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Influence of sludge properties on the direct gasification of dewatered sewage sludge in supercritical water

机译:污泥特性对超临界水中脱水污泥直接气化的影响

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摘要

In the present study, ten different types of dewatered sewage sludges were treated in supercritical water in a high-pressure autoclave under a given condition (at 400 ℃, 60 min and 23 MPa). The feasibility of direct gasification and the effect of sludge properties on the gasification of dewatered sewage sludge with various properties in supercritical water were investigated. The results showed that dewatered sewage sludge with various water contents (73.48-88.51 wt%), organic matter contents (29.25-73.02 wt %, on dry basis) and inorganics can be directly gasified in supercritical water. The total gas and phenol production increased linearly with the increment of organic matter content in dewatered sewage sludge. The difference in hydrogen content in the gaseous product may be related to the content of water and inorganic as well as pH value of the sludge. The char/coke formed in the solid residue increased with decrement of water content, which inhibited the gasification reaction and resulted in the carbonization reaction.
机译:在本研究中,在给定条件(400℃,60分钟和23 MPa)下,在高压釜中的超临界水中处理了十种不同类型的脱水污泥。研究了直接气化的可行性以及污泥性质对超临界水中各种性质的脱水污泥气化的影响。结果表明,可以在超临界水中直接气化各种含水量(73.48-88.51 wt%),有机物含量(29.25-73.02 wt%,以干基计)和无机物的脱水污泥。随着脱水污泥中有机物含量的增加,天然气和苯酚的总产量线性增加。气态产物中氢含量的差异可能与水和无机物的含量以及污泥的pH值有关。固体残渣中形成的焦炭随着水含量的减少而增加,这抑制了气化反应并导致了碳化反应。

著录项

  • 来源
    《Renewable energy》 |2014年第6期|605-611|共7页
  • 作者单位

    College of Environment, Hohai University, Nanjing 210098, PR China;

    College of Environment, Hohai University, Nanjing 210098, PR China ,National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing, Jiangsu 270098, PR China;

    College of Environment, Hohai University, Nanjing 210098, PR China ,Environmental Policy and Standard Research Department, Environmental Science Research and Design Institute of Zhejiang Province, Hangzhou, Zhejiang 310007, PR China;

    College of Environment, Hohai University, Nanjing 210098, PR China ,National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing, Jiangsu 270098, PR China;

    College of Environment, Hohai University, Nanjing 210098, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sludge property; Supercritical water gasification; Sewage sludge; Phenol; Char/coke;

    机译:污泥性质;超临界水气化;污水污泥;苯酚;炭/焦炭;

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