EP0457287A2 - 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
- EP0457287A2 EP0457287A2 EP91107823A EP91107823A EP0457287A2 EP 0457287 A2 EP0457287 A2 EP 0457287A2 EP 91107823 A EP91107823 A EP 91107823A EP 91107823 A EP91107823 A EP 91107823A EP 0457287 A2 EP0457287 A2 EP 0457287A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- walls
- facing surfaces
- spiral duct
- inward facing
- duct
- 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.)
- Granted
Links
- 239000007789 gas Substances 0.000 title claims abstract description 22
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 18
- 230000003584 silencer Effects 0.000 title claims description 5
- 239000000463 material Substances 0.000 claims abstract description 13
- 230000003197 catalytic effect Effects 0.000 claims abstract description 6
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910010293 ceramic material Inorganic materials 0.000 claims description 4
- 229910052763 palladium Inorganic materials 0.000 claims description 4
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- 229910052703 rhodium Inorganic materials 0.000 claims description 4
- 239000010948 rhodium Substances 0.000 claims description 4
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 4
- 229910000510 noble metal Inorganic materials 0.000 claims 1
- 230000009467 reduction Effects 0.000 abstract description 6
- 239000003344 environmental pollutant Substances 0.000 abstract description 5
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 239000013618 particulate matter Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 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
- 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
- 230000009977 dual effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000006872 improvement Effects 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
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000008569 process Effects 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.
- the prior art embraces devices for the control of exhaust emissions, utilizing catalytic converters in which gases are brought into contact with porous surfaces containing catalytic elements such as platinum, palladium and rhodium, able to promote the oxidation of carbon monoxide and hydrocarbons that have escaped combustion, and the reduction of oxides of nitrogen.
- Such devices have little or no ability to damp sound waves however, and must be used in conjunction with a conventional silencer if lower exhaust noise levels are be achieved.
- the art further embraces exhaust silencer devices as disclosed in US 4579195, IT 1195502, IT 1189816, IT 199088, IT 199262, IT 206501 and IT 207680, in the name of the present applicant, wherein the flow of hot gases is directed entirely or partly into a flat spiral duct or channel of constant or variable pitch, thence into an exhaust chamber connecting with a tail pipe or directly into one or more tail pipes; sound waves carried by the gases are damped principally by collision with the internal surfaces of the spiral duct, and with those of the exhaust chamber or of the inlets to the tail pipes.
- None of the devices reflecting the current state of the art is capable of performing the dual function of controlling emissions in exhaust gases from an internal combustion engine or a burner and damping the sound waves carried in such gases.
- the prior art thus stands in need of improvement, with the end in view of uniting two functions - viz, of eliminating pollutants from the exhaust gases generated by internal combustion engines and by burners, and of damping the sound waves carried by such gases, in a single device.
- the object of the present invention is to provide a device capable of lowering harmful emissions in the exhaust gases produced by internal combustion engines or burners, and of bringing about a notable reduction in exhaust noise levels at one and the same time.
- the stated object is realized in a device through which to direct the flow of exhaust gases from an internal combustion engine or burner, consisting essentially in a duct created between the coils of a flat spiral element open at one or both ends and fashioned in material having a low coefficient of thermal conductivity, such as a ceramic, or sheet metal with a suitably treated surface, for example coated with a layer of aluminium oxide (A1203); advantageously, the surfaces of the spiral element exposed to the gases can 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
- the surface of the spiral coils of material exposed to the hot gases is 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 B 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 (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 platinum or palladium based catalytic 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.
Abstract
Description
- 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.
- The prior art embraces devices for the control of exhaust emissions, utilizing catalytic converters in which gases are brought into contact with porous surfaces containing catalytic elements such as platinum, palladium and rhodium, able to promote the oxidation of carbon monoxide and hydrocarbons that have escaped combustion, and the reduction of oxides of nitrogen. Such devices have little or no ability to damp sound waves however, and must be used in conjunction with a conventional silencer if lower exhaust noise levels are be achieved.
- The art further embraces exhaust silencer devices as disclosed in US 4579195, IT 1195502, IT 1189816, IT 199088, IT 199262, IT 206501 and IT 207680, in the name of the present applicant, wherein the flow of hot gases is directed entirely or partly into a flat spiral duct or channel of constant or variable pitch, thence into an exhaust chamber connecting with a tail pipe or directly into one or more tail pipes; sound waves carried by the gases are damped principally by collision with the internal surfaces of the spiral duct, and with those of the exhaust chamber or of the inlets to the tail pipes.
- None of the devices reflecting the current state of the art is capable of performing the dual function of controlling emissions in exhaust gases from an internal combustion engine or a burner and damping the sound waves carried in such gases.
- The prior art thus stands in need of improvement, with the end in view of uniting two functions - viz, of eliminating pollutants from the exhaust gases generated by internal combustion engines and by burners, and of damping the sound waves carried by such gases, in a single device.
- Accordingly, the object of the present invention is to provide a device capable of lowering harmful emissions in the exhaust gases produced by internal combustion engines or burners, and of bringing about a notable reduction in exhaust noise levels at one and the same time.
- The stated object is realized in a device through which to direct the flow of exhaust gases from an internal combustion engine or burner, consisting essentially in a duct created between the coils of a flat spiral element open at one or both ends and fashioned in material having a low coefficient of thermal conductivity, such as a ceramic, or sheet metal with a suitably treated surface, for example coated with a layer of aluminium oxide (A1203); advantageously, the surfaces of the spiral element exposed to the gases can be coated with catalytic materials such as platinum, palladium or rhodium, able to promote the oxidation or reduction of pollutants in the exhaust gases.
- In the case of exhaust gases containing notable quantities of so-called particulate matter, i.e. the solid combustion residue as produced typically by Diesel engines, the surface of the spiral coils of material exposed to the hot gases is 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.
- Two embodiments of the prosent invention will now be described in detail, by way of example, with the aid of the accompanying drawings, in which:
- 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.
- In the drawings, 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 B of the device. - 4' denotes the same spirally coiled walls of an element fashioned in ceramic material such as cordierite.
- 5 denotes a void between the
front cover 2 and the spirallycoiled walls 4, which may be filled with 10 sound-absorbent or sound-reflecting material. - 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 (fig 3). - 8 denotes a ring enclosing the innermost turns of the spiral duct at the inlet end and affording a
central hole 9 by which these same innermost turns are caused to communicate with theexhaust pipe 1. - 10 denotes a central baffle partly enclosing the rear end of the
spiral duct 3, which consists in a circular dish pressed from therear cover 11 of the device; 12 denotes a void between therear cover 11 and the turns of theduct 3 not enclosed by thebattle 10, which may be filled with sound-absorbent or sound-reflecting material. - 13 denotes a tail pipe associated with the device by insertion through the periphery of the
rear cover 11 in such a way as to communicate with the outermost turns of thespiral duct 3; C denotes the axis of thepipe 13. The embodiment of fig 3 further comprises a layer ofinsulating material 14 sandwiched between theoutermost coil 6 of the spiral element and thecasing 7; also, the surface of each coil or wall 4' affords a plurality ofprojections 15 exhibiting a sawtooth profile, which serve to trap particulate matter. - Operation of the device will now be described.
- 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 thespiral duct 3 by way of thehole 9 in theinlet ring 8. The temperature of thewalls 4 or 4', whether of metal with a coating of low thermal conductivity or of ceramic material, 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 thewalls 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 thewalls 4 or 4' with a platinum or palladium based catalytic 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 thewalls 4 or 4', whereupon such matter will burn by reason of the high temperature of the coils. - In addition to the emission control thus obtained, sound pressure waves carried in the gases are also damped, principally by collision with the surfaces of the spiral duct and of the outlet to the
tail pipe 13.
Claims (12)
- An anti-pollution device for the treatment of exhaust gases from internal combustion engines and burners in general, functioning also as a silencer, consisting in a spiral duct connected with at least one inlet pipe and at least one outlet pipe, characterized in that the walls of the duct are fashioned in material possessing a low coefficient of thermal conductivity.
- A device as in claim 1, wherein the walls of the spiral duct are fashioned in a ceramic material.
- A device as in claim 1, wherein the walls of the spiral duct are fashioned in metal coated with a material possessing low thermal conductivity.
- A device as in claim 1, wherein the inward facing surfaces of the walls of the spiral duct are coated with a catalytic material incorporating noble metals such as platinum, palladium and rhodium.
- A device as in claim 1, wherein the inward facing surfaces of the walls of the spiral duct exhibit projections of sawtooth profile.
- A device as in claim 1, wherein the inward facing surfaces and the outward facing surfaces of the walls of the spiral duct exhibit projections of sawtooth profile.
- A device as in claim 4, wherein the inward facing surfaces of the walls of the spiral duct exhibit projections of sawtooth profile.
- A device as in claim 4, wherein the inward facing surfaces and the outward facing surfaces of the walls of the spiral duct exhibit projections of sawtooth profile.
- A device as in claim 1, wherein the inward facing surfaces of the walls of the spiral duct are undulated.
- A device as in claim 1, wherein the inward facing surfaces and the outward facing surfaces of the walls of the spiral duct are undulated.
- A device as in claim 4, wherein the inward facing surfaces of the walls of the spiral duct are undulated.
- A device as in claim 4, wherein the inward facing surfaces and the outward facing surfaces of the walls of the spiral duct are undulated.
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 true EP0457287A2 (en) | 1991-11-21 |
EP0457287A3 EP0457287A3 (en) | 1992-01-02 |
EP0457287B1 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) |
Cited By (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 |
Citations (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 |
EP0044398A1 (en) * | 1980-07-19 | 1982-01-27 | KNECHT Filterwerke GmbH | Exhaust filter for combustion engine |
DE8912193U1 (en) * | 1989-08-05 | 1989-11-30 | Tomala, Michal, Katowice, Pl |
-
1990
- 1990-05-18 IT IT04008190A patent/IT1245938B/en active IP Right Grant
-
1991
- 1991-05-15 EP EP91107823A patent/EP0457287B1/en not_active Expired - Lifetime
- 1991-05-15 DE DE69128558T patent/DE69128558T2/en not_active Expired - Fee Related
Patent Citations (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 |
EP0044398A1 (en) * | 1980-07-19 | 1982-01-27 | KNECHT Filterwerke GmbH | Exhaust filter for combustion engine |
DE8912193U1 (en) * | 1989-08-05 | 1989-11-30 | Tomala, Michal, Katowice, Pl |
Cited By (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 |
Also Published As
Publication number | Publication date |
---|---|
DE69128558D1 (en) | 1998-02-12 |
EP0457287B1 (en) | 1998-01-07 |
EP0457287A3 (en) | 1992-01-02 |
IT9040081A0 (en) | 1990-05-18 |
IT1245938B (en) | 1994-11-05 |
IT9040081A1 (en) | 1991-11-18 |
DE69128558T2 (en) | 1998-04-16 |
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