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
  • B01D46/56—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
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
  • B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
  • B01D2273/28—Making use of vacuum or underpressure

Definitions

• the present invention relates to a device for bag house filters used for removing solid particles from gases and more specifically a device for use in connection with cleaning of the bags in such bag house filters and for transport of particles removed from the gas.
• bag house filters any filter where the gas to be cleaned for solid particles is passed through a filtering medium.
• the filtering medium is usually a woven or non-woven cloth, but the filtering medium can also be a porous ceramic material, normally in the form of ceramic tubes, and sand-based filtering medium.
• the filtering cloth is usually in the form of bags where uncleaned gas is passed through the filtering cloth, either by supplying uncleaned gas into the bags and passing the gas through the filtering cloth whereby solid particles are retained on the inside of the filtering cloth, or by passing uncleaned gas through the filtering cloth from the outside, whereby the solid particles are retained on the outside of the filter bag.
• bag house filters of the kind where uncleaned gas is supplied into the bags, but will be true also for other kinds of bag house filters as defined herein.
• Bag house filters are each made up of a plurality of chambers, each chamber containing a plurality of normally, vertically arranged filter bags. Uncleaned gas is supplied into the bags and the gas is passed through the material in the bags, while the solid particles are retained on the inside of the bags. After having been in operation for a certain period of time, the bags have to be cleaned for solid particles. This is done by disconnecting the supply of uncleaned gas to the chamber to be cleaned whereafter the bag in the disconnected chamber is cleaned by supplying cleaning gas in the opposite direction of the direction of the uncleaned gas. This can be done in a number of ways.
• the particles contained in the chamber which is 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 conveyer or other ways of mechanical transport.
• the known methods for cleaning of the filter bags and for transporting the collected particles from the bottom hoppers to the silo have a number of drawbacks.
• all the known systems are based on the use of separate systems for cleaning of the filter bags and for transport of the particles from the bottom hoppers to the silo.
• each chamber In order to clean the filter bags in the chambers, each chamber has to be equipped with separate valves for opening and closing of cleaning gas to the chamber. Further the cleaning gas will, after having passed through the bags in the chamber which are being cleaned, contain a substantial amount of particles and must therefore be returned to the filter for cleaning. This gives an additional dust load on the filter.
• each of the bottom hoppers must be equipped with means for transporting particles from the hoppers.
• the present invention relates to a device for bag house filters for cleaning of gases containing solid particles said filter comprising at least two chambers each chamber containing a plurality of filter bags and where a bottom hopper is arranged below each chamber, wherein a distribution device having an inlet opening for uncleaned gas and separate openings connected to each of the bottom hoppers, a device for closing of uncleaned gas to one at a time of the openings in the distribution device connected to each of the bottom hoppers and for simultaneously opening of an outlet opening in the distribution device, a fan for cleaning of the filter bags in the chamber which is closed for supply of uncleaned gas and for simultaneously transport by suction of particles via the outlet opening in the distribution device and to a silo for collected particles.
• the distribution device comprises a chamber having a circular cross-section.
• the lower part of the distribution device is preferably of conical shape with the openings connected to each of the bottom hoppers arranged about the periphery of the conical part of the distribution device and where the outlet opening is arranged in the bottom of the distribution device.
• the fan is preferably arranged after a silo filter, cyclone or the like, but can also be placed between the outlet opening of the distribution device and the silo filter.
• the device for closing of supply of uncleaned gas to one and one of the openings in the distribution device connected to the bottom hoppers preferably comprises a sheet arranged inside the distribution device which sheet is rotatably arranged on a vertical axle which extends down below the bottom of the distribution device.
• the sheet has such a shape and size that it closes the supply of uncleaned gas to one of the chambers at the same time as it forms an open channel from the bottom hopper of this chamber through the outlet opening in the distribution device.
• the axle to which the sheet is connected can be rotated by means of a motor or the like.
• the sheet can thereby by rotation of the axle be moved from one opening to the next opening in the sidewall of the distribution device whereby one and one chambers is closed for supply of uncleaned gas at the same time as the chamber which is closed for supply of uncleaned gas is opened towards the outlet opening of the distribution device.
• the chamber which is closed for supply of uncleaned gas will thus be cleaned for particles retained on the filter bag as the fan will suck clean gas through the bags whereby retained particles will fall downwardly into the bottom hopper below the chamber whereafter the particles are transported through the outlet opening of the distributor device and to the silo for storage of the particles.
• both the cleaning of the filter bags and the transport of retained particles are controlled by rotation of the device for closing one and one of the openings in the distribution device for supply of uncleaned gas.
• the chambers of the bag house filter are in the form of adjacently arranged segments with the distribution device arranged in the center of the bag house filter and where each of the bottom hoppers are directly connected to the openings in the distribution device in order to supply uncleaned gas to the chambers. This arrangement gives a very compact filter which does not require much space and which will be easy to maintain. Further, the filter can be divided into a lot of chambers which give less load on the remaining chambers when one of the chambers is being cleaned.
• the present invention recirculation of collected particles during cleaning of the filter bags is avoided. In this way the load on the filter is reduced. Further, the bottom hoppers can be smaller than conventional hoppers due to the fact that the transport of the collected particles from the bottom hoppers is done with relatively high amount of gas.
• the device according to the present invention can be implemented on existing bag house filters by incorporating the distribution device and by connecting the outlet openings of the bottom hoppers in each chamber to the distribution device.
• Figure 1 shows a bag house filter according to the invention seen from above.
• Figure 2 shows a vertical cut through the filter along line I - 1 in Figure 1
• Figure 3 shows a filter according to the invention incorporated into a conventional filter seen from above, and where,
• Figure 4 shows a vertical cut along line II - II in Figure 3.
• FIGS 1 and 2 there are shown a bag house filter comprising a plurality of chambers 1 where each chamber contains a plurality of filter bags 2.
• the filter chambers 1 are of conventional design.
• Each of the chambers comprises a bottom hopper 3, which preferably have conical form.
• a distribution device 4 for distribution of uncleaned gas to the chambers 1 and for transport of collected particles.
• the distribution device 4 has an inlet opening 5 at its upper end for supply of uncleaned gas.
• openings 6 which via pipes 7 are connected to the bottom hoppers 3 in the chambers 1.
• the distribution device 4 has at its lower end an outlet opening 8 which via a pipe 9 is connected to a silo 10 for storage of particles removed from the gas. Further it is, in connection with the pipe 9 arranged a fan 11. Upstreams of the fan 11 there is arranged a silo filter or a cyclone 12.
• the inlet opening 5 can be at the lower end of the distribution device and the outlet opening 8 can be at the upper end of the distribution device.
• a rotatabie closing- and opening device 13 for closing of one at a time of the openings 6 for supply of uncleaned gas to the chambers 1.
• the device 13 comprises a sheet 14 for closing of one at a time of the openings 6 for supply of uncleaned gas to the chamber 1.
• the sheet 14 is intended to be rotated about an axle 15 by means of a motor or the like 16.
• the sheet 14 has such a design that when the device 13 is brought to a position where the sheet 14 closes one of the outlet openings 6, this outlet opening 6 will communicate with the outlet opening 8 in the bottom of the distribution device 4.
• the device 13 is in such a position that the inlet opening 5 of the distribution device 4 communicate with all of the openings 6 but one. Uncleaned gas will thereby be supplied to all of the chambers 1 except one. Uncleaned gas will thereby flow to the chambers 1 and through the filter bags 2. Solid particles contained in the gas will be retained on the inside of the filter bags.
• the device 13 is rotated to a position where the sheet 14 closes the opening 6 for supply of uncleaned gas to the chamber 1 to be cleaned.
• the fan 11 in the pipe 9 which connects the outlet opening 8 in the bottom of the distribution device with the silo 10, will thereby create a reduced pressure in the chamber 1 which is closed for supply of uncleaned gas.
• This reduced pressure will cause particles retained on the surface of the filter bags to fall down into the bottom hopper 3 and the particles will immediately be transported to the silo.
• the device 13 is rotated to such a position that uncleaned gas again is supplied to the chamber 1 which has been cleaned, while the opening 6 for the next chamber 1 is closed for uncleaned gas and is opened for cleaning of the filter bags and the transportation of particles. This sequency is repeated at preset intervals.
• FIGS 3 and 4 there is shown a bag house filter having a rectangular shape.
• the filter is divided into a plurality of chambers 50.
• a funnel shaped hopper 51 which by means of inner partition walls 52 is divided into one bottom hopper 53 for each chamber 50.
• Centrally arranged in the bottom of the funnel shaped hopper 51 there is arranged a distribution device 54 of the same kind as described above in connection with Figures 1 and 2.
• the distribution device 54 has a gas inlet opening 55 for uncleaned gas in its upper part and in its lower conical part the distribution device 54 is equipped with openings 56 which each communicate directly with one of the bottom hoppers 53.
• a rotatably closing- and opening device 57 for successive closing and opening of one and one of the openings 56 for supply of uncleaned gas to the chambers 1.
• the device 57 is of the same kind as the device 13 described above in connection with the embodiment shown in Figures 1 and 2.
• the distribution device 54 operates in the same way as described above in connection with Figures 1 and 2.

Landscapes

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

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19899320

Family Applications (1)

Country Status (7)

Cited By (4)

Families Citing this family (2)

Citations (3)

Family Cites Families (5)

• 1996
  • 1996-04-29 NO NO961735A patent/NO302018B1/no not_active IP Right Cessation
• 1997
  • 1997-04-03 CN CN97194178A patent/CN1076209C/zh not_active Expired - Lifetime
  • 1997-04-03 RU RU98121502/12A patent/RU2155630C2/ru active
  • 1997-04-03 WO PCT/NO1997/000089 patent/WO1997040916A1/en active IP Right Grant
  • 1997-04-03 CZ CZ19983453A patent/CZ289149B6/cs not_active IP Right Cessation
  • 1997-04-03 BR BR9708876A patent/BR9708876A/pt not_active Application Discontinuation
  • 1997-04-11 ZA ZA973118A patent/ZA973118B/xx unknown

Patent Citations (3)

Also Published As

Similar Documents

Legal Events