基于铁-铜载氧体的麦秆与褐煤共气化特性研究

Study on co-gasification characteristics of wheat straw and lig-nite using iron-copper oxygen carriers

中文关键词: 麦秆；褐煤  化学链气化；载氧体；合成气

英文关键词: wheat straw  lignite  chemical looping gasification  oxygen carrier  syngas

中文摘要:

      随着能源需求增长与环保要求提升，生物质与煤炭协同利用成为资源高效转化的重要研究方向。本文以河南褐煤和小麦秸秆为原料，采用化学链气化（CLG）技术，研究掺杂Cu的铁基载氧体对共气化过程的催化作用，并优化关键工艺参数。通过溶胶凝胶法、机械混合法和浸渍法制备不同负载比例的载氧体，结合XRD与SEM表征分析其晶相组成及微观结构，探究载氧体制备方式、负载比例、反应温度、载氧体与混合原料质量比(OC/MF)与蒸汽与混合原料质量比(S/MF)对气化产物分布的影响。结果表明：溶胶凝胶法制备的Cu30Fe30@Al2O3载氧体性能最佳，其表面均匀负载CuFe2O4活性组分，孔隙结构丰富，显著提升合成气产率与H2/CO。工艺优化当OC/MF=0.5、温度900℃、S/MF=5时，气体产量达6750 mL·kg-1，碳转化率（ηc）与冷气效率（CGE）分别为56.6%与60.3%，H2/CO体积比为1.9，温室气体排放指数（I）降至0.41。本研究为生物质与褐煤协同气化的催化剂设计与工艺调控提供了实验参考。

英文摘要:

      With the increasing energy demands and environmental requirements, the synergistic utilization of biomass and coal has emerged as a critical research direction for efficient resource conversion. This study investigates the catalytic effects of Cu-doped iron-based oxygen carriers (OCs) on the co-gasification process of Henan lignite and wheat straw using chemical looping gasification (CLG) technology, while optimizing key operational parameters. Three preparation methods—sol-gel, mechanical mixing, and impregnation—were employed to synthesize OCs with varying Cu-loading ratios. The crystallographic phases and microstructures of the OCs were characterized via XRD and SEM. The effects of OC synthesis methods, Cu-loading ratios, reaction temperature, OC-to-mixed fuel mass ratio (OC/MF), and steam-to-mixed fuel mass ratio (S/MF) on gasification product distribution were systematically evaluated. Results demonstrate that the sol-gel-derived Cu30Fe30@Al2O3 OC exhibited optimal performance, with uniformly dispersed CuFe2O4 active components and a porous structure, significantly enhancing syngas yield and H2/CO ratio. Under op-timized conditions (OC/MF=0.5, 900°C, S/MF=5), the gas yield reached 6750 mL·kg?1, with carbon conversion effi-ciency (ηc) and cold gas efficiency (CGE) of 56.6% and 60.3%, respectively. The H2/CO volumetric ratio stabilized at 1.9, while the greenhouse gas emission index (I) decreased to 0.41. This work provides experimental insights into catalyst design and process optimization for biomass-lignite co-gasification systems.