Studies On Characteristics Of Desulphurization By Nano-CaCO₃ During Coal Combustion

SO₂ is the main contamination causing air pollution, and the releasing of SO₂ during coal combustion is the main source of pollution. It is very imperative to control the releasing of SO₂ during coal combustion. Although there are many advantages and it has been extensively used, the desulphurization effect of calcium-based sorbent is very limited. So the technique doesn't satisfy the demand for high quality desulphurization. Profit from the development of new material, we adopt nano-CaCO₃ as additive to research its desulphurization effect, which has an important effect on research on desulphurization.The paper first introduces the actuality of SO₂ pollution and its reason in China. Meanwhile, it summarizes the condition of exploiture of desulphurization and the development of CaCO₃. 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 nano-CaCO₃ and methods for measuring main indexes. We also determine some indexes related to desulphurization, and analyze the micromechanism of them. Then, we research the dynamic characteristic of sulfur releasing during coal combustion and the effect of desulphurization by using nano-CaCO₃. What's more, we give a theoretical interpretation on it。Thirdly, on the basis of Thermal Gravimetric experiment, we calculate the characteristics of Thermolytic Kinetics of nano-CaCO₃ for several models, which gives proof for nano-CaCO₃' advantage on thermal decomposition。At last, we measure the activity of nano-CaCO₃ after calcining. Our conclusion is nano-CaCO₃ has outstanding advantage during the second stage of desulphurization.