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Study on fusibility of coal ash rich in sodium and sulfur by synthetic ash under different atmospheres

机译：不同气氛下合成灰分含钠和硫的煤灰易熔性研究

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摘要

Coal ash fusibility is the key parameter related with ash fouling and slagging in boiler and gasifier. The influences of major compositions in coal ash on fusibility are well known, but the ash rich in sodium and sulfur, such as Zhundong coal, is lack of study. Meanwhile, the sodium and sulfur in Zhundong coal lead to severe slagging and ash deposition during thermal utilization. In order to reveal the behavior of sodium and sulfur in ash and its effect on ash fusibility under different atmospheres, two synthetic ashes rich in sodium and sulfur were prepared. Fe2O3 was not included in order to shield its effect on ash fusibility by atmosphere. The results show that ash fusion temperatures (AFTs) of coal ash rich in sodium and sulfur under oxidizing atmosphere are higher than that under reducing atmosphere. The mineral transformation experiments reveal that sodium has an obvious effect on decreasing AFTs under reducing atmosphere due to the formation of fusible Na-containing aluminosilicates. However, under oxidizing atmosphere, a majority of sodium transformed into sodium sulfate (Na2SO4), which was separated out from the slags above 1250 degrees C, leading to a decrease of sodium content in coal ash. The formation of sodium sulfate under the oxidizing atmosphere also depends on the total content of SiO2 and Al2O3 in coal ash. The formation condition of sodium sulfate was further proposed in a ternary diagram. The conclusions supply a theoretical support to evaluate the fusibility of ash rich in sodium and sulfur properly, and also help to prevent slagging and ash deposition by sodium sulfate. (C) 2017 Elsevier Ltd. All rights reserved.
机译：煤灰易熔性是与锅炉和气化炉中灰分结垢和结渣有关的关键参数。煤灰中主要成分对可熔性的影响是众所周知的，但是缺乏钠和硫的灰分，如准东煤，尚缺乏研究。同时，准东煤中的钠和硫在热利用过程中会导致严重的结渣和灰分沉积。为了揭示灰分中钠和硫的行为及其对灰分熔融性的影响，制备了两种富含钠和硫的合成灰。不含Fe2O3是为了屏蔽其对大气灰分熔合性的影响。结果表明，在氧化气氛下，富含钠和硫的煤灰的熔融温度（AFTs）高于还原气氛。矿物转化实验表明，由于可熔的含钠铝硅酸盐的形成，钠在还原气氛下对降低AFT具有明显的作用。然而，在氧化气氛下，大部分钠转化为硫酸钠（Na 2 SO 4），在高于1250摄氏度的炉渣中将其分离出来，导致煤灰中的钠含量降低。氧化气氛下硫酸钠的形成还取决于煤灰中SiO2和Al2O3的总含量。在三元图中进一步提出了硫酸钠的形成条件。这些结论为正确评估富含钠和硫的灰分的易熔性提供了理论支持，也有助于防止硫酸钠产生的结渣和灰分沉积。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第15期|175-183|共9页
  • 作者

    Chen Xiao-Dong; Kong Ling-Xue; Bai Jin; Bai Zong-Qing; Li Wen;

  • 作者单位

    Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China;

    Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China;

    Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China;

    Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, 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

    Ash fusion temperature; Sodium and sulfur; Sodium sulfate; Reducing and oxidizing atmosphere;

    机译：灰分熔融温度钠硫硫酸钠还原氧化气氛;

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