CDPF主动再生对SCR性能影响的试验研究

doi:10.19562/j.chinasae.qcgc.2022.08.017

Abstract

Abstract:

Based on the National 6 small-bore diesel engine loaded with a DOC+ CDPF+ SCR after-treatment test bench， the CDPF active regeneration and drop to idle（DTI） regeneration tests are carried out under the carbon load of 8 g/L， and the effect of CDPF active regeneration on operating characteristics of SCR coated with different catalysts is studied and analyzed. The results show that due to the action of the mixer， the active regeneration of CDPF has little influence on the uniformity of the temperature distribution at the inlet surface of the SCR， and the average inlet temperature of the SCR during the active regeneration is about 580 ℃. During the stabilization period of active regeneration， the NO _x conversion efficiency is lower for both the two catalyst coating schemes， with the NO _x conversion efficiency of Cu-zeolite SCR about 80.3%， and that of vanadia-based SCR about 32%. The stability of Cu-zeolite catalyst is relatively high. During the DTI active regeneration test， before the active regeneration， the NO _x conversion efficiency gradually increases with the increase of the SCR inlet temperature. When the inlet temperature is 401 ℃， the NO _x conversion efficiency reaches the highest value during this period， and its value is about 99.3%. After the active regeneration is stabilized， the NO _x conversion efficiency decreases with the increase of temperature. When the working condition suddenly changes to the idle condition， the SCR inlet temperature reaches the highest value， which is about 582 ℃， and the conversion efficiency is 82.2%. At the same time， the oxygen concentration increases， resulting in the NO _x conversion efficiency rising rapidly to the peak and then remaining stable， and the conversion efficiency is stabilized at 99.5%， which begins to decline when the temperature decreases.

Key words: diesel engine, CDPF active regeneration, SCR, NO _x conversion efficiency

Yinggang Shen,Weijie Shi,Huanrong Xiao,Ruimin Yang,Guisheng Chen,Kegang Bi. Experimental Research on the Effect of Catalyzed Diesel Particulate Filter Active Regeneration on Selective Catalytic Reduction Performance[J].Automotive Engineering, 2022, 44(8): 1280-1288.

Figures/Tables 19

References 16

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参数	数值
发动机型式	直列4缸、增压中冷
燃油喷射系统	电控共轨系统
缸径/mm	95
行程/mm	105
排量/L	3
压缩比	16.6
额定功率/kW	125（2 800 r/min）
最大转矩/（N·m）	500（1 200~2 200 r/min）
最低燃油消耗率/（g·kW^-1·h^-1）	200
排放标准	国六
后处理路线	DOC+CDPF+SCR+ASC

仪器名称	型号规格	测量精度
进气流量计	HSAE AIR FLOW ZJ85	0.1 kg/h
精密电子称重仪	CHS-D	0.01 g
多路温控记录仪	THW48K	＜0.2%·全量程
NO _x 传感器	UniNOx-Sensor	1×10^-6
温度传感器	PT200温度传感器	1 ℃
压力传感器	1M992-2	0.1 kPa

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Experimental Research on the Effect of Catalyzed Diesel Particulate Filter Active Regeneration on Selective Catalytic Reduction Performance

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