不同裂解条件对甲醇-柴油高温裂解产物的影响研究

采用石英管式流动反应器试验装置,配置不同体积掺混比(M0,M5,M10,M15)的甲醇-柴油混合燃料作为试验燃料,采集了混合燃料在不同裂解温度和甲醇掺混比下的裂解产物。应用气相色谱质谱联用仪GC-MS,对不同裂解条件下12种烃类产物的摩尔分数变化规律进行了研究;采用微克天平和扫描电镜SEM,对甲醇-柴油混合燃料裂解生成的炭烟产率及形貌特征的变化规律进行了研究。结果表明:裂解过程中,裂解温度高于973 K时,烷烃和芳香烃的摩尔分数变化率降低,芳香烃的摩尔分数增加,相比于923 K,裂解温度为973 K,1023 K和1073 K时,炭烟产率分别增加了1.7倍、5.1倍和11.6倍;甲醇掺混比增加,烃类物质摩尔分数和炭烟产率降低;裂解温度增加,炭烟的平均粒径降低,乙烷、丙烷、丁烷及丙烯、丁烯、丁二烯的浓度降低;甲醇掺混比增加,炭烟的平均粒径降低,乙烯的摩尔分数增加。

Effect of Different Pyrolysis Conditions on Methanol-Diesel Pyrolysis Product

Different methanol and diesel blends were prepared by mixing methanol at volume ratios of M0,M5 and M10 on the quartz tube flow reactor.The pyrolysis products of blends were collected at different pyrolysis temperatures and methanol mixing ratios.Under different pyrolysis conditions,the variation laws of molar concentration for 12 kinds of hydrocarbon products were studied by gas chromatography-mass spectrometry,and the variation laws of soot yield and morphology were studied by using microgram balance and SEM.The results show that the change rate for the molar concentration of alkanes and aromatics decreases and the molar concentration of aromatics increases when the pyrolysis temperature is beyond 973 K.Compared with 923 K,the soot yield increases by 1.7,5.1 and 11.6 times respectively at 973 K,1023 K and 1073 K.With the increase of methanol mixing ratio,the molar concentration of hydrocarbons and soot yield decrease,the average particle size of soot decreases and the molar concentration of ethylene increases.With the increase of pyrolysis temperature,the average particle size of soot decreases and the concentrations of ethane,propane,butane,propylene,butane and butadiene decrease.