石灰石颗粒在高温气流中热解脱硫过程的研究

Research on Calcination and Desulfurization with Limestone Injection into the Furnace

针对喷钙脱硫技术重新受到重视以及对实际条件下石灰石颗粒的反应机理及理论模型缺乏深入研究的状况，该文选取喷钙脱硫实际环境中的石灰石颗粒为对象，研究了石灰石颗粒的快速传热过程以及热解与脱硫反应的反应机理。基于随机孔分布原理提出了全新的热解与脱硫独立反应模型，并首次把热解和脱硫作为不可分离的统一过程建立了完整的耦合模型。在一维沉降炉上做了喷粉热解与脱硫试验，并把研究模型应用于一维沉降炉系统，开发了２套程序用于热解与脱硫过程的数值计算。模型数值计算结果与实验数据吻合良好。

AbstractThis paper studies the mechanism of calcination and desulfurization of limestone particle in actual atmosphere of desulfurization process, which is not studied deeply before although the technique of desulfurization with limestone injection into the furnace is paid more attention. The transient heat transfer of particles is also studied here. Base on the random pore theory, a completely new model for calcination and desulfurization reactions is developed. In the model calcination and desulfurization are considered as two unseparatable processes for the first time. The experimetns on calcination and desulfurization of finer limestone particles were conducted on a one dimensional drop tube furnace system. The model used for the system and two general programs, are developed for the calcination and desulfurization processes. The model prediction has a good agreement with the experimental results.