CO2 Capture and Use in a Novel Coal-Based Polygeneration System

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• 作者：Qun Yi ; Yang Fan ; Wenying Li ; Jie Feng
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：October 2, 2013
• 年：2013
• 卷：52
• 期：39
• 页码：14231-14240
• 全文大小：614K
• 年卷期：v.52,no.39(October 2, 2013)
• ISSN：1520-5045

文摘

A novel coal-based polygeneration system with CO₂ recycling for CO₂ capture is proposed. Two CO₂ recycling schemes exist in this system. In the first, CO₂ is recycled into the gasifier as the gasifying agent. In the second, CO₂ is recycled into the gas turbine as a diluent. Compared with conventional CCS systems, this new system avoids the use of water gas shift and CO₂ separation processes to capture CO₂, and, more importantly, a part of CO₂ can be converted into CO in coal gasification and be used to synthesize chemicals, improving carbon element utilization and chemical output. By means of exergy analysis, comparison with four conventional single production systems shows that the proposed system provides more than 11% in energy savings and more than 25% in capital investment saving. The exergy efficiency, CO₂ emission, and internal rate of return may be expected to reach 46.3%, 0.47 t路(t-coal)^鈭? and 14.76%, respectively.