| 摘要 |
<p>An apparatus and a method for regenerating an NOx catalyst for a diesel engine which are capable of regenerating an NOx catalyst which as a lower performance due to accumulated SOx. The regeneration apparatus is provided with an NOx catalyst (3) placed in an exhaust pipe (2), a reductant fuel addition nozzle (7), a flow rate control valve (10) for controlling a feed rate of a reductant fuel supplied to the reductant fuel addition nozzle (7), a sensor (14) for detecting the inlet temperature of the NOx catalyst (3), and a regeneration controller (17) adapted to compute the quantity of SOx taken into the NOx catalyst (3) during a period of time in which the inlet temperature of the reductant fuel is not higher than a predetermined level with a zero feed rate instruction given to the flow rate control valve (10), an output, when the inlet temperature becomes higher than a predetermined level to start adding the reductant fuel, an instruction for supplying the reductant fuel the quantity of which is larger than a predetermined quantity thereof and suitable for the operational condition of a diesel engine (1) to the flow rate control valve (10).</p> |
