| 摘要 |
<p>PURPOSE:To unnecessitate replacement work of a catalytic element due to service life by providing a control part for controlling a water solution quantity supplied to a nozzle, connecting a memory in which a supply quantity of the water solution is set to a computing part, and connecting the computing part to the control part. CONSTITUTION:A reactor 5 is formed upstream of a muffler 4 in an exhaust pipe 3. Three nozzles 6a in a container 7 are connected to the reactor 5. Water solution 8 of an azide compound is stored in the container 7. A switching valve 9 for controlling a supply quantity of the solution 8 is provided in a supply pipe 6 and a control part 10 is connected to the valve 9. A concentration sensor 11, a torque sensor 13 and a rotation sensor 14 are connected to a CPU computing part 15, which computes the quantity of the water solution 8 to be supplied to the reactor 5. This CPU computing part 15 is connected to the control part 10 via a converter 17. Deterioration of a catalyst is thus prevented without lowering a denitration rate.</p> |
