Effects analysis on hydrocarbon light-off performance of a catalytic gasoline particulate filter during cold start

Bin Zhang; Xuewei Li; Qingsong Zuo; Zibin Yin; Jianping Zhang; Wei Chen; Chun Lu; Dongli Tan

doi:10.1007/s11356-022-20519-0

Effects analysis on hydrocarbon light-off performance of a catalytic gasoline particulate filter during cold start

Environ Sci Pollut Res Int. 2022 Nov;29(51):76890-76906. doi: 10.1007/s11356-022-20519-0. Epub 2022 Jun 7.

Authors

Bin Zhang^{1

2}, Xuewei Li¹, Qingsong Zuo³, Zibin Yin², Jianping Zhang¹, Wei Chen^{1

4}, Chun Lu¹, Dongli Tan⁵

Affiliations

¹ College of Mechanical Engineering, Xiangtan University, Xiangtan, 411105, China.
² Fujian Province Key Laboratory of Ship and Ocean Engineering, Jimei University, Xiamen, 361021, China.
³ College of Mechanical Engineering, Xiangtan University, Xiangtan, 411105, China. zuoqingsong100@163.com.
⁴ Foshan Green Intelligent Manufacturing Research Institute of Xiangtan University, Foshan, 528311, Guangdong, China.
⁵ School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China.

PMID: 35670934
DOI: 10.1007/s11356-022-20519-0

Abstract

In order to study the hydrocarbon combustion in the low-temperature catalytic process of a catalytic gasoline particulate filter (CGPF) during cold start, a mathematical model of the CGPF is established and verified firstly. Then, take T₅₀ (a temperature when the hydrocarbon conversion rate reaches 50%) as hydrocarbon light-off (LO) temperature; the effects of different exhaust parameters and structural parameters on hydrocarbon light-off performance and reaction rate are investigated based on simulation results. Finally, orthogonal experiment analysis is employed to further obtain the most significant factors and suggested parameter solution. The results show that the hydrocarbon LO performance of the CGPF during cold start is positively correlated with exhaust oxygen concentration, porosity, and filter length, but it is negatively correlated with exhaust flow rate and exhaust water vapor concentration. In addition, the inlet of the channel has a significant HC reaction when the oxygen concentration reaches 2.2%, and porosity mainly influences the front half part of the filter. Moreover, the influence degree relationship of the five factors is oxygen > mass flow > porosity > length > water vapor, and the optimum solution of length, vapor, mass flow, porosity, and oxygen is 150 mm, 12.31%, 0.002 kg/s, 0.55, and 2.2%, respectively. This work offers us great reference value for CGPF performance enhancement and hydrocarbon abatement of a GDI engine.

Keywords: Catalytic gasoline particulate filter; Catalytic reaction; Cold start; Hydrocarbon; Light-off temperature.