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WO1996036418A1 - Filtre a sacs et production de ce type de filtre - Google Patents

Filtre a sacs et production de ce type de filtre Download PDF

Info

Publication number
WO1996036418A1
WO1996036418A1 PCT/SE1996/000637 SE9600637W WO9636418A1 WO 1996036418 A1 WO1996036418 A1 WO 1996036418A1 SE 9600637 W SE9600637 W SE 9600637W WO 9636418 A1 WO9636418 A1 WO 9636418A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
rods
combustion chamber
burning
combustion
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/SE1996/000637
Other languages
English (en)
Inventor
Evald Johansson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Technology FLB AB
Original Assignee
ABB Flaekt AB
Flaekt 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 Flaekt AB, Flaekt AB filed Critical ABB Flaekt AB
Priority to AU57858/96A priority Critical patent/AU5785896A/en
Publication of WO1996036418A1 publication Critical patent/WO1996036418A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • 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
    • B01D46/06—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material with means keeping the working surfaces flat

Definitions

  • the present invention relates to combustion and explosion processes in general, more particularly, to the use of combustion or explosion processes for industrial application, such as cleaning of industrial equipment and machinery by devices employing these processes.
  • Proper maintenance of industrial machinery generally includes frequent removal of undesired accumulations of particles on different elements of the machinery. Parti ⁇ cles accumulation on the machinery parts can be minimized by cleaning the environment surrounding the machinery. Various air cleaning devices have been used for that purpose.
  • shock wave cleaning is particularly useful for elements which are not readily removed for cleaning and/or elements which are particularly susceptible to the use of other cleaning methods and/or cleaning materials.
  • Gas dynamic generators which induce shock wave vibrations in their vicinity are known in the art. When a gas dynamic generator is placed near a machinery element to be cleaned, the shock waves induced in the vicinity of the element can be utilized to clean the element, as described above. Gas dynamic generators are useful aids in the production of construction materials and appara ⁇ tus, metallurgy, mining, the chemical industry, oil processing and the food industry.
  • Gas dynamic generators have been used in the past, for example, for cleaning dust accumulation and other deposits in a centrifugal compressor.
  • the centrifugal compressor includes a pumping wheel with pumping blades mounted in a pumping chamber.
  • Nozzles which are connect ⁇ ed to a source of pressured gas via a gas channel, are mounted in the pumping chamber at a preselected distance from the pumping blades.
  • the source generates high pres ⁇ sure gas pulses which impinge on the pumping blades thereby removing undesired accumulations from the blades.
  • the distance between the nozzles and the pumping blades is selected to be between 1 and 1.5 times the diameter of the gas channel.
  • Gas dynamic generators have also been used for cleaning contaminated electrodes, particularly for puri ⁇ fying electrodes of electrofilters.
  • An ignited air-fuel mixture is transported through an elongated detonation chamber, in which the burning mixture develops a high velocity, and is released onto a shock receiving plate which is associated with a shock transporting block.
  • the block carries shock waves produced in the plate to the electrodes, thereby causing high acceleration vibrations in the electrodes to "shake off" the deposits.
  • shock-wave generators To produce sufficiently powerful shock waves, existing shock-wave generators often employ straight, elongated, combustion chambers, typically having a length of 4 meters or longer. This results in systems which are highly space-consuming and, therefore, imprac ⁇ tical for various application.
  • a shock wave generator constructed and operative in accord ⁇ ance with the present invention may be utilized to remove various deposits from industrial machinery parts, for example to clear clogged pipes or to ensure free flow of dry materials.
  • a two-phase shock wave generator including a combustion chamber including a first, combustion, portion having an input port and a second, detonation, portion downstream of the first portion and having an output aperture, an air-fuel supply line, operative to feed the input port with an air-fuel mixture, an igniter, associated with the air- fuel supply line, which ignites the air-fuel mixture in the supply line and initiates a burning front which propagates towards the input port and a turbulence stimu ⁇ lator, fixedly mounted in the combustion chamber, which enhances and controls burning of the air-fuel mixture and includes a first section, situated within the combustion portion of the combustion chamber and having a predeter ⁇ mined first gas dynamic resistance and a second section, situated within the detonation portion of the combustion chamber and having a predetermined second gas dynamic resistance, wherein the first resistance is such that burning of the air-fuel mixture in the combustion portion yields a predetermined pressure level suitable for initi ⁇ ating detonation
  • the second gas dynamic resistance is lower than the first gas dynamic resistance.
  • the air-fuel supply line is associated with the input port via a perforated nozzle which scatters the burning front substantially upon entry of the burning front into the combustion chamber.
  • the turbulence generator includes a plurality of gas dynamic obstructers positioned at fixed locations along the combustion chamber to yield the preselected first and second gas dynamic resistances along the com ⁇ bustion and detonation portions, respectively.
  • each obstructer includes a plurality of rods, generally perpendicular to the direction of propa ⁇ gation of the burning front in the combustion chamber.
  • the plurality of rods are arranged along a generally helical path, having a predetermined pitch.
  • the combustion chamber of the shock wave generator includes at least one bent portion.
  • the at least one bent portion may be include at least one bend in the combus ⁇ tion portion of the combustion chamber and/or at least one bend in the detonation portion of the combustion chamber.
  • the locations of the bent portions are prefera ⁇ bly selected in accordance with a predetermined folding scheme.
  • a shock wave generator including a combustion chamber having an input port and an output aperture, an air-fuel supply line operative to feed the input port with an air-fuel mix ⁇ ture, an igniter, associated with the air-fuel supply line, which ignites the air-fuel mixture in the supply line and initiates a burning front which propagates towards the input port, a turbulence stimulator, fixedly mounted in the combustion chamber, which enhances and controls burning of the air-fuel mixture and a perforated nozzle, associated with the input port, which scatters the burning front substantially upon entry of the burning front into the combustion chamber.
  • a method of generat ⁇ ing a shock wave using a two-phase burning process including the steps of supplying an air fuel mixture from an air-fuel supply line to a combustion chamber, igniting the air-fuel mixture in the supply line when the combus ⁇ tion chamber is filled with a preselected amount of air- fuel mixture, thereby initiating a burning front propa ⁇ gating towards the combustion chamber and enhancing and controlling the burning process by stimulating turbulence in the combustion chamber, wherein turbulence is stimu ⁇ lated by the steps of imposing a first, predetermined, gas dynamic resistance in the combustion portion during a first, combustion, phase of the burning process and imposing a second, predetermined, gas dynamic resistance during a second, detonation, phase of the burning proc ⁇ ess, and wherein the first resistance is such that burn ⁇ ing of the air-fuel mixture during the combustion phase yields a predetermined pressure level suitable for initi ⁇ ating de
  • the second gas dynamic resistance is lower than the first gas dynamic resistance.
  • the method further includes the step of scattering the burning front substantially upon entry of the burning front into the combustion chamber.
  • a method of generating a shock wave including the steps of supplying an air fuel mixture from an air-fuel supply line to a combustion chamber, igniting the air-fuel mixture in the supply line when the combustion chamber is filled with a preselected amount of air-fuel mixture, thereby initiat ⁇ ing a burning front propagating towards the combustion chamber, enhancing and controlling the burning process by stimulating turbulence in the combustion chamber, scat ⁇ tering the burning front substantially upon entry of the burning front into the combustion chamber and detonating the air fuel mixture in the combustion chamber.
  • the method further includes the step of removing the detonat ⁇ ed mixture at an output aperture to form a gas dynamic pulse thereat.
  • apparatus for cleaning a filter including a shock wave generator which generates at least one gas dynamic pulse in a given direction and a reflector which reflects the at least one gas dynamic pulse onto at least a portion of the filter.
  • the shock wave generator used by the cleaning apparatus includes a two-phase shock wave gener ⁇ ator as described above.
  • the apparatus preferably further includes an enclo ⁇ sure for accommodating the filter.
  • the filter is prefera- bly an air filter.
  • the cleaning apparatus further including a positioning mechanism which controls the position of the reflector relative to the filter.
  • the apparatus preferably fur ⁇ ther includes a controller which controls the operation of the positioning mechanism and the activation of the shock wave generator.
  • the controller preferably operates the positioning mechanism and activates the shock wave generator in accordance with a predetermined cleaning sequence.
  • the cleaning sequence preferably includes a prede ⁇ termined number of activations of the shock wave genera ⁇ tor at each of a predetermined number of positions of the reflector relative to the filter.
  • the prede ⁇ termined number of activations of the shock wave genera ⁇ tor includes between 1 and 20 activations at each posi ⁇ tion of the reflector.
  • the filter is a cylindrical filter and the predetermined number of positions are spaced along the height of the cylindrical filter.
  • the prede ⁇ termined number of positions are spaced by a spacing of between 5 and 10 centimeters.
  • Fig. 1 is a schematic, cross-sectional, illustration of a gas dynamic pulse generator, constructed and opera ⁇ tive in accordance with a preferred embodiment of the present invention
  • Fig. 2 is a pictorial, side view, illustration of a two-phase turbulence stimulator useful for the operation of the gas dynamic generator of Fig. 1 according to a preferred embodiment of the present invention
  • Fig. 3 is a schematic, cross-sectional, illustration of a portion of a folded gas dynamic pulse generator, constructed and operative in accordance with another preferred embodiment of the present invention.
  • Fig. 4 is a schematic, cross-sectional illustration of apparatus for cleaning a filter using pulse dynamic pulse generation, constructed and operative in accordance with yet another preferred embodiment of the present invention.
  • the gas dynamic pulse generator preferably in ⁇ cludes a fuel supply line 10, an air supply line 12, a mixer 14, an air-fuel mixture carrier line 15, an igniter 16 associated with a preselected portion of carrier line 15, a perforated nozzle 18 mounted to the end of carrier line 15, a combustion chamber 20 and a two-phase turbu ⁇ lence stimulator 22 mounted in combustion chamber 22.
  • Fuel preferably a combustible gas such as Methane

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

L'invention concerne un élément de filtre (2) comprenant un corps cylindrique (4) essentiellement allongé, d'un matériau formant filtre, avec une extrémité ouverte et une extrémité fermée. L'extrémité fermée comprend une partie d'extrémité (6) de forme pleine, chevauchant le corps cylindrique (4) et son diamètre extérieur est supérieur à celui du corps cylindrique (4). L'invention traite aussi d'un procédé de production de cet élément de filtre.
PCT/SE1996/000637 1995-05-15 1996-05-14 Filtre a sacs et production de ce type de filtre Ceased WO1996036418A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU57858/96A AU5785896A (en) 1995-05-15 1996-05-14 A filter bag and production of such a filter bag

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9501793A SE504540C2 (sv) 1995-05-15 1995-05-15 Filterelement för slangfilter, framställning av ett sådant filterelement, samt dess användning
SE9501793-5 1995-05-15

Publications (1)

Publication Number Publication Date
WO1996036418A1 true WO1996036418A1 (fr) 1996-11-21

Family

ID=20398310

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000637 Ceased WO1996036418A1 (fr) 1995-05-15 1996-05-14 Filtre a sacs et production de ce type de filtre

Country Status (3)

Country Link
AU (1) AU5785896A (fr)
SE (1) SE504540C2 (fr)
WO (1) WO1996036418A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102631814A (zh) * 2012-04-12 2012-08-15 江苏精亚环境科技有限公司 无骨架圆筒形尘笼的安装结构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1265784A (fr) * 1970-02-06 1972-03-08
US4398931A (en) * 1982-05-19 1983-08-16 Minnesota Mining And Manufacturing Company Ceramic fabric filter
GB2162768A (en) * 1984-08-06 1986-02-12 Tilghman Wheelabrator Ltd Filter bag
EP0300182A1 (fr) * 1987-07-18 1989-01-25 KNECHT Filterwerke GmbH Elément filtrant tubulaire avec un tube support couvert de matière de filtrage à l'extérieur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1265784A (fr) * 1970-02-06 1972-03-08
US4398931A (en) * 1982-05-19 1983-08-16 Minnesota Mining And Manufacturing Company Ceramic fabric filter
GB2162768A (en) * 1984-08-06 1986-02-12 Tilghman Wheelabrator Ltd Filter bag
EP0300182A1 (fr) * 1987-07-18 1989-01-25 KNECHT Filterwerke GmbH Elément filtrant tubulaire avec un tube support couvert de matière de filtrage à l'extérieur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102631814A (zh) * 2012-04-12 2012-08-15 江苏精亚环境科技有限公司 无骨架圆筒形尘笼的安装结构
CN102631814B (zh) * 2012-04-12 2013-05-01 江苏精亚环境科技有限公司 无骨架圆筒形尘笼的安装结构

Also Published As

Publication number Publication date
SE9501793L (sv) 1996-11-16
AU5785896A (en) 1996-11-29
SE9501793D0 (sv) 1995-05-15
SE504540C2 (sv) 1997-03-03

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