STUDY ON THE RELEASE CHARACTERISTICS OF HCN AND NH3 IN COAL GASIFICATION

摘要

The releasing characteristics of the coal-gasification productions were inspected in the TGA-FTIR online instruments. Pingdingshan bituminous coals with three kinds of sizes had been selected to study in three kinds of atmosphere. It has indicated that there are remarkable influences of the sizes and the atmosphere to the release of HCN and NH3. The smaller the sizes are, the faster the volatile matter releases, so the releasing velocity of HCN reaches most early. Meanwhile, the more the pores are, the more the active locations for coal gasification are. The lower the concentration of CO2 is, the more difficult HCN converts to NH3 or N2. The concentration of CO2 could influence the releasing characteristic of the N-containing components, the littler the coverage rate of active locations is, and the slower C、N-containing function component react, and the slower active H releases, so HCN transforms to NH3 slowly to make the concentration of HCN to increase.