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Comparison study of fusibility between coal ash and synthetic ash
Fuel Processing Technology ( IF 7.5 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.fuproc.2020.106593
Zong-shuai Yuan , Ji Wang , Lingxue Kong , Jin Bai , Zhonghai Ni , Huaizhu Li , Zongqing Bai , Wen Li

Abstract Coal ash fusibility plays an essential role in selecting coal and determining operation condition for different gasifiers. To understand main factors on ash fusibility for adjustment, the synthetic ash which composed of pure oxides is widely used in previous study instead of the real coal ash. However, the comparison on fusibility between coal ash (CA) and synthetic ash (SA) is still unknown. In this study, four typical coals were selected to compare fusibility between CA and SA. The results indicated that the SA is not suitable to simulate all CA for fusibility study. For the ash with high-calcium-low-iron, SA can be used because of the same mineral transformation at high temperatures. The AFTs of the ash with high-calcium-high(medium)-iron is higher than that of SA, resulting from difference between gehlenite and akermanite. Mullite is detected in CA with low-calcium-low-iron, so the SA cannot replace CA to investigate fusibility for absence of mullite. Besides, fusibility of samples with low liquid content and high viscosity of liquid cannot be simulated by synthetic ash due to different mass transfer rate. The ashes with chemical compositions located in high-melting-temperature region shows an obvious different fusibility between CA and SA because of the low liquid content.

中文翻译:

粉煤灰与合成灰的可熔性对比研究

摘要 煤灰的可熔性对于不同气化炉的选煤和确定运行条件起着至关重要的作用。为了了解影响灰熔性调整的主要因素,以往的研究中广泛使用由纯氧化物组成的合成灰而不是真正的煤灰。然而,煤灰(CA)和合成灰(SA)的可熔性比较仍然未知。在这项研究中,选择了四种典型的煤来比较 CA 和 SA 之间的可熔性。结果表明,SA 不适合模拟所有 CA 进行可熔性研究。对于高钙低铁的灰分,由于在高温下矿物转变相同,可以使用SA。高钙高(中)铁灰分的 AFTs 高于 SA,这是由于钙黄长石和钙黄长石之间的差异。在 CA 中检测到的莫来石具有低钙低铁,因此 SA 不能代替 CA 来研究不存在莫来石的可熔性。此外,由于传质速率不同,合成灰无法模拟低液体含量和高液体粘度的样品的熔化性。化学成分位于高熔点区域的灰烬由于液体含量低,在 CA 和 SA 之间显示出明显不同的可熔性。
更新日期:2021-01-01
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