Zheng Zongming, Luo Laixing, Feng Anwen, Iqbal Tahir, Li Zhuoyan, Qin Wu, Dong Changqing, Zhang Shanghong, Xiao Xianbin
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources & School of New Energy, North China Electric Power University, Beijing 102206, China.
Faculty of Agricultural Engineering & Technology, PMAS-Arid Agriculture University, Rawalpindi 46000, Pakistan.
ACS Omega. 2020 Sep 14;5(38):24403-24411. doi: 10.1021/acsomega.0c02787. eCollection 2020 Sep 29.
The chemical looping gasification (CLG) process is a promising pathway to produce hydrogen-enriched syngas with biomass. It is urgent to enhance the reactivity and thermal stability of oxygen carriers (OC) and capture the inherently separated CO. This work presents the strategy of simultaneous modification of a FeO/AlO oxygen carrier and the supplement of an oxidant for corn stalk chemical looping gasification by introducing KNO-containing ethanol liquid waste. CaO is employed to capture the generated CO and promote the reaction balance toward hydrogen production in a fuel reactor (FR). The highest carbon conversion reaction rate of 1.1 × 10 mol/g could be obtained at the ratio of CaO to fuel carbon and the reaction temperature of 1.5 and 600 °C, respectively. The kinetics and thermodynamics analyses under the optimized condition are further discussed to verify the possibility and high efficiency of using alkaline organic liquid waste to boost solid fuel gasification for hydrogen production. This CLG strategy shows multifunctional merits, including organic liquid waste treatment, biomass CLG promotion, and hydrogen production enhancement.
化学链气化（CLG）工艺是利用生物质生产富氢合成气的一条很有前景的途径。提高氧载体（OC）的反应活性和热稳定性并捕集固有分离的CO迫在眉睫。本工作提出了通过引入含KNO₃的乙醇废液对FeO/Al₂O₃氧载体进行同步改性以及为玉米秸秆化学链气化补充氧化剂的策略。采用CaO在燃料反应器（FR）中捕集生成的CO并促进反应平衡向制氢方向移动。在CaO与燃料碳的比例分别为1.5以及反应温度为600℃时，可获得最高碳转化反应速率1.1×10⁻³ mol/g。进一步讨论了优化条件下的动力学和热力学分析，以验证使用碱性有机废液促进固体燃料气化制氢的可能性和高效性。这种CLG策略具有多功能优点，包括有机废液处理、促进生物质CLG以及提高制氢量。
