70.石炭と下水汚泥の混焼における灰粒子の挙動

抄録

Coal with sludge were co-combusted in laboratory-scaled drop tube furnace, the transformation behaviors of ash particles, having size of both micro-and sub micron-scale, were studied. The reaction temperatures ranged from 1000℃ to 1200℃, and the residence time varied from 0.6 to 2.4 seconds. The gas atmosphere, containing 10% oxygen and nitrogen being balance, was used for combustion in all runs. The ash particles gotten in each run, which might be mixed with char at short residence time, were collected by the combination of sampling probe, cyclones and cascade impactor together. The former two mainly capture ash particles having size larger than 10 micron, while the latter was used to capture the sub micron particles, namely as particulate matter in the exiting gas. The above ash-capturing procedure guaranteed a wider viewpoint on ash study, which might include interaction of ash particles in micron scale, vaporization and condensation of trace elements in ash particles in sub micron scale, all of them have been studying and part of it will be introduced briefly here.