화학공학소재연구정보센터
Industrial & Engineering Chemistry Research, Vol.55, No.8, 2381-2390, 2016
Riser-Based Carbon Stripper for Coal-Fueled Chemical Looping Combustion
Carbon stripping is critical to preventing char particles from reaching air reactors. In this study, a riser-based carbon stripper is proposed to separate the lighter char particles from the heavier oxygen carrier particles. The performance of the proposed riser-based carbon stripper in the separation of plastic beads from ilmenite particles was experimentally investigated, where plastic beads were used to simulate the behavior of char particles. The effects of gas velocity and solids circulation rate on the separation characteristics were studied. The results showed that 263 wt % mixtures can be entrained, containing 17100 wt % plastic beads. An appropriate gas velocity range for separating plastic beads from ilmenite particles is 22.25 m/s. The appropriate mixture feeding rate is below 23.7 kg/m(2)s. The power cost analysis shows that the riser-based carbon stripper is more efficient than the larger fuel reactor strategy in increasing CO2 capture efficiency when using solid fuels that require long residence times.