EXHAUST EMISSION CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of making an air source of pressurized air to be injected into small capacity, and accurately removing soot dust adhering to a NOx catalyst.SOLUTION: An exhaust emission control device 50 of this embodiment includes a function of jetting pressurized air to soot dust adhering to a NOx catalyst 75 arranged inside a cylindrical casing part 74 and removing the soot dust. The exhaust emission control device includes a plurality of air jetting nozzles 82 arranged on the side wall of the casing part 74 upstream of the NOx catalyst 75, and configured to jet pressurized air into the casing part 74 to generate impulse waves. Each air jetting nozzle 82 jets the same amount of pressurized air sequentially one by one with a predetermined time interval and for a time t1.SELECTED DRAWING: Figure 3