Patent ID: 9021792
Filing Date: 2015-05-05
Classification: B01D,C01B,F01N,Y02T

Abstract:
1. An exhaust gas purification device comprising: a selective catalytic reduction catalyst capable of reducing NO a fluid feed comprising: an ozone feed comprising: a controller configured to regulate the pump, the fluid pressure regulating valve, the fluid opening/closing valve, the compressor, the ozone convertor, and the ozone feed rate regulating valve in accordance with engine rotation speed, engine load, and exhaust gas temperature of the selective catalytic reduction catalyst inlet, wherein: the controller drives the compressor, the ozone converter, and the ozone feed rate regulating valve so as to intermittently inject the ozone from the ozone injecting nozzle to the exhaust pipe, and drives the pump, the fluid pressure regulating valve, and the opening/closing valve so as to intermittently inject the urea fluid from the urea injecting nozzle to the exhaust pipe, when the exhaust gas temperature of the selective catalytic reduction catalyst inlet is 100 to 200° C. and the engine is in a no-load operation, and the controller stops driving the compressor, the ozone converter, and the ozone feed rate regulating valve so as to stop injecting the ozone from the ozone injecting nozzle to the exhaust pipe, and drives the pump, the fluid pressure regulating valve, and the opening/closing valve so as to intermittently inject the urea fluid from the urea injection nozzle to the exhaust pipe, when the exhaust gas temperature of the selective catalytic reduction catalyst inlet is 200° C. or more.