No.45 加圧二段噴流床石炭ガス化炉のガス化特性に関する検討 : ガス化剤酸素濃度の影響(ガス化・燃焼・液化(5))

抄録

In the air blown IGCC demonstration plant, a small scale air separation unit (ASU) is set up. Nitrogen from ASU is used for the transportation of coal and the char etc., and oxygen is mixed with air as a gasifying agent. From the viewpoint of a highly effective and stable operation of the gasifier, and improvement of plant efficiency in a commercial plant, in order to optimize the oxygen concentration of the gasifying agent, it is necessary to clarify the influence of the oxygen concentration in the gasifying agent on the gasification performance quantitatively. In this study, the influence of the oxygen concentration in the gasifying agent on the gasifier per pass performance was clarified by using a 3t/d bench scale coal gasifier. In addition, the gasification performance in the state of char-balance was estimated from the heat and mass balance of the gasifier. As a result, the influence of the oxygen concentration in the gasifying agent on the gasification performance (cold gas efficiency, char product rate, gas temperature in combustor, etc.) was able to be evaluated quantitatively.