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中南大学学报(自然科学版)

Journal of Central South University

第45卷    第5期    总第237期    2014年5月

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文章编号:1672-7207(2014)05-1692-07
煤与生物质流化床水蒸气共气化
王立群,陈兆生

(江苏大学 能源与动力工程学院,江苏 镇江,212013)

摘 要: 采用单一流化床二步气化方法,以煤作为热载体与发热体,水蒸气作为气化剂,在流化床试验装置上进行生物质(稻壳和木屑)气化的试验研究,考察反应温度(t)、水蒸气与生物质的质量比对燃气组分、氢产率和潜在氢产率的影响。实验结果表明,随着反应温度的升高,H2浓度、氢产率和潜在氢产率都不断增加,而H2与CO体积比逐渐减小;随着水蒸气与生物质的质量比的增大,H2浓度、H2与CO体积比、氢产率和潜在氢产率均不断增加,而CO与CO2体积比呈减小趋势。生产氢的最佳条件:t=1 025 ℃、水蒸气与生物质质量比为2。在最佳条件下,进一步研究了生物质种类对氢产率的影响。木屑气化制氢优于稻壳气化制氢,木屑气化所获得的氢产率(61.7 g H2/kg)约为稻壳气化所获得氢产率(53.4 g H2/kg)的1.2倍。

 

关键词: 煤;可再生能源;流化床;共气化;水蒸气;氢气

Co-gasification of coal and biomass with steam in a fluidized bed gasifier
WANG Liqun, CHEN Zhaosheng

School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China

Abstract:The biomass and coal co-gasification were performed on a fluidized bed gasifier with steam as gasifying agent. Two-stage gasification processes were adopted. Rice husk and sawdust were used as the biomass feedstock for the gasification. This research aims to determine the effects of reactor temperature (t) and steam to biomass mass ratio (m(S)/m(B)) on gas composition, hydrogen yield and potential hydrogen yield, of the product gas. The results show that high reactor temperature leads to higher H2 content, hydrogen yield and hydrogen yield potential of the product gas. The volume ratio of H2 to CO decreases with the increase of reactor temperature. With steam addition, the H2 content, volume ratio of H2 to CO, hydrogen yield, as well as hydrogen yield potential increase, whilst the volume ratio of CO to CO2 decreases correspondingly. The optimum condition for producing hydrogen is: t=1 025 ℃ and m(S)/m(B)=2. The species of biomass used on the hydrogen yield was investigated at the optimum condition .It is found that the product gas from cellulose-rich sawdust has the highest hydrogen yield (61.7 g H2/kg) in comparison to rice husk (53.4 g H2/kg).

 

Key words: coal; renewable energy; fluidized bed; co-gasification; steam; hydrogen

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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