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基于硫酸钙程序升温实验计算并得到其煅烧反应速率常数,综合考虑SO2与O2的表面扩散以及煅烧分解产物氧化钙的烧结过程,建立修正的硫酸钙分解未反应缩核模型。结果表明,硫酸钙的高温分解对温度非常敏感,提高SO2和O2的分压/抑制硫酸钙的高温分解。随着分解反应的进行,氧化钙烧结产物层的平均比表面积和平均孔隙率逐渐降低,同时未反应核表面SO2和O2浓度先增大后减小,在高SO2浓度(>1100×10-6)条件下模拟计算结果与实验值吻合良好。
Based on the temperature programmed experiment of calcium sulfate and its calcination reaction rate constant, the surface diffusion of SO2 and O2 and the sintering process of calcium oxide calcined decomposition product were comprehensively considered, and a modified model of unreacted contracting nucleus of calcium sulfate decomposition was established. The results show that pyrolysis of calcium sulfate is very sensitive to temperature, increasing the partial pressure of SO2 and O2 / inhibiting the pyrolysis of calcium sulfate. As the decomposition reaction proceeded, the average specific surface area and average porosity of calcined calcined product layer gradually decreased, while the SO2 and O2 concentrations of non-reacted nuclear surface first increased and then decreased. Under high SO2 concentration (> 1100 × 10-6 ) Simulation results agree well with the experimental data.