串行流化床生物质气化制取富氢气体模拟研究  

HYDROGEN PRODUCTION FROM BIOMASS GASIFICATION IN INTERCONNECTED FLUIDIZED BEDS

作　　者：高杨[1] 肖军[1] 沈来宏[1] 

机构地区：[1]东南大学热能工程研究所,南京210096

出　　处：《太阳能学报》2008年第7期894-899,共6页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(50306002);国家自然科学基金重大项目(20590067);国家重点基础研究发展规划项目(2003CB214500;2007CB210208)

摘　　要：利用串行流化床技术将生物质热解气化和燃烧过程分开,气化反应器和燃烧反应器之间通过灰渣进行热量传递,实现了自供热下生物质气化制氢。利用Aspen Plus软件模拟制氢过程,通过比较单反应器生物质气化的模拟结果和实验结果,验证了模拟研究的可行性。重点研究串行流化床中非催化气化与CaCO_3作用下的气化过程,探讨了气化温度、蒸汽与生物质的质量配比(S/B)对制氢的影响,为今后开展生物质气化制氢试验提供了理论参考。结果表明:对应不同气化温度,S/B都存在一个最佳值,且随着温度升高其值减小。当气化温度低于750℃时,添加CaCO_3可大幅提高氢产率,气化温度为700℃在S/B约为0.9时氢产率最大,达43.7mol·(kg生物质)^(-1)(干燥无灰基),比同温度下非催化气化提高了20.3%。随着气化温度升高,CaCO_3促进作用减弱。Interconnected fluidized beds technology was used to separate gasification and combustion of biomass, heat was transferred from combustor to gasifier by ash, and hydrogen production from biomass without extra heat was carried out in this way. Aspen Plus software was used to establish the model and simulate the process, comparison of simulant and experimental results of biomass gasification in a single reactor was studied to verify the feasibility of the simulation. In conditions whether CaCO3 was added to the process or not, the effects of gasification temperature and steam to biomass ratio （S/B） on hydrogen production were discussed. This paper provides a theoretic reference for future experiments on biomass hydrogen production. The results showed that there are optimal values of S/B correspond to different gasification temperatures, and the value decreases as temperature increases. Hydrogen yield can be improved greatly by CaCO3 when temperature is below 750℃, and when the temperature is 700℃ and S/B is about 0.9, it could reach the maximum of 43.7 mol· kg^- 1 of dry ash-free biomass, which is 20.3 % higher than the process without CaCO3. However, the effect of CaCO3 weakens as the temperature increases.

关 键 词：生物质气化 制氢 串行流化床 模拟 

分 类 号：TK6[动力工程及工程热物理—生物能]