Ash chemistry and mineralogy of an Indonesian coal during combustion
Ash chemistry and mineralogy of an Indonesian coal during combustion
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DOI：
10.1016/j.fuproc.2007.12.002
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发表时间：
2008-06
影响因子：
7.5
通讯作者：
H. Vuthaluru;D. French
中科院分区：
文献类型：
--
作者：
H. Vuthaluru;D. French
该论文报告了对低阶印度尼西亚煤在燃烧过程中所经历的灰分化学和矿物学变化的系统和全面的实验室研究。在落管式炉中进行的燃烧实验包括在 1200–1400°C 范围内严格控制的条件下进行的灰分形成实验（使用旋风分离器和过滤器布置）以及在 750°C 探针温度下的沉积实验。对原煤、煤/添加剂混合物和精洗煤进行的测试表明灰分特性发生了显着变化。在检查的灰分形成和沉积样品中，原煤+铝土矿显示出最低的玻璃含量和高含量的刚玉，表明灰分沉积倾向较低。与灰分形成样品相比，沉积物样品显示出明显更低的玻璃含量，并且富含石英。除原煤+铝土矿样品外，所有样品均具有高硅和铁含量以及中等铝含量的特征。相比之下，原煤+铝土矿样品具有较低的二氧化硅含量和较高的氧化铝含量，这与 XRD 观察结果一致。 QEMSCAN™ 结果表明，灰分颗粒分布稀疏，表明缺乏沉积起始层。实验观察表明，使用原煤和铝土矿似乎在处理灰分相关问题方面具有最佳性能。目前的研究结果对于使用印度尼西亚煤炭的电力公司具有实际意义，因为文献中没有报道此类煤炭的灰分化学和矿物学的全面工作。
The paper reports a systematic and comprehensive laboratory investigation into the ash chemistry and mineralogical changes undergone by a low-rank Indonesian coal during combustion. Combustion experiments conducted in a drop-tube furnace included ash formation experiments (using cyclone and filter arrangement) under closely controlled conditions in the range of 1200–1400 °C and deposition experiments at a probe temperature of 750 °C. Tests conducted with raw coal, coal/additive mixtures and washed coal indicated significant changes in ash characteristics. Of the ash formation and deposit samples examined, the raw coal+bauxite showed the lowest glass content and high contents of corundum indicating low ash deposition propensities. When compared to the ash formation samples, the deposit samples showed even significantly lower glass contents and were enriched in quartz. With the exception of the raw coal+bauxite sample, all are characterized by high silica and iron and moderate aluminium contents. In contrast, the raw coal+bauxite sample have low silica and much higher alumina contents which is in agreement with XRD observations. QEMSCAN™ results showed that the ash particles are sparsely distributed suggesting lack of a deposit initiation layer. Experimental observations suggest that the use of raw coal with bauxite would appear to offer the best performance with respect to handling ash-related issues. Present findings are of practical significance to power utilities employing Indonesian coal as there is no comprehensive work reported in the literature on ash chemistry and mineralogy of such coals.