CaO高温脱硫过程数值计算

该文采用一种全新的CaO颗粒数学模型对高温条件下CaO颗粒的脱硫过程进行数值模拟。该模型采用随机漫步方法所生成的三维立方体结构的数学模型。根据高温下CaO吸收SO2生成CaSO4的反应分为表面化学反应阶段和以离子扩散为主的产物层扩散控制阶段的原理，将气体分子运动论理论用于孔隙数学模型，对3种具有近似孔隙率和内表面积却具有不同孔隙分形维数的CaO颗粒模型的高温脱硫过程进行数值模拟。数值模拟的计算结果能够定性地反映CaO高温脱硫的过程，其结果同现有的文献报道符合得比较好。

NUMERICAL SIMULATION OF DESULFURIZATION PROCESS WITH CAO AT HIGH TEMPERATURE

Desulfurization process of a single CaO particle at high temperature had been calculated using a new type of three-dimensional math mode, which generated with the method of random walk. There are two stages in the overall CaO sulfation process: The initial stages of sulfation are chemical reaction control regime, and the second stages reaction proceeds under the product-layer-diffusion control regime. Using the basic principle of the kinetic theory of gases, three math models with similar porosity and specific surface area, but different fractal dimension were used in numerical simulation of desulfurization process with CaO at high temperature. The result of numerical simulation could reflect qualitatively the desulfurization reaction progress, and a good agreement between the computational results and the available published data was achieved.