JPH04141266A - Coating facility - Google Patents

Abstract

PURPOSE:To reduce installation cost and space by connecting a waste water channel for waste washing water from a wet electrostatic precipitator to a separating means for separating and removing captured coating material from water for capturing mist which has captured mist of coating material at a mist removal means. CONSTITUTION:At a mist removal means 7, mist of coating material in waste gas A from a coating room 2 of a coating booth 1 is captured by water W for capturing mist. At a separating means 14, coating material captured is separated and removed from the water W having captured mist of coating material, at the means 7. At a wet electrostatic precipitator 11, waste gas A from which mist of coating material has been removed at the means 7 is purified. A waste water channel L for the waste washing water W from the precipitator 11 is connected to the means 14. Consequently, coating material and dust can be separated and removed from the waste washing water W of the precipitator 11 by means of the means for separating and removing coating material captured from water for capturing mist and hence installation cost and space can be reduced.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a mist removing means for trapping paint mist contained in exhaust gas from a painting room in a painting booth in mist trapping water, and a mist removing means for trapping paint mist contained in exhaust gas from a painting room in a painting booth. A separation means is provided for separating and removing a captured paint component from the mist capturing water that has captured the mist, and in addition, a wet electrostatic precipitator is provided for further purifying the exhaust gas from which paint mist is removed by the mist removing means. Regarding painting equipment.

[Conventional technology]

Figure 2 shows the conventional configuration of the above-mentioned coating equipment, (7)
The exhaust gas (A) discharged from the coating room (2) of the coating booth (1) and the mist trapping water (W) flowing down from the water flow lower pan (8) are routed at high speed through a curved constriction channel (9). A mist removing device (an example of the above-mentioned mist removing means) that allows the paint mist in the exhaust air (A) to pass through and capture the paint mist in the exhaust air (A) in the mist capturing water (IV) during the passage process (14) is a mist removing device (7). ) The mist trapping water (W) that has already captured the paint mist discharged from the separation tank (16) is stored in the separation tank (16).
In step 6), the captured paint portion of the mist trapping water (W) is floated and separated as paint sludge (S), and the paint sludge (S) floated and separated in the separation tank (16) is transferred to a small amount of the mist trapping water (W). The paint sludge (S) is then introduced into the flotation tank (17), where the paint sludge (S) is again concentrated and floated and separated, and then the paint sludge (S) is transferred to the flotation tank (17) by the scraping device (18). 17) and separates and removes the trapping agent from the mist trapping water (W) that has already captured the paint mist (an example of the above-mentioned separating means).

In addition, (11) is sent to the painting room (2) together with the mist trapping water (W) that has already captured the paint mist from the mist removing device (7).
The exhaust gas (A) from which paint mist has been removed is discharged into the lower exhaust chamber (10) through an extension duct (D) from the exhaust chamber (10).
(E ) stores the used washing water (W) discharged from the wet electrostatic precipitator (11) through the drainage channel (L) in a separation tank (El) for the dust collector, and
The paint content is floated and separated from the used washing water (W) as paint sludge (S) along with other fine dust, and then the paint sludge (S) is transferred to a separation tank (El) using a scraping device (E2). This is a separation device for a wet electrostatic precipitator that separates and removes paint and dust from the used washing water (W) of the wet electrostatic precipitator (11).

In other words, as typified by the example shown in Fig. 2 above, conventionally in this type of painting equipment, the mist removing means (7) separates and removes the captured paint from the mist capturing water (W) that captures the paint mist. Separation means (14) and exhaust (A)
Separation means (E) for the wet electrostatic precipitator was separately installed to separate and remove paint and dust from the wash water (W) used in the wet electrostatic precipitator (11) for highly purifying the water.

[Invention or problem to be solved]

However, the conventional equipment configuration described above has the problem of increasing equipment cost and equipment space.

In particular, a separation means (14) for separating and removing captured paint from the mist capturing water (W) that has captured paint mist in the mist removing means (7), and a wet electrostatic precipitator (11).
A water tank (1
6), (17), and (El), the above-mentioned problems were particularly noticeable due to the increased construction cost and equipment space of the aquarium.

An object of the present invention is to solve the above-mentioned problems by rationally improving the equipment configuration.

[Means to solve the problem]

The first characteristic configuration of the painting equipment according to the present invention is a mist removing means for trapping paint mist contained in exhaust gas from a painting room in a painting booth in mist trapping water, and a mist removing means for trapping paint mist in the mist removing means. Separation means for separating and removing captured paint from the capture water, and a wet electrostatic precipitator for purifying the exhaust gas from which paint mist has been removed by the mist removing means, and a drainage channel for used washing water in the wet electrostatic precipitator is provided. , is connected to the separation means, and its functions and effects are as follows.

[For production]

That is, in the first characteristic configuration described above, the drainage channel for the used washing water in the wet electrostatic precipitator is connected to the separating means for separating and removing the captured paint from the mist capturing water that has captured paint mist in the mist removing means. By this,
The separating means is also used as a purifying means for the used washing water of the wet electrostatic precipitator, and the mist removing means separates and removes the captured paint from the mist capturing water that has captured paint mist, and the wet electrostatic precipitator The separation means can perform both the separation and removal of paint and dust from the used washing water.

〔Effect of the invention〕

As a result of the above, according to the first characteristic configuration of the present invention, the mist removing means separates and removes the captured paint from the mist trapping water that has captured the paint mist, and the mist remover separates and removes the trapped paint from the cleaning water used in the wet electrostatic precipitator. Compared to the conventional equipment configuration in which separation means for a wet electrostatic precipitator that separates and removes dust and dust are installed separately, the above-mentioned separation means can be used for both purposes, and pumps, etc. Coupled with the fact that various accompanying devices can be used together, equipment costs and equipment space can be reduced to a large extent.

[Second Characteristic Configuration of the Present Invention] A second characteristic configuration of the present invention is to provide a circulation means for circulating and supplying the mist trapping water from which the trapped paint has been separated and removed in the separating means to the mist removing means. fresh water supply means for supplying fresh washing water to the electrostatic precipitator;
A diverted water supply means is provided which supplies part of the mist trapping water circulated and supplied by the circulation means to the wet electrostatic precipitator as cleaning water, and the amount of fresh washing water supplied by the fresh water supply means and the diverted water supply are controlled. By providing an adjustment means for changing and adjusting the amount of washing water supplied by the means, the first characteristic configuration described above is implemented (see Fig. 1), and the amount of used washing water ( When implementing the configuration in which the drainage channel (L) for water (W) is connected to the separating means (14), if the above-mentioned second characteristic configuration is adopted, the wet electrostatic precipitator (11
), the fresh washing water (W) supplied to the wet electrostatic precipitator (1
After use in step 1), mist removal means (7) and separation means (1) are removed.
4), and can be used as make-up water for the evaporative consumption of the mist trapping water (W) in the mist trapping water circulation system consisting of the circulation means (25) and (26), and the fresh water can be used as fresh water by the fresh water supply means (27). Washing water (W
) and the amount of cleaning water (
By changing and adjusting the supply amount of the circulating mist trapping water (W) using the adjusting means (29), the required amount of washing water in the wet electrostatic precipitator (11) can be adjusted by adjusting the supply amount of the circulating mist trapping water (W).
), and the amount of fresh cleaning water supplied by the fresh water supply means (27). (the maximum amount of make-up water that can be supplied to the mist-trapping water circulation system) can be supplied to the wet electrostatic precipitator (11), and the in-machine cleaning effect of the wet electrostatic precipitator (11) can be improved. As a result, the dust collection performance of the wet electrostatic precipitator (11) can be maintained as high as possible.

[Third characteristic configuration of the present invention] A third characteristic configuration of the present invention is that in the painting booth,
An exhaust chamber is provided to receive exhaust gas from which paint mist has been removed and which is discharged from the mist removal means, and which receives water for mist capture in the paint mist capture method which is discharged from the mist removal means together with the exhaust gas from which paint mist has been removed. A water tank that is later sent to the separation means is disposed at the bottom of the exhaust chamber, and the wet electrostatic precipitator is connected to the wall of the exhaust chamber,
and a configuration in which the exhaust openings formed in each of the wet electrostatic precipitators are arranged in close opposition to each other, and the drainage channel for used washing water in the wet electrostatic precipitator is connected to the separation means; The used washing water received by the washing water receiving pan of the electrostatic precipitator flows into the water tank through drainage openings arranged in close opposition to each other formed in the chamber wall of the exhaust chamber and the wet electrostatic precipitator. If this third characteristic configuration is adopted (see Figure 1), in the painting booth (1), the exhaust gas from which paint mist has been removed is discharged from the mist removal means (7). An exhaust chamber (10) for receiving (A) is provided, and the mist trapping water ( A water tank (13) that receives W) and then sends it to the separation means (14).
) is installed at the bottom of the exhaust chamber (10), which is the general layout of this type of painting equipment. Compared to the configuration in which the separately installed wet electrostatic precipitator (11) and the exhaust chamber (10) are installed at a location away from the exhaust chamber (10) in , the chamber wall (31) of the exhaust chamber (10), and the exhaust openings (32) formed in each of the wet electrostatic precipitator (11) are arranged so that the exhaust openings (32) are close to each other and face each other.
11), the wet electrostatic precipitator (11) is installed facing away from the painting booth (1), making the equipment configuration more compact.
0) and the wet electrostatic precipitator (11) is omitted, the hopper duct (HD) at the connection between the exhaust duct (D) and the wet electrostatic precipitator (11) is omitted.
Coupled with the fact that no equipment is required, it is possible to further save equipment space.

Moreover, the used washing water (W) in the wet electrostatic precipitator (11)
) to the separation means (14), the chamber wall (31) of the exhaust chamber (10) and the wet electrostatic precipitator (1
In the above configuration in which the wet electrostatic precipitator (11) is arranged in such a manner that the exhaust openings (32) formed in each of the exhaust openings (32) are close to each other and face each other, the cleaning water receiving pan (34) of the wet electrostatic precipitator (11) is The used washing water (W) is disposed of on the chamber wall (31) of the exhaust chamber (10) and the wet electrostatic precipitator (11).
drainage openings (33
) at the bottom of the exhaust chamber (a water tank that receives the mist trapping water (W) of the paint mist trapping method discharged from the mist removing means (7) and then sends it to the separating means (14)). By arranging the mist trapping water (W) of the paint mist trapping method discharged from the mist removal means (7) and the used cleaning water (W) discharged from the wet electrostatic precipitator (11), A channel for guiding the mist trapping water (W) of the paint mist trapping method from the water tank (I3) to the separating means (I4) by merging them and guiding them from the water tank (13) to the separating means (4). (15),
It can also be used as the drainage channel (L) for the used washing water (W) of the wet electrostatic precipitator (11);
Compared to forming L) with a dedicated conduit and extending that dedicated conduit to the wet electrostatic precipitator (11) and the separation means (14), the flow path configuration can be simplified and the overall equipment cost can be further reduced. It becomes possible to save money.

〔Example〕

Next, an example will be described.

Figure 1 shows the equipment configuration of the coating equipment according to the present invention, (1
) is a painting booth, and a tunnel-shaped painting room (2) in this painting booth (1) is equipped with a painting machine (3) that sprays and paints the object to be painted (P) carried into the room. There is.

The ceiling (4) of the painting room (2) is formed with an air outlet that blows ventilation air whose temperature and humidity have been adjusted by the air conditioner (5) downward into the painting room (2). The floor (6) of the painting room (2) is a lattice floor that allows the indoor air in the painting room (2) to be discharged downward, and the sprayed indoor paint mist generated during painting is discharged downward together with the indoor air. It is as follows.

Below the grid floor (6), that is, at the bottom of the painting room (2), the paint mist contained in the exhaust air (A) from the painting room (2) is captured in the mist trapping water (W), and the exhaust air ( A) is equipped with a mist removing device (7) that purifies the water, and the configuration of this mist removing device (7) consists of a pair of mist trapping water (W) that flows down towards the center of the booth width direction. A water flow pan (8) is provided below the grid floor (6), and the mist trapping water (W) flowing down from the water flow pan (8) is connected to the downstream end of the water flow pan (8) from above. The bent throttle flow path (9) allows the exhaust gas (A) to pass through at high speed.
), and the exhaust (
The paint mist in A) is captured by the mist capturing water (W).

An exhaust chamber (10) is formed below the painting chamber (2) to receive the exhaust gas (A) from which paint mist has been removed, which is discharged from the bent throttle channel (9). )
In the middle of the exhaust route from the exhaust (A), fine paint mist and fine dust still remaining in the exhaust (A) are collected and removed.
) A wet electrostatic precipitator (If) is installed to further purify the air.

The exhaust gas (A) that has been purified in two stages by the mist removal device (7) and the wet electrostatic precipitator (11) is then disposed of outside the system or returned to the air conditioner (5) and sent to the painting room. 2)
reused for ventilation.

In the figure (12) is an exhaust fan.

Exhaust air (A) from which paint mist has been removed from the curved throttle channel (9)
Regarding the mist trapping water (W) of the paint mist trapping method, which is also discharged into the exhaust chamber (10), there is a water tank (13) that receives the mist trapping water (W) of the paint mist trapping method.
is formed at the bottom of the exhaust chamber (10), and a separation device (14) for separating and removing the trapped paint from the mist trapping water (W) of the paint mist trapping method is installed separately from the painting booth (1). The mist trapping water (W) of the paint mist trapping method is received by the water tank (13), and after being received, the water (W) is passed through the flow path (13).
15) from the water tank (13) to the separation device (14).

Regarding the device configuration of the separation device (14), the exhaust chamber (10
) for storing mist trapping water (W) supplied from the water tank (13) through the flow path (15) in the paint mist trapping method,
A separation tank (16) is provided to float and separate the captured paint portion of the mist trapping water (W) as paint sludge (S), and the paint sludge (S) floated and separated in this separation tank (16) and a small amount of mist are captured. By introducing irrigation water (W),
A flotation tank (in which the paint sludge (S) is concentrated and floated again)
17), and a scraping device (18) for taking out and collecting the paint sludge (S) floated and separated in the flotation tank (17) from the flotation tank (17).

(19) is a small amount of water overflow (W) in the separation tank (16).
This is an accumulation tank in which floating paint sludge (S) is collected and flows into the accumulation tank (19), and the paint sludge (S) accumulated in this accumulation tank (19) is pumped with overflowing water (W) through the channel (21) by a pump (20). The water is supplied to the bottom of the flotation tank (17) via the flotation tank (17).

In the flotation tank (17), paint sludge (S) and mist trapping water (W) are supplied to the bottom from the flow path (21).
) is ejected upward, and paint sludge (S
) is separated and removed, and the mist trapping water (W) is discharged from the water outlet (22) located at the upper end of the tank, thereby forming an upward flow in the tank to promote floating separation of paint sludge (S). It is set as.

The paint sludge (S) taken out and collected from the flotation tank (17) by the scraping device (18) is transferred to the mouth collection container (23).
and then sent to an appropriate post-processing step.

In addition, the mist trapping water (W) separated and removed from the paint sludge (S) in the flotation tank (17) is transferred to the water outlet (22).
After the water is discharged from the separation tank (1) through the channel (24)
6).

The purified mist trapping water (W) from which the trapped paint has been separated and removed by the separator (14) with the above configuration is taken out from the bottom of the separation tank (16) by the bomb (25), and is taken out from the bottom of the separation tank (16) through the circulation channel (2
The water is circulated and supplied to the water flow pan (8) through the water flow pipe (6), so that it can be reused for capturing paint mist in the mist removal device (7).

On the other hand, in order to supply washing water ('N) for washing away collected dust to the wet electrostatic precipitator (11), fresh washing water (
- part of the mist trapping water (W) is separated from the fresh water supply path (27) that supplies the water (W) and the circulation flow path (26),
The diverted water supply channel (28) that supplies the diverted mist capturing water (W) as cleaning water is connected to the wet electrostatic precipitator (11), and the fresh water supply channel (27) and the diverted water supply channel ( 28) has both supply channels (27), (28)
A valve device (29) is interposed to change and adjust the amount of wash water (W) supplied from each of the wash water (W).

(30) is a strainer installed in the diverted water supply channel (28) in order to remove fine paint slag remaining in the purified mist trapping water (W) that is supplied as cleaning water to the wet electrostatic precipitator (11). be.

Regarding the installation configuration of the wet electrostatic precipitator (11), the side wall (31) of the exhaust chamber (10) and the wet electrostatic precipitator (
The exhaust chamber (lO) is constructed with the exhaust openings (32) formed in each of the exhaust chambers (11) closely facing each other, and the exhaust duct connecting the exhaust chamber (10) and the wet electrostatic precipitator (11) omitted.
The wet electrostatic precipitator (11) is placed against the side wall (31) of the exhaust chamber (10) so that the exhaust air (A) is directly introduced into the wet electrostatic precipitator (11) from the inside of the wet electrostatic precipitator (11). As a result, the wet electrostatic precipitator (11) is installed integrally with the coating booth (1), thereby making the equipment configuration more compact.

In addition, in its installation configuration, a wet electrostatic precipitator (11)
The cleaning water receiving pan (34) in the exhaust chamber (lO
) and the wet electrostatic precipitator (11), the drain openings (33) are arranged close to each other and are arranged in a slanted position such that exhaust air is discharged through the drain openings (33). It is arranged so as to be connected to the inclined bottom (35) of the chamber (10), so that the used washing water (W) received by the washing water receiving pan (34) flows through the drainage opening (3).
3) into the exhaust chamber (10), and flows into the exhaust chamber (10) through the exhaust chamber (10).
10) and flows down on the inclined bottom (35) of the exhaust chamber (10).
It is designed to flow into a water tank (13) at the bottom.

In other words, the water tank (13) receives the mist trapping water (W) of the mist trapping method discharged from the mist removing device (7).
A channel for guiding the mist capture water (W) of the mist capture method from the water tank (13) to the separation device (14) by flowing the used washing water (W) from the wet electrostatic precipitator (11) into the (15) is also used as a drainage channel (L) for the used washing water (W) from the wet electrostatic precipitator (11).
) is guided to the separation device (14) through the flow path (15) together with the mist capture water (W) of the mist capture method discharged from the mist removal device (7), and thereby the separation device (14) is converted into a wet type. Used washing water (W) of electrostatic precipitator (11)
) in a state where it is also used as a purification treatment means for
The separation and removal of paint and dust from the used washing water (W) of the wet electrostatic precipitator (11) is carried out in conjunction with the separation and removal of the captured paint from the mist trapping water (W) of the mist trapping method. The separation device (14) is used for this purpose.

Further, in the above configuration, the fresh water supply path (27)
Fresh washing water (W
) is used in the wet electrostatic precipitator (11), and then the mist trapping water (W ) is used as make-up water for evaporative consumption of water, and the amount of washing water supplied from the fresh water supply path (27) and the diversion water supply path (28) is changed and adjusted by the valve device (29). So, a wet electrostatic precipitator (11
), the required amount of washing water is the sum of the amount of washing water supplied from the diversion water supply path (28) and the amount of fresh washing water supplied from the fresh water supply path (27), while ensuring as much fresh washing water as possible. (W), that is, the amount of fresh cleaning water (W) equivalent to the evaporative consumption of the mist trapping water (W) (the maximum amount of make-up water that can be supplied to the mist trapping water circulation system) is sent to the wet electrostatic precipitator (11). The cleaning effect inside the wet type electrostatic precipitator (11) and, by extension, the dust collection performance of the wet type electrostatic precipitator (11) are maintained as high as possible.

[Another example]

Next, another example will be listed.

(1) Water for mist capture (W) removes paint mist in the exhaust air (A).
) The mist capture format and specific device configuration of the mist removal means (7) to be captured by the mist removal means (7) are not limited to the format and configuration shown in the above-mentioned embodiments. It is possible to apply a trapping type or a device with various device configurations. For example, a stirring blade that is cleaned by cleaning water is provided in the confluence flow path of the mist trapping water (W) and the exhaust (A). The stirring action of the stirring blade may improve the trapping efficiency of paint mist trapping by the mist trapping water (W).

Furthermore, the separation format and specific device configuration of the separation means (14) for separating and removing the captured paint from the mist trapping water (W) that captures paint mist are also limited to the format and configuration shown in the above-mentioned embodiments. Rather, various other separation types and various device configurations can be applied to this separation means (14) as well.

(2) In the case of employing the second feature of the present invention described above, the amount of fresh washing water (W) supplied by the fresh water supply means (27) and the amount of washing water (W) supplied by the diverted water supply means (28)
The specific adjustment structure of the adjustment means (29) that changes and adjusts the supply amount of can be changed in various configurations.

Moreover, if the second characteristic configuration of the present invention is adopted, it may be advantageous to maintain high cleaning effect and dust collection performance of the wet electrostatic precipitator (11). A make-up water means may be provided in the circulation path of the trapping water (W), and cleaning water may be supplied to the wet electrostatic precipitator (11) only by the diverted water supply means (28).

(3) If the above-mentioned third characteristic configuration of the present invention is adopted, it may be more advantageous in terms of compactness and simplification of the equipment configuration.
O) and the wet electrostatic precipitator (11) may be connected via an exhaust duct (D), or the wet electrostatic precipitator (11) may be connected via the exhaust duct (D).
A drainage channel (L) for the used washing water (W) in step 11) is formed with a dedicated pipe, and the dedicated pipe is connected to a wet electrostatic precipitator (
11) to the separation means (14).

(4) The mist trapping water (W) that also serves as the separation means (14) for purification and the cleaning water (W) for the wet electrostatic precipitator (11) are not limited to simple water, but may contain various chemicals. A mixture may also be used.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure of the accompanying drawings by such entry.

[Brief explanation of the drawing]

FIG. 1 is an equipment configuration diagram showing an embodiment of the present invention, and FIG. 2 is an equipment configuration diagram showing a conventional example. (1)...Painting booth, (2)...Painting room, (7)...Mist removal means, (10)...
...exhaust chamber, (11) ...wet electrostatic precipitator, (13) ...water tank, (14) ...
Separation means, (25), (26)... circulation means, (27)... fresh water supply means, (28)...
... Diversion water supply means, (29) ... Adjustment means, (31) ... Room wall, (32) ...
Exhaust opening, (33)... Drainage opening, (34
)...Cleaning water catch pan, (A)...
・Exhaust, (W)...Water for mist capture/Washing water,
(L)・・・Drainage channel.

Claims (1)

[Claims] 1. Water (W) for capturing paint mist contained in the exhaust air (A) from the painting room (2) in the painting booth (1)
a separation means (14) for separating and removing the captured paint from the mist capturing water (W) that has captured paint mist in the mist removing means (7);
), and a wet electrostatic precipitator (11) for purifying the exhaust air (A) from which paint mist has been removed in the mist removing means (7).
), and a drainage channel (L) for the used washing water (W) in the wet electrostatic precipitator (11) is connected to the separation means (1).
4) Painting equipment connected to. 2. The mist capturing water (W) from which the captured paint has been separated and removed by the separating means (14) is transferred to the mist removing means (14).
7) are provided with circulation means (25) and (26) for circulating and supplying fresh washing water (W) to the wet electrostatic precipitator (11).
), and a part of the mist trapping water (W) that is circulated and supplied by the circulation means (25) and (26) is used as washing water to clean the wet electrostatic precipitator (1).
1) is provided, and the amount of fresh washing water (W) supplied by the fresh water supplying means (27) and the amount of washing water (W) supplied by the branching water supplying means (28) are adjusted. 2. The coating equipment according to claim 1, further comprising adjusting means (29) for changing and adjusting the supply amount. 3. In the painting booth (1), the exhaust gas (A) from which paint mist has been removed is discharged from the mist removing means (7).
An exhaust chamber (10) is provided to receive the paint mist, and the mist trapping water (W) from which the paint mist has been captured is discharged from the mist removing means (7) together with the exhaust gas (A) from which the paint mist has been removed to the exhaust chamber (10). After the separation means (1)
4) is disposed at the bottom of the exhaust chamber (10), and the wet electrostatic precipitator (11) is connected to the chamber wall (31) of the exhaust chamber (10) and the wet type electrostatic precipitator (11). The exhaust openings (32) formed in each of the electrostatic precipitators (11) are arranged so as to closely face each other, and the wet electrostatic precipitator (11)
The drainage channel (L) for the used washing water (W) in 1)
is connected to the separating means (14), and the used washing water (W) received by the washing water receiving pan (34) of the wet electrostatic precipitator (11) is connected to the exhaust chamber (10).
) is arranged so as to flow into the water tank (13) through drainage openings (33) formed in the chamber wall (31) of the wet electrostatic precipitator (11) and arranged close to each other and facing each other. The coating equipment according to claim 1 or 2.