JP3989614B2 - Effluent device for washing wastewater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for evaporating cleaning wastewater generated in a cleaning booth of a painting facility including a pretreatment facility for coating that performs pretreatment such as degreasing and chemical conversion.
[0002]
[Prior art]
The cleaning wastewater generated at the cleaning booth of the painting equipment contains chemical pollutants, paint mist, metal fine particles and other environmental pollutants and cannot be discharged as it is to the external environment. Conventionally, cleaning wastewater generated in a cleaning booth of a painting facility is led to the outside of the cleaning booth and connected to a sealed evaporation chamber and an evaporation chamber as disclosed in, for example, JP-A-8-218189. An air supply duct, an exhaust duct connected to the evaporation chamber, an exhaust fan connected to the exhaust duct, and an air flow path extending between the supply duct and the exhaust duct formed in the evaporation chamber The cleaning wastewater atomizer disposed in the air flow path, the mist removing device disposed in the middle of the air flow path and downstream of the most downstream cleaning wastewater atomizer, and the cleaning wastewater collected on the floor of the evaporation chamber Is supplied to a washing waste water evaporation device comprising a reflux device for refluxing the washing water to the washing water atomization device and a washing waste water supply device for additionally supplying washing waste water to the washing waste water being refluxed, and is concentrated by evaporating moisture, Then detoxification treatment Which had been the external environment F emissions thereafter.
[0003]
[Problems to be solved by the invention]
The conventional evaporator disclosed in Japanese Patent Application Laid-Open No. 8-218189 requires installation of a pipe, an atomizer, an evaporation chamber, etc. for leading the washing wastewater from the washing booth of the painting equipment, which reduces the construction cost of the painting equipment. There was a problem of soaring.
This invention is made | formed in view of the said problem, and it aims at providing the evaporation apparatus of the washing waste water which does not raise the construction cost of a coating equipment.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, a washing booth of a painting facility having a washing water injection device for injecting washing water toward an object to be washed , an air supply duct connected to the washing booth, a washing booth An exhaust duct connected to the exhaust duct, an exhaust fan connected to the exhaust duct, and a mist removing device disposed in the cleaning booth and in the vicinity of the connection portion of the exhaust duct. The cleaning water sprayed from the cleaning water jetting device collides with the object to be cleaned and is brought into contact with the cleaning wastewater mist formed by crushing, thereby cleaning the water in the cleaning wastewater mist. A cleaning waste water evaporation device characterized in that it is evaporated in the booth and humidified air is passed through a mist removal device to remove the concentrated cleaning waste water mist, and is discharged to the external environment through an exhaust duct. Offer That.
[0005]
In the cleaning apparatus for cleaning waste water according to the present invention, the cleaning water sprayed from the spraying device collides with the surface of the object to be cleaned in the cleaning booth of the painting facility, and the chemicals and metals adhered to the surface of the object to be cleaned. Wash away fine particles. The cleaning water that has flowed down from the surface of the object to be cleaned to the floor of the cleaning booth becomes cleaning wastewater containing environmental pollutants such as chemicals and metal fine particles. A portion of the cleaning water that collides with the surface of the object to be cleaned is crushed by the collision and becomes a mist of cleaning wastewater containing chemical pollutants, metal fine particles, paint mist, and other environmental pollutants, and fills the cleaning booth.
[0006]
Air is supplied to the washing booth of the painting facility through the air supply duct. The air supplied to the inside of the cleaning booth comes into contact with the mist of the cleaning wastewater that fills the cleaning booth to evaporate the water in the mist. The air that has been humidified by absorbing moisture in the mist is discharged to the outside environment through the exhaust duct after the mist from the cleaning wastewater is removed through the mist removing device.
[0007]
The mist of the cleaning wastewater concentrated by evaporation of water adheres to the mist removal device, the ceiling and side walls of the cleaning booth, and aggregates and falls as water droplets onto the floor of the cleaning booth, or as a water stream as the cleaning booth. Flows down to the floor. The cleaning wastewater collected on the floor of the cleaning booth is concentrated by concentrating the cleaning wastewater mist. The concentrated cleaning wastewater is taken out from the cleaning booth, detoxified, and discharged to the external environment.
[0008]
If the cleaning apparatus for cleaning wastewater according to the present invention is used, the cleaning wastewater is concentrated in the cleaning booth of the painting facility. There is no need to install a conduit, an atomizer, an evaporation chamber, etc. Therefore, the construction cost of the painting equipment does not rise.
[0009]
In a preferred aspect of the present invention, the evaporation apparatus includes a buffer chamber that temporarily stores the air supplied from the air supply duct.
By temporarily storing the air supplied from the air supply duct in the buffer chamber and discharging it from the buffer chamber, the air flow is rectified, and the flow velocity distribution of the air flow flowing in the cleaning booth becomes uniform. As a result, the mist of the cleaning wastewater filling the cleaning booth uniformly contacts the air flow, the evaporation of the water in the mist is promoted, and the water evaporation performance of the evaporation device is improved.
[0010]
In a preferred embodiment of the present invention, high temperature steam is supplied to the air supply duct.
In a preferred embodiment of the invention, hot factory exhaust is supplied to the air supply duct.
In a preferred embodiment of the present invention, the cleaning wastewater evaporation apparatus includes a supply air heating apparatus.
By increasing the supply air temperature, the evaporation of moisture in the mist of the washing water is promoted, and the moisture evaporation performance of the evaporator is improved.
[0011]
In a preferred embodiment of the present invention, the air supply duct is connected to one side of the ceiling part of the cleaning booth, and the exhaust duct is connected to the other side of the ceiling part of the cleaning booth.
By connecting the air supply duct to one side of the ceiling of the washing booth and the exhaust duct to the other side of the ceiling of the washing booth, an air flow with a long U-shaped path in the washing booth The cleaning water mist filling the cleaning booth can be uniformly exposed to the air flow. As a result, the water evaporation performance of the evaporator is improved.
[0012]
In a preferred embodiment of the present invention, the cleaning waste water evaporation apparatus further includes an evaporation apparatus for evaporating water in the cleaning waste water discharged from the cleaning booth of the painting facility.
By further providing an evaporator for evaporating the water in the cleaning wastewater discharged from the cleaning booth of the painting facility, the concentration of the cleaning wastewater can be further increased. Thereby, the apparatus for a detoxification process can be reduced in size.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Examples of the present invention will be described below.
As shown in FIG. 1, a cleaning booth 1 of a degreasing treatment facility extends in a tunnel shape in a direction perpendicular to the paper surface of FIG. The cleaning booth 1 is connected to a degreasing booth (not shown) of the degreasing processing facility. An overhead conveyor 2 disposed in the center of the ceiling of the degreasing booth and the cleaning booth 1 extends in a direction perpendicular to the paper surface of FIG. A hanger 3 for conveying an object to be processed is suspended from the overhead conveyor 2. The overhead conveyor 2 is surrounded by a surrounding wall 4 extending in a direction perpendicular to the paper surface of FIG. A slit 4a extending in a direction perpendicular to the paper surface of FIG. 1 is formed in the bottom wall of the surrounding wall 4, and the hanger 3 extends downward through a brush 5 implanted in a side edge of the slit 4a. A cleaning water conduction conduit 6 disposed at the lower center of the cleaning booth 1 extends in a direction perpendicular to the paper surface of FIG. A washing water jet nozzle 7 branched from the washing water conducting pipe 6 extends upward along both side walls of the washing booth 1. A plurality of washing water injection nozzles 7 branch from the washing water conducting pipe 6 at a predetermined interval in a direction perpendicular to the paper surface of FIG.
[0014]
The bottom wall of the surrounding wall 4 is extended toward one side wall of the cleaning booth 1, and a buffer chamber 8 extending in a direction perpendicular to the paper surface of FIG. ing. A slit 8 a extending in a direction perpendicular to the paper surface of FIG. 1 is formed on the side of the bottom wall of the buffer chamber 8 adjacent to the one side wall of the cleaning booth 1. An air supply duct 9 is connected to the upper part of the one side wall of the cleaning booth 1 constituting the side wall of the buffer chamber 8 and to the central part in the length direction of the side wall. The air supply duct 9 is connected to a draining drying furnace (not shown) of the painting facility. A branch duct (not shown) branched from the air supply duct 9 extends to the outside. An air supply fan 10 is disposed in the air supply duct 9.
An exhaust duct 11 is connected to the upper part of the other side wall of the cleaning booth 1 and to both ends in the length direction of the side wall. An exhaust fan 12 is disposed in the air supply duct 11.
A mist removing device 13 disposed in the cleaning booth 1 and in the vicinity of the exhaust duct 11 extends in a direction perpendicular to the paper surface of FIG. A punching metal 14 disposed immediately below the mist removing device 13 extends in a direction perpendicular to the paper surface of FIG.
[0015]
The operation of the washing waste water evaporation apparatus according to this embodiment having the above-described configuration will be described.
The workpiece A suspended on the hanger 3 is immersed in a degreasing solution in a degreasing booth (not shown) and degreased. The degreased workpiece A is conveyed to the cleaning booth 1 connected to the degreasing booth. In the cleaning booth 1, the cleaning water sprayed from the cleaning water spray nozzle 7 collides with the surface of the object A to be cleaned, and the degreasing liquid, metal fine particles, etc. adhering to the surface of the object A to be cleaned are washed away. The washing water that has flowed down from the surface of the object A to be washed to the floor of the washing booth 1 becomes washing waste water containing environmental contaminants such as a degreasing treatment liquid and metal fine particles. A part of the cleaning water colliding with the surface of the object A to be cleaned is crushed by the collision, and becomes a mist of cleaning wastewater containing environmental pollutants such as a degreasing liquid and metal fine particles, and fills the cleaning booth 1.
[0016]
A mixed air of high-temperature exhaust and outside air in a drainage drying furnace (not shown) of the painting facility is pumped by the air supply fan 10 and supplied to the buffer chamber 8 through the air supply duct 9. The hot air once accumulated in the buffer chamber 8 passes through the slit 8a, and blows out downward as an air flow having a uniform velocity distribution in the direction perpendicular to the paper surface in FIG. A high-temperature air flow having a uniform velocity distribution blown downward from the slit 8a descends along one side wall of the cleaning booth 1 and rises along the other side wall as shown by arrows in FIG. While the hot air flow descends and rises through the U-shaped path, it contacts the mist of the cleaning wastewater filling the cleaning booth 1 to evaporate the water in the mist. The air flow that has been humidified by absorbing moisture in the mist is passed through the punching metal 14 to remove water droplets having a large particle size from the washing waste water, and further through the mist removing device 13 to remove the mist from the washing waste water. Then, it is discharged into the external environment through the exhaust duct 11 and the exhaust fan 12.
[0017]
The cleaning wastewater mist concentrated by the evaporation of water adheres to the punching metal 14, the mist removing device 13, the ceiling and the side wall of the cleaning booth 1, and aggregates and falls into the floor of the cleaning booth 1 as water droplets. Alternatively, the water flows down to the floor of the cleaning booth 1. The cleaning wastewater collected on the floor of the cleaning booth 1 is concentrated by concentrating the cleaning wastewater mist. The concentrated cleaning wastewater is taken out from the cleaning booth 1, detoxified, and then discharged to the external environment.
[0018]
If the cleaning wastewater evaporator is used in the present embodiment, the cleaning wastewater is concentrated in the cleaning booth 1, so that the pipe, the atomizing device, the evaporation chamber, etc. for leading the cleaning wastewater from the cleaning booth 1 as in the past. Need not be installed separately. Therefore, the construction cost of the painting equipment does not rise.
[0019]
In the evaporation apparatus according to the present embodiment, the air supplied from the air supply duct 9 is temporarily accumulated in the buffer chamber 8 and blown out from the buffer chamber 8 through the slit 8a. The flow velocity distribution in the direction perpendicular to the paper surface in FIG. As a result, the mist of the cleaning wastewater filling the cleaning booth 1 uniformly contacts the air flow, the evaporation of the water in the mist is promoted, and the water evaporation performance of the evaporator is improved. If the buffer chamber 8 is not provided, a high-speed air flow is generated in the cleaning booth 1 in the vicinity of the air supply duct 9 and in the vicinity of the exhaust duct 11, but air tends to stagnate in other parts. Therefore, the mist of the cleaning wastewater filling the cleaning booth 1 is not uniformly exposed to the air flow, and the evaporation of moisture in the mist is not sufficiently promoted. As a result, the water evaporation performance of the evaporator is reduced.
[0020]
In the evaporator according to the present embodiment, the high-temperature exhaust gas from the draining drying furnace was supplied to the air supply duct 9, so that the evaporation of moisture in the mist of the cleaning wastewater was promoted, and the moisture evaporation performance of the evaporator was improved. Supplying the high-temperature exhaust gas from the drainage drying furnace to the air supply duct 9 has an advantage that high-temperature air can be supplied to the evaporation device without adding a separate heating device.
[0021]
In the evaporation apparatus according to the present embodiment, the air supply duct 9 is connected to one side portion of the ceiling portion of the cleaning booth 1, and the exhaust duct 11 is connected to the other side portion of the ceiling portion of the cleaning booth 1. An air flow having a long U-shaped path length was formed in the cleaning booth 1, and the mist of the cleaning water filling the cleaning booth 1 was evenly exposed to the air flow, thereby improving the water evaporation performance of the evaporator.
[0022]
As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example.
The cleaning wastewater evaporation apparatus according to the present invention may be applied to a cleaning booth of other pre-painting processing equipment such as a chemical conversion processing equipment, a cleaning booth of a coating equipment performing a coating process, and the like.
Instead of the high-temperature exhaust of the draining drying furnace, other high-temperature factory exhaust such as a high-temperature exhaust of a baking drying furnace of a painting facility or a high-temperature exhaust of a boiler may be supplied to the air supply duct 9. High temperature steam may be supplied to the air supply duct. A supply air heating device such as a burner or an electric heater may be separately installed.
You may add the evaporator which evaporates the water | moisture content in the washing | cleaning wastewater discharged | emitted from the washing | cleaning booth of a coating equipment like the Unexamined-Japanese-Patent No. 8-218189 etc. to the evaporation apparatus which concerns on the said Example. By adding an evaporator as disclosed in JP-A-8-218189, the concentration of the washing wastewater can be further increased. Thereby, the apparatus for a detoxification process can be reduced in size.
[0023]
【The invention's effect】
As described above, in the cleaning apparatus for cleaning wastewater according to the present invention, the cleaning wastewater is concentrated in the cleaning booth of the painting facility. There is no need to install pipes, atomizers, evaporating chambers, etc., for leading cleaning wastewater from Therefore, the construction cost of the painting equipment does not rise.
[0024]
By temporarily storing the air supplied from the air supply duct in the buffer chamber and discharging it from the buffer chamber, the air flow is rectified, and the flow velocity distribution of the air flow flowing in the cleaning booth becomes uniform. As a result, the mist of the cleaning wastewater filling the cleaning booth uniformly contacts the air flow, the evaporation of the water in the mist is promoted, and the water evaporation performance of the evaporation device is improved.
[0025]
If the supply air is heated to a high temperature by supplying high-temperature steam to the supply air duct, supplying high-temperature factory exhaust to the supply air duct, or installing a supply air heating device, the water evaporation performance of the device is improved. To do.
[0026]
By connecting the air supply duct to one side of the ceiling of the cleaning booth and connecting the exhaust duct to the other side of the ceiling of the cleaning booth, a long U-shaped air flow in the cleaning booth The mist of the cleaning water filling the cleaning booth is evenly exposed to the air flow. As a result, the water evaporation performance of the apparatus is improved.
[0027]
By further providing an evaporator for evaporating the water in the cleaning wastewater discharged from the cleaning booth of the painting facility, the concentration of the cleaning wastewater can be further increased. Thereby, the apparatus for a detoxification process can be reduced in size.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an apparatus for evaporating cleaning wastewater according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Washing booth 2 Overhead conveyor 3 Hanger 4 Enclosure 4a Slit 5 Brush 6 Washing water conduction pipe 7 Washing water injection nozzle 8 Buffer chamber 8a Slit 9 Supply air duct 10 Supply air fan 11 Exhaust duct 12 Exhaust fan 13 Mist removal device 14 Punching metal

Claims (7)

A washing booth of a painting facility having a washing water injection device for injecting washing water toward an object to be washed, an air supply duct connected to the washing booth, an exhaust duct connected to the washing booth, and an exhaust duct Provided with an exhaust fan and a mist removing device disposed in the cleaning booth and in the vicinity of the connection portion of the exhaust duct. Air is supplied to the cleaning booth through the air supply duct and injected from the cleaning water injection device. The cleaning water collides with the object to be cleaned and the air is brought into contact with the mist of the cleaning wastewater formed to evaporate the water in the cleaning wastewater mist in the cleaning booth. An apparatus for evaporating cleaning wastewater, wherein the cleaning wastewater mist concentrated through a removal device is removed and discharged to the outside environment through an exhaust duct . The apparatus for evaporating cleaning wastewater according to claim 1, further comprising a buffer chamber for temporarily storing air supplied from the air supply duct. The apparatus for evaporating cleaning wastewater according to claim 1 or 2, wherein high-temperature steam is supplied to the air supply duct. 3. The apparatus for evaporating cleaning wastewater according to claim 1, wherein high-temperature factory exhaust is supplied to the air supply duct. The cleaning wastewater evaporation apparatus according to claim 1, further comprising a supply air heating device. 6. The air supply duct is connected to one side portion of the ceiling portion of the cleaning booth, and the exhaust duct is connected to the other side portion of the ceiling portion of the cleaning booth. 2. An apparatus for evaporating cleaning wastewater according to claim 1. The evaporation apparatus for cleaning wastewater according to any one of claims 1 to 6, further comprising an evaporation device for evaporating water in the cleaning wastewater discharged from the cleaning booth of the painting facility.

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