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首页> 外文期刊>Energy & fuels >Inhibition of Sodium Release from Zhundong Coal via the Addition of Mineral Additives: Online Combustion Measurement with Laser Induced Breakdown Spectroscopy (LIBS)
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Inhibition of Sodium Release from Zhundong Coal via the Addition of Mineral Additives: Online Combustion Measurement with Laser Induced Breakdown Spectroscopy (LIBS)

机译：通过添加矿物添加剂抑制准东煤中的钠释放：激光诱导击穿光谱法（LIBS）在线燃烧测量

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摘要

Zhundong coal represents a large portion of China's future energy supply, because of the large reserve capacity. Although Zhungdong coal has low ash and good ignition characteristics, it also contains large amounts of sodium, which can foul and corrode heat-transfer surfaces. For economically viable use of Zhundong coal or other high-alkali coals, the alkali release must be mitigated prior to or within the burner. This can be done either by washing the coal,, using sorbents to trap the sodium, or a combination of these methods. Additive influence on the release of sodium over the entire coal combustion process was measured using a calibrated laser-induced breakdown spectroscopy (LIBS) technique. The additives used were alumina, silica, and five mineral sorbents comprising blends of silica, alumina, and various other inorganic compounds; different coal/sorbent ratios were assessed (1%, 3%, and 5% additive, by weight). During the three stages of sample coal combustion, it was found that the first stage, devolatilization, releases only similar to 1.2% of the total sodium; the char combustion stage releases similar to 28% of the total sodium; and the ash stage releases the vast majority of sodium (similar to 70%). The peak instantaneous release rate occurs during the char combustion stage. The sodium retention efficiency for all of the sorbents tested was lowest during the devolatilization stage and there was no appreciable change to the duration of the stage. Sodium retention efficiency was greatest in the ash stage, primarily due to the sheer amount of sodium released during this stage. The ash stage was effectively shortened, in proportion to the retention efficiency of the sorbent. The sodium release during the char combustion stage showed an obvious difference in profile for the various types of sorbent tested. Alumina was the least effective in reducing sodium release and retained the characteristic shape of sodium release from raw coal during this stage. Silica and sepiolite demonstrated similar sodium release profiles, which were markedly different than the sodium release profiles of either alumina or aluminosilicate mineral samples. Time-resolved sodium retention plots show an enhancement in the sodium retention by alumina during the char burnout. The addition of sodium sorbent to the coal extended the duration of the char burnout stage, which may indicate that the reduction of available sodium reduces the alkali catalysis of the char decomposition.
机译：由于储量巨大，准东煤炭占中国未来能源供应的很大一部分。尽管准东煤具有较低的灰分和良好的着火特性，但它也含有大量的钠，这些钠会污染和腐蚀传热表面。为了使准东煤或其他高碱煤在经济上可行地使用，必须在燃烧器之前或之内减少碱的释放。这可以通过洗涤煤，使用吸附剂捕获钠的方法或结合使用这些方法来完成。使用校准的激光诱导击穿光谱（LIBS）技术测量了整个煤燃烧过程中钠释放的附加影响。使用的添加剂是氧化铝，二氧化硅和五种矿物吸附剂，其中包括二氧化硅，氧化铝和各种其他无机化合物的混合物。评估了不同的煤/吸附剂比率（按重量计分别为1％，3％和5％的添加剂）。在样品煤燃烧的三个阶段中，发现第一阶段（脱挥发分）仅释放约占总钠的1.2％；而脱挥发分仅占总钠的1.2％。炭燃烧阶段释放的钠占总钠的28％左右；灰分阶段释放出绝大多数的钠（约占70％）。峰值瞬时释放速率发生在炭燃烧阶段。在脱挥发分阶段，所有测试的吸附剂的钠保留效率最低，并且该阶段的持续时间没有明显变化。在灰分阶段，钠的保留效率最高，这主要是由于在此阶段释放出的大量钠。与吸附剂的保留效率成比例，有效地缩短了灰分阶段。在炭燃烧阶段，所测试的各种类型的吸附剂的钠释放在轮廓上显示出明显的差异。在此阶段，氧化铝在减少钠释放方面效果最差，并且保留了原煤中钠释放的特征形状。二氧化硅和海泡石显示出相似的钠释放曲线，这与氧化铝或铝硅酸盐矿物样品的钠释放曲线明显不同。时间分辨的钠保留曲线显示了炭烧尽期间氧化铝对钠的保留增加。向煤中添加钠吸附剂可延长炭烧尽阶段的持续时间，这可能表明有效钠的减少会降低炭分解的碱催化作用。

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  • 来源
    《Energy & fuels》 |2017年第2期|1082-1090|共9页
  • 作者

    He Yong; Whiddon Ronald; Wang Zhihua; Liu Yingzu; Zhu Yanqun; Liu Jianzhong; Cen Kefa;

  • 作者单位

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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