Riser-Based Carbon Stripper for Coal-Fueled Chemical Looping Combustion

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• 作者：Hongming Sun ; Mao Cheng ; Zhenshan Li ; Ningsheng Cai
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：March 2, 2016
• 年：2016
• 卷：55
• 期：8
• 页码：2381-2390
• 全文大小：643K
• ISSN：1520-5045

文摘

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 2–63 wt % mixtures can be entrained, containing 17–100 wt % plastic beads. An appropriate gas velocity range for separating plastic beads from ilmenite particles is 2–2.25 m/s. The appropriate mixture feeding rate is below 23.7 kg/m²·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.