WO2004003669A2 - Method for testing the integrity of dpf's - Google Patents
Method for testing the integrity of dpf's Download PDFInfo
- Publication number
- WO2004003669A2 WO2004003669A2 PCT/US2003/020073 US0320073W WO2004003669A2 WO 2004003669 A2 WO2004003669 A2 WO 2004003669A2 US 0320073 W US0320073 W US 0320073W WO 2004003669 A2 WO2004003669 A2 WO 2004003669A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- outlet end
- integrity
- air
- filter
- detecting
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
Definitions
- the instant invention relates to filters for the removal of particulate material from diesel engine exhaust, and more particularly to a method of testing the integrity of diesel particulate filters (DPFs) for detecting defects which affect the filtration efficiency.
- DPFs diesel particulate filters
- Wall-flow diesel particulate filters are used in the purification of diesel exhaust.
- diesel particulate filters are made of cordierite (U.S. Pat. No. 4,420,316) or silicon carbide (U.S. Pat. No. 5,914,187), and include a honeycomb body having thin interconnecting interior porous walls which form parallel cell channels of equal hydraulic diameter, longitudinally extending between the end faces of the structure. Alternating cells on one end face of the honeycomb are plugged with a ceramic filler material to form a "checkerboard" pattern. The pattern is reversed on the opposite side, so that the ends of each cell are blocked at only one end of the structure.
- When diesel exhaust enters the filter through one end face i.e., inlet end
- it is forced to pass through the porous walls in order to exit through the opposite end face (i.e., outlet end).
- honeycomb structures having cellular densities between about 10 and 300 cells/in 2 (about 1.5 to 46.5 cells/cm 2 ), more typically between about 100 and 200 cells/in 2 (about 15.5 to 31 cells/cm 2 ), are considered useful to provide sufficient thin wall surface area in a compact structure.
- Wall thickness can vary upwards from the minimum dimension providing structural integrity of about 0.002 in. (about 0.05 mm.), but are generally less than about 0.060 in. (1.5 mm.) to minimize filter volume.
- the present invention overcomes the above problems and drawbacks by providing a more reliable and efficient method for detecting the presence of integrity leakage defects in ceramic filters for trapping and combusting diesel exhaust particulates.
- integrity leakage defects used in the description of the present invention refers to any breaks, tears, holes and the like in the interior walls or at joining sections of the filter body.
- the invention provides a method for testing comprising providing a green plugged honeycomb structure having a plurality of parallel cell channels traversing the structure from an inlet end to an outlet end thereof; passing air under pressure through the inlet end of the honeycomb structure; and, detecting airflow at the outlet end of the honeycomb structure, whereby the presence of the air at the outlet end indicates integrity leakage defects in the ceramic filter.
- green filter as used in the description of the present invention refers to a structure which has not undergone firing. A green filter has no porosity such that the air cannot pass through the internal walls, unless there is an integrity leakage defect thereat.
- the invention is also related to an assembly for testing the integrity of diesel exhaust filters, comprising an enclosure having an aperture; a green plugged filter removably mounted in the aperture of the enclosure; an air blower in communication with the enclosure; and, means for detecting air leakage in the green plugged filter.
- FIG. 1 is a schematic, cross-sectional view of an embodiment of an inventive apparatus for testing the integrity of diesel exhaust particulate filters, the apparatus including a heat sensitive covering secured to the outlet end of a honeycomb filter body;
- FIG. 2 illustrates the movement of air through integrity leakage defects in a honeycomb filter body;
- FIG. 3 is a schematic, cross-sectional view of another embodiment of an inventive apparatus for testing the integrity of diesel exhaust particulate filter, the apparatus including an acoustic sensor for detecting the sound emitted by airflow at the outlet end of a honeycomb filter body.
- FIG. 1 therein depicted is a cross-sectional view of an apparatus 10 including an enclosure 12 connected to air blower 14 at feed pipe 16.
- a suitable air blower 14 is available as Model Number VB-004B-000 (3/4 HP) from Spencer Turbine Company (Hartford, CT).
- Enclosure 12 houses a green filter 30 having a honeycomb structure body 32 composed of a ceramic material and a plurality of parallel end-plugged cell channels 34a, 34b traversing the body 32 from an inlet end 36 to an outlet end 38 thereof.
- Cell channels 34a, 34b are preferably plugged in a checkered pattern such that every other cell channel 34a, 34b has a plug 40 only at one of the inlet end 36 or outlet end 38.
- Green filter 30 is preferably made of a material which upon being subjected to firing in a furnace undergoes transformation to substantially a cordierite phase, as known in the art.
- Green filter 30 is removably mounted in enclosure 12 with inlet end 36 downwardly. Consequently, outlet end 38 of honeycomb body 32 faces upward and out of enclosure 12.
- the present invention is particularly useful for detection of integrity leakage defects for structures having a cell density of 200 cpsi (cells per square inch) and higher.
- a heat sensitive covering 18 is secured over the outlet end 38 with, for example, an adhesive tape.
- a preferred heat sensitive covering, in the practice of the present invention, is a temperature sensitive liquid crystal film available from Edmund Industrial Optics (Barrington, NJ).
- the heat sensitive covering 18 is heated by a heat source 20, preferably a 120W lamp, to a temperature of about 25-30°C. In this way when the air which is at room temperature (i.e., about 22°C) exits the cell channels 34b which are open at outlet end 38 and strikes the heated covering 18, an imprint or mark is formed indicated a temperature change thereat.
- a heat source 20 is adjacent heat sensitive covering 18, at a distance of about 10 in. to 15 in. therefrom, preferably at 13 in.
- Air having a pressure of about 1 to 15 psi (pounds per square inch) passes from air blower 14 through feed pipe 16 to enclosure 12 and into honeycomb filter body 32 through open cell channels 34a at inlet end 36. It has been found that at higher air pressures, smaller leakage defects can be detected. Therefore, preferably the air pressure is maintained at about 10 to 15 psi.
- the air represented by arrows 35 will move through these defects 31 from the cell channels 34a which are open at inlet end 36 into neighboring cell channels 34b which are open at outlet end 38 to exit the honeycomb structure 32 thereat.
- the air strikes the heat sensitive covering 18 leaving a figure of imprints thereat.
- the imprints are a result of a temperature change, i.e., the room temperature air impacting the warm heat sensitive covering.
- the heat sensitive covering 18 is then analyzed to look for these imprints, and determine therefrom the number and location of integrity leakage defects in the structure.
- the size of the imprints can be correlated to the size of the integrity leakage defect. Accordingly, it is envisioned that a size profile may be generated from multiple runs at various air pressures, i.e., the air pressure is varied incrementally and successive sets of imprints are generated. [0021] It is also envisioned that the steps of inspecting the heat sensitive covering and detecting integrity leakage defects will be automated for increased efficiency with an image analyzer as known in the art. Specifically, the image analyzer which generally consists of a television camera or another optical device would be first used to scan the outlet end of the honeycomb structure and generate a first set of signals indicating the location of the cell channels.
- the heat sensitive covering would be scanned to generated a second set of signals indicating the location of any imprints.
- a microprocessor i.e., a personal computer
- a microprocessor is then used to associate the location of the imprints with the location of the corresponding cell channels containing the integrity leakage defects.
- airflow at the outlet end may also be detected with an acoustic sensor which operates to sense the sound emitted by air exiting open cell channels thereat.
- Acoustic sensor 50 is secured to jig means 52 for positioning and operation.
- a suitable acoustic sensor for the purposes of the present invention is AccuTrak VPE-1000, manufactured by Superior Signal Company (Spotswood, NJ).
- acoustic sensor 50 is scanned across the outlet end of the honeycomb structure in the direction of the arrow. A set of signals are recorded and a noise profile is generated on a microprocessor as known in the art. The noise profile is then analyzed to determine the number and location of integrity leakage defects in the structure.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03739309A EP1532430B1 (en) | 2002-06-26 | 2003-06-25 | Method for testing the integrity of dpf's |
DE60310948T DE60310948D1 (en) | 2002-06-26 | 2003-06-25 | PROCEDURE FOR INSPECTION OF THE INTEGRITY OF DPFS |
AU2003245689A AU2003245689A1 (en) | 2002-06-26 | 2003-06-25 | Method for testing the integrity of dpf's |
JP2004517830A JP2005530957A (en) | 2002-06-26 | 2003-06-25 | Inspection method for diesel particulate removal equipment |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/184,316 | 2002-06-26 | ||
US10/184,316 US6666070B1 (en) | 2002-06-26 | 2002-06-26 | Method for testing the integrity of DPFs |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004003669A2 true WO2004003669A2 (en) | 2004-01-08 |
WO2004003669A3 WO2004003669A3 (en) | 2004-04-22 |
Family
ID=29735231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2003/020073 WO2004003669A2 (en) | 2002-06-26 | 2003-06-25 | Method for testing the integrity of dpf's |
Country Status (7)
Country | Link |
---|---|
US (1) | US6666070B1 (en) |
EP (1) | EP1532430B1 (en) |
JP (1) | JP2005530957A (en) |
CN (1) | CN100590405C (en) |
AU (1) | AU2003245689A1 (en) |
DE (1) | DE60310948D1 (en) |
WO (1) | WO2004003669A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009500600A (en) * | 2005-06-29 | 2009-01-08 | サン−ゴバン サントル ドゥ ルシェルシェ エ デトゥードゥ ユーロペン | Non-destructive test method for particle filter and apparatus for carrying out the method |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6964694B2 (en) * | 2002-04-29 | 2005-11-15 | Avl North America Inc. | Diesel particulate filter monitoring using acoustic sensing |
US7410528B2 (en) * | 2004-11-30 | 2008-08-12 | Corning Incorporated | Method and system for testing the integrity of green plugged honeycomb structure |
US7043964B1 (en) * | 2004-12-20 | 2006-05-16 | Corning Incorporated | Method and system for detecting leaks in a plugged honeycomb structure |
WO2006069006A2 (en) * | 2004-12-21 | 2006-06-29 | Corning Incorporated | Method and system for identifying and repairing defective cells in a plugged honeycomb structure |
PL1910802T3 (en) * | 2005-07-29 | 2013-08-30 | Corning Inc | Method and system for detecting defects in a honeycomb body using a particulate fluid |
US7739926B2 (en) | 2005-10-24 | 2010-06-22 | Camfil Farr, Inc. | Method and apparatus for v-bank filter bed scanning |
SG164301A1 (en) * | 2005-10-24 | 2010-09-29 | Camfil Farr Inc | Method and apparatus for v-bank filter bed scanning |
US20070144263A1 (en) * | 2005-12-27 | 2007-06-28 | Caterpillar Inc. | Apparatus for non-destructive evaluation of a workpiece including a uniform contact apparatus |
US20070144260A1 (en) * | 2005-12-27 | 2007-06-28 | Dong Fei | Non-destructive evaluation of particulate filters |
US7412889B2 (en) * | 2006-02-28 | 2008-08-19 | Caterpillar Inc. | System and method for monitoring a filter |
US7395710B2 (en) * | 2006-02-28 | 2008-07-08 | Caterpillar Inc. | System and method for monitoring a filter |
US7674309B2 (en) | 2006-03-31 | 2010-03-09 | Corning Incorporated | Honeycomb filter defect detecting method and apparatus |
US20070251221A1 (en) * | 2006-04-28 | 2007-11-01 | Lueschow Kevin J | System and method for monitoring a filter |
US20070266547A1 (en) * | 2006-05-16 | 2007-11-22 | Zhiqiang Shi | Pulse echo ultrasonic testing method for ceramic honeycomb structures |
US8499633B2 (en) * | 2006-05-16 | 2013-08-06 | Corning Incorporated | Non-contact ultrasonic testing method and device for ceramic honeycomb structures |
US7614304B2 (en) * | 2006-05-16 | 2009-11-10 | Corning Incorporated | Ultrasonic testing system and method for ceramic honeycomb structures |
US20080173071A1 (en) * | 2007-01-22 | 2008-07-24 | Park Timothy A | Honeycomb filter defect detecting method |
DE102008057458B4 (en) * | 2008-11-14 | 2012-04-26 | Sartorius Stedim Biotech Gmbh | Method and device for carrying out integrity tests |
US8234909B2 (en) * | 2009-08-26 | 2012-08-07 | Corning Incorporated | Method and apparatus for inspecting ceramic wall flow filters |
US8875562B2 (en) | 2010-02-17 | 2014-11-04 | Dow Global Technologies Llc | Filter and membrane defect detection system |
EP2622329A1 (en) | 2010-10-01 | 2013-08-07 | Dow Global Technologies LLC | System and method for analyzing pore sizes of substrates |
JP5667415B2 (en) * | 2010-11-11 | 2015-02-12 | 住友化学株式会社 | Honeycomb structure inspection method and honeycomb structure inspection apparatus |
US9074959B2 (en) * | 2012-08-24 | 2015-07-07 | Gm Global Technology Operations, Llc | Method for evaluating the accuracy and repeatability of leak testing instruments |
US9134218B2 (en) | 2012-11-28 | 2015-09-15 | Corning Incorporated | Methods of testing a honeycomb filter |
US9038439B2 (en) | 2012-11-28 | 2015-05-26 | Corning Incorporated | Apparatus and methods for testing a honeycomb filter |
US9523623B2 (en) | 2012-11-28 | 2016-12-20 | Corning Incorporated | Methods for testing a honeycomb filter |
JP6032142B2 (en) * | 2013-07-11 | 2016-11-24 | 株式会社デンソー | Defect inspection method for honeycomb structure |
US11698017B2 (en) | 2018-07-20 | 2023-07-11 | Corning Incorporated | System and method for detecting defects in a honeycomb body |
CN110967151A (en) * | 2018-09-29 | 2020-04-07 | 台山市旺春达环保科技有限公司 | Filter element assembly detection device |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4676092A (en) * | 1985-09-25 | 1987-06-30 | Wainwright Tuttle | Filter test method and apparatus |
US5102434A (en) * | 1990-03-06 | 1992-04-07 | Ngk Insulators, Ltd. | Method of inspecting a honeycomb structural body for purifying exhaust gases and apparatus used in the method |
US5398541A (en) * | 1992-03-23 | 1995-03-21 | Ngk Insulators, Ltd. | Process and an apparatus for determining pressure losses of exhaust gas purification honeycomb structural bodies, by presumption, at respective points of time when honeycomb structural bodies are to be regenerated |
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JPS577215A (en) * | 1980-06-16 | 1982-01-14 | Ngk Insulators Ltd | Preparation of ceramic honeycomb filter |
DE3617724A1 (en) * | 1986-05-27 | 1987-12-03 | Akzo Gmbh | METHOD FOR DETERMINING THE BLOW POINT OR THE BIGGEST PORE OF MEMBRANES OR FILTER MATERIALS |
JPS63185425A (en) * | 1987-01-28 | 1988-08-01 | Ngk Insulators Ltd | Ceramic honeycomb filter for cleaning exhaust gas |
-
2002
- 2002-06-26 US US10/184,316 patent/US6666070B1/en not_active Expired - Fee Related
-
2003
- 2003-06-25 CN CN03818400A patent/CN100590405C/en not_active Expired - Fee Related
- 2003-06-25 JP JP2004517830A patent/JP2005530957A/en not_active Withdrawn
- 2003-06-25 WO PCT/US2003/020073 patent/WO2004003669A2/en active IP Right Grant
- 2003-06-25 AU AU2003245689A patent/AU2003245689A1/en not_active Abandoned
- 2003-06-25 EP EP03739309A patent/EP1532430B1/en not_active Expired - Fee Related
- 2003-06-25 DE DE60310948T patent/DE60310948D1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4676092A (en) * | 1985-09-25 | 1987-06-30 | Wainwright Tuttle | Filter test method and apparatus |
US5102434A (en) * | 1990-03-06 | 1992-04-07 | Ngk Insulators, Ltd. | Method of inspecting a honeycomb structural body for purifying exhaust gases and apparatus used in the method |
US5398541A (en) * | 1992-03-23 | 1995-03-21 | Ngk Insulators, Ltd. | Process and an apparatus for determining pressure losses of exhaust gas purification honeycomb structural bodies, by presumption, at respective points of time when honeycomb structural bodies are to be regenerated |
Non-Patent Citations (1)
Title |
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See also references of EP1532430A2 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009500600A (en) * | 2005-06-29 | 2009-01-08 | サン−ゴバン サントル ドゥ ルシェルシェ エ デトゥードゥ ユーロペン | Non-destructive test method for particle filter and apparatus for carrying out the method |
Also Published As
Publication number | Publication date |
---|---|
EP1532430A2 (en) | 2005-05-25 |
JP2005530957A (en) | 2005-10-13 |
CN1849504A (en) | 2006-10-18 |
US20040000186A1 (en) | 2004-01-01 |
EP1532430B1 (en) | 2007-01-03 |
EP1532430A4 (en) | 2005-11-23 |
DE60310948D1 (en) | 2007-02-15 |
WO2004003669A3 (en) | 2004-04-22 |
AU2003245689A8 (en) | 2004-01-19 |
US6666070B1 (en) | 2003-12-23 |
CN100590405C (en) | 2010-02-17 |
AU2003245689A1 (en) | 2004-01-19 |
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