Abstract
Low-low temperature flue gas system which also called MHI high efficiency system developed by Mitsubishi Corporation has gained comprehensive attention in Japan, European countries and American. However, the applications of this system in China are facing several sever problems about corrosion and ash fouling. This paper focuses on the adsorption characteristics of sulfuric acid mist on fly ash during the flue gas cooling process in the exchanger before the electrostatic precipitator. The experimental results indicate that there is an optimum adsorption temperature for the adsorption of sulfuric acid mist, and this temperature is about 30 ℃ lower than the acid dew point. The process of adsorption is mainly dominated by chemical reactions rather than physical reactions, and the alkali metals (Na, K) and alkaline earth metals (Mg, Ca) are the main factors which influence the chemical reaction rate, especially the Na element. Besides, with the D/S increasing, the adsorption efficiency increases and it is independent of the adsorption temperature. Ash particle size also has large influence on the adsorption efficiency, the smaller the particle size is, the larger the adsorption efficiency is. And when the flue gas speed rose, gas residence time correspondingly reduced and the adsorption efficiency dropped. However, since gas residence time is short in engineering applications, the influence of gas residence time is quite moderate. Furthermore, the adsorption of the sulfuric acid mist will cause a significant agglomeration between ash particles, and it has great significance to the removal of PM.
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