Abstract The solid residue of gasification, or gasification char, is in many cases considered as a waste material inevitably generated during the operation of gasifiers. However, it is a good candidate to substitute synthetic catalysts for tar reforming and it is a carbon-rich material with a good potential for carbon negative applications as biochar. In this work, a wood-derived gasification char was tested for the upgrading of producer gas generated from pilot-scale gasification of wheat straw. The effect of a char bed in combination with partial oxidation was assessed under different conditions. The presence of the char bed markedly reduced the total tar concentration, but the bed material suffered deactivation. Partial oxidation prolonged the activity of the char bed by promoting reforming reactions at the surface of char particles and further reduced the tar content below 1 g/Nm3. Post-experimental characterization of the spent chars revealed a decreased surface area, a more ordered carbon phase and an increased resistance to thermal degradation. The results show that under optimized conditions, gasification char is a promising substrate for tar reforming and the upgrading of producer gas to syngas. Moreover, the changes in the char suggested possible cascade uses of the spent material for carbon sequestration.

中文翻译：

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应用于中试规模气化炉焦油重整的残余气化焦炭：用于透视级联用途的焦炭特性的性能和演变

摘要 气化的固体残渣或气化炭在很多情况下被认为是气化炉运行过程中不可避免地产生的废料。然而，它是替代合成催化剂进行焦油重整的良好候选者，并且它是一种富碳材料，具有作为生物炭的碳负应用的良好潜力。在这项工作中，对木材衍生的气化炭进行了测试，用于升级小麦秸秆中试气化产生的发生炉气。在不同条件下评估了炭床与部分氧化相结合的效果。炭床的存在显着降低了总焦油浓度，但床材料会失活。部分氧化通过促进炭颗粒表面的重整反应延长了炭床的活性，并进一步将焦油含量降低到 1 g/Nm3 以下。用过的炭的实验后表征显示表面积减小，碳相更有序，并且对热降解的抵抗力增强。结果表明，在优化条件下，气化焦是焦油重整和发生炉煤气升级合成气的一种有前景的底物。此外，炭的变化表明废材料可能用于碳封存的级联用途。结果表明，在优化条件下，气化焦是焦油重整和发生炉煤气升级合成气的一种有前景的底物。此外，炭的变化表明废材料可能用于碳封存的级联用途。结果表明，在优化条件下，气化焦是焦油重整和发生炉煤气升级合成气的一种有前景的底物。此外，炭的变化表明废材料可能用于碳封存的级联用途。