder 15.

[0024] The exhaust gas with the sticky paint mist is discharged through the exhaust pipe of the cyclone separation device 9, enters the filter cylinder filtering device 17, and is deeply filtered for non-sticky dust in the exhaust gas, the dust concentration is 0.85mg / m3 through the outlet dust concentration test of the filter cylinder filtering device 17, after a period of filtration, the pulse blower 18 of the filter cylinder filtering device 17 is started, the filter cylinder 20 is backblown, so that the dust deposited on the surface of the filter cylinder 20 can be cleaned into the ash bucket 21 in time. The exhaust gas is discharged from the outlet of the filter cylinder filtering device 17 after deep filtration, enters the subsequent VOCs purification device for purification treatment of gaseous pollutants, wherein the VOCs purification device is prior art, which will not be described in detail here.

[0025] Specifically, please refer to Figure 3 The concave pit 23 is in the shape of a hemisphere, the radius of the hemisphere is 1-5mm, the sticky paint mist in the concave pit 23 is first dehydrated when heated, the paint mist layer in the concave pit 23 is dehydrated and expanded by heating and separated from the inner wall of the concave pit 23, the paint mist layer on the cylinder wall 11 is deformed and shrinks, the paint mist layer in the local area is thinned, and compared with the paint mist layer on the flat cylinder wall 11, the paint mist layer is easy to be scoured and peeled off by the tangentially entering non-sticky dust.

[0026] After the paint mist layer is scoured and falls off, the powder spraying device 3 and the heating device 8 are closed, the sticky paint mist in the exhaust gas entering the cyclone separation device 9 is adhered to the cylinder wall 11 of the cyclone separation device 9, and a new cycle of sticky paint mist enrichment process is started, after a period of time, the powder spraying device 3 and the heating device 8 are started again to separate the paint mist on the cylinder wall 11.

[0027] Example 2 Please refer toFigures 1 to 4 The embodiment provides a paint spraying exhaust gas purification device, which comprises an exhaust gas collecting device 1, a powder spraying device 3, a Venturi tube 4, a cyclone separation device 9, a filter cartridge filtering device 17 and a VOCs purification device; one end of the exhaust gas collecting device 1 is provided with a pipeline for collecting exhaust gas, and the other end is connected with one end of the Venturi tube 4 through a pipeline; the nozzle 2 of the powder spraying device 3 is arranged in the pipeline between the exhaust gas collecting device 1 and the Venturi tube 4; the cyclone separation device 9 comprises a cylindrical body 10, an air inlet arranged on the side surface of the cylindrical body 10, an exhaust port arranged at the upper part in the cylindrical body 10, a conical body 13 connected with the cylindrical body 10 and an ash cylinder 15 arranged below the conical body 13; the cylindrical body 10 is provided with a heating device 8, and a continuous protrusion 24 is arranged on the inner wall surface of the cylindrical body 10; the air inlet pipe 5 of the cyclone separation device 9 is connected with one end of the Venturi tube 4, and the exhaust pipe outlet 6 of the cyclone separation device 9 is connected with the inlet 16 of the filter cartridge filtering device 17; the filter cartridge filtering device 17 comprises the inlet 16, a pulse backflusher 18, a filter cartridge 20 and an outlet 19; the filter cartridge 20 is arranged in a box body, the ash cylinder 15 is arranged below the box body, and a dust hopper 21 is connected with the lower end of the ash cylinder 15; a plurality of filter cartridges 20 are arranged, the pulse backflusher 18 is in communication with the filter cartridges 20; and the outlet 19 is connected with the VOCs purification device.

[0028] 400m 3 / h exhaust gas with an inlet dust concentration of 476mg / m 3 is sent into the Venturi tube 4 through a pipeline; the device changes the airflow from thick to thin to accelerate the gas flow rate, so that a “vacuum” area is formed at the rear side of the outlet of the Venturi tube 4; under the jet flow induction acceleration of the Venturi tube 4, the exhaust gas enters the cyclone separation device 9 tangentially, under the action of centrifugal force, the paint mist in the exhaust gas is thrown to the inner wall of the cylindrical body 10 of the cyclone separation device 9, and the viscous paint mist is adhered to the inner wall of the cylindrical body 10; the exhaust gas from which the viscous paint mist is removed rotates downward in the cyclone separation device 9 under the action of centrifugal force, then rotates upward, enters the exhaust pipe inlet 12 of the cyclone separation device 9 and is discharged from the exhaust pipe outlet 6, then enters the filter cartridge filtering device 17 and is discharged from the outlet, and then enters the subsequent VOCs purification device for purification treatment of gaseous pollutants.

[0029] When the paint spray exhaust device runs for 6 hours, the inner wall of the cylinder 10 will accumulate and adhere to the paint mist, at this time, the heating device 8 outside the cyclone separation device cylinder 10 is started, the cylinder 10 is continuously heated, the temperature of the cylinder wall 11 is controlled to be above 100℃, and the temperature is continuously maintained, the paint mist adhered to the surface of the cylinder 10 is dehydrated by heating, the adhesion of the paint mist layer on the cylinder wall 11 is reduced, and the paint mist layer and the cylinder wall 11 are partially separated; the powder spraying device 3 is started again, the powder is sprayed by the nozzle 2 in the direction opposite to the exhaust gas flow direction, so that the powder and the paint mist in the exhaust gas are fully mixed, the powder sprayed by the powder spraying device 3 is dry lime powder or talc powder, the particle size of the powder is 15-45μm, the paint mist in the exhaust gas is combined with the lime powder or talc powder to become large particle non-sticky dust, the scouring effect on the paint mist layer after heating is increased under the action of the tangential centrifugal force, the paint mist layer on the cylinder wall 11 is peeled off, and the self-cleaning purpose is achieved, the paint mist adhered to the cylinder wall 11 is scoured and falls down to the conical body 13 below the cyclone separation device 9, the valve 14 below the conical body 13 is opened regularly, and the separated paint mist is collected in the ash cylinder 15.

[0030] The exhaust gas with the sticky paint mist is discharged through the exhaust pipe of the cyclone separation device 9, enters the filter cylinder filtering device 17, and is deeply filtered. 3 After a period of filtration, the pulse blower 18 of the filter cylinder filtering device 17 is started, the filter cylinder 20 is backblown, so that the dust deposited on the surface of the filter cylinder 20 can be cleaned into the ash bucket 21 in time. The exhaust gas is discharged from the outlet of the filter cylinder filtering device 17 after deep filtration, enters the subsequent VOCs purification device for purification treatment of gaseous pollutants, wherein the VOCs purification device is prior art, which is not described in detail here.

[0031] Further, please refer to Figure 4 The protrusion 24 is in the shape of a hemisphere, the radius of the hemisphere is 1-5mm, and relatively more liquid-solid paint mist is deposited at the connection in the middle of the protrusion 24. When the paint mist layer is heated, the paint mist is first dehydrated and then deformed. The paint mist layer deposited at the connection in the middle of the protrusion 24 shrinks after dehydration, so that the paint mist layer is easy to separate from the connection. The paint mist layer on the surface of the protrusion 24 becomes thin under the stretching action, and is easy to be scoured and peeled off by the non-sticky dust entering tangentially, compared with the paint mist layer on the flat cylinder wall.

[0032] After the paint mist layer is scoured and falls off, the powder spraying device 3 and the heating device 8 are closed, the sticky paint mist in the exhaust gas entering the cyclone separation device 9 is adhered to the cylinder wall 11 of the cyclone separation device 9, and a new cycle of sticky paint mist enrichment process is started. After a period of time, the powder spraying device 3 and the heating device 8 are started again to separate the paint mist on the cylinder wall 11.

[0033] Embodiment 3 The embodiment provides a treatment method of a paint spraying waste gas purification device, which is used for the paint spraying waste gas purification device and comprises the following operation steps. S1, connecting the waste gas collecting device to a waste gas source, guiding the waste gas into the paint spraying waste gas purification device, and tangentially entering the cyclone separation device after being accelerated by a Venturi; S2, when the paint spraying waste gas purification device is operated for 4-8 hours, performing a separation operation on the paint mist adhered to the cylinder wall: first, starting the heating device to heat and keep warm the cylinder body; and then starting the powder spraying device to spray the powder into the pipeline through the spray head; S3, after the waste gas is discharged from the exhaust pipe of the cyclone separation device, the waste gas enters the filter cylinder filtering device to perform deep filtration on the dust in the waste gas, and the period of the pulse backflusher is set to regularly backflush and remove dust from the filter cylinder; S4, after the waste gas is filtered by the filter cylinder filtering device, the waste gas is discharged from the outlet of the filter cylinder filtering device and enters the subsequent VOCs purification device to perform purification treatment on the gaseous pollutants.

[0034] The time ratio of the purification time to the separation operation time is 4-8:1, and the ratio can be small when the content of the paint mist in the waste gas is large.

[0035] The heating temperature in the step S2 is greater than or equal to 100 DEG C, so that the paint mist adhered to the waste is heated to lose moisture and soften, and the adhesion is reduced.

[0036] Obviously, the above embodiment of the present application is only an example for clearly illustrating the present application, and is not a limitation on the implementation manner of the present application. Based on the above description, any other different forms of changes or variations can be made by those skilled in the art. Here, all the implementation manners are not enumerated, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A paint overspray purification apparatus, characterized by, The device comprises a waste gas collecting device, a powder spraying device, a Venturi tube, a cyclone separation device, a filter cartridge filtering device and a VOCs purifying device. One end of the waste gas collecting device is provided with a pipeline for collecting waste gas, and the other end is connected with one end of the Venturi tube through a pipeline. The cyclone separation device comprises a cylindrical body, an air inlet arranged on the side surface of the cylindrical body, an exhaust port arranged at the upper part of the cylindrical body, a conical body connected with the cylindrical body, and an ash cylinder arranged below the conical body. The filter cartridge filtering device comprises an inlet, a pulse backflusher, a filter cartridge, and an outlet.

2. A paint spray exhaust purification device according to claim 1, wherein The filter cartridge is arranged in a box body, and an ash collecting cylinder is arranged below the box body.

3. A paint spray exhaust purification apparatus according to claim 1, wherein The filter cartridge is provided with a plurality of pulse backflushers.

4. The paint spray exhaust purifier of claim 1 wherein, The outlet is connected with the VOCs purifying device.

5. The paint spray exhaust purifier of claim 1 wherein, The recess is in the shape of a hemisphere, and the radius of the hemisphere is 1-5 mm.

6. A paint spray exhaust purification apparatus according to claim 1, wherein The protrusion is in the shape of a hemisphere, and the radius of the hemisphere is 1-5 mm.

7. The paint spray exhaust purifier of claim 1 wherein, The direction of the spray head is opposite to the flow direction of the processing gas.

8. A treatment method for a paint spray exhaust gas purification device, for use in a paint spray exhaust gas purification device as claimed in any one of claims 1 to 7, characterized by, The powder sprayed by the powder spraying device is dry lime powder or talc powder, and the particle size of the powder is 15-45 μm. A valve is further arranged between the conical body and the ash cylinder. The material of the cylindrical body is selected from one of stainless steel, SPCC and Q235. The device comprises the following operation steps: S1, connecting the waste gas collecting device to a waste gas source, guiding the waste gas into the paint spraying waste gas purifying device, and tangentially entering the cyclone separation device after being accelerated by the Venturi tube; 9. A method of treating a paint spray exhaust according to claim 8, wherein, S2, when the paint spraying waste gas purifying device is operated for 4-8 hours, the paint mist adhered to the cylinder wall is separated: first, the heating device is started to heat and keep warm the cylindrical body; then, the powder spraying device is started, and powder is sprayed into the pipeline through the spray head; 10. The method of claim 8, wherein the paint spray exhaust purification apparatus is a device for purifying exhaust gas from a paint spray booth. S3, after the waste gas is discharged from the exhaust pipe of the cyclone separation device, the waste gas is filtered by the filter cartridge filtering device, and the pulse backflusher is set to periodically backflush and remove dust from the filter cartridge; S4, after the waste gas is filtered by the filter cartridge filtering device, the waste gas is discharged from the outlet of the filter cartridge filtering device and enters the subsequent VOCs purifying device for purification treatment of gaseous pollutants. The ratio of the purification time to the separation operation time is 4-8:

1. The heating temperature in step S2 is greater than or equal to 100℃.

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