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
  • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
  • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated 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
  • B01D46/42—Auxiliary equipment or operation thereof
  • B01D46/48—Removing dust other than cleaning filters, e.g. by using collecting trays
• • 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
  • B01D46/74—Regeneration of the filtering material or filter elements inside the filter by forces created by movement of the filter element
  • B01D46/76—Regeneration of the filtering material or filter elements inside the filter by forces created by movement of the filter element involving vibrations

Definitions

• the invention relates to the post-treatment of soot particles generated by a heat engine in a vehicle exhaust line.
• filters accumulating within them the particles to be eliminated.
• filters contain a filter media, made of ceramic and consisting of channels that accumulate soot. They are cleaned periodically throughout their use, during the rolling of the vehicle, by a so-called regeneration cleaning process, which consists in injecting upstream of the filter, fuel for burning accumulated soot particles.
• the object of the invention is to reduce the weight and the cost, and to improve the reliability of the known particulate filters. It also aims to reduce the fuel consumption and COz emissions of the vehicle, and to increase its emptying intervals.
• the invention proposes a recyclable filter media, which is unbreakable by the vibrations of the vehicle transmitted to the filter and by gravity, without recourse to fuel injection and the combustion of soot. It also proposes a soot storage volume away from the filter medium, and soot compaction means, for their evacuation.
• a particular form of the surface of the filter media for example in “egg box”, makes it easier to unclogging.
• the filter medium is in the form of a flat panel, and according to a second mode, it is preset in the form of a tube.
• the media may be creased.
• the compaction of the soot can be achieved by i'acihn of a movable element, for example a piston, or by the pressure of the exhaust gas.
• FIGS. 1 and 1A respectively represent a perspective view and a section of a filter equipped with a filtering medium in the form of a flat panel and a piston for compacting soot,
• FIGS. 2 and 2A respectively represent a perspective view and a sectional view of a filter variant with a system for compressing soot by gas pressure;
• FIGS. 3 and 3A respectively represent a perspective view and a sectional view of a filter variant with a tabular filter medium
• Figures 4 and 4A illustrate in a non-limiting manner the structure of the filter media.
• the particulate filter 1 comprises, between an exhaust gas inlet pipe 2 and a gas outlet pipe 3, on which it is fixed, for example welded, a filter body 4.
• the body 4 is fixed to the body 5 (visible in Figure 1A) of the vehicle by at least one connecting lug 6 for transmitting to the filter 1 the vibrations from the vehicle during travel.
• the filter body 4 contains, in its upper part, a filter medium 7, which is in the form of a substantially horizontal panel.
• This filter medium 7 is removably attached, for example clipped, to the body 4, which also provides a support function for the filter medium 7.
• the filter medium 7 is made by means of a thickness of possibly pleated material. It separates the body of the filter 4 into two parts: below it, a dirty chamber 8 where the inlet pipe 2 introduces the gases to be filtered, and above it, a clean chamber 9 from which the filtered gases stand out to the outlet pipe 3, after passing through the filter medium 7.
• the particulate filter 1 has the following operating mode: the soot present in the exhaust gas on arrival in the dirty chamber 8 are retained by the filter medium 7 and agglomerate on the underside of the panel. Under the effect of the vehicle vibrations and gravity, the soot is detached from the filter medium 7 and collected in the bottom of the dirty chamber 8. The filter media 7 is thus unclogged.
• the filter body 4 also contains, in its lower part, means for compacting and storing the soot before being discharged.
• a storage volume 10 for example a parallelepiped cassette, which is fixed, for example welded, on the filter body 4.
• the storage volume 10 communicates with the dirty chamber 8 via an opening 11. It can contain an extractable drawer 12 (in the prolongation to the right of the filter body 4 in FIG. 1A) which slides in the manner of a boot. matches, and can be taken out of the storage volume (10) by the right.
• an extractable drawer 12 in the prolongation to the right of the filter body 4 in FIG. 1A
• filter 1 shows the operating mode next: the bottom of the chamber 8 is swept horizontally from left to right by a movable member 13, for example a piston mQ by an electric actuator 14. The soot accumulated in the bottom of the dirty chamber 8 during the rolling of the The vehicle is pushed back into the storage volume 10 through the opening 11. The piston is then returned to the left position.
• a movable member 13 for example a piston mQ by an electric actuator 14.
• the movements of the piston can be repeated at each stop of the vehicle. It is also possible to choose to trigger the movements of the piston differently, for example during restarts of the vehicle, or periodically when driving.
• the soot is compacted at the bottom of the drawer 12.
• the storage volume 10 of its soot is emptied by extracting the removable drawer 12 from the right.
• the filtering medium 7 can be replaced by a new medium.
• Figures 2 and 2A show a second embodiment of the invention. This mode differs from the previous one in that the compaction of soot is achieved by differential pressure of the exhaust gas.
• the particle filter 1 comprises, beneath the dirty chamber 8, a compacting box 15.
• This casing 15 is removably mounted, for example screwed, under the filter body 4. It comprises at its lower part a compression chamber 16, which is separated from the dirty chamber 8 by a rigid compacting filter membrane 17, for example a filtering medium resting on a metal qrHle.
• the housing 15 also has at its upper part a storage volume 10.
• the compression chamber 16 is connected to the outlet pipe 3 of the exhaust gas via a secondary duct 18.
• the conduit 18 opens into the outlet pipe 3 downstream of a main valve 19 mounted on the outlet pipe 3. It is equipped with a secondary valve 20. Depending on the position of the valves, the filter 1 has two modes of operation distinct In “filtration" mode, the main valve 19 is open, and the secondary valve 20 is closed. The exhaust 302 pass through the filter medium 7. the soot is agglomerated and then falls to the bottom of the dirty chamber 8.
• the main valve 19 is closed and the secondary valve 20 is open.
• the exhaust gas then passes through the compacting filter membrane 17, on which the soot is deposited. Due to the pressure difference between the dirty chamber 8 and the compression chamber 16, the soot is compacted on the surface of the membrane 17.
• the housing 15 can be disassembled and emptied.
• Figures 3 and 3A show alternatively a filter medium 7 which has a tabular shape, for example cylindrical.
• This tabular media has at its ends two fixing rings 21 and 22.
• Its diameter is smaller than the section of the body 4 in which it is housed. It is fixed at its periphery by at least two lugs 23 and 24. The exhaust gases can thus trovers the section of the body 4 left free by the ring 21, and they are directed on the outer lateral walls of the filter medium 7.
• the second ring 22 on the right in the figures, is in the form of a flat ring. It is open in its central part to allow the evacuation of filtered exhaust gases from the inside of the tube. Its outer edge matches the shape of the body 4, so as to close the section of the body around the tube. This shutter forces the incoming gases (unfiltered) to pass through the media 7 and prevents any reflux of the filtered gases upstream,
• FIGS. 4 and 4A illustrate a nonlimiting example of the surface of the filtrate medium 7, for example in the form of an "egg box", which facilitates unclogging of the medium 7.
• This form fits perfectly with a medium 7 having a structure pleated as shown in Figure A A.
• the particulate filter 1 sslon the invention has at least one gas filtering medium 7, for filtering exhaust gases and agglomerating the soot on its surface.
• it comprises means of decoupling and storage located away from the medium (7).

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)
• Processes For Solid Components From Exhaust (AREA)
• Filtering Materials (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=42111689

Family Applications (1)

Country Status (7)

Families Citing this family (4)

Family Cites Families (17)

• 2009
  • 2009-12-15 FR FR0958971A patent/FR2953734B1/fr not_active Expired - Fee Related
• 2010
  • 2010-11-10 EP EP10792992A patent/EP2512620A1/de not_active Withdrawn
  • 2010-11-10 RU RU2012129990/05A patent/RU2012129990A/ru not_active Application Discontinuation
  • 2010-11-10 US US13/514,834 patent/US20120247073A1/en not_active Abandoned
  • 2010-11-10 WO PCT/FR2010/052417 patent/WO2011080430A1/fr active Application Filing
  • 2010-11-10 JP JP2012543865A patent/JP2013513760A/ja not_active Withdrawn
  • 2010-11-10 CN CN2010800564822A patent/CN102652032A/zh active Pending

Non-Patent Citations (1)

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