WO1999028010A1 - Method for regulating of reverse-air pressure in bag filters - Google Patents

Method for regulating of reverse-air pressure in bag filters Download PDF

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Publication number
WO1999028010A1
WO1999028010A1 PCT/NO1998/000287 NO9800287W WO9928010A1 WO 1999028010 A1 WO1999028010 A1 WO 1999028010A1 NO 9800287 W NO9800287 W NO 9800287W WO 9928010 A1 WO9928010 A1 WO 9928010A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
pressure
chambers
reverse
air
Prior art date
Application number
PCT/NO1998/000287
Other languages
French (fr)
Inventor
Svein Gitlestad
Original Assignee
Elkem Asa
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 Elkem Asa filed Critical Elkem Asa
Priority to AU94661/98A priority Critical patent/AU9466198A/en
Publication of WO1999028010A1 publication Critical patent/WO1999028010A1/en

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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
    • B01D46/44—Auxiliary equipment or operation thereof controlling filtration
    • B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring
    • 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 a method for regulating of reverse-air pressure in bag filters.
  • bag filters all types of filters where the gas to be cleaned for solid particles passes through a filtering cloth.
  • the filter cloth is usually in the form of cylinder-shaped bags, where uncleaned gas is passed through the cloth in the filtering bags either by passing uncleaned gas into the bags and out through the filtering cloth whereby solid particles are retained on the inside of the filtering cloth, or, alternatively, by passing uncleaned gas through the filtering cloth from the outside of the bags whereby solid particles are retained on the outside of the filtering bags.
  • bag filters of the kind where uncleaned gas is passed into the filtering bags will be described, but will also apply to all other types of bag filter.
  • Bag filters usually comprises a plurality of chambers where each chamber comprises a plurality of normally vertically arranged filtering bags. Uncleaned gas is passed into the bag and passes through the filtering cloth in the walls of the bag, while the solid particles are retained inside the bags. When the filter has been in operation for some time the solid particles must be removed from the bags. This is done by disconnecting the supply of uncleaned gas to the chamber to be cleaned whereafter the bags in the disconnected chamber are cleaned by supplying cleaning gas in the opposite direction of the direction of the uncleaned gas. This method is called reverse- air cleaning.
  • the particles contained in the chamber which is being cleaned will fall down into a closed bottom hopper situated below the chamber and are thereafter transported through valves or the like to a storage silo by means of pneumatic transport or by means of other ways of transporting such as chain conveyers or other ways of mechanical transportation.
  • the reverse-air method for cleaning of chambers it is used a suction fan which is connected to the chamber to be cleaned after the supply of uncleaned gas to this chamber has been disconnected.
  • the duration of running the suction fan for each chamber is relatively short, normally between 10 and 15 seconds.
  • the suction fan is set on a fixed value regardless which of the chambers is to be cleaned. This is done by keeping the conductor rail of the suction fan in a fixed position or by running the suction fan at a fixed number of revolution per minute. This has, however, a number of drawbacks and disadvantages.
  • the pressure in these chambers will increase when the suction fan is operated with a fixed regulation. If the pressure in one or more chambers during the reverse-air cleaning becomes too high, there will be an increased risk for damages of the bags, for instance by destroying the connection between the bags and metal rings which are used to hold the bags open during the reverse-air cleaning. The consumption of filtering bags can thus become high and the maintanance costs for the bag house filter will be increased. On the other hand, if the reverse-air pressure becomes too low in one or more of the chambers, the cleaning of the filter bags will not be complete.
  • the present invention thus relates to a method for regulating the pressure in bag house filters which are cleaned by the reverse-air method, which bag house filters comprises a plurality of chambers where each chamber comprises a plurality of filtering bags, and where a suction fan is connected to the chamber which is to be cleaned, said method being characterized in that each chamber is equipped with means for measuring the air pressure during the cleaning of the chamber, that the measured pressure in the chambers is registered when the chambers are cleaned, that the pressure measured during the cleaning of a chamber is compared with a preset value for the pressure in this chamber and if the measured pressure deviates from the preset value for this chamber the settings for the suction fan for this chamber is changed during the next reverse-air cleaning of this chamber in order to obtain a pressure which is equal to the preset value.
  • the pressure in each of the chambers during the reverse-air cleaning is measured by a pressure transmitter arranged in each chamber.
  • the pressure in each of the chambers during the reverse-air cleaning is measured by means of one common pressure transmitter which is connected to all of the chambers by means of pipes and where one chamber at a time can be connected to the common pressure transmitter by opening and closing valves in the pipes.
  • the preset values for the reverse-air pressure can be set individually for each chamber. It is, however, preferred to use the same preset value for the reverse-air pressure in all of the chambers.
  • Figure 1 shows a bag house filter where the reverse-air pressure is regulated according to a first embodiment of the method of the present invention, and where,
  • Figure 2 shows a bag house filter where the reverse-air pressure is regulated according to a second embodiment of the method of the present invention
  • FIG 1 there is shown a vertical cut through a bag house filter comprising three chambers.
  • the filter building is shown with reference numeral 1.
  • three chambers 2, 3, 4 each containing one filtering bag 5, 6, 7.
  • Each of the chambers 2, 3, 4 is equipped with a bottom hopper 8, 9, 10.
  • the filtering bags 5, 6, 7 are in their upper ends suspended from the filtering building 1 and their open lower ends are connected to the bottom hoppers 8, 9, 10.
  • the chamber 4 is shown in disconnected state for installment of a new fiitering bag 7. Gas which is to be cleaned is supplied through a main fan 28 to the chambers 2, 3, 4 via pipes 11 , 12, 13 to the bottom hoppers 8, 9, 10.
  • the pipes 11 , 12, 13 are equipped with valves 14, 15, 16 for opening/closing of supply of uncleaned gas to the bottom hoppers 8, 9, 10.
  • the valve 14 On Figure 1 the valve 14 is open while the valves 15 and 16 are in closed position. Uncleaned gas is thus supplied through the pipe 11 to the bottom hopper 28 for the chamber 2 and flows upwardly through the filtering bag 5, passes through the cloth in the filtering bag 5 and into the bag house building 1. Particles contained in the uncleaned gas are retained on the inside of the filtering bag 5.
  • a reverse-air suction fan 17 is via pipes 18, 19, 20 connected to the bottom hoppers 8, 9, 10.
  • the pipes 18, 19, 20 are equipped with valves 21 , 22, 23 for opening/closing of the pipes 18, 19, 20.
  • the outlet end of the suction fan 17 is connected to the pipe for uncleaned gas.
  • the valves 21 and 23 are in closed position and the valve 22 is in open position. This means that chamber 3 is being cleaned.
  • air is being sucked from the outside of the filtering bag 6, through the bottom hopper 9 and via the suction fan 17 and into the pipe for uncleaned gas. Solid particles retained on the inside of the filtering bag 6 will during the reverse-air cleaning fall down into the bottom hopper 9 and are removed therefrom through valves or chain conveyers in conventional way.
  • pressure transmitters 24, 25, 26 are arranged in each chamber 2, 3, 4 for measuring the pressure during the cleaning of the chambers.
  • the pressure measured during the cleaning of each chamber is registered in a control unit 27, where the measured pressure is compared to a preset value for the pressure for each chamber and where the control unit 27, based on a comparison between measured pressure and the preset value for reverse-air pressure, gives a signal to the suction fan 17 to increase or decrease the amount of air next time this chamber is to be cleaned.
  • FIG. 2 shows a second embodiment of the method according to the present invention.
  • Figure 2 shows a vertical cut through a bag house filter having three chambers. Parts on Figure 2 which are identical to parts on Figure 1 have identical reference numerals.
  • the bag house filter shown on Figure 2 is identical to the baghouse filter shown on Figure 1 , except that the reverse-air pressure in each chamber 2, 3, 4 are measured by means of a common pressure transmitter 30 which is connected to the bottom hoppers 8, 9, 10 by means of pipes 31 , 32, 33 and where the pipes 31 , 32, 33 are equipped with valves 34, 35, 36 for opening and closing of the pipes 31 , 32, 33.
  • the chamber 3 is beting cleaned.
  • the pressure in the bottom hopper 9 is measured as the valve 35 is in open position and the valves 34, 36 are in closed position.
  • the measured pressure is registered in the control unit 27 where the measured pressure is compared to a preset value of the reverse-air pressure and where the control unit gives a signal to the suction fan 17 to increase or decrease the amount of air the next time the chamber is to be cleaned.

Landscapes

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

Abstract

The present invention relates to a method for regulating the pressure in bag house filters which are cleaned by the reverse-air method, which bag house filters comprise a plurality of chambers where each chamber comprises a plurality of filtering bags, and where a suction fan is connected to the chamber which is to be cleaned. Each chamber is equipped with means for measuring the air pressure during the cleaning of the chamber. The measured pressure in the chambers is registered when the chambers are cleaned and the pressure measured during the cleaning of a chamber is compared with a preset value for the pressure in this chamber. The measured pressure deviates from the preset value for this chamber the settings for the suction fan for this chamber is changed during the next reverse-air cleaning of this chamber in order to obtain a pressure which is equal to the preset value.

Description

Title of invention
Method for regulating of reverse-air pressure in bag filters.
Field of Invention The present invention relates to a method for regulating of reverse-air pressure in bag filters.
Background art
With the term "bag filters" it shall herein be understood all types of filters where the gas to be cleaned for solid particles passes through a filtering cloth. In these kinds of filters the filter cloth is usually in the form of cylinder-shaped bags, where uncleaned gas is passed through the cloth in the filtering bags either by passing uncleaned gas into the bags and out through the filtering cloth whereby solid particles are retained on the inside of the filtering cloth, or, alternatively, by passing uncleaned gas through the filtering cloth from the outside of the bags whereby solid particles are retained on the outside of the filtering bags. In the following bag filters of the kind where uncleaned gas is passed into the filtering bags will be described, but will also apply to all other types of bag filter. Bag filters usually comprises a plurality of chambers where each chamber comprises a plurality of normally vertically arranged filtering bags. Uncleaned gas is passed into the bag and passes through the filtering cloth in the walls of the bag, while the solid particles are retained inside the bags. When the filter has been in operation for some time the solid particles must be removed from the bags. This is done by disconnecting the supply of uncleaned gas to the chamber to be cleaned whereafter the bags in the disconnected chamber are cleaned by supplying cleaning gas in the opposite direction of the direction of the uncleaned gas. This method is called reverse- air cleaning.
The particles contained in the chamber which is being cleaned will fall down into a closed bottom hopper situated below the chamber and are thereafter transported through valves or the like to a storage silo by means of pneumatic transport or by means of other ways of transporting such as chain conveyers or other ways of mechanical transportation.
By the reverse-air method for cleaning of chambers it is used a suction fan which is connected to the chamber to be cleaned after the supply of uncleaned gas to this chamber has been disconnected. The duration of running the suction fan for each chamber is relatively short, normally between 10 and 15 seconds. By the conventional method for regulating the pressure provided by the suction fan, the suction fan is set on a fixed value regardless which of the chambers is to be cleaned. This is done by keeping the conductor rail of the suction fan in a fixed position or by running the suction fan at a fixed number of revolution per minute. This has, however, a number of drawbacks and disadvantages. Thus there is often a substantial physical distance between the chambers which are located closest to the suction fan and the chambers which are located at the longest distance from the suction fan. As the settings for the suction fan is fixed, the pressure provided by the suction fan will vary from chamber to chamber due to different pressure drop in the pipes from the suction fan to each chamber. Further, new filtering bags will have a lower pressure drop than filtering bags which have been in operation for some time, and this will give a lower cleaning pressure in chambers having new filtering bags than in chambers having filtering bags which have been in use for some time. After some time of operation it may also be necessary to close some of the bags in one or more chambers due to leakages in the bags and in such cases where the number of bags in one or more chambers are fewer than normal, the pressure in these chambers will increase when the suction fan is operated with a fixed regulation. If the pressure in one or more chambers during the reverse-air cleaning becomes too high, there will be an increased risk for damages of the bags, for instance by destroying the connection between the bags and metal rings which are used to hold the bags open during the reverse-air cleaning. The consumption of filtering bags can thus become high and the maintanance costs for the bag house filter will be increased. On the other hand, if the reverse-air pressure becomes too low in one or more of the chambers, the cleaning of the filter bags will not be complete.
Disclosure of invention By the present invention one has arrived at a method which solves the above mentioned problems which exists in bag house filters which uses a common suction fan for reverse-air cleaning.
The present invention thus relates to a method for regulating the pressure in bag house filters which are cleaned by the reverse-air method, which bag house filters comprises a plurality of chambers where each chamber comprises a plurality of filtering bags, and where a suction fan is connected to the chamber which is to be cleaned, said method being characterized in that each chamber is equipped with means for measuring the air pressure during the cleaning of the chamber, that the measured pressure in the chambers is registered when the chambers are cleaned, that the pressure measured during the cleaning of a chamber is compared with a preset value for the pressure in this chamber and if the measured pressure deviates from the preset value for this chamber the settings for the suction fan for this chamber is changed during the next reverse-air cleaning of this chamber in order to obtain a pressure which is equal to the preset value.
According to an embodiment of the method according to the present invention the pressure in each of the chambers during the reverse-air cleaning is measured by a pressure transmitter arranged in each chamber.
According to another embodiment of the method according to the present invention, the pressure in each of the chambers during the reverse-air cleaning is measured by means of one common pressure transmitter which is connected to all of the chambers by means of pipes and where one chamber at a time can be connected to the common pressure transmitter by opening and closing valves in the pipes. The preset values for the reverse-air pressure can be set individually for each chamber. It is, however, preferred to use the same preset value for the reverse-air pressure in all of the chambers.
By the method according to the present invention one will always obtain a substantially constant reverse-air pressure in each chamber corresponding to the preset pressure value. Even if one or more filtering bags in one chamber have to be closed, the reverse-air pressure in this chamber will not increase, but be kept at the preset value. It is thereby avoided that the reverse-air pressure in a chamber becomes so high that the remaining filtering bags are damaged or destroyed.
Brief description of the drawings Figure 1 shows a bag house filter where the reverse-air pressure is regulated according to a first embodiment of the method of the present invention, and where,
Figure 2 shows a bag house filter where the reverse-air pressure is regulated according to a second embodiment of the method of the present invention
Detailed description of the drawings
On Figure 1 there is shown a vertical cut through a bag house filter comprising three chambers. The filter building is shown with reference numeral 1. For simplicity it is shown three chambers 2, 3, 4 each containing one filtering bag 5, 6, 7. Each of the chambers 2, 3, 4 is equipped with a bottom hopper 8, 9, 10. The filtering bags 5, 6, 7 are in their upper ends suspended from the filtering building 1 and their open lower ends are connected to the bottom hoppers 8, 9, 10. On Figure 1 the chamber 4 is shown in disconnected state for installment of a new fiitering bag 7. Gas which is to be cleaned is supplied through a main fan 28 to the chambers 2, 3, 4 via pipes 11 , 12, 13 to the bottom hoppers 8, 9, 10. The pipes 11 , 12, 13 are equipped with valves 14, 15, 16 for opening/closing of supply of uncleaned gas to the bottom hoppers 8, 9, 10. On Figure 1 the valve 14 is open while the valves 15 and 16 are in closed position. Uncleaned gas is thus supplied through the pipe 11 to the bottom hopper 28 for the chamber 2 and flows upwardly through the filtering bag 5, passes through the cloth in the filtering bag 5 and into the bag house building 1. Particles contained in the uncleaned gas are retained on the inside of the filtering bag 5.
A reverse-air suction fan 17 is via pipes 18, 19, 20 connected to the bottom hoppers 8, 9, 10. The pipes 18, 19, 20 are equipped with valves 21 , 22, 23 for opening/closing of the pipes 18, 19, 20. The outlet end of the suction fan 17 is connected to the pipe for uncleaned gas. On Figure 1 the valves 21 and 23 are in closed position and the valve 22 is in open position. This means that chamber 3 is being cleaned. During the cleaning, air is being sucked from the outside of the filtering bag 6, through the bottom hopper 9 and via the suction fan 17 and into the pipe for uncleaned gas. Solid particles retained on the inside of the filtering bag 6 will during the reverse-air cleaning fall down into the bottom hopper 9 and are removed therefrom through valves or chain conveyers in conventional way.
According to the present invention pressure transmitters 24, 25, 26 are arranged in each chamber 2, 3, 4 for measuring the pressure during the cleaning of the chambers. The pressure measured during the cleaning of each chamber is registered in a control unit 27, where the measured pressure is compared to a preset value for the pressure for each chamber and where the control unit 27, based on a comparison between measured pressure and the preset value for reverse-air pressure, gives a signal to the suction fan 17 to increase or decrease the amount of air next time this chamber is to be cleaned.
On Figure 2 it is shown a second embodiment of the method according to the present invention. Figure 2 shows a vertical cut through a bag house filter having three chambers. Parts on Figure 2 which are identical to parts on Figure 1 have identical reference numerals. The bag house filter shown on Figure 2 is identical to the baghouse filter shown on Figure 1 , except that the reverse-air pressure in each chamber 2, 3, 4 are measured by means of a common pressure transmitter 30 which is connected to the bottom hoppers 8, 9, 10 by means of pipes 31 , 32, 33 and where the pipes 31 , 32, 33 are equipped with valves 34, 35, 36 for opening and closing of the pipes 31 , 32, 33. On Figure 2 the chamber 3 is beting cleaned. The pressure in the bottom hopper 9 is measured as the valve 35 is in open position and the valves 34, 36 are in closed position. In the same way as described in connection with the embodiment shown in Figure 1 , the measured pressure is registered in the control unit 27 where the measured pressure is compared to a preset value of the reverse-air pressure and where the control unit gives a signal to the suction fan 17 to increase or decrease the amount of air the next time the chamber is to be cleaned.

Claims

Claims
1. Method for regulating the pressure in bag house filters which are cleaned by the reverse-air method, which bag house filters comprises a plurality of chambers where each chamber comprises a plurality of filtering bags, and where a suction fan is connected to the chamber which is to be cleaned, characte rize d i n that each chamber is equipped with means for measuring the air pressure during the cleaning of the chamber, that the measured pressure in the chambers is registered when the chambers are cleaned, that the pressure measured during the cleaning of a chamber is compared with a preset value for the pressure in this chamber and if the measured pressure deviates from the preset value for this chamber the settings for the suction fan for this chamber is changed during the next reverse-air cleaning of this chamber in order to obtain a pressure which is equal to the preset value.
2. Method according to claim 1, c h a racte ri ze d i n that the pressure in each of the chambers during the reverse-air cleaning is measured by a pressure transmitter arranged in each chamber.
3. Method according to claim ^ c h a ra ct e ri ze d i n that the pressure in each of the chambers during the reverse-air cleaning is measured by means of one common pressure transmitter which is connected to all of the chambers by means of pipes and where one chamber at a time can be connected to the common pressure transmitter by opening and closing valves in the pipes.
4. Method according to claims 1 -3, characterized in that the preset values for the reverse-air pressure are the same for all chambers.
PCT/NO1998/000287 1997-12-04 1998-09-30 Method for regulating of reverse-air pressure in bag filters WO1999028010A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU94661/98A AU9466198A (en) 1997-12-04 1998-09-30 Method for regulating of reverse-air pressure in bag filters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO975645A NO305688B1 (en) 1997-12-04 1997-12-04 Procedure for controlling purge pressure in bag filter
NO19975645 1997-12-04

Publications (1)

Publication Number Publication Date
WO1999028010A1 true WO1999028010A1 (en) 1999-06-10

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ID=19901409

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1998/000287 WO1999028010A1 (en) 1997-12-04 1998-09-30 Method for regulating of reverse-air pressure in bag filters

Country Status (4)

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AU (1) AU9466198A (en)
NO (1) NO305688B1 (en)
WO (1) WO1999028010A1 (en)
ZA (1) ZA9810991B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001054797A1 (en) * 2000-01-31 2001-08-02 Alstom Power N.V. A method when cleaning a filter
CN104984623A (en) * 2015-07-10 2015-10-21 苏州华达仪器设备有限公司 Filter structure for convenient cleaning
DE102015213742A1 (en) 2015-07-21 2015-10-29 Wacker Chemie Ag Method for chamber cleaning of an emission control system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0587146A2 (en) * 1992-09-09 1994-03-16 Firma J. Eberspächer Method and device for determination of the loading state of particle filters
EP0788826A1 (en) * 1996-02-07 1997-08-13 Ngk Insulators, Ltd. Control system for reverse washing mechanism in dust collecting apparatus
EP0796645A1 (en) * 1996-03-20 1997-09-24 ALOIS SCHEUCH GESELLSCHAFT m.b.H. Method for controlling the cleaning of filters for separation of particles and device for carrying out this method
WO1997040916A1 (en) * 1996-04-29 1997-11-06 Elkem Asa Device for bag house filter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0587146A2 (en) * 1992-09-09 1994-03-16 Firma J. Eberspächer Method and device for determination of the loading state of particle filters
EP0788826A1 (en) * 1996-02-07 1997-08-13 Ngk Insulators, Ltd. Control system for reverse washing mechanism in dust collecting apparatus
EP0796645A1 (en) * 1996-03-20 1997-09-24 ALOIS SCHEUCH GESELLSCHAFT m.b.H. Method for controlling the cleaning of filters for separation of particles and device for carrying out this method
WO1997040916A1 (en) * 1996-04-29 1997-11-06 Elkem Asa Device for bag house filter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001054797A1 (en) * 2000-01-31 2001-08-02 Alstom Power N.V. A method when cleaning a filter
AU771570B2 (en) * 2000-01-31 2004-03-25 General Electric Technology Gmbh A method when cleaning a filter
US6749665B2 (en) 2000-01-31 2004-06-15 Alstom Power N.V. Method when cleaning a filter
CN104984623A (en) * 2015-07-10 2015-10-21 苏州华达仪器设备有限公司 Filter structure for convenient cleaning
DE102015213742A1 (en) 2015-07-21 2015-10-29 Wacker Chemie Ag Method for chamber cleaning of an emission control system

Also Published As

Publication number Publication date
AU9466198A (en) 1999-06-16
ZA9810991B (en) 2000-06-01
NO975645L (en) 1999-06-07
NO305688B1 (en) 1999-07-12
NO975645D0 (en) 1997-12-04

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