JPH1066818A - Dust collecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the lowering of the capacity of a mist catcher caused by clogging and to also facilitate maintenance by providing a spray device spraying fine liquid droplets bonding dust with a relatively small particle size and the mist catcher flocculating fine liquid droplets to which dust is bonded to make them coarse. SOLUTION: Gas containing dust with a relatively fine particle size not separated and collected by a cyclone 2 is introduced into a housing 5 through a dust passage 4. The dust with the relatively fine particle size introduced into the housing 5 is bonded to fine liquid droplets sprayed from a spray device 6 to fall under its own wt. and the gas and the liquid droplets are separated by a mist catcher 7 and the clean gas is sent to the outside of this apparatus under pressure through a clean gas discharge passage 8. The liquid droplets separated by the mist catcher 7 are flocculated by a wire mesh without generating clogging to become large liquid droplets which in turn fall to a water receiving tank under the own wt. of them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is suitable for collecting dust in a gas such as incineration ash or fly ash, which has the same composition and is widely mixed from small to large particles. A simple dust collector.

[0002]

2. Description of the Related Art Conventionally, as a device for separating and collecting dust from a dust-containing gas in which dust having a relatively large particle size and dust having a relatively small particle size are mixed, conventionally, a spray device is used. There is known a cleaning type dust collector that allows a dust-containing gas to pass through a mist atmosphere.

[0003] In this conventional cleaning type dust collector, dust in a dust-containing gas can be attached to finely sprayed droplets to separate the dust from the gas. It is difficult to effectively separate and collect the above-mentioned gas from the above gas, and as a result, there is a problem that the apparatus is complicated and the cost is high.

That is, in the above-mentioned conventional cleaning type dust collecting apparatus, for example, even if the droplets on which dust adheres are separated by a mist catcher, they are dispersed again in the gas or adhered to the droplets. Dust adheres to and accumulates on the mist catcher, which tends to cause performance degradation due to clogging. Frequent inspection and cleaning work is required, so that maintenance work is very complicated.

The present invention has been made in view of the above situation, and has as its object the purpose of being able to separate and collect dust with high efficiency by means of dust separation and collection according to the particle size. In addition, it is an object of the present invention to provide a dust collection device that effectively prevents performance degradation due to clogging of a mist catcher and that is easy to maintain.

[0006]

In order to achieve the above object, according to the present invention, a dust collecting apparatus is provided with a cyclone for separating and collecting dust having a relatively large particle size and a cyclone passing through the cyclone. And a mist catcher for agglomerating and coarsening the fine droplets to which the relatively small-sized dust is adhered. It is a feature.

In the present invention, it is preferable that the mist catcher is formed of a wire mesh having a thickness of 0.1 mm or less and a width of 0.5 mm.

[0008] In addition, in the present invention, it is desirable that the mist catcher has a filled porosity of 90 to 95%.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the accompanying drawings.

As shown in FIG. 1, the dust collector according to this embodiment is a dust flow path for supplying a dust-containing gas in which dust having a relatively large particle size and dust having a relatively small particle size are mixed. 1, a cyclone 2 communicatively connected downstream of the dust flow path 1, a dust hopper 3 detachably attached to the lower end of the cyclone 2, and one end connected to an upper portion of the cyclone 2 A dust channel 4, a housing 5 connected to the other end of the dust channel 4,
A spraying device 6 disposed at an upper part in the housing 5;
A mist catcher 7 disposed in the housing 5 and below the spray device 6, a clean gas supply flow path 8 that is connected to a lower portion of the housing 5 and below the mist catcher 7, A water receiving tank 9 is provided at the lower end of the housing 5, and a circulating water pump 10 for pressure-feeding the water in the water receiving tank 9 to the spray device 6. Of course, in the dust collector, although not shown, devices necessary for operation and safe operation, such as a power supply, operation switches, and display devices, are disposed at appropriate positions.

The gas supplied to the cyclone 2 through the dust flow path 1 may be a mixture of dust having different compositions, resulting in a mixture of dust having a large particle diameter and small dust. , Like incinerated ash and fly ash, the particle size is, for example, 1.0 μm
Gases from fine to large, ranging from the following to 100.0 μm or more, are supplied in a mixed manner. The supply wind speed is, for example, 5 m / sec to 15 m / sec.
sec.

The cyclone 2 separates dust having a relatively large particle size, for example, large and heavy dust such as 10 μm to 100 μmm from a gas. The principle of the separation is known. Will be omitted.

The dust hopper 3 is for storing dust having a relatively large particle diameter separated and collected by the cyclone 2 by dropping under its own weight. When the dust hopper 3 becomes full, it is replaced with an empty one.

The dust flow path 4 is a flow path for introducing dust having a relatively small particle size that could not be separated by the cyclone 2 into the housing 5.

The housing 5 is formed of a closed casing that does not leak liquid.
A door (not shown) for attaching / detaching the mist cachet 7 is formed to be freely openable and closable.

The spray device 6 applies fine droplets (mist) from a nozzle to the housing 5 from above the housing 5.
It is configured to diffuse and spray so as to spread throughout the inside. The configuration of the spray device 6 is the same as that of a known device, and a detailed description thereof will be omitted.

The mist catcher 7 has a thickness of 0.1 mm.
A wire mesh of 1 mm or less and a width of 0.5 mm is filled at random, and the filled porosity is 9
It is set to 0 to 95%.

The thickness of the wire mesh is desirably formed as thin as possible in consideration of strength and durability.
The width is desirably determined relatively from the inertial collision distance of the water droplets to which the dust adheres and the blockage of the dust.
As shown in the following, it can be obtained from the general relationship between the specific surface area of dust, the collection rate of water droplets, and the gas passage resistance.

As shown in FIG. 3, when the filling porosity of the wire mesh is 90% or less, dust adheres and grows, so that the gas ventilation resistance is large and the suction ability is reduced. In addition, when the filling porosity of the wire mesh is 95% or more, the rate at which dust is collected by water droplets in this filling layer decreases, and the collection rate decreases.

The clean gas supply flow path 8 is for sending the clean gas from which the droplets have been separated by the mist catcher 7 to the outside of the apparatus.

The water receiving tank 9 receives contaminated liquid droplets collected by the mist catcher 7 and condensed and coarsened to receive the sewage dropped by its own weight. The water receiving tank 9 is exchangeably mounted.

The circulating water pump 10 circulates the sewage collected in the water receiving tank 9 at a constant sewage concentration and sends the sewage to the spraying device 6 under pressure. The water is drained, and the amount of this drain is made up.

Since the dust collecting apparatus according to this embodiment is configured as described above, dust having a relatively large particle size and dust having a relatively small particle size are mixed through the dust passage 1. The dust-containing gas is introduced into the cyclone 2, where relatively large-sized dust is separated and collected from the gas, and the separated and collected relatively large-sized dust is transferred to the dust hopper 3. And fall under their own weight and are stored.

On the other hand, a gas containing dust having a relatively small particle size that has not been separated and collected by the cyclone 2 is introduced into the housing 5 through the dust flow path 4.

The dust having a relatively small particle diameter introduced into the housing 5 adheres to fine droplets sprayed from the spraying device 6 and falls by its own weight. Is separated, and the clean gas is pumped to the outside of the apparatus through the clean gas supply passage 8.

On the other hand, the droplets separated by the mist catcher 7 are aggregated by the wire mesh without being clogged into large droplets, and fall into the water receiving tank 9 by their own weight. Therefore, in this embodiment, since the wire mesh is hardly clogged, frequent inspection and cleaning work are not required, and maintenance work is greatly simplified.

The sewage stored in the water receiving tank 9 is
Since the sewage water is adjusted to a certain concentration and is pressure-fed to the spraying device 6 via the circulating water pump 10 and reused, the running cost can be reduced.

[0028]

As described above, according to the present invention, dust can be separated and collected with high efficiency by the dust separating and collecting means according to the particle diameter, and the performance of the mist catcher can be reduced due to clogging. Can be effectively prevented,
Moreover, many excellent effects such as easy maintenance can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a dust collector according to an embodiment of the present invention.

FIG. 2 is a graph showing a general relationship between the specific surface area of dust, the collection rate of water droplets, and the gas passage resistance.

FIG. 3 is a graph showing a relationship between a filling porosity of a wire mesh and a collection rate.

[Explanation of symbols]

 2 Cyclone 6 Spray device 7 Mist catcher

Claims (3)

[Claims] A cyclone for separating and collecting dust having a relatively large particle diameter; a spraying device for spraying fine droplets for adhering dust having a relatively small particle diameter passing through the cyclone; A mist catcher configured to agglomerate and coarsen fine droplets having small-diameter dust attached thereto. 2. The mist catcher according to claim 1, wherein said mist catcher has a thickness of 0.1 mm.
The dust collector according to claim 1, wherein the dust collector is formed of a wire mesh having a width of 1 mm or less and a width of 0.5 mm. 3. The dust collector according to claim 1, wherein the mist catcher has a filling porosity of 90 to 95%.