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Title: 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:
 [1]
  1. (Northville, MI)
Issue Date:
Research Org.:
Midwest Research Institute
OSTI Identifier:
874239
Patent Number(s):
6347511
Application Number:
09/469,040
Assignee:
Ford Global Technologies, Inc. (Dearborn, MI) NREL
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}
}

Patent:

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