管式反应器石灰雾液脱硫的数学模拟

Mathematical modeling of SO2 removal with limespraysin atubularre actor

建立的一维管式反应器雾液脱硫模型是对蒸发和吸收过程的耦合，以膜理论为基础的吸收机理同时考虑了含硫组分的离解、扩散、反应和固体颗粒的溶解．参数敏感性分析表明，对系统脱硫率影响最显著的是出口干湿球温差、石灰颗粒粒度和入口ＳＯ２ 浓度．传质过程的分析表明，反应开始阶段液膜扩散和固体溶解阻力均存在，而气膜扩散在整个反应过程中都起着重要作用．与试验值的比较发现，模型预测结果的平均相对偏差约为８ ％ 。

Amodeltosimulatethedesulfurizationofspraysinatubularreactor wasestablishedincombi nation withthe spray evaporation and SO2 absorption.Based on the film theory,theionization,diffusion and reaction ofsulfurconsitituents,andthedissolution oflimeparticulate wereconsideredintegrallyinthe model.Thesensitivity analysis of modelparametersshowed thattheefficiency of SO2 removalin such a system was highly dependentontheapproachtoadiabatictemperatureatexit,thesize ofsuspendedlime particulate andtheSO2concentrationinfluegas.Furthermore,thecalculation of masstransferrevealedthe obviousimportanceofgas film diffusion duringthe wholeprocedure,whiletheresistanceofliquidfilm and lime dissolution emerged only attheinitialstage ofabsorption.The model was proventoagree well with the experimentalresults with an averagerelativeerrorof8% .