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澳大利亚高盐煤中钠在热解过程中的形态变迁 预览 被引量:42

Transformation of Na in an Australian high-sodium coal during pyrolysis
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摘要 通过对高钠煤进行水洗以及0.1 mol/L的HCl洗涤,并在固定床上考察了不同洗煤热解后的半焦中Na的挥发性及其形态变迁。热解后的半焦用水和0.1 mol/L的HCl逐级萃取,将热解半焦中的钠分为水溶态钠,水不溶但酸溶态钠以及酸不溶态钠。研究结果表明,实验煤中的钠大部分是以水溶态的NaCl盐形式存在,在500℃~550℃由于以羧酸盐形式存在的有机钠以钠原子的形式释放使得在该温度范围内钠的挥发性出现极大值,而酸洗煤由于在600℃以上有一部分酸不溶态的钠转化为水不溶但酸溶态的钠,使得钠的挥发性又有所增加。原煤中的可挥发钠热解后少部分在高温下会转化为水溶态的钠,而水洗煤中的钠随着热解温度的升高与SiO2反应转化为硅酸盐形式存在的酸不溶态的钠。 The volatility and transformation of Na in raw coals and washed coals by water and 0.1 mol/L HCl during coal pyrolysis were investigated in a fixed bed from 400 ℃ to 700 ℃ and atmospheric pressure.The semi-chars were extracted by water and 0.1 mol/L HCl,and the forms of Na were divided into three parts: water soluble,acid soluble but water insoluble and acid insoluble.The results show that Na in the raw coal is mostly water soluble NaCl.The Na volatility shows a maximum value between 500 ℃~550 ℃ because the organic Na as the carboxylic salt releases as atom Na.However,above 600 ℃ the Na in acid washed coal transforms into acid soluble but water insoluble,leading to the volatility of Na to increase again.It is found that at higher pyrolysis temperatures the volatile Na in the raw coal is transformed into water soluble;however,the Na in water washed coal may react with SiO2 to transform into acid insoluble Na.
作者 卫小芳 刘铁峰 黄戒介 房倚天 王洋 WEI Xiao-fang,LIU Tie-feng,HUANG Jie-jie,FANG Yi-tian,WANG Yang (1.Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China)
出处 《燃料化学学报》 EI CAS CSCD 北大核心 2010年第2期 144-148,共5页 Journal of Fuel Chemistry and Technology
基金 国家重点基础研究发展规划(973计划 2005CB221200) 国家高技术研究发展计划(863计划 2007AA050302)
关键词 高钠煤 变迁 热解 higher-sodium coal transformation pyrolysis
作者简介 作者简介:卫小芳(1977-),女,山西运城人,博士研究生,化学工程专业。E—mail:weixf@sxicc.ac.cn。
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