二氧化硫强制动态氧化过程的模型化(Ⅱ)——模型模拟与参数分析

MODELING OF UNSTEADY-STATE OXIDATION PROCESS OF SO_2 (Ⅱ) MODEL SIMULATION AND PARAMETER ANALYSIS

建立了充填国产S101钒催化剂的、单段流向变换周期操作固定床反应器的非均相动态模型。藉助模型所做的数值分析,证实了低浓度SO_2自热氧化的可行性,研究了参数对反应器性能的影响,证明存在着适宜的气速。计算结果还表明,转化率等性能指标对原料气浓度、流量的变化较敏感,对于气源浓度、流量可能大幅度变化的情况,在设计时必需采取相应的措施。

The heterogeneous transient model of a fixed - bed reactor packed with vanadium catalyst, S101, for catalytic oxidation of SO2 and operating in a flow direction switched periodically was developed. Computation results showed that autothermal oxidation of low concentration SO2 is feasible. The effects of important parameters on the performances of the reactor operating in this mode were numerically studied. It is noticed that time averaged conversion and temperature at the hot - spot are rather sensitive to the variation of the composition and flow rate of feed. This qualitative conclusion should be considered in the design of a commercial reactor in order to keep stable operation.