Exhaust gas purification system for lean burn engine
Abstract
An exhaust gas purification system for a lean burn engine includes a thermal mass unit and a NO.sub.x conversion catalyst unit downstream of the thermal mass unit. The NO.sub.x conversion catalyst unit includes at least one catalyst section. Each catalyst section includes a catalytic layer for converting NO.sub.x coupled to a heat exchanger. The heat exchanger portion of the catalyst section acts to maintain the catalytic layer substantially at a desired temperature and cools the exhaust gas flowing from the catalytic layer into the next catalytic section in the series. In a further aspect of the invention, the exhaust gas purification system includes a dual length exhaust pipe upstream of the NO.sub.x conversion catalyst unit. The dual length exhaust pipe includes a second heat exchanger which functions to maintain the temperature of the exhaust gas flowing into the thermal mass downstream near a desired average temperature.
- Inventors:
-
- Northville, MI
- Issue Date:
- Research Org.:
- Midwest Research Institute, Kansas City, MO (United States)
- OSTI Identifier:
- 874239
- Patent Number(s):
- 6347511
- Application Number:
- 09/469,040
- Assignee:
- Ford Global Technologies, Inc. (Dearborn, MI)
- Patent Classifications (CPCs):
-
F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01N - GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02T - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- DOE Contract Number:
- AC36-83CH10093; ZCB-4-13032-02
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- exhaust; gas; purification; lean; burn; engine; thermal; mass; unit; nosubx; conversion; catalyst; downstream; section; catalytic; layer; converting; coupled; heat; exchanger; portion; maintain; substantially; temperature; cools; flowing; series; aspect; dual; length; pipe; upstream; functions; near; average; heat exchanger; gas flow; exhaust gas; lean burn; thermal mass; /60/422/
Citation Formats
Haines, Leland Milburn. Exhaust gas purification system for lean burn engine. United States: N. p., 2002.
Web.
Haines, Leland Milburn. Exhaust gas purification system for lean burn engine. United States.
Haines, Leland Milburn. Tue .
"Exhaust gas purification system for lean burn engine". United States. https://www.osti.gov/servlets/purl/874239.
@article{osti_874239,
title = {Exhaust gas purification system for lean burn engine},
author = {Haines, Leland Milburn},
abstractNote = {An exhaust gas purification system for a lean burn engine includes a thermal mass unit and a NO.sub.x conversion catalyst unit downstream of the thermal mass unit. The NO.sub.x conversion catalyst unit includes at least one catalyst section. Each catalyst section includes a catalytic layer for converting NO.sub.x coupled to a heat exchanger. The heat exchanger portion of the catalyst section acts to maintain the catalytic layer substantially at a desired temperature and cools the exhaust gas flowing from the catalytic layer into the next catalytic section in the series. In a further aspect of the invention, the exhaust gas purification system includes a dual length exhaust pipe upstream of the NO.sub.x conversion catalyst unit. The dual length exhaust pipe includes a second heat exchanger which functions to maintain the temperature of the exhaust gas flowing into the thermal mass downstream near a desired average temperature.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {2}
}