Influence of leaching pretreatment on fuel properties of biomass
Influence of leaching pretreatment on fuel properties of biomass
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DOI：
10.1016/j.fuproc.2014.06.030
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发表时间：
2014-12
影响因子：
7.5
通讯作者：
Chaowei Yu;P. Thy;Li Wang;S. N. Anderson;J. VanderGheynst;S. Upadhyaya;B. Jenkins
中科院分区：
文献类型：
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作者：
Chaowei Yu;P. Thy;Li Wang;S. N. Anderson;J. VanderGheynst;S. Upadhyaya;B. Jenkins
燃料成分的改性可以减少热化学转化系统的灰垢和结渣、腐蚀以及环境影响。浸出被用作原料预处理，以改善选定的农业、林业和能源作物生物质的特性，包括稻草、麦秆、玉米秸秆、柳枝稷、芒草、何塞高麦草和花旗松木。对粗固体和浸出固体的灰熔融性、热值、主要元素浓度和其他特性的变化进行了表征。对渗滤液进行了主量元素、微量元素和有机物质的分析。在所有情况下，灰分含量均显着降低，尽管由于残留固体成分可能发生变化，同时提取无机和有机材料会导致燃料特性变得更加复杂。因此，灰分浓度的下降并不总是伴随着热值的增加或初始灰分熔化温度的提高，尽管在所有情况下熔体流动温度都会增加，在某些情况下增加超过 500°C。熔融行为的趋势通常是使用减少的灰成分从相平衡来预测的。糖（1.5 – 103.5 mg/g 干物质）和有机酸（0.6 – 57.6 mg/g 干物质）构成了已鉴定的有机提取物的主要部分，并且可能具有回收副产品的潜力。
Modification of fuel compositions can reduce ash fouling and slagging, corrosion, and environmental impacts for thermochemical conversion systems. Leaching was used as a feedstock pretreatment to improve the properties of selected agricultural, forestry, and energy crop biomass, including rice straw, wheat straw, corn stover, switchgrass, Miscanthus, Jose tall wheatgrass, and Douglas fir wood. Crude and leached solids were characterized for changes in ash fusibility, heating value, major element concentrations, and other properties. Leachates were analyzed for major and trace elements and organic species. Ash contents were in all cases significantly reduced although simultaneous inorganic and organic material extraction led to more complex outcomes in fuel properties due to possible changes in the composition of residual solids. Declines in ash concentrations were therefore not always accompanied by increases in heating value or improvements in initial ash melting temperatures, although melt flow temperatures in all cases increased, in some cases by more than 500 °C. The trends in melt behavior are generally predicted from phase equilibria using reduced ash compositions. Sugars (1.5 – 103.5 mg/g dry matter) and organic acids (0.6 – 57.6 mg/g dry matter) constituted the major fractions of the identified organic extracts and may have potential for coproduct recovery.