A kind of diesel SCR catalytic device sulfur poisoning cancellation element and its application method

A kind of diesel SCR catalytic device sulfur poisoning cancellation element, including DOC, DPF, SCR catalyst, the bypass line with electric controlled regulating valve, aftertreatment controller, the inlet end of DOC passes sequentially through air inlet pipeline, turbocharger is connected to the exhaust pipe of engine, exhaust end is communicated by DPF with SCR catalyst, the inlet and outlet end of bypass line is communicated with exhaust pipe, air inlet pipeline respectively, and No.1 temperature sensor, No.1 NO are provided on air inlet pipeline X Sensor, dpf regeneration fuel nozzle, the inlet and outlet end of DPF are provided with pressure sensor, and the inlet and outlet end of SCR catalyst is respectively arranged with No. two temperature sensors, No. two NO X Sensor, in use, aftertreatment controller is according to whether the operating condition of dpf regeneration and diesel engine controls dpf regeneration fuel nozzle and electric controlled regulating valve, to meet the hot conditions of SCR catalyst desulfurization.The design is so that engine fuel economy deterioration degree is lower.