ABSTRACT

In this work, the steam gasification and chemical looping gasification (CLG) of lignite and rice husk (LRH) over 5% Co₃O₄/CuO oxygen carrier were conducted on a fixed-bed system by non-isothermal method. The non-isothermal oxygen uncoupling experiments showed that the oxygen uncoupling temperature of 5% Co₃O₄/CuO (730°C) was lower than that of CuO (800°C). It was ascribed to the synergy of CuO and Co₃O₄. The gasification results showed that the yields of gas products (H₂, CO, CO₂ and CH₄) in CLG of lignite or rice husk were higher than that in steam gasification because of the catalytic function of Co₃O₄/CuO oxygen carrier. Moreover, the catalysis of K and the transferring of active OH and H radicals from the biomass to the coal will show a synergetic effect between LRH. So the yields of gas products in chemical looping co-gasification (CLCG) were also higher than that in steam co-gasification or individual CLG. Furthermore, the carbon conversion rate in CLCG of LRH was 24.99% higher than that in steam co-gasification. It showed that CLCG of coal and biomass was effective for syngas generation, and the presence of 5% Co₃O₄/CuO oxygen carrier enhanced the generation of syngas.

摘要

在这项工作中，采用非等温法在固定床系统上进行了5％Co ₃ O ₄ / CuO氧载体上褐煤和稻壳（LRH）的蒸汽气化和化学循环气化（CLG）。非等温氧解耦实验表明，5％Co ₃ O ₄ / CuO（730°C）的氧解偶联温度低于CuO（800°C）。这归因于CuO和Co ₃ O ₄的协同作用。气化结果表明，由于Co的催化作用，褐煤或稻壳CLG中气体产物（H ₂，CO，CO ₂和CH ₄）的产率高于蒸汽气化中的产率。₃ O ₄ / CuO氧载体。此外，钾的催化和活性OH和H自由基从生物质向煤的转移将显示LRH之间的协同作用。因此，化学循环共气化（CLCG）中的气体产物的产率也高于蒸汽共气化或单独CLG中的气体产物的产率。此外，LRH的CLCG中的碳转化率比蒸汽共气化中的高24.99％。结果表明，煤和生物质的CLCG对合成气的产生有效，5％Co ₃ O ₄ / CuO氧载体的存在促进了合成气的产生。