CO_2 gasification reactivity of Huainan bituminous coal char under different pressures
Abstract：Huainan bituminous was pyrolyzed under different heating rates and the resultant chars were pressurized gasified under high temperature pressurized thermogravimetric analyzer(PTGA),then the kinetic parameters were also calculated.It is observed that the surface of rapid pyrolysis char(HN-RP) appears more loose and porous than that of the slow pyrolysis char(HN-SP);the stacking height of crystalline structure and radial spread dimension in char crystallites of the HN-SP are more intense than that of the HN-RP,resulting in a worse reaction reactivity;the concentration of oxygen surface complex C(O) increases with the increasing of pressure,they attach on the char surface and lead an improved char gasification reactivity;the overall gasification reaction formula can calculate the pressurized gasification kinetic parameters and in the dominating reaction range,the obtained correlation coefficients are all higher than 0.988;with the increase of pressure,the order of reaction n is liable to decrease.
Keywords：Huainan bituminous coal charCO2 gasification reactivitykinetic parameterspore structurecrystalline structureoxygen surface complex
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 2097-2101 )