SCR系统控制PODE/甲醇混合燃料NO<sub>x</sub>排放的仿真

doi:10.3969/j.issn.1671-7775.2022.04.009

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Abstract To control the NO_x emission of polyoxymethylene dimethyl ethers (PODE)/methanol blend fuel, the simulation model of selective catalytic reduction (SCR) system was established based on Converge software, and the influence of SCR system on the NO_x emission of PODE/methanol blend fuel was investigated by numerical simulation. The results show that with the increasing of n(NH₃)/n(NO_x), NH₃ distribution uniformity, velocity distribution uniformity and NO_x conversion efficiency of SCR system are increased firstly with latter decreasing, while the leakage of NH₃ is increased gradually. When the n(NH₃)/n(NO_x) is 1.3, the γ_NH3reaches the highest value of 0.988 with the maximum μ_ν value of 0.983 and the NO_xconversion efficiency of 81.4%. Mixers can effectively improve the performance of SCR system. According to the optimization of SCR mixer by orthogonal experiment, the optimal scheme is obtained with the mixer blade number of 16, the blade inclination of 30° and the blade width of 16 mm, and the optimization scheme is verified by bench test. The NO_x conversion efficiency of the optimized SCR system is 75.4% ，and the leakage of NH₃ is reduced by 9.6×10^-7 for the diesel engine at 1 800 r·min^-1 and 100% load.

Key words： polyoxymethylene dimethyl ethers methanol diesel engine selective catalytic reduction nitrogen oxide

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	Articles by authors
	JI Qian
	ZHAO Lian
	TAN Bingqian
	LIU Junheng
	WEI Mingliang

Cite this article:

JI Qian,ZHAO Lian,TAN Bingqian等. Simulation on NO_x emission of SCR system with PODE/methanol blend fuel[J]. Journal of Jiangsu University(Natural Science Eidtion), 2022, 43(4): 431-438.

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http://zzs.ujs.edu.cn/xbzkb/EN/10.3969/j.issn.1671-7775.2022.04.009 OR http://zzs.ujs.edu.cn/xbzkb/EN/Y2022/V43/I4/431

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