石灰石／石灰湿法烟气脱硫的脱氟反应

Fluorine removal thermodynamics of limestone / lime wet flue gas desulfurization

CaCO3-HF反应的反应限度、外界条件和物质组成对于脱氟反应的影响进行丁研究。结果表明:随反应温度的升高,ΔrGmθ逐渐增大,Kθ逐渐减少。说明反应温度的升高,不利于正向反应的进行,但在25～200℃范围内,ΔrGmθ<0,Kθ在2．72×1013～2．81×1021之间,数值足够大,反应可自发进行,反应限度很深。

This paper researches on effect factors of fluorine removal such as the reaction limit, the ambient condition and the physical composition. The research result shows that: Standard Gibbs function of reaction per unit molarΔrGmθincreases gradually and reaction equilibrium constant Kθdecreases gradually with rising reaction temperature, respectively, which explains that the rise of reaction temperature is not available for positive reaction, but in 25～200℃,ΔrGmθ< 0,2.72×1013<Kθ< 2.81×1023,the value is so big that the reaction has the spontaneity and deep limit.