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Study on the ash fusion temperatures of coal and sewage sludge mixtures

机译：煤与污水污泥混合物的灰分熔融温度研究

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摘要

The coal, sewage sludge, water and chemical additives are milled to produce coal-sludge slurry as a substitute for coal-water slurry in entrained-flow gasification, co-gasification of coal and sewages sludge can be achieved. The ash fusion temperature is an important factor on the entrained-flow gasifier operation. In this study, the ash fusion temperatures (DT, ST, HT and FT) of three kinds of coals (A, B and C), two kinds of sewage sludges (W1 and W2) and series of coal-sewage blends were determined, and the mineral composition during the ash melting process was analyzed by X-ray diffraction (XRD). The results showed that the ash fusion temperatures of most coal-sewage blends are lower than those of the coals and sewage sludges. The ashes have different mineral composition at different temperature during the heating process. It was found that the mineral composition of AW1 blend ash is located in the low-temperature eutectic region of the ternary phase diagram of SiO_2-Al_2O_3-CaO. The minerals found in BW1 blend ash are almost the same as those in B coal ash. Kyanite is detected in CW1 blend ash, which results in the ash fusion temperatures of CW1 blend ash higher than those of C coal. We found that sodium mineral matters are formed because of NaOH added to W2, which can reduce the ash fusion temperature of coal-sewage blends.
机译：将煤，污水污泥，水和化学添加剂进行研磨，以生产煤泥浆，代替气流床气化中的煤水浆，可以实现煤和污水污泥的共气化。灰分熔融温度是气流床气化炉运行的重要因素。在这项研究中，确定了三种煤（A，B和C），两种污水污泥（W1和W2）以及一系列煤污水混合物的灰分熔化温度（DT，ST，HT和FT），利用X射线衍射（XRD）分析了灰分熔化过程中的矿物成分。结果表明，大多数煤-污水混合物的灰熔融温度低于煤和污水污泥的熔融温度。在加热过程中，灰分在不同温度下具有不同的矿物成分。发现AW1混合灰的矿物成分位于SiO_2-Al_2O_3-CaO三元相图的低温共晶区域。 BW1混合灰中发现的矿物与B煤灰中的矿物几乎相同。在CW1混合灰中检测到蓝晶石，这导致CW1混合灰的灰熔融温度高于C煤。我们发现，由于向W2中添加了NaOH而形成了钠矿物质，这可以降低煤污水混合物的灰熔融温度。

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  • 来源
    《Fuel》 |2010年第7期|p.1566-1572|共7页
  • 作者

    Li Weidong; Li Ming; Li Weifeng; Liu Haifeng;

  • 作者单位

    Key Laboratory of Coal Gasification of Ministry of Education, East China University of Science and Technology, P.O. Box 272, Shanghai 200237, People's Republic of China;

    rnKey Laboratory of Coal Gasification of Ministry of Education, East China University of Science and Technology, P.O. Box 272, Shanghai 200237, People's Republic of China;

    rnKey Laboratory of Coal Gasification of Ministry of Education, East China University of Science and Technology, P.O. Box 272, Shanghai 200237, People's Republic of China;

    rnKey Laboratory of Coal Gasification of Ministry of Education, East China University of Science and Technology, P.O. Box 272, Shanghai 200237, People's Republic of 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

    coal-sludge slurry; Co-gasification; ash fusion temperature; mineral matter; XRD;

    机译：煤泥浆;共气化;灰熔融温度矿物质X射线衍射;

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