JP6780276B2 - Paint mist treatment device - Google Patents

Description

The present invention relates to a paint component processing apparatus that removes a paint component from a gas containing a paint mist, which is a paint component generated in a painting operation or the like.

Conventionally, when painting work is performed in a painting facility using paint, a painting booth is provided to ventilate the room due to work hygiene problems because excess paint components remain in the room air. Exhaust gas containing paint mist composed of paint components is discharged from this painting booth to the outside of the system, which causes environmental pollution and pollution. Therefore, studies have been conducted to separate and remove paint components from exhaust gas.

As a means for separating and removing the paint component, a wet method (see, for example, Patent Document 1) in which the paint component is collected by contacting with washing water, or a filter, a buffer, or the like is used to collect the paint component. Examples thereof include a dry method for removing (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2-218436 JP-A-2000-5555

However, when the wet method is used, it is necessary to separately treat a large amount of wastewater containing a paint component, and there is a problem that the humidity becomes high when the exhaust gas is circulated and supplied to the painting work place. In addition, the process of treating wastewater containing paint components in the wet method is complicated. Therefore, attention is being paid to the removal of paint components by the dry method. Among them, the removal of paint components using a fibrous filter is adopted in many painting facilities.

However, in the removal of paint components using a conventional fibrous filter, it is very difficult to regenerate the filter by removing the highly adhesive paint components collected in the deep part of the fiber. Therefore, the fibrous filter must be replaced frequently, which requires excessive resource consumption and a large number of replacement work man-hours.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is a paint mist treatment apparatus capable of sufficiently removing paint components, eliminating or suppressing filter replacement, and saving resources. Is to provide.

As a result of diligent research by the present inventors in order to solve the above problems, the present invention has finally been completed. That is, the present invention is as follows.
(1) The filter particles to which the paint component is attached are filled, and by introducing a paint mist-containing gas containing the paint mist composed of the paint component, the paint component is attached to the filter particles and removed, and the paint component is removed. A particle filling tank that discharges the treated gas from which the particles have been removed, a desorption portion that desorbs the paint component from the filter particles to which the paint component is attached, and a desorption portion that discharges the filter particles from the particle filling tank to the desorption portion. A particle discharge part, a separation part for separating the paint component and the filter particles desorbed at the desorption part, and a circulation path for refilling the particle filling tank with the filter particles separated at the separation part. A paint mist treatment device equipped with.

According to the above configuration, the paint component contained in the paint mist-containing gas can be sufficiently removed by the particle filter, and the particle filter can be regenerated and circulated for repeated use, so that the filter does not need to be replaced and resources can be saved. ..

(2) The paint mist treatment apparatus according to (1), wherein the direction of introducing the paint mist-containing gas into the particle filling tank and the direction of flow of the filter particles in the particle filling tank are in a vertical relationship.
(3) The paint mist treatment apparatus according to (1) or (2), which uses two or more types of filter particles having different weights as the filter particles.
(4) The desorption portion is a paint mist treatment apparatus according to any one of (1) to (3), which desorbs a paint component from the filter particles by collision between filter particles to which the paint component is attached.
(5) The detached portion is provided with an uneven portion having an uneven shape on the surface, and the filter particles to which the paint component is attached are brought into contact with the surface of the uneven portion to desorb the paint component from the filter particles (1). (4) Any one of the paint mist treatment devices.
(6) The desorbed portion is a paint mist treatment apparatus according to any one of (1) to (5), which desorbs a paint component from paint filter particles by heat treatment.
(7) The separation unit is a paint mist treatment apparatus according to any one of (1) to (6), wherein a high wind speed gas is ventilated through the filter particles and the desorbed paint component, and the two are separated by a weight difference.
(8) The separation unit is a paint mist treatment apparatus according to any one of (1) to (7), wherein the filter particles and the desorbed paint component are immersed in a liquid to separate them by a difference in specific gravity.
(9) A paint mist-containing gas containing a paint mist composed of a paint component is brought into contact with the filter particles, the paint component is attached to the filter particles and removed, and the treated gas from which the paint component has been removed is discharged. A step, a desorption step of desorbing the paint component from the filter particles to which the paint component is attached, a separation step of separating the paint component desorbed in the desorption step and the filter particles, and the separation step. A coating mist treatment method comprising a circulation step of circulating the filter particles separated in the above step again so as to be used in the discharge step.

According to the paint mist treatment apparatus according to the present invention, the paint component contained in the paint mist-containing gas can be sufficiently removed by the particle filter, and the particle filter can be regenerated and circulated for repeated use, so that the filter needs to be replaced. You can save resources without doing so.

It is a conceptual diagram which shows the structure of the paint mist processing apparatus in embodiment. FIG. 1 is a conceptual diagram showing an example of the structure of a detachable portion of the paint mist treatment apparatus according to the embodiment. FIG. 2 is a conceptual diagram 2 showing another example of the structure of the detached portion of the paint mist treatment apparatus according to the embodiment.

Hereinafter, embodiments according to the invention will be described in detail with reference to the drawings. In the embodiments shown below, when the number, quantity, etc. are referred to, the scope of the present invention is not necessarily limited to the number, quantity, etc., unless otherwise specified.

FIG. 1 is a configuration diagram showing an example of the configuration of the paint mist treatment apparatus 10 of the present embodiment. As shown in FIG. 1, the paint mist treatment device 10 includes a particle filling tank 2 filled with filter particles 1, a particle discharging section 3, a desorbing section 4, a separating section 5, and a circulation path 7. ing.

The particle filling tank 2 is a tank in which the filter particles 1 are filled. When a paint mist-containing gas containing a paint mist composed of a paint component is introduced into a particle filling tank 2 filled with the filter particles 1 and brought into contact with the filter particles 1, the paint component is adhered and removed by the filter particles 1 to fill the particles. The treated gas is discharged from the tank 2.

In the particle filling tank 2, a net or a punching metal is installed between the contact surface between the filter particles 1 and the paint mist-containing gas (the introduction port of the paint mist-containing gas), and the paint mist-containing gas is uniformly introduced. The thickness is kept constant. The material of the net or the punching metal is not particularly limited, and for example, aluminum, iron, or stainless steel may be used. The source of the paint mist-containing gas to the particle filling tank 2 is surrounded by a duct (not shown) so that the paint mist-containing gas is not diffused.

Further, the discharge port (exhaust side) of the treated gas in the particle filling tank 2 is similarly provided with a net, a punching metal, or the like so that the treated gas is discharged. Further, the discharged port of the treated gas in the particle filling tank 2 is also connected to a duct (not shown).

The filter particles 1 are particles that collect paint components by adsorption (adhesion). The method of adsorption is not limited, and it may be chemical adsorption, physical adsorption, or a combination thereof. The filter particles 1 are preferably spherical. Since it is spherical, it can flow smoothly in the paint mist treatment device 10, and it is possible to suppress device failure due to clogging of the filter particles 1. The material of the filter particle 1 is not particularly limited, but among materials capable of adsorbing paint components, specifically, alumina, nylon, stainless steel, ceramic, zirconia, amber, PTFE, polypropylene, polyethylene, tungsten, chromium, steel, and glass. It is preferable to include at least one.

In the paint mist treatment apparatus 10, it is preferable to use two or more types of filter particles having different masses as the filter particles 1. When a paint mist-containing gas containing a paint mist having a small particle size is to be treated, it is necessary to design the average particle size of the filter particles 1 to be small as well. In that case, the weight of the filter particles 1 becomes small, and there is a possibility that the energy required for desorption cannot be obtained in the desorption portion 4 in the subsequent stage. Therefore, by mixing and filling the filter particles 1 having a relatively large mass, the energy required for desorption at the desorption portion 4 can be obtained, and the paint component can be efficiently desorbed from the filter particles.

Appropriately design the particle size (average particle size) of the filter particles according to the particle size of the paint mist introduced into the particle filling tank 2, and design the thickness of the particle filling tank 2 so as to obtain an appropriate pressure loss. Therefore, the paint mist processing device 10 can handle any paint mist. For example, in order to collect paint mist having a small particle size, the thickness of the particle filling tank 2 may be designed so that the average particle size of the filter particles 1 is reduced and the pressure loss is high.

The particle discharge unit 3 performs a discharge process of discharging the filter particles 1 to which the paint component is attached from the particle filling tank 2.

The particle discharge unit 3 may have, for example, a rotating body structure having a plurality of spaces for accommodating the filter particles 1, and the space may be configured to rotate from the particle filling tank 2 side to the desorption portion 4 side. By installing the particle discharging unit 3 below the particle filling tank, the filter particles 1 in the particle filling tank 2 are automatically accommodated in the space of the particle discharging unit 3 by their own weight. As a specific example, the particle discharge unit 3 includes a case connected to the downstream of the particle filling tank 2 or a part of the lower end of the particle filling tank 2, and a rotary valve rotating in the case. However, it is not limited to this.

When the particle discharge unit 3 is driven, the filter particles 1 flow in the particle filling tank 2 from the upper part to the lower part. The filter particles 1 are refilled from the upper part of the particle filling tank 2, and more paint components are attached as they move to the lower part. The filter particles 1 are discharged from the particle filling tank 2 by the particle discharge unit 3 and introduced into the desorption unit 4 from the transport line L1. In the transport line L1, the filter particles 1 to which the paint component is attached are transported by their own weight, for example, but another transport method may be used.

The moving speed of the filter particles 1 in the particle filling tank 2 depends on the concentration of the paint mist. Therefore, it is preferable that the particle discharge unit 3 can change the discharge rate of the filter particles 1. For example, if the filter particles 1 are clogged quickly, the discharge rate can be increased.

In the paint mist treatment apparatus 10, the direction in which the paint mist-containing gas is introduced into the particle filling tank 2 and the direction in which the filter particles 1 flow due to the filling and discharging of the filter particles 1 are made vertical to each other in the particle filling tank 2. The structure can be made simpler.

The desorption portion 4 performs a desorption treatment for desorbing the paint component adhering to the filter particles 1. The desorption treatment may be a chemical treatment, a physical treatment, or a combination thereof. The filter particles 1 are fluidly discharged from the particle filling tank 2 by the particle discharge unit 3. Therefore, the filter particles 1 located in the lower layer portion of the particle filling tank 1 are exposed at the detachment portion 4, and chemical and / or physical stress can be easily applied at the detachment portion 4.

The detached portion 4 may have a structure in which the filter particles 1 to which the paint component is attached collide with each other. With such a structure, the paint component can be effectively desorbed from the filter particles 1 by the vibration applied by the collision between the filter particles 1. FIG. 2 is a diagram showing an example of a detachment portion 4 of the paint mist treatment device 10. The detaching portion 4 shown in FIG. 2 has, for example, a drum shape and performs a rotational movement. The filter particles 1 adsorbing the paint component 8 are introduced into the rotating detachable portion 4, and the rotational movement of the detachable portion 4 causes collisions between the filter particles 1 and the adhered paint component 8 is detached.

Alternatively, the detached portion 4 may have a structure in which the filter particles 1 to which the paint component is attached are brought into contact with the uneven surface. With such a structure, a frictional force is applied to the filter particles by bringing them into contact with the uneven surface, and the paint component can be effectively desorbed. FIG. 3 is a diagram showing another example of the detachment portion 4 of the paint mist treatment device 10. The detached portion 4 shown in FIG. 3 is formed with an uneven portion 9 having an uneven surface inside. The filter particle 1 adsorbing the paint component 8 is introduced into the detaching portion 4 having the unevenness 9, and when the unevenness 9 and the filter particle 1 come into contact with each other, a frictional force is applied to the filter particle 1 and the paint component 8 is detached. ..

Alternatively, the detached portion 4 may have a structure in which the filter particles 1 to which the paint component 8 is attached are heat-treated. If the paint component has high adhesiveness, it may not be possible to easily remove the paint component only by physical treatment such as vibration or friction. By adopting a structure in which the filter particles are heat-treated, the adhesive component can be volatilized, decomposed or denatured, and the paint component can be cured.

Further, the detachable portion 4 may be a combination of any two or more of the structure shown in FIG. 2, the composition shown in FIG. 3, and the configuration to be heat-treated. Of course, the detachable portion 4 is not limited to the disclosed structure.

Returning to FIG. 1, the description of the paint mist treatment device 1 will be continued. After the paint component is desorbed from the filter particles 1 by the desorption portion 4, the mixture of the filter particles 1 and the paint component passes through the transport line L2 and is introduced into the separation portion 5. The transport line L2 transports the mixture by, for example, conveyor-type transport, air-type transport, or self-weight drop.

The separation unit 5 separates the filter particles 1 and the paint component.

The separation unit 5 may have a structure in which the filter particles 1 and the desorbed paint component are ventilated with a high wind speed gas, and the filter particles and the paint component are separated by a weight difference. This structure can be preferably used when the weight of the filter particles 1 is relatively larger than the weight of the paint component. The separated paint component passes through the transport line L5 and is stored in the paint recovery unit 6. When the separation unit 5 has the above structure using the high wind speed gas, the transfer line L5 is a flow path for the high wind speed gas.

Alternatively, the separation unit 5 may have a structure in which the filter particles 1 and the desorbed paint component are immersed in a liquid, and the filter particles and the paint component are separated by a difference in specific gravity. This structure can be preferably used when the specific gravity of the filter particles 1 is relatively larger than that of the liquid and the specific gravity of the liquid is relatively larger than that of the paint component. With this structure, the filter particles 1 are precipitated in the liquid, and the paint component is separated on the liquid surface and can be easily recovered. The paint component separated on the surface of the liquid is conveyed to the transfer line L5 together with a part of the liquid by, for example, a liquid feed pump, and is housed in the paint recovery unit 6.

The filter particles 1 separated from the paint component by the separation unit 5 pass through the transport line L3 and are introduced into the transport path 7. The transport line L3 transports the filter particles 1 by, for example, conveyor type transport, air type transport, or self-weight drop.

The circulation path 7 refills the particle filling tank 2 with the filter particles 1 separated by the separation section 6 through the transport line L4. As the transport type of the circulation path 7, a conveyor type that can automatically refill the filter particles 1 into the particle filling tank 2 or an air type that transports the filter particles 1 to the particle filling tank 2 by a high wind velocity gas is used. However, it is not limited to these.

The filter particles 1 transported in the circulation path 7 are refilled in the particle filling tank 2 through the transport line L4. The filter particles 1 filled in the particle filling tank 2 collect the paint component again from the paint mist-containing gas. After that, the above operation is repeated. As described above, the paint mist treatment apparatus 10 can continuously remove the paint mist by continuously collecting, desorbing, separating, and refilling the paint component by the filter particles 1.

In the present embodiment, the desorption portion 4 and the separation portion 5 are described separately in order to explain in detail each step performed by the coating mist treatment apparatus 10, but the desorption portion 4 and the separation portion 5 are described separately. It may be a structure in which and is integrated. Further, the transport line L3, the transport path 7, and the transport line 4 may be integrated.

Hereinafter, an example using the coating mist processing apparatus 10 described above will be described.

<Example 1>
In the paint mist treatment apparatus 10 of Example 1, in the particle filling tank 2, as filter particles 1, alumina filter particles having an average particle diameter (diameter) of 2 mm and alumina filter particles having an average flow diameter of 4 mm are mixed. It was used and filled so that the thickness of the paint mist-containing gas in the ventilation direction was 20 mm. Further, the desorption portion 4 has a structure in which the filter particles 1 are rotated to desorb the paint component, and the separation section 5 has a structure in which a high wind speed gas is introduced to accommodate the paint component in the paint recovery section.

To the paint mist treatment apparatus 10 of Example 1 configured as described above, a paint mist-containing gas 10 m ³ / min containing 1.8 g / min of acrylic resin-based paint mist was generated in the particle filling tank 2. Introduced. The average particle size of the paint mist used in Example 1 is estimated to be 10 to 100 μm.

The paint mist removal efficiency and pressure loss of the paint mist treatment apparatus 10 of Example 1 into which the paint mist-containing gas was introduced were measured. The paint mist removal efficiency was determined by sucking the inlet gas and the outlet gas of the particle filling tank 2 into a glass filter paper, collecting the paint mist, measuring the weight thereof, and determining the transmittance. Further, the pressure loss was obtained by measuring the static pressure between the inlet gas duct and the outlet gas duct of the particle filling tank 2 and obtaining the differential pressure thereof.

As a result, the paint mist removal efficiency was 99%, 99%, 99% and the pressure loss was 600, 610, 600 Pa after 0.1 hour, 2 hours, and 4 hours of operation of the paint mist treatment apparatus 10. .. Since the pressure loss is stable over time, it can be seen that the paint mist treatment apparatus 10 of Example 1 can stably collect, desorb, and separate the paint components.

<Example 2>
The paint mist treatment device 10 of Example 2 has the same structure as the paint mist treatment device 10 of Example 1 except that only filter particles having an average particle size of 2 mm are used as the filter particles 1 in the particle filling tank 2. did. Further, for the paint mist treatment apparatus 10 of Example 2, the introduced paint mist-containing gas and the introduction conditions were the same as those of Example 1, and the same operation and the same measurement were performed.

In the second embodiment, the paint mist removal efficiency after 0.1 hour, 2 hours, and 4 hours of operation of the paint mist treatment apparatus 10 is 99%, 99%, 99%, and the pressure loss is 650, 740, 730 Pa. Met. It was confirmed that the pressure loss increased over time 2 hours after the operation 0.1, and the pressure loss value did not recover even after that. From this, it is considered that in Example 2, a part of the paint component remains in the filter particles 1. Since the pressure loss is stable after 4 hours of operation, the coating mist treatment apparatus 10 of Example 2 stably collects, desorbs, and separates the coating component, although a part of the coating component remains. You can see that you can do it.

The embodiments and examples described above are exemplary in all respects and are not restrictive. The technical scope of the present invention is defined by the scope of claims and includes all modifications within the meaning and scope equivalent to the description of the scope of claims.

1 Filter particle 2 Particle filling tank 3 Particle discharge part 4 Detachment part 5 Separation part 6 Paint recovery part 7 Circulation path 8 Paint component 9 Concavo-convex 10 Paint mist treatment device L1 to L5 Conveyance line

Claims (7)

The filter particles to which the paint component adheres are filled, and by introducing a paint mist-containing gas containing the paint mist composed of the paint component, the paint component is attached to the filter particles and removed, and the paint component is removed. A particle filling tank that discharges the processed gas and
A desorption portion that desorbs the paint component from the filter particles to which the paint component is attached,
A particle discharge part that discharges filter particles from the particle filling tank to the detachment part,
A separation part that separates the paint component and the filter particles that were desorbed at the desorption part,
A circulation path for refilling the particle filling tank with the filter particles separated by the separation portion is provided.
The detached portion desorbs the paint component from the filter particles by collision between the filter particles to which the paint component is attached.
As the filter particles, two or more types of filter particles having different weights are used.
A paint mist treatment apparatus, wherein particles having a large mass among the filter particles are mixed with particles having a small mass to such an extent that energy required for desorption at the desorption portion can be obtained . The paint mist treatment according to claim 1, wherein the direction of introducing the paint mist-containing gas into the particle filling tank and the direction of flow of the filter particles in the particle filling tank are in a vertical relationship. apparatus. The detached portion includes an uneven portion having an uneven shape on the surface, and the filter particles to which the paint component is attached are brought into contact with the surface of the uneven portion to desorb the paint component from the filter particles. The paint mist treatment apparatus according to 1 or 2. The desorption unit, paint mist processing device according to claim 1, wherein the desorbed paint component from filter particles to any one of 3 by heat treatment. The paint mist according to any one of claims 1 to 4, wherein the separation portion allows high wind speed gas to be ventilated through the filter particles and the desorbed paint component, and separates the two by a weight difference. Processing equipment. The paint mist treatment apparatus according to any one of claims 1 to 5, wherein the separating portion immerses the filter particles and the desorbed paint component in a liquid and separates the two by a difference in specific gravity. .. A discharge step in which a paint mist-containing gas containing a paint mist composed of a paint component is brought into contact with the filter particles, the paint component is attached to the filter particles to be removed, and the treated gas from which the paint component has been removed is discharged.
A desorption step of desorbing the paint component from the filter particles to which the paint component is attached, and
A separation step of separating the paint component desorbed in the desorption step and the filter particles,
A circulation step in which the filter particles separated in the separation step are circulated again for use in the discharge step, and
Only including,
In the desorption step, the filter particles to which the paint component is attached are made to collide with each other to desorb the paint component from the filter particles.
Two or more types of filter particles having different weights are used as the filter particles.
A coating mist treatment method, wherein particles having a large mass among the filter particles are mixed with particles having a small mass to such an extent that energy required for desorption at the desorption portion can be obtained .