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Isothermal hot air drying behavior of municipal sewage sludge briquettes coupled with lignite additive

机译：城市污水污泥团块与褐煤添加剂的等温热风干燥行为

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摘要

Isothermal drying behaviors of the municipal sewage sludge briquettes were investigated based on a laboratory-scale hot air forced convective dryer at 1.5 m s(-1) air speed. The influences of drying temperatures (60-180 degrees C) and lignite as a typical additive with 10% dosage on the drying kinetics of the sewage sludge were highlighted. A considerable shrinkage and cracking of the sewage sludge briquettes presented in the drying process, and there were many hollow cavities formed in the final drying stages. The average drying rates of the sewage sludge/lignite blend in the whole falling rate periods were higher than that of the raw sewage sludge. The Midilli models gave good agreement between experimental and predicted moisture ratios of the raw sewage sludge or sewage sludge/lignite blend with the highest R-2. The apparent activation energies of the raw sewage sludge or sewage sludge/lignite blend in the first falling rate periods were higher than that in the second falling rate periods. Adding lignite could obviously improve the drying behavior of the sewage sludge briquettes over 120 degrees C. (C) 2015 Elsevier Ltd. All rights reserved.
机译：基于实验室规模的热风对流干燥机，以1.5 m s（-1）的风速研究了市政污水污泥团块的等温干燥行为。强调了干燥温度（60-180摄氏度）和褐煤作为典型添加剂（添加量为10％）对污水污泥干燥动力学的影响。干燥过程中出现的污泥团块明显收缩和开裂，在最后的干燥阶段中形成了许多空心空腔。在整个下降速率期间，污水污泥/褐煤混合物的平均干燥速率高于原始污水污泥。 Midilli模型在R-2最高的原始污水污泥或污水污泥/褐煤混合物的实验和预测水分比之间取得了很好的一致性。在第一下降速率阶段中，原始污水污泥或污水污泥/褐煤混合物的表观活化能高于第二下降速率阶段的表观活化能。添加褐煤显然可以改善120℃以上的污泥团块的干燥性能。（C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2016年第may1期|108-115|共8页
  • 作者

    Zhang X. Y.; Chen M. Q.; Huang Y. W.; Xue F.;

  • 作者单位

    Beijing Jiaotong Univ, Inst Thermal Engn, Sch Mech Elect & Control Engn, Beijing 100044, Peoples R China|Beijing Key Lab Flow & Heat Transfer Phase Changi, Beijing 100044, Peoples R China;

    Beijing Jiaotong Univ, Inst Thermal Engn, Sch Mech Elect & Control Engn, Beijing 100044, Peoples R China|Beijing Key Lab Flow & Heat Transfer Phase Changi, Beijing 100044, Peoples R China;

    Beijing Jiaotong Univ, Inst Thermal Engn, Sch Mech Elect & Control Engn, Beijing 100044, Peoples R China|Beijing Key Lab Flow & Heat Transfer Phase Changi, Beijing 100044, Peoples R China;

    Guodian Sci & Technol Res Inst, Nanjing 210033, Jiangsu, 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

    Sewage sludge; Lignite; Drying; Isothermal kinetics; Forced convection;

    机译：污泥褐煤干燥等温动力学强迫对流;

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