New NSR Technology of C3H6 Pulse Jet

CHEN Shun; SONG Guijin; LIU Min; YE Jing'an; LIU Xing; HU Kun; GUAN Bin; ZHAN Rijing; LIN He; HUANG Zhen

Vehicle Engine ›› 2020, Vol. 0 ›› Issue (2) : 9-14.

New NSR Technology of C₃H₆Pulse Jet

CHEN Shun¹,SONG Guijin¹,LIU Min²,YE Jing'an²,LIU Xing²,HU Kun²,GUAN Bin¹,ZHAN Rijing¹,LIN He¹,HUANG Zhen¹

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Abstract

The leanburn engine has the advantage of low fuel consumption and also the disadvantage of high NO_x emission. The traditional SCR technology cannot be applied to light passenger vehicle due to its large size. The NO_x removal of leanburn engine is mainly achieved by NSR catalyst, which cannot achieve high NO_x conversion rate yet at high temperature and high space velocity. Through the experimental research, a new NSR technology for NO_x removal of lean-burn engine exhaust was proposed. By injecting a hydrocarbon reductant at the front end of NSR catalyst with a certain frequency, the reductive and active intermediate species such as —CN and —NCO formed on the NSR catalyst. The intermediate species generated continuously and were consumed to reduce the NO_x pollutants adsorbed on the NSR catalyst during the pulse jet of C₃H₆ and the NSR catalyst then regenerated. By adopting this technology, the engine could be running in a leanburn condition, which meant that it was not necessary to switch to the richburn condition. Therefore the operation was simple and the control cost was low. The experimental results show that this system can broaden the temperature window of NO_x removal and maintain NO_xconversion efficiency of more than 90% in the range of exhaust gas temperature between 350 ℃ and 550 ℃. In addition, the key influencing parameters of the system are also explored including the reaction temperature, the space velocity, the hydrocarbon fuel injection frequency and quantity and the air-fuel ratio.

Key words

lean-burn engine / NSR catalyst / pulse jet / active species / partial metallization

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CHEN Shun,SONG Guijin,LIU Min,YE Jing'an,LIU Xing,HU Kun,GUAN Bin,ZHAN Rijing,LIN He,HUANG Zhen. New NSR Technology of C₃H₆Pulse Jet[J]. Vehicle Engine. 2020, 0(2): 9-14