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WO1991006360A1 - Filtre a sac pour la separation des particules de poussieres contenues dans un gaz - Google Patents

Filtre a sac pour la separation des particules de poussieres contenues dans un gaz Download PDF

Info

Publication number
WO1991006360A1
WO1991006360A1 PCT/SE1990/000680 SE9000680W WO9106360A1 WO 1991006360 A1 WO1991006360 A1 WO 1991006360A1 SE 9000680 W SE9000680 W SE 9000680W WO 9106360 A1 WO9106360 A1 WO 9106360A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter bag
bag
rods
gas
filter
Prior art date
Application number
PCT/SE1990/000680
Other languages
English (en)
Inventor
Odd Edgar BJARNØ
Original Assignee
ABB Fläkt AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Fläkt AB filed Critical ABB Fläkt AB
Publication of WO1991006360A1 publication Critical patent/WO1991006360A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material

Definitions

  • the present invention relates to a filter bag for separating particles from a gas by screening.
  • the filter bag is adapted to cooperate with an arrangement for expanding and supporting the filter bag.
  • a common method of separating particles from a gas is to let the gas pass through a bag filter.
  • a bag filter usually contains a plurality of filter bags which are made of PTFE (poly- tetrafluoroethylene), fibre-glass or some other suitable filtering material.
  • PTFE poly- tetrafluoroethylene
  • fibre-glass or some other suitable filtering material.
  • the gas pressure keeps the fil- ter bag expanded, but in the second case, it compresses the filter bag so as to collapse.
  • FIG. 1 illustrates an example of a conventional fil ⁇ ter cage 1 for supporting a filter bag 2.
  • This cage com ⁇ prises nine rods 3 which are held together by holding means 4 and form, together with these, a rigid construc ⁇ tion.
  • the bag is kept expanded adjacent the rods 3, whereas between the rods it forms concave folds. The folds are extended during cleaning, when the direction of gas flow is reversed, and this motion of the folds breaks up and throws off the formed dust cake from the bag. 2
  • a cage the position of which is not fixed, for supporting a filter bag can also result in the filtering material being unevenly distributed between the rods, i.e. in some places there will be big folds and, consequently, the filtering material will perform great motions and thus be subjected to considerable strain, whereas in other places there will be small folds and small motions and, thus, poor cleaning of the filtering material during the cleaning operation.
  • the cage can of course be pro ⁇ vided with further rods, which means however that the cage will be heavier and more expensive in manufacture. This especially applies to long filter bags.
  • the object of the present invention therefore is to provide a filter bag for separating particles from a gas by screening, which filter bag can cooperate in such manner with an arrangement for expanding and supporting the filter bag that the filtering material is not sub ⁇ jected to high mechanical loads during cleaning.
  • the above-men ⁇ tioned problems are solved by means of a filter bag which is of the type mentioned by way of introduction and which is " characterised by means arranged on the surface of the filter bag, for fixingly receiving said arrangement.
  • the position of the arrangement will be fixed relative to the filtering material. This means that there will be no sliding motion between the arrangement and the filtering material and no irregular formation of folds in the filtering material.
  • at least three means are arranged on the surface of the filter bag.
  • 3 - 12, particularly 4 - 8, especially 4 means are arranged on the surface of the filter bag.
  • the means are preferably shaped as channels, grooves or rails extending along the inner surface of the filter bag in the longitudinal direction thereof, preferably in substantially the entire longitudinal direction thereof.
  • the channels are preferably made of the same material as the filter bag, whereas the grooves or rails are made of plastic, e.g. PTFE, or metal, e.g. aluminium. Description of a proposed embodiment
  • Fig. 1 illustrates a conventional cage for supporting a filter bag.
  • Fig. 2 is a schematic view of an embodiment of the filter bag according to the present invention.
  • Fig. 3 is a top plan view of the filter bag in Fig. 2.
  • Fig. 4 is a schematic view of a further embodiment of the filter bag according to the present invention.
  • the filter bag 5 shown in Fig. 2 is in the form of a conventional, closed-end cylindrical hose having a length of 3-10 m, usually about 10 m, and a diameter of 100-300 mm, usually about 145 mm.
  • the bag is provided with four parallel channels 6 which extend along the inner sur ⁇ face of the bag in the entire longitudinal direction thereof and have an inner diameter of 10-40 mm, usually about 20 mm.
  • the channels are sewn on to the bag inner surface during manufacture thereof and are preferably made of the same material as the bag which is made of, for example, fibre-glass that withstands high operating tempe ⁇ ratures and has high chemical resistance to noxious sub ⁇ stances, such as sulphur, but has low mechanical strength.
  • transverse stiffening means 7 are inserted in a given spaced-apart relationship, 0.5-2 m, usually about 1 m, into the channels 6 over the entire length thereof.
  • the stiffening means are designed as a quadrangle in each corner of which an eye 8 is posi- tioned.
  • One eye is inserted into each channel 6 via an opening 9 formed in the wall of the channel.
  • the outer diameter of the eye is 10-40 mm, usually about 20 mm, whereas its inner diameter is 7-37 mm, usually about 17 mm.
  • a rod 10 is inserted in each channel 6 and the eyes 8 thereof, and as appears from Fig. 3, the outer diameter of the rods, which is 5-35 mm, usually about 15 mm, is smaller than the inner diameter of the eyes 8.
  • the rods 10 are preferably of the same length as the channels 6 and thus extend along the bag 5 in the entire longitudinal direction thereof.
  • the eyes 8 of the stiffening means 7 fix, in coopera- tion with the channels 6, the position of the rods rela ⁇ tive to the filtering material of the bag, at the same time as they prevent, by their stiffening effect on the rods, excessive inward bending of the rods during opera ⁇ tion, as the dust-laden gas which is to be cleaned flows from the bag outside and inwards and exerts a considerable gas pressure upon the filtering material.
  • the channels are positioned symmetrically at the same distance from each other along the bag inner surface, which means that the folds of the filtering material that are formed between the rods 10 during operation are of the same size along the entire circumference of the bag.
  • the appearance of the bag during operation is indicated by dashed lines in Fig. 3.
  • the bag instead assumes the shape indicated by full lines in Fig. 3.
  • Fig. 4 illustrates a filter bag 11 provided with four parallel longitudinal rails 12 which are positioned symme ⁇ trically at the same distance from each other along the bag inner surface.
  • Each rail is formed with a longitudinal groove 13 facing the centre of the bag.
  • the rails are made of PTFE or aluminium and are glued to the inner surface of the bag in the entire longitudinal direction thereof.
  • the rods 14 are fixedly interconnected by stiffening means 15 which are arranged along the rods in a given spaced-apart relationship, 0.5 - 2 m, usually about 1 m, over the entire length thereof.
  • the stiffening means are shaped as a star with four points which are each welded to a rod 14.
  • the rods 14 and the stiffening means 15 are consequently inserted into the bag 11 as an inte ⁇ gral unit, the rods 14 being inserted in the rails 12, whereas the stiffening means 15 are inserted in the grooves 13 of the rails.
  • the rods 14 are preferably of the same length as the rails 12 and accordingly extend along the bag 11 in the entire longitudinal direction thereof.
  • the position of the rods relative to the filtering mate ⁇ rial of the bag is in this case fixed by the rails only. They provide, however, sufficient fixing of the rods also during the cleaning operation.
  • the filter bag 11 is, during operation and cleaning, of the same appearance as the filter bag 5.
  • the channels 6 can, for example, be glued or welded instead of sewn on to the bag inner surface.
  • the channels can also be integrated with the filter bag and then, con ⁇ sequently, need not be attached to the surface of the filter bag.
  • the rails 12 can, for example, be welded or sewn instead of glued to the bag inner surface.
  • the stiffening means 7 can, for example, be designed as the stiffening means 15, and vice versa, the eyes 8 being in the first case attached to the points of the star.
  • the channels 6 or the rails 12 can, for example, be attached to the bag outer surface, instead of the inner surface thereof.
  • the stiffening means 7 can, for example, be provided with hooks instead of eyes, and of course the eyes need not be of circular shape.
  • the rods 10 and 14 can, for example, be composed of a plurality of short members, e.g. 3 members, instead of being made in one piece.
  • the stiffening means 15 can, for example, be inte- grated with the rods 14, instead of being welded thereto.
  • the shape of the stiffening means and the number of rods and channels or rails of course vary with the appear ⁇ ance of the filter bag which is to be expanded and sup ⁇ ported.
  • the term "transverse stiffening means” means that the stiffening means extend in the transverse direction of the filter bag, the angle between the stiffening means 7 and 15 and the channels 6 or the rails 12 of the filter bag not necessarily being 90°.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filtering Materials (AREA)

Abstract

Le filtre à sac décrit, qui sert à séparer les particules de poussières contenues dans un gaz par criblage, est destiné à coopérer avec un agencement (7, 10) d'expansion et de support du filtre à sac (5) et comporte sur sa surface un organe longitudinal (6) servant à recevoir l'agencement (7, 10) et à le maintenir en position fixe.
PCT/SE1990/000680 1989-10-25 1990-10-19 Filtre a sac pour la separation des particules de poussieres contenues dans un gaz WO1991006360A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8903534-9 1989-10-25
SE8903534A SE466942B (sv) 1989-10-25 1989-10-25 Filterslang med medel foer fixerande upptagning av utspaennings- och uppstagningsanordning

Publications (1)

Publication Number Publication Date
WO1991006360A1 true WO1991006360A1 (fr) 1991-05-16

Family

ID=20377266

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000680 WO1991006360A1 (fr) 1989-10-25 1990-10-19 Filtre a sac pour la separation des particules de poussieres contenues dans un gaz

Country Status (3)

Country Link
AU (1) AU6634890A (fr)
SE (1) SE466942B (fr)
WO (1) WO1991006360A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE401103B (sv) * 1976-08-31 1978-04-24 Svenska Flaektfabriken Ab Anordning for infestning av ett kompaktfilter i en kassettram
US4202677A (en) * 1977-06-22 1980-05-13 Clarke's Sheet Metal, Inc. Filter bag with removable shaping members
SE454751B (sv) * 1984-05-29 1988-05-30 Safematic Ltd Oy Filterkassett for rening av gaser med veckad filterduk, berstenger och spennkorgar

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE401103B (sv) * 1976-08-31 1978-04-24 Svenska Flaektfabriken Ab Anordning for infestning av ett kompaktfilter i en kassettram
US4202677A (en) * 1977-06-22 1980-05-13 Clarke's Sheet Metal, Inc. Filter bag with removable shaping members
SE454751B (sv) * 1984-05-29 1988-05-30 Safematic Ltd Oy Filterkassett for rening av gaser med veckad filterduk, berstenger och spennkorgar

Also Published As

Publication number Publication date
SE466942B (sv) 1992-05-04
SE8903534D0 (sv) 1989-10-25
SE8903534L (sv) 1991-04-26
AU6634890A (en) 1991-05-31

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