CN208130662U - Paint spray booth's organic waste gas treatment system - Google Patents

Abstract

The utility model discloses a treatment system for organic waste gas in a painting room, which comprises a dry filter, an adsorption and desorption box, a catalytic combustion device, an adsorption fan, a desorption fan and an air supply fan, three adsorption and desorption boxes are provided, and the catalytic combustion The device is equipped with a preheating chamber, a catalytic bed, a heat exchanger and a first thermocouple. There is a heater in the preheating chamber; it also includes a PLC control system, which includes a PLC controller and a first thermocouple installed in the adsorption and desorption box. A thermocouple, a first over-temperature alarm, a second over-temperature alarm installed in the catalytic combustion device, and a differential pressure gauge installed in the dry filter, and the PLC controller is installed in a control cabinet. The utility model solves the problems that the waste gas from spray painting is easy to block and the waste gas cannot reach the standard stably, and the system has a high degree of automation and intelligence, has a good treatment effect on the waste gas, and has a purification efficiency of >98%, which meets and is higher than the national discharge standard; and can On-line catalytic combustion treatment of exhaust gas to achieve zero emission of exhaust gas.

Description

Organic waste gas treatment system in spray booth

technical field

The utility model relates to the technical field of exhaust gas treatment, in particular to an exhaust gas treatment system for a spray booth.

Background technique

The main components of spray paint exhaust gas are paint spray dust and volatilized benzene, toluene, xylene, etc. Random discharge will have a certain impact on the surrounding environment. Therefore, it needs to be discharged after certain treatment.

The traditional treatment process mainly includes: paint exhaust gas→water spray tower→dry-wet separation→primary effect filter→activated carbon adsorption→discharge.

Due to the viscosity of paint powder, activated carbon adsorption is used to treat organic waste gas. After the activated carbon is saturated, catalytic combustion is used to desorb it. The exhaust gas discharged from the spray booth contains a certain amount of paint mist, which is a viscous substance. Therefore, before the exhaust gas enters the activated carbon adsorption device, it must be Pretreatment must be carried out, otherwise, the exhaust gas entering the activated carbon adsorption device will cause unnecessary trouble, and even make the activated carbon invalid, because the sticky particles in the exhaust gas will easily "block" the activated carbon.

For example, the Chinese patent "Painting Exhaust Gas Treatment System", application publication number: CN 105289156 A, the treatment effect of the disclosed exhaust gas treatment system in the spray booth is not ideal, and the filtering effect on the dust or paint residue generated by spray painting is not good, and it is easy to cause damage to subsequent equipment. Congestion, higher operating costs.

Therefore, it is necessary to develop a low-cost, high-efficiency, and easy-to-maintain waste gas treatment technology.

In order to overcome the above-mentioned defects, those skilled in the art actively conduct innovative research in order to create a system for treating organic waste gas in a spray booth.

Utility model content

Aiming at the problems existing in the prior art, the utility model provides a treatment system for organic waste gas in the spray booth, which solves the problems that the waste gas from spray painting is easy to block and the waste gas cannot reach the standard stably. The effect is good, the purification efficiency is >98%, which meets and exceeds the national emission standard; and it can process the exhaust gas catalytic combustion online to achieve zero emission of exhaust gas.

In order to solve the above technical problems, a technical solution adopted by the utility model is to provide a treatment system for organic waste gas in a spray booth, including a dry filter, an adsorption and desorption box, a catalytic combustion device, an adsorption fan, a desorption fan and an air supplement fan, the adsorption-desorption box is provided with three, and each of the adsorption-desorption boxes has an adsorption air inlet, an adsorption air outlet, a desorption air inlet and a desorption air outlet, and the inlet of the dry filter The air port is connected to the exhaust gas collection pipeline, the air outlet of the dry filter is connected to the adsorption air inlet of the adsorption desorption box through the adsorption air intake pipeline, and the adsorption air outlet of the adsorption desorption box is connected to the adsorption fan through the adsorption air outlet pipeline connected, the air outlet of the adsorption fan is connected to the exhaust chimney; the desorption outlet of the adsorption and desorption box is connected with the catalytic combustion device through a desorption outlet pipeline, and the catalytic combustion device is connected with the adsorption and desorption box The desorption air inlet is connected by a return air duct, the return air duct includes a first return air duct and a second return air duct, the first return air duct is provided with a desorption fan, and the first return air duct is simultaneously connected with the The second return air duct is connected to the exhaust duct; the air supply fan is arranged on the air supply pipeline, one end of the air supply pipeline communicates with the air, and the other end is connected with the desorption air outlet pipeline;

The waste gas collection pipeline is also connected to the maintenance pipeline, the waste gas collection pipeline is provided with an intake valve, the maintenance pipeline is provided with a maintenance valve, the adsorption intake pipeline is provided with an adsorption intake valve, and the adsorption outlet pipeline is provided with Adsorption air outlet valve, the desorption air outlet pipeline is provided with a desorption air outlet valve, the second air return pipeline is provided with a return air valve, the exhaust air pipeline is provided with an exhaust valve, and the air supply pipeline is provided with an air supply valve valve;

The catalytic combustion device is provided with a preheating chamber, a catalytic bed, a heat exchanger and a first thermocouple, and a heater is provided in the preheating chamber;

The desorption gas outlet pipeline is located upstream of the catalytic combustion device and is provided with a fire arrester and dust collector. There are multiple layers of metal mesh in the fire arrester and dust collector, and the thickness of each layer of metal mesh is 1-2mm. The metal mesh The length of the grid is 0.2-0.3mm and the width is 0.05-0.1mm;

Also includes a PLC control system, the PLC control system includes a PLC controller, a second thermocouple installed in the adsorption-desorption box, a first over-temperature alarm, and a second over-temperature alarm installed in the catalytic combustion device The device and the differential pressure gauge located on the dry filter, the PLC controller is installed in the control cabinet, the adsorption fan, desorption fan, air supply fan, intake valve, maintenance valve, adsorption intake valve, Adsorption outlet valve, desorption outlet valve, air return valve, exhaust valve, air supply valve, heat exchanger, first thermocouple, heater, second thermocouple, first over-temperature alarm and second over-temperature alarm devices are respectively electrically connected to the PLC controller.

Furthermore, the adsorption fan is a variable frequency fan with a frequency converter.

Further, the filter material of the dry filter is a dry packing layer and a medium-efficiency filter layer, the dry packing layer is located upstream of the medium-efficiency filter layer, and the dry packing layer is a Pall ring packing, And the thickness of the dry packing layer>500mm, the medium-efficiency filter layer includes a metal mesh frame and a filter material sandwiched in the metal mesh frame, and the filter material is made of synthetic fiber non-woven fabric and aluminum composite A pleated composite filter material.

Furthermore, the adsorption-desorption box includes a fire emergency automatic sprinkler system, and the fire emergency automatic sprinkler system is electrically connected to the PLC controller.

Furthermore, the metal mesh frame is made of galvanized sheet with a thickness of 1.5 mm, and the shell of the dry filter is made of steel plate with a thickness of 3 mm.

Further, the differential pressure setting value of the differential pressure gauge of the dry filter is 300-350Pa.

Further, the shell of the adsorption and desorption box is a shell made of a steel plate with a thickness of 3mm, and the adsorption air intake pipe is a galvanized steel pipe with a wall thickness of 1.2mm, and the honeycomb shape is filled in the adsorption and desorption box. activated carbon, and the honeycomb activated carbon has a bulk density of 400-450kg/m ³ .

Further, the catalytic combustion device has an explosion-proof device, which is a diaphragm pressure relief type explosion-proof device, and the explosion-proof device is electrically connected to the PLC controller.

Further, the outer periphery of the catalytic combustion device has an insulating layer, the insulating layer is 80kg/m ³ rock wool insulating layer, and the thickness of the insulating layer is 100mm; the first return air duct and the The desorption outlet pipes are all carbon steel pipes with a wall thickness of 1.2mm.

Further, the catalytic combustion chamber adopts the noble metal catalyst of the ceramic honeycomb body.

The beneficial effects of the utility model are:

The utility model can solve the problem of incomplete heating, catalytic combustion and regeneration of organic waste gas in the paint spraying room, and the desorption process must be stopped for desorption, the desorption combustion temperature changes too much and frequent accidents in the catalytic combustion regeneration process, so that the quality of waste gas combustion and emission can be improved. It can meet the requirements of environmental protection, and greatly improve the purification efficiency of exhaust gas, and because the exhaust gas is desorbed from the adsorption material, the adsorption material can be regenerated and recycled. Thoroughly, the combustion temperature is more stable, and avoid excessive combustion or oxygen-deficient combustion interruption; the treatment effect on exhaust gas is good, the purification efficiency is >98%, which meets and exceeds the national emission standard;

Moreover, there are impurities with large particles such as dust and paint slag in the organic waste gas of the spray booth. After preliminary filtration by the dry filter, they can be filtered out to prevent the organic waste gas from the spray booth from directly entering the adsorption and desorption box, causing its blockage and reducing equipment. operating failure rate;

The adsorption and desorption box of the utility model adopts honeycomb-shaped activated carbon, which has superior thermodynamic properties, low resistance, low consumption, high adsorption rate, etc., and is extremely suitable for use under large air volumes;

The utility model includes a catalytic combustion device. The catalytic combustion chamber adopts the noble metal catalyst of the ceramic honeycomb body, which has small resistance and can operate normally with a low-pressure fan. It not only consumes less power but also has low noise. One, at the same time, the heating power is maintained for about 1 hour to save energy. The adsorption and desorption box for adsorbing organic waste gas can be desorbed and regenerated with the heat generated by catalytic combustion treatment of waste gas. The desorbed gas is then sent to the catalytic combustion chamber for purification. Additional energy is required, the operating cost is low, and the energy saving effect is remarkable.

The above description is only an overview of the technical solution of the utility model. In order to understand the technical means of the utility model more clearly and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiment of the utility model with accompanying drawings. back.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the control schematic diagram of the utility model;

The parts are marked as follows in the accompanying drawings:

Dry filter 1, adsorption and desorption box 2, catalytic combustion device 3, desorption fan 4, adsorption fan 5, air supply fan 6, waste gas collection pipe 7, adsorption inlet pipe 8, adsorption outlet pipe 9, exhaust chimney 10. Desorption outlet pipe 11, return air pipe 12, first return air pipe 13, second return air pipe 14, exhaust pipe 15, air supply pipe 16, inspection pipe 17, intake valve 18, inspection valve 19, Adsorption inlet valve 20, adsorption outlet valve 21, desorption outlet valve 22, return air valve 23, exhaust valve 24, catalytic bed 25, heat exchanger 26, first thermocouple 27, heater 28, PLC controller 29 , The second thermocouple 30, the first over-temperature alarm 31, the second over-temperature alarm 32, the differential pressure gauge 33, the control cabinet 34, the gas supply valve 36 and the fire arrester and dust collector 37.

Detailed ways

The specific implementation of the present utility model is described below through specific specific examples, and those skilled in the art can easily understand the advantages and effects of the present utility model from the content disclosed in this specification. The utility model can also be implemented in other different ways, that is, various modifications and changes can be made without departing from the scope disclosed in the utility model.

Embodiment: A treatment system for organic waste gas in a spray booth, as shown in Figure 1 and Figure 2, including a dry filter 1, an adsorption and desorption box 2, a catalytic combustion device 3, an adsorption fan 5, a desorption fan 4 and an air supplement Fan 6, the adsorption-desorption box is provided with three, each of the adsorption-desorption boxes has an adsorption air inlet, an adsorption air outlet, a desorption air inlet and a desorption air outlet, and the dry filter The air inlet is connected to the waste gas collection pipeline 7, the air outlet of the dry filter is connected with the adsorption air inlet of the adsorption desorption box through the adsorption air intake pipeline 8, and the adsorption air outlet of the adsorption desorption box is passed through the adsorption fan. The adsorption outlet pipeline 9 is connected, and the air outlet of the adsorption fan is connected with the exhaust chimney 10; the desorption outlet of the adsorption desorption box is connected with the catalytic combustion device through the desorption outlet pipeline 11, and the catalytic combustion device is connected with the exhaust gas outlet. The desorption air inlet of described adsorption-desorption box is connected by return air duct 12, and described return air duct comprises first return air duct 13 and second return air duct 14, and described first return air duct is provided with desorption Fan, the first return air duct is connected with the second return air duct and the exhaust duct 15 at the same time; the air supply fan is located in the air supply duct 16, one end of the air supply duct is communicated with the air, and the other end is connected with the desorption outlet. pipe connection;

The waste gas collection pipeline is also connected to the maintenance pipeline 17, the waste gas collection pipeline is provided with an intake valve 18, the maintenance pipeline is provided with a maintenance valve 19, and the adsorption intake pipeline is provided with an adsorption intake valve 20, and the adsorption The outlet pipeline is provided with an adsorption outlet valve 21, the desorption outlet pipeline is provided with a desorption outlet valve 22, the second air return pipeline is provided with a return valve 23, and the exhaust pipeline is provided with an exhaust valve 24, so The air supply pipeline is provided with an air supply valve 36;

Described catalytic combustion device is provided with preheating chamber, catalytic bed 25, heat exchanger 26 and first thermocouple 27, and heater 28 is arranged in described preheating chamber;

Described desorption gas outlet pipeline is positioned at the upstream of described catalytic combustion device and is provided with fire arresting dust collector 37, has multi-layer metal mesh in described fire arrester dust collector, and the thickness of every layer of metal mesh is 1-2mm, and described metal The mesh of the net has a length of 0.2-0.3 mm and a width of 0.05-0.1 mm;

It also includes a PLC control system, the PLC control system includes a PLC controller 29, a second thermocouple 30 installed in the adsorption-desorption box and a first over-temperature alarm 31, a second thermocouple installed in the catalytic combustion device Over-temperature alarm 32 and differential pressure gauge 33 located on the dry filter, the PLC controller is installed in the control cabinet 34, the adsorption fan, desorption fan, air supply fan, intake valve, maintenance valve , adsorption inlet valve, adsorption outlet valve, desorption outlet valve, return air valve, exhaust valve, air supply valve, heat exchanger, first thermocouple, heater, second thermocouple, first over-temperature alarm and the second over-temperature alarm are respectively electrically connected to the PLC controller.

The adsorption fan is a variable frequency fan with a frequency converter.

The filter material of the dry filter is a dry packing layer and a medium-efficiency filter layer, the dry packing layer is located upstream of the medium-efficiency filter layer, the dry packing layer is a Pall ring packing, and the dry The thickness of the packing layer is >500mm. The medium-efficiency filter layer includes a metal mesh frame and a filter material sandwiched in the metal mesh frame. Composite filter.

The adsorption-desorption box includes a fire emergency automatic sprinkler system, and the fire emergency automatic sprinkler system is electrically connected to the PLC controller.

The metal screen frame is a screen frame made of galvanized sheet with a thickness of 1.5 mm, and the shell of the dry filter is a shell made of a steel plate with a thickness of 3 mm.

The differential pressure setting value of the differential pressure gauge of the dry filter is 300-350Pa.

The shell of the adsorption-desorption box is a shell made of a steel plate with a thickness of 3mm, and the adsorption air intake pipeline is a galvanized steel pipe with a wall thickness of 1.2mm, and honeycomb activated carbon is filled in the adsorption-desorption box, and the The bulk density of the honeycomb activated carbon is 400-450kg/m ³ .

The catalytic combustion device has an explosion-proof device, which is a diaphragm pressure relief type explosion-proof device, and the explosion-proof device is electrically connected to the PLC controller.

The outer periphery of described catalytic combustion device has thermal insulation layer, and described thermal insulation layer is the rock wool thermal insulation layer of 80kg/ ^m , and the thickness of described thermal insulation layer is 100mm; All are carbon steel pipes with a wall thickness of 1.2mm

In this embodiment, among the three adsorption-desorption boxes, two of the adsorption-desorption boxes are in the adsorption process, and one of the adsorption-desorption boxes is in the desorption process.

In this embodiment, the waste gas treatment capacity of the organic waste gas treatment system in the spray booth is 3000 cubic meters per hour, the preheating temperature of the catalytic combustion device is 220-250°C, and the desorption fan works under negative pressure , the power of the heater is 48kW, and the power of the adsorption fan is 37kW.

In this embodiment, the exhaust chimney is a noise reduction chimney.

Working process and working principle of the present utility model are as follows:

Under the control of the PLC control system, the organic waste gas generated in the spray booth is drawn by the adsorption fan and enters the dry filter through the waste gas collection pipe to filter out impurities such as large dust, particles and paint slag, and then passes through the adsorption air intake pipe , enter the adsorption and desorption box for the adsorption of benzene and other organic volatile gases in the waste gas, and then discharge through the adsorption outlet pipe and discharge chimney up to the standard. During this process, the adsorption inlet valve and the adsorption outlet valve are opened, the return air valve and the desorption outlet valve closure;

There are three adsorption-desorption boxes, two of which carry out the above-mentioned adsorption process, and the other one carries out the gas desorption process under the control of the PLC control system, and switches and controls the inlet and outlet valves of the adsorption-desorption box. Attachment and adsorption are interlocking, so that desorption and adsorption operate separately. Compared with the traditional treatment device with only one adsorption box, it needs to stop the line after the adsorption is completed and then perform desorption and purification. The efficiency is high and the effect is good;

The desorption process of the adsorption and desorption box is that under the control of the PLC control system, the adsorption inlet valve and the adsorption outlet valve are closed, the return air valve and the desorption outlet valve are opened, and the desorption gas enters the adsorption and desorption box through the return air pipe. , to desorb the adsorbed benzene and other organic substances, the desorbed gas enters the catalytic combustion device through the desorption outlet pipe, and after the desorbed gas is catalytically burned to the standard, the desorption continues through the first return air duct and the second return air duct , when the temperature is too high, it can be discharged through the exhaust valve and exhaust pipe; and in the process of catalytic combustion, if the combustion is not sufficient, it can be replenished into the catalytic combustion device through the air supply pipeline under the action of the air supply fan. Air, by controlling the air required for combustion, controlling the combustion temperature, and controlling the stability of combustion, so that the desorbed gas can be evenly and continuously fully catalytically combusted in the catalytic combustion bed;

And during the desorption process, when the temperature in the adsorption and desorption box is too high, under the control of the PLC control system, the fire emergency automatic sprinkler system is automatically activated to ensure the safety and normal operation of the system.

The above description is only an embodiment of the present utility model, not therefore the above description is only an embodiment of the present utility model, and therefore does not limit the scope of patents of the present utility model. structure, or directly or indirectly used in other related technical fields, are all included in the patent protection scope of the utility model in the same way.

Claims (9)

1. a kind of paint spray booth's organic waste gas treatment system, it is characterised in that：Including dry filter (1), adsorption/desorption case (2), Catalytic combustion system (3), absorption blower (5), desorption blower (4) and tonifying Qi blower (6), there are three the adsorption/desorption case is set, Each adsorption/desorption case all has absorption air inlet, absorption gas outlet, desorption air inlet and desorption gas outlet, the dry type The air inlet of filter connects gas sampling pipeline (7), the absorption of the gas outlet of the dry filter and adsorption/desorption case into Port passes through absorption outlet by absorption admission line (8) connection, the absorption gas outlet of the adsorption/desorption case and absorption blower The air outlet of pipeline (9) connection, the absorption blower connects exhaust chimney (10)；The desorption gas outlet of the adsorption/desorption case with For the catalytic combustion system by desorption outlet pipe (11) connection, the catalytic combustion system is de- with the adsorption/desorption case Attached air inlet is connected by return air duct (12), and the return air duct includes the first return air duct (13) and the second return air duct (14), first return air duct be equipped with desorption blower, the first return air duct simultaneously with the second return air duct and exhaust duct (15) it connects；The tonifying Qi blower is set to tonifying Qi pipeline (16), one end of the tonifying Qi pipeline and air communication, the other end and de- Attached outlet pipe connection；

The gas sampling pipeline is also connected with service conduits (17), and the gas sampling pipeline is equipped with intake valve (18), the inspection Pipeline is repaired equipped with service valve (19), the absorption admission line is equipped with absorption intake valve (20), and the absorption outlet pipe is equipped with Adsorption outlet valve (21), the desorption outlet pipe are equipped with desorption air outlet valve (22), and second return air duct is equipped with air returning valve (23), the exhaust duct is equipped with exhaust valve (24), and the tonifying Qi pipeline is equipped with aeration valve (36)；

Preheating chamber, catalytic bed (25), heat exchanger (26) and the first thermocouple (27) are equipped in the catalytic combustion system, it is described pre- There are heater (28) in hot cell；

The upstream that outlet pipe is desorbed and is located at the catalytic combustion system is equipped with back-fire relief deduster (37), and the back-fire relief removes There is in dirt device multiple layer metal net, every layer of metal mesh with a thickness of 1-2mm, a length of 0.2-0.3mm of the grid of the metal mesh And width is 0.05-0.1mm；

It further include PLC control system, the PLC control system includes PLC controller (29), is installed on the adsorption/desorption case Second thermocouple (30) and the first overtemperature alarm (31), the second overtemperature alarm for being installed on the catalytic combustion system (32) and set on the dry filter differential manometer (33), the PLC controller is installed on control cabinet (34), the absorption wind Machine, desorption blower, tonifying Qi blower, intake valve, service valve, absorption intake valve, adsorption outlet valve, desorption air outlet valve, air returning valve, row Air-valve, aeration valve, heat exchanger, the first thermocouple, heater, the second thermocouple, the first overtemperature alarm and the second overtemperature alarm Device is all electrically connected with the PLC controller respectively.

2. paint spray booth's organic waste gas treatment system according to claim 1, it is characterised in that：The absorption blower be with The frequency conversion fan of frequency converter.

3. paint spray booth's organic waste gas treatment system according to claim 1, it is characterised in that：The filter of the dry filter Material is dry filler layer and medium air filtration layer, and the dry filler layer is located at the upstream of medium air filtration layer, the dry filler layer For Pall ring filler, and the thickness of the dry filler layer>500mm, the medium air filtration layer include metal screen frame and are sandwiched in institute The filtering material of metal screen frame is stated, the filtering material is that the accordion made of non-woven fabrics of synthetic fiber and aluminium compound is compound Filter material.

4. paint spray booth's organic waste gas treatment system according to claim 1, it is characterised in that：The adsorption/desorption case includes Fire disaster emergency automatic sprinkler fire-extinguishing system, the fire disaster emergency automatic sprinkler fire-extinguishing system are electrically connected with the PLC controller.

5. paint spray booth's organic waste gas treatment system according to claim 3, it is characterised in that：The metal screen frame is to use Screen frame made of the galvanized sheet of 1.5mm thickness, the shell of the dry filter are shells made of steel plate with a thickness of 3mm.

6. paint spray booth's organic waste gas treatment system according to claim 1, it is characterised in that：The pressure of the dry filter The pressure differential resetting value of difference meter is 300-350Pa.

7. paint spray booth's organic waste gas treatment system according to claim 1, it is characterised in that：Outside the adsorption/desorption case Shell is shell made of steel plate with a thickness of 3mm, and the absorption admission line is the coating steel pipe that wall thickness is 1.2mm, the suction Filled honeycomb shaped activated carbon in attached desorption case, and the bulk density of the Alveolate activated carbon is 400-450kg/m³。

8. paint spray booth's organic waste gas treatment system according to claim 1, it is characterised in that：The catalytic combustion system tool There is explosion-proof apparatus, the explosion-proof apparatus is diaphragm pressure release type explosion-proof apparatus, and the explosion-proof apparatus is electrically connected with the PLC controller.

9. paint spray booth's organic waste gas treatment system according to claim 1, it is characterised in that：The catalytic combustion system Periphery has insulating layer, and the insulating layer is 80kg/m³Rock wool heat-preservation layer, and the insulating layer with a thickness of 100mm；It is described First return air duct and the desorption outlet pipe are all the carbon steel pipes that wall thickness is 1.2mm.