101.石炭燃焼時の無機成分の放出に関する基礎的検討

抄録

The release of inorganic matters from coal combustion as volatile matters and aerosols at high temperatures and their deposition on lower temperature surfaces were investigated fundamentally. About 100mg of coal (SS027) smaller than 100μm held in a platinum basket was inserted into an electronic furnace and burned at 1080℃ to release vapor and aerosols of inorganic matters. A packed bed of ZrO_2 beads of 2mm was placed in the downstream of the reactor. The temperature of the bed was controlled at about 100℃ so that inorganic matters would be cauyht on the ZrO_2 beads. The quantities of inorganic matters ccaught on the ZrO_2 beads after 1, 10, 30, 60 and 180min of coal combustion were determined by use of inductively coupled plasma (ICP). It was found that initially, inorganic matters such as alkali, alkaline earth metals and iron release during volatilization followed by the release from char burning process. Inorganic matters further continued to be released from ash.