Evaluation of Moisture Readsorption and Combustion Characteristics of a Lignite Thermally Upgraded with the Addition of Asphalt
Evaluation of Moisture Readsorption and Combustion Characteristics of a Lignite Thermally Upgraded with the Addition of Asphalt
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DOI：
10.1021/ef5019115
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发表时间：
2014-12
期刊：
影响因子：
5.3
通讯作者：
Jinping Zhang;Cheng Zhang;Qiu Yongqi;Lei Chen;Tan Peng;Gang Chen
中科院分区：
文献类型：
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作者：
Jinping Zhang;Cheng Zhang;Qiu Yongqi;Lei Chen;Tan Peng;Gang Chen
热提质是一种高效、安全利用褐煤的有效途径。然而，改质褐煤的水分再吸附性能将部分抵消改质效果。沥青具有很强的憎水性，可以作为褐煤热改质的添加剂，防止改质后褐煤的水分再吸附。在这项研究中，中国褐煤升级在不同的温度（200-500 °C）与不同浓度的沥青添加（0-10重量%）进行了彻底的研究。利用傅里叶变换红外光谱（FTIR）研究了褐煤改性前后化学结构的变化。通过N2吸附等温线和扫描电子显微镜（SEM）分析了物理结构的变化。利用恒温恒湿箱和热重分析仪（TGA）分别研究了改性褐煤的吸湿特性和燃烧特性。结果表明，含氧基团的丰度（即，水...
Thermal upgrading is a promising way to use lignite efficiently and safely. However, moisture readsorption properties of the upgraded lignite would partially offset the upgrading effect. Asphalt is so repellent that it could be used as an additive in lignite thermal upgrading to prevent moisture readsorption of upgraded lignite. In this study, a Chinese lignite upgraded at various temperatures (200–500 °C) with various concentrations of asphalt addition (0–10 wt %) was thoroughly investigated. The changes in chemical structures of the upgraded lignites were investigated using Fourier transform infrared spectroscopy (FTIR). The changes in physical structures were analyzed by N2 adsorption isotherm and scanning electron microscopy (SEM). The moisture readsorption and combustion characteristics of the upgraded lignites were studied using a constant temperature/humidity chamber and a thermogravimetric analyer (TGA), respectively. The results indicate that the abundance of oxygen-containing groups (i.e., hydro...