TY - JOUR
T1 - Research on SCR Urea Injection Method of Diesel Engine
AU - Yue, Guang Zhao
AU - Liu, Xing Hua
AU - Sun, Bai Gang
AU - Qiu, Tao
AU - Yao, Xiao Gang
N1 - Publisher Copyright:
© 2018, Editorial Department of Transaction of Beijing Institute of Technology. All right reserved.
PY - 2018/2/1
Y1 - 2018/2/1
N2 - The characteristics of urea injection and NOx conversion efficiency are closely related. A SCR test bench was built based on V2O5-WO3/TiO2 catalyst, and NO, NH3 and O2 feed streams were dosed by mass flow controllers. The effect of normalized stoichiometric ratio (NSR) and catalyst temperature on ammonia storage, ammonia slip and NOx conversion efficiency was studied. The results show that the influence of NSR and temperature on ammonia storage, ammonia slip and NOx conversion efficiency is obvious. The time of ammonia storage will be shorten with the increase of NSR, then the improving speed of NOx conversion efficiency is high. The NSR fix 2.2, the NOx reduction efficiency increase from 0 to 4.3% within 15 s, and the NOx reduction efficiency increase from 0 to 8.7% within 15 s when NSR set 3.0. The time of ammonia slip and ammonia storage are closely related, the time of ammonia slip will be shorten with the increase of NSR. The method of NSR from larger to the smaller can increase ammonia storage rate and optimize NOx conversion efficiency. Using this injection method to carry out the European transient cycle(ETC) test, the brake specific emission of NOx reduce from 8.26 g/(kW·h) to 1.91 g/(kW·h), and the average and peak value of ammonia are 5×10-6 and 18×10-6, the NOx can reach the National V emission regulations.
AB - The characteristics of urea injection and NOx conversion efficiency are closely related. A SCR test bench was built based on V2O5-WO3/TiO2 catalyst, and NO, NH3 and O2 feed streams were dosed by mass flow controllers. The effect of normalized stoichiometric ratio (NSR) and catalyst temperature on ammonia storage, ammonia slip and NOx conversion efficiency was studied. The results show that the influence of NSR and temperature on ammonia storage, ammonia slip and NOx conversion efficiency is obvious. The time of ammonia storage will be shorten with the increase of NSR, then the improving speed of NOx conversion efficiency is high. The NSR fix 2.2, the NOx reduction efficiency increase from 0 to 4.3% within 15 s, and the NOx reduction efficiency increase from 0 to 8.7% within 15 s when NSR set 3.0. The time of ammonia slip and ammonia storage are closely related, the time of ammonia slip will be shorten with the increase of NSR. The method of NSR from larger to the smaller can increase ammonia storage rate and optimize NOx conversion efficiency. Using this injection method to carry out the European transient cycle(ETC) test, the brake specific emission of NOx reduce from 8.26 g/(kW·h) to 1.91 g/(kW·h), and the average and peak value of ammonia are 5×10-6 and 18×10-6, the NOx can reach the National V emission regulations.
KW - Diesel engine
KW - NO conversion efficiency
KW - Selective catalytic reduction(SCR)
KW - Urea injection method
UR - http://www.scopus.com/inward/record.url?scp=85047833340&partnerID=8YFLogxK
U2 - 10.15918/j.tbit1001-0645.2018.02.006
DO - 10.15918/j.tbit1001-0645.2018.02.006
M3 - Article
AN - SCOPUS:85047833340
SN - 1001-0645
VL - 38
SP - 143
EP - 149
JO - Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology
JF - Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology
IS - 2
ER -