Semi-closed VOCs normal-temperature catalytic treatment device for automobile maintenance workshop

Abstract

The utility model discloses a semi-closed normal-temperature catalytic treatment device for VOCs (volatile organic compounds) in an automobile maintenance workshop. Comprising an air curtain which is arranged at an opening of a semi-closed workshop and is used for preventing waste gas and waste liquid from overflowing, a sprayer for spraying the waste gas and paint mist in the workshop, a water collecting pit for collecting a mixture of paint and spraying water, and a three-phase separator connected with the water collecting pit, the water collecting pit and the three-phase separator are connected through an air guide pipe capable of sucking a mixture of paint and spraying water in the water collecting pit and waste gas in a workshop, the spraying water mixture generated by spraying and residual waste gas are synchronously recycled through the air guide pipe, and primary waste gas separation is achieved at the communicating position of the obtuse-angle air guide pipe and the air inlet pipe; secondary separation of solid waste residues, liquid and waste gas is carried out in the three-phase separator, and purification of complex VOCs mixed with solid and liquid is effectively and continuously achieved.

Description

Technical Field

[0001] The utility model relates to the field of green environmental protection, in particular to the field of VOCs room-temperature catalytic treatment in automobile repair workshops. Background Art

[0002] With the rapid development of the automobile industry, the automobile maintenance industry has also prospered. In the process of automobile maintenance, a large amount of mixed liquid or solid toxic gases, such as VOCs (volatile organic compounds), will be generated during the painting and baking process. VOCs generated by the automobile maintenance industry are an important part of volatile organic pollutants emitted from daily life. They mainly come from the use of paints such as paint mixing, painting, and baking, and their components are toluene, ethyl acetate, butyl esters, n-butanol, styrene, etc.

[0003] This component VOCs is harmful to human health and the environment. Harmful substances such as toluene can enter the human body through the respiratory tract and skin, causing symptoms such as headaches, dizziness, fatigue, nausea, and chest tightness. Long-term exposure may even cause serious diseases such as leukemia and lung cancer. At the same time, VOCs are important precursors to the formation of fine particulate matter (PM2.5) and ozone, causing pollution to the atmospheric environment. Some VOCs also have a strong greenhouse effect, which has a negative impact on global climate change.

[0004] However, the VOCs control work in the automobile repair industry started late and lacked effective technology and reliable control equipment, resulting in the market being flooded with various products of varying quality, making it difficult to effectively and continuously purify complex VOCs in mixed liquids or solids.

[0005] At present, the commonly used VOCs treatment methods in automobile repair shops include integrated water spray or activated carbon adsorption devices in the paint spraying and baking room, but the devices have low treatment efficiency, are prone to secondary pollution, and cannot meet the emission treatment needs of the current automobile repair industry. The main reason is that VOCs usually exist in the form of gas, and their solubility is limited when they are sprayed with water. In addition, the VOCs generated in automobile repair shops will increase their specific gravity after mixing with liquids or solids, and will escape the adsorption and purification of conventional air purification devices.

[0006] Therefore, it is of great significance to develop an efficient and environmentally friendly VOCs treatment process. Utility Model Content

[0007] The utility model overcomes the deficiencies of the above-mentioned technologies and provides a semi-enclosed VOCs room-temperature catalytic treatment device for automobile repair shops which can effectively and continuously purify complex VOCs.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A semi-enclosed VOCs room-temperature catalytic treatment device for an automobile repair shop, comprising an air curtain arranged at an open opening of the semi-enclosed shop to prevent the overflow of waste gas and waste liquid, a sprayer for spraying the waste gas and paint mist in the shop, a sump for collecting a mixture of paint and spray water, a three-phase separator connected to the sump, the sump and the three-phase separator are connected via an air duct that can inhale the paint and spray water mixture in the sump and the waste gas in the shop, the three-phase separator can separate solids, liquids and gases, and is provided with an exhaust port, a liquid discharge port and a slag discharge port;

[0010] It also includes an air inlet pipe arranged at the rear end of the exhaust port, a drying and filtering module, a normal temperature catalytic module, a centrifugal fan, and a return air pipe arranged in sequence at the rear end of the air inlet pipe;

[0011] At least a portion of the air guide duct is in communication with the air inlet duct, and an axial air inlet direction of the air guide duct forms an obtuse angle with an axial air inlet direction of the air inlet duct.

[0012] In some embodiments, the air duct and the air inlet duct are connected through a filter that can block solids and liquids.

[0013] Preferably, the filter is provided with staggered superimposed blades.

[0014] In some embodiments, in order to improve the inhalation effect, the air guide duct is configured as a spiral air guide structure.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] By setting up air curtains at the openings of semi-enclosed workshops, a relatively closed environment is formed in the workshop, and the exhaust gas and paint mist in the workshop are sprayed to improve solubility. At the same time, the spray water mixture and residual exhaust gas generated by the spraying are synchronously recovered through the air duct, and the first exhaust gas separation is achieved at the obtuse angle where the air duct and the air inlet pipe are connected. The solid waste residue, liquid and exhaust gas are separated twice in the three-phase separator, and then the exhaust gas is further filtered and dried, and then purified by catalysis at room temperature, effectively and continuously achieving the purification of complex VOCs mixed with solids and liquids. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the overall schematic diagram of the semi-enclosed VOCs room-temperature catalytic treatment device in the automobile repair workshop in this case.

[0018] Figure 2 This is a schematic diagram of the air duct.

[0019] Figure 3 It is a schematic diagram of the filter in the second embodiment. DETAILED DESCRIPTION

[0020] The following examples further illustrate the features of the present invention and other related features to facilitate understanding by those skilled in the art:

[0021] In the first embodiment, the semi-enclosed VOCs room temperature catalytic treatment device of the automobile repair shop of the utility model is set in the semi-enclosed automobile repair shop. The size of the semi-enclosed automobile repair shop referred to can be preferably a room with an open entrance of 5m*5m*3m, which can be a modification of the original house structure or a light-weight board construction. The description here is mainly for the purpose of explaining the use environment of the VOCs room temperature catalytic treatment device of the utility model.

[0022] Please refer to Figure 1 The semi-enclosed VOCs room temperature catalytic treatment device for automobile repair workshops of the utility model includes an open opening of the semi-enclosed workshop 100 as described above, that is, an air curtain 110 is arranged at the entrance. The air curtain 110 is generally arranged at the top of the entrance, and blows air from top to bottom at the entrance, that is, the open opening to form an air barrier formed by the wind blown by the air curtain 110, which can prevent the exhaust gas and waste liquid from overflowing. A sprinkler 120 is arranged on the top of the workshop to spray the exhaust gas and paint mist in the workshop at regular intervals. A sump 130 is arranged on one side of the workshop to collect the mixture of paint and spray water, which can be arranged at the rear corresponding to the entrance. In this way, by arranging the air curtain 110 at the open opening of the semi-enclosed workshop, a relatively closed environment is formed in the workshop, and the exhaust gas and paint mist in the workshop are sprayed to improve the solubility.

[0023] The semi-enclosed VOCs room temperature catalytic treatment device for automobile repair workshops of the utility model also includes a three-phase separator 200 connected to the sump 130. The sump 130 and the three-phase separator 200 are connected by an air duct 300 that can inhale the paint and spray water mixture in the sump 130 and the exhaust gas in the workshop. The three-phase separator 200 can separate solids, liquids, and gases, and is provided with an exhaust port 210 for discharging the separated exhaust gas, a liquid discharge port 220 for discharging the separated liquid, and a residue discharge port 230 for discharging the separated solid residue. The separated liquid and solid are treated respectively by a liquid collection device and a solid collection device. This case mainly treats the separated exhaust gas, and the treatment of the liquid and solid is not described in detail.

[0024] The waste gas discharged from the exhaust port 210 needs to be purified. The gas processing module includes an air inlet pipe 410 connected to the exhaust port 210. A drying and filtering module 420, a first normal temperature catalytic module 431, a second normal temperature catalytic module 432, a centrifugal fan 440 as an exhaust power source, and a return air duct 450 for the purified air are sequentially arranged at the rear end of the air inlet pipe 410.

[0025] For ease of explanation, the first normal temperature catalytic module 431 and the second normal temperature catalytic module 432 are collectively referred to as the normal temperature catalytic module 430, and the normal temperature catalytic module 430 uses a catalyst to degrade toxic gases. The catalyst can be selected from VOCs catalysts in the automobile repair industry that are loaded with transition metal oxides with high activity, such as MnOx, CoOx, FeOx, and NiO materials, and multiple materials can be composited if necessary. In the catalytic module, the toxic gas contacts the photocatalyst and undergoes a catalytic reaction to generate harmless or low-toxic products. Specifically, the drying and filtering module 420 filters impurities and moisture in the exhaust gas to prevent the catalyst of the normal temperature catalysis at the rear end from being poisoned.

[0026] The gas after catalytic treatment can be selected to enter the workshop for recirculation through the return air duct 450, or be discharged to the outside to ensure that the air quality in the workshop meets environmental protection standards. The specific implementation method is to set a check valve 451 at the connection between the return air duct 450 and the semi-enclosed workshop 100. At the same time, a conversion valve 452 is set at the front end of the return air duct 450 and the check valve 451, and outdoor discharge or indoor circulation can be selected. In actual application, when the paint spraying operation is performed, the conversion valve 452 can be opened to discharge the air in the return air duct 450 to the outside. When the conversion valve 452 is opened, the check valve 451 is locked to the normally closed state to prevent the air in the return air duct 450 from entering the workshop. In this way, the return air can be prevented from affecting the air pressure of the paint spraying operation environment and affecting the paint spraying effect. When the workshop air environment is conventionally purified, the conversion valve 452 can be closed to allow the air in the workshop to be internally circulated and purified. Of course, when there is a need for ventilation, the conversion valve 452 can also be opened for ventilation. It can be selected independently according to the needs, and this case does not make specific restrictions on this.

[0027] Please refer to Figure 1 and Figure 2 The main invention of this case is that at least a part of the air duct 300 is connected to the air inlet duct 410, and the axial air inlet direction of the air duct 300 forms an obtuse angle with the axial air inlet direction of the air inlet duct. Specifically, the air duct 300 forms a conical air guide structure through a plurality of air guide blades 310, so that the wide diameter of the cone faces the semi-enclosed workshop 100, and at the same time one end sinks into the sump 130, so that the pure exhaust gas directly enters the gas treatment module through the air inlet duct 410, while the wastewater and solid-liquid mixture with a larger specific gravity flow into the three-phase separator 200 below. Preferably, the surface of the connection between the air guide blades 310 is a rough surface, which can destroy the surface tension of the liquid when it flows in the air duct 300, so that the liquid flows more smoothly.

[0028] In this way, the spray water mixture produced by paint and spraying and the residual waste gas are simultaneously recovered through the air duct 300, and the first waste gas separation is realized at the obtuse angle where the air duct 300 and the air inlet pipe 410 are connected. The solid waste residue, liquid and waste gas are secondary separated in the three-phase separator 200. After that, the waste gas is further filtered and dried, and then purified by catalysis at room temperature, thereby effectively and continuously achieving the purification of complex VOCs mixed with solids and liquids.

[0029] In order to improve the inhalation effect, in some embodiments, the air duct 300 is configured to be spiral so that the air flow in the air duct 300 forms a vortex, thereby improving the inhalation effect.

[0030] Embodiment 2: When describing Embodiment 2, the description of the same parts as Embodiment 1 is omitted. As described in Embodiment 1, the solid, liquid, and waste gas mixture entering through the air duct 300 of the utility model will pass through the air inlet duct 410 after passing through the air duct 300. At this time, it is inevitable that waste liquid or solid will be blown in with the waste gas, especially when the amount of solid or liquid is large, the probability is higher. In this regard, this case provides an optimization solution, where the air duct 300 and the air inlet duct 410 are connected through a filter 500 that can block solids and liquids.

[0031] Please refer to Figure 3 Specifically, the filter 500 can be a filtering device composed of mutually offset and superimposed blades. When the centrifugal fan 440 is working, it drives the filter 500 to rotate, and the exhaust gas can pass through the offset and superimposed blades. For solids and liquids, the mutually offset and superimposed blades 510 rotate to form a seamless baffle, which can effectively block them. Furthermore, in order to prevent the blocked solids and liquids from accumulating at the bearing and affecting the filtering effect of the filter 500, a mud ring 520 can be set at the center.

[0032] Furthermore, the filter 500 can be arranged at an adjustable angle relative to the axial air inlet direction of the air guide 300. Figure 3 The conventional installation angle is shown, and the filter 500 is installed vertically, which can effectively recover the blocked solid and liquid into the three-phase separator 200. When the solid and liquid are relatively small, the filter 500 can be tilted toward the air inlet pipe 410, that is, the angle between the axial air inlet direction of the air guide pipe 300 and the windward surface of the filter 500 is increased, the ventilation volume is increased, and the VOCs purification efficiency of the overall device is improved.

[0033] As mentioned above, this case protects a semi-enclosed VOCs room-temperature catalytic treatment device for automobile repair workshops. All technical solutions that are the same or similar to this case should be deemed to fall within the scope of protection of this case.

Claims

1. A semi-enclosed VOCs room temperature catalytic treatment device for automobile repair workshops, characterized in that The invention comprises an air curtain (110) arranged at an open opening of a semi-enclosed workshop (100) to prevent waste gas and waste liquid from overflowing, a sprayer (120) for spraying waste gas and paint mist in the workshop, a sump (130) for collecting a mixture of paint and spray water, a three-phase separator (200) connected to the sump (130), the sump (130) and the three-phase separator (200) being connected via an air duct (300) capable of sucking the paint and spray water mixture in the sump (130) and the waste gas in the workshop, the three-phase separator (200) being capable of separating solid, liquid and gas, and being provided with an exhaust port (210), a liquid discharge port (220) and a slag discharge port (230); It also includes an air inlet pipe (410) arranged at the rear end of the exhaust port (210), a drying and filtering module (420), a normal temperature catalytic module (430), a centrifugal fan (440), and an air return pipe (450) arranged in sequence at the rear end of the air inlet pipe (410); At least a portion of the air guide duct (300) is in communication with the air inlet duct (410), and an axial air inlet direction of the air guide duct (300) forms an obtuse angle with an axial air inlet direction of the air inlet duct (410).

2. A semi-enclosed VOCs room temperature catalytic treatment device for automobile repair workshops as claimed in claim 1, characterized in that The air guide pipe (300) is a spiral air guide structure.

3. A semi-enclosed VOCs room temperature catalytic treatment device for automobile repair workshops as claimed in claim 1, characterized in that The air guide pipe (300) and the air inlet pipe (410) are in communication with each other via a filter (500) capable of blocking solids and liquids.

4. A semi-enclosed VOCs room temperature catalytic treatment device for automobile repair workshops as claimed in claim 3, characterized in that The filter (500) is provided with staggered superimposed blades (510).

5. A semi-enclosed VOCs room temperature catalytic treatment device for automobile repair workshops as claimed in claim 4, characterized in that A mud guard ring (520) is provided at the center of the blade.

6. A semi-enclosed VOCs room temperature catalytic treatment device for automobile repair workshops as claimed in claim 3, characterized in that The filter (500) can be arranged at an adjustable angle relative to the axial air inlet direction of the air guide pipe (300).

7. The semi-enclosed VOCs room temperature catalytic treatment device for automobile repair workshops as claimed in claim 1 is characterized in that The catalyst of the room temperature catalytic module (430) is a highly active supported transition metal oxide.

8. The semi-enclosed VOCs room temperature catalytic treatment device for automobile repair workshops as claimed in claim 7 is characterized in that The supported transition metal oxide is MnOx and / or CoOx and / or FeOx and / or NiO material.

9. The semi-enclosed VOCs room temperature catalytic treatment device for automobile repair workshops as claimed in claim 1, characterized in that A check valve (451) is provided at the connection between the return air duct (450) and the semi-enclosed workshop (100), and a conversion valve (452) is provided at the front end of the return air duct (450) and the check valve (451), so that outdoor discharge or indoor circulation can be selected.

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