The Effect of CBB(CaO·BaO·B 2 O 3 ) Addition on the Physical Properties and Oxygen Transfer Reactivity of NiO-based Oxygen Carriers for Chemical Looping Combustion

Abstract >> Spray-dried NiO-based oxygen carriers developed for chemical looping combustion required high calcination temperatures above 1300 ℃ to obtain high mechanical strength applicable to circulating fluidized-bedprocess. In this study, the effect of CBB (CaO·BaO·B 2 O 3 ) addition, as a binder, on the physical properties andoxygen transfer reactivity of spray-dried NiO-based oxygen carriers was investigated. CBB addition resulted in several positive effects such as reduction of calcination temperature and increase in oxygen transfer capacity andporosity. However, oxygen transfer rate was considerably decreased. This was more apparent when a higher amount of CBB was added and MgO was added together. From the experimental results, it is concluded that CBB addedNiO-based oxygen carriers are not suitable for chemical looping combustion and a new method to reduce calcinationtemperature while maintaining high oxygen transfer rate of NiO-based oxygen carriers should be found out.Key words : CLC(케미컬루핑연소), Oxygen carrier(산소전달입자), CBB(씨비비), Nickel oxide(산화니켈), Spraydrying(분무건조)