|
|
Simulation on NOx emission of SCR system with PODE/methanol blend fuel |
1. School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Wuxi Henghe EP Tech Co., Ltd., Wuxi, Jiangsu 214174, China; 3. State Key Laboratory of Power System of Tractor, Luoyang, Henan 471039, China |
|
|
Abstract To control the NOx 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 NOx emission of PODE/methanol blend fuel was investigated by numerical simulation. The results show that with the increasing of n(NH3)/n(NOx), NH3 distribution uniformity, velocity distribution uniformity and NOx conversion efficiency of SCR system are increased firstly with latter decreasing, while the leakage of NH3 is increased gradually. When the n(NH3)/n(NOx) is 1.3, the γNH3 reaches the highest value of 0.988 with the maximum μν value of 0.983 and the NOx conversion 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 NOx 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.
|
|
|
|
|
[1] |
LIU J, YANG F, WANG H, et al. Effects of pilot fuel quantity on the emissions characteristics of a CNG/diesel dual fuel engine with optimized pilot injection timing [J]. Applied Energy, 2013, 110: 201-206.
|
[2] |
LIU J H, SUN P, HUANG H, et al. Experimental investigation on performance, combustion and emission characteristics of a commonrail diesel engine fueled with polyoxymethylene dimethyl ethersdiesel blends[J]. Applied Energy, 2017, 202: 527-536.
|
[3] |
DURAISAMY G, RANGASAMY M, GOVINDAN N. A comparative study on methanol/diesel and methanol/PODE dual fuel RCCI combustion in an automotive diesel engine[J].Renewable Energy, 2020, 145: 542-556.
|
[4] |
CHAUDHARI V D, DESHMUKH D. Diesel and dieselgasoline fuelled premixed low temperature combustion (LTC) engine mode for clean combustion[J]. Fuel, doi:10.101b/j.fuel.2019.116982.
|
[5] |
OLYMPIOU G G, EFSTATHIOU A M. Industrial NOx control via H2SCR on a novel supportedPt nanocatalyst[J]. Chemical Engineering Journal, 2011, 170(2/3): 424-432.
|
[6] |
杨延相, 张洪涛, 张元清, 等. 道路车用柴油机国六排放选择性催化还原系统的开发与验证[J]. 内燃机工程, 2020, 41(2): 39-45.
|
|
YANG Y X, ZHANG H T, ZHANG Y Q, et al. Development and validation of a selective catalytic reduction system for China Ⅵ regulation compliant onroad diesel engine[J].Chinese Internal Combustion Engine Engineering, 2020, 41(2): 39-45.(in Chinese)
|
[7] |
陈镇, 陆国栋, 赵彦光, 等. 柴油机尿素SCR氨分布均匀性的试验与模拟优化[J].车用发动机, 2012(1): 41-45.
|
|
CHEN Z, LU G D, ZHAO Y G, et al. Experiment and simulation of ammonia distribution uniformity for diesel engine ureaSCR[J].Vehicle Engine, 2012(1): 41-45. (in Chinese)
|
[8] |
刘军恒, 杨军, 周海磊, 等. 聚甲氧基二甲醚甲醇混合燃料的燃烧与排放特性研究[J]. 内燃机工程, 2021, 42(2): 16-22.
|
|
LIU J H, YANG J, ZHOU H L, et al. Investigation on combustion and emission characteristics of polyoxymethylene dimethyl ethersmethanol blends[J].Chinese Internal Combustion Engine Engineering,2021, 42(2): 16-22. (in Chinese)
|
[9] |
马军彦, 李君, 曲大为, 等. 柴油机SCR系统尿素分解效率研究[J].农业机械学报, 2015, 46(6): 282-286.
|
|
MA J Y, LI J, QU D W, et al. Urea decomposition efficiency of diesel engine SCR system[J].Transactions of the Chinese Society for Agricultural, 2015, 46(6): 282-286. (in Chinese)
|
[10\] |
谭理刚, 冯鹏飞, 杨树宝, 等. 基于CFD的 UreaSCR混合器性能研究[J].内燃机工程, 2018, 39(4): 61-66.
|
|
TAN L G, FENG P F, YANG S B, et al. Study on static mixer performance in UreaSCR systems based on CFD code[J].Chinese Internal Combustion Engine Engineering, 2018, 39(4): 61-66. (in Chinese)
|
[11\] |
王奉双, 侯亚玲, 高伟, 等. 国六柴油机用铜基和钒基SCR催化剂特性台架对比研究[J]. 车用发动机, 2020(1): 31-37.
|
|
WANG F S, HOU Y L, GAO W, et al. Comparison between copperbased and vanadiumbased SCR catalyst of China Ⅵ diesel engine based on bench test[J]. Vehicle Engine, 2020 (1): 31-37. (in Chinese)
|
[12\] |
SUNG Y, CHOI M, PARK T, et al. Synergistic effect of mixer and mixing chamber on flow mixing and NOx reduction in a marine ureaSCR system[J]. Chemical Engineering and ProcessingProcess Intensification, 2020, 150: 107888.
|
[13] |
BRNHORST M, DEUTSCHMANNA O. Advances and challenges of ammonia delivery by ureawater sprays in SCR systems[J].Progress in Energy and Combustion Science, 2021, 87: 100949.
|
[14] |
TAN L G, FENG P F, YANG S B, et al. CFD studies on effects of SCR mixers on the performance of urea conversion and mixing of the reducing agent[J].Chemical Engineering & Processing Process Intensification, 2018, 123: 82-88.
|
[15] |
ZHANG C F, SUN C, WU M P, et al. Optimisation design of SCR mixer for improving deposit performance at low temperatures[J].Fuel, 2019, 237: 465-474.
|
[16] |
王谦, 张铎, 王静, 等. 车用柴油机UreaSCR系统数值分析与参数优化[J].内燃机学报, 2013, 31(4): 343-348.
|
|
WANG Q, ZHANG D, WANG J, et al. Numerical analysis and parametric optimization on UreaSCR system of vehicle diesel[J].Transactions of CSICE,2013, 31(4): 343-348.(in Chinese)
|
|
|
|