Apparatus and Method for NOx Reduction
First Claim
1. A system for reducing oxides of nitrogen (NOx) in the exhaust stream produced by an internal combustion engine operating at lean air/fuel ratios into non polluting emissions comprising:
- (a) a reducing catalyst on a monolith or other suitable catalytic converter;
(b) a multi-mode fuel processor of liquid hydrocarbon fuel such as diesel capable of delivering a required quantity and composition of a reducing agent while operating in a desired sequence of at least the following modes;
partial oxidation, incomplete pyrolysis, evaporation, combustion, atomization;
(c) means to introduce said reducing agent into said exhaust stream; and
(d) means to implement a predetermined control algorithm.
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Abstract
Apparatus and method for NOx reduction. A reducing catalyst is provided on a monolith or other suitable catalytic converter element. A multi-mode fuel processor of liquid hydrocarbon fuel is capable of delivering a required quantity and composition of a reducing agent while operating in a desired sequence of the following modes: partial oxidation, incomplete pyrolysis, evaporation, combustion, and atomization. Temperature sensors detect the catalyst temperature and means are provided to introduce the reducing agent into the exhaust stream at a rate correlated to the measured temperature. Means also provided to implement a predetermined control algorithm.
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Citations
24 Claims
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1. A system for reducing oxides of nitrogen (NOx) in the exhaust stream produced by an internal combustion engine operating at lean air/fuel ratios into non polluting emissions comprising:
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(a) a reducing catalyst on a monolith or other suitable catalytic converter; (b) a multi-mode fuel processor of liquid hydrocarbon fuel such as diesel capable of delivering a required quantity and composition of a reducing agent while operating in a desired sequence of at least the following modes;
partial oxidation, incomplete pyrolysis, evaporation, combustion, atomization;(c) means to introduce said reducing agent into said exhaust stream; and (d) means to implement a predetermined control algorithm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification