US6428754.pdf (615.25 kB)
Method and Apparatus for treating exhaust gases
standard
posted on 2016-06-07, 00:00 authored by David T. Leighton, Hsueh-Chia ChangHsueh-Chia ChangAn exhaust gas treatment system and method for treating the exhaust gas of an internal combustion engine includes a catalytic converter and a catalytic preheater or igniter upstream of the catalytic converter. A bypass passage extends around the igniter such that during the ignition period about two-thirds of the exhaust gas is bypassed around the igniter and one-third passes through the igniter. The igniter raises the temperature of the exhaust gases passing therethrough to an adiabatic temperature of about 900.degree. K. Accordingly, the flow through the igniter combined with the flow through the bypass passage raises the average temperature of the combined exhaust gases to approximately 700.degree. K., which is sufficient to ignite the catalytic converter at substantially the leading edge thereof. Accordingly, normal convective flow of the exhaust gases through the catalytic converter assists in propagating ignition of the converter. A temperature sensor in the catalytic converter causes a controller to operate a valve to divert substantially all of the exhaust gas flow through the bypass passage after the catalytic converter has ignited.
History
Patent Number
US 6428754 B2Other Application
08/382,296Inventor
Hsueh-Chia Chang David T. LeightonInventor from Local Institution
Hsueh-Chia Chang David T. LeightonAssignee
NONEDate Modified
2016-06-07Language
- English
Claims
7Publisher
United States Patent and Trademark OfficeCooperative Patent Classification Codes
B01D 53/9454 (20130101); Y02T 10/22 (20130101)Contributor
Hsueh-Chia Chang|David T. LeightonInternational Patent Classification Codes
B01D 53/94 (20060101); B01D 053/86 ()US Patent Classification Codes
422/168; 423/213.2;Additional Groups
- Aerospace and Mechanical Engineering
- Chemical and Biomolecular Engineering
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