SYSTEM FOR AFTER-TREATMENT OF EXHAUST GAS AND METHOD FOR CONTROLLING OF THE SAME

The present invention provides a system for post-treatment of an exhaust gas which is mounted on an exhaust pipe of an internal combustion engine and sequentially has, on the upstream side, a diesel particulate matter filter (DPF) and a selective catalyst reduction (SCR) technology. The system furth...

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Bibliographische Detailangaben
Hauptverfasser:	KANG DAE GYUN, CHOI EUN SEK, LEE YANG RO, AN GEY WON, LEE KANG HONG
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING STEAM ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	The present invention provides a system for post-treatment of an exhaust gas which is mounted on an exhaust pipe of an internal combustion engine and sequentially has, on the upstream side, a diesel particulate matter filter (DPF) and a selective catalyst reduction (SCR) technology. The system further includes: a burner positioned upstream of the DPF to heat an exhaust gas from the internal combustion engine; a hydrocarbon injector positioned upstream of the DPF to spray hydrocarbon to the exhaust gas; and a control unit controlling the burner and the hydrocarbon injector according to a first mode for removing nitrogen oxides or a second mode for removing particulates. When the temperature of the exhaust gas does not reach the operating temperature of the SCR, the control unit operates the burner according to the first mode to heat the exhaust gas to the operating temperature of the SCR, or operates the burner while spraying hydrocarbon by using the hydrocarbon injector according to the second mode to heat the exhaust gas to the particle removal temperature of the DPF. Thus, the system can use a small-capacity burner and hydrocarbon injection, thereby extending an operating area thereof to a low-temperature area. 본 발명은 내연기관의 배기관에 장착되어 상류측에서 순차대로 미립자포집장치(DPF; Diesel Particulate matter Filter)와 선택적환원촉매장치(SCR; Selective Catalyst Reduction)를 구비한 배기가스 후처리 시스템에 있어서, 상기 미립자포집장치의 상류측에 위치하여 상기 내연기관의 배기가스를 승온시키기 위한 버너, 상기 미립자포집장치 상류측에 위치하여, 상기 배기가스에 탄화수소를 분사하는 탄화수소인젝터, 및 질소산화물을 제거하기 위한 제1 모드 또는 미립자를 제거하기 위한 제2 모드에 따라 상기 버너와 상기 탄화수소인젝터를 제어하는 제어부를 더 포함하되, 상기 제어부는, 상기 배기가스의 온도가 상기 선택적환원촉매장치의 작동온도에 미치지 않을 경우에는, 상기 제1 모드에 따라 상기 버너를 작동하여 상기 배기가스를 상기 선택적환원촉매장치의 작동온도까지 승온시키거나, 상기 제2 모드에 따라 상기 탄화수소인젝터를 이용하여 탄화수소를 분사함과 동시에 상기 버너를 작동하여 상기 미립자포집장치의 미립자 제거온도까지 승온시키는 것을 특징으로 하는 배기가스 후처리 시스템을 제공한다.