TWI604883B - Organic waste gas pretreatment purification system and organic waste gas purification method of coating operation - Google Patents

Description

Organic waste gas pretreatment purification system for coating operation and organic waste gas purification method

The present invention relates to an organic waste gas pretreatment purification system and an organic waste gas purification method for a coating operation, which are systems and methods for purifying organic waste gas generated in a painting operation.

The coatings/paints engineering system is widely used in various industries and products. The main functions can increase the appearance, product function or protection. The coating method includes spraying method and coating method: spraying The system sprays the paint onto the surface of the object by means of a spray gun, usually applied to metal surface coating processes (such as automotive sheet metal), etc.; the coating method is applied to functional fabrics, tapes, label papers, stickers, and poly Amine film...etc. related functional products.

In general, the coating process can be weather-resistant, heat-insulating, insulating and rust-proof, moisture-proof, acid-base and so on, in order to beautify, decorate the appearance of the product, and at the same time provide protection against scratches on the surface of the coated object. , rust and other effects, thereby extending the service life, so that even the product value of the object itself can be improved. Based on the above characteristics and advantages, painting engineering is widely used in construction engineering, transportation equipment, electronic products, people's livelihood products, national defense industry, machinery, furniture, plastics and metal products, etc., and has become an important part of the chemical industry.

Wherein, the coating used in the coating process is a material used to protect the surface of the object to be coated or to change the appearance, and is applied to the surface of the object in a flowing state to form a film, after a period of time, After the solvent in the coating is completely volatilized, a continuous solid film is fixedly coated on the surface thereof, and the flow state includes liquid, molten, airborne particles and the like.

The coating is composed of a color developing agent (mostly resin and cellulose), a pigment, a solvent (to dissolve the color developing agent), and various additives such as a plasticizer and a hardener. Therefore, the coating itself has an organic Solvents are present (except for waterborne coatings and powder coatings); in addition, a specific organic solvent diluent may be added as needed to improve the coating characteristics of the coating before degreasing and cleaning of the pipeline before coating. Organic solvents are also often used, and the inseparable relationship between coating and solvent is also evident in the importance of the role of organic solvents.

Depending on the type and characteristics of the coating and the coating, in the painting operation, after the coating process (such as spraying method or coating method), the coating process will continue with a drying process, and the coating process will be The coating is applied to the surface of the object to be coated, and the object to be coated is dried in a drying process at a high temperature through a drying chamber. Among them, the organic solvents used in the coating process are mostly low boiling point and high volatility, so it is very easy to spray and rotten or volatilize in the baking process. Most organic solvents have lower boiling points and coating composition. The organic solvent is extremely volatile, forming so-called Volatile Organic Compounds (VOCs). At the same time, in the coating process, the spraying and splashing of the paint causes a large amount of paint particles (granules with a particle size larger than 2.5 μm; >> PM2.5) to be generated in the spray booth, and the exhaust gas is easily volatilized at normal temperature. Low boiling point and low concentration VOCs are dominant. In the drying process, the VOCs exhaust gas discharged from the drying chamber belongs to high-temperature exhaust gas (exhaust gas temperature is 100~150°C), and the exhaust gas contains high-boiling and high-concentration VOCs which are volatilized at high temperature, and the exhaust gas is mainly used. High-boiling VOCs are cooled by condensation with the exhaust line to form submicron particles (micro-mist droplets; << PM2.5).

Therefore, since VOCs have toxicities of varying degrees and participate in photochemical reactions, the environmental impact of the exhaust gas generated by the coating operation has been paid more and more attention. The exhaust gas generated by the painting operation must be purified and meet the emission standards. The purified exhaust gas can be discharged to the atmosphere.

As shown in FIG. 1, it is a schematic diagram of an organic exhaust gas purification system applied to a coating operation in the prior art. The conventional organic exhaust gas purification system mainly comprises a windmill 101, a washing tower 102, a runner device 103 and a discharge chimney 104. The coating process in the painting operation and the exhaust gas generated in the drying process are collected and then taken out to the washing tower by the windmill 101. 102 is washed to reduce the lacquer content, and the washed exhaust gas is introduced into the suction and desorption unit of the reel device 103, and the volatile VOCs in the exhaust gas are adsorbed by the suction and desorption unit in the reel. However, the general coating industry has an exhaust gas inlet concentration of about 200-600 mg/M ³ , which further contains 5-15% naphtha component, 5% trimethylbenzene, and 5% o-xylene, etc., which are high boiling points. Non-water-soluble VOCs, high-boiling VOCs are easily condensed and clog on the porous adsorbent of the zeolite reel, activated carbon fluidized bed, etc., such as the suction and desorption unit (such as the runner device 103), thus causing suction The efficiency of the desorption unit is gradually reduced; in addition, the reel unit 103 absorbs and desorbs the unit (for example, sorghum-aluminum ratio hydrophobic ZSM-5 or/and Y-type zeolite; UOP Hisiv 3000 or/and Hisiv 1000) for molecular diameter comparison Large high-boiling, water-insoluble VOCs have extremely low adsorption efficiencies (<20%). For the above data example, VOCs that cannot be adsorbed by the reel unit 103 are estimated to be 15-25%, resulting in other The processing efficiency of the types of VOCs must be as high as 99% or more, and the equipment and operating costs must be increased. For example, a suction and desorption unit such as a series of rotating equipments can be added for re-purification to achieve 99% processing efficiency (efficiency calculation formula). As follows: 90% + (100% - 90%) x 90% = 99%) in order to meet environmental emission regulations.

In addition, in order to make the coating applied to the surface of the coated object uniform in coating, stable in thickness, etc., and in the drying process, the quality of the dried object to be coated is stable, and the coating room and the drying room must have relative Stable temperature and humidity, wind speed and airflow cleanliness environment, therefore, the coating process and drying process On the gas pipeline, the granularity, temperature, humidity, steady intake air volume, wind speed (regulation), and volatile organic matter (VOCs or THC) concentration in the influent gas must be adjusted to ensure quality and safe operation. In winter (especially in cold regions) or in summer (especially in subtropical or tropical regions), the energy consumption required for cooling or/and heating is greatly increased, and the burden on the final end-of-pipe treatment equipment is also increased.

An object of the present invention is to solve the problems of the conventional exhaust gas purification treatment technology produced by the coating operation, in which the high molecular weight, high boiling point, VOCs are easily condensed, blocked on the runner, and the adsorption and desorption purification efficiency is not good.

Another object of the present invention is to solve the conventional exhaust gas purification treatment technology for the coating operation, in which the characteristics of the two exhaust gases of the coating process and the drying process are different but combined, thereby requiring a plurality of pre-filtration treatment modes and Problems with high setup and operating costs.

Another object of the present invention is to solve the conventional exhaust gas purification treatment technology generated by the coating operation, in which the coating process requires a large amount of cooling or/and heating of the intake air, and the intake air must have stable temperature and humidity and wind speed. Controls such as safe concentration, which leads to problems such as high energy consumption and operating costs.

A further object of the present invention is to solve the conventional exhaust gas purification treatment technology for coating work, in which the exhaust gas of the coating process belongs to a low temperature and a large air volume at a normal temperature, resulting in high installation and operation cost of the pipe end line and the processing equipment. problem.

To achieve the above and other objects, the present invention discloses an organic waste gas pretreatment purification system for a coating operation for treating a first exhaust gas generated by a coating process and a second exhaust gas generated by a drying process, the organic exhaust gas pre- The treatment purification system comprises a first bleed air line, a second bleed air line, and an increase a wet condensing unit and a bus line, wherein the first bleed air line leads to the first exhaust gas generated by the painting process; the second bleed air line leads to the second exhaust gas generated by the drying process; the humidifying condensing unit Is disposed on the second bleed air line, the humidification condensing unit includes a humidification device and a condensation chamber to cause the second exhaust gas to be washed and humidified and condensed; the confluence line is connected to the first bleed air line And the second bleed air line for the first exhaust gas and the second exhaust gas to merge.

The organic waste gas pretreatment purification system further includes a first filter unit disposed on the first air induction line for filtering the particulate matter in the first exhaust gas.

The organic waste gas pretreatment purification system described above further comprises a second filtering unit disposed on the confluence line for filtering the particulate matter in the confluent exhaust gas.

The organic waste gas pretreatment purification system, further comprising a reflux bleed line, the upstream of the return priming line connecting the first bleed line and the junction line or before, to the first bleed line All or part of the exhaust gas is drawn back to the inlet duct of at least one of the painting process and the drying process.

The organic waste gas pretreatment purification system further includes a third filter unit disposed on the reflux bleed line for filtering particulate matter in the gas passing through the reflux bleed line.

The organic waste gas pretreatment purification system further includes an organic substance concentration monitor, wherein the organic substance concentration monitor is disposed on the return air inlet pipe, the air inlet pipe of the painting process, and at least the air inlet pipe of the drying process In one of them, it is used to monitor the concentration of organic matter in the tube.

The organic waste gas pretreatment purification system further includes a first air conditioning unit, wherein the first air conditioning unit is disposed on the air inlet pipe of the painting process for adjusting the grain of the gas in the air inlet pipe. At least one of a shape, a temperature, a humidity, an intake air volume, and an intake air speed.

The organic waste gas pretreatment purification system further includes a second air conditioning unit, the second air conditioning unit is disposed on the air inlet pipe of the drying process, and is used for adjusting the grain of the gas in the air inlet pipe. At least one of a shape, a temperature, a humidity, an intake air volume, and an intake air speed.

The organic waste gas pretreatment purification system described above further comprises a temperature control wet unit connected to the flow line and used to directly or indirectly heat the combined exhaust gas in the flow line.

The above organic waste gas pretreatment purification system, wherein the humidification condensing unit has a defogger, and the demister is disposed downstream of the condensation chamber.

The above organic waste gas pretreatment purification system, wherein the condensation chamber has a condenser.

The organic waste gas pretreatment purification system described above, wherein the humidification liquid provided by the humidification device has a temperature equal to or lower than a dew point temperature of the second exhaust gas.

The above organic waste gas pretreatment purification system, wherein the condensation chamber has a porous layer.

In order to achieve the above and other objects, the present invention further discloses a method for purifying an organic waste gas for a coating operation, which is used for treating a first exhaust gas generated by a coating process in a painting operation and a second exhaust gas generated by a drying process, The organic waste gas purification method comprises: a humidification condensation step of humidifying and condensing the second exhaust gas generated by the drying process; and a confluence step, humidifying and condensing The second exhaust gas and the first exhaust gas generated by the coating process are confluent exhaust gas, and the confluent exhaust gas is introduced into a final tube end processing device for purification treatment.

In the above method for purifying an organic waste gas, in the confluent step, the first exhaust gas generated by the coating process is first filtered by the granular material, and then merged with the second exhaust gas after being humidified and condensed.

The organic waste gas purification method further includes a reflux bleed step, and the filtered first exhaust gas is drawn back to the inlet end of the coating process and the drying process through a reflux bleed line. At least one of the wind inlets.

In the above method for purifying an organic waste gas, in the reflux bleed air step, a third filter unit is disposed on the reflux bleed line for filtering particulate matter in the gas.

The organic waste gas purification method further includes an organic concentration monitoring step, wherein an organic concentration monitor is disposed on at least one of the return air inlet pipe, the air inlet pipe of the painting process, and the air inlet pipe of the drying process Used to monitor the concentration of organic matter in the tube.

The above method for purifying an organic waste gas, further comprising an air conditioning step, wherein at least one of an air inlet end of the coating process and an air inlet end of the drying process is provided with an air conditioning unit to adjust a gas for processing the inlet end At least one of granules, temperature, humidity, intake air volume, and intake air speed.

The organic waste gas purification method described above, wherein the confluent exhaust gas is heated to increase the temperature of the confluent exhaust gas to 20-40 ° C and the humidity is reduced to below 80% RH, and then enter the final tube end treatment device.

The above organic waste gas purification method, wherein the final tube end treatment device is a zeolite concentration runner, an activated carbon fluidized bed, an adsorption tower or an incinerator.

According to the above, in the organic waste gas pretreatment purification system and the organic waste gas purification method of the coating operation, the first exhaust gas generated by the coating process and the second exhaust gas generated by the drying process are subjected to a split pretreatment to target The first exhaust gas with different characteristics (the volatile low-boiling VOCs and the lacquer particles account for the majority) and the second exhaust gas (the high-boiling VOCs and the sub-micron aerosols account for the majority) are pre-treated separately, which not only reduces the final tube treatment. The burden of the equipment can also reduce the maintenance frequency of the final tube processing equipment, and also greatly improve the processing efficiency of VOCs in the exhaust gas.

1‧‧‧Organic exhaust gas pretreatment purification system

10‧‧‧First gas line

11‧‧‧Into the air duct

20‧‧‧Second bleed line

21‧‧‧Into the air duct

30‧‧‧Humidification condensing unit

31‧‧‧ humidification device

311‧‧‧liquid supply pipeline

312‧‧‧ 帮浦

313‧‧‧ cooler

32‧‧‧Condensing room

33‧‧‧ defogger

321‧‧‧Porous layer

322‧‧‧Condenser

40‧‧‧Confluence pipeline

50A‧‧‧First Filter Unit

50B‧‧‧Second filter unit

50C‧‧‧ third filter unit

60A‧‧‧First air conditioning unit

60B‧‧‧Second air conditioning unit

70‧‧‧Final tube processing equipment

80,80’‧‧‧Return temperature control unit

81‧‧‧Return heat exchanger

82‧‧‧Drainage pipeline

82a‧‧‧Extraction

82b‧‧‧Return pipe

83‧‧‧Circular windmill

84‧‧‧High temperature side pipeline

84a‧‧‧First pipeline

84b‧‧‧Second pipeline

85‧‧‧First heating line

86‧‧‧Second heating line

90‧‧‧Return bleed line

91‧‧‧Connecting pipe

92‧‧‧Connecting tube

93‧‧‧Returning windmill

95A, 95B, 95C, 95D‧‧‧ Organic Concentration Monitor

[Fig. 1] is a schematic view of an organic exhaust gas purifying system applied to a coating operation in the prior art.

2 is a schematic view of an organic waste gas pretreatment purification system according to a first embodiment of the present invention.

[Fig. 3] is a schematic flow chart of the painting operation.

4A and 4B are graphs showing the particle mass distribution of the first exhaust gas generated by the coating process and the second exhaust gas sampling detected by the drying process in the same painting operation in the first embodiment of the present invention.

5A and 5B are structural schematic views of an exemplary embodiment of a humidification condensing unit.

Fig. 6 is a schematic view showing an organic waste gas pretreatment purification system according to a second embodiment of the present invention.

Fig. 7 is a schematic view showing an organic waste gas pretreatment purification system according to a third embodiment of the present invention.

Fig. 8 is a schematic view showing an organic waste gas pretreatment purification system according to a fourth embodiment of the present invention.

Fig. 9 is a schematic view showing an organic waste gas pretreatment purification system according to a fifth embodiment of the present invention.

In order to fully understand the objects, features and advantages of the present invention, the present invention will be described in detail by the following specific embodiments and the accompanying drawings.

Referring to FIG. 2, the organic waste gas pretreatment purification system 1 of the first embodiment of the present invention is used for processing a first exhaust gas generated by a coating process in a painting operation and a second exhaust gas generated by a drying process, the organic exhaust gas pre- The treatment purification system 1 includes a first primer line 10, a second primer line 20, a humidification condensing unit 30, and a confluence line 40, and the first air introduction line 10 leads out the first exhaust gas generated by the painting process; The second bleed air line 20 leads to the second exhaust gas generated by the drying process; the humidification condensing unit 30 is disposed on the second bleed air line 10, and the humidification condensing unit 30 includes a humidification device 31 and a condensation chamber. 32, so that the second exhaust gas is washed and humidified and condensed; the bus line 40 is connected to the first air entraining line 10 and the second air guiding line 20 for the first exhaust gas and the second exhaust gas to flow, And a confluent exhaust gas is formed. The rear end of the bus line 40 can be connected to a final tube end processing device 70 to purify the confluent exhaust gas, thereby reducing the VOCs content therein.

Preferably, the organic waste gas pretreatment purification system 1 can include a first filter unit 50 disposed on the first air separation line 10 for filtering particles in the first exhaust gas. The granules of the first exhaust gas are filtered out first, thereby relieving the burden of subsequent equipment processing.

In the first embodiment of the present invention, the organic waste gas pretreatment purification system 1 is used for processing the first exhaust gas generated by the coating process in the painting operation and the second exhaust gas generated by the drying process, as shown in FIG. The loading operation mainly includes a coating process and a drying process. The coating process is applied to the coating chamber to apply the coating to the surface of the object to be coated, and the object to be coated is dried in the drying process at a high temperature to dry the object. Wherein, the drying process is continued after the painting process, or there are other processes between the drying process and the painting process.

Referring to FIG. 4A and FIG. 4B together, it is a particle mass distribution curve of the first exhaust gas A generated by the coating process and the second exhaust gas B sampled by the drying process in the same painting operation.

As shown in FIG. 4A, the concentration of the particles in the first exhaust gas A is concentrated in the interval of 10 to 18 μm, which means that the particle size of the first exhaust gas A is mainly distributed over 10 μm; further analyzing the characteristics of the first exhaust gas A, Since the coating process is to spray the paint at normal temperature, the first exhaust gas A is composed of lower boiling VOCs (such as toluene, xylene, methyl ethyl ketone, cyclohexanone, etc.) which are volatile at normal temperature, and paint granules (2.5). Particles above μm are paint particles) and very small amounts of high boiling VOCs.

As shown in FIG. 4B, the concentration of the particles in the second exhaust gas B is concentrated in the range of 0.1 to 0.18 μm, and most of them are submicron particles having a particle diameter of about 0.3 μm; further analyzing the characteristics of the second exhaust gas B due to The drying process is carried out at a high temperature of 150 to 200 ° C, so that the high boiling VOCs in the coating are evaporated, so the second exhaust gas B is composed of high boiling VOCs having a boiling point of about 160 ° C or higher (for example, trimethylbenzene, C _{7 ).} ~C ₁₂ naphtha, plasticizer, DIMP, DOP and other macromolecular VOCs) and a small amount of medium and low boiling VOCs. In addition, the second exhaust gas B also contains a temperature drop from the drying chamber. Fine suspended particles of submicron (particle size 0.1~1μm).

Therefore, in the above embodiment, a method for purifying an organic waste gas using a coating operation is provided, which comprises a humidification condensation step and a confluence step: the humidification condensation step is to humidify and condense the drying process. Producing a second exhaust gas, and causing the second exhaust gas generated by the drying process to be evaporatively cooled and condensed by washing and humidifying, so that most of the high boiling VOCs in the second exhaust gas are absorbed and intercepted In the confluence step, the second exhaust gas after humidification and condensation is merged with the first exhaust gas generated by the coating process as a confluent exhaust gas, and the confluent exhaust gas is introduced into the final tube end processing device 70 for purification treatment. Please return to FIG. 2, the second exhaust gas generated by the drying process is passed through the second air guiding pipeline. 20 is taken out and humidified and condensed by the humidification condensing unit 30. In the humidification condensing unit 30, the humidifying device 31 sprays a humidifying liquid to humidify the second exhaust gas, and the second exhaust gas is in the condensation. In the chamber 32, the water vapor is saturated or supersaturated due to low temperature, thereby causing the second exhaust gas to generate saturated or supersaturated condensation and nucleation growth, wherein the larger molecules and the condensed high boiling VOCs and the submicron (particle size 0.1~1 μm) The fine aerosols are trapped or/or absorbed by the formed droplets or liquid film, and the content of VOCs and fine aerosols in the second exhaust gas is greatly reduced. On the other hand, the first exhaust gas generated by the coating process is first subjected to the particulate filtering treatment by the first filtering unit 50, and then merged with the second exhaust gas after being humidified and condensed in the confluence line 40. Forming a confluent exhaust gas.

In the present embodiment, the final tube end processing apparatus 70 is exemplified by a zeolite concentration reel, which is not limited thereto, and the final tube end processing apparatus 70 may also be, for example, an activated carbon fluidized bed, an adsorption tower, an incinerator or The other organic waste gas purification treatment device may further comprise a system composed of at least two of a zeolite concentration runner, an activated carbon fluidized bed, an adsorption tower, and an incinerator.

In this embodiment, the organic waste gas pretreatment purification system 1 may further include a second filtering unit 60 disposed on the confluence line 40 for filtering the particulate matter in the confluent exhaust gas. The particulate matter in the confluent exhaust gas is further removed by filtration to avoid excessive content of the particulate matter in the confluent exhaust gas to block the final tube end processing apparatus 70.

In this embodiment, the humidification condensing unit 30 may have a defogger 33 disposed downstream of the condensing chamber 32 for intercepting condensation condensed droplets in the second exhaust gas (humidifying liquid/ Washing liquid), micro mist or particles.

Referring to FIG. 5A, which is a schematic structural view of an exemplary embodiment of the humidification condensing unit 30 in the embodiment, wherein the second exhaust gas is introduced from the bottom of the humidification condensing unit 30. And is discharged from the top outlet of the humidification condensing unit 30, and the temperature of the humidifying liquid provided by the humidifying device 31 is equal to or lower than the dew point temperature of the second exhaust gas. For example, the humidifying device 31 The system can have a liquid supply line 311, a pump 312, and a cooler 313. The second exhaust gas is washed by the humidifying liquid provided by the humidifying device 31 to cause the granular material and the like contained therein to be washed and intercepted. The cooler 313 cools the temperature of the humidifying liquid to be equal to or lower than the dew point temperature of the second exhaust gas, and the humidifying liquid drops downward through the condensation chamber 32 at a low temperature. The condensing chamber 32 may have a porous layer 321 which may be a layered structure having a plurality of pores so that the humidifying liquid temporarily stays in the porous layer 321 and passes through The exhaust gas undergoes heat exchange, and the humidification liquid encounters the second exhaust gas system to generate evaporative cooling, so that the second exhaust gas is condensed to generate a nuclear condensation reaction, and further, the VOCs in the second exhaust gas are in the humidification and condensation unit 30 was absorbed and intercepted.

In this embodiment, the humidifying liquid dropped from the top to the bottom can be recovered and cyclically sprayed through the liquid supply line 311.

However, the humidification condensing unit 30 of the present invention is not limited to the above structure, and any structural configuration in which the second exhaust gas can be humidified and condensed is within the scope of the present invention. For example, please refer to FIG. 5B , which is a structural schematic diagram of another exemplary embodiment of the humidification condensing unit 30 ′ in the embodiment. The condensation chamber 32 ′ may have a condenser 322 therein. The condenser 322 is, for example, a coil having a cooling water circulation such that the ambient temperature of the condensation chamber 32 is lower than the dew point temperature of the second exhaust gas, thereby condensing the second exhaust gas passing through the condensation chamber 32.

Please refer to FIG. 6, which is a schematic diagram of a second embodiment of the present invention. The organic waste gas pretreatment purification system may include a temperature control wet unit 80 connected to the flow line 40 and used to indirectly heat the combined exhaust gas in the flow line 40. For example, the temperature-controlled humidity unit 80 can include a temperature-return heat exchanger 81, a drain line 82, and a circulation windmill 83. The line 82 has a lead-out pipe 82a and a return pipe 82b connectable to the inlet of the final pipe end treatment apparatus 70 to draw a part of the confluent exhaust gas in the bus line 40 to the return temperature. The heat exchanger 81 performs heat exchange, and the warmed exhaust gas is returned to the flow line 40 via the return pipe 82b, so that the combined exhaust gas is heated before entering the final pipe end treatment device 70, so that the exhaust gas is exhausted. The temperature is raised to 20-40 ° C and the relative humidity is reduced to below 80% RH, which is beneficial to the adsorption capacity of the VOCs in the exhaust gas in the final tube processing equipment 70, thereby improving the removal efficiency of VOCs in the exhaust gas.

Preferably, the high temperature side of the temperature recovery heat exchanger 81 can be a high temperature gas drawn from the incinerator 90. For example, the temperature control humidity unit 80 can include a high temperature side line 84. The 84 series includes a connected first line 84a and a second line 84b. The first line 84a is connected to the incinerator 90 for extracting the high temperature gas of the incinerator 90 to the second line 84b. The second line 84b is It is connected to the regenerative heat exchanger 81 to heat the confluent exhaust gas in the drain line 82.

In addition, the final tube processing device 70 may have a temperature sensor (not shown) at the inlet for monitoring the temperature of the confluent exhaust gas before entering the final tube processing device 70. The circulating windmill 83 determines the flow rate of the pumping according to the temperature measured by the temperature sensor.

As shown in FIG. 6, in the organic waste gas purification method used in the second embodiment of the present invention, the confluent exhaust gas in the confluence line 40 is heated by indirect heat exchange with the high temperature gas, so that the temperature of the confluent exhaust gas is raised to 20 -40 ° C and the humidity is reduced to below 80% RH, and then enter the final tube end treatment equipment to allow the confluent exhaust gas to enter the final tube end treatment device 70, so that the confluent exhaust gas temperature rises and the relative humidity decreases, and the Finally, the end-of-pipe processing equipment 70 adsorbs the VOCs, thereby increasing the removal efficiency of the VOCs in the exhaust gas.

Please refer to FIG. 7, which is a schematic diagram of a third embodiment of the present invention. The difference from the second embodiment is that the temperature-controlled humidity unit 80' is connected to the bus line 40 and is used to directly heat the sink. The confluent exhaust gas in the flow line 40. For example, the temperature control unit 80' includes a first heating line 85 and a second heating line 86. The first heating line 85 is connected to the combustion chamber of the incinerator 90. The second heating line 86 The outlet line of the incinerator 90 is connected, so that the high temperature gas in the combustion chamber of the incinerator 90 and the high temperature gas incinerated by the incinerator 90 are taken out to the confluence line 40, thereby heating the confluent exhaust gas.

The first heating line 85 and the second heating line 86 each have a valve assembly (not shown) to control the flow rate of the high temperature gas. In addition, similar to the second embodiment, the final tube processing device 70 may also have a temperature sensor (not shown) at the inlet, and the temperature sensor is used to monitor the flow of the exhaust gas into the final tube end. The temperature of the front of the processing device 70, the valve assembly of the first heating line 85 and the second heating line 86 can determine the flow rate of the high temperature gas passing through the temperature measured by the temperature sensor.

As shown in FIG. 7, in the organic waste gas purification method used in the third embodiment of the present invention, the confluent exhaust gas in the confluence line 40 is heated by directly mixing the high-temperature gas, so that the temperature of the confluent exhaust gas is raised to 20-40. °C and the humidity is reduced to below 80% RH, and then enter the final tube end treatment device 70, so that the confluent exhaust gas temperature rises and the relative humidity decreases before the confluent exhaust gas enters the final tube end treatment device 70, and the final temperature can be increased. The end-of-pipe processing equipment 70 adsorbs VOCs, thereby increasing the removal efficiency of VOCs in the exhaust gas.

In this embodiment, the clean exhaust gas after the final tube processing apparatus 70 is purified may be directly discharged to the atmosphere of the exhaust stack or/and returned to the coating process or the inlet end of the drying process.

Please refer to FIG. 8, which is a schematic diagram of a fourth embodiment of the present invention. The organic waste gas pretreatment purification system further includes a reflux bleed air line 90, the upstream of which is connected to the first bleed air line 10 and the junction of the first bleed air line 10 to the first bleed air Exhaust gas from line 10 All or part of the inlet ducts 11, 21 are returned to the coating process and at least one of the drying processes. As shown in FIG. 8, a recirculating air flow line 90 is disposed on the return air introducing line 90, and a connecting pipe 91 is connected to the air inlet end 11 of the painting process, and a connecting pipe 92 is connected to the air inlet end 21 of the drying process. According to this, the recirculated windmill 93 is pumped back to the air inlet end 11 of the painting process and/or the air inlet end 21 of the drying process by the first exhaust gas filtered by the first filtering unit 50A, and The coating process and/or the intake of the drying process.

The organic waste gas pretreatment purification system may further comprise an organic matter concentration monitor 95A, 95B, 95C, 95D, which may be disposed on the return air inlet pipe, the air inlet pipe of the painting process, and the drying process. At least one of the ducts is configured to perform an organic concentration monitoring step for monitoring the concentration of organic matter in the tubes (eg, VOCs or THC).

The organic waste gas purification method used in the fourth embodiment of the present invention comprises a reflux bleed step, and the filtered first exhaust gas is drawn back to the coating process through the reflux bleed air line 90. At least one of the wind end 11 and the air inlet end 21 of the drying process is recycled for use as the air intake end of the coating process or/and the air inlet end of the drying process, thereby reducing the process intake air temperature control The energy consumption of moisture control and the burden of reducing the end gas purification process.

Please refer to FIG. 9, which is a schematic diagram of a fifth embodiment of the present invention. The organic waste gas pretreatment purification system further includes a third filter unit 50C, and the third filter unit 50C is disposed on the reflux bleed line 90 for filtering the granularity in the gas passing through the return priming line 90. Things.

The organic waste gas pretreatment purification system may further include a first air conditioning unit 60A, and the first air conditioning unit 60A is disposed on the air inlet pipe 11 of the painting process for adjusting and processing the air inlet pipe 11 At least one of gas granules, temperature, humidity, intake air volume, and intake air velocity To perform an air conditioning step, thereby achieving the purpose of temperature control and humidity control for the air intake filter, thereby improving process stability and product yield.

The organic waste gas pretreatment purification system may further include a second air conditioning unit 60B, and the second air conditioning unit 60B is disposed on the air inlet pipe 21 of the drying process for adjusting and processing the gas in the air inlet pipe 21. At least one of a granularity, a temperature, a humidity, an intake air volume, and an intake air velocity to perform an air conditioning step, thereby achieving the purpose of temperature control and humidity control for the air intake filter, thereby improving process stability and product yield .

In this embodiment, the first air conditioning unit 60A and the second air conditioning unit 60B can be, for example, an air intake control temperature control air conditioning unit (Make-up Air Handling Unit) or other device that can achieve the same function. combination.

Accordingly, in the above embodiment of the present invention, the first exhaust gas generated by the coating process and the second exhaust gas generated by the drying process are subjected to split pretreatment to target the first exhaust gas with different characteristics (low boiling point of volatilization) VOCs and paint particles account for the majority of the second exhaust gas (high-boiling VOCs and sub-micron aerosols), and the use of partial exhaust gas recirculation for reuse, not only reduces the process inlet end The burden of the air conditioning equipment and the final tube end processing equipment can also reduce the maintenance frequency and safe operation of the final tube end processing equipment, and also greatly improve the processing efficiency of VOCs in the exhaust gas.

The invention has been described above in terms of the preferred embodiments, and it should be understood by those skilled in the art that the present invention is not intended to limit the scope of the invention. It should be noted that variations and permutations equivalent to those of the embodiments are intended to be included within the scope of the present invention. Therefore, the scope of protection of the present invention is defined by the scope of the patent application.

1‧‧‧Organic exhaust gas pretreatment purification system

10‧‧‧First gas line

20‧‧‧Second bleed line

30‧‧‧Humidification condensing unit

31‧‧‧ humidification device

32‧‧‧Condensing room

33‧‧‧ defogger

40‧‧‧Confluence pipeline

50A‧‧‧First Filter Unit

50B‧‧‧Second filter unit

70‧‧‧Final tube processing equipment

Claims (20)

An organic waste gas pretreatment purification system for painting operation, which is used for processing a first exhaust gas generated by a coating process in a painting operation and a second exhaust gas generated by a drying process, the organic exhaust gas pretreatment purification system comprising: The bleed air line leads to the first exhaust gas generated by the painting process; the second bleed air line leads to the second exhaust gas generated by the drying process; the humidification condensing unit is disposed on the second bleed air line, and the increase The wet condensing unit includes a humidifying device and a condensation chamber to cause the second exhaust gas to be washed and humidified and condensed; and a confluence line connecting the first bleed air line and the second bleed air line for the first An exhaust gas and the second exhaust gas merge. The organic waste gas pretreatment purification system according to claim 1, further comprising a first filtering unit disposed on the first bleed air line for filtering the granules in the first exhaust gas . The organic waste gas pretreatment purification system according to claim 2, further comprising a second filtering unit disposed on the confluence line for filtering the particulate matter in the confluent exhaust gas. The organic waste gas pretreatment purification system of claim 2, further comprising a reflux bleed line, the upstream of the return bleed line connecting the first bleed line to the junction of the first bleed line or the front to All or part of the exhaust gas of the first bleed air line is drawn back to the air inlet pipe of at least one of the painting process and the drying process. The organic waste gas pretreatment purification system according to claim 4, further comprising a third filter unit disposed on the reflux bleed line for filtering the gas passing through the reflux bleed line Granules. The organic waste gas pretreatment purification system according to claim 2, further comprising an organic substance concentration monitor, wherein the organic substance concentration monitor is disposed on the return air inlet pipe, the air inlet pipe of the painting process, and the drying process At least one of the inlet ducts is used to monitor the concentration of organic matter in the tube. The organic waste gas pretreatment purification system according to claim 2, further comprising a first air conditioning unit, wherein the first air conditioning unit is disposed on the air inlet duct of the painting process for adjusting the air inlet At least one of a granularity of gas in the tube, temperature, humidity, intake air volume, and intake air velocity. The organic waste gas pretreatment purification system according to claim 2, further comprising a second air conditioning unit, wherein the second air conditioning unit is disposed on the air inlet duct of the drying process for adjusting the air inlet At least one of a granularity of gas in the tube, temperature, humidity, intake air volume, and intake air velocity. The organic waste gas pretreatment purification system according to any one of claims 1 to 8, further comprising a temperature-controlled wet unit connected to the bus line and used to directly or indirectly heat the confluence Confluent exhaust gas in the pipeline. The organic waste gas pretreatment purification system according to any one of claims 1 to 8, wherein the humidification condensing unit has a defogger, and the demister is disposed downstream of the condensation chamber. The organic waste gas pretreatment purification system according to any one of claims 1 to 8, wherein the condensation chamber has a condenser. The organic waste gas pretreatment purification system according to any one of claims 1 to 8, wherein the humidification liquid provided by the humidification device has a temperature equal to or lower than a dew point temperature of the second exhaust gas. The organic waste gas pretreatment purification system of claim 12, wherein the condensation chamber has a porous layer. An organic waste gas purification method for painting operation, which is used for processing a first exhaust gas generated by a coating process in a painting operation and a second exhaust gas generated by a drying process, wherein the organic waste gas purification method comprises: increasing a wet condensation step of humidifying and condensing the second exhaust gas generated by the drying process; and a collecting step of converging the second exhaust gas after humidification and condensation with the first exhaust gas generated by the coating process as a confluent exhaust gas The confluent exhaust gas is introduced into a final tube end treatment device for purification treatment. The method for purifying an organic waste gas according to claim 14, wherein in the confluent step, the first exhaust gas generated by the coating process is filtered by the granular material, and then the second exhaust gas after being humidified and condensed. Convergence. The organic waste gas purification method of claim 15, further comprising a reflux bleed step, wherein the filtered first exhaust gas is drawn back to the inlet end of the coating process via a reflux bleed line and At least one of the inlet ends of the drying process. The method of claim 16, wherein the reflux bleed air line is provided with a third filter unit for filtering particulate matter in the gas. The organic waste gas purification method according to claim 16, further comprising an organic concentration monitoring step, wherein the return air inlet pipe, the air inlet pipe of the painting process, and the air inlet pipe of the drying process are disposed on at least one of An organic concentration monitor for monitoring the concentration of organic matter in the tube. The method for purifying an organic waste gas according to claim 16, further comprising an air conditioning step, wherein at least one of an air inlet end of the painting process and an air inlet end of the drying process is provided with an air conditioning unit to adjust the processing At least one of particulate matter, temperature, humidity, intake air volume, and intake air velocity in the gas entering the wind end. The method of purifying an organic waste gas according to any one of claims 14 to 19, wherein the confluent exhaust gas is subjected to a heat treatment to raise the temperature of the confluent exhaust gas to 20-40 ° C and the humidity is reduced to below 80% RH, and then enter The final tube end processing device.