Structure Characteristics and Gasification Reactivity of Co-Pyrolysis Char from Lignocellulosic Biomass and Waste Plastics: Effect of Polyethylene

Xingping Kai, Lesheng Wang,Tianhua Yang,Tao Zhang,Bingshuo Li, Zhaowei Liu, Wenwen Yan,Rundong Li

International Journal of Biological Macromolecules（2024）

Cited 0|Views6

Abstract

The rate limiting stage is char reactivity during gasification that can be influenced by its physicochemical structural characteristics. In this study, the effects of feedstock share, rice straw (RS) and polyethylene (PE), on the physicochemical properties and gasification reactivity of chars were investigated and their relationships were discussed. The char gasification reactivity was investigated via isothermal experiments using a thermal analyzer. The results indicated that the PE addition improved the specific surface area (SSA) and pore volume (Vp) of the char obtained from co-pyrolysis RS with PE. The SSA of the char increased by 1.31 times when the PE content was 60 wt%, compared with that of RS char. The order degree and gasification reactivity of the co-pyrolysis char samples increased with increasing PE content beyond 40 wt%. The char reactivity in the early stage of cogasification was primarily determined by the order degree of carbonaceous and pore structure. The char reactivity in the later stage was influenced by these two factors and the silicon dioxide content could inhibit the char co-gasification reactivity.

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Key words

Rice straw,Polyethylene,Structure characteristics,Pyrolysis,Char,Gasification reactivity

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【要点】：研究探讨了聚乙烯与稻秸秆共热解得到的焦炭的物理化学特性和气化反应性，发现聚乙烯的添加能显著提高焦炭的比表面积和孔隙体积，从而增强气化反应性。

【方法】：通过等温实验使用热分析仪研究了焦炭的气化反应性。

【实验】：实验使用的是稻秸秆（RS）和聚乙烯（PE）作为原料，通过热解得到的焦炭，发现当PE含量为60 wt%时，焦炭的比表面积增加了1.31倍，气化反应性随PE含量增加而提高，特别是在PE含量超过40 wt%之后。实验结果表明，气化反应初期焦炭的反应性主要受碳质有序度和孔隙结构的影响，而后期则同时受这两因素及二氧化硅含量的影响。