王龙,刘永峰,毕贵军,刘海峰,宋金瓯,何旭.柴油表征燃料在高浓度CO2氛围下燃烧机理的分析[J].环境科学学报,2021,41(11):4477-4488
柴油表征燃料在高浓度CO2氛围下燃烧机理的分析
- Analysis of the combustion mechanism of diesel surrogate fuel under high-CO2 atmosphere
- 基金项目：北京市自然科学基金（No.3192011）；国家自然科学基金（No.51976007）；北京建筑大学研究生创新项目（No.PG2021091）
- 王龙
- 北京建筑大学, 机电与车辆工程学院, 北京 102616
- 刘永峰
- 北京建筑大学, 机电与车辆工程学院, 北京 102616
- 毕贵军
- 新加坡科技研究局, 制造技术研究院, 新加坡 637662
- 刘海峰
- 天津大学, 内燃机燃烧学国家重点实验室, 天津 300072
- 宋金瓯
- 天津大学, 内燃机燃烧学国家重点实验室, 天津 300072
- 何旭
- 北京理工大学, 机械与车辆学院, 北京 100081
- 摘要：为研究高浓度CO2在高温高压情况下对柴油燃烧特性的影响，提出了柴油表征燃料在CO2/O2氛围下的燃烧反应机理.通过量子化学计算了化学反应路径并对反应路径进行分析，最后进行柴油表征燃料燃烧的仿真.通过搭建定容燃烧弹试验台架和可视化系统进行试验与仿真分析，结果表明：在50% CO2+50% O2氛围下，对仿真与实验的火焰燃烧极限长度和火焰纵截面面积进行对比，最小误差分别为0.39%和0.64%，最大误差分别为8.54%和4.94%，说明此机理适用于高浓度CO2氛围下柴油燃烧特性的研究；CO2的化学效应在柴油表征燃料燃烧时具有促进作用，CO2在2600 K时发生热解，热解产物CO与H自由基等发生反应可以生成着火促进剂·OH；柴油在50% CO2+50% O2、43% CO2+57% O2和35% CO2+65% O2氛围下的燃烧效率比空气氛围分别提高了28.2%、30.4%和33.3%.
- Abstract：In order to study the effect of high concentration of CO2 on the combustion characteristics of diesel under high temperature and high pressure, a combustion reaction mechanism of diesel fuel under CO2/O2 atmosphere is proposed. The chemical reaction paths are calculated and analyzed by quantum chemistry, and simulation of diesel fuel combustion is performed. Finally, a constant volume combustion test chamber is built and visualized. The experimental and simulation results show that in 50% CO2 and 50% O2 atmosphere, the minimum errors between the simulation and experimental results for the flame combustion maximum length and area of the flame longitudinal section are 0.39% and 0.64%, and maximum errors are 8.54% and 4.94%, respectively. It indicates that the proposed mechanism is suitable for the study of diesel combustion characteristics in a high-concentration CO2 atmosphere. The chemical effect of CO2 can promote the combustion of diesel fuel. CO2 will undergo pyrolysis at 2600 K. The pyrolysis product CO can react with H free radicals to generate ignition promoter·OH. The combustion efficiency of diesel under 50% CO2+50% O2, 43% CO2+57% O2 and 35% CO2+65% O2 atmosphere is 28.2%, 30.4% and 33.3% higher than that of air atmosphere, respectively.
