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Comparison of atmospheric pressure and gas-pressurized torrefaction of municipal sewage sludge: Properties of solid products

机译：城市污水污泥大气压和气体加压的比较：固体产品的性能

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摘要

Gas-pressurized (GP) and atmospheric (AP) torrefaction of municipal sewage sludge were carried out under pure nitrogen and 9%-oxygen nitrogen atmosphere, in order to investigate the effects of reactor and oxygen content on the physicochemical properties, combustion/pyrolysis characteristics and heavy metal availability of solid products. Compared with the solid products from AP torrefaction, the GP torrefied sludge had higher ash content, lower H/C ratio and better hydrophobicity. The oxidative torrefaction produced torrefied sludge of similar properties (except for higher heating value) as normally torrefied sludge in AP and GP, respectively. The activation energy (Ea) required for torrefied sewage sludge (TSS) pyrolysis was 23.56-37.07 kJ/mol by the Coats-Redfern method. Comprehensive combustion characteristics of GP torrefied sewage sludge obtained at torrefaction temperature of 200 degrees C were much higher than those obtained at torrefaction temperature of 300 degrees C. Interestingly, GP torrefaction can significantly promote the transformation of heavy metals (e.g. Pb, Zn and Cd) into the residual fraction. The secondary interaction between volatiles and solids in GP torrefaction via gas-pressure-induced deoxygenation behavior dominated the difference of derived-solid products from GP torrefaction and AP torrefaction.
机译：在纯氮气和9％-OXYGEN氮气氛下进行气体加压（GP）和大气（AP）的污水（AP）Torrefaction在纯氮气和9％-Oxygen氮气氛下进行，以研究反应器和氧含量对物理化学性质，燃烧/热解特性的影响固体产品的重金属可用性。与AP烘焙的固体产物相比，GP泪水污泥具有更高的灰分含量，低于H / C比和更好的疏水性。氧化的渗流使得在AP和GP中通常产生的类似性质（更高的加热值除外）产生的雾化污泥（除了较高的加热值除外）。涂层污水污泥（TSS）热解所需的活化能量（EA）是涂层 - Reffern方法的23.56-37.07 kJ / mol。在200摄氏度的烘焙温度下获得的GP Torrefied污泥的综合燃烧特性远高于300摄氏度的烘焙温度下获得的污泥。有趣的是，GP烘焙可以显着促进重金属的转化（例如Pb，Zn和Cd）进入残留部分。通过气压诱导的脱氧行为在GP烘焙中挥发物和固体之间的二次相互作用主要从GP烘焙和AP烘焙中占据了衍生固体产物的差异。

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  • 来源
    《Energy Conversion & Management》 |2020年第6期|112793.1-112793.10|共10页
  • 作者

    Li Miao; Wang Hou; Huang Zhongliang; Yuan Xingzhong; Tan Mengjiao; Jiang Longbo; Wu Zijian; Qin Xiaoli; Li Hui;

  • 作者单位

    Hunan Univ Coll Environm Sci & Engn Changsha 410082 Hunan Peoples R China|Hunan Univ Key Lab Environm Biol & Pollut Control Minist Educ Changsha 410082 Hunan Peoples R China|Hunan Acad Forestry Inst Biol & Environm Engn Changsha 410004 Peoples R China|Hunan Acad Forestry State Key Lab Utilisat Woody Oil Resource Changsha 410004 Peoples R China;

    Hunan Univ Coll Environm Sci & Engn Changsha 410082 Hunan Peoples R China|Hunan Univ Key Lab Environm Biol & Pollut Control Minist Educ Changsha 410082 Hunan Peoples R China;

    Hunan Acad Forestry Inst Biol & Environm Engn Changsha 410004 Peoples R China|Hunan Acad Forestry State Key Lab Utilisat Woody Oil Resource Changsha 410004 Peoples R China;

    Hunan Univ Coll Environm Sci & Engn Changsha 410082 Hunan Peoples R China|Hunan Univ Key Lab Environm Biol & Pollut Control Minist Educ Changsha 410082 Hunan Peoples R China;

    Hunan Acad Forestry Inst Biol & Environm Engn Changsha 410004 Peoples R China|Hunan Acad Forestry State Key Lab Utilisat Woody Oil Resource Changsha 410004 Peoples R China|Hunan Agr Univ Coll Resource & Environm Changsha 410128 Peoples R China;

    Hunan Univ Coll Environm Sci & Engn Changsha 410082 Hunan Peoples R China|Hunan Univ Key Lab Environm Biol & Pollut Control Minist Educ Changsha 410082 Hunan Peoples R China;

    Hunan Acad Forestry Inst Biol & Environm Engn Changsha 410004 Peoples R China|Hunan Acad Forestry State Key Lab Utilisat Woody Oil Resource Changsha 410004 Peoples R China;

    Hunan Acad Forestry Inst Biol & Environm Engn Changsha 410004 Peoples R China|Hunan Acad Forestry State Key Lab Utilisat Woody Oil Resource Changsha 410004 Peoples R China;

    Hunan Acad Forestry Inst Biol & Environm Engn Changsha 410004 Peoples R China|Hunan Acad Forestry State Key Lab Utilisat Woody Oil Resource Changsha 410004 Peoples R 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

    Municipal sewage sludge; Torrefaction; Oxidation; Combustion characteristics; Pyrolysis kinetics; Heavy metal;

    机译：市政污水污泥;烘焙;氧化;燃烧特性;热解动力学;重金属;

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