SE8001507L - DIESEL ENGINE EXHAUST CLEANING DEVICE - Google Patents

DIESEL ENGINE EXHAUST CLEANING DEVICE

Info

Publication number
SE8001507L
SE8001507L SE8001507A SE8001507A SE8001507L SE 8001507 L SE8001507 L SE 8001507L SE 8001507 A SE8001507 A SE 8001507A SE 8001507 A SE8001507 A SE 8001507A SE 8001507 L SE8001507 L SE 8001507L
Authority
SE
Sweden
Prior art keywords
filters
catalytic layer
heat resisting
filter
diesel engine
Prior art date
Application number
SE8001507A
Other languages
Swedish (sv)
Other versions
SE441027B (en
Inventor
Y Suzuki
K Chiba
T Tokuhiro
Y Iwasawa
Y Kajioka
T Komine
Original Assignee
Shimizu Construction Co Ltd
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
Priority claimed from JP9213278A external-priority patent/JPS5519934A/en
Priority claimed from JP3580179A external-priority patent/JPS55128612A/en
Application filed by Shimizu Construction Co Ltd filed Critical Shimizu Construction Co Ltd
Publication of SE8001507L publication Critical patent/SE8001507L/en
Publication of SE441027B publication Critical patent/SE441027B/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/031—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters having means for by-passing filters, e.g. when clogged or during cold engine start
    • F01N3/032—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters having means for by-passing filters, e.g. when clogged or during cold engine start during filter regeneration only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/0217—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters the filtering elements having the form of hollow cylindrical bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/04—Combinations of different methods of purification afterburning and catalytic conversion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/06—Combinations of different methods of purification afterburning and filtering

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

This device for purifying the exhaust gas of a diesel engine incorporates heat resisting filters (6, 7) provided at the upstream side of a catalytic layer (9) to completely remove black smoke particles in the exhaust gas by means of the filtering operation of the filters (6, 7) to thereby prevent the adverse effect caused by the particles adhered onto the catalytic layer (9). The heat resisting filters (6, 7) can be easily recovered by burning and removing the adhered black smoke particles. Further, this device also incorporates a heat resisting filter (24) and a catalytic layer (26) formed in hollow cylindrical shape and laminated together. A high pressure burner (28) or a negative pressure generator (33) are provided for blowing hot gas into the filter (24) when recovering the filters. The heat resisting filter (24) and the catalytic layer (26) are contained within a case (21) in a compact manner.
SE8001507A 1978-07-27 1980-02-27 DEVICE FOR MECHANICAL AND CATALYTICAL CLEANING OF DIESEL ENGINE EXHAUSTS SE441027B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9213278A JPS5519934A (en) 1978-07-27 1978-07-27 Exhaust purifying system in diesel engine
JP3580179A JPS55128612A (en) 1979-03-26 1979-03-26 Exhaust gas purifying apparatus for diesel engine

Publications (2)

Publication Number Publication Date
SE8001507L true SE8001507L (en) 1980-02-27
SE441027B SE441027B (en) 1985-09-02

Family

ID=26374798

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8001507A SE441027B (en) 1978-07-27 1980-02-27 DEVICE FOR MECHANICAL AND CATALYTICAL CLEANING OF DIESEL ENGINE EXHAUSTS

Country Status (5)

Country Link
EP (1) EP0020766B1 (en)
DE (1) DE2953010T1 (en)
GB (1) GB2040182B (en)
SE (1) SE441027B (en)
WO (1) WO1980000362A1 (en)

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2084898B (en) * 1980-10-06 1984-05-16 Texaco Development Corp Periodic rejuvenation of a catalyst filter
DE3121274A1 (en) * 1981-05-29 1982-12-16 Robert Bosch Gmbh, 7000 Stuttgart Device for cleaning a filter for an exhaust system of a heat engine
US4462812A (en) * 1982-12-08 1984-07-31 General Motors Corporation Ceramic monolith particulate trap including filter support
DE3475814D1 (en) * 1983-01-24 1989-02-02 Hitachi Ltd A method and a device for exhaust emission control for diesel engines
CA1230290A (en) * 1983-02-03 1987-12-15 Wallace R. Wade Filtration system for diesel engine exhaust - ii
US4494375A (en) * 1983-02-03 1985-01-22 Ford Motor Company Filtration system for diesel engine exhaust-I
SE439949B (en) * 1984-01-10 1985-07-08 Unikat Ab PARTICLE FILTER, FOR CLEANING ENGINE EXHAUST GAS, COMPLETED WITH CATALYSTS
GB2161396A (en) * 1984-07-09 1986-01-15 Robert Hammond Exhaust gas filter system
GB2161397A (en) * 1984-07-11 1986-01-15 Michael George Berry Exhaust catalytic combustor
DE3675133D1 (en) * 1985-08-16 1990-11-29 Alusuisse Lonza Services Ag FILTER CANDLE FOR PURIFYING THE EXHAUST GAS FROM DIESEL ENGINES.
DE3538105A1 (en) * 1985-10-26 1987-04-30 Man Technologie Gmbh FILTER FOR THE EXHAUST FLOW OF AN INTERNAL COMBUSTION ENGINE
DE3609848A1 (en) * 1986-03-22 1987-10-01 Daimler Benz Ag Exhaust system on an air-compressing internal combustion engine
DE3717140A1 (en) * 1987-05-21 1988-12-08 Webasto Ag Fahrzeugtechnik Soot filter system in the exhaust tract of a diesel internal combustion engine
DE3721725A1 (en) * 1987-07-01 1989-01-12 Wilhelm Doerenkaemper Facility for cleaning flue gases in heating systems
DE3725587A1 (en) * 1987-08-01 1989-02-09 Leistritz Ag Diesel engine exhaust soot filter - with one unit in filter action and the other being cleaned by burn-up of the soot
DE3729126A1 (en) * 1987-09-01 1989-04-06 Mototech Motoren Umweltschutz Diesel soot-particle filter and process for the production thereof
DE3806219C2 (en) * 1988-02-26 1997-12-11 Pattas Konstantin N Soot filter system
DE3839430C1 (en) * 1988-11-23 1989-06-22 Fa. J. Eberspaecher, 7300 Esslingen, De
JPH02196120A (en) * 1989-01-24 1990-08-02 Nissan Motor Co Ltd Exhaust particulate processing equipment for internal combustion engine
US4874407A (en) * 1989-02-07 1989-10-17 Lefkowitz Leonard R Regenerable filter
US5052178A (en) * 1989-08-08 1991-10-01 Cummins Engine Company, Inc. Unitary hybrid exhaust system and method for reducing particulate emmissions from internal combustion engines
DE69204061T2 (en) * 1991-04-23 1996-01-04 Donaldson Co Inc EXHAUST FILTER.
DE4243035A1 (en) * 1992-12-18 1994-06-23 Dornier Gmbh Regenerator for diesel engine exhaust gas soot filters
DE4303626C2 (en) * 1993-02-09 2003-05-28 Deutz Ag Method for controlling particle filter systems
DE4431568B4 (en) * 1994-09-05 2004-04-08 Deutz Ag particulate Filter
JP3651134B2 (en) * 1996-08-29 2005-05-25 松下電器産業株式会社 Exhaust gas purification device and exhaust gas filter regeneration method
JP3228232B2 (en) 1998-07-28 2001-11-12 トヨタ自動車株式会社 Exhaust gas purification device for internal combustion engine
JP2000073739A (en) * 1998-09-03 2000-03-07 Isuzu Ceramics Res Inst Co Ltd Exhaust gas treatment equipment
IT1307003B1 (en) * 1999-01-22 2001-10-11 Luigi Pellegrino DEVICE FOR REDUCING ATMOSPHERIC POLLUTION FROM DISCHARGE GAS.
DE10211565A1 (en) * 2002-03-15 2003-10-09 Eberspaecher J Gmbh & Co Exhaust system with particle filter for diesel engines
CN108816044A (en) * 2018-07-12 2018-11-16 庄五 A kind for the treatment of tail gas environmental protection equipment
CN112302773A (en) * 2019-07-29 2021-02-02 天纳克（苏州）排放系统有限公司 Tail gas aftertreatment device
CN110652778A (en) * 2019-10-25 2020-01-07 邳州亚联环保科技有限公司 Parallel filter for environmental protection equipment

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2946651A (en) * 1956-08-09 1960-07-26 Oxy Catalyst Inc Catalytic treatment of gas streams
US3061416A (en) * 1957-11-22 1962-10-30 George P Kazokas Catalytic muffler
DE1198128B (en) * 1961-06-28 1965-08-05 Eberspaecher J Temperature control arrangement for catalytic converters in vehicle exhaust systems
FR1337630A (en) * 1961-10-23 1963-09-13 Berliet Automobiles Method and device for filtering and catalytic purification of exhaust gases containing solid components
FR1415210A (en) * 1963-11-26 1965-10-22 Universal Oil Prod Co Exhaust gas silencer ensuring their catalytic conversion
DE1476627A1 (en) * 1966-06-10 1970-04-09 Veit Dr Ing Theodor Method and device for cleaning gases and sound insulation, in particular for exhaust gases from internal combustion engines
US3485593A (en) * 1967-06-09 1969-12-23 Ethyl Corp Exhaust treating device
US3556735A (en) * 1967-06-23 1971-01-19 Jacobo Epelman Muffler adapted to purify the exhaust gases of internal combustion engines
DE1953304A1 (en) * 1969-10-23 1971-05-06 Antonin Stoklasek Exhaust gas filter for ic engines
JPS5041370Y2 (en) * 1971-02-06 1975-11-25
DE2125710A1 (en) * 1971-05-25 1972-12-14 Berger, Heinz, 3470 Höxter Device for destroying the harmful components of the exhaust gases from internal combustion engines
FR2145340A5 (en) * 1971-07-08 1973-02-16 Hinderks M V
JPS5110298B2 (en) * 1971-12-11 1976-04-02
GB1434115A (en) * 1972-09-08 1976-05-05 Aoi K Catalytic carbon monoxide removal apparatus for internal com bustion engine exhaust gases
JPS5130497Y2 (en) * 1972-09-20 1976-07-31
DE2257968C3 (en) * 1972-11-27 1980-11-13 Degussa Ag, 6000 Frankfurt Device for cleaning exhaust gases from diesel engines
FR2288218A2 (en) * 1974-10-18 1976-05-14 Sans Jean Bernard Vehicle exhaust gas purification system - has air supply to fibrous refractory filter element to burn off soot particles
DE2519609A1 (en) * 1975-05-02 1976-11-11 Daimler Benz Ag IC engine exhaust gas soot removal - achieved by filter in outflow path and controlled soot burning arrangement
US4054418A (en) * 1975-11-10 1977-10-18 E. I. Du Pont De Nemours And Company Catalytic abatement system
DE2655932A1 (en) * 1976-12-10 1978-06-15 Daimler Benz Ag IC engine with turbocharger - has divided exhaust with self cleaning filter in each branch
JPS5412029A (en) * 1977-06-30 1979-01-29 Texaco Development Corp Smoke filter
US4167852A (en) * 1978-01-26 1979-09-18 General Motors Corporation Diesel engine exhaust cleaner and burner

Also Published As

Publication number Publication date
SE441027B (en) 1985-09-02
EP0020766A1 (en) 1981-01-07
EP0020766B1 (en) 1983-03-02
WO1980000362A1 (en) 1980-03-06
DE2953010T1 (en) 1981-04-09
EP0020766A4 (en) 1980-09-29
DE2953010C2 (en) 1992-10-15
GB2040182A (en) 1980-08-28
GB2040182B (en) 1983-01-12

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