JPH0160290B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a gas cleaning device capable of efficiently removing polluted gas containing oil mist, welding fume, harmful gas components, and the like.

(Prior Art) Conventionally, as a device for cleaning contaminated gas containing oil mist, fume, harmful gas components, etc., a pre-coating agent is attached to the surface of a dry filter, and substances in the contaminated gas are removed by the pre-coating layer. A dry filtration type gas purifying device is known that collects harmful gas components to prevent clogging of the filter and absorbs and removes harmful gas components.

It is also known that when there are many pollutants, a wet gas purifier is installed via an intermediate duct as a pre-process to a dry gas purifier. If the pre-coat agent is supplied to the suction side, the higher the performance of the wet gas purifier, the more the pre-coat agent will be collected there, so the only way to supply the pre-coat agent to the dry filter is to supply it into the intermediate duct. However, it has been impossible to compactly integrate a high-performance wet type gas purifying device and a dry filtration type gas purifying device using a precoating agent.

(Problems to be Solved by the Invention) The present invention solves the conventional problems as described above, and provides a high-performance wet gas cleaning device and a dry filtration gas cleaning device using a pre-coating agent. It was completed with the aim of being a gas purifying device that can be integrated into a compact unit without sacrificing its original performance, and can efficiently collect and remove oil mist, fumes, harmful gas components, etc. .

(Means for Solving the Problems) The present invention provides a wet cleaning chamber equipped with a ventilator scrubber and a dry filter by using a partition wall with an eliminator in the form of a plate at the bottom of the casing whose bottom is a liquid reservoir. The dry filtration chamber is divided into a dry filtration chamber with a powder precoat agent container at the bottom and an injection nozzle above it for injecting high pressure air into the precoat agent. This is a characteristic feature.

(Example) Next, the present invention will be described in detail with reference to the illustrated embodiment. Reference numeral 1 is a casing with a liquid reservoir 2 at the bottom, and the liquid reservoir 2 contains water mixed with a surfactant that causes less foaming. is supplied from the water injection valve 3 to a predetermined liquid level. The inside of this casing 1 is partitioned by a partition wall 5 with an eliminator 4 at the bottom, a wet cleaning chamber 7 on the contaminated gas inlet 6 side and a dry filtration chamber 8 on the rear side.
It is divided into. As shown in the figure, the eliminator 4 has baffle plates with a zigzag cross section arranged in parallel to form a curved flow path, and the eliminator 4 has a slight inclination in the front-rear direction of the paper, so that the separated oil is The liquid flows down the groove and falls into the liquid reservoir 2. The lowermost part of the eliminator 4 is a hanging part 9 which is immersed below the liquid surface of the liquid reservoir to prevent contaminated gas from escaping from below the eliminator 4.

In the wet cleaning chamber 7, a plurality of rod-like bodies 10 having, for example, circular, elliptical or polygonal cross-sections are arranged in parallel and close to each other, and the gaps between the rod-like bodies 10 are used as a ventilate, and a spray nozzle 11 is installed above the rod-like bodies 10.
A ventilator scrubber 12 is provided. A circulation pump 13 is installed in the spray nozzle 11.
The water pumped up by the liquid reservoir 2 is supplied and injected toward the rod-shaped body 10. The ventilate scrubber 12 made of such a rod-shaped body 10 can remove oil mist with high efficiency, and has the advantage that its characteristics can be freely changed by changing the type of the rod-shaped body 10 and the gap. However, it goes without saying that other general types of bench ure scrubbers 12 may be used. On the other hand, in the dry filtration chamber 8, a cartridge type dry filter 14 having a folded filtration surface is provided hanging from a partition plate 15. This dry filter 14 is preferably made of a water-resistant filter material such as synthetic fiber, but if a filter material with weak water resistance such as cellulose treated with resin is used, a water repellent such as silicone is applied. to improve water resistance. It is appropriate that the dry filter 14 be folded to have a chrysanthemum-shaped cross section to increase the surface area, but the folded shape is not limited to this. At the bottom of this dry filtration chamber 8, a powdered precoat agent 1 such as calcium carbonate is contained inside.
A shallow pre-coating agent container 17 is provided in which the pre-coating agent 6 is stored, and between the dry filters 14 above it, high-pressure air is injected onto the pre-coating agent 16 to cause the pre-coating agent 16 to fly up into the dry filtration chamber 8. An injection nozzle 18 is provided facing downward.
These injection nozzles 18 are connected to a high pressure air reservoir 19 through a valve 2.
0 and is connected via a high pressure air pipe 21. In addition, 22 is a backwashing ventilate mounted on the top surface of the partition plate 15 facing each dry filter 14, 23 is a nozzle pipe for blowing high-pressure air for backwashing into each ventilee 22, and 24 is a nozzle pipe for sucking purified gas. It is an exhaust fan.

(Function) In this configuration, the contaminated gas inlet 6
The air in the clean room is discharged by the exhaust fan 24 while supplying air from the air outlet to form an air flow as shown by the arrow, and then the valve 20 is opened and high pressure air is injected from the injection nozzle 18. The jet air current flows at several hundred meters per second and exerts a strong shearing action on the precoat agent 16 stored in the precoat agent container 17, causing the precoat agent 16 to fly up into the dry filtration chamber 8. The precoat agent that flies up is carried by the airflow and adheres to the surface of the dry filter 14 to form a precoat layer. After that, if contaminated gas containing welding fume, oil mist, harmful gases, etc. is sent from the contaminated gas inlet 6, the contaminated gas is transferred to a plurality of rod-shaped rods arranged in parallel and close to the ventilate scrubber 12 provided in the wet cleaning chamber 7. When passing through the gap of the body 10 at a high speed of 50 to 100 m/sec, it comes into contact with the water sprayed from the spray nozzle 11 above it, and oil mist with a larger particle size than the welding fume in the contaminated gas is formed. is collected and falls into the liquid reservoir 2 at the bottom of the casing 1. Even if the contaminated gas contains welding sparks, the fire will be extinguished by contact with water in the ventilary scrubber 12, so there is no risk of a fire occurring inside the dust collector. After most of the oil mist has been removed in this way, the contaminated gas then passes through the baffle plate-like eliminator 4 at the bottom of the partition wall 5, but the remaining oil mist collides with the baffle plate due to inertia. The oil mist enters the dry filtration chamber 8 in a state where the oil mist is almost completely removed. The welding fumes in the contaminated gas are efficiently collected by the dry filter 14 provided inside the dry filtration chamber 8 and on which a precoat layer has been formed in advance, and are discharged as clean air from the clean air outlet 19. Ru. The contaminated gas filtered by the dry filter 14 contains almost no oil mist, and the dry filter 1
Since the pre-coat agent is applied to the surface of the filter element 4 in advance, the filter element is not clogged with oil mist, and welding fume can be efficiently collected and removed.

Note that when the filtration resistance of the dry filter 14 gradually increases, high-pressure air for backwashing is blown from the nozzle pipe 23 into the bench lily 22 and dust is brushed off together with the precoat layer. is precoat agent container 1
7, and when high-pressure air is again injected from the injection nozzle 18, the precoat agent with a low specific gravity flies up again and preferentially attaches to the surface of the dry filter 14, and in this way, the precoat agent is circulated many times. will be used. Further, the dry filter 14 is pre-coated again immediately after the dust is brushed off, and the dust collection ability can be restored. In addition,
Although water is used as the cleaning water in this embodiment, other cleaning liquids can also be used. In addition, if there are no solids or mist in the contaminated gas, and the contaminants are only gaseous (e.g. malodorous) components, water or other absorbing liquid is placed in the bottom liquid reservoir, and the pre-coating agent is used to adsorb harmful gas components. It can be composed of an agent. On the other hand, if there are no harmful gas components and the contaminated gas contains only solid matter, mist, etc., the precoat agent will be selected only from the viewpoint of filtration performance.

(Effects of the Invention) As is clear from the above description, the present invention allows a pre-coating agent to be attached to a dry filter in a dry filtration chamber. It is possible to compactly integrate two types of gas purifying devices without impairing the performance of each, and to efficiently collect these substances from contaminated gas containing oil mist, welding fume, etc. , it is possible to pre-coat the surface of a dry filter extremely easily. The present invention also has the advantage that the precoat agent that has fallen without adhering to the surface of the dry filter can be recovered and effectively used. Therefore, the present invention can greatly contribute to the development of industry by solving the problems of conventional gas purifiers of this type.

[Brief explanation of drawings]

The drawings are cross-sectional views showing embodiments of the present invention. 1: Casing, 2: Liquid reservoir, 4: Eliminator, 5: Partition, 7: Wet cleaning chamber, 8: Dry filtration chamber, 12: Ventilation scrubber, 14: Dry filter, 16: Precoat agent, 17: Precoat agent Container, 18: Injection nozzle.

Claims (1)

[Claims] 1 A partition wall 5 having a baffle plate-like eliminator 4 at the bottom of the inside of the casing 1 whose bottom part is a liquid reservoir part 2
A wet cleaning chamber 7 equipped with a ventilate scrubber 12 and a dry filtration chamber 8 equipped with a dry filter 14
A powder pre-coat agent container 17 is provided inside the bottom of the dry filtration chamber 8, and an injection nozzle 18 for injecting high-pressure air into the pre-coat agent is provided above the container. gas cleaning equipment.