摘要
生物质气化过程中碱金属的存在易导致载氧体失活、碳资源利用率及气化效率下降,严重制约了化学链气化技术的稳定运行与工程应用。针对该问题,设计了一种Ni基核壳结构复合载氧体,以提升其抗碱金属与抗积碳能力。同时,提出异位化学链气化配置工艺,兼顾利用碱金属催化断键与气化作用,削弱其与灰分交互作用对载氧体的影响。进一步探讨了不同水蒸气/生物质质量比(1.5、3.0、4.5、6.0)对气化性能与载氧体稳定性的影响。结果表明,该载氧体在异位配置、实验温度为900℃、水蒸气/生物质质量比为4.5的条件下,气化性能最优。15次循环中产气率稳定在1887.13 mL/g,碳转化率与气化效率整体维持在79%~86%与113%~122%。本研究在碱金属共存条件下,提出并验证基于载氧体优化与工况协同调控的策略,为生物质气化过程的稳定运行与工程应用提供理论支撑。
The presence of alkali metals in biomass gasification can readily cause deactivation of oxygen carriers,reduce carbon conversion rate and gasification efficiency,thereby posing significant challenges to the stable operation and engineering application of chemical looping gasification systems.To address this issue,a Ni-based core-shell structured composite oxygen carrier was developed to improve its resistance to alkali-induced deactivation and carbon deposition.Meanwhile,an ex-situ chemical looping gasification configuration process was proposed,aiming to both harness the catalytic role of alkali metals in bond cleavage and gasification,to mitigate their adverse interactions with ash components that may compromise carrier integrity.Furthermore,the effects of different steam-to-biomass mass ratios(1.5,3.0,4.5,and 6.0)on gasification performance and oxygen carrier stability were investigated.Experimental results revealed that,the composite carrier exhibited optimal performance under ex-situ operation with S/B ratio of 4.5,at 900℃.Over 15 cycles,the gas yield remained stable at 1887.13 mL/g,while the carbon conversion rate and gasification efficiency were consistently maintained within the ranges of 79%-86%and 113%-122%,respectively.This work proposed and validated an integrated process strategy based on oxygen carrier optimization with coordinated process regulation under coexistence of alkali metals,providing theoretical guidance for the long-term stability and engineering viability of biomassbased chemical looping gasification systems.
作者
张彤语
廖艳芬
唐玉婷
马晓茜
ZHANG Tongyu;LIAO Yanfen;TANG Yuting;MA Xiaoqian(Guangdong Key Laboratory of Energy Efficiency and Clean Utilization,School of Electric Power Engineering,South China University of Technology,Guangzhou Guangdong 510640)
出处
《环境卫生工程》
2025年第4期91-98,共8页
Environmental Sanitation Engineering
基金
广东省基础与应用基础研究基金项目(2024A1515012095)。
关键词
复合载氧体
碱金属
生物质
化学链气化
作用机制
composite oxygen carriers
alkali metal
biomass
chemical looping gasification
mechanism
