Research On Calcination Of Calcium-based Sorbents And Their Pore Structure Simulation

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.