半干法循环流化床脱硫反应器内构件研究进展

常规脱硫反应器存在着床内气固流动不均匀、脱硫剂利用效率低等问题。安装内构件可以破碎气泡和颗粒团聚，改善流化质量，强化脱硫反应器内的气固传质和反应过程，提高脱硫效率。本文介绍了近年来半干法循环流化床脱硫反应器内构件的研究现状，主要介绍了惯性式内构件、钝体式内构件、孔板式内构件、复合型内构件；阐述了各种内构件的形式及特点，其中惯性式内构件能够强化气固分离，但不能优化流场；钝体式内构件能够增强反应器内气固湍动程度，但对轴向混合影响不大；孔板式内构件能够均布流场，但易堵塞；复合内构件能够改善流化性能，强化气固接触，但床层压降较高。通过对装有不同内构件的循环流化床脱硫反应器中气固两相流动特点的分析，指明了各类内构件对流化床内气固流动的作用原理及优缺点，综合床层压降及颗粒浓度分布，并根据现有流化床脱硫反应器内构件特点提出了促进气固高效接触、降低床层压降等新型内构件的开发方向。

Studies on internal componnets in semi-dry circulating fluidized bed desulfurization reactor

Traditional desulfurization reactors have disadvantages such as nonuniform flow structure and low desulfurizer utilization efficiency. The internals in CFB（circulating fluidized-bed） have advantages of breaking bubbles and particle aggregation，improving the quality of the fluidization，enhancing the mass transferring and the desulphurization process，resulting in higher desulfurization efficiencies. This paper summarized studies on internal components in semi-dry circulating fluidized bed desulfurization reactors，including inertial separator，bluff-body internals，orifice internals and compound internals，and the forms and the characteristics. The inertial internals can intensify the gas-solid separation but have no influences on optimizing the flow field；the bluff-body internals can enhance the turbulence in the reactor but cannot affect the axial mixing；the orifice internals can make the flow field uniform but have disadvantages of blocking；and the compound internals can improve the fluid properties and strengthen the contact of gas-solid phase but make the pressure drop high. The flow characteristics of both gas and solid in fluidized bed with various internals were illustrated，and the advantages and disadvantages of various types of internals were discussed. Considering the variety features of pressure drop and the particles concentration with different internals，the direction such as promoting the gas-solid contact with high efficiency and reducing the pressure drop of the CFB for future development was discussed.