EP0457287B1 - An anti-pollution device for treating the exhaust gases from internal combustion engines and burners in general, functioning also as exhaust silencer - Google Patents
An anti-pollution device for treating the exhaust gases from internal combustion engines and burners in general, functioning also as exhaust silencer Download PDFInfo
- Publication number
- EP0457287B1 EP0457287B1 EP91107823A EP91107823A EP0457287B1 EP 0457287 B1 EP0457287 B1 EP 0457287B1 EP 91107823 A EP91107823 A EP 91107823A EP 91107823 A EP91107823 A EP 91107823A EP 0457287 B1 EP0457287 B1 EP 0457287B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- outer surfaces
- exhaust gases
- gases
- wall structure
- exhaust
- 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 - Lifetime
Links
- 239000007789 gas Substances 0.000 title claims description 29
- 238000002485 combustion reaction Methods 0.000 title claims description 17
- 230000003584 silencer Effects 0.000 title claims description 5
- 239000000463 material Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 6
- 229910010293 ceramic material Inorganic materials 0.000 claims description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 229910052763 palladium Inorganic materials 0.000 claims description 3
- 229910052703 rhodium Inorganic materials 0.000 claims description 3
- 239000010948 rhodium Substances 0.000 claims description 3
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 3
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 229910000510 noble metal Inorganic materials 0.000 claims 1
- 239000013618 particulate matter Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
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
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/12—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels
-
- 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
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/12—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels
- F01N1/125—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels in combination with sound-absorbing materials
-
- 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
-
- 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
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2807—Metal other than sintered metal
-
- 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
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2825—Ceramics
-
- 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
- F01N3/2885—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with exhaust silencers in a single housing
-
- 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
- F01N2230/00—Combination of silencers and other devices
- F01N2230/04—Catalytic converters
Definitions
- the present invention relates to an anti-pollution device for the treatment of exhaust gases from internal combustion engines and burners generally, which also performs the function of a silencer, i.e. a device for incorporation into the pipeline through which fumes generated by the combustion of fuel are exhausted from internal combustion engines or from the combustion chambers of burners, to the end of controlling or eliminating harmful emissions (CO, HC, NOx and particulate matter), and at the same time of reducing exhaust noise levels.
- a silencer i.e. a device for incorporation into the pipeline through which fumes generated by the combustion of fuel are exhausted from internal combustion engines or from the combustion chambers of burners, to the end of controlling or eliminating harmful emissions (CO, HC, NOx and particulate matter), and at the same time of reducing exhaust noise levels.
- an exhaust gas treating device for treating exhaust gases from an internal combustion engine, comprising at least one inlet pipe for receiving said gases and at least one outlet pipe for discharging said gases, a wall structure defining a single spiral duct through which the exhaust gases can flow from the at least one inlet pipe to the at least one outlet pipe, said wall structure comprising two metal walls defining the outer surfaces of the wall structure that are in direct contact with the exhaust gases, said metal walls being supported in spaced relation to each other and a filler of refractory material being disposed within the space between the walls.
- the scope of the refractory material is to absorb heat from the exhaust gases in order to obtain heat conditions favourable to improving the completeness of the combustion of combustible materials contained in the exhaust gases.
- there is a considerable loss of heat within the exterior of the device through said metal walls said loss of heat reducing considerably the efficiency of the device with respect to the completeness of combustion of the combustible materials contained in the exhaust gases.
- the metal walls must be formed from a metal having a high resistance to the thermal and chemical deterioration caused by the contact with the exhaust gases, which increases substantially the cost of the device. It is an object of the present invention to provide an exhaust gas treating device in which the losses of heat towards the exterior of the device are minimized and a high resistance of the wall structure to thermal and chemical deteriorarion caused by the exhaust gases is obtainable at low costs.
- an anti-pollution device for the treatment of exhaust gases from internal combustion engines and burners in general, functioning also as a silencer, comprising at least one inlet pipe for receiving said gases and at least one outlet pipe for discharging said gases, a wall structure including a material possessing a low coefficient of thermal conductivity and defining a single spiral duct through which the exhaust gases can flow from the at least one inlet pipe to the at least one outlet pipe, characterized in that said wall structure has at least outer surfaces formed from said material.
- Said outer surfaces may be coated with catalytic materials such as platinum, palladium or rhodium, able to promote the oxidation or reduction of pollutants in the exhaust gases.
- catalytic materials such as platinum, palladium or rhodium, able to promote the oxidation or reduction of pollutants in the exhaust gases.
- said outer surfaces may be undulated, or embodied with projections of sawtooth profile, so as to trap and thus favour the combustion of such particulate matter.
- the advantages of the present invention are: the facility of utilizing a single device to control emissions in and reduce the noise level of exhaust gases; simplicity in construction; marked reduction in manufacturing costs; greater efficiency.
- 1 denotes a pipe through which exhaust gases are directed into the device
- a and B denote the longitudinal axis of the pipe and of the device, respectively
- 2 denotes a cover fitted to the front end of the device, i.e. the inlet end
- 3 denotes a spiral duct of which the walls 4 are created by the single coils of an element fashioned from metal coated with a material of low thermal conductivity and receding spirally from the axis AB of the device.
- 4' denotes the same spirally coiled walls of an element fashioned in ceramic material such as cordierite.
- FIG. 6 denotes the outermost coil of the spiral element, which provides the external casing of the device in the event that the walls 4 are fashioned in metal with a coating of low thermal conductivity (fig 1); 7 denotes the outer casing of a device in which the walls 4' of the spiral element are ceramic material (fig. 3).
- 10 denotes a central baffle partly enclosing the rear end of the spiral duct 3, which consists in a circular dish pressed from the rear cover 11 of the device; 12 denotes a void between the rear cover 11 and the turns of the duct 3 not enclosed by the battle 10, which may be filled with sound-absorbent or sound-reflecting material.
- the embodiment of fig 3 further comprises a layer of insulating material 14 sandwiched between the outermost coil 6 of the spiral element and the casing 7; also, the surface of each coil or wall 4' affords a plurality of projections 15 exhibiting a sawtooth profile, which serve to trap particulate matter.
- Hot combustion gases generated by fuel combustion in an engine, or a burner generally, characterized by a high content of pollutant emissions and sound pressure waves of high intensity, are directed from the exhaust pipe 1 into the spiral duct 3 by way of the hole 9 in the inlet ring 8.
- the temperature of the walls 4 or 4' is raised to a level such as will promote further combustion of the pollutants present in the gases (CO, HC); further combustion in turn pushes the temperature of the walls 4 or 4' still higher, thereby enhancing the destruction process.
- This further combustion of carbon monoxide and hydrocarbons can be rendered more advantageous yet by coating the walls 4 or 4' with a platinium or palladium based cacalytic material.
- Such a material might also be formulated with rhodium, to the end of catalyzing the reduction of nitrogen oxides.
- the sawtooth projections 15 increase the ability of the device to trap any particulate matter on the surface of the walls 4 or 4', whereupon such matter will burn by reason of the high temperature of the coils.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Ceramic Engineering (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Exhaust Silencers (AREA)
Description
- fig 1 is a longitudinal section through a device according to the invention, in which the spiral element is fashioned in sheet metal with a suitably treated surface;
- fig 2 is the section through II-II, fig 1;
- fig 3 is a longitudinal section through a device according to the invention, in which the spiral element is fashioned in ceramic material;
- fig 4 is the section through IV-IV, fig 3.
Claims (8)
- An anti-pollution device for the treatment of exhaust gases from internal combustion engines and burners in general, functioning also as a silencer, comprising at least one inlet pipe (1) for receiving said gases and at least one outlet pipe (13) for discharging said gases, a wall structure (4, 4') including a material possessing a low coefficient of thermal conductivity and defining a single spiral duct (3) through which the exhaust gases can flow from the at least one inlet pipe (1) to the at least one outlet pipe (13), characterized in that said wall structure (4, 4') has at least outer surfaces formed from said material.
- A device as in claim 1, wherein said wall structure (4, 4') is formed from metal interposed between said outer surfaces.
- A device as in claim 1, wherein between said outer surfaces, said wall structure is formed from the same material forming said at least outer surfaces.
- A device, as in claim 1, or 2, or 3, wherein said at least one inlet pipe (1) is connected to said spiral duct (3) at a location nearer to a central area thereof than the location at which said at least one outlet pipe (13) is connected to the spiral duct (3).
- A device as in one of claims 1 to 4, wherein at least one of said outer surfaces is coated with a catalytic material incorporating noble metals such as platinum, palladium and rhodium.
- A device as in one of the preceding claims, wherein at least one of said outer surfaces exhibits projections (15) having a sawtooth profile.
- A device as in one of claims 1 to 5, wherein at least one of said outer surfaces is undulated.
- A device as in claim 1, wherein the material possessing a low coefficient of thermal conductivity is a ceramic material.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT4008190 | 1990-05-18 | ||
IT04008190A IT1245938B (en) | 1990-05-18 | 1990-05-18 | ANTI-POLLUTION DEVICE FOR EXHAUST GAS OF INTERNAL COMBUSTION ENGINES AND BURNERS IN GENERAL, ALSO HAVING THE FUNCTION OF EXHAUST SILENCER. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0457287A2 EP0457287A2 (en) | 1991-11-21 |
EP0457287A3 EP0457287A3 (en) | 1992-01-02 |
EP0457287B1 true EP0457287B1 (en) | 1998-01-07 |
Family
ID=11247779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91107823A Expired - Lifetime EP0457287B1 (en) | 1990-05-18 | 1991-05-15 | An anti-pollution device for treating the exhaust gases from internal combustion engines and burners in general, functioning also as exhaust silencer |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0457287B1 (en) |
DE (1) | DE69128558T2 (en) |
IT (1) | IT1245938B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0556846A1 (en) * | 1992-02-19 | 1993-08-25 | LEISTRITZ AG & CO. Abgastechnik | Exhaust silencer for diesel engines, particularly for commercial vehicles |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191301332A (en) * | 1913-01-16 | 1913-11-06 | William Edward Lake | Improvements in Silencers for Gas Engines and the like. |
US2552615A (en) * | 1948-05-29 | 1951-05-15 | Lawrence F Baltzer | Muffler with spiral conical insert |
US3066755A (en) * | 1960-04-21 | 1962-12-04 | Diehl William Carl | Muffler with spiral partition |
US3927525A (en) * | 1973-05-25 | 1975-12-23 | Gen Motors Corp | Engine with exhaust manifold converter-reactor |
DE3027499A1 (en) * | 1980-07-19 | 1982-02-18 | Knecht Filterwerke Gmbh, 7000 Stuttgart | EXHAUST GAS FILTER FOR COMBUSTION ENGINES |
DE8912193U1 (en) * | 1989-08-05 | 1989-11-30 | Tomala, Michal, Katowice | Muffler for an exhaust system |
-
1990
- 1990-05-18 IT IT04008190A patent/IT1245938B/en active IP Right Grant
-
1991
- 1991-05-15 DE DE69128558T patent/DE69128558T2/en not_active Expired - Fee Related
- 1991-05-15 EP EP91107823A patent/EP0457287B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0457287A3 (en) | 1992-01-02 |
EP0457287A2 (en) | 1991-11-21 |
IT1245938B (en) | 1994-11-05 |
IT9040081A0 (en) | 1990-05-18 |
IT9040081A1 (en) | 1991-11-18 |
DE69128558T2 (en) | 1998-04-16 |
DE69128558D1 (en) | 1998-02-12 |
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