| 摘要 |
PROBLEM TO BE SOLVED: To provide a NOx aftertreatment device of an engine which can purify NOx immediately after start-up and speedily realizes a necessary and sufficient ozone supply flow rate in accordance with a change in a NOx flow rate without requiring a large-scale device.SOLUTION: A NOx aftertreatment device 3 removes NOx from exhaust in a manner that connects an exhaust pipe 2a of an engine 1 having a turbocharger 15 to an ozone supply passage 31 supplying ozone generated by ozone generation means 6 and converts the NOx in the exhaust into nitric acid or precursor thereof with the ozone. The ozone generation means 6: takes in a portion of incoming air supercharged from an air inflow passage 32 connected to an intake pipe 18 of the engine 1; and produces the ozone by generating discharge plasma in a discharge space section 63. Also, a controller 4 controls an ozone generation flow rate in accordance with an operation state of the engine 1. |
