EXHAUST EMISSION CONTROL DEVICE

PROBLEM TO BE SOLVED: To provide an exhaust emission control device improving a NOx conversion efficiency and a DPF (Diesel Particulate Filter) regeneration efficiency by an SCR (Selective Catalytic Reduction) catalyst regardless of temperature of an oxidation catalyst including platinum. SOLUTION:...

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Bibliographische Detailangaben
Hauptverfasser:	KATO YOSHIFUMI, KOIDE NAOTAKA
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION STEAM ENGINES TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an exhaust emission control device improving a NOx conversion efficiency and a DPF (Diesel Particulate Filter) regeneration efficiency by an SCR (Selective Catalytic Reduction) catalyst regardless of temperature of an oxidation catalyst including platinum. SOLUTION: The oxidation catalyst 3 including platinum, the DPF 5, the SCR catalyst 6, and an oxidation catalyst 7 are provided in an exhaust pipe 2 for allowing exhaust gas discharged from a diesel engine 1 to circulate. An injection nozzle 8 injecting urea water is provided between the DPF 5 and the SCR catalyst 6. The exhaust pipe 2 is provided with a bypass pipe 20 bypassing the oxidation catalyst 3. A cross valve 21 is provided in the connection of the upstream end of the bypass pipe 20 and the exhaust pipe 2. A first temperature sensor 9 and a second temperature sensor 10 for measuring temperature of exhaust gas circulating through the exhaust pipe 2 are respectively provided upstream of the SCR catalyst 6 and cross valve 21. COPYRIGHT: (C)2010,JPO&INPIT