Paint spray booth with catalytic combustion waste gas treatment function

Abstract

The utility model provides a spray booth with catalytic combustion waste gas treatment, which comprises a venturi dust collector, a cyclone dust collector, a bag filter, a first fan and a zeolite rotating wheel which are sequentially connected, and the air outlet end of the first fan is divided into two branches which are respectively connected with the air inlet ends of an adsorption area and a cooling area of the zeolite rotating wheel; the gas outlet end of the adsorption area is connected with a smoke exhaust pipe, the gas outlet end of the cooling area is connected with the gas inlet end of the desorption area of the zeolite runner after passing through the first heat exchanger, the gas outlet end of the desorption area is connected with a second fan, and the gas outlet end of the second fan is connected with the smoke exhaust pipe after passing through the second heat exchanger, the catalytic combustion furnace, the second heat exchanger and the first heat exchanger in sequence. The paint spray booth with the catalytic combustion waste gas treatment function is compact in structure, low in use cost and maintenance cost, high in treatment efficiency, good in effect, low in energy consumption and environmentally friendly.

Description

Technical Field

[0001] The utility model relates to a paint spraying room, in particular to a paint spraying room with catalytic combustion waste gas treatment. Background Art

[0002] Paint spraying waste gas refers to the paint spray particles and other forms of organic waste gas generated during the spraying process. There are three main forms, namely, fine water droplets carrying or dissolving paint particles; paint mist particles suspended in the surrounding air due to the inability to spray onto the surface of the object during high-pressure spraying, and organic pollution caused by the use of organic paint thinners; odors caused by the special materials of the paint itself, organic substances such as thinners, and odor pollution caused by the paint during the curing process after spraying.

[0003] In order to prevent waste gas from entering the atmosphere and causing pollution, the air in the workshop needs to be treated before being discharged. The existing waste gas treatment device has a complex structure, high cost and low efficiency. Utility Model Content

[0004] [1] Technical issues to be solved

[0005] The technical problem to be solved by the utility model is to provide a spray booth with catalytic combustion waste gas treatment which has compact structure, low cost, high treatment efficiency and good effect.

[0006] 【2】Technical solutions to solve the problem

[0007] The utility model provides a paint spraying room with catalytic combustion exhaust gas treatment, which comprises a venturi dust collector 1, a cyclone dust collector 2, a bag filter 3, a first fan 51 and a zeolite rotor 6 connected in sequence, the air outlet end of the first fan 51 is branched into two paths and respectively connected to the air inlet ends of the adsorption zone and the cooling zone of the zeolite rotor 6, the air outlet end of the adsorption zone is connected to the smoke exhaust pipe 8, the air outlet end of the cooling zone is connected to the first air inlet end of the first heat exchanger 7, the first air outlet end of the first heat exchanger 7 is connected to the zeolite rotor The air inlet end of the desorption zone of the wheel 6 is connected, the air outlet end of the desorption zone is connected to the second fan 52, the air outlet end of the second fan 52 is connected to the first air inlet end of the second heat exchanger 10, the first air outlet end of the second heat exchanger 10 is connected to the catalytic combustion furnace 9, the air outlet end of the catalytic combustion furnace 9 is connected to the second air inlet end of the second heat exchanger 10, the second air outlet end of the second heat exchanger 10 is connected to the second air inlet end of the first heat exchanger 7, and the second air outlet end of the first heat exchanger 7 is connected to the smoke exhaust pipe 8.

[0008] Furthermore, the bag filter 3 includes a first filter, a second filter and a third filter which are arranged in sequence, the first filter is used to filter paint mist with a particle size greater than or equal to 5 μm, the second filter is used to filter paint mist with a particle size greater than 0.5 μm and less than 5 μm, and the third filter is used to filter paint mist with a particle size less than or equal to 0.5 μm.

[0009] Furthermore, a humidifier 4 for adjusting the humidity of the gas is provided between the bag filter 3 and the first fan 51 .

[0010] Furthermore, the humidifier 4 is used to adjust the humidity so that the relative humidity at the air outlet is less than 80%.

[0011] Furthermore, it also includes a third heat exchanger 11, the first inlet end of the third heat exchanger 11 is connected to the second outlet end of the first heat exchanger 7, the first outlet end of the third heat exchanger 11 is connected to the smoke exhaust pipe 8, the second inlet end and the second outlet end of the third heat exchanger 11 are respectively connected to the water inlet end and the water outlet end of the fourth heat exchanger in the humidifier 4 and are used to provide thermal energy.

[0012] Furthermore, the rotation speed of the zeolite wheel 6 is 2-3 r / h.

[0013] Furthermore, the inlet temperature of the desorption zone is 180°C-220°C.

[0014] Furthermore, the catalytic combustion furnace 9 is a natural gas combustion furnace.

[0015] Furthermore, the air volume ratio of the adsorption zone, the cooling zone and the desorption zone of the zeolite rotor 6 is 10:1:1.

[0016] 【3】Beneficial effects

[0017] The utility model is a paint spray booth with catalytic combustion exhaust gas treatment, which is provided with a pre-treatment device, which adopts multiple filters to quickly filter the gas and remove most of the paint mist particles with a particle size of more than 0.5μm in the exhaust gas, which greatly reduces the mass concentration of particulate matter when the exhaust gas enters the rotor, and improves the adsorption efficiency and service life of the zeolite rotor; the use of precious metal catalytic combustion can achieve efficient purification of VOCs at low temperature, reduce catalyst damage, thereby increasing service life and reducing the cost of use; the multi-heat exchanger structure is set up, which can recover the heat discharged by the combustion furnace to provide a heat source for desorption and humidity adjustment, which greatly reduces energy consumption and avoids hot air being directly discharged into the atmosphere to cause thermal pollution; the utility model is a paint spray booth with catalytic combustion exhaust gas treatment, which has a compact structure, low use cost and maintenance cost, high treatment efficiency and good effect, low energy consumption and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a connection diagram of a paint spray booth with catalytic combustion exhaust gas treatment according to the utility model;

[0019] Figure 2 The utility model is a schematic diagram of the structure of the zeolite wheel of the paint spraying room with catalytic combustion waste gas treatment. DETAILED DESCRIPTION

[0020] The following is a detailed description of the embodiments of the present utility model in conjunction with the accompanying drawings.

[0021] See also Figure 1-Figure 2 The utility model provides a paint spraying room with catalytic combustion exhaust gas treatment, which can treat the exhaust gas in the spraying room, and includes a venturi dust collector 1, a cyclone dust collector 2, a bag filter 3, a first fan 51, a zeolite wheel 6, a first heat exchanger 7, a second heat exchanger 10 and a catalytic combustion furnace 9.

[0022] The air inlet end of the venturi dust collector 1 is connected to the jet room, which is used to inhale harmful gases in the paint spraying room. The venturi is thick on both sides and thin in the middle. The thin section has a throat and a water pipe in the middle for spraying water. When the air passes through the throat, the flow rate increases, and the water pipe sprays water. The water is separated into fine water droplets at high speed, which collide with the dust in the throat to make its particles smaller and absorbed by the dust. It can capture the paint mist particles in the exhaust gas and condense them into large particles; the cyclone dust collector 2 is arranged at the air outlet end of the venturi dust collector 1, which separates large particles of paint mist through centrifugal motion and plays the function of primary filtration; the combination of the above-mentioned venturi dust collector 1 and the cyclone dust collector 2 can achieve a counting filtration efficiency of up to 95% for paint mist with a particle size of more than 5μm.

[0023] The bag filter 3 is arranged at the air outlet of the cyclone dust collector, and is used for further filtering and dust removal of the gas. In this embodiment, the bag filter 3 is a multi-layer filtering structure, and includes a first filter, a second filter and a third filter in sequence from the air inlet end to the air outlet end, wherein the first filter is used to filter paint mist with a particle size greater than or equal to 5 μm, the second filter is used to filter paint mist with a particle size greater than 0.5 μm and less than 5 μm, and the third filter is used to filter paint mist with a particle size less than or equal to 0.5 μm; through the joint action of the venturi dust collector 1, the cyclone dust collector 2 and the bag filter 3, the fine paint mist in the paint spraying exhaust gas can be efficiently removed, and the counting filtration efficiency of the paint mist above 0.5 μm in the exhaust gas is greater than 96%, which can ensure that the mass concentration of particulate matter is <1 mg / m when the exhaust gas enters the runner 3 , thereby improving the adsorption efficiency and service life of the zeolite wheel.

[0024] The first fan 51 is arranged at the air outlet end of the bag filter 3, and is used to provide gas delivery power. The air outlet end of the first fan 51 is connected to the zeolite rotor 6. Specifically, the air outlet end of the first fan 51 is branched into two paths, which are respectively connected to the air inlet ends of the adsorption zone and the cooling zone of the zeolite rotor 6. The air outlet end of the adsorption zone is connected to the smoke exhaust pipe 8 to achieve discharge. The air outlet end of the cooling zone is connected to the first air inlet end of the first heat exchanger 7. The first air outlet end of the first heat exchanger 7 is connected to the air inlet end of the desorption zone of the zeolite rotor 6. The air inlet temperature of the desorption zone is 180°C-220°C, and it is heated by the first heat exchanger. The zeolite rotor 6 includes a rotatably mounted rotor, and the rotor is composed of a hydrophobic zeolite adsorption The medium is made of ceramic fiber, and the rotor is equipped with a gas sealing pad made of a material resistant to VOCs corrosion and high temperature, which isolates the rotor into three areas: adsorption zone 651, desorption zone 652 and cooling zone 653. The air volume ratio of the adsorption zone, cooling zone and desorption zone of the zeolite rotor 6 is 10:1:1, and the rotor rotates continuously at a lower speed. In this embodiment, the rotation speed of the zeolite rotor 6 is 2-3r / h, and the exhaust gas is blown into the adsorption zone of the rotor by the first fan 51. The treated clean air is discharged into the smoke exhaust pipe and discharged into the atmosphere. When the adsorption is saturated, it is transferred to the desorption zone. The high-temperature exhaust gas desorbs and regenerates the adsorbed VOCs. After regeneration, it is transferred to the cooling zone and continues to adsorb after cooling.

[0025] The air outlet end of the desorption zone is connected to the second fan 52, the air outlet end of the second fan 52 is connected to the first air inlet end of the second heat exchanger 10 for absorbing heat, the first air outlet end of the second heat exchanger 10 is connected to the catalytic combustion furnace 9, the air outlet end of the catalytic combustion furnace 9 is connected to the second air inlet end of the second heat exchanger 10, the second air outlet end of the second heat exchanger 10 is connected to the second air inlet end of the first heat exchanger 7 for heating the gas entering the desorption zone, and the second air outlet end of the first heat exchanger 7 is connected to the smoke exhaust pipe 8; in this embodiment, the catalytic combustion furnace 9 is a natural gas combustion furnace, which uses a catalyst to decompose high-concentration VOCs into carbon dioxide and water through an oxidation reaction at a lower temperature. The catalyst in this embodiment is a precious metal catalyst, which can achieve efficient purification of VOCs at low temperatures, which can reduce the overall cost of use.

[0026] In this embodiment, a humidifier 4 is provided between the bag filter 3 and the first fan 51, and the humidifier 4 is used to adjust the humidity and make the relative humidity at the air outlet less than 80%. A fourth heat exchanger is provided in the humidifier for heating the exhaust gas and achieving humidity adjustment.

[0027] At the same time, it also includes a third heat exchanger 11, a first inlet end of the third heat exchanger 11 is connected to the second air outlet end of the first heat exchanger 7, a first outlet end of the third heat exchanger 11 is connected to the smoke exhaust pipe 8, a second inlet end of the third heat exchanger 11 is connected to the water outlet end of the fourth heat exchanger, and a second outlet end of the third heat exchanger 11 is connected to the water inlet end of the fourth heat exchanger, which is used to provide a heat source for the humidifier, thereby reducing power consumption and avoiding thermal pollution.

[0028] In this embodiment, the first inlet end and the first outlet end of the first heat exchanger, the second heat exchanger and the third heat exchanger are connected to form a pipeline, and the second inlet end and the second outlet end are connected to form another pipeline. The two pipelines realize heat transfer through fins, etc., and then realize heat exchange.

[0029] The utility model is a paint spray booth with catalytic combustion exhaust gas treatment, which is provided with a pre-treatment device, which adopts multiple filters to quickly filter the gas and remove most of the paint mist particles with a particle size of more than 0.5μm in the exhaust gas, which greatly reduces the mass concentration of particulate matter when the exhaust gas enters the rotor, and improves the adsorption efficiency and service life of the zeolite rotor; the use of precious metal catalytic combustion can achieve efficient purification of VOCs at low temperature, reduce catalyst damage, thereby increasing service life and reducing the cost of use; the multi-heat exchanger structure is set up, which can recover the heat discharged by the combustion furnace to provide a heat source for desorption and humidity adjustment, which greatly reduces energy consumption and avoids hot air being directly discharged into the atmosphere to cause thermal pollution; the utility model is a paint spray booth with catalytic combustion exhaust gas treatment, which has a compact structure, low use cost and maintenance cost, high treatment efficiency and good effect, low energy consumption and environmental protection.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A paint spraying room with catalytic combustion exhaust gas treatment, characterized in that: It includes a venturi dust collector, a cyclone dust collector, a bag filter, a first fan and a zeolite rotor connected in sequence, the air outlet end of the first fan branches into two paths and is respectively connected to the air inlet ends of the adsorption zone and the cooling zone of the zeolite rotor, the air outlet end of the adsorption zone is connected to the smoke exhaust pipe, the air outlet end of the cooling zone is connected to the first air inlet end of the first heat exchanger, the first air outlet end of the first heat exchanger is connected to the air inlet end of the desorption zone of the zeolite rotor, the air outlet end of the desorption zone is connected to the second fan, the air outlet end of the second fan is connected to the first air inlet end of the second heat exchanger, the first air outlet end of the second heat exchanger is connected to the catalytic combustion furnace, the air outlet end of the catalytic combustion furnace is connected to the second air inlet end of the second heat exchanger, the second air outlet end of the second heat exchanger is connected to the second air inlet end of the first heat exchanger, and the second air outlet end of the first heat exchanger is connected to the smoke exhaust pipe.

2. The paint spraying room with catalytic combustion exhaust gas treatment as claimed in claim 1, characterized in that: The bag filter includes a first filter, a second filter and a third filter arranged in sequence, the first filter is used to filter paint mist with a particle size greater than or equal to 5 μm, the second filter is used to filter paint mist with a particle size greater than 0.5 μm and less than 5 μm, and the third filter is used to filter paint mist with a particle size less than or equal to 0.5 μm.

3. The paint spraying room with catalytic combustion exhaust gas treatment as claimed in claim 1, characterized in that: A humidifier for adjusting the humidity of the gas is provided between the bag filter and the first fan.

4. The paint spraying room with catalytic combustion exhaust gas treatment as claimed in claim 3, characterized in that: The humidifier is used to adjust the humidity and make the relative humidity at the air outlet less than 80%.

5. The paint spraying room with catalytic combustion exhaust gas treatment as claimed in claim 3, characterized in that: It also includes a third heat exchanger, wherein the first inlet end of the third heat exchanger is connected to the second outlet end of the first heat exchanger, the first outlet end of the third heat exchanger is connected to the smoke exhaust pipe, and the second inlet end and the second outlet end of the third heat exchanger are respectively connected to the water inlet end and the water outlet end of the fourth heat exchanger in the humidifier and are used to provide heat energy.

6. The paint spraying room with catalytic combustion exhaust gas treatment as claimed in claim 1, characterized in that: The rotation speed of the zeolite wheel is 2-3 r / h.

7. The paint spraying room with catalytic combustion exhaust gas treatment as claimed in claim 1, characterized in that: The inlet temperature of the desorption zone is 180°C-220°C.

8. The paint spraying room with catalytic combustion exhaust gas treatment as claimed in claim 1, characterized in that: The catalytic combustion furnace is a natural gas combustion furnace.

9. The paint spraying room with catalytic combustion exhaust gas treatment as claimed in claim 1, characterized in that: The air volume ratio of the adsorption zone, the cooling zone and the desorption zone of the zeolite rotor is 10:1:1.

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