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The effect of carbon dioxide during the desulfurization of flue gas with Mardin-Mazidagi phosphate rock

机译：Mardin-Mazidagi磷酸盐岩对烟气脱硫过程中二氧化碳的影响

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摘要

The effects of temperature, CO_2 concentration and particle size on simultaneous calcination/sulfation of Mardin-Mazidagi phosphate rock in fluidized-bed reactor were investigated. For this, a raw sample was exposed to calcination and sulfation processes in a fluidized-bed reactor to determine the effects of parameters by using a model gas mixture similar to the flue gas composition. The calcination ratio increased with increasing temperature and decreasing particle size, but decreased with increasing CO_2 concentration. In sulfation process, however, sulphate conversion ratio increased with increasing CO_2 ratio and decreased with decreasing particle size. The sulfation reaction is well represented by the shrinking core model and can be divided into two regions with different rate controlling step. For low conversions, the controlling step was found to be chemical reaction at the interface, but the diffusion through the product layer for high conversion. The activation energies for the chemical reaction at the interface and diffusion through the product layer cases were calculated as 100 and 296 kJ mol~(-1) respectively.
机译：研究了温度，CO_2浓度和粒径对流化床反应器中Mardin-Mazidagi磷酸盐岩同时煅烧/硫酸化的影响。为此，将原始样品在流化床反应器中进行煅烧和硫酸化处理，以通过使用类似于烟气成分的模型气体混合物来确定参数的影响。煅烧率随温度升高和粒度减小而增加，但随CO_2浓度增加而降低。然而，在硫酸盐化过程中，硫酸盐转化率随CO_2比的增加而增加，而随粒径的减小而降低。收缩核心模型很好地代表了硫酸化反应，可以将其分为两个具有不同速率控制步骤的区域。对于低转化率，发现控制步骤是在界面处的化学反应，但是通过产物层的扩散实现了高转化率。界面处的化学反应的活化能和通过产物层箱体扩散的活化能分别计算为100和296 kJ mol〜（-1）。

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