ABSTRACT

Four different sulfur-containing coals (from low to high) (A, B, C and D) obtained from three different geographical locations of the North Eastern Region (NER) of India were studied for the control of ash fusion temperature (AFT) by oxides, generated via in-situ process, during coal combustion. The Meghalaya (B and C) and Nagaland (D) coals were found to contain high ash content in comparison to that of Assam coal (A). Meghalaya coals (B and C) were found to be better as they produce ash in greater quantity of acidic components (Al₂O₃ and SiO₂) and lower amount of basic components (Fe, Ca, Mg, Na and K oxides). This results in lower value of slagging and fouling indices of the Meghalaya coals, and hence increases their AFT. X-ray diffraction studies (XRD) and atomic absorption spectroscopy (AAS) were also performed for qualitative mineralogy and elemental analyses. Statistical tools. such as correlation coefficient and principal component analysis (PCA), confirmed that the low-to-medium AFTs of the coal samples are due to the presence of various fluxing agents (such as K, Fe, Mg and Ca). Ternary phase diagram indicates the fact that the Meghalaya coals (B and C) have higher amount of Aℓ₂O₃ with lower Fe₂O₃ contents, resulting in increased fusion temperature.

摘要

研究了从印度东北地区 (NER) 的三个不同地理位置获得的四种不同含硫煤（从低到高）（A、B、C 和 D）对灰熔化温度（AFT）的控制在煤燃烧过程中通过原位过程产生的氧化物。与阿萨姆煤 (A) 相比，梅加拉亚邦（B 和 C）和那加兰邦 (D) 煤的灰分含量较高。Meghalaya 煤（B 和 C）被发现更好，因为它们产生的灰烬中含有更多的酸性成分（Al ₂ O ₃和 SiO ₂) 和少量基本成分（Fe、Ca、Mg、Na 和 K 氧化物）。这导致 Meghalaya 煤的结渣和污垢指数值较低，因此增加了它们的 AFT。X 射线衍射研究 (XRD) 和原子吸收光谱 (AAS) 也用于定性矿物学和元素分析。统计工具。如相关系数和主成分分析 (PCA)，证实煤样的低到中等 AFTs 是由于存在各种助熔剂 (如 K、Fe、Mg 和 Ca)。三元相图表明，Meghalaya 煤（B 和 C）的 Aℓ ₂ O _{3含量较高，Fe 2} O ₃含量较低，导致熔化温度升高。