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生物质空气-水蒸气气化制取合成气热力学分析
引用本文:冯杰,吴志斌,秦育红,李文英.生物质空气-水蒸气气化制取合成气热力学分析[J].燃料化学学报,2007,35(4):397-400.
作者姓名:冯杰  吴志斌  秦育红  李文英
作者单位:Key Laboratory of Coal Science and Technology of Shanxi Province and Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
基金项目:国家重点基础研究发展计划(973计划);教育部创新团队发展基金;教育部跨世纪优秀人才培养计划;山西省自然科学基金
摘    要:基于Gibbs自由能最小化原理,计算了包括H2O(l)和C(s)在内的,生物质空气 水蒸气气化体系热力学平衡,对比分析了常压气化和加压气化的特点,通过回归分析得到了不同压力下,气化产物中可燃气体分率最高时的水蒸气/生物质质量比(S/B,Steam to Biomass Ratio)与空气当量比(ER,Equivalence Ratio)的关系曲线,为探讨适于制取合成气的气化工艺和条件提供初步的理论指导。研究表明,相对于常压气化,加压气化体系的平衡温度较高,平衡状态下可燃气体分数较低,但CH4含量明显增加;一定温度和当量比下,加压气化使得气化产物中可燃气体分数达到最高所对应的S/B比增大,即需要消耗更多水蒸气;通过调节S/B比,可以比较方便地控制产物中H2和CO的比例。以常压为例,T=1173K,S/B=0.17时,气化产物中H2/CO约为1.1∶1,而S/B=1.02时,气化产物中H2/CO约为2∶1;不同压力下最佳S/B比和ER有很好的线性关系,温度为1173K时,最佳S/B比与压力及ER〖的关系为S/B=-1.48×ER-4.49 E×10-5×p2 + 5.83 E×10-3×p + 0.32。

关 键 词:生物质  气化  合成气  热力学  Gibbs自由能  
文章编号:0253-2409(2007)04-0397-04
收稿时间:2007-01-09
修稿时间:2007年1月9日

Thermodynamics analysis of biomass gasification with air-steam
FENG Jie,WU Zhi-bin,QIN Yu-hong,LI Wen-ying.Thermodynamics analysis of biomass gasification with air-steam[J].Journal of Fuel Chemistry and Technology,2007,35(4):397-400.
Authors:FENG Jie  WU Zhi-bin  QIN Yu-hong  LI Wen-ying
Abstract:Based on the Gibbs energy minimization method, biomass gasification with air steam through thermodynamics method was analyzed to get the relationship between reaction conditions and the products gas compositions. The gasification features under both atmospheric pressure and elevated pressure were computed contrastively. The correlation curve of steam to biomass ratio (S/B), which corresponds to the maximum fraction of fuel gas, and equivalence ratio (ER) under different pressures was obtained through statistic regression analysis. The computation shows that compared with gasification under atmospheric pressure, the equilibrium temperature is higher in pressurized system, and the molar fraction of fuel gas is relatively lower while methane content increases remarkably. The S/B increases with increasing pressure. More Steam is needed for pressurized gasification. By adjusting S/B, different H2/CO ratios can be obtained. The ratio of H2/CO is approximately 2 both under atmospheric and 5.0MPa pressure in the computations, in which T=1173K and S/B=1.02. The optimal S/B has a perfect linearity with ER under different pressures. As temperature equals to 1173K, the relationship of the optimal S/B and ER and pressure is expressed as following: S/B=-1.48×ER-4.49 E×10-5×p2 + 5.83 E×10-3×p + 0.32.
Keywords:thermodynamics  gasification  syngas  Gibbs free energy  
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