Chemical looping gasification of solid fuels using bimetallic oxygen carrier particles - Feasibility assessment and process simulations

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• 作者：Feng He ; Nathan Galinsky ; Fanxing Li ; ^{fli5@ncsu.edu}
• 关键词：Chemical looping ; Gasification ; Hydrogen ; CO2 capture ; Oxygen carrier
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：27 June, 2013
• 年：2013
• 卷：38
• 期：19
• 页码：7839-7854
• 全文大小：2302 K

文摘

The chemical looping gasification (CLG) process utilizes an iron-based oxygen carrier to convert carbonaceous fuels into hydrogen and electricity while capturing CO₂. Although the process has the potential to be efficient and environmentally friendly, the activity of the iron-based oxygen carrier is relatively low, especially for solid fuel conversion. In the present study, we propose to incorporate a secondary oxygen carrying metal oxide, i.e. CuO, to the iron-based oxygen carrier. Using the ¡°oxygen-uncoupling¡± characteristics of CuO, gaseous oxygen is released at a high temperature to promote the conversion of both Fe₂O₃ and coal. Experiments carried out using a Thermal-Gravimetric Analyzer (TGA) indicate that a bimetallic oxygen carrier consisting of a small amount (5 % by weight) of CuO is more effective for coal char conversion when compared to oxygen carrier without copper addition. ASPEN Plus^? simulations and mathematical modeling of the process indicate that the incorporation of a small amount of copper leads to increased hydrogen yield and process efficiency.