氧化锌脱除H2S穿透时间的理论预测和实验研究

Theoretical Prediction and Experimental Measurement for Breakthrough Time of Removing H_2S by Zinc Oxide

固定床氧化锌脱硫是目前燃料电池重整系统普遍采用的脱硫工艺。针对氧化锌脱除H2S的固定床反应体系,采用微分方程递推的方法建立脱硫反应的数学模型,计算了不同反应温度、空速条件下固定床脱硫反应器的穿透时间,并用穿透法测定的实验结果对该模型进行验证。研究结果表明,理论模型预测的穿透时间与实验研究结果规律一致,特别是在低空速、高温反应条件下的二者吻合良好。研究还证实了在适当的温度空速范围内,提高温度、降低空速对提高脱硫剂的硫容有利。本研究可为脱硫反应器设计和最优化操作提供参考依据。

Desulfurization in a zinc oxide fixed bed is a widely used technique for the removal of H2S in application for fuel cells. A mathematical model with differential equations was developed in this paper based on the element balance and the shrinking core model to predict the breakthrough time of desulfurization under different temperatures and space velocities. In order to check the accuracy of calculation, the predicted breakthrough times were compared with the experimental data. The results showed that the breakthrough times predicted by the theoretical model were in a reasonable agreement with the experimental data. It is also suggested that lower temperature and higher space velocity are beneficial to enhance the sulfur capacity of the desulfurizer. This theoretical calculation provides a reliable basis for the desulfurization reactor design and optimization.