中文摘要：

以烟气脱硫过程中的质量平衡方程为基础，结合可以描述脱硫剂颗粒反应的收缩未反应核模型（shrinking unreacted core model），同时考虑到再循环物料的影响，建立能够预测循环流化床反应器内烟气脱硫效率的数学模型，该模型可以分别量化新鲜脱硫剂和再循环颗粒的脱硫效率。模型仿真出脱硫效率在不同参数条件下的变化趋势与实际运行情况一致，并且模型经校正后能够比较准确地描述脱硫过程，因此该模型可以用来指导循环流化床烟气脱硫系统的工艺设计和参数优化。

英文摘要：

Based on the mass conservation equations, and combined with shrinking unreacted core model which could describe the chemical reaction of desulfurizing sorbent, a mathematical model was established to predict the desulfnrization efficiency in the circulating fluidized bed with consideration of the impact of recycled particles. The proposed model could calculate the desulfurization efficiencies of both fresh sorbent and recycled particles. A detailed analysis was conducted to investigate the influence of operating parameters on desulfurization efficiency, and the simulation results are agree with available operating conclusions. With proper modification, the model prediction results are in good agreement with the obtained experiment data. Thus, the proposed mathematical model could be successfully used as a tool to analyze the circulating fluidized bed for flue gas desulfurizaiton （CFB-FGD） process and optimize the operating parameters.