KR200167875Y1 - Frame resistant fabric filter bag - Google Patents

Abstract

The present invention relates to a flame retardant filter bag for a dust collector bag filter for purifying the air containing a large amount of dust contaminants in various industrial sites to discharge only the purified air to the atmosphere, the purpose of which has excellent filtration performance and It is to develop flame retardant filter cloth for dust collector bag filter with excellent flame resistance and excellent flame retardant effect when flame contact with filter bag.

The filter bag 5 of the present invention is sprayed or impregnated and heat-treated by flame retardant resin, silicon, teflon, phenol, etc., in which the base nonwoven fabric 32 including the woven fabric layer 33 and the upper layer 31 are bound by needle punching. Bonding and focusing between the fibers is achieved to improve the shape stability of the fabric (laminate).

Description

Flame Retardant Filter Bags {Frame resistant fabric Filter Bag}

The present invention relates to a flame retardant filter bag used in a filter bag dust collector for removing dust generated in the industry, and more specifically, to clean the exhaust air containing dust-type contaminants in the steel or cement industry, etc. It relates to a flame retardant filter bag that allows only purified air to be released into the atmosphere and can delay combustion in the event of a fire in the bag filter.

Generally, in the steel industry, cement industry, or industrial sites that use powder or produce powder-like products, many processes produce polluted air containing a large amount of dust, and when such polluted air is released into the atmosphere as it is, All companies are required to purify the polluted air and release it into the atmosphere because it can cause serious air pollution.

However, the waste incinerator for the above purpose is caused by the fire of the filter bag due to the flame introduced into the dust collector from the filter bag, the production process is interrupted or the life of the device decreases, operation maintenance costs increase, fire of peripheral equipment There are problems such as frequent occurrence of threats to the entire process, such as exposure risks.

In addition, there is a problem in the domestic industry that the generation of dust increases due to the increase in the use of heavy oil combustion boiler, and the particles of dust generated in the heavy oil boiler contains a large amount of heavy oil components.

For this reason, when the polluted air is discharged to the atmosphere as it is, it can cause serious air pollution. Therefore, a waste incinerator having a bag filter has been constructed to purify the polluted air.

At this time, one of the air purifying means is a bag filter for the dust collector, and inside the bag filter, a filter bag having a long circular or non-circular bag shape for filtering air is mounted at the center thereof. It is.

As a performance of the filter bag of the bag filter for dust collector used as described above;

First, there is a need for a filter bag having high filtration performance, which is good in breathability but has fine air gaps and uniform air, and does not allow dust to pass through.

It is said that the most non-woven fabric meets this demand, and thus, non-woven fabric is widely used as a material for filter bags.

Secondly, since most industrial processes employing dust collectors are carried out at high temperatures and are often accompanied by flames by incineration or melting of resins or metals, high heat resistance and flame resistance are required.

Other, breathable or waterproof in special cases. Water repellency may be required.

As described above, a nonwoven fabric is widely used as a filter bag for satisfying requirements. Such a nonwoven fabric for filter bags has a multi-layer superposition including a woven fabric, rather than a single nonwoven fabric in cross-sectional structure.

Referring to FIG. 2, which is an example of a cross-sectional structure of a conventional filter bag, a layer structure of a filter bag is described. A second layer made of a fabric for strong reinforcement between the first layer 21 and the third layer 23 made of nonwoven fabric ( 22) is intervened.

However, such a conventional bag filter has a problem that it cannot be used for applications requiring high flame retardancy because it is much less flame retardant and often causes a fire.

In order to solve such a problem, a mixture of a resin and a member carbon having excellent heat resistance was coated on the first layer 21, but there was a problem that the breathability was remarkably inferior even though the flame retardancy was solved to some extent. It was.

In addition, polyphenylene isophthalamide in which a thin nonwoven fabric of polyphenylene relephthalamide fibers is needled on the outer surface of the filter bag which is in primary contact with the impregnated air to increase the flame resistance, in particular, the fire resistance by the high temperature spark, The addition of a felt laminate of polyester or polyphenylene sulfide fibers is disclosed in Korean Patent Application Publication No. 94-703223, but the use of a special fiber material was not economical and the form stability of the fabric was not improved. .

An object of the present invention for solving the conventional problems as described above has excellent filtration performance, excellent flame retardancy effect when the flame contact with the filter bag (filter bag) excellent flame retardant for dust collector bag filter with good stability of the fabric To develop filter cloth.

An object of the present invention as described above is a filter bag consisting of a superposition of a non-woven fabric for dust filtering and a woven fabric for reinforcing strength, needle punching the carbon fiber or graphite fibers on one surface of the filter bag and the surface thereof It is achieved by spraying or impregnating and drying a heat resistant resin, such as teflon, silicone, and phenol resin, to provide a flame retardant filter bag.

The carbon fiber nonwoven fabric and the base nonwoven fabric are preferably treated with heat resistant resins (teflon, silicone, phenol).

In addition, it is preferable that each of the nonwoven fabric layers is additionally focused by needle punching.

1 schematically shows a general use example of a bag filter in a dust collector.

Cross-section

2 is a diagram schematically showing a cross section of a conventional filter bag.

3 is a view schematically showing the cutting edge of the filter bag of the present invention

<Description of the symbols for the main parts of the drawings>

(1): housing (2): impregnated air inlet

(3): frame (4): retainer

(5): filter bag (6): back cage

(7): clean air outlet (8): separator

(9): clean air chamber (10): impregnated air chamber

(11): dust outlet 21: first layer

22: second layer 23: third layer

(31): upper layer (32): base nonwoven fabric

33: woven fabric layer

Referring to the present invention in detail according to the accompanying drawings as follows.

1 shows a cross-sectional view schematically showing a general use of the bag filter in the dust collector, wherein the dust collector is provided with a dust-containing air inlet 2 in the lower part of the housing 1, the vertical and A filter bag 5 enclosing a bag cage shaped back cage 6, which is composed of a retainer 4 supported by a frame 3 constituted in a horizontal grid, is located. (1) The upper part is provided with the clean air discharge port 7 through which the purified clean air is discharged.

In addition, the back cage 6 is fixedly supported by the separating plate 8 to the housing 1, and the interior space of the housing is separated into the clean air chamber 9 and the vacuum chamber 10, and accumulated on the bottom of the housing. A dust outlet 11 for discharging dust is provided.

Although FIG. 1 shows a dust collector having four bag filters for the convenience of naming each part, it is obvious that the bag filters may be provided in plural numbers according to the use and capacity.

3 is a schematic view of the cut surface of the filter bag according to an embodiment of the present invention, the upper layer 31, that is, the layer in contact with the air containing the oxyphen fiber nonwoven fabric or mixed nonwoven fabric of oxyphen fiber and low melting point fiber It is made, coupled to the base nonwoven fabric 32 and interposed between the base nonwoven fabric 32 is a woven fabric layer 33 for strong reinforcement.

In the above embodiment, the upper layer 31 and the base nonwoven fabric 32 contain low-melting fibers and are thermally fused. As the low-melting fibers, low-melting polyester fibers are employed.

In the present invention, the carbon fiber is employed for imparting flame retardancy, and the carbon fiber has been mainly used for applications such as industrial friction materials or heat insulating materials.

The strength of the carbon fiber as described above has a high strength of 10g / d or more and very good heat resistance at 1000 ℃ or more.

The filter bag 5 of the present invention binds the base nonwoven fabric 32 including the woven fabric layer 33 and the upper layer 31 by needle punching, and then sprays or impregnates heat resistant resins such as Teflon, silicone, and phenol resin. Drying results in bonding and connection between fibers.

Hereinafter will be described the operation of the dust collector using the filter bag of the present invention.

The dust collector configured as described above introduces dust and contaminants into the outer surface of the back cage 6 while flowing the in-process dust discharged into or out of the back cage 6 to the center from the outside of the back cage 6. Filtered by a filter bag of adherent nonwoven fabric and then discharged to the clean air outlet 7 in the upper part of the housing, dust and contaminants are accumulated in the lower part of the housing 1 and then discharged to the dust outlet 11 for disposal. .

As described above, the dust collector filter bag of the present invention has excellent flame retardancy and good form stability of the fabric.

The present invention has been described in detail only with respect to the described embodiments, it will be apparent to those of ordinary skill in the art that various modifications and changes may be made within the technical spirit of the present invention and such modifications and modifications are attached thereto. Naturally, it belongs to the claims.

Claims (4)

In the filter bag for dust collector bag filter composed of a superposition of nonwoven fabric and woven fabric for dust filtering, Flame retardant filter bag characterized in that the carbon fiber, graphite (graphite) fibers and heat-resistant resin (phenol silicone, Teflon) is added to the cross section of the filter bag. The heat-resistant filter bag of claim 1, wherein the carbon fiber nonwoven fabric and the base nonwoven fabric are surface treated (sprayed or impregnated) with a heat resistant resin. The flame retardant filter bag of claim 1, wherein each of the nonwoven fabric layers is focused and bonded by needle punching and heat fusion by a high temperature roller. In the filter bag for the dust collector bag filter composed of a nonwoven fabric for dust filtering and a woven fabric for reinforcing the strength, The filter bag 5 is formed by binding the base nonwoven fabric 32 including the woven fabric layer 33 and the upper layer 31 by needle punching, and drying after spraying or impregnating a heat resistant resin, such as Teflon, silicone, or phenolic resin. Flame retardant filter bag, characterized in that the fabric stability of the fabric (laminate) is made by making the coupling and connection between the.