JPS5843215A - Filter element of bag filter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to dust trapping devices, and more particularly to filter elements of bag filters.

The single filter element according to the invention can be used industrially for cleaning dust-containing gases in the nonferrous metallurgical industry for the production of lead and zinc, and in the production of cement and soot, etc.

Intensive research and development in dust capture device technology has resulted in a wide variety of gas purification devices.

The only technique found to be effective for separating fine dust, with an average particle size of less than 2 micrometers, from a gas stream is f That is, by removing trapped dust from the filter material, the service life of the filter is extended.

The use of renewable bag filters with cylindrical bags or hoses that are able to retain their shape during the passage due to the resulting overpressure of the gas stream to be filtered and that undergo a synchronous regeneration process by shaking and backflow is convenient. It is publicly known. However, the low 1 pass rate in round bags of 1 pass element, the short service life of the bag due to the high dynamic bend applied to the bag, and the large amount of metal consumed in its manufacture, the packing density of the filter media. As a result of the low
7 I got it. In the following, filter media is understood to mean the material from which filter hoses or filter bags are manufactured.

The need for increased filtration efficiency has resulted in the development of filters with endogenous systems. While gas is directed from the outside towards the interior of the cylindrical filter hose or filter nog, compression of the bag during filtration is prevented by introducing a rigid structure within it.

A pulse regeneration system type filter structure is known (1956
See West German Patent No. 1,228,130, published in 1999, C1,
(see Rot D 46102).

The filter regeneration step, i.e. the step of removing the trapped dust from the filter, is carried out by supplying compressed air pulses into each bag without inactivating the filter during regeneration. .

However, in this Nogu structure, since the rigid element is conveniently used, the structure of the %f' over-element becomes complicated. .

A disadvantage is that replacing the used filter element 1 requires labor-intensive work.

Another direction of improvement in bag filter construction lies in packing the filter material more closely, thereby reducing the amount of metal consumed in the manufacture of the filter and reducing its overall size.

Two-lug filters are known which have a close-packed filter structure in which the nog is divided into two, three or four sections by a single longitudinal seam, thereby achieving a close packing degree (UK). Patent No. 891.806).

With this bag division method, the filter material was packed 1.5 times more densely than in a cylindrical/seg filter. As a result of such filling, less metal is consumed in its manufacture and the overall size of the filter is reduced.

However, said filter has a high wear rate due to the friction between the parts of the filter element due to the instability of the parts sliding in the longitudinal seams connecting the parts, and also requires a large amount of U overfill for its manufacture. There are drawbacks that require it. To prevent friction between the parts of the bag, an internal framework is used, but this increases the amount of metal consumed and complicates the installation of the filtration elements in the bag filter.

Also known is a bag filter element with a dust arrester comprising inner and outer hoses or lugs arranged concentrically (U.S. Pat. No. 2,014,298).
No. Specification). This can be considered as the master disc of the present invention described below.

The inner bag of this known filter element is closed in the paper part and the dust content is fixed on the snout. Compression of the inner bag during filtration is prevented by arranging a plurality of spacer rings at predetermined intervals from each other inside the inner nog of the filter.

The working principle of the filtration element includes supplying dust-containing gas into the intermediate space between the inner bag and the outer bag;
The method includes the steps of depositing dust on the upper surface of each bag and then allowing the gas thus collected to escape from both sides of the filter element.

One of the disadvantages of the above structure is that the manufacturing and assembly processes are complicated, and that the filling ZA of 5 degrees is insufficient.Also, since the tapered shape of the inner bag is preferred, its manufacturing process is complicated. As a result, a larger amount of excess material must be used.

Common features of the known constructions of bag filters are therefore a complicated manufacturing and fixing of the filter element, an insufficient packing density of the filter element, and a short service life. As a result, the overall size of the filter increases and the metal stool volume increases.

The present invention achieves dense packing of the filtration material by changing the shape of the filtration element, and improves the shape retention properties of the filtration material due to the overpressure generated by the gas flow during the filtration process.
The purpose is to provide a filtration element for Mazda filters.

This concentrically arranges the inner bag and the outer bag
In one filter element of the Nomag filter, the bags are interconnected along longitudinal seams along the generatrix to form compartments for the passage of dust-containing gas between the bags, each compartment having an outer Nomag 0181"IJA') f
L)) Part 1□% (,,l:Q1mK8B7) achieved by. □ Because of this structural layout, and because of the filtration pressure generated by the gas flow between each layer of the filtration material, the filtration elements tend to expand and form a closed system of cylindrical compartments of small diameter, making them more compact. A more efficient overfilling is achieved, and the compartments and the entire filter structure formed in this way exhibit better shape retention without the use of frames or spacer rings.

The outer bag portion of at least one compartment is made of a filtration material that is 1.5 to 2 times more durable than the filtration material of the inner bag portion of that compartment.

Such a structure of the filter element ensures uniform wear of the inner filter of the compartment and the filter material of the outer bag, thereby extending the service life of the filter element and lowering its manufacturing cost.

Manufacturing the outer bag portion of a compartment from a fugitive material that has an abrasion resistance less than 1.2 times that of the inner bag portion of the compartment, because the abrasion resistance of mass-produced filter materials varies by ±10%. undesirable. On the other hand, manufacturing the outside of the compartment/mag part with a filter material that has a wear resistance more than 5 times that of the inner part of the compartment/mag will reduce the service life of the filter with such filtering elements. So it's also undesirable.

Preferably, at least one of the longitudinal seams connecting the inner mug and the outer bag is provided with a through slit between adjacent sections. This construction simplifies the manufacture, installation and use of the filter element.

It is also desirable that the inner parts of all compartments be sealed at least at one end by clamping means.

This will increase the f4 fraction of the dust-laden gas due to the unidirectionality of the gas flow and dust deposition on the interior surfaces of the compartment.

Still further, it is desirable that at least one section of the inner bag is partially made of gauze. This simplifies the manufacture and installation of bag-type filters.

Hereinafter, embodiments of the present invention shown in the drawings will be described in detail.

In the accompanying figures, one filter element of the bag filter includes a concentrically arranged outer bag 1 and an inner bag (FIG. 3), which bags have a longitudinal seam or seam 3 along the generatrix.
are interconnected to form a plurality of compartments 4 and
), and each section is the outer part 5 of mag 1 and the inner piece ζ
It consists of part 6 of part 2.

As a temporary material for Nomag 1 and 2, filter cloth <
For example, Z-Kron), felt (eg, Nomex Fino), nonwoven fabric (eg, Terylene fiber), etc. can be used.

The outer bag 10 section 5 of at least one compartment 4 is made of a filtration material that is 1.2 to 5 times more durable than the filtration material of the section 6 of the inner bag 2.

At least one of the longitudinal seams 3 connecting the bags 1 and 2 is
Through slits or cuts 7 made between adjacent sections 40
(Figure 3).

The inner parts 6 of all compartments 4 are interconnected in a gas-tight manner or are closed together by means of clamping elements 8 (FIGS. 3, 4, 5 and 8).

6, 7 and 8, the inner bag 20 portion 6 of at least one compartment 4 consists of gauze.

This first filter element is installed in the bag filter like manure. At least one end of the outer bag 1 is connected to the pipe 9 of the Nomag filter (FIGS. 1, 3, 4 and 6), and the clamp 1 is connected to this nozzle.
Fixed by 0.

One end of the outer 79 tsugu (Figures 1, 5 and 8)
The vibration mechanism or stirring mechanism (
It is fixed to a movable lid 11 with a hole 12 and a connecting rod 13 (not shown).

The one pass element according to the invention operates as follows.

A dust-containing gas is passed through the tube 9 into the compartment 4 of the filter element defined by the section 5 of the outer bag 1 and the section 6 of the inner bag 20.

Due to the resulting overpressure of the passed gas, parts 5 and 6 tend to expand or bulge, and compartment 4 assumes a nearly cylindrical shape. By passing the dust-containing gas through the filter material, the dust is collected on the inner surfaces of parts 5 and 6, and the gas purified in this way is transferred to the outer part of the outer nomag 1.
．． Escape to the inside, and then the eyes.

Escape through the inside of bag 2. After that, the gas
It is discharged through the slit 7 and the removable 7-hole 110 hole 12. The overpressure created by the dust in parts 5 and 6 becomes significant and reaches a predetermined value at which it begins to clean or regenerate the F"rm '* element. When regenerating the element by shaking and backflowing, the accumulated The dust is discharged from the filter element through the compartment 4 and the nosoip 9.

When contaminated gas is fed into the compartment 4 from above through the pipe 9 (FIG. 4), the resulting overpressure of the gas flow causes the bag 1 to
Parts 5 and 6 of 2 swell and take on a nearly cylindrical shape. The dust-laden gas passing through the filter medium tends to deposit dust on the inner surfaces of sections 5 and 6, while the purified gas exits through the outer bag 1 and through the interior of the inner bag 2. The purified gas is discharged from the interior of the filter element through the slit 7.

The discharge of accumulated dust during regeneration of the filter element takes place via the lower pipe 9 (FIG. 3). When the dust-containing gas is fed upwardly, the gas and dust move in the same direction along section 4, which reduces the secondary deposition of deposited dust upon regeneration of the filter element and increases the filtration rate. raise.

If the inner lug 20 portion 6 of at least one compartment 4 consists of gauze (FIGS. 6, 7, 8), the dust-containing gas passes through the lower pipe 9 and the interior of the inner bag 2. 1
Enter the over-element. When the dust-containing gas passes through the inside of the inner lug 2, some of the dust is transferred to the inner lug 20.
Although trapped on the surface, a complete pass is carried out by passing the gas through part 5 of the outer nomag 1.

Upon regeneration of the filter element by shaking and backflow, the deposited dust is discharged through the compartment 4 and the interior of the inner nomag 2. This increases the K filtration rate due to the low velocity of the gas flow inside the filter element when restarting the f-filtration process following regeneration of the filter element.

In order to improve the gas filtering performance and in particular to reduce the manufacturing costs of the filtration elements, the inner part 6 of the compartment 4 can be manufactured from relatively cheap and less durable materials, but the compartment 4
The outer part 5 of is preferably made of a highly wear-resistant material, since considerable dynamic loads are applied to it. - As an example, glass fiber can be used for the inner lug and Norm fiber for the outer bag.

[Brief explanation of drawings]

FIG. 1 is a side view of one filter element of the Nomag filter according to the invention, FIG. 2 is a cross-sectional view taken along the line n-1r of FIG. 1, and FIG. 3 is a section A of FIG. 1. FIG. 4 is an enlarged sectional view of the case where dust-containing gas is supplied and dust is discharged through the lower sleeve; FIG.
FIG. 5 is an enlarged view showing the case where gas containing gas is supplied into the filtration element through the upper gib; FIG.
Fig. 6 is an enlarged sectional view of part B in Fig. 1 when the gas containing gas is fed into the filtration element through the e-iso, and Fig. 6 is part A in Fig. 1 when gauze is used as part of the inner bag. FIG. 7 is a cross-sectional view taken along the line ■--■ in FIG. 6, and FIG. 8 is a cross-sectional view of part B in FIG. 1 when gauze is used for the inner bag. 1...Outer bag, 2...Inner Nomag, 3...
Vertical seam, 4... Division, 5... Outer Nomag 1 part, 6... Inner ζ lug 2 part, 7... Through slit, 8... Clamp element. Applicant's agent Kiyoshi Inomata:; :・：・. (15) fE2' 67-

Claims (1)

[Claims] 1. Consisting of an inner bag (2) and an outer bag (1) arranged concentrically/? In the bag filter filtration element, the nogs (1 and 2) are interconnected along the generatrix by a longitudinal seam (3) to form a gas passage compartment (4) between these nogs. and each section (4) is outside Nogu (1)
One pass element of a filter, characterized in that it consists of a part (5) of the inner bag (2) and a part (6) of the inner bag (2). 2. The outer bag + 11 section (5) of at least one section (4) is 1.2 to 5 times more durable than the filter material of the inner bag (2) section (6) of that section (4). A filtration element according to claim 1, characterized in that it is made of a filtration material of. 3. Vertical seam (3) interconnecting bags (1 and 2)
Filter element according to claim 1 or 2, characterized in that at least one of the filter elements is provided with a through slit (forced) made between adjacent compartments (4). 4. A one-piece element according to any one of claims 1 to 3, characterized in that the inner part of the compartment (4) is sealed at least at one end thereof by flange means (8).5. Filtration element according to claim 1 or 2 or 4, characterized in that a part of the inner bag (2) of at least one compartment (4) is made of gauze.