| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique which can appropriately suppress the deterioration of denitrification rate and external discharge of reductant by optimizing a control value of injection amount of the reductant into exhaust gas with inexpensive configuration, in a reductant injection device for injecting the reductant while controlling the injection amount to the exhaust gas discharged from an engine and denitrification equipment applying the reductant injection device.SOLUTION: A load detection means for detecting a load of an engine and a humidity detection means for detecting humidity in combustion air to be supplied to the engine are disposed. An injection amount control means reduces an injection amount of the reductant as the humidity in the combustion air detected by the humidity detection means gets to higher, and the proportion of reducing the injection amount of the reductant for humidity rise of the combustion air is enlarged as the load of the engine detected by the load detection means gets to higher. |
