The Influence of the Combustion Atmosphere on the Desulfurization Characteristics

Abstract

In this paper, the influences of combustion atmosphere on the desulfurization characteristics such as SO2 emission, Content of f-CaO, desulfurization degree and mneralogical composition by means of flue gas analysis, chemical analylsis and X-ray diffraction(XRD). The results show that calcium sulphoaluminate gradually increase as the temperature and reached a maximum at 1300°C. However, during the process of coal combustion, the generation quanlity of calcium sulphoaluminate is not much. This is because the material composition of the coal complex, such as Fe2S, SiO2 and other substances have more influence on calcium sulphoaluminate formation. And oxidizing atmosphere promotes the ability of desulfurization at high temperature combustion, and the reducing atmosphere is contrary. The oxidizing atmosphere reduces the SO2 emissions, improves the burnability of raw materials, promotes the formation of calcium sulphoaluminate and thus increases the desulfurization degdree. Whereas, the reducing atmosphere promotes the decomposition of CaSO4, increasing the SO2 emissions and f-CaO contents, reduces the formation of calclium desulfurization degree greatly, and then decreases the desulfurization degree. Introduction