VGT与米勒循环对生物柴油排放的优化
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摘要
为了降低生物柴油在低速时NOx排放的同时不引起其他性能的恶化,我们以4JB1型柴油机为对象建立一维仿真模#型,将可变截面涡轮增压器和米勒循环相结合,对体积比为30%的地沟油生物柴油0柴油混合燃料在低转速下的排放进行优化并提出控制策略。结果表明:100%负荷下利用遗传算法对NOx、Soot排放和BSFC分别进行单目标优化后分别降低了28.34%、84.89%和1.15%。通过双目标优化的Pareto解集发现,BSFC和NOx比排放更容易同时实现优化。最后经过多目标优化,在100%和50%负荷时,米勒度分别为M98和M85,VGT阀门开度分别为0.25和0.16时目标函数达到最小,NOx分别比优化前降低了23.17%和8.2%,虽然Soot排放有所上升,但与燃用纯柴油的Soot排放相当。
In order to reduce biodiesel's NOx emission not causing the deterioration of other performance in low speed, 4 JB1 diesel engine was used as research object in this paper, VGT and Miller cycle were combined to discharge the emission of the 0# diesel mixed with the volume ratio of 30% of the gutter oil at low speed. The control strategy is optimized and proposed. the single objective optimization of NOx, Soot emission and BSFC under 100% load is reduced by 28.34%, 84.89% and 1.15% respectively. It is found that BSFC and NOx are easier to achieve simultaneous optimization than emissions by Pareto decomposition of two-objective optimization. At the end of the multi-objective optimization, the Miller degree is M98 and M85 at 100% and 50%, the target function of the VGT valve opening is 0.25 and 0.16 respectively, and the NOx is reduced by 23.17% and 8.2% before the optimization, although the Soot emission increases, but it is equivalent to the Soot discharge from the pure diesel.
In order to reduce biodiesel's NOx emission not causing the deterioration of other performance in low speed, 4 JB1 diesel engine was used as research object in this paper, VGT and Miller cycle were combined to discharge the emission of the 0# diesel mixed with the volume ratio of 30% of the gutter oil at low speed. The control strategy is optimized and proposed. the single objective optimization of NOx, Soot emission and BSFC under 100% load is reduced by 28.34%, 84.89% and 1.15% respectively. It is found that BSFC and NOx are easier to achieve simultaneous optimization than emissions by Pareto decomposition of two-objective optimization. At the end of the multi-objective optimization, the Miller degree is M98 and M85 at 100% and 50%, the target function of the VGT valve opening is 0.25 and 0.16 respectively, and the NOx is reduced by 23.17% and 8.2% before the optimization, although the Soot emission increases, but it is equivalent to the Soot discharge from the pure diesel.
引文
[1]Stavinoha L L,Alfaro E S,Dobbs H H,et al.Alternative Fuels:Development of a Biodiesel B20 Purchase Description[J].2000.
[2]Cui Y,Deng K.Thermodynamic model and optimization of a miller cycle applied on a turbocharged diesel engine[J].Journal of Thermal Science&Technology,2014.
[3]楼狄明,郭石磊,谭丕强,等.可变截面涡轮增压器与废气再循环[J].同济大学学报:自然科学版,2015,44(12):1931-1937.
[4]GT-Power User′s Manual and Tutorial.Gala Technologies,March 2003.
[5]郭天文.基于DOE的柴油机喷油规律和EGR耦合优化研究[D].四川:西南交通大学,2016.
[6]刘德辉,石柏军,章雪华.基于GT-Power的柴油机进排气系统多目标优化[J].重庆理工大学学报,2016,30(7):30-37.
[7]蔡俊俊.Miller循环煤层气发动机的仿真优化研究[D].四川:西南交通大学,2017.
[8]王重,刘黎明.拟合优度检验统计量的设定方法[J].统计与决策,2010,(5):154-156.
[9]Gujarati Damodar,费剑平,孙春霞,等.计量经济学基础[M].中国人民大学出版社,2005.
[10]潘峰.粒子群优化算法与多目标优化[M].北京:北京理工大学出版社,2013.
[2]Cui Y,Deng K.Thermodynamic model and optimization of a miller cycle applied on a turbocharged diesel engine[J].Journal of Thermal Science&Technology,2014.
[3]楼狄明,郭石磊,谭丕强,等.可变截面涡轮增压器与废气再循环[J].同济大学学报:自然科学版,2015,44(12):1931-1937.
[4]GT-Power User′s Manual and Tutorial.Gala Technologies,March 2003.
[5]郭天文.基于DOE的柴油机喷油规律和EGR耦合优化研究[D].四川:西南交通大学,2016.
[6]刘德辉,石柏军,章雪华.基于GT-Power的柴油机进排气系统多目标优化[J].重庆理工大学学报,2016,30(7):30-37.
[7]蔡俊俊.Miller循环煤层气发动机的仿真优化研究[D].四川:西南交通大学,2017.
[8]王重,刘黎明.拟合优度检验统计量的设定方法[J].统计与决策,2010,(5):154-156.
[9]Gujarati Damodar,费剑平,孙春霞,等.计量经济学基础[M].中国人民大学出版社,2005.
[10]潘峰.粒子群优化算法与多目标优化[M].北京:北京理工大学出版社,2013.