Valorisation of plastic waste or forest-agroindustrial residues poses an opportunity to reduce landfilling and to obtain value-added products simultaneously. Through thermal partial oxidation, hydrocarbon fuels can be gasified and converted into syngas. Particularly, hybrid porous media reactors allow gasifying low-grade fuels in an efficient eco-friendly way. In this work, the natural gas-supported gasification of polyethylene and wood mixtures in a porous bed reactor is studied. The reactor is designed and built to operate in semi-continuous mode. The temperature evolution, the reaction wave propagation rate, and the resulting concentration of the main gas species (H₂, CO, CH₄, CO₂, NO_x, and UHC) were measured for different polyethylene and wood mixtures, keeping an optimum natural gas-to-air ratio of 0.8. The influence of the gasification conditions on the reaction pathways and the process development is analysed by sampling the system in two representative moments. The maximum syngas production was 23.86 vol%, which was obtained when loading only 100% polyethylene, while the maximum energy return on investment of 49% was registered for the highest biomass fraction in mixture. The semi-continuous operation design was validated based on the thermal behaviour and the combustion wave displacement. This experimental work shows promising results in the search for solutions to gasify solid wastes in continuous mode.

对塑料废料或森林农用工业残留物进行估价，为减少垃圾掩埋并同时获得增值产品提供了机会。通过热部分氧化，烃类燃料可以被气化并转化为合成气。特别地，混合多孔介质反应器允许以有效的生态友好方式气化低级燃料。在这项工作中，研究了在多孔床反应器中以天然气为载体的聚乙烯和木材混合物的气化。反应堆的设计和制造可在半连续模式下进行。温度变化，反应波传播速率以及所产生的主要气体种类（H ₂，CO，CH ₄，CO ₂，NO _x的浓度）（和UHC）对不同的聚乙烯和木材混合物进行了测量，使天然气与空气的最佳比例保持在0.8。通过在两个代表性的时刻对系统进行采样，分析了气化条件对反应路径和过程发展的影响。最高合成气产量为23.86 vol％，仅在装载100％聚乙烯时获得，而混合物中生物质最高的部分则获得了49％的最大投资回报率。基于热行为和燃烧波位移对半连续运行设计进行了验证。该实验工作在寻找以连续模式气化固体废物的解决方案中显示出令人鼓舞的结果。