生物质灰在化学循环气化过程中对红泥的结构演变和氧气捐赠能力的影响
Xiao Li1, Rumeng Zhang1, Rui Dong1
1Key Laboratory of Coal Processing, Efficient and Clean Utilization, Ministry of Education, School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China.
Waste management (New York, N.Y.)
|July 19, 2025
概括
作为化学循环气化中的氧气载体的红泥增强了富含的合成气的生产. 生物质灰的组成显著影响性能,金属增加了反应性,二氧化造成问题.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 化学循环气化 (CLG) 有效地从生物质废物中生产富含的合成气.
- 氧气载体对CLG至关重要,但与生物质灰的相互作用可能会阻碍性能.
- 富含氧化铁 (Fe2O3) 的红泥是一种潜在的低成本氧气载体.
研究的目的:
- 调查生物质灰组成对红泥作为CLG中的氧载体的性能的影响.
- 了解红泥和不同生物质灰之间的协同作用和对抗作用.
- 为了阐明在气化过程中铁基氧载体的结构变化.
主要方法:
- 使用红色泥土作为氧气载体,与含灰量和组成不同的生物质原料 (玉米和大豆) 进行了利用.
- 分析了气化性能,重点关注合成气产量和质量.
- 采用X射线衍射 (XRD) 和X射线光电谱 (XPS) 来研究氧载体的结构和化学变化.
主要成果:
- 生物质灰的组成与气化性能有显著的相关性.
- 玉米灰含有高和土金属,显示出协同效应,增加了由于表面裂纹的反应速率.
- 富含SiO2的大豆灰与红泥中的Al2O3发生反应,导致聚合和烧结,从而降低性能.
结论:
- 红泥对于CLG来说是一个可行的氧气载体,但它的性能高度依赖于生物质灰的特性.
- 生物质灰中的金属促进了气化,而二氧化可以导致有害的聚合物.
- 在气化过程中,以铁为基础的氧载体经历了可逆的还原-氧化循环 (Fe2O3 → Fe3O4 → FeO → Fe → Fe3O4).
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