Experimental Study of Twintwist flow SCR Mixer for China Ⅵ Diesel Engine

ZHANG Xiaoli; WANG Xia; RONG Chao; SHI Dailong; AN Bang; WANG Dongsheng; YANG Yongchun

Vehicle Engine ›› 2021, Vol. 0 ›› Issue (2) : 49-55.

ZHANG Xiaoli,WANG Xia,RONG Chao,SHI Dailong,AN Bang,WANG Dongsheng,YANG Yongchun

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Abstract

For the urea crystallization problems of SCR at low exhaust temperature and low load, the combination of CFD and experiment were used to optimize a singleswirl SCR mixer of a heavyduty China Ⅵ diesel engine, and a twintwist flow SCR mixer was designed. Then singlepoint NO_x conversion efficiency test, WHTC and 10 h verification test for urea crystallization were conducted on the test bench. The simulation results show that the twintwist flow SCR mixer can promote the mixing between urea solution and exhaust gas so as to evaporate and decompose quickly and leads to the increase of the distribution uniformity of NH₃ concentration by 15.19%. The test results show that the twintwist flow SCR mixer can increase NO_x conversion rate by 1.58, 1.78% and 0.38% respectively corresponding to ANR of 0.7, 0.9 and 1.2 and the NO_x emission obviously reduces. The crystallization does not occur on the wall of SCR mixer and the problem is hence solved.

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/ mso-hansi-font-family: 宋体">diesel engine;SCR;mixer;optimization and design;urea crystallization

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ZHANG Xiaoli,WANG Xia,RONG Chao,SHI Dailong,AN Bang,WANG Dongsheng,YANG Yongchun. Experimental Study of Twintwist flow SCR Mixer for China Ⅵ Diesel Engine[J]. Vehicle Engine. 2021, 0(2): 49-55