灰化学成分对生物质气化特性的影响规律  

Effect of ash chemical components on biomass gasification properties

作　　者：葛泽峰 吴雨青 曾名迅 查振婷 马宇娜 侯增辉 张会岩[1] GE Zefeng;WU Yuqing;ZENG Mingxun;ZHA Zhenting;MA Yuna;HOU Zenghui;ZHANG Huiyan(School of Energy and Environment,Southeast University,Nanjing 210096,Jiangsu,China)

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《化工学报》2023年第5期2136-2146,共11页CIESC Journal

基　　金：国家自然科学基金项目(52106231);东南大学博士后前沿科学基金项目(2242022R20008)。

摘　　要：气化利用是实现生物质资源高效清洁利用的有效方式之一,灰化学组成是影响生物质气化的主要因素,不同无机组分对生物质气化特性的影响规律尚不完善。通过酸洗脱灰耦合灰化学模化物负载的方式,对灰化学成分的作用进行了系统的研究。结果表明,P是除Na、K之外,造成气化灰渣烧结熔融的主要因素之一;不同助剂的加入均可抑制CH4析出,酸性助剂(Si、Al、P)的添加有助于CO的生成,降低体系的冷煤气效率(CGE)和合成气品质(H2/CO);碱性助剂(Ca、Fe、Mg、K、Na)趋向于提高H2和CO_(2)产率,对体系H2/CO改善作用显著,Fe基助剂可使其由0.75提升至1.54。Gasification is one of the effective ways to realize the efficient and clean utilization of biomass resources.The chemical composition of ash is the main factor affecting the gasification of biomass.The influence of different inorganic components on the gasification characteristics of biomass is not yet perfect.In this paper,the raw corn stalk sample was first pre-treated by acid washing to remove the original ash compositions.Then the chemical modulus of different inorganic components was severally loaded on the de-ashing feedstock.After that,the role of ash chemical composition was systematically investigated by a rapid fixed-bed gasification reactor.The addition of inorganic fluxes could enhance the real time yield of hydrogen and restrain the release of methane.The alkaline additives(Ca,Fe,Mg,K,Na)tend to increase H_(2)and CO_(2)yields,which have a significant effect on the improvement of the syngas quality(H_(2)/CO),especially Fe based additives can improve H_(2)/CO from 0.75 to 1.54.The addition of acidic additives(Si,Al,P)contributes to CO generation and reduces the cold gas efficiency(CGE).In addition,P,Na and K were prone to escape from the solid phase to the gas phase as the volatile fraction,and Si would totally stay in the solid slag.Furthermore,it can be obtained that P is one of the main factors causing ash sintering and melting problems except for Na and K.All the obtained data was meaningful to provide a modifying reference for alleviating ash-related problems,modifying flux addition principle and the efficient utilization of biomass wastes during gasification process.

关 键 词：生物质 固定床 合成气 灰化学组成 残渣烧结 气化效率 在线检测 

分 类 号：TK6[动力工程及工程热物理—生物能]