EP0020766B1 - Exhaust gas cleaning system for diesel engines - Google Patents

Exhaust gas cleaning system for diesel engines Download PDF

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Publication number
EP0020766B1
EP0020766B1 EP79900882A EP79900882A EP0020766B1 EP 0020766 B1 EP0020766 B1 EP 0020766B1 EP 79900882 A EP79900882 A EP 79900882A EP 79900882 A EP79900882 A EP 79900882A EP 0020766 B1 EP0020766 B1 EP 0020766B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
heat
resistant filter
gas cleaning
burner
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
EP79900882A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0020766A4 (en
EP0020766A1 (en
Inventor
Yoshinobu Suzuki
Kiyoshi Chiba
Tomoya Tokuhiro
Yoshiyuki Iwasawa
Yasuo Kajioka
Tomio Komine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimizu Construction Co Ltd
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/ja
Priority claimed from JP3580179A external-priority patent/JPS55128612A/ja
Application filed by Shimizu Construction Co Ltd filed Critical Shimizu Construction Co Ltd
Publication of EP0020766A4 publication Critical patent/EP0020766A4/en
Publication of EP0020766A1 publication Critical patent/EP0020766A1/en
Application granted granted Critical
Publication of EP0020766B1 publication Critical patent/EP0020766B1/en
Expired legal-status Critical Current

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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

Definitions

  • the present invention relates to an exhaust gas cleaning system for diesel engines comprising: an exhaust gas cleaning passage into which the exhaust gas emitted from a diesel engine is introduced; at least one heat-resistant filter disposed at an upstream side portion of said exhaust gas cleaning passage and adapted to catch and remove the smoke particles suspended by said exhaust gas; a catalyst convertor disposed at a downstream side portion of said exhaust gas cleaning passage and adapted to remove bad smell and noxious components of said exhaust gas; and a regenerating burner associated with said heat-resistant filter, said regenerating burner being adapted to burn and remove the smoke particles which have been caught by said heat-resistant filter.
  • US-A-2 946 651 teaches to maintain a catalytic bed hot in its centre, by periodically reversing, by means of a change-over valve, the direction of flow of a gas stream, said catalytic bed performing the function both of a heat exchanger and of a heat generator. Therefore, this reference teaches to reverse the direction of a gas stream through filters and catalysts.
  • the object of the present invention is to improve a cleaning system of the above mentioned type, so that the burning and removal of the smoke particles caught by the heat-resistant filter can be effected even during the flowing of the exhaust gas through the system.
  • the present invention relates to an exhaust gas cleaning system for diesel engines comprising: an exhaust gas cleaning passage into which the exhaust gas emitted from a diesel engine is introduced; at least one heat-resistant filter disposed at an upstream side portion of said exhaust gas cleaning passage and adapted to catch and remove the smoke particles suspended by said exhaust gas; a catalyst convertor disposed at a downstream side portion of said exhaust gas cleaning passage and adapted to remove bad smell and noxious components of said exhaust gas; and a regenerating burner associated with said heat-resistant filter, said regenerating burner being adapted to burn and remove the smoke particles which have been caught by said heat-resistant filter, characterized in that said exhaust gas cleaning passage is branched into a plurality of branch passages each of which having one heat-resistant filter, said system further comprising a change-over switch disposed at the juncture of said plurality of branch passages and adapted to pass said exhaust gas to selected one of said plurality of branch passages.
  • the present invention also relates to an exhaust gas cleaning device for diesel engines comprising an exhaust gas cleaning passage into which the exhaust gas emitted from a diesel engine is introduced, a heat-resistant filter disposed in said exhaust gas cleaning passage and adapted to catch and remove the smoke particles, a catalyst bed disposed at the downstream side of said heat-resistant filter, a regenerating burner associated with said heat-resistant filter and adapted to burn and remove the smoke particles which have been caught by said heat-resistant filter, said heat-resistant filter and said catalyst bed being contained in a single case, and said regenerating burner being operable even during the emission of said exhaust gas.
  • the object of the present invention is thus to improve a cleaning system of this type, so that a maximum filtering and catalyting activity is permitted in minimum space.
  • the instant invention relates to a system of this last-mentioned type, characterized in that said heat-resistant filter and said catalyst bed contained by said case have, each, a hollow cylindrical form and are laminated with each other, and said exhaust gas flowing through the cylindrical peripheral surface of said hollow cylindrical formed heat-resistant filter.
  • a reference numeral 1 denotes a diesel engine having an exhaust gas cleaning system of the invention.
  • a reference numeral 2 denotes a starting end of an exhaust gas cleaning passage, to which connected are two shunt passages 3, 4.
  • a change-over valve 5 is disposed at the point where the shunt passages 3 and 4 merge in each other, so that the flow of the exhaust gas is switchable between the passage 3 and the passage 4 depending on the state of the change-over valve 5.
  • Reference numerals 6 and 7 denote, respectively, heat-resistant filters disposed in the shunting passages 3 and 4, respectively.
  • the heat-resistant filters 6 and 7 are made of metal fibers of several different fiber diameters . selected in accordance with the particle-size distribution of the smoke.
  • the metal fibers of different fiber diameters are shaped into layers which are superposed or laminated to present a generally cylindrical or disc-like form as a whole.
  • Passages 3a, 3b and passages 4a, 4b branch from the passages 3 and 4, respectively.
  • the passages 3a and 4a lead to an exhaust pipe 8, while the passages 3b and 4b are communicated with a catalyst convertor 9 the outlet side of which is in communication with the exhaust pipe 8.
  • Reference numerals 10 and 11 denote change-over valves disposed in the branch pipes 3a, 3b and the branch pipes 4a, 4b, respectively.
  • the arrangement is such that, as the change-over valves 10 and 11 are operated, the state of communication is switchable between a first mode in which the branching pipes directly communicate with the exhaust pipe 8 and a second mode in which these branch pipes 3, 4 are communicated with the catalyst convertor 9.
  • Reference numerals 12 and 13 denote regenerating passages extended between the branch passages 3 and 4. These regenerating passages 12 and 13 are connected to the inlet sides of the heat-resistant filters 6 and 7. Further, a change-over valve 15 is disposed at the blow-in port 14 of the regenerating passages 12, 13 so as to be confronted by a burner 16. The arrangement is such that the smoke particles with which the heat-resistant filters 6, 7 are clogged are burnt and removed as hot air is introduced into the filters 6 and 7 by means of the blower 17.
  • the regenerating device for regenerating the heat-resistant filters 6 and 7 are thus constructed. Since the exhaust gas emitted from the diesel engine contains only a small amount of oxygen, it is extremely difficult to burn the smoke particles. A blower 17 is therefore provided for supplying external air to assist the complete burning of the smoke particles.
  • Reference numerals 18 and 19 denote pressure differential gauges attached across respective heat-resistant filters 6 and 7. More specifically, the pressure differential gauge 18 is communicated with the outlet and inlet sides of the heat-resistant filter 6, while the pressure differential gauge 19 is communicated with the outlet and inlet sides of the heat-resistant filter 7. These pressure differential gauges are adapted to inform of the pressure differential or pressure drop across respective heat-resistant filters 6, 7, i.e. the state of clogging of these filters with the smoke particles.
  • an automatic control is adopted to automatically reverse or inverse the change-over valves 5, 10, 11 15 to switch the passage of the exhaust gas and to automatically start the burner 16 and the blower 17 thereby to feed hot air into the heat-resistant filters 6, 7 to burn and remove the smoke particles attaching to these filters.
  • This automatic control is made in accordance with the state of clogging of the heat-resistant filters 6, 7 sensed by the pressure-differential gauges 18 and 19.
  • the exhaust gas emitted from the diesel engine 1 is made to flow into the branch passage 3 through the starting end 2 of the exhaust cleaning passage and then flows through the heat-resistant filter 6 to reach the catalyst convertor 9 via the branch passage 3b.
  • the exhaust gas is finally relieved to the atmosphere through the exhaust pipe 8.
  • the noxious components such as carbon monoxide and hydrocarbon of the exhaust gas and the bad smell are decomposed into harmless carbon dioxide and water due to the catalytic oxidation action of the catalyst filling the catalyst convertor 9.
  • the undesirable attaching of the smoke particles to the catalyst convertor 9 is fairly avoided because the smoke particles have been already caught and removed by the heat-resistant filter 6, so that the -.atalytic action of the catalyst is maintained for longer period of time without deterioration.
  • the attaching or deposition of the smoke particles to the heat-resistant filter 6 results in an increase of the pressure loss across the heat-resistant filter 6.
  • This increase is conveniently detected by the pressure differential gauge 18 which in turn acts to cause an automatic inversion of the change-over valves 5, 10, 11, 15 to switch the passage to make the exhaust gas flow through the branch passage 4 and, hence, the heat-resistant filter 7, thereby to permit a continuous cleaning.
  • the burner 16 and the blower 17 are automatically started to supply the hot air to the heat-resistant filter 6 which has been clogged with the smoke particles, thereby to completely burn the smoke particles which have been caught by the heat-resistant filter 6 to regenerate the latter in a comparatively short period of time.
  • the gases generated during the regeneration of the heat-resistant filter are discharged directly through the exhaust pipe 8, via the branch passage 3.
  • the heat-resistant filters are arranged in two parallel lines, to permit a switching such that one line operates while the other line is being regenerated.
  • This arrangement is not exclusive and it is possible to make the exhaust gas cleaning system small-sized and compact by using only one line of the heat-resistant filter and arranging such that the exhaust gas is allowed to flow through the sole heat-resistant filter even during the regeneration of the latter.
  • a reference numeral 21 denotes a cylindrical hollow case disposed in the exhaust system of a diesel engine.
  • An inlet 22 for the exhaust gas is formed in the peripheral wall of the case 21 at a portion close to one axial end of the latter, while an outlet 23 for the exhaust gas is formed near the other axial end of the case 21.
  • the case 21 accommodates a heat-resistant filter 24 which is constituted by metallic fibers or the like material shaped into the form of a mat or sheet and wound in a spiral manner into a hollow cylindrical form.
  • this heat-resistant filter 24 of the second embodiment is composed of metal fibers of different fiber diameters suitably selected in accordance with the particle-size distribution of the smoke particles.
  • the axial end portion of the heat-resistant filter 24 closer to the inlet 22 is closed by a cover 25 while the end of the same closer to the outlet 23 is left opened and communicated with the outlet 23.
  • a reference numeral 26 denotes a catalyst bed disposed in the case 21.
  • This catalyst bed 26 is constituted by sponge-shaped metal catalyst wound spirally into a hollow cylindrical form.
  • the metal catalyst is typically platinum or the like material capable of removing the bad smell and noxious components of the exhaust gas, e.g. carbon monoxide and hydrocarbon.
  • the catalyst bed 26 is disposed in the hollow cylindrical heat-resistant filter 24, i.e. at the downstream side of the same, and underlies the heat-resistant filter 24.
  • a reference numeral 27 denotes a partition plate which is disposed near the outlet 23 of the case 21 and is adapted to separate the inlet 22 and the outlet 23 of the case 21 from each other. Therefore, the exhaust gas coming into the case 21 through the inlet 22 is allowed to reach the outlet 23 only through the cylindrical peripheral surfaces of the heat-resistant filter 24 and the catalyst bed 26.
  • a high pressure burner is attached to one axial end of the case 21 closer to the inlet 22 in an airtight manner.
  • This high pressure burner 28 is adapted to be actuated in accordance with the pressure differential across the laminated layers of the heat-resistant filter 24 and the catalyst bed 26 or the pressure differential between the inlet 22 and outlet 23 of the case 23, i.e the state of clogging of the heat-resistant filter 24 which is sensed by a pressure-differential gauge (not shown). Thanks to the high withstandable pressure, this high pressure burner 28 can operate even during running of the diesel engine, i.e. during flowing of the exhaust gas through the heat-resistant filter 23. Thus, the burner 28 can supply the hot air to the heat-resistant filter 24 even under the presence of the flow of exhaust gas to regenerate the heat-resistant filter 24.
  • a reference numeral 29 denotes an intake port for high pressure combustion air, provided in the high pressure burner 28.
  • the high pressure burner 28 is provided with necessary means for coping with the fluctuation of the pressure of the exhaust gas introduced into the case 21.
  • a reference numeral 30 denotes a cylindrical heat radiating plate attached to the high pressure burner 28 and adapted to surround the flame formed around the high pressure burner 28.
  • a multiplicity of apertures 30a, 30a ... are formed in the peripheral wall of the heat radiating plate near the free end of the same.
  • Reference numerals 31 and 32 denote, respectively, a heat insulating material attached to the case 21 and a fixation for mounting the case 21.
  • Figs. 4 and 5 show another form of this second embodiment.
  • the device for regenerating the heat-resistant filter 24 is constituted by the high pressure burner 28.
  • the high pressure burner 28 is substituted by a combination of an ordinary low pressure burner and a vacuum generating section formed in the exhaust gas discharge passage.
  • this low pressure burner and the vacuum generating section constitute the device for regenerating the heat-resistant filter 24.
  • the vacuum generating section formed in the exhaust passage 34 upstream from the case 21 is designated at a reference numeral 33. This vacuum generating section can be formed by locally reducing the diameter of the exhaust passage 34 as shown in Fig.
  • the low pressure burner 35 is disposed to confront to a conduit 34 which opens to the vacuum generating section 33, so that the hot air produced by the low pressure burner 35 is induced into the case 21 due to the vacuum which is generated as the exhaust gas flows through the vacuum generating section 33.
  • the exhaust gas cleaning system having the described construction operates in a manner illustrated hereinafter. Assuming here that the diesel engine is operating, the exhaust gas emitted from the diesel engine is introduced into the case 21 through the inlet 22 of the latter, and flows through the walls of the heat-resistant filter 24 and the catalyst bed 26. Finally, the exhaust gas is discharged through the outlet 23. The smoke particles suspended by the exhaust gas are caught without fail by the heat-resistant filter 24 as the exhaust gas flows through the latter. Also, the bad smell and noxious components such as carbon monoxide and hydrocarbon are efficiently removed by the catalytic action of the catalyst bed 26 as the latter is passed by the exhaust gas.
  • the pressure differential between the inlet 22 of the case 21 and the outlet 23 of the same is increased correspondingly.
  • This increase of the pressure differential is detected by the pressure-differential gauge (not shown).
  • the presure-differential gauge acts to start the high pressure burner.
  • hot air is introduced into the case 21 so that the smoke particles which have been caught by the heat-resistant filter 24 are completely burnt and removed to regenerate the heat-resistant filter 24.
  • This in turn causes a reduction of the pressure-differential in the case 21, upon detect of which high pressure burner 28 is stopped.
  • the heat radiating plate 30 is red- heated as a result of operation of the high pressure burner 28.
  • the exhaust gas introduced through the inlet 22 is blown against the peripheral surface of the end portion of the heat radiating plate 30 and is heated by the latter as it flows spirally around the cylindrical peripheral surface of the heat radiating plate 30. This heated air then flows through the heat-resistant filter 24 to completely bum and remove the smoke particles.
  • the pressure differential gauge (not shown) detects the clogging to actuate the low pressure burner 35.
  • the hot air produced by the low pressure burner 35 is introduced into the case 21 due to the vacuum generated by the vacuum generating section 33, thereby to completely burn and remove the smoke particles which have been caught by the heat-resistant filter 24.
  • the present invention provides a small-sized system for cleaning the exhaust gas emitted from a diesel engine, which has a high cleaning performance and which is easy to maintain, applicable to various diesel engines such as those mounted on construction equipments and ordinary vehicles such as diesel buses and trucks, as well as to the diesel engines installed in buildings.

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  • 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)
EP79900882A 1978-07-27 1980-03-11 Exhaust gas cleaning system for diesel engines Expired EP0020766B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP9213278A JPS5519934A (en) 1978-07-27 1978-07-27 Exhaust purifying system in diesel engine
JP92132/78 1978-07-27
JP3580179A JPS55128612A (en) 1979-03-26 1979-03-26 Exhaust gas purifying apparatus for diesel engine
JP35801/79 1979-03-26

Publications (3)

Publication Number Publication Date
EP0020766A4 EP0020766A4 (en) 1980-09-29
EP0020766A1 EP0020766A1 (en) 1981-01-07
EP0020766B1 true EP0020766B1 (en) 1983-03-02

Family

ID=26374798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79900882A Expired EP0020766B1 (en) 1978-07-27 1980-03-11 Exhaust gas cleaning system for diesel engines

Country Status (5)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3725587A1 (de) * 1987-08-01 1989-02-09 Leistritz Ag Vorrichtung zur reinigung von teilchenfiltern, insbesondere russfiltern von dieselmotoren
DE3729126A1 (de) * 1987-09-01 1989-04-06 Mototech Motoren Umweltschutz Dieselruss-partikelfilter und verfahren zu seiner herstellung
DE19737824B4 (de) * 1996-08-29 2005-09-01 Matsushita Electric Industrial Co., Ltd., Kadoma Reiniger zum Entfernen von Partilkeln und Reinigungsverfahren dazu
CN110652778A (zh) * 2019-10-25 2020-01-07 邳州亚联环保科技有限公司 环保设备用并联过滤器

Families Citing this family (29)

* 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 (de) * 1981-05-29 1982-12-16 Robert Bosch Gmbh, 7000 Stuttgart "vorrichtung zum reinigen eines filters fuer eine auspuffanlage einer waermekraftmaschine"
US4462812A (en) * 1982-12-08 1984-07-31 General Motors Corporation Ceramic monolith particulate trap including filter support
EP0114696B1 (en) * 1983-01-24 1988-12-28 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 (sv) * 1984-01-10 1985-07-08 Unikat Ab Partikelfilter, for rening av avgaser fran forbrenningsmotor, kompletterat med katalysatorer
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
EP0216729B1 (de) * 1985-08-16 1990-10-24 Alusuisse-Lonza Services Ag Filterkerze zur Reinigung der Abgase von Dieselmotoren
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GB2040182B (en) 1983-01-12
DE2953010C2 (es) 1992-10-15
EP0020766A4 (en) 1980-09-29
SE441027B (sv) 1985-09-02
EP0020766A1 (en) 1981-01-07
WO1980000362A1 (en) 1980-03-06
DE2953010T1 (de) 1981-04-09
GB2040182A (en) 1980-08-28
SE8001507L (sv) 1980-02-27

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