Three coal chars were gasified with carbon dioxide or steam using a Pressurized Drop Tube Furnace (PDTF) or thermogravimetry (TGA) at high temperature to simulate the inside of an air-blown two-stage entrained flow coal gasifier, and the kinetics of gasification reaction was analyzed up to 1500℃. Prepared chars, made by rapid pyrolysis of pulverized coals using a DTF, had about 40μm of average particle size. As a result, the gasification rate of each char was controlled by pore diffusion above about 1200℃ or 1300℃, and it was made clear that the gasification rate had a large difference between coal types at pore diffusion zone the same as at reaction control zone.
