(582cu) Coal Char Gasification in CO2 and CO Atmosphere: Effect of Pressure on the Inhibiting Behavior of CO

Experimental data of char-CO₂ gasification kinetics is important for optimizing existing gasifiers and designing of highly efficient gasifiers. In a commercial gasifier, char-CO₂ gasification occurs in the presence of CO. CO is known to inhibit char-CO₂ reaction. Therefore, determining the extent of inhibition of CO with pressure is necessary for the development of a high-fidelity kinetic model. In the present study, char from Pittsburgh no.8 coal was generated in a high pressure laminar flow reactor in CO₂/N₂ environment at a temperature of 1300 ^oC and a pressure of 11.3 Bar. The char generated from the laminar flow reactor was then used to study the inhibiting effect of CO on char-CO₂ reaction at various total pressures (1, 5, 10, 20 bar) with varying CO/CO₂ concentrations (0, 0.1 and 0.3) in a high pressure thermogravimetric analyzer. The extent of inhibition by CO on char-CO₂ reaction at various pressures was determined using LH kinetic model.