The present invention has an object to provide an exhaust device for a diesel engine capable of surely burning flammable gas in an exhaust route. In the exhaust device for the diesel engine, liquid fuel (6) is supplied from a liquid-fuel supply source (5) to a gas generator (3). The gas generator (3
The present invention has an object to provide an exhaust device for a diesel engine capable of surely burning flammable gas in an exhaust route. In the exhaust device for the diesel engine, liquid fuel (6) is supplied from a liquid-fuel supply source (5) to a gas generator (3). The gas generator (3) converts the liquid fuel (6) to flammable gas (7) and has a flammable-gas flow outlet (9) of the with which an exhaust route (1) is communicated upstream of a diesel-particulate-filter (2). The flammable gas (7) flowed out from the flammable-gas flow outlet (9) is burnt with oxygen in exhaust gas (10) to produce combustion heat. The exhaust gas (10) heated by the thus produced combustion heat can burn the exhaust-gas fine particles remaining at the filter (2). The gas generator (3) is provided with a catalyst chamber (51) which houses a catalyst (4). Catalyst-combustion heat is generated in the catalyst chamber (51) which is arranged along an external periphery of a peripheral wall (1a) of the exhaust route (1).
대표청구항▼
1. An exhaust device for a diesel engine which supplies liquid fuel (6) from a liquid-fuel supply source (5) to a gas generator (3) which converts the liquid fuel (6) to flammable gas (7), a flammable-gas flow outlet (9) of the gas generator (3) being communicated with an exhaust route (1) upstream
1. An exhaust device for a diesel engine which supplies liquid fuel (6) from a liquid-fuel supply source (5) to a gas generator (3) which converts the liquid fuel (6) to flammable gas (7), a flammable-gas flow outlet (9) of the gas generator (3) being communicated with an exhaust route (1) upstream of a diesel-particulate-filter (2), the flammable gas (7) flowed out from the flammable-gas flow outlet (9) being burnt with oxygen in exhaust gas (10) to generate combustion heat, the exhaust gas (10) heated by the combustion heat being able to burn exhaust-gas fine particles remaining at the filter (2), wherein the gas generator (3) is provided with a catalyst chamber (51) which houses a catalyst (4) and within which catalyst-combustion heat is produced, the catalyst chamber (51) being arranged along an external periphery of a peripheral wall (1a) of the exhaust route (1), wherein a partition wall (14) provided within the peripheral wall (1a) of the exhaust route (1) divides an interior area of the exhaust route (1) into a flammable-gas mixing passage (15) and an exhaust-gas passage (16), a starting end portion (15a) of the flammable-gas mixing passage (15) being communicated with the flammable-gas flow outlet (9), an ignition means (45) comprising an igniting electric heater (45a) arranged at a predetermined portion in a region extending from an interior area of the flammable-gas mixing passage (15) to just after its terminal end portion (15b), the flammable gas (7) heated within the catalyst chamber (51) being mixed with part (10a) of the exhaust gas (10) in the flammable-gas mixing passage (15), and the ignition means (45) igniting the flammable gas (7). 2. The exhaust device for a diesel engine as set forth in claim 1, wherein the catalyst chamber (51) is arranged over an entire area in a peripheral direction of the peripheral wall (1a) of the exhaust route (1). 3. The exhaust device for a diesel engine as set forth in claim 1, wherein an outlet-side flange (1c) is provided at an end portion downstream of the exhaust-route peripheral wall (1a) and an inlet-side flange (11c) is provided at a case (11) which houses the filter (2), and when connecting the outlet-side flange (1c) of the exhaust-route peripheral wall (1a) to the inlet-side flange (11c) of the filter-housing case (11), a cylindrical wall (1d) is provided inside the exhaust route (1) and a heat-insulation space (1e) is defined between the cylindrical wall (1d) and the peripheral wall (1a) of the exhaust route (1) as well as between the cylindrical wall (1d) and the outlet-side flange (1c). 4. The exhaust device for a diesel engine as set forth in claim 1, wherein an oxidation catalyst (12) is arranged downstream of the ignition means (45) and upstream of the filter (2). 5. The exhaust device for a diesel engine as set forth in claim 1, wherein fuel from a fuel reservoir (5a) of the diesel engine is employed for the liquid fuel (6), and when mixing air (44) into the liquid fuel (6), air (44) from a supercharger (39) is used for the air (44). 6. The exhaust device for a diesel engine as set forth in claim 1, wherein the liquid fuel (6) is vaporized in the catalyst chamber (51), thereby converting the liquid fuel (6) to the flammable gas (7). 7. The exhaust device for a diesel engine as set forth in claim 1, wherein the liquid fuel (6) is partially oxidized in the catalyst chamber (51), thereby reforming the liquid fuel (6) to flammable gas (7) containing carbon monoxide and hydrogen. 8. The exhaust device for a diesel engine as set forth in claim 1, wherein the flammable-gas mixing passage (15) has a sectional area varying along a flow direction. 9. The exhaust device for a diesel engine as set forth in claim 8, wherein the flammable-gas mixing passage (15) has the sectional area increasing gradually toward the downstream. 10. The exhaust device for a diesel engine as set forth in claim 1, wherein a substrate (4a) of the catalyst (4) forms a mixed air passage of cubic-mesh shape. 11. The exhaust device for a diesel engine as set forth in claim 10, wherein a pellet-like substrate is used for the substrate (4a) and a gap between adjacent substrates (4a) and (4a) defines the mixed air passage of cubic-mesh shape. 12. The exhaust device for a diesel engine as set forth in claim 1, wherein a mixer (52) is disposed on a side of an inlet (51a) of the catalyst chamber (51) and the liquid fuel (6) supplied from a fuel nozzle (53) is mixed with air (44) in a mixing chamber (55), and when supplying mixed air (56) from the outlet (57) of the mixing chamber (55) to the inlet (51a) of the catalyst chamber (51), the catalyst-combustion heat produced in the catalyst chamber (51) is conveyed to the fuel nozzle (53) by a heat conductor (58). 13. The exhaust device for a diesel engine as set forth in claim 12, wherein the heat conductor (58) has an exposed surface (58a) arranged in a position opposite to the inlet (51a) of the catalyst chamber (51) and the liquid fuel (6) that has flowed out from the outlet (57) of the mixing chamber (55) is brought into contact with the exposed surface (58a) of the heat conductor (58). 14. The exhaust device for a diesel engine as set forth in claim 13, wherein an electric heater (65) is brought into contact with the heat conductor (58) so as to heat the heat conductor (58) when commencing the generation of the flammable gas. 15. An exhaust device for a diesel engine which supplies liquid fuel (6) from a liquid-fuel supply source (5) to a gas generator (3) which converts the liquid fuel (6) to flammable gas (7), a flammable-gas flow outlet (9) of the gas generator (3) being communicated with an exhaust route (1) upstream of a diesel-particulate-filter (2), the flammable gas (7) flowed out from the flammable-gas flow outlet (9) being burnt with oxygen in exhaust gas (10) to generate combustion heat, the exhaust gas (10) heated by the combustion heat being able to burn exhaust-gas fine particles remaining at the filter (2), the gas generator (3) provided with a catalyst chamber (51) which houses a catalyst (4) and within which catalyst-combustion heat is produced, the catalyst chamber (51) being arranged along an external periphery of a peripheral wall (1a) of the exhaust route (1), wherein a partition wall (14) provided within the peripheral wall (1a) of the exhaust route (1) divides an interior area of the exhaust route (1) into a flammable-gas mixing passage (15) and an exhaust-gas passage (16), a starting end portion (15a) of the flammable-gas mixing passage (15) being communicated with the flammable-gas flow outlet (9), an ignition means (45) arranged at a predetermined portion in a region extending from an interior area of the flammable-gas mixing passage (15) to just after its terminal end portion (15b), and the flammable gas (7) heated within the catalyst chamber (51) being mixed with part (10a) of the exhaust gas (10) in the flammable-gas mixing passage (15), and the ignition means (45) ignites the flammable gas (7),wherein an outlet-side flange (1c) provided at an end portion downstream of the exhaust-route peripheral wall (1a) and an inlet-side flange (11c) provided at a case (11) which houses the filter (2), and when connecting the outlet-side flange (1c) of the exhaust-route peripheral wall (1a) to the inlet-side flange (11c) of the filter-housing case (11), a cylindrical wall (1d) provided inside the exhaust route (1) and a heat-insulation space (1e) defined between the cylindrical wall (1d) and the peripheral wall (1a) of the exhaust route (1) as well as between the cylindrical wall (1d) and the outlet-side flange (lc). 16. The exhaust device for a diesel engine as set forth in claim 15, wherein the ignition means (45) is an igniting electric heater (45a). 17. The exhaust device for a diesel engine as set forth in claim 15, wherein the exhaust-route peripheral wall (1a) with the catalyst chamber (51) arranged along the same serves as a heat radiation wall (8), which is used for the ignition means (45). 18. An exhaust device for a diesel engine which supplies liquid fuel (6) from a liquid-fuel supply source (5) to a gas generator (3) which converts the liquid fuel (6) to flammable gas (7), a flammable-gas flow outlet (9) of the gas generator (3) being communicated with an exhaust route (1) upstream of a diesel-particulate-filter (2), the flammable gas (7) flowed out from the flammable-gas flow outlet (9) being burnt with oxygen in exhaust gas (10) to generate combustion heat, the exhaust gas (10) heated by the combustion heat being able to burn exhaust-gas fine particles remaining at the filter (2), the gas generator (3) provided with a catalyst chamber (51) which houses a catalyst (4) and within which catalyst-combustion heat is produced, the catalyst chamber (51) being arranged along an external periphery of a peripheral wall (1a) of the exhaust route (1), and a substrate (4a) of the catalyst (4) forming a mixed air passage of cubic-mesh shape, wherein when pellet-like ceramic is used for the substrate (4a) and a gap between adjacent substrates (4a) and (4a) defines the mixed air passage of cubic-mesh shape, the substrates (4a), (4a) are mixed with metal springs (66) and the thus formed mixture is housed in the catalyst chamber (51), the metal springs (66) serving as a cushion for the substrate (4a).
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (1)
Blaschke Walter,DEX, Burner for the thermal regeneration of a particle filter in an exhaust gas aftertreatment system of an internal combust.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.