轻柴油裂解急冷锅炉的结焦机理及模型

COKING MECHANISM AND MODEL OF TRANSFER LINE EXCHANGER FOR QUENCHING PYROLYSIS REACTION OF GAS OIL

作者设计和安装了一套研究轻柴油裂解时急冷锅炉结焦的实验装置.实验表明,轻柴油裂解时,TLE结焦机理为传质、冷凝-表面缩聚反应机理.首次证实了在TLE结焦过程中存在着特定的转折温度.当壁面温度高于转折温度时,传质、冷凝过程为结焦过程的控制步骤;反之,表面缩聚反应过程为控制步骤.根据上述TLE结焦机理,建立了TLE结焦模型.并对工业TLE装置进行模拟,模拟结果与工业实测数据吻合较好.

A set of micro-system for investigating coking process in transfer line exchanger (TLE) for quenching pyrolysis reaction of gas oil was designed and assembled by the authors. It was clear from the experiment that the coking mechanism in TLE was mass transfer and condensation-surface poly-condensation reaction. The authors first showed a characteristic transition temperature of coking process in TLE. The mass transfer and condensation process could be the controlling step of coking process when the surface temperature was higher than the transition point, otherwise, surface-polycondensa-tion reaction could be the controlling step. On the basis of the above-mentioned mechanism, the authors proposed a coking model of TLE and simulated the industrial TLE. The agreement between the simulation results and observed industrial data was good.