氧化铁高温煤气脱硫剂固定床再生动力学

Regeneration Kinetics of Iron Oxide High Temperature Coal Gas Desulfurization Sorbent in a Fixed Bed Reactor

氧化铁因其硫容大、效率高、机械强度大等特性,已成为极具潜力的可再生高温煤气脱硫剂。以固定床反应器为实验装置,研究了氧气体积分数、再生温度对氧化铁高温煤气脱硫剂再生行为的影响规律。结果表明,等效粒子模型可以很好地拟合氧化铁高温煤气脱硫剂再生动力学实验数据;依据等效粒子模型并结合脱硫剂物性参数获得了氧化铁高温煤气脱硫剂再生动力学模型参数和再生动力学方程。通过比较氧化铁高温煤气脱硫剂再生过程中两个反应阶段的速率,指出内扩散过程为氧化铁高温煤气脱硫剂再生过程实现完全再生的主要控制步骤。

Iron oxide with large sulfur capacity,high efficiency and mechanic strength has been regarded as a promising desulfurization sorbent to remove hydrogen sulfide from high temperature coal gas.The effects of O2 concentration and regeneration temperature on the regeneration behavior of iron oxide desulfurization sorbent were investigated with a fixed bed reactor.The results show that the experimental data of regeneration kinetics for iron oxide desulfurization sorbent can be well fitted by the equivalent particle model.The model parameters and equation of regeneration kinetics for iron oxide desulfurization sorbent were obtained by combining equivalent particle model with physical parameters.A comparison of two-stage reaction rate in regeneration process indicates that the diffusion process is main controlling step in regeneration process for iron oxide desulfurization sorbent.