NOx-reducing catalyst with temperature regulation of exhaust gas
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United States of America Patent
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Jan 25, 2005
Grant Date -
Apr 24, 2003
app pub date -
Jul 1, 2002
filing date -
Jan 5, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and arrangement for treatment of a gas-flow in connection with a NO.sub.x reducing catalyst (18) that include guiding the gas-flow through an exhaust gas treatment unit (18) having several ducts (21) with exchange of heat between the ducts (21). The ducts (21) are connected to an inlet and an outlet, respectively, at the exhaust gas treatment unit (18) so that the gas-flow occurs during exchange of heat between incoming and outgoing flows. Reduction of NO.sub.x compounds in the gas-flow is accomplished by means of the NO.sub.x reducing catalyst (18). An adaptation of the temperature of the exhaust gas treatment unit (18) is affected to the prevailing operating condition of the NO.sub.x reducing catalyst (18). The method and apparatus enable provision of the required exhaust gas temperature for NO.sub.x reduction, while also accommodating the temperature limitations imposed by sulphur absorption and regeneration subsystems.
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