【作者】 吉云；

【导师】 陈鸿伟； 李永华；

【作者基本信息】 华北电力大学（河北） ， 热能工程， 2005， 硕士

【摘要】 结合石灰石分解的动力学特性、晶体的烧结模型,建立石灰石同时煅烧和烧结模型,分析各种控速因素,对分解产物的孔隙结构参数进行研究。另外,在此基础上结合石灰石分解过程中CaO 晶体的成核机理和孔隙生成机理,采用Monte-Carlo 方法,对脱硫剂不同分解条件、不同煅烧时刻分解产物孔隙空间网络进行模拟构造,用图像直观描述其微观结构,显现脱硫剂煅烧过程中孔结构的变化情况,并对其进行分形分析。以石灰石煅烧过程中形成的孔隙结构的孔隙率和比表面积为参数,提出煅烧过程中的孔隙分布模型和孔长度分布模型,对脱硫剂煅烧过程中的孔隙分布进行分析研究。研究分析表明:所提出的模型能很好地吻合实验结果,这些方面的研究对于探讨脱硫剂脱硫机理和高温烧结机理具有重要的理论参考价值。更多还原

【Abstract】 Based on the decomposition dynamics and sintering mechanism, a computation model simulating the decomposition of calcium carbonate and predicting the porosity and specific surface areas of product CaO is presented. Meanwhile,based on the theory of solid nucleation and pore formation and the above-mentioned decomposition model, a pore network formation model of CaO samples is also proposed by using a new discrete lattice and the Monte-Carlo method. The model can describe the micro-pore structure of CaO samples during the course of calcination, which is not yet found in published work. On the other hand, it is supposed that the pore size distribution is continuous and pore length changes with pore size. With the known porosity and specific surface areas during the calcination processing, a model describing the pore distribution is proposed. The specific surface areas and distribution density inside porous CaO examples are calculated using the models. The results are of agreement with the experimental datum. And these study have an important theory reference meanings on the desulfurizion and sintering mechanics of sorbents.更多还原