汽油催化改质反应过程数值模拟

在汽油催化反应动力学模型和气固两相流动模型的基础上，建立了汽油改质反应过程流动-反应耦合模型。针对不同的转化反应器构型（提升管、提升管-床层反应器），对汽油改质过程进行了数值模拟。模拟结果表明，对提升管反应器而言，汽油经过低温改质反应后，烯烃含量可以从35.1%降低到18%左右，烯烃降低幅度可达48%，汽油中烯烃主要转化为异构烷烃。另外，随着反应温度的升高，汽油转化反应中的裂化反应增强，导致汽油收率下降。对于提升管-床层反应器而言，汽油中的烯烃含量可以降得更低，在床层空速4时，烯烃含量可以降低到5%左右，汽油收率为80%左右。

Numerical simulation of FCC gasoline catalytic conversion process

Based on the gas-solid two-phase turbulent model and kinetic model of fluidized catalytic cracking(FCC) gasoline catalytic conversion, a reaction-flow coupled model was built to simulate the FCC gasoline conversion process in the riser and riser-bed reactor respectively.For the riser reactor, the simulation result showed that the mass fraction of olefin decreased from 35.1% to 18%(mass), and most of the olefin was converted to isoparaffin, which was useful to maintain the gasoline octane rating.With increasing reaction temperature, the cracking reaction was enhanced, and the LPG yield dramatically increased when the reaction temperature was above 450℃ at the expense of the gasoline yield.For the riser-bed reactor, the mass fraction of olefin could be reduced to a very low level, 5% olefin when the reaction temperature was 400℃, MHSV was 4, while the gasoline yield was about 80%(mass).