Method and apparatus for supplying a reductant to an engine exhaust treatment system
US6898929B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2003 |
| Grant date | May 31, 2005 |
| Priority date | — |
| Expiry date | Jul 25, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N2610/10
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method and apparatus for providing a vaporized reductant to an engine exhaust stream find particular utility in the regeneration of a nitrous oxide absorber in a Diesel engine exhaust treatment system. The method and apparatus are based on fueling the Diesel engine with a mixture of Diesel oil and an alcohol, such as methanol. At least a portion of the alcohol vaporizes in the fuel tank, or is forced to vaporize by passing the fuel mixture through a heat exchanger. The vapor is then stored in a canister for subsequent selective injection of the alcohol into the exhaust stream upstream of the adsorber. The alcohol then thermally decomposes to provide sufficient hydrogen and carbon monoxide to regenerate the adsorber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.