茶滓を原料とするバイオコークスによる溶解炉内観察と燃焼シミュレーション

摘要

Global environment problems have become more and more serious in recent years, and reduction of greenhouse gas emissionbased on Kyoto Protocol adopted at the 3rd conference of the parties of the United nations Framework Convention on ClimateChange(COP3);securement of primary energy source and development of clean and renewable energy sources have been pressinglyneeded in consideration of the predicted depletion of fossil fuel in the future.In this study,we explore the use of a solidified biomass-derived fuel,having the maximum compressive strength of 1 OOMPaand calorific value of 21MJ/kg,in iron-casting or iron-making processes as an alternative fuel to be mixed with coal coke. Thisstudy,carried out for internal observation using a quick-freeze technique,observed an actual working cupola furnace under the20% alternative coal coke operation condition.After quick freeze of the cupola furnace,the solidified biomass fuel was found toinhabit near the iron-melting zone. Especially,this solidified biomass fuel smoothly changes carbonized fuel through high-densitystate during the operating process. On the other hand,this study tried to simulate gasification combustion under a high temperatureenvironment instead of actual internal combustion of solidified biomass fuel. These combustion mechanisms were confirmed to besimilar to diffusion-flame phenomena in general.