REDUCING AGENT SUPPLYING DEVICE

A reducing agent supplying device is for a fuel combustion system that includes a NOx purifying device (15) with a reducing catalyst arranged in an exhaust passage (10ex) to purify NOx contained in exhaust gas of an internal combustion engine (10). The reducing agent supplying device supplies a redu...

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Bibliographische Detailangaben
Hauptverfasser:	YAHATA, SHIGETO, MAJIMA, YUSUKE, KINUGAWA, MASUMI, HOSODA, MAO, TARUSAWA, YUUKI
Format:	Patent
Sprache:	eng ; fre ; ger
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:	A reducing agent supplying device is for a fuel combustion system that includes a NOx purifying device (15) with a reducing catalyst arranged in an exhaust passage (10ex) to purify NOx contained in exhaust gas of an internal combustion engine (10). The reducing agent supplying device supplies a reducing agent into the exhaust passage at a position upstream of the reducing catalyst. The reducing agent supplying device includes a reforming portion (30, 50) and a reformation suppressing portion (S54, S55). The reforming portion (30, 50) reforms the reducing agent by partially oxidizing the reducing agent. When a temperature of the reducing agent is higher than a first specified temperature (T1) that is equal to or higher than an activation temperature of the reducing catalyst (about 400°C), the reformation suppressing portion (S54, S55) (i) suppresses the degree of reformation of the reducing agent in comparison with when a temperature of the reducing agent is lower than the first specified temperature (T1), or (ii) stops the reformation of the reducing agent.