摘要
林业生物质作为一种独特的碳基可再生能源资源,其气化制氢技术的开发对于我国减少对化石能源的依赖、强化能源安全以及推进碳达峰与碳中和目标的实现非常重要.鉴于生物质气化制氢技术路径的多样性,基于热力学原理的深入评估与工艺优化显得尤为重要,旨在实现林业生物质资源的高效转化与低成本绿色氢能的制备.本研究以典型林业生物质——松木屑作为原料,运用Aspen plus软件平台,构建了变压吸附生物质气化制氢系统模型.在气化工艺中,采用控制变量法,系统地探讨了氧当量比、气化温度及水气比等关键参数对氢气产量、热蒸汽生成量及系统电耗的综合影响.文章通过数据分析与比较,确定了气化温度850℃、氧当量比 0.30、水气比 0.1 为本研究最优工况.燃气组分中氢气含量高达27.21%,伴随生成一氧化碳(33.15%)、二氧化碳(20.97%)、水蒸气(18.60%)、氮气(0.06%)及微量甲烷.变压吸附工艺产生的氢气体积数较大,为 94.36 m3/h,且氢气较为纯净,但整个系统消耗电量相对较高,为42.57 kW·h.综上所述,本研究可以为林业生物质气化制氢技术的工艺优化提供数据支持与理论依据.
Abstract
Forest biomass as a unique renewable carbon energy resource,its development of forest biomass gasification for hydrogen production is particularly important for China to reduce its dependence on fossil fuels,enhance energy se-curity,and achieve carbon peaking and neutrality goals.Given the diverse pathways of biomass gasification for hydro-gen production,a thorough evaluation and process optimization based on thermodynamic principles are particularly im-portant to achieve efficient conversion of forest biomass resources and low-cost production of green hydrogen.This study chosed sawdust as raw material,and utilized the Aspen plus software platform to construct a model of a variable pres-sure adsorption biomass gasification hydrogen production system.By using a control variable method in the gasification process,the study systematically investigated the comprehensive impact of key parameters such as oxygen equivalence ratio,gasification temperature,and steam-gas ratio on hydrogen production,heat steam generation,and system power consumption.Through detailed data analysis and comparison,it was determined that under the optimized conditions of a gasification temperature of 850℃,oxygen equivalence ratio of 0.3,and steam-to-gas ratio of 0.1,the process could achieve optimal performance.At this point,the hydrogen content in the gas composition was as high as 27.21%,ac-companied by carbon monoxide(33.15%),carbon dioxide(20.97%),steam(18.60%),nitrogen(0.06%),and trace amounts of methane.The variable pressure adsorption process generated a large volume of hydrogen gas,reaching 94.36 m3/h,with relatively high purity,but the entire system consumed a relatively high amount of electricity,at 42.57 kW·h.In conclusion,this study provides detailed data support and theoretical basis for process optimization of forest biomass gasification for hydrogen production.
基金项目
国家自然科学基金(22208164)
江苏省高等学校自然科学研究项目(22KJB470017)
江苏省研究生科研与实践创新计划(KYCX24_1298)
NETL
NSTL
万方数据