科研之友
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摘要
A high-temperature vertical tube furnace experimental system, capable of real-time monitoring the sample quality, was built in this study. The combustion reactions of pulverized coal and the decomposition reactions of calcium carbonate(CaCO3) can be performed simultaneously, and the mixed reaction characteristics can reflect the real situation in the precalciner. During the operating temperature range of 900-1 000 ℃, the variations in temperature had little effect on the combustion reactions of pulverized coal, but the temperature became an important factor affecting the CaCO3 decomposition at lower temperature. With the mass ratio of CaCO3 in the mixture increasing, the reaction rate was more sensitive to temperature. The BET(Brunauer, Emmett and Teller) specific surface area of decomposition product was largest when the mass ratio of coal to CaCO3 was approximately 1 ∶ 9. The kinetic analysis of the experimental data shows that the reaction kinetics model of the mixture was different in different mass ratios. The activation energy value decreased with the increase in the mass ratio of coal to CaCO3, and so did Arrhenius constant. To ensure the high decomposition ratio of CaCO3 and the high combustion efficiency of coal in the cement precalciner, it is necessary to control the mass ratio of coal to CaCO3 being higher than 1 ∶ 9. The activation energy data obtained from this study can provide support for the later simulation calculation of the precalciner.
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单位高温气体动力学国家重点实验室; 中国科学院大学
