WO1993013845A1 - A method and apparatus for cleaning the cloth in bag filters - Google Patents

A method and apparatus for cleaning the cloth in bag filters Download PDF

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Publication number
WO1993013845A1
WO1993013845A1 PCT/NO1993/000010 NO9300010W WO9313845A1 WO 1993013845 A1 WO1993013845 A1 WO 1993013845A1 NO 9300010 W NO9300010 W NO 9300010W WO 9313845 A1 WO9313845 A1 WO 9313845A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
filter bags
cleaning
tube
venturi
Prior art date
Application number
PCT/NO1993/000010
Other languages
French (fr)
Inventor
Ola Rindal
Original Assignee
Ola Rindal
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 Ola Rindal filed Critical Ola Rindal
Publication of WO1993013845A1 publication Critical patent/WO1993013845A1/en

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
    • B01D46/04—Cleaning filters
    • 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
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/4281—Venturi's or systems showing a venturi effect
    • 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
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
    • 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
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
    • B01D46/71—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
    • 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
    • B01D46/90—Devices for taking out of action one or more units of multi-unit filters, e.g. for regeneration or maintenance

Definitions

  • the present invention relates to an apparatus and a method for cleaning the cloth in bag filters.
  • the filter bags which usually are round or flat
  • the bags are stretched over wire baskets or aluminum profiles to hold them open, and the direction of flow for the gas to be filtered is from the outside and into the bag. Filtered gas flows upward on the inside of the bags and up into the filter's clean gas side at
  • valves 30 valves.
  • the selection of valves will be a compromise between pressure loss and costs. With the proper dimensions and configuration, this method yields a high intensity of cleaning. It has a tendency, however, to cause a relatively heavy spillage of dust due to the high flow rate through the
  • the second method that is used is the mechanical reversal of purified gas through the. bags with the aid of a rotating nozzle driven stepwise by an electromotor via a ratchet wheel.
  • the sections from the filtration are connected one by one, as cleaned gas or air is simultaneously sucked or pressed back through the bags.
  • This method provides for gentle cleaning and little dust spillage.
  • the method yields a lower intensity cleaning of the cloth and is particularly suitable for the simpler types of filtrable dust such as, e.g., dust produced from crushing or drying of rock or the like. There may easily occur a high pressure drop on filtration of sticky and fine-grained dust types.
  • An advantage of this method is its simple and uncomplicated functioning, involving few movable parts.
  • the present invention is a cross between the two previously mentioned principles.
  • the cleaning takes place in a way such that the advantages of the above described compressed air principle — i.e., high intensity cleaning — are combined with the return air principle's simplicity and need for only a few movable parts.
  • advantages are achieved such as a minimal consumption of energy and a good control of the flow rate through the cloth after cleaning.
  • apparatus that are characterized by an apparatus for cleaning filter bags by reverse flushing of the filter bags with a gas, which filter bags are arranged in sections comprising one or more filter bags, which sections are connected to the cleaning apparatus by ducts arranged in a circle around the
  • nozzle tube 20 apparatus comprising a circular, stationary port tube having ports disposed at each of the ducts, a rotating nozzle tube having a nozzle, which nozzle tube is disposed on the inside of the port tube, a venturi/ejector provided on the outside of the port tube and connected with the nozzle tube
  • nozzle tube and venturi/ejector are adapted for stepwise rotation with the aid of an advancing means.
  • the advancing means comprises a gear wheel and an eccentric
  • the apparatus also comprises a flow equalizer that limits the gas flow through the filter sections, which flow equalizer comprises an arcuate plate having a radius that is
  • the flow equalizer comprises, as one alternative, an arcuate plate having a radius that is approximately equal to the distance between the shaf and the openings in the ducts, which flow equalizer has a height greater at the end proximate to the venturi/ejector than at the other end of the plate.
  • the invention also relates to a method for cleaning filter bags by reverse flushing of the filter bags with a gas, which filter bags are arranged in sections comprising one or more filter bags, which sections are connected to the cleaning apparatus by ducts arranged in a circle around the apparatus, which method is characterized in that the apparatus is intermittently supplied with gas under pressure from an accumulator/pressure vessel connected with a compressor/fan, which apparatus comprises a stationary port tube having a port for each duct, a rotating nozzle tube having a nozzle connected by an arm to a rotating ejector/- venturi, where the rotating parts are driven stepwise with the aid of an advancing means in such manner that when the nozzle is in a position between two adjacent ports, there will be no gas flow through the apparatus, thus causing a pressure build-up in the accumulator/pressure vessel, and when the nozzle is in a position of alignment with the ports, there will be a flow of gas through the apparatus.
  • Fig. 1 is a view from above of the apparatus in accordance with the invention mounted on a bag filter cleaning system.
  • Fig. 2 is a side view of the cleaning system in Fig. 1, in partial section.
  • Fig. 3 is a side view of a section through the apparatus in accordance with the invention.
  • Fig. 4 is a view of a section through the apparatus in accordance with Fig. 3.
  • Fig. 5 is view of an embodiment form of the apparatus in accordance with Fig. 1 - 4.
  • Fig. 6 is an alternative embodiment form of the apparatus in Fig. 1 - 4.
  • Each filter section is connected to
  • pressure vessel/accumulator 3 is connected with a pressure vessel/accumulator 3.
  • This pressure vessel/accumulator 3 is supplied with compressed air at low pressure, e.g., 0.3 - 3 bar, from a blower/compressor 5. In pressure vessel 3 the pressure builds up between each
  • nozzle 15 on rotating nozzle tube 7 will alternate between a position where it is in alignment with port 9 on port tube 8 and a position between ports 9 on port tube 8.
  • nozzle 15 is in a position between ports 9, there will be no air flow out of nozzle 15, and the pressure
  • the cleaning apparatus in accordance with the invention, cleaning of the bags will take place at uniform intervals from section to section. This means that the time period for a rotation (revolution) of the rotating nozzle tube 7 corre ⁇ sponds to the cleaning cycle for the entire filter.
  • the cleaning apparatus may be provided with a flow equalizer for the filtration rate through the cloth of the bag. As soon as the filter cloth has been cleaned, there will be a much higher flow rate through the bag than immediately prior to the cleaning of the bag section in question. This means that a newly cleaned bag cloth is subjected to a much higher load, which results in increased wear and higher rate of dust passage.
  • the flow equalizer therefore represents a substantial improvement of the filter function. Examples of such flow equalizers are shown in Figs. 5 and 6.
  • flow equalizer 16 is an arcuate plate mounted in the direction of rotation behind the ejector/venturi 10.
  • the distance to the openings to cleaning ducts 4 is smaller in the area right by the ejector/venturi 10 than, for example 180° away from the ejector/venturi.
  • a second embodiment form of flow equalizer 16 consists of an arcuate plate having a uniform distance from cleaning ducts 4. The height of plate 16 is greater in the area immediately by ejector/venturi 10 than, for example, at 180°. Thus, a greater flow resistance is achieved at the sections that have just been cleaned than at the sections that have been in operation for some time.

Abstract

There is described an apparatus for cleaning filter bags (1) by reverse flushing of the filter bags (1) with a gas, which filter bags (1) are arranged in sections comprising one or more filter bags (1), which sections are connected to the cleaning apparatus (2) by ducts (4) which are arranged in a circle around the appartus (2). The apparatus (2) comprises a circular, stationary port tube (8) having ports (9) disposed at each of the ducts (4), a rotating nozzle tube (7) having a nozzle (15), which nozzle tube (7) is disposed on the inside of the port tube (8), a venturi/ejector (10) provided on the outside of the port tube (8) and connected with the nozzle tube (7) by means of an arm (11), which nozzle tube (7) and venturi/ejector (10) are adapted for stepwise rotation with the aid of an advancing means. There is also described a method which utilizes the apparatus.

Description

A METHOD AND APPARATUS FOR CLEANING THE CLOTH IN BAG FILTERS.
The present invention relates to an apparatus and a method for cleaning the cloth in bag filters.
V Common bag filters are used in the dry separation of dust
I ' from gases. The filter bags, which usually are round or flat
K with sewn channels, are fastened at the top with the opening
10 toward the outlet for the cleaned gas. The bags are stretched over wire baskets or aluminum profiles to hold them open, and the direction of flow for the gas to be filtered is from the outside and into the bag. Filtered gas flows upward on the inside of the bags and up into the filter's clean gas side at
15 the top. This is divided into a plurality of sections. For cleaning of the bags, they are blown clean by means of a short, powerful reversal of gas, section by section, through the bags.
The dust cover on the outside of the bags will thus be
20 loosened and will fall down into the filter's base hopper.
Almost all known modern filter types are cleaned by means of intermittent reversal of gas through the bags. Currently this is done primarily in two ways. In the first method the
25 reversal is done with compressed air and ejectors positioned over each individual bag. The pulses of compressed air are generated with the aid of electrically/pneumatically controlled valves for each row of bags. This means that a medium sized filter will easily have as many as 20-40
30 valves. The selection of valves will be a compromise between pressure loss and costs. With the proper dimensions and configuration, this method yields a high intensity of cleaning. It has a tendency, however, to cause a relatively heavy spillage of dust due to the high flow rate through the
35 filter cloth in the initial phase following the cleaning. Use of compressed air at a pressure of about 5 - 8 bar also entails the risk of moisture formation and its concomitant unfavorable effect on valves and bags.
The second method that is used is the mechanical reversal of purified gas through the. bags with the aid of a rotating nozzle driven stepwise by an electromotor via a ratchet wheel. In this method, the sections from the filtration are connected one by one, as cleaned gas or air is simultaneously sucked or pressed back through the bags. This method provides for gentle cleaning and little dust spillage. The method yields a lower intensity cleaning of the cloth and is particularly suitable for the simpler types of filtrable dust such as, e.g., dust produced from crushing or drying of rock or the like. There may easily occur a high pressure drop on filtration of sticky and fine-grained dust types. An advantage of this method is its simple and uncomplicated functioning, involving few movable parts.
The present invention is a cross between the two previously mentioned principles. With the present invention the cleaning takes place in a way such that the advantages of the above described compressed air principle — i.e., high intensity cleaning — are combined with the return air principle's simplicity and need for only a few movable parts. At the same time, advantages are achieved such as a minimal consumption of energy and a good control of the flow rate through the cloth after cleaning.
The method and apparatus in accordance with the invention has the following advantages over known systems for the cleaning of bag filters:
- High cleaning intensity
- High degree of operational safety due to the need for few movable parts - Low energy consumption compared with known methods, partly due to a long and conveniently shaped ejector/- venturi, and partly and primarily due to the fact that the compressed air valve and the discharge nozzle are produced as one unit. This means that the entire compressor pressure is converted to velocity at the moment of discharge, i.e., without any loss in the valves or the 5 like.
Large flow area for ports and nozzles. This permits ^ the use of low pressure for the primary air, which again leads to a more uniform filling of the bags on cleaning
A < (without pressure waves like those that the high pressure
10 air would cause). Moreover, the low pressure air will not introduce problems of water precipitation, with the difficulties this may cause.
These and other advantages are achieved by a method and an
15 apparatus that are characterized by an apparatus for cleaning filter bags by reverse flushing of the filter bags with a gas, which filter bags are arranged in sections comprising one or more filter bags, which sections are connected to the cleaning apparatus by ducts arranged in a circle around the
20 apparatus, comprising a circular, stationary port tube having ports disposed at each of the ducts, a rotating nozzle tube having a nozzle, which nozzle tube is disposed on the inside of the port tube, a venturi/ejector provided on the outside of the port tube and connected with the nozzle tube
25 by means of an arm, which nozzle tube and venturi/ejector are adapted for stepwise rotation with the aid of an advancing means.
The advancing means comprises a gear wheel and an eccentric
30 mechanism.
The apparatus also comprises a flow equalizer that limits the gas flow through the filter sections, which flow equalizer comprises an arcuate plate having a radius that is
35 smaller than the distance from the shaft of the apparatus to the openings in the ducts, which flow equalizer is mounted at the ejector/venturi . The flow equalizer comprises, as one alternative, an arcuate plate having a radius that is approximately equal to the distance between the shaf and the openings in the ducts, which flow equalizer has a height greater at the end proximate to the venturi/ejector than at the other end of the plate.
The invention also relates to a method for cleaning filter bags by reverse flushing of the filter bags with a gas, which filter bags are arranged in sections comprising one or more filter bags, which sections are connected to the cleaning apparatus by ducts arranged in a circle around the apparatus, which method is characterized in that the apparatus is intermittently supplied with gas under pressure from an accumulator/pressure vessel connected with a compressor/fan, which apparatus comprises a stationary port tube having a port for each duct, a rotating nozzle tube having a nozzle connected by an arm to a rotating ejector/- venturi, where the rotating parts are driven stepwise with the aid of an advancing means in such manner that when the nozzle is in a position between two adjacent ports, there will be no gas flow through the apparatus, thus causing a pressure build-up in the accumulator/pressure vessel, and when the nozzle is in a position of alignment with the ports, there will be a flow of gas through the apparatus.
The invention will be described in more detail in the -following, with reference to the accompanying drawings of preferred embodiment forms.
Fig. 1 is a view from above of the apparatus in accordance with the invention mounted on a bag filter cleaning system.
Fig. 2 is a side view of the cleaning system in Fig. 1, in partial section. Fig. 3 is a side view of a section through the apparatus in accordance with the invention.
Fig. 4 is a view of a section through the apparatus in accordance with Fig. 3.
Fig. 5 is view of an embodiment form of the apparatus in accordance with Fig. 1 - 4.
I
<
10 Fig. 6 is an alternative embodiment form of the apparatus in Fig. 1 - 4.
In Figures 1 to 4 is shown a cleaj »ng system with filter bags
1 arranged in sections. Each filter section is connected to
15 the cleaning apparatus 2 by ducts 4. The cleaning apparatus
2 is connected with a pressure vessel/accumulator 3. This pressure vessel/accumulator 3 is supplied with compressed air at low pressure, e.g., 0.3 - 3 bar, from a blower/compressor 5. In pressure vessel 3 the pressure builds up between each
20 cleaning pulse. From vessel 3, the compressed air flows into a pressure chamber 6, the bottom part of which is made up of a stepwise rotating nozzle tube 7. Exterior to nozzle tube 7 is a fixed port tube 8 having a port 9 for each of the ducts 4. On the outside of port tube 8 is mounted a venturi/ejec¬
25 tor 10 which is connected via an arm 11 to the shaft 12 of nozzle tube 7, such that the venturi/ejector follows the rotational movement of nozzle tube 7. The entire rotating apparatus is advanced stepwise with the aid of an eccentric mechanism 13 and a gear wheel 14. On rotation of the
30 rotating apparatus, nozzle 15 on rotating nozzle tube 7 will alternate between a position where it is in alignment with port 9 on port tube 8 and a position between ports 9 on port tube 8. When nozzle 15 is in a position between ports 9, there will be no air flow out of nozzle 15, and the pressure
35 in vessel 3 will build up. When nozzle 15 is in a position of alignment with port 9, primary air and secondary gas will flow to the e ector/venturi 10 and, in return, against the direction of filtration through one bag section at a time.
With the cleaning apparatus in accordance with the invention, cleaning of the bags will take place at uniform intervals from section to section. This means that the time period for a rotation (revolution) of the rotating nozzle tube 7 corre¬ sponds to the cleaning cycle for the entire filter. This means that the cleaning apparatus may be provided with a flow equalizer for the filtration rate through the cloth of the bag. As soon as the filter cloth has been cleaned, there will be a much higher flow rate through the bag than immediately prior to the cleaning of the bag section in question. This means that a newly cleaned bag cloth is subjected to a much higher load, which results in increased wear and higher rate of dust passage. The flow equalizer therefore represents a substantial improvement of the filter function. Examples of such flow equalizers are shown in Figs. 5 and 6.
An embodiment form of the flow equalizer 16 is shown in Fig. 5. Here, flow equalizer 16 is an arcuate plate mounted in the direction of rotation behind the ejector/venturi 10. The distance to the openings to cleaning ducts 4 is smaller in the area right by the ejector/venturi 10 than, for example 180° away from the ejector/venturi. There is thus created a resistance for the outflow of filtered gas that is higher immediately behind the ejector/venturi (with newly cleaned cloths) than, for example, at 180°. It should be noted that this angle is given as an example and is therefore not a limiting feature for the invention.
In Fig. 6 there is shown a second embodiment form of flow equalizer 16. This flow equalizer 16 consists of an arcuate plate having a uniform distance from cleaning ducts 4. The height of plate 16 is greater in the area immediately by ejector/venturi 10 than, for example, at 180°. Thus, a greater flow resistance is achieved at the sections that have just been cleaned than at the sections that have been in operation for some time.
It should be noted that many variations and changes may be made in the apparatus without deviating from the invention's scope of protection as defined in the accompanying claims. All stated parameters such as, e.g., pressure, angles, etc., are provided merely for the purpose of exemplifying the invention and therefore may vary within large ranges. Similarly, there may be used gases other than air to clean the filter bags.

Claims

P a t e n t C l a i m s
1.
An apparatus for cleaning filter bags (1) by reverse flushing of the filter bags (1) with a gas, which filter bags (1) are arranged in sections comprising one or more filter bags (1), which sections are connected to the cleaning apparatus (2) by ducts (4) arranged in a circle around the apparatus (2), c h a r a c t e r i z e d i n that the apparatus (2) comprises a circular, stationary port tube (8) having ports (9) disposed at each of the ducts (4), a rotating nozzle tube (7) having a nozzle (15), which nozzle tube (7) is disposed on the inside of the port tube (8), a venturi/ejector (10) provided on the outside of the port tube (8) and connected with the nozzle tube (7) by means of an arm (11), which nozzle tube (7) and venturi/ejector (10) are adapted for stepwise rotation with the aid of an advancing means.
2.
The apparatus in accordance with claim 1, c h a r a c t e r i z e d i n that the advancing means comprises a gear wheel (14) and an eccentric mechanism (13).
3.
The apparatus in accordance with claim 1 or 2, c h a r a c t e r i z e d i n that it comprises a flow equalizer (16) which limits the gas flow through the filter sections.
4.
The apparatus in accordance with claim 3, c h a r a c t e r i z e d i n that the flow equalizer (16) comprises an arcuate plate having a radius that is smaller than the distance from the shaft (12) of the apparatus to the openings in the ducts (4), which flow equalizer (16) is mounted at the ejector/venturi (10).
5.
The apparatus in accordance with claim 3, c h a r a c t e r i z e d i n that the flow equalizer (16) comprises an arcuate plate having a radius that is approxi¬ mately equal to the distance between the shaft (12) and the openings in the ducts (4), which flow equalizer (16) has a height greater at the end proximate to the venturi/ejector (10) than at the other end of the plate.
6.
A method for cleaning filter bags (1) by reverse flushing of the filter bags (1) with a gas, which filter bags (1) are arranged in sections comprising one or more filter bags (1), which sections are connected to the cleaning apparatus (2) by ducts (4) arranged in a circle around the apparatus (2), c h a r a c t e r i z e d i n that the apparatus (2) is intermittently supplied with gas under pressure from an accumulator/pressure vessel (3) connected with a compressor/- f n (5), which apparatus (2) comprises a stationary port tube (8) having a port (9) for each duct (4), a rotating nozzle tube (7) having a nozzle (15) connected by an arm (11) to a rotating ejector/venturi (10), where the rotating parts (7, 10, 11) are driven stepwise with the aid of an advancing means in such manner that when the nozzle (15) is in a position between two adjacent ports (9), there will be no gas flow through the apparatus, thus causing a pressure build-up in the accumulator/pressure vessel (3), and when the nozzle (15) is in a position of alignment with the ports (9), there will be a flow of gas through the apparatus (2).
PCT/NO1993/000010 1992-01-16 1993-01-14 A method and apparatus for cleaning the cloth in bag filters WO1993013845A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO920214 1992-01-16
NO920214A NO175738C (en) 1992-01-16 1992-01-16 Method and apparatus for cloth cleaning in bag filters

Publications (1)

Publication Number Publication Date
WO1993013845A1 true WO1993013845A1 (en) 1993-07-22

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ID=19894783

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1993/000010 WO1993013845A1 (en) 1992-01-16 1993-01-14 A method and apparatus for cleaning the cloth in bag filters

Country Status (3)

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AU (1) AU3369693A (en)
NO (1) NO175738C (en)
WO (1) WO1993013845A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0761280A2 (en) * 1995-09-05 1997-03-12 Idr Holding S.A. System for cleaning tubular filter elements
WO1997040916A1 (en) * 1996-04-29 1997-11-06 Elkem Asa Device for bag house filter
WO1997048474A1 (en) * 1996-06-19 1997-12-24 Moon Chan Park Apparatus and method for continuously purifying gas with continuously cleaning filter, and package-type filter
WO1998001209A1 (en) * 1996-07-09 1998-01-15 Rainer Minwegen Fibrous filter with pressurised air cleaning system for cleaning of dust-laden gases
WO2001034277A1 (en) * 1999-11-05 2001-05-17 Southern Research Institute Apparatus and method for improved pulse-jet cleaning of industrial filters
US7267803B2 (en) 2000-06-19 2007-09-11 Borealis Technology Oy Degassing apparatus
WO2010148438A1 (en) * 2009-06-23 2010-12-29 Outotec Oyj Slotted inductor
EP2913091A1 (en) 2014-02-26 2015-09-02 Alstom Technology Ltd Fabric filter system and method for cleaning the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3541764A (en) * 1968-10-23 1970-11-24 Nils Osten Astrom Multi-stage dust separator
DE2011633A1 (en) * 1969-03-11 1970-12-23 Stansted Filtration Ltd., Bishop's Stortford, Hertfordshire; Akenhead, Albert, Harlow, Essex; (Großbritannien) Gas filter device
DE1607685A1 (en) * 1967-11-04 1972-01-05 Schreiber Geb Maus Ilse Dedusting filter system
US4462916A (en) * 1981-04-03 1984-07-31 Societe d'Exploitation des Establissements Multi-element filter with rotary backwash arm

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1607685A1 (en) * 1967-11-04 1972-01-05 Schreiber Geb Maus Ilse Dedusting filter system
US3541764A (en) * 1968-10-23 1970-11-24 Nils Osten Astrom Multi-stage dust separator
DE2011633A1 (en) * 1969-03-11 1970-12-23 Stansted Filtration Ltd., Bishop's Stortford, Hertfordshire; Akenhead, Albert, Harlow, Essex; (Großbritannien) Gas filter device
US4462916A (en) * 1981-04-03 1984-07-31 Societe d'Exploitation des Establissements Multi-element filter with rotary backwash arm

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0761280A2 (en) * 1995-09-05 1997-03-12 Idr Holding S.A. System for cleaning tubular filter elements
EP0761280A3 (en) * 1995-09-05 1997-08-27 Idr Holding Sa System for cleaning tubular filter elements
WO1997040916A1 (en) * 1996-04-29 1997-11-06 Elkem Asa Device for bag house filter
WO1997048474A1 (en) * 1996-06-19 1997-12-24 Moon Chan Park Apparatus and method for continuously purifying gas with continuously cleaning filter, and package-type filter
WO1998001209A1 (en) * 1996-07-09 1998-01-15 Rainer Minwegen Fibrous filter with pressurised air cleaning system for cleaning of dust-laden gases
WO2001034277A1 (en) * 1999-11-05 2001-05-17 Southern Research Institute Apparatus and method for improved pulse-jet cleaning of industrial filters
US6309447B1 (en) 1999-11-05 2001-10-30 Southern Research Institute Apparatus and method for improved pulse-jet cleaning of industrial filters
US7267803B2 (en) 2000-06-19 2007-09-11 Borealis Technology Oy Degassing apparatus
WO2010148438A1 (en) * 2009-06-23 2010-12-29 Outotec Oyj Slotted inductor
EP2913091A1 (en) 2014-02-26 2015-09-02 Alstom Technology Ltd Fabric filter system and method for cleaning the same
US9656200B2 (en) 2014-02-26 2017-05-23 Geneal Electric Technology GmbH Fabric filter system and method for cleaning the same

Also Published As

Publication number Publication date
AU3369693A (en) 1993-08-03
NO175738B (en) 1994-08-22
NO920214D0 (en) 1992-01-16
NO175738C (en) 1995-05-04
NO920214L (en) 1993-07-19

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