Abstract Chemical Looping Gasification (CLG) is a dual fluidized bed gasification technique where an oxygen carrier is used as bed material instead of sand. An optimized process could have several advantages, including i) one concentrated CO2 stream, amiable for carbon capture, ii) less tar formation, iii) additional reaction pathways for syngas production, iv) less corrosion and v) CO2 is generated in one stream from the fuel reactor that could be captured. Steel converter slag, also called LD slag, is a by-product from the steel industry which, besides iron, contains significant fractions of Ca, Mg, Al and Mn in a complex matrix of phases. The low cost and presence of known catalytic solid phases in the slag makes it interesting as an oxygen carrier in CLG. In this work, LD slag was investigated using a batch reactor with gaseous and solid fuel as well as with TGA. It was found that during gasification with LD slag, the material can i) transfer oxygen to the fuel, ii) catalyze the water-gas-shift reaction, iii) react with CO2 forming carbonates and iv) split water to hydrogen. The overall result was a raw gas with a higher H2/CO ratio for LD slag than the other tested materials.

中文翻译：

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转炉渣作为氧载体用于化学循环气化

摘要 化学循环气化 (CLG) 是一种双流化床气化技术，其中使用载氧体代替沙子作为床层材料。优化的工艺可能有几个优点，包括 i) 一股浓缩的 CO2 流，可用于碳捕获，ii) 较少的焦油形成，iii) 用于合成气生产的额外反应途径，iv) 较少的腐蚀和 v) 从可以捕获的燃料反应堆。转炉炉渣，也称为 LD 炉渣，是钢铁工业的副产品，除铁外，在复杂的相基质中还含有大量 Ca、Mg、Al 和 Mn。炉渣中的低成本和已知催化固相的存在使其成为 CLG 中的氧载体。在这项工作中，使用具有气体和固体燃料以及 TGA 的间歇反应器对 LD 炉渣进行了研究。发现在用 LD 炉渣气化过程中，该材料可以 i) 将氧气转移到燃料中，ii) 催化水煤气变换反应，iii) 与 CO2 反应形成碳酸盐和 iv) 将水分解为氢气。总体结果是，LD 炉渣的原始气体比其他测试材料具有更高的 H2/CO 比。