JP4225522B2 - Exhaust purification device for surface treatment tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in an exhaust purification device for a surface treatment tank provided in a plating tank or the like of a plating treatment system.
[0002]
[Prior art]
Conventionally, plating tanks and chemical treatment tanks in plating systems generate mist containing various bath components from the plating solution, etc., together with steam, etc., due to electrode reactions and heating. Is arranged. For example, a large hood is disposed above the processing tank, and then the duct is guided to a mist removing device by a duct to remove the mist, and then the purified air is discharged outdoors.
[0003]
It is necessary to prepare a space for installing such a mist removing device and an exhaust fan device in the vicinity of the surface treatment device, and the existing surface treatment device requires special installation space. It was.
In addition, it is necessary to install a large-diameter duct between the surface treatment device and the mist removing device or before and after the exhaust fan device and to the outdoors in order to guide the exhaust. In addition, there was a problem that occupied the space in the factory.
Furthermore, the conventional mist removing apparatus needs to be frequently washed, but the washing water needs to be subjected to waste water purification treatment as waste liquid, and there is a problem that it becomes a burden on the waste water purification treatment facility.
[0004]
[Problems to be solved by the invention]
The present invention was made in order to solve the above-mentioned problems, prevents scattering of the generated mist in the treatment tank, reduces the concentration purification apparatus without releasing the collected mist to the outside, and Provided is an exhaust purification device for a surface treatment tank that can suppress exhaust and waste water discharge to the utmost limit.
[0005]
[Means for Solving the Problems]
The above problem is that the mist generated from the treatment liquid is collected in the upper opening of the surface treatment tank by the airflow generated from the air supply port provided on one side toward the intake port provided on the other side. In addition to installing an air curtain device, the exhaust casing that follows the air inlet of the air curtain device is equipped with a spray nozzle that sprays water to remove mist in the exhaust and fills the casing with mist-like water droplets in front of it. In addition, a first mist removing unit having a bottom for storing the mist-like water droplets that have absorbed and dropped the mist is provided, and the mist that has not been removed by the first mist removing unit is separated and removed at the subsequent stage. A mist separator comprising an impeller and a motor that rotates the impeller. The impeller sucks exhaust gas from the first mist removing section, and the impeller collects mist in the exhaust gas. It has a storage part that collides with the inner wall surface, collects it, flows down along the wall surface, and stores it, and supplies the exhaust gas separated and removed to the air supply port to form an air curtain airflow. In addition, this can be solved by the exhaust gas purification apparatus for a surface treatment tank according to the present invention, characterized in that a second mist removing section that is circulated is provided.
[0006]
In addition, the present invention supplies the mist-containing water collected at the storage bottom of the first mist removal unit to a spray nozzle for circulation and uses the liquid collected at the storage of the second mist removal unit. The present invention can be embodied as an exhaust gas purification device for a surface treatment tank in which mist is returned to the surface treatment tank.
[0007]
According to the present invention, since the generated mist is collected in the airflow of the air curtain device, harmful mist can be prevented from being scattered in the space near the surface treatment tank. Furthermore, since the mist in the exhaust gas is removed by the first and second mist removing sections provided in two stages, the centralized purification facility can be reduced in size and space saving can be achieved.
Furthermore, in the 1st mist removal part using a spray, harmful gas can be removed besides mist. In addition, since exhaust can be used as supply air for air curtain devices, exhaust facilities such as ducts and fan devices can be miniaturized, and liquid mist that has been separated and removed can be returned to the treatment tank for use as wastewater treatment facilities. There is an advantage that can reduce the load.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment according to the exhaust gas purification apparatus for a surface treatment tank of the present invention will be described with reference to FIG.
The feature of the present invention is that in FIG. 1, first, an opening 11 directed upward from the surface treatment tank 1 is changed from an air supply port 21 provided on one side to an intake port 22 provided on the other side. The air curtain device that collects mist generated from the processing liquid 12 by generating an air flow 23 flowing along the surface of the processing liquid 12 is provided.
Further, the exhaust casing 3 following the air inlet 22 of the air curtain device is provided with a first mist removing portion 4 in which a spray nozzle 41 for spraying water in order to remove mist in the exhaust is disposed, and thereafter The stage is provided with a second mist removing section 5 provided with a mist separator 51 for separating and removing mist.
[0009]
Then, as the mist separator 51 provided in the second mist removal unit 5, because has a such blowing function as a fan device as described below, to obtain a pre-Symbol airflow 23 for the air curtain, a dedicated separate There is no need to dispose the fan device in the exhaust duct.
[0010]
Moreover, in the 1st mist removal part 4, if water is sprayed from the 1 or 2 or more spray nozzle 41, and a mist-like small diameter water droplet (about 100 micrometers) will be filled in a casing, it will flow in from the inlet port 22. Mist in the exhaust is absorbed by contact with the mist-like small-diameter water droplets. Most of the water droplets that have absorbed the mist descend in the casing and are stored in the bottom 42.
[0011]
Further, the exhaust gas from which most of the mist has been removed in the first mist removing unit 4 flows into the second mist removing unit 5 disposed continuously upward along with a small amount of the small-diameter water droplets. The second mist removing unit 5 is provided with a mist separator 51 for separating and removing mist.
[0012]
The mist separator 51 used in this embodiment illustrated in FIG. 1 includes an impeller 51a and a motor 51b that rotates the impeller 51a at high speed. The impeller 51a actively sucks exhaust from the first mist removing unit 4. However, it has a fan function for sending it to the upper exhaust duct 31. Then, a floating substance such as mist in the exhaust is caused to collide with the side surface of the rotating impeller 51a and collected, and further collided with the wall surface provided on the outer periphery of the impeller 51a by the centrifugal force of rotation. The mist is separated and removed from the exhaust gas. In the apparatus of FIG. 1, the mist is made to collide with the inner wall of the second mist removing unit 5 and then flow down along the inner wall to be separated into the lower storage unit 52. Yes.
[0013]
According to the embodiment of the present invention described above, harmful mist generated from a plating tank or the like is collected in the airflow of the air curtain device, and thus can be prevented from being scattered in the space or floor near the surface treatment tank. . Furthermore, since the mist in the collected exhaust gas is efficiently removed by the first and second mist removing sections provided in the structure in which the tiers are stacked in two stages, the purification equipment itself can be downsized, Space saving can now be achieved.
[0014]
Further, in the embodiment of FIG. 1, the mist-containing water collected at the bottom 42 of the first mist removing unit 4 is supplied to the spray nozzle 4 by a pipe 43 and a pump (not shown), and can be circulated and used as spray water. It is preferable to configure as described above. The mist-containing water collected at the bottom 42 of the first mist removing unit 4 can be used without any problem as spray water because the concentration of the contained chemical itself is low. There is no need to discharge, and the discharge amount can be suppressed, so that there is an advantage that the load of the waste water treatment apparatus in the factory is hardly affected.
[0015]
Further, in the embodiment of FIG. 1, the exhaust gas separated and removed by the second mist removing unit 5 is supplied to the air supply port 21 of the air curtain device and blown out, and is sucked from the intake port 22 to be circulated. It is preferable to configure so as to. In this case, the exhaust duct 31 for guiding the exhaust sent out from the second mist removing unit 5 is configured to be branched into a duct 32 directed to the outside and a duct 33 guided to the air supply port 21 at the tip thereof. preferable. It is appropriate to provide the ducts 32 and 33 with dampers 32a and 33a that can adjust the amount of air passing therethrough.
Thus, since exhaust gas is circulated and used, it is possible to minimize the amount of discharge to the outside. Therefore, the exhaust duct installed in the factory, the exhaust fan device can be downsized, and the exhaust gas terminal treatment device can be omitted. , Construction costs can be reduced or space can be saved.
[0016]
Furthermore, in the embodiment of FIG. 1, the liquid mist separated and collected in the storage section 52 below the second mist removing section 5 is returned to the surface treatment tank 1 or the washing tank through a pipe 53. Thus, since the liquid mist to be returned has the same component as the processing liquid 12 that is the generation source, it is used as a replenisher for the processing liquid 12 and does not need to be discharged as waste water as in the prior art. Therefore, the advantage that it does not become the load of the waste water treatment apparatus of a factory is acquired.
[0017]
【The invention's effect】
Since the exhaust gas purification apparatus for a surface treatment tank of the present invention is configured as described above, a purification apparatus capable of preventing the generated mist from scattering without collecting the generated mist from the treatment tank and releasing it to the outside. Since the size can be reduced, the equipment cost can be reduced and the space efficiency can be improved. According to the embodiment, since the discharge amount of exhaust gas and waste water itself can be suppressed to the limit, there is an excellent effect of improving the work environment and facilitating maintenance of environmental measures. Therefore, the present invention has an extremely large industrial value as an exhaust gas purification device for a surface treatment tank that has solved the conventional problems.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part illustrating an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Surface treatment tank, 11 Upper opening part, 12 Processing liquid, 21 Air supply port, 22 Intake port, 23 Airflow, 3 Exhaust casing, 31 Exhaust duct, 4 1st mist removal part, 41 Spray nozzle, 42 Bottom part, 5th 2 mist removal part, 51 mist separator, 51a impeller, 51b motor, 52 storage part.

Claims (2)

The upper opening of the surface treatment tank is provided with an air curtain device for collecting mist generated from the processing liquid by an air flow generated from an air supply port provided on one side toward an air intake port provided on the other side. In addition, a spray nozzle for spraying water to remove mist in the exhaust and filling the casing with mist-like water droplets is disposed in the exhaust casing following the air inlet of the air curtain device. A first mist removing unit having a bottom for storing the mist-like water droplets that have been absorbed and lowered, and a mist separator that separates and removes the mist that has not been removed by the first mist removing unit at the subsequent stage; The impeller is composed of an impeller and a motor that rotates the impeller. The impeller sucks exhaust air from the first mist removing section, and the impeller collects mist in the exhaust gas, and further collides with the inner wall surface by centrifugal force. And having a reservoir that collects and flows down along the wall surface and stores the exhaust, and supplies the exhaust from which the mist has been separated and removed to the air supply port to form an air curtain airflow and circulate use An exhaust gas purification apparatus for a surface treatment tank, characterized in that a second mist removing section is provided. The mist-containing water collected at the storage bottom of the first mist removal unit is supplied to a spray nozzle for circulation, and the liquid mist collected at the storage unit of the second mist removal unit is used as the surface treatment tank. The exhaust gas purification apparatus for a surface treatment tank according to claim 1, wherein the exhaust gas purification apparatus is returned to the surface treatment tank.

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