JPH09201510A - Method for wet dust collection and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the humidity increase in purified air discharged from an air outlet by mixing ethylene glycol into water to be mixed and brought into contact with dust. SOLUTION: Air containing dust is supplied to a dust removing channel 11 and mixed and brought into contact with the mixed solution of fog-shaped water and ethylene glycol while ascending in the channel 11. In this process, relatively heavy dust drops into a liquid tank 2 with the mixed solution. When the dust and the mixed solution pass through a dust removing filter 21 between partition plates 9, 10, most of the dust is removed and most of the mixed solution is adsorbed by the filter 21. By passing through the filter 21 of fine meshes between the partition plate 10 and a side plate 4b, air which passed through the filter 21 and was nearly purified is discharged outside an apparatus as purified air. The dust which dropped into the tank 2 precipitates by its own weight, is transferred by a discharge conveyer 16, and is received by a dust collecting box 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet dust collecting method and apparatus for removing dust after spraying a liquid on air containing dust.

[0002]

2. Description of the Related Art A device for processing metal, particularly a cutting device and a grinding device, is provided with a dust collecting device for collecting dust generated from these devices. When exhausting the wind out of the work room, the dust collector must be fixedly installed on the floor of the work room, etc., and the exhaust duct must be extended to the outside of the work room. Since it is bad and costly, a dust collector that discharges the exhaust air into the working chamber is usually used. Hereinafter, the dust collector will be described with reference to FIG.

Reference numeral 50 denotes a so-called dry dust collector, which is formed with a partition wall 51 having a plurality of ventilation ports 55 as a boundary, a lower part thereof being a dust collecting chamber 52, and an upper part being a clean air chamber 53. . In the dust collection chamber 52, a dust suction duct 54 that communicates with a metal processing device (not shown), a filter 56, and a collection box 57 for collecting dust that has fallen from the filter 56.
The clean air chamber 53 is provided with an exhaust port 58 for discharging the air that has passed through the filter 56, a suction fan 59, and a motor 60 for driving the suction fan 59. Then, by driving the suction fan, the air containing dust from the metal working device is sucked into the dust collecting chamber 52 through the dust suction duct 54, and after the dust is removed by the filter 56, the ventilation port 55 is provided. The purified air is discharged to the outside of the apparatus through the clean air chamber 53 and the exhaust duct 58 as purified air.

However, since the dust generated from the metal cutting device contains sparks (very high temperature metal powder) generated by the cutting work, the sparks are sucked into the dust collecting chamber of the dust collecting device. If there is a risk that the filter will be damaged or a fire will occur in the dust collection chamber, and if the dust generated by cutting the iron is collected after collecting the fine powder such as metal aluminum, There was a problem that there was a risk of causing a dust explosion.

On the other hand, as a device capable of solving the above-mentioned problems, there is a so-called wet dust collecting device which removes dust after spraying water on the dust. Since the humidity inside the equipment is rising due to the evaporation of water inside the equipment, the clean air discharged from the exhaust port becomes high humidity air, which raises the humidity inside the work room and makes the environment inside the work room unpleasant. In addition, there is a problem that it adversely affects peripheral devices and the like, and in order to solve this problem, it was necessary to attach a humidity control device or the like to the wet dust collector.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, the present invention suppresses an increase in humidity in a wet dust collector so that clean air exhausted from an exhaust port can be provided without attaching a humidity controller or the like. A technical object is to provide a wet dust collecting method and apparatus capable of suppressing an increase in humidity.

[0007]

In order to solve the above-mentioned problems, the present invention mixes ethylene glycol with water to be mixed and contacted with dust.

[0008] Further, technical means has been taken in which water is sprayed on air containing dust, and a mixed solution of ethylene glycol is sprayed on the water from a spray nozzle for mixing and contacting the dust and water.

[0009]

[Action and effect] Since ethylene glycol has a higher boiling point and viscosity than water, the mixed solution of ethylene glycol and water has a higher boiling point and viscosity than water, and the higher boiling point lowers the evaporation of the mixed solution. To do. Moreover, since the viscosity is high, the particle size of the droplets is larger than when water is sprayed, and the time to stay in the air is shortened,
Since the surface area per unit volume is small, the evaporation rate is low. As described above, since the mixed solution of ethylene glycol and water has a lower evaporation rate and evaporation rate than water, even when the mixed solution is sprayed on air containing dust and mixed contact is made with the dust. The increase in humidity of the air can be suppressed, and therefore, the increase in humidity of the clean air discharged from the exhaust port can be suppressed without attaching a heat treatment device or the like.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of the wet dust collector of the present invention. Reference numeral 1 denotes a wet dust collector, the lower part of which is formed as a liquid tank 2 for storing a liquid for spraying, and the upper part of the liquid tank 2 is formed as a dust collecting chamber 3.
The spraying liquid is a mixed solution of water and a so-called antifreeze solution containing ethylene glycol as a main component, which is generally used for freeze prevention of cooling water for a liquid-cooled internal combustion engine and corrosion protection of a cooling mechanism.

An air suction port 5 is opened at the lower part of one side plate 4a of the dust collection chamber 3, and a dust suction duct 6 communicating with a dust generation source such as a metal cutting device (not shown) is connected to the air suction port 5. However, the exhaust port 8 is provided on the top plate 7 on the other side plate 4b side of the dust collection chamber 3.
And the suction port 20 of the suction fan 19 is connected to the exhaust port 8. A partition plate 9 extending from below the liquid surface of the liquid to the vicinity of the top plate 7 is provided on the side plate 4a side of the dust collecting chamber 3, and a partition plate 10 extending from the top plate 7 to the vicinity of the liquid tank 2 is provided on the side plate 4b side.
By providing the above, the dust collection chamber 3 is formed in the dust removal channel 11 for circulating the air containing dust. A dust removal filter 21 is provided in the dust removal passage 11 between the partition plates 9 and 10.
And a dust removal channel 11 between the partition plate 10 and the side plate 4b.
Is provided with a dust removing filter 22 having a finer mesh than the dust removing filter 21. Then, a plurality of spray nozzles 12 are arranged in the dust removal flow path 11 between the air suction port 5 and the dust removal filter 21.

A liquid suction pipe 13 is inserted into the liquid tank 2, and the liquid suction pipe 13 communicates with a liquid supply pipe 15 of the spray nozzle 12 via a pump 14. At the bottom of the liquid tank 2, a discharge conveyor 16 that conveys the precipitated dust to the outside of the apparatus is installed horizontally, and a dust storage box 18 is installed below the drop gutter 17 of the discharge conveyor 16.

Next, the operation of the above configuration will be described.

When the pump 14 is started, the mixed solution in the liquid tank 2 is sprayed from the liquid suction pipe 13 through the liquid supply pipe 15 to the spray nozzle 12
Is supplied to the dust removal passage 11 from the air suction port 5 to the dust removal filter 21 and is sprayed.

By driving the suction fan 19, the air containing dust from the dust generating source passes through the dust suction duct 6 and the suction port 5
Is supplied to the dust removal passage 11 between the side plate 4a and the partition plate 9, and the dust in the air is mixed and brought into contact with the atomized mixed solution while rising in the dust removal passage 11. At this time, the relatively heavy dust falls into the liquid tank 2 together with the mixed solution. When the dust and the mixed solution pass through the dust removing filter 21 between the partition plate 9 and the partition plate 10, the dust is almost removed and the mixed solution is almost adsorbed by the dust removing filter 21. Then, the substantially purified air that has passed through the dust removal filter 21 passes through the fine dust removal filter 22 between the partition plate 10 and the side plate 4b, so that some fine dust and mixed solution are removed. Then, the clean air is discharged to the outside of the apparatus through the exhaust port 8 and the suction port 20 of the suction fan 19. The mixed solution adsorbed on the dust removing filters 21 and 22 becomes a drop, and a part of dust is included and drops from the dust removing filters 21 and 22 into the liquid tank 2.

The dust that has fallen into the liquid tank 2 is settled by its own weight, and the settled dust is conveyed by the discharge conveyor 16,
It is discharged from the drop gutter 17 and stored in the dust storage box 18. In addition, the mixed solution is supplied by the pump 14 to the spray nozzle 1
It is supplied to No. 2 and recycled.

Incidentally, hygrometers were attached to the air intake port and the air exhaust port of the wet dust collector of this embodiment, and a mixed solution of water and a commercially available antifreeze was used as the liquid for spraying, and the case of using water. As a result of measuring the increase in humidity with water, when water is used, the difference in humidity between the intake air and the exhaust air is about 10%.
When the mixed solution was used, the humidity difference was 2-3%.

[Brief description of drawings]

FIG. 1 is a side sectional view of a wet dust collector of the present invention.

FIG. 2 is a side sectional view of a conventional dry dust collector.

[Explanation of symbols]

 1 Wet Dust Collection Device 2 Liquid Tank 3 Dust Collection Chamber 4 Side Plate 5 Air Suction Port 6 Dust Collection Duct 7 Top Plate 8 Exhaust Vent 9 Partition Plate 10 Partition Plate 11 Dust Removal Flow Path 12 Spray Nozzle 13 Liquid Suction Pipe 14 Pump 15 Liquid Supply Pipe 16 Discharge conveyor 17 Drop trough 18 Dust storage box 19 Suction fan 20 Suction port 21 Dust removal filter 22 Dust removal filter

Claims (2)

[Claims] 1. A wet dust collecting method in which water is sprayed on air containing dust to bring the dust and water into mixed contact, and then the dust is removed from the air, wherein ethylene glycol is mixed with the water. Wet dust collecting method characterized by the following. 2. An air intake for taking in air containing dust,
A spray nozzle that sprays water into the air to mix and contact the dust and water, a dust filter that removes dust from the air after water spraying, and an exhaust that discharges the air cleaned by the dust filter. A wet dust collecting apparatus comprising a wind nozzle, wherein the spray nozzle is supplied with a mixed solution of the water and ethylene glycol.