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准东煤掺烧高岭土对固钠率及灰熔融特性影响研究

沈铭科 ,  邱坤赞 ,  黄镇宇 ,  王智化 ,  刘建忠

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引用本文: 沈铭科, 邱坤赞, 黄镇宇, 王智化, 刘建忠. 准东煤掺烧高岭土对固钠率及灰熔融特性影响研究[J]. 燃料化学学报, 2015, 43(9): 1044-1051. shu
Citation:  SHEN Ming-ke, QIU Kun-zan, HUANG Zhen-yu, WANG Zhi-hua, LIU Jian-zhong. Influence of kaolin on sodium retention and ash fusion characteristic during combustion of Zhundong coal[J]. Journal of Fuel Chemistry and Technology, 2015, 43(9): 1044-1051. shu

准东煤掺烧高岭土对固钠率及灰熔融特性影响研究

    通讯作者: 邱坤赞,E-mail:qiukz@zju.edu.cn。
  • 基金项目:

    国家重点基础研究发展规划(973计划, 2012CB214906)。 (973计划, 2012CB214906)

摘要: 选择常见的黏土矿物高岭土作为准东煤添加剂掺烧,研究了不同掺混比例、不同燃烧温度下添加剂的固钠率和煤灰熔融特性的变化,结合XRD谱图和三元相图研究了灰中矿物在高温下的演变过程。结果表明,固钠率随高岭土掺混比例增加逐渐增大,在0~2%时增长较快,2%~5%增长较慢,随燃烧温度升高略微下降;掺混后煤灰熔点随掺混比例先缓慢减小,再快速减小,后快速增加,在3%时达到1 200 ℃左右;XRD和三元相图分析结果表明,煤灰熔融特性变化是由于灰中硅钙石、钙黄长石和钙长石矿物比例的变化引起,发生低温共熔现象是导致掺混比例为3%和4%时煤灰熔点最低的主要原因;当掺混比例为2%时,固钠率在60%以上且灰熔点在1 300 ℃左右,利于固态排渣,当掺混比例为3.0%~4.0%时,灰熔点在1 200 ℃左右,利于液体排渣。

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