Study On The Fluorine Removal Mechanics Of Organic-Calcium During Coal Combustion

Fluoride is the main contamination causing air pollution, and the releasing of fluoride during coal combustion is the main source of pollution. There are many studies on the Fluorine Removal Efficiency in Coal Combustion all over the world, but the main additives for fluoride fixed are mineral material, industrial waste and so on. These additives have many advantages. For example, the price is low and the resource is abundant, so they have been extensively used. But the efficiency of fluoride fixed is strongly limited at high temperature in furnaces. Facing these problems, using calcium magnesium acetate (CMA), calcium acetate(CA) and calcium propionate(CP) as fluoride fixed additives during coal combustion is proposed to reach high efficiency. In this paper, analyses of theories and tests were reported.The paper first introduces the actuality of fluoride pollution and its reason in China. Meanwhile, it summarizes the condition of fluoride fixed in the world. Then, combined with the controlling criterion on the releasing of contamination, we offer the intention, content and meaning of the research.Secondly, the paper presents the flow of producing Organic-Calcium and the physical character. We also analyse the micromechanism of them and give a theoretical interpretation on it.Thirdly, on the basis of Thermal Gravimetric experiment, we calculate the characteristics of Thermolytic Kinetics of Organic-Calcium for several models, which gives proof for Organic-Calcium' advantage on fluoride fixed.Then, the effectiveness of calcium magnesium acetate (CMA), calcium acetate(CA) and calcium propionate(CP) as feasible HF capture have been studied by means of fixed bed tube furnaces.At last, we use Factsage, a calculation sofeware about thermodynamics, to calculate the competition between sulfur and fluoride during coal combustion and gain some disciplinarian about it.