Characteristics of alkali species release from a burning coal/biomass blend
Characteristics of alkali species release from a burning coal/biomass blend
复制标题
燃烧煤/生物质混合物中碱物质释放的特征
DOI：
10.1016/j.apenergy.2018.02.015
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发表时间：
2018-04
期刊：
影响因子：
11.2
通讯作者：
Cen Kefa
中科院分区：
文献类型：
--
作者：
Liu Yingzu;He Yong;Wang Zhihua;Xia Jun;Wan Kaidi;Whiddon Ronald;Cen Kefa
采用溶剂分馏、激光诱导击穿光谱（LIBS）、X射线衍射（XRD）和化学分析等手段，对准东煤和玉米秸秆的二元混合燃料进行了研究，考察了煤与生物质混烧过程中碱金属物种的释放特性。随着生物质比例的增加，水溶性，NH 4Ac-可溶性和HCl-可溶性碱物质相互转化;转化的程度取决于共混物的组成。从LIBS测量中发现，添加生物质加速燃烧和放气过程。混合物中生物质的比例越高，碱的峰值浓度出现越早，钠和钾的峰值浓度的幅度分别减小和增大。此外，煤和生物质之间的相互作用可以产生晶体，导致共晶熔融现象（类似于XRD结果中的长石），这导致灰熔融温度（AFT）急剧下降。研究结果不仅为褐煤与农用生物质混烧提供了基础性的转化信息，而且对褐煤与农用生物质混烧的工业应用具有指导意义。
Solvent fractionation, Laser induced breakdown spectroscopy (LIBS), X-ray Diffraction (XRD) and chemical analysis were applied to binary fuel mixtures of Zhundong coal and cornstalk agricultural class to investigate the release characteristics of alkali species during co-firing of coal and biomass. As the biomass proportion increases, the water-soluble, NH4Ac-soluble and HCl-soluble alkali species interconvert; the extent of the conversion depends on the composition of the blend. From LIBS measurements, it was found that adding the biomass accelerates combustion and outgassing processes. The higher the proportion of the biomass in the blend, the earlier the peak concentrations of alkali appear, and the magnitude of peak concentrations of sodium and potassium decrease and increase, respectively. Furthermore, the interaction between coal and biomass can generate crystals causing the eutectic melting phenomenon (similar to feldspar in XRD results), which results in a sharp decline of the ash fusion temperatures (AFTs). The results not only provide the information of fundamental transformation but also guide industrial co-firing applications of lignite and agricultural class biomass to reduce the risk of ash deposition.
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