COMPARISON BETWEEN COAL-GASIFICATION RATE IN BENCH-SCALE FLUIDIZED-BED COAL GASIFIER AND THOSE IN PILOT-PLANT

Experiments of pressurized fluidized bed coal gasification in our pilo t at a coal feed rate from 500 to 1,500 kg/h were conducted. Comparing the char gasification rate per unit volume of a fluidized bed and met hane yield between the upper gasifier of the pilot plant and the previ ous bench scale apparatus at a coal feed rate of about 6 kg/h, the cha r combined gasification rate per unit volume in the bench scale appara tus was 3 to 4 times larger than that in the pilot plant. Then, the ch ar combined gasification rate in the upper gasifier of the pilot plant calculated with a two-phase model that assumed perfect mixing of gas and solid in the emulsion phase and gas plugging flow in the bubble ph ase was the same as that in the previous bench scale apparatus. Despit e the scale difference, arranging the methane production rate for the methane yield, the methane yield in the bench-scale was the same as th at in the pilot plant.