Artificial leather foaming waste gas treatment method and system

Abstract

The invention relates to an artificial leather foaming waste gas treatment method and system. The system sequentially comprises a waste gas collection device, a filtering device, a cooling device, electrostatic oil fume purification equipment, an exhaust fan and a spraying and filtering device which are communicated with one another, the filter device is a filter screen; the cooling device is a dry type cooling device; the spraying filter box comprises a box body, a circulating water tank I arranged below the box body, a water pump I located in the circulating water tank I, a spraying device and a water-oil separation partition plate, the spraying device and the water-oil separation partition plate are arranged in the box body, the spraying device is connected with the water pump I, washing liquid is added into the circulating water tank I, and the water pump I is connected with the water-oil separation partition plate. And the spraying device and the water-oil separation partition plate are arranged front and back in parallel along the gas conveying direction. Through optimal design, dust, oil smoke and pollution gas in the artificial leather foaming waste gas can be effectively treated.

Description

Technical Field

[0001] The invention relates to the technical field of artificial leather foaming waste gas treatment, and in particular to an artificial leather foaming waste gas treatment method and system. Background Art

[0002] When PVC artificial leather is baked in a high-temperature foaming furnace, the raw materials such as resin, plasticizer, and foaming agent are used. When baked in a high-temperature foaming furnace, the temperature of the foaming furnace is usually 200-220°C. Chemical reactions will occur between the raw materials to produce new gas substances. Some raw materials will undergo thermal degradation at high temperatures, producing gaseous organic pollutants such as hydrocarbons and benzene series, forming oil-containing high-temperature waste gas. The main components of the waste gas include: plasticizers, plasticizer decomposition products (phthalic anhydride, alcohols, esters), and hydrogen chloride produced by the decomposition of PVC resin at high temperatures. Compared with ordinary restaurant fume exhaust gas, the temperature of artificial leather foaming exhaust gas is high, the exhaust gas is highly acidic (mainly containing a large amount of phthalic anhydride and a small amount of hydrogen chloride), and the odor is strong (phthalic anhydride). The temperature of the fume in the exhaust gas is about 130°C. The characteristics of foaming exhaust gas are high temperature and high concentration.

[0003] The waste gas treated by the common waste gas treatment system currently used still has a strong odor after being treated, which is harmful to human health and has been complained by nearby residents. Summary of the invention

[0004] In view of the above-mentioned current technical deficiencies, the present invention provides a method and system for treating artificial foaming waste gas.

[0005] The first aspect of the present invention provides an artificial leather foaming waste gas treatment system, which includes a waste gas collecting device, a filtering device, a cooling device, an electrostatic fume purification device, an exhaust fan, and a spray filtering device connected in sequence.

[0006] The filtering device is a filter screen;

[0007] The cooling device is a dry cooling device;

[0008] The spray filter box includes a box body, a circulating water tank I arranged below the box body, a water pump I located in the circulating water tank I, and a spray device and a water-oil separation partition arranged in the box body; the spray device is connected to the water pump I, washing liquid is added to the circulating water tank I, and the spray device and the water-oil separation partition are arranged side by side front and back along the gas conveying direction.

[0009] The exhaust gas of the production line is collected by the negative pressure of the exhaust fan. After collection, the large particles and dust are initially filtered through the filter device to avoid clogging the subsequent equipment. Then the high-temperature flue gas is cooled to condense the pollutants in the flue gas and gather into large oil fume particles, which are convenient for electrostatic adsorption. Then, it enters the electrostatic adsorption device. Through discharge, the mixed particles such as oil fume and dust in the gas are charged and negatively charged. Under the action of the high-voltage electric field, they gather on the anode plate for absorption and capture, and then slide down by their own weight and are discharged through the sewage outlet. For pollutant gases such as hydrogen chloride and anhydride in the gas, the washing liquid in the spray liquid is further used to absorb and neutralize the pollutant gas, and then the water and oil are separated through the partition. Moreover, the spray device and the water-oil separation partition are arranged in parallel along the gas conveying direction, changing the traditional structure of upper spray and lower partition water-oil isolation, which can lengthen the separation path, so that the fluid micro-groups are continuously mixed and collided in space, which helps the pollutants in the exhaust gas to mix more fully with the washing liquid, and improve the reaction rate and removal efficiency. In addition, the exhaust fan is located in front of the spray filter. The exhaust and air intake are through the exhaust fan. There is no need to increase the power of the exhaust fan, which saves costs. In addition, the airflow is smooth, which can better adsorb and filter.

[0010] The artificial leather foaming waste gas treatment system of the present invention can effectively treat dust, oil smoke and polluted gas in the artificial leather foaming waste gas through optimized design.

[0011] Preferably, the washing liquid is composed of 0.02% to 0.1% perchlorate, 1% to 5% sodium sulfate, 1% to 2% sodium hydroxide, and the balance of water, and the pH is 8-12. Among them, sodium hydroxide is an acid neutralizer, which is used to react with acids and anhydrides in the waste gas to produce salts and degrade esters in the waste gas. As a strong base, sodium hydroxide can provide enough hydroxide ions (OH-) to react with ester groups (COO-) in ester molecules to generate corresponding alcohols and carboxylates. This reaction process helps to convert ester pollutants in the waste gas into harmless substances. Perchlorate is a surfactant that can reduce surface tension and make the spray liquid more easily penetrate into the surface of oil droplets; secondly, it plays an emulsifying and dispersing role to evenly disperse the oil droplets in the spray liquid; finally, it has a solubilizing effect to stably dissolve the oil droplets in water. As an adsorbent, sodium sulfate can effectively adsorb on the surface of fine oil particles to prevent oil from agglomerating, polluting equipment, and clogging spray holes. The interaction of the three can reduce the amount of sodium hydroxide used, effectively remove oil stains, and prevent oil stains from accumulating and blocking the spray holes. Moreover, the cost is low, and most of them are inorganic reagents, so post-processing is easy.

[0012] Preferably, the box body is evenly divided into the first zone, the second zone, the third zone, the fourth zone and the fifth zone in the direction of gas delivery, with air intake from the bottom of the first zone and exhaust from the top of the fifth zone. The first zone and the second zone have the same height, which is H1, and the third zone, the fourth zone and the fifth zone have the same height, which is H2, and H1>H2. The spray device is arranged on the upper part of the first zone and has multi-stage spraying; the water-oil separation partition is arranged vertically at the junction of each zone alternately up and down; the water-oil separation partition is composed of a number of interlocking open grooves. By optimizing the structure, the multi-stage partition helps to strengthen the gas-liquid separation process, so that the water and oil droplets in the exhaust gas can be separated more effectively, and the filtering efficiency is improved.

[0013] Preferably, the cross section of the open groove is in the shape of an arc, and the angle of the arc is 80-120°, so that the water-oil separation efficiency is higher.

[0014] Preferably, the height of the water-oil separation partition is h, H1:H2=1.5~2:1, h:H2=1 / 2~1 / 3:1.

[0015] Preferably, the cooling device includes a water pump II, a circulating water tank II, a cooling tower and a multi-faceted tube heat exchange cooler, and adopts external dry cooling, so that water and flue gas do not come into direct contact and no wastewater is generated.

[0016] Preferably, the filter device is a metal filter, such as a stainless steel filter, which is more resistant to high temperatures.

[0017] Preferably, a fire damper is provided between the filtering device and the exhaust gas collecting device, and between the electrostatic fume purification equipment and the exhaust fan, which is safer.

[0018] The present invention also provides a method for treating artificial leather foaming waste gas using the above-mentioned treatment system, comprising the steps of:

[0019] S1 uses waste gas collection device to collect waste gas from foaming production line.

[0020] S2 removes particles from the exhaust gas through preliminary filtration by a filter device;

[0021] S3 uses a cooling device to reduce the gas temperature to ≤40℃;

[0022] S4 uses an electrostatic adsorption device to remove particulate matter from the gas after cooling;

[0023] The S5 gas enters the spray filter box and first comes into full gas-liquid contact with the washing liquid sprayed from the spray device. The gaseous pollutants in the exhaust gas undergo absorption and neutralization reaction with the washing liquid and are absorbed by the washing liquid. Then, the exhaust gas after spray washing passes through the water-oil separation partition for water-oil separation.

[0024] Preferably, in step S3, the gas temperature is lowered to 30-40° C. This can not only condense and aggregate the pollutants in the flue gas into oil fume particles of suitable particle size for convenient electrostatic adsorption, but also ensure that there is a suitable water vapor content in the oil fume exhaust gas, thereby ensuring the normal operation of the electrostatic oil fume removal equipment.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) The artificial leather foaming waste gas treatment system of the present invention can effectively absorb harmful gases, particles and dust in the artificial leather foaming waste gas by introducing a spray filtering device and optimizing the design. Moreover, the exhaust fan is arranged before the spray filtering device, and the investment cost and operation and maintenance cost are low.

[0027] 2) The present invention can effectively purify waste gas, adsorb polluted gas, remove oil stains, and prevent oil stains from accumulating and blocking spray holes by optimizing detergent ingredients. The cost is low, and most of the detergents are inorganic reagents, so post-processing is easy.

[0028] 3) The present invention can achieve better water-oil separation by optimizing the structure of the spray filtration device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the process of the artificial leather foaming waste gas treatment system according to an embodiment of the present invention;

[0030] Figure 2 It is a partial structural schematic diagram of an artificial leather foaming waste gas treatment system according to an embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of the three-dimensional structure of a spray filtering device of an artificial leather foaming waste gas treatment system according to an embodiment of the present invention;

[0032] Figure 4 It is a cross-sectional view of a spray filtering device of an artificial leather foaming waste gas treatment system according to an embodiment of the present invention;

[0033] Figure 5 AA view of the spray filter device of the artificial leather foaming waste gas treatment system according to an embodiment of the present invention;

[0034] Figure 6 BB view of the spray filtering device of the artificial leather foaming waste gas treatment system according to the embodiment of the present invention;

[0035] Figure 7 Schematic diagram of a water-oil separation partition according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The present invention is further described below with reference to specific embodiments and drawings, but the embodiments do not limit the present invention in any form.

[0037] refer to Figure 1-7 The present invention provides an artificial leather foaming waste gas treatment system, which includes a waste gas collecting device (not shown), a filtering device 1, a cooling device 2, an electrostatic oil fume purification device 3, an exhaust fan 4, and a spray filtering device 5 which are connected in sequence.

[0038] The waste gas collection device is connected to the production line to collect the oven waste gas on the foaming production line.

[0039] The filter device 1 is usually a filter screen, which plays a role of coarse filtering, removes particulate matter and dust in the exhaust gas, and prevents these substances from clogging subsequent processing equipment. For example, a stainless steel filter screen can be used, which can withstand high-temperature flue gas and is easy to process.

[0040] The cooling device 2 is preferably a dry cooling device, which is convenient for controlling the moisture content in the flue gas and is conducive to the parameter adjustment of the subsequent electrostatic fume purification equipment. For example, in a specific embodiment, the cooling device includes a water pump II, a circulating water tank II, a cooling tower and a multi-faceted heat exchange cooler, which circulates heat, but the water and the flue gas do not come into direct contact and no wastewater is generated.

[0041] The electrostatic fume purifier 3 usually includes a discharge zone and an adsorption zone. The flue gas enters the discharge zone after being evenly distributed. The mixed particles such as fume and dust in the gas are charged with negative electrons, negative ions and negative charges, and move toward the positively charged adsorption anode plate under the action of the high-voltage electric field. These captured medium particles gather on the adsorption anode plate under the action of residual static electricity, and flow down along the anode plate by their own weight, fall to the bottom of the electrostatic precipitator, and are discharged through the sewage outlet.

[0042] Spray filter device 5, such as Figure 3-6 As shown, it includes a box body 51, a circulating water tank I 52 arranged below the box body, a water pump I 55 located in the circulating water tank I, and a spray device 54 and a water-oil separation partition 53 arranged in the box body. The spray device 54 is connected to the water pump I 55. Washing liquid is added to the circulating water tank I 52. According to the gas flow direction, the water-oil separation plate 53 and the spray device 54 are arranged in parallel and located behind the spray device 54; in this way, the pollutant components in the spray-adsorbed gas are first sprayed and adsorbed, and then the water and oil are separated, and finally discharged through the exhaust port 55.

[0043] In one embodiment, a float valve is provided in the circulating water tank 1 52. When the liquid level in the water tank drops, the float drops along with the liquid level, and when it drops to a certain position, the valve core opens the valve body, allowing the washing liquid to flow into the water tank to replenish the washing liquid in the water tank.

[0044] After the exhaust gas is purified by the electrostatic oil fume purifier 3, it is blown into the spray filter box 5 by the exhaust fan 4. The exhaust gas and the washing liquid sprayed by the spray device 54 are in full gas-liquid contact. The pollutants in the exhaust gas are absorbed and neutralized by the washing liquid and are absorbed by the washing liquid, thereby removing most of the pollutants in the exhaust gas. The spray device is usually designed to be multi-layered to increase the spray range and washing efficiency.

[0045] About detergent

[0046] Since the main components of artificial leather foaming waste gas include: plasticizers, plasticizer decomposition products (phthalic anhydride, alcohols, esters), and hydrogen chloride produced by the decomposition of PVC resin at high temperature, the washing liquid is alkaline, pH = 8-12, and generally includes surfactants, adsorbents and acid neutralizers.

[0047] Common acid adsorbents include various alkalis, sodium carbonate, sodium hydroxide, adsorbents such as sodium carbonate, calcium carbonate, calcium sulfate, etc.; common choices for surfactants include perchlorate, etc.

[0048] In one embodiment of the present invention, the following schemes are compared:

[0049] Solution 1: The washing liquid consists of 0.05% Perigax-8, 2% sodium sulfate, 1.5% sodium hydroxide, and the balance water, with a pH of 8-12.

[0050] Solution 2: The washing liquid consists of 0.05% Perigax-8, 2% sodium sulfate, 3% sodium carbonate, and the balance water, with a pH of 8-12.

[0051] Scheme 3: The washing solution consists of 0.05% Perigax-8, 3% calcium sulfate, 2% sodium hydroxide, and the balance water, with a pH of 8-12.

[0052] In a confined space, the spray device sprays cleaning liquids of different formulas, collects the pollutant content in the gas before the test spray, and collects the pollutant content in the gas after the test spray. Compare and compare the adsorption effects of different cleaning liquids. The test results are shown in Table 1.

[0053] Table 1 Comparison of the effects of different detergents

[0054]

[0055] Structural design of spray filtration device

[0056] In the embodiment of the present invention, the spray device 54 and the water-oil separation partition 53 change the traditional structural design of upper spraying and lower partition water-oil separation, and are arranged in parallel front and back along the gas delivery direction. After the rising flue gas enters the box, it is first sprayed, adsorbed and sunk, and then needs to rise before entering the water-oil separation partition, rather than the traditional direct spraying and then sinking into the water-oil separation partition. This lengthens the separation path, allowing the fluid micro-groups to continuously mix and collide in space, which helps the pollutants in the exhaust gas to mix more fully with the washing liquid, thereby improving the reaction rate and removal efficiency. The oil pollutants in the exhaust gas will adhere to the surface of the partition due to inertia. As the exhaust gas continues to pass, the oil droplets on the partition will gradually gather into larger oil droplets, and eventually drip to the bottom of the box due to gravity. In addition, some oil pollutants will also form a thin oil film on the surface of the partition, which can further capture and separate the oil pollutants in the exhaust gas.

[0057] In one embodiment of the present invention, the detergent of scheme 1 in the above-mentioned washing liquid experiment is used to compare the following schemes:

[0058] Solution 1: The box body 51 is evenly divided into the first zone, the second zone, the third zone, the fourth zone and the fifth zone in the direction of gas delivery. The air is taken in from the bottom of the first zone, and the exhaust port 55 is provided at the top of the fifth zone. The first zone and the second zone have the same height, which is H1, and the third zone, the fourth zone and the fifth zone have the same height, which is H2. The spray device is arranged on the upper part of the first zone, with 2 levels; the water-oil separation partition 54 is arranged vertically at the junction of each zone alternately up and down; the water-oil separation partition 53 is composed of a number of interlocking open grooves. The cross section of the open groove is arc-shaped, the angle of the arc is 100°, the height of the water-oil separation partition is h, H1:H2=1.5:1, h:H2=1 / 2.

[0059] Solution 2: The box body 51 is evenly divided into the first zone, the second zone, the third zone, the fourth zone and the fifth zone in the direction of gas delivery. The air is taken in from the bottom of the first zone, and the exhaust port 55 is provided at the top of the fifth zone. The first zone and the second zone have the same height, which is H1, and the third zone, the fourth zone and the fifth zone have the same height, which is H2. The spray device is arranged on the upper part of the first zone, with 2 levels; the water-oil separation partition 54 is arranged vertically at the junction of each zone alternately up and down; the water-oil separation partition 53 is composed of a number of interlocking open grooves. The cross section of the open groove is in the shape of an arc, and the angle of the arc is 100°. The height of the water-oil separation partition is h, H1:H2=2:1, h:H2=1 / 2.

[0060] Solution 3: The box body 51 is evenly divided into the first zone, the second zone, the third zone, the fourth zone and the fifth zone along the gas delivery direction. The air is taken in from the bottom of the first zone, and the exhaust port 55 is provided at the top of the fifth zone. The first zone and the second zone have the same height, which is H1, and the third zone, the fourth zone and the fifth zone have the same height, which is H2. The spray device is arranged on the upper part of the first zone, with 2 levels; the water-oil separation baffle 54 is arranged vertically at the junction of each zone alternately up and down; the water-oil separation baffle 53 is composed of a number of interlocking open grooves. The cross section of the open groove is arc-shaped, and the angle of the arc is 100°. The water-oil separation efficiency is higher. The height of the water-oil separation baffle is h, H1:H2=3:1, h:H2=1 / 2.

[0061] Solution 4: The box body 51 is evenly divided into the first zone, the second zone, the third zone, the fourth zone and the fifth zone in the direction of gas delivery. The air is taken in from the bottom of the first zone, and the exhaust port 55 is provided at the top of the fifth zone. The first zone and the second zone have the same height, which is H1, and the third zone, the fourth zone and the fifth zone have the same height, which is H2. The spray device is arranged on the upper part of the first zone, with 2 levels; the water-oil separation partition 54 is arranged vertically at the junction of each zone alternately up and down; the water-oil separation partition 53 is composed of a number of interlocking open grooves. The cross section of the open groove is arc-shaped, and the angle of the arc is 150°. The water-oil separation efficiency is higher. The height of the water-oil separation partition is h, H1:H2=2:1, h:H2=1 / 2.

[0062] Scheme 5: The box body 51 is evenly divided into the first zone, the second zone, the third zone, the fourth zone and the fifth zone in the direction of gas delivery. The air is taken in from the bottom of the first zone, and the exhaust port 55 is provided at the top of the fifth zone. The first zone and the second zone have the same height, which is H1, and the third zone, the fourth zone and the fifth zone have the same height, which is H2. The spray device is arranged on the upper part of the first zone, with 2 levels; the water-oil separation baffle 54 is arranged vertically at the junction of each zone alternately up and down; the water-oil separation baffle 53 is composed of a number of interlocking open grooves. The cross section of the open groove is arc-shaped, and the angle of the arc is 60°. The water-oil separation efficiency is higher. The height of the water-oil separation baffle is h, H1:H2=2:1, h:H2=1 / 2.

[0063] The gas particulate matter and pollutant content at the exhaust port 55 were detected respectively, and the capture effects of different schemes were compared. The results are shown in Table 3.

[0064] Table 2 Comparison of exhaust gas after spray filtration in different schemes

[0065]

[0066] In summary, it can be seen that when H1:H2=1.5~2:1, h:H2=1 / 2, and the angle of the cross-sectional arc of the opening groove of the water-oil separation partition is about 100°, the effect is better.

[0067] In addition, for safety reasons, the treatment system of the present invention is further provided with a fire damper 6 between the filter device 1 and the exhaust gas collection device, and between the electrostatic fume purification equipment and the exhaust fan.

[0068] Reference Figure 1 The artificial leather foaming waste gas treatment system of the present invention comprises the following steps when treating artificial leather foaming waste gas:

[0069] S1 uses the waste gas collection device to collect the waste gas from the foaming production line and enters the air pipe;

[0070] S2 removes particles from the exhaust gas by preliminary filtration through the filter device 1;

[0071] S3 uses a dry cooling device 2 to reduce the gas temperature to ≤40°C. Preferably, in step S3, the gas temperature is reduced to 30-40°C. This can not only condense and aggregate the pollutants in the flue gas into oil fume particles of suitable particle size, which are convenient for electrostatic adsorption, but also ensure that there is a suitable water vapor content in the oil fume exhaust gas, thereby ensuring the normal operation of the electrostatic oil fume removal equipment and high adsorption efficiency.

[0072] S4 uses an electrostatic adsorption device 3 to remove particulate matter in the gas after cooling;

[0073] The S5 gas is blown into the spray filter box 5 by the exhaust fan 4, and firstly comes into full gas-liquid two-phase contact with the washing liquid sprayed by the spray device 54, and the gaseous pollutants in the exhaust gas undergo absorption and neutralization reaction with the washing liquid and are absorbed by the washing liquid. Then, the exhaust gas after spray washing passes through the water-oil separation partition 53 for water-oil separation.

[0074] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An artificial leather foaming waste gas treatment system, characterized in that: The system comprises, in sequence, an exhaust gas collecting device, a filtering device (1), a cooling device (2), an electrostatic fume purification device (3), an exhaust fan (4), and a spray filtering device (5) which are connected to each other; The filtering device (1) is a filtering net; The cooling device (2) is a dry cooling device; The spray filter box (5) comprises a box body (51), a circulating water tank I (52) arranged below the box body, a water pump I (56) located in the circulating water tank I, and a spray device (54) and a water-oil separation baffle (53) arranged in the box body, wherein the spray device (54) is connected to the water pump I (56), washing liquid is added to the circulating water tank I (52), and the spray device (54) and the water-oil separation baffle (53) are arranged in parallel front and back along the gas conveying direction.

2. The exhaust gas treatment system according to claim 1, characterized in that: The washing liquid is composed of 0.02% to 0.1% of peregrin, 1% to 5% of sodium sulfate, 1% to 2% of sodium hydroxide, and the balance of water, according to weight percentage, and the pH value is 8-12.

3. The exhaust gas treatment system according to claim 1, characterized in that: The box body (51) is evenly divided into a first zone, a second zone, a third zone, a fourth zone and a fifth zone in sequence along the gas delivery direction. Gas is introduced from the bottom of the first zone and exhausted from the top of the fifth zone. The first zone and the second zone have the same height, which is H1. The third zone, the fourth zone and the fifth zone have the same height, which is H2. H1>H2. The spray device (54) is arranged at the upper part of the first zone and has multi-stage spraying; The water-oil separation baffles (53) are vertically arranged at the junctions of the zones in an alternating manner up and down; the water-oil separation baffles are composed of a plurality of open grooves that are interlocked.

4. The exhaust gas treatment system according to claim 3, characterized in that: The cross section of the opening groove is in an arc shape, and the angle of the arc is 80-120°.

5. The exhaust gas treatment system according to claim 3, characterized in that: The height of the water-oil separation partition (53) is h, H1:H2=1.5-2:1, h:H2=1 / 2-1 / 3:

1.

6. The exhaust gas treatment system according to claim 1, characterized in that: The cooling device (2) comprises a water pump II, a circulating water tank II, a cooling tower and a multi-faceted tube heat exchange type cooler.

7. The exhaust gas treatment system according to claim 1, characterized in that: The filtering device (1) is a metal filtering screen.

8. The exhaust gas treatment system according to claim 1, characterized in that: A fire damper (6) is also provided between the filtering device and the waste gas collecting device, and between the electrostatic oil fume purification equipment and the exhaust fan.

9. A method for treating artificial leather foaming waste gas using the treatment system according to any one of claims 1 to 8, characterized in that: Includes steps: S1 uses waste gas collection device to collect waste gas from foaming production line. S2 removes particles from the exhaust gas by preliminary filtering through a filter device (1); S3 uses a cooling device (2) to reduce the gas temperature to ≤40°C; S4 uses an electrostatic adsorption device (3) to remove particulate matter from the gas after cooling; The S5 gas enters the spray filter box (5) and first comes into full gas-liquid two-phase contact with the washing liquid sprayed from the spray device (54). The gaseous pollutants in the waste gas undergo an absorption and neutralization reaction with the washing liquid and are absorbed by the washing liquid. Then, the waste gas after spray washing passes through the water-oil separation partition (53) for water-oil separation.

10. The processing method according to claim 9, characterized in that: In step S3, the gas temperature is lowered to 30-40°C.

Images