NOx CLEANING DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To suppress the stay of urea water by straightening the flow of pressurized air in a supply passage and to prevent the solid form of the urea water in the supply passage and the clogging due to the solid form.

SOLUTION: To a NOx catalyst 17 provided in an exhaust pipe 28 in an engine 1 for selectively reducing NOx in exhaust gas, the urea water 40 supplied via the supply passage 31 communicating with the exhaust pipe on the upstream side of the catalyst with reducer supply means 30 is supplied while being mixed with the pressurized air supplied from a supply passage 31A located upstream beyond a supply region 41 for the urea water supplied from the reducer supply means 30 with air supply means 7. A straightening member 4 is provided in the supply passage 31A downstream beyond a supply region for the pressurized air and upstream beyond the supply region 41 for the urea water for straightening the pressurized air upstream beyond the supply region 41.

COPYRIGHT: (C)2004,JPO