JP2006212565A - Coating booth apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating booth high in the rate of removal of foreign matter such as a volatile organic compound (VOC) in an exhaust gas and long in the service life of an air filter. <P>SOLUTION: This coating booth apparatus possesses an exhaust duct 7 provided with an exhaust fan 6 for introducing an exhaust gas containing coating material mist from the coating booth 2 and exhausting to the atmosphere, a drying chamber 3 arranged in the middle of the exhaust duct 7 and for passing at a high speed and drying the exhaust gas from the coating booth 2, a dust collector 4 for filtering the exhaust gas dried in the drying chamber 3 by an air filter to collect the dust and an activated carbon adsorption tower 5 arranged in the middle of the exhaust duct 7 to absorb and catch the dust in the exhaust gas. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a painting booth apparatus suitable for exhausting and purifying air in a painting booth used when painting an object to be painted such as an automobile body.

  Generally, in this type of painting booth, when an object to be coated such as an automobile body is spray-coated inside, for example, VOC (Volatile Organic Compound) is emitted from a solvent such as toluene in the paint. Disperse in. In addition, among paints sprayed by spray coating, there are not a few paint mists that are scattered in the air without being applied to the object to be coated, and VOCs are also dispersed in the air from this paint mist.

  This VOC is a major causative agent that causes photochemical air pollution along with NOx, and there are many types. Many of these VOCs have harmful effects on the human body, such as carcinogenicity, and also have the effect of secondary generation of SPM (Suspended Particulate Matter).

  And as an example of the conventional painting booth, there is one in which the air in the booth containing the paint mist is exhausted to an exhaust passage outside the booth by an exhaust fan, and is purified by passing through an air filter and then discharged to the outside air. (See Patent Document 1).

  However, in this type of painting booth, the air in the booth is purified only by an air filter, so there is a problem that the removal rate of foreign matters such as paint mist containing VOC is low.

  In addition, the moisture content of the exhaust gas containing paint mist is passed through the air filter without drying, so the paint mist in the exhaust gas adheres to the air filter and clogging occurs early, and there is this moisture content. Once the paint mist adheres to the air filter, it is difficult to wipe off the paint mist and dust adhering to the filter even if the air filter is backwashed with backwashing air. There is a problem.

  Therefore, as another conventional painting booth, there is a washing type. This is a configuration in which the air in the paint booth containing paint mist is introduced into the mist processing chamber by an exhaust fan, and a washing shower is sprayed from the nozzle to drop the paint mist together with water into the water in the lower aquarium. (For example, see Patent Documents 2, 3, and 4).

According to this washing-type paint booth, since the paint mist is captured by contact with water, the collection efficiency of foreign matters such as paint mist can be increased by increasing the chance of contact.
JP-A-8-150356 JP 2003-181343 A JP 11-309397 A JP-A-8-71468

  However, in such a conventional flush-type painting booth, in addition to using a large amount of water for washing, foreign substances such as paint mist containing VOC are contained in this large amount of waste water. There exists a subject that the water purification process which removes a foreign material is needed further.

  In addition, there is a problem in this flush-type painting booth that there is a large amount of noise from water showers, impact noises from surrounding walls, and noise from exhaust fan operation. That is, since the flush shower injects mist-like water from the injection nozzle into the exhaust duct, the impact sound at the time of the injection and the collision sound with the surrounding wall surface are high. In addition, since the sprayed sound is transmitted to the entire painting booth from the opening that is a suction port for shower water and is combined as noise, the working efficiency of the operator of the painting booth is reduced.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a coating booth apparatus having a high removal rate of foreign substances such as VOC in exhaust gas and a long life of an air filter.

  According to the first aspect of the present invention, there is provided an exhaust passage provided with an exhaust fan that introduces exhaust gas containing paint mist from a paint booth and exhausts it to the atmosphere, and an exhaust passage disposed in the exhaust passage and exhausted from the paint booth. A waste drying means that ventilates the air at a high speed, a dust collector that collects the dust exhausted by the exhaust air drying means through an air filter, and a dust collector that is disposed in the middle of the exhaust passage to remove dust in the exhaust gas. And an activated carbon adsorbing means that adsorbs and captures the exhaust gas treating apparatus.

  In the first aspect of the present invention, the high-speed ventilation in the exhaust drying means refers to a ventilation speed at which an air layer covering foreign matters such as fuel mist in the exhaust can be thinned or removed.

  According to a second aspect of the present invention, the exhaust drying means includes a drying chamber main body arranged to be ventilated in the middle of the exhaust passage, and an exhaust inlet of the drying chamber main body in the drying chamber main body. The exhaust treatment apparatus according to claim 1, further comprising a ventilation guide that is narrowly formed and forms an exhaust passage through which exhaust from the exhaust introduction port is ventilated at high speed.

  The invention according to claim 3 is the exhaust treatment apparatus according to claim 1, wherein the activated carbon adsorbing means is disposed downstream of the dust collector.

  The invention according to claim 4 is the exhaust treatment apparatus according to any one of claims 1 to 3, wherein the exhaust fan is disposed downstream of the activated carbon adsorbing means.

  According to the first aspect of the present invention, foreign matter such as dust other than VOC in the exhaust gas including paint mist from the paint booth is collected in advance by the air filter of the dust collector and removed, so the activated carbon adsorbing means Since it is sufficient to mainly adsorb and capture VOCs, the VOC removal rate can be improved, and the purification of exhaust gas can be increased correspondingly, and the life of activated carbon can be extended.

  Moreover, since the paint mist is dried by the exhaust drying means in advance upstream of the dust collector and the activated carbon adsorbing means, the air filter and the activated carbon adsorbing means of these dust collectors are clogged by moisture in the paint mist. It is possible to reduce the occurrence of the life and shortening the life. Further, even if the paint mist adheres to the air filter, the paint mist is almost powdered and easily peeled off. Therefore, the paint mist can be easily removed by jetting backwash air of the air filter. For this reason, the lifetime of the air filter can be extended.

  Further, since the exhaust drying means is dried by high-speed exhaust ventilation and does not use fire, it is possible to prevent the possibility of fire.

  Furthermore, according to the present invention, since it is not a flush type, noise such as an injection sound caused by a water shower and a collision sound with a surrounding wall surface can be prevented or reduced, so that the noise can be reduced. Moreover, both a large amount of water for washing and a large amount of waste water treatment can be omitted.

  Embodiments of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, the same or corresponding parts are denoted by the same reference numerals.

  FIG. 1 is a system diagram showing a system configuration of a composite coating booth 1 according to an embodiment of the present invention.

  As shown in FIG. 1, a composite coating booth 1 includes a coating booth 2 that is an example of an exhaust source, a drying chamber 3 that is an example of an exhaust drying means, a dust collector 4, and an activated carbon adsorption tower 5 that is an example of activated carbon adsorption means. The exhaust fan 6 that is a suction fan is sequentially connected in this order by an exhaust duct 7 that forms an exhaust path. The exhaust duct 7 includes first, second, third, fourth, and fifth exhaust ducts 7a, 7b, 7c, 7d, and 7e from the upstream side of the painting booth 2 toward the downstream side of the exhaust fan 6.

  The painting booth 2 has a sealed working space sufficient for painting a required object such as a car body by spray painting, an air supply device for supplying fresh outside air into the working space, There is an exhaust port for exhausting the exhaust in the work space to the outside, and the first exhaust duct 7a is connected to the exhaust port.

  As shown in FIG. 2, the drying chamber 3 is formed in a labyrinth shape by meandering the ventilation chamber main body 3a connected to the first exhaust duct 7a and the exhaust passage 3b in the drying chamber main body 3a. A plurality of baffle plates 3c, 3c, 3c,...

  The maze-like exhaust flow path 3b is configured to reduce the diameter of the flow path from the inner diameter of the exhaust introduction port connected to the first exhaust duct 7a, thereby allowing the exhaust to dry at a high speed. And the dust collector 4 is connected to the exhaust port of this drying chamber 3 by the 2nd exhaust duct 7b.

  The dust collector 4 includes, as an example of an air filter, a plurality of cloth bag filters (not shown), for example, in the main body casing. A clean room into which the exhaust flows later, and a dust collection room in which the bag filter is detachably disposed in communication with the dust room and the clean room. A third exhaust duct 7c is provided on the exhaust outlet side of the clean room. The exhaust gas inlet end of the activated carbon adsorption tower 5 is connected via

  The activated carbon adsorption tower 5 includes a tower main body for ventilating exhaust from the third exhaust duct 7c, and a plurality of ventilated activated carbon units arranged in parallel in the ventilation direction in the exhaust ventilation path in the tower main body. Each activated carbon unit is, for example, filled with a large number of adsorbed charcoal into a freely ventilated flat box-shaped unit body, and is detachably attached to the tower body.

  An exhaust inlet of an exhaust fan 6 that is a suction fan is connected to an exhaust port of the activated carbon adsorption tower 5 via a fourth exhaust duct 7d, and the first to fourth exhaust ducts 7a to 7d are connected by the exhaust fan 6. The exhaust inside each of the painting booth 2, the drying chamber 3, the dust collector 4 and the activated carbon adsorption tower 5 is sucked and exhausted. A fifth exhaust duct 7 e is connected to the exhaust outlet of the exhaust fan 6. The exhaust outlet of the fifth exhaust duct 7e is open to the outside air.

  Next, the operation of the composite coating booth 1 will be described.

  In the painting work space in the painting booth 2, clean outside air is always supplied by an air supply device (not shown), while the object to be painted is applied by, for example, spray painting on a desired object to be painted such as an automobile body. A paint mist that scatters in the air without being applied is generated. In this paint mist, VOC is contained in a solvent such as toluene. The air in the painting booth 2 including the paint mist is sucked by the exhaust fan 6 and exhausted into the drying chamber 3 through the first exhaust duct 7a.

  The exhaust discharged into the drying chamber 3 passes through the maze-like exhaust path 3b. Since the maze-like exhaust path 3b is smaller in diameter than the exhaust path of the first exhaust duct 7a on the upstream side, Ventilated at.

  For this reason, since the air layer which coat | covers various dusts (foreign matter), such as a fine paint mist, each becomes thin, a heat transfer coefficient becomes high. For this reason, foreign substances such as paint mist are dried.

  Exhaust gas containing foreign matter such as paint mist thus dried is then discharged into the dust collector 4 through the second exhaust duct 7b, where it is filtered when the bag filter is ventilated and contains various paint mists other than VOC. The dust is removed and purified. In addition, since foreign matter such as paint mist in the exhaust that passes through the bag filter is dried in advance, it prevents the bag filter from becoming clogged early due to moisture in the exhaust and shortening its life. Or it can be reduced. In addition, since foreign matter such as paint mist adhering to the bag filter has already been made into powder by the drying chamber 3, the paint mist adhering to the air filter can be backwashed by spraying back washing air into the bag filter. It is possible to easily remove and clean up foreign matters such as. Thereby, the lifetime of an air filter can be extended.

  The exhaust gas removed by the dust collector 4 is further discharged into the activated carbon adsorption tower 5 through the third exhaust duct 7c, and VOC in the exhaust gas is mainly adsorbed and removed when the activated carbon units are ventilated, Purified. For this reason, the removal rate of VOC can be increased.

  Moreover, foreign substances other than VOC in the exhaust gas are removed in advance by the dust collector 4 at the front stage (upstream side) of the activated carbon adsorption tower 5, so the activated carbon adsorption tower 5 may mainly adsorb and remove VOC. The VOC removal efficiency can be increased and the life of the activated carbon can be extended.

  The exhaust gas thus purified is sucked by the exhaust fan 6 and exhausted to the outside air.

  Therefore, according to this composite type coating booth 1, since the exhaust from the coating booth 2 is passed through the dust collector 4 and the activated carbon adsorption tower 5, both the removal rate of VOC and other foreign matters can be improved. Accordingly, exhaust gas purification can be enhanced.

  Moreover, since the drying chamber 3 is dried by high-speed ventilation of exhaust gas and does not use fire, it is possible to prevent the possibility of fire.

  Furthermore, according to this composite painting booth 1, since it is not a flush type, noise such as a spray sound caused by a flush shower and a collision sound with a surrounding wall surface can be prevented or reduced. can do. Further, a large amount of water for washing and a large amount of waste water treatment can be omitted.

  Furthermore, since the removal rate of VOC can be improved by the activated carbon adsorption tower 5, secondary generation of SPM (Suspended Particulate Matter) by the VOC can also be suppressed.

  Further, in the activated carbon adsorption tower 5, the activated carbon unit filled with activated carbon is detachably attached to the tower body, so that the activated carbon unit can be replaced as appropriate. Similarly, the bag filter can be replaced as appropriate in the dust collector 4.

  In the above embodiment, the case of the painting booth 2 has been described as an example of the exhaust source. However, the present invention is not limited to this, and other exhaust sources may be used. Moreover, the activated carbon adsorption tower 5 does not necessarily have a tower structure, and may be a structure such as a casing provided with an exhaust ventilation path having a capacity sufficient to vent the exhaust from the painting booth 2. Furthermore, a detoxifying means for directly converting VOC in the exhaust gas into calcium chloride by reacting with VOC may be provided on the downstream side of the activated carbon adsorption tower 5. Alternatively, this detoxifying means may be replaced with the activated carbon adsorption tower 5.

The system block diagram of the composite type painting booth which concerns on one Embodiment of this invention. The block diagram of the drying chamber shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combined type painting booth 2 Painting booth 3 Drying chamber 4 Dust collector 5 Activated carbon adsorption tower 6 Exhaust fan 7 Exhaust ducts 7a, 7b, 7c, 7d, 7e First to fifth exhaust ducts

Claims (4)

An exhaust path with an exhaust fan that introduces exhaust containing paint mist from the paint booth and exhausts it to the atmosphere;
A waste drying means that is disposed in the middle of this exhaust passage and exhausts the exhaust from the coating booth at high speed to dry it;
A dust collector for collecting the exhaust gas dried by the exhaust gas drying means through an air filter;
Activated carbon adsorption means arranged in the middle of the exhaust path to adsorb and capture dust in the exhaust,
The painting booth apparatus characterized by comprising. The exhaust drying means includes
A drying chamber main body arranged to be ventilated in the middle of the exhaust path;
A ventilation guide that is formed narrower than the exhaust introduction port of the drying chamber main body in the drying chamber main body, and forms an exhaust passage for venting the exhaust from the exhaust introduction port at a high speed,
The coating booth apparatus according to claim 1, comprising: The coating booth apparatus according to claim 1 or 2, wherein the activated carbon adsorption means is disposed downstream of the dust collector. The painting booth apparatus according to any one of claims 1 to 3, wherein the exhaust fan is disposed on the downstream side of the activated carbon adsorption means.

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