喷油参数对生物柴油-柴油混合燃料燃烧和排放特性的影响

季宏¹，王传厚²，孟繁衍¹，王保力¹，徐文珂¹，孟建^1*

1.山东理工大学交通与车辆工程学院，山东 淄博  255049；

2.山东泰开汽车制造有限公司，山东 泰安  271000

摘要：为了研究低负荷下喷油压力和喷油时刻对餐余废油生物柴油混合燃料的燃烧、排放特性的影响，制备餐余废油生物柴油-柴油混合燃料(混合燃料中生物柴油体积分数为30%,记为B30)，在一台高压共轨四缸柴油机上进行纯柴油和B30的对比试验。试验结果表明：在最大转矩转速为1540 r/min、25%负荷工况，喷油压力和喷油时刻相同时，相比于纯柴油，B30燃烧时最大缸压和放热率峰值分别下降了0.67%和0.92%，且放热率峰值后移，B30的CO、THC、Soot、NO₂、CH₄、C₂H₄和CH₂O排放略微降低，NO_x排放增加；随着喷油压力增加和喷油时刻提前，B30的燃烧得到改善，最大缸压和放热率峰值均增大且前移，CO、THC、Soot、NO₂、CH₄、C₂H₄和CH₂O排放大幅度降低，NO_x排放增加。

关键词：餐余废油；燃烧；排放；喷油压力；喷油时刻

Effect of fuel injection parameters on the combustion and emission characteristics of biodiesel-diesel blend

JI Hong¹, WANG Chuanhou², MENG Fanyan¹, WANG Baoli¹, XU Wenke¹, MENG Jian¹

1. School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo 255049, China;

2. Shandong Taikai Automobile Manufacturing Co., Ltd., Taian 271000, China

Abstract：In order to study the influence of injection pressure and injection time on the combustion and emission characteristics of waste meal biodiesel blend fuel under low load, a biodiesel-diesel blend fuel (the volume fraction of waste meal biodiesel is 30%, named as B30) is prepared, and a comparison test between pure diesel and B30 is conducted on a high-pressure common rail four cylinder diesel engine. The test results show that when the maximum torque speed is 1540 r/min and the load is 25%, and the injection pressure and injection time conditions are the same, compared with pure diesel, the maximum cylinder pressure and the peak heat release rate of B30 combustion decrease by 0.67% and 0.92% respectively and move backward. Compared with pure diesel, the emissions of CO, THC, Soot, NO₂, CH4, C₂H₄ and CH₂O of B30 mixed fuel are slightly reduced, while NOx emissions are increased. With the increase of injection pressure and the advance of injection time, the combustion of B30 is improved, the peak values of maximum cylinder pressure and heat release rate both increase and move forward, the emissions of CO, THC, Soot, NO₂, CH₄, C₂H₄ and CH₂O are significantly reduced, and NOx emissions are increased.

Keywords:waste cooking biodiesel; combustion; emission; injection pressure; injection time