满足超低NOx排放标准的紧凑耦合SCR系统控制策略研究*

doi:10.19562/j.chinasae.qcgc.2020.12.004

Abstract

Abstract: Close-coupled selective catalytic reduction (ccSCR) technology is a feasible post-processing technology to meet California’s ultra-low NO_x emission standard. In this paper, the control strategy of 　ccSCR　 system is studied by numerical simulation. SCR single state model is used to predict NH₃ storage, NO_x emission and NH₃ leakage. The NO_x emission characteristics of federal test procedure (FTP) are analyzed when ccSCR catalyst is not installed. Based on the analysis, the dual-nozzle independent control strategy and dual-nozzle joint control strategy are proposed. The results show that ccSCR system can make full use of exhaust gas heat and greatly reduce the starting time of urea injection, with the starting time of urea injection reduced to 51 from 568 s on cold-start FTP. The dual-nozzle joint control strategy will jointly control the NH₃ storage in the ccSCR and the downstream SCR catalyst. The NO_x conversion efficiency of the ccSCR system can reach 99.56% by using this strategy, and the specific NO_x emission meets the requirements of the future California ultra-low NO_x emission standard

Key words: heavy-duty diesel engine, ultra-low NO_x emission, close-coupled selective catalytic reduction, dual-nozzle system, control strategy

Liu Shiyu, Wang Guoyang, Tan Zhi, Zhang Zhaohuan, Shuai Shijin, Wang Zhiming. Study on Control Strategy of CCSCR System to Meet Ultra-low NO_x　Emission Standard[J].Automotive Engineering, 2020, 42(12): 1630-1637.

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Study on Control Strategy of CCSCR System to Meet Ultra-low NO_x　Emission Standard

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Study on Control Strategy of CCSCR System to Meet Ultra-low NOx Emission Standard

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Study on Control Strategy of CCSCR System to Meet Ultra-low NO_x　Emission Standard