二氯乙烷裂解管式反应器二维模拟

建立了二氯乙烷在管式反应器中进行气相热裂解的二维模型 ,模型考虑了二氯乙烷热解生成氯乙烯的主反应和生成焦前体的副反应以及气体密度变化对裂解反应的影响 .模拟计算表明 ,二氯乙烷和氯乙烯的浓度沿径向分布平坦 ;但是管内近壁面处由于存在边界层 ,始终存在着明显的径向温差 ;近管壁处始终是裂解的高速率区 ,副反应也主要发生在管壁区 .表明确定最优的炉管管径时必须考虑提高裂解速率与降低结焦速率之间的平衡 .在距进口量纲 1管程 0 .3左右的管壁处裂解速率达到最高 ;副反应速率的最大点位于出口管壁处 .与工业数据比较后发现 ,炉管出口的转化率、选择性、出口压力和温度等数据与模型预测值一致 ,表明模型具有较高的可信度

TWO - DIMENSIONAL MODELING OF 1,2 - DICHLOROETHANE CRACKING TUBULAR REACTOR

A two-dimensional model is proposed for simulation of gas phase cracking of 1,2- dichloroethane (EDC) to produce vinyl chloride monomer(VCM) in tubular reactor furnace,in which side reaction of coke precursor formation is taken into consideration.It is found that significant radial variations of cracking temperature and cracking reaction rate exist due to boundary layer near the inner wall.The EDC cracking reaction rate is higher in the wall zone and reaches a maximum at 0.3 of dimensionless length of reactor coil.The rate of coke precursor formation is also higher near the inner wall than in the core zone of reactor coil and reaches a maximum at the outlet of reactor.The model can satisfactorily predict commercial operation results with regard to the EDC conversion,VCM selectivity,pressure and temperature at the outlet of reactor coil.