REDUCTANT SUPPLY DEVICE AND METHOD FOR OPERATING REDUCTANT SUPPLY DEVICE

摘要

(Task) To suppress the unbalance of local concentration distribution of reducing agent due to the influence of drift caused by obstacles. (Solution means) The reducing agent supply device for supplying a reducing agent upstream of the SCR catalyst in the exhaust gas flow path in which the obstacles are arranged, crosses the flow direction of the exhaust gas in the downstream of the obstacle in the flow direction of the exhaust gas. It includes a plurality of spray nozzles arranged at intervals along one direction, and a plurality of reducing agent supply lines for supplying a reducing agent to the plurality of spray nozzles. Among the plurality of injection nozzles, when the injection nozzle located downstream of the obstacle is defined as the first injection nozzle and the injection nozzle not located downstream is defined as the second injection nozzle, the plurality of injection nozzles are the same reducing agent supply line A plurality of spray nozzle groups including at least one spray nozzle to which a reducing agent is supplied by, a first spray nozzle group, which is a spray nozzle group including a first spray nozzle, and a second spray nozzle group including a second spray nozzle. It is divided into a plurality of spray nozzle groups including a spray nozzle group.