KR101311532B1 - cleaning apparatus of bag filter unit - Google Patents

Abstract

According to the present invention, a bag filter unit is provided with a dust collecting device comprising a plurality of bag filter units including a housing provided with a dust room, a bag filter surrounding an outer periphery of a bag cage installed inside the housing, and each of the bag filter units. A venturi tube installed on the upper half to remove dust attached to the bag filter, a supply unit supplying air for cleaning to the venturi tube, the venturi tube having a hollow portion, and the main body; It has a plurality of guide vanes are installed in the longitudinal direction on the inner peripheral surface of the.
The bag filter dedusting device can increase the cleaning efficiency of the cleaning air discharged through the venturi tube.

Description

Cleaning apparatus of bag filter unit

The present invention relates to a dedusting apparatus of a bag filter unit, and more particularly, to a dedusting apparatus of a bag filter unit for removing dust attached to a filter bag of a bag filter unit.

In general, dust collectors have been used to remove soot and dust from exhaust gases such as boilers, furnaces and waste incinerators, and are used in chemical powder manufacturing, steel mills, wood processors, sand blasting plants, paint shops, cement manufacturers and others. It has been used in workplaces where a lot of fine dust is generated. In addition, in the manufacturing industry, it is widely used for improving the quality of products by clean air in IC process, pharmaceutical process and the like.

These dust collectors are divided into mechanical, electrical, dry, or wet depending on the operating method, and simple mechanical structures (for example, gravity settling chamber, impact type dust collector, centrifugal cyclone, etc.) to the size of particles to be removed are about 10 μm. Etc.) may be used. These dry dust collectors have been developed in recent years to collect dust at a relatively low pressure loss of even 1 µm particles due to technology development and structural improvement.However, to collect ultra-fine particles of 1 µm or less, the special structure, pressure loss, and high cost There was a downside to this.

On the other hand, an electrostatic precipitator is used at a large flow rate in which the flow rate of the processing gas is 2,000 to 3,000 m 3 / min or more, and a bag filter, which is one of the filter precipitators, is usually used at a medium and small flow rate below that.

A flutter bag house is one of air pollution prevention devices that filters or prevents emissions of various particulate matter in the atmosphere that causes air pollution, and harmful particles contained in exhaust gases such as factories. The filtration method of these bag filters is a surface filtration method that attaches dust to the surface of a filter material such as thin paper or fiber, and a bag or bag made of a thick layer of filter material such as glass fiber or cotton fiber or bag. There is an internal filtration method that collects dust in the fibrous layer of the filter. In the initial stage of operation, dust is separated only by the filter medium, but the dust layer accumulated on the surface of the filter medium over time serves as a filter medium. As the dust layer acts as a main filtration layer, the collection efficiency is increased, but at the same time, it can act as a resistor that disturbs the gas flow.

Such bag filters usually have an efficiency of 99% or more when the size of the dust is 1.0 μm or more. The principle of dust collection in this device is based on the combined action of collision, direct blocking, surface deposition by electrostatic forces, and diffusion. This dust collection method is one of the excellent dust collection techniques can obtain a high efficiency by properly selecting the filter medium, but when the pores of the filter medium is blocked due to the overload of the pressure loss, the life of the filter medium is shortened and the operating cost may be a factor.

Therefore, if the dust layer on the surface of the filter medium becomes too thick, the pressure loss increases, so after some use, dusting should be performed to shake off the dust. For this purpose, counter-current injection is used, which is divided into intermittent and continuous. The intermittent type divides the dust collecting chamber into 3 ~ 4 pieces to cut off the flow of gas and shake off the dust only where the pressure loss reaches the specified value.The continuous type filters the filter material in sequence while continuing the dust collecting without dividing the dust collecting chamber or blocking the gas. It is a way to shake off the dust.

Dedusting methods include mechanically shaking the filter bag, applying high pressure air in a vibrating or forward direction, and degassing by flowing back air in a direction opposite to the main flow direction of dust.

The previous method has a problem in that the dust collection operation must be temporarily stopped for exhaustion, so a method of flowing backflow has been used recently. In the dedusting operation, the dedusting effect of the filter varies depending on the shape and position of the passage through which the high pressure air is supplied.

Meanwhile, Korean Patent Publication No. 2009-0058689 discloses a venturi coupling device for bag filter dedusting equipment. And the Republic of Korea Utility Model Registration No. 0301507 has a configuration of the protruding venturi.

The posted protruded venturi is mounted on the lower portion of the cage to protrude to the upper portion of the cage to increase the efficiency of use of the media, and has a configuration that can be mounted only by inserting using a multi-stage coupling portion that meets a number of specifications. .

JP 1994-063327 A discloses a filter backwashing device in a powder recovery device. The venturi of the published backwashing device consists of a cylindrical shape that can simply throttle air.

In the above-described devices, the published venturi simply has a cylindrical shape for throttling the injected air, so that it is not possible to increase the injection efficiency of the air for dedusting, and since the injected air has straightness, the bag filter There is a problem that can not spray air to each portion of the inner peripheral surface of the.

Korean Patent Publication No. 2005-0062469 discloses a technical configuration for spraying the nozzle at 45 to 70 degrees and spraying air at a pressure of 2 to 6 kgf / cm 2 to effectively remove bag filter dust.

This configuration has a venturi that accelerates the cleaning air inside the bag filter, so that the nozzle effect is partially canceled to reduce the working effect. The angle of the nozzle is also machined at a wide angle of more than 45 degrees, so without venturi, jet air may not be evenly distributed on the inner surface of the bag filter.

The present invention is to solve the problems as described above, it is possible to improve the injection efficiency of the air or gas for dedusting to separate the foreign matter attached to the bag filter, and further improve the cleaning efficiency of the bag filter It is an object of the present invention to provide a dedusting device for a bag filter unit.

Another object of the present invention is to extend the life of the bag filter by improving the dust removal efficiency, improve the dust collection efficiency to increase the dust collection efficiency of the bag filter, and further reduce the air pollution of the bag filter unit In providing.

Bag filter dedusting apparatus of the present invention for achieving the above object is a plurality of housings provided with a dust room, the housing is provided in the housing, the bag cage, and a bag filter surrounding the outer periphery of the bag cage A bag filter unit, a venturi tube installed at an inlet side of each bag filter unit to exhaust the bag filter, and an air supply unit supplying air to the venturi tube for dedusting the bag filter,

The venturi tube is characterized by having a main body having a hollow portion and a plurality of guide vanes installed in the longitudinal direction on the inner circumferential surface of the main body.

In the present invention, the main body of the venturi tube includes a cylindrical portion, an upper extension portion extending gradually from the upper end portion of the cylindrical portion, and a lower extension portion extending radially from the lower portion of the cylindrical portion.

The guide vane installed in the longitudinal direction on the inner circumferential surface of the main body includes a base fixed to the inner circumferential surface, and a guide inclined portion extending from the base and inclined at a predetermined angle with respect to the radial direction.

The base and the guide inclined portion of each guide vane are formed to be inclined in a spiral direction from the upper side to the lower side.

And the outer circumferential surface of the upper expansion portion is provided with a plurality of support plates for supporting the body to the upper portion of the bag filter.

The dedusting apparatus of the bag filter unit according to the present invention may spray backwash air for dedusting the bag filter in various directions, thereby removing dust attached to each part of the bag filter.

In addition, the present invention can activate the high-pressure air flow flowing into the bag filter by compensating the pressure and speed of the cleaning air injected from the nozzle and passed through the venturi tube, the pressure of the air passing through the conventional venturi tube It is possible to improve the speed of 20 to 30% compared to the over speed.

1 is a cross-sectional view showing a dust collector equipped with a bag filter unit dust extraction apparatus according to the present invention,
2 is a partial ablation perspective view showing an extract of the bag filter unit according to the present invention,
3 is a partially cutaway perspective view of the venturi tube installed in the bag filter unit shown in FIG.
4 is a side view of the venturi tube according to the present invention;
5 is a plan view of the venturi tube according to the present invention,
6 is a plan view showing another embodiment of the venturi tube.

The dedusting apparatus of the bag filter of the present invention is for dedusting foreign matter collected (attached) to the bag filter, and an embodiment thereof is shown in FIGS. 1 to 3.

Referring to the drawings, the dust collecting device 10 is provided with the bag filter unit 20 according to the present invention is a housing 12, the dust room 11 is formed, and is installed below the housing 12 is the dust room ( 11) a hopper 13 for supplying air containing dust and storing dust collected by its own weight.

In addition, the upper side of the housing 12 has an inner space of the housing through the hopper 13, the lower room (11a) for the introduction of air or gas for removing dust, and for removing the air or gas from which dust is removed The diaphragm 15 which divides into the upper room 11b is provided. The diaphragm 15 is provided with the bag filter units 20 to be described later. The diaphragm 15 may be introduced into the upper room 11b after air or gas for removing dust is removed by the bag filter 22. It is installed through). And the upper end side of the bag filter unit 20 is provided with a dust removal unit 30 for removing the foreign matter attached to the bag filter 20.

As shown in FIG. 2, the bag filter unit 20 is provided with a bag cage 21 in the diaphragm 15, and air or gas introduced through the hopper 13 is provided on the outer circumferential surface of the bag cage 21. The filter bag 22 which removes a foreign material from the installation is provided. The back cage 21 includes a vertical support member 21a and horizontal support members 21b for supporting the vertical support members 21a in the circumferential direction. A fixing ring 21c for supporting the vertical support member 21a is installed on the vertical support members 21a. The bag cage 21 is not limited to the above-described embodiment, and may be any structure as long as the bag cage 21 can support the bag filter so that gas or air containing dust can pass therethrough.

The bag filter 22 is made of a porous mesh member, which may be made of metal or cloth. The size of the mesh member hole (eye) can be selected and used according to the size of the dust particles to be collected.

The dedusting unit 30 sprays air (airflow) for backwashing to the filter bag 22 at a high pressure to dedust it, and supports the upper part of the bag filter unit 20, that is, the upper end side of the bag cage 21. Venturi tube 40 is provided, and the cleaning air supply unit 50 for supplying air for cleaning through the venturi tube 40 from the upper side of the venturi tube 40.

The venturi tube 40 includes a main body 41 having a hollow portion 41a as shown in FIGS. 2 and 3, and the inner peripheral surface of the main body 41 has a plurality in the longitudinal direction of the main body 41. Guide vanes 45 are installed.

The main body 41 of the venturi tube 40 includes a cylindrical portion 42 having a hollow and an upper extension portion 43 gradually extending upward from an upper end portion of the cylindrical portion 42. A flange portion 44 is formed at the edge of the portion 43. And the lower expansion part 45 which is gradually extended from the lower end side of the cylindrical portion is formed. The lower deciding portion 45 may have a smaller extension length than the upper expansion portion 43. And the outer circumferential surface of the lower expansion portion 45 may be installed at equal intervals for fixing in the circumferential direction.

The guide vane 46 formed in the longitudinal direction of the main body 41 includes a base 47 fixed to the inner surface of the main body 41 at predetermined intervals, and an end of the base 47, that is, the base 47. A guide inclined portion 48 is provided at the free end of The guide inclined portion 48 of each guide vane 46 is formed to be inclined in the same direction with respect to the base 51 in the clockwise or counterclockwise direction. The base 47 and the guide inclined portion 48 form passages in the longitudinal direction of the hollow portion 41a of the main body 41. The vanes 46 are not in contact with each other so that the passages are not independent.

The guide inclined portion 48 may be twisted from the upper side to the lower side of the main body 41. That is, it may be bent in a spiral direction.

4 and 5, the base 47 and the guide inclined portion 48 of the vane 46 may be formed spirally from the upper side to the lower side of the main body 41. The guide vane 46 may have a streamlined cross section in order to reduce resistance. Two or six guide vanes may be installed at equal intervals on the inner circumferential surface of the main body 41, but is not limited thereto.

The cleaning air supply unit 50 is provided with a supply pipe 51 positioned in the upper room 11b of the housing, and a nozzle 52 installed in the supply pipe 51 and positioned at a vertical upper portion of the venturi tube 40. It is provided. And connected to the supply pipe 51 is provided with a blower (not shown) for blowing air. The apparatus for supplying air to the supply pipe 51 is not limited to the above-described embodiment, but may be made of a compressor for supplying high pressure air. In addition, the supply pipe may be connected to the main supply pipe for supplying a high pressure air is connected to the blower or compressor.

Referring to the action of the dust removal device of the bag filter unit according to the present invention configured as described above are as follows.

First, in order to remove dust from air or gas containing dust by using the dedusting apparatus of the bag filter unit, contaminated air is supplied through an inlet formed on the side of the hopper 13 through a blower. The contaminated air supplied in this way flows into the lower room 11a of the housing 12 and after the contaminants such as dust are removed by the bag filter 22 supported by the bag cage 21, the upper room 11b. Is discharged through).

In this process, fine dust is attached to the bag filter 22 so that the eyes (holes through which air passes) of the bag filter 22 made of a mesh member are blocked. When a predetermined time elapses in this state, the bag filter 22 accumulates contaminants such as dust, and the filtering effect is lowered.

When the bag filter 22 is contaminated by contaminants such as dust and the like and the filtering effect is reduced, the supply of gas or air to the hopper 13 is cut off and the blower is driven to the supply pipe 61. Supply high pressure air. As such, the air supplied to the supply pipe 61 is injected into the venturi tube 40 through the nozzle 62. Guided by the upper extension of the main body 41 injected into the venturi tube 40 is throttled to increase the flow rate. And the throttled air is guided by the vane 46 formed from the upper part to the lower part of the main body 41, and the injection-injection angle also becomes large by the lower expansion part 45 extended downward from the lower end part of the cylindrical part 42. And the injection speed of the washing air passing through the center on the lower extension 45 is relatively faster. Therefore, the cleaning air injected through the venturi tube 50 is irradiated to each part of the bag filter 22 to remove foreign matters such as dust deposited on the bag filter 22. Thus, since the angle and speed of the air injected by the venturi tube 50 can be diversified, the dust removal effect of the bag filter 22 can be maximized. In particular, since the vane 46 formed in the main body 41 is composed of a base 47 and a guide inclined portion 48, the hollow portion is divided in the longitudinal direction by these to form a substantial passage, and air (airflow) is formed by the passage. Turbulence is prevented and the speed and pressure are increased relatively. According to the inventor's experiments, it was found that the pressure and speed through the Bantury tube are increased by 20 to 30%.

In particular, as shown in FIG. 5, passing through the main body 40 in which the vanes 60 are spirally formed may generate vortices of the cleaning air. The generation of pre-currents can increase the diffusion angle at the outlet side of the venturi tube 50, and can increase the washing efficiency of the bag filter 22.

As described above, the dust extraction apparatus of the bag filter unit according to the present invention forms guide vanes on the inner circumferential surface of the venturi tube so that the air injected from the nozzle to the venturi tube can prevent an increase in the head loss due to turbulence. This reduces the loss of speed and pressure. This can prevent the deterioration of the dust removal efficiency of the bag filter.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention.

Therefore, the true scope of protection should be defined only by the appended claims.

Claims (4)

A plurality of bag filter units including a housing provided with a dust room, a housing inside the housing, a bag cage and a bag filter surrounding the outer circumference of the bag cage, and an inlet side of each bag filter unit And a venturi tube for dedusting the bag filter, and an air supply unit supplying air to the venturi tube for dedusting the bag filter.
The venturi tube has a main body having a hollow portion and a plurality of guide vanes installed in the longitudinal direction on the inner peripheral surface of the main body,
The body of the venturi tube has a cylindrical portion, an upper extension extending from the upper end of the cylindrical portion and gradually expanding, a lower extension extending from the lower portion of the cylindrical portion and extending radially,
The guide vane has a base installed in the longitudinal direction on the inner circumferential surface of the main body, and a guide inclined portion extending from the base and inclined at a predetermined angle with respect to the radial direction,
The base unit and the inclined portion of each guide vane is a dust removal apparatus of the bag filter unit, characterized in that formed inclined in a spiral direction from the upper side to the lower side.












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