微粉炭ボイラにおける灰付着低減技術の開発(Session 1)

抄録

In order to enhance net power generation efficiency obtained by pulverized coal fired boilers more, it is necessary to fundamentally develop reduction technologies of ash deposit during operation. The thermal coating technology on surfaces of heat exchanger tubes was applied to reduce the ash deposit during coal combustion in this study. Such several tests as the ash melting experiments at high temperature, the deposition experiments of ash particles and the measurements of deposition force after long-term keeping under the simulated boiler condition were carried out. Consequently, the Ni alloy specimen was selected as the best coating material to control the ash deposit. Finally, that coating material was also tested in practical boilers and showed the good performance on the reduction of ash deposit.