| 摘要 |
<p>Apparatus for use in an engine exhaust system contains a catalyst (A) for the treatment of the exhaust gas in order to combat air pollution, and a non-catalytic heater (B,C) up-stream of the catalyst (A), to reduce the time it takes the catalyst (A) to reach its effective reaction temperature, the heater (B,C) having at least 15 heated channels per square cm, as measured at right angles to the gas flow through them, the heated channels being less than 1.0 cm in length, so that in operation the gas passes through the channels, and is thereby heated before it reaches the catalyst (A), the heater (B,C) being such that the heated gas leaving the channels has at least to some extent turbulent flow. <IMAGE></p> |
