典型烃类分子裂解产物分布数值模拟

Numerical Simulation on Distribution of Products of Typical Hydrocarbon Molecules Pyrolysis

利用烃类蒸汽热裂解二维工艺数学模型,选择二维模型原料分子中13种典型烃类分子,通过数学模拟考察烃类分子结构和裂解温度对热裂解产物的影响。结果表明:正构烷烃裂解产物中乙烯收率明显大于异构烷烃,且乙烯收率随着烷烃碳数的增加逐渐增加;异构烷烃裂解产物中丙烯收率大于同碳数的正构烷烃,且丙烯收率随碳数增大而显著减少;异构烷烃裂解生成丁二烯的收率大于其他烷烃;环烷烃中五元环裂解生成乙烯、丙烯和丁二烯(三烯)的收率大于六元环,且随碳数增加而略有增加;各烃类分子裂解生成乙烯和丁二烯的收率随温度的增加而增加,而丙烯的收率随温度的增加而略有降低。

The effects of hydrocarbon structure and pyrolysis temperature on the distribution of products from the pyrolysis of 13 typical hydrocarbon molecules were investigated using the two-dimension mathematical model of hydrocarbon steam pyrolysis.The results showed that the ethylene yield of normal paraffins pyrolysis was significantly higher than that of isoparaffin pyrolysis,and the ethylene yield increased with the increase of carbon number;the propylene yield of isoparaffin pyrolysis was higher than that of normal paraffins pyrolysis,and the propylene yield decreased obviously with the increase of carbon number;the butadiene yield of isoparaffin pyrolysis was higher than that of other paraffins pyrolysis;the total yield of ethylene,propylene and butadiene from the pyrolysis of cycloalkanes with five carbon in the rings was higher than that of cycloalkanes with six carbons in the rings,and increased slightly with the increase of carbon number;With the increase of pyrolysis temperature,the yield of ethylene and butadiene of hydrocarbons pyrolysis increased,while the yield of propylene decreased slightly.