Curing temperature effect on mechanical strength of smokeless fuel briquettes prepared with molasses
Curing temperature effect on mechanical strength of smokeless fuel briquettes prepared with molasses
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DOI：
10.1016/s0016-2361(02)00416-7
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发表时间：
2003-05
期刊：
影响因子：
7.4
通讯作者：
M. Blesa;J. Miranda;M. Izquierdo;R. Moliner
中科院分区：
文献类型：
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作者：
M. Blesa;J. Miranda;M. Izquierdo;R. Moliner
以低品位煤和橄榄核为生物质，制备了环境可接受的无烟燃料型煤。本研究选用的粘结剂为糖蜜，作为化学型和母体型，其作用不同。采用傅里叶变换红外光谱、程序升温分解(TPD)、在线质谱分析和光学显微镜等手段研究了焙烧温度对型煤的影响。与红外光谱分析相比，TPD实验有助于更清楚地预测型煤的最终性质。固化过程中脂肪族结构和甲氧基减少，氢键减少。另一方面，由于固化温度的影响而产生的氧化作用，容易形成羧基。在200℃、2小时固化的型煤具有最高的机械强度。这些固化条件还可以生产防水型煤，因为羧基的存在有助于型煤的稳定，因为氢键的形成。
Environmental acceptable smokeless fuel briquettes have been prepared with a low-rank coal and olive stone as biomass. The binder chosen for this study was molasses which acts with different roles, as chemical and matrix type. The effect of the curing temperature on these briquettes has been studied by Fourier transform infrared spectroscopy, temperature programmed decomposition (TPD) followed on-line by mass spectrometry and optical microscopy. TPD experiments help to predict the final properties of the briquettes more clearly than infrared spectroscopy. The aliphatic structures and methoxy groups as well as the hydrogen bonds decrease during the curing. On the other hand, the carboxylic groups tend to be formed due to the oxidation produced by the effect of curing temperature. In addition, the briquettes cured at 200°C, 2h showed the highest mechanical strength. These curing conditions also produce waterproof briquettes due to the presence of carboxylic groups which contribute to the stabilisation of the briquettes because of the formation of hydrogen bonds.