Abstract

To produce coal with a high ash fusion temperature (AFT) as the raw material for gasification, the addition of fluxes is often adopted. In this paper, the ash chemistry of coals from the Huainan–Huaibei mining area (Zhuji and Taoyuan) was analysed to investigate the mechanisms of the composition modulation and, subsequently, the ash melting behaviour of coals with high-ash melting points in relation to non-pure matter fluxes. The chemical composition of the mixed ash was studied via X-ray powder diffractometry using normalised reference intensity ratio software, with the mineral transformation behaviour obtained using a scanning electron microscope analyser equipped with an energy-dispersive X-ray spectrometer and summarised using FactSage8.1 software analysis. For coals from Taoyuan and Zhuji, which have high silica–aluminium oxide content, the AFTs were significantly reduced when flux additions of 6% were used to meet the requirements of the entrained flow gasifier. To balance the gasification requirements and the controlled addition, the optimum addition level for the two high-ash-melting-point coals is 5–6%. The increase in flux addition leads to the conversion of high-melting-point mullite, sillimanite and quartz to amorphous materials, which reduces the corresponding AFTs, with the amorphous materials subsequently producing a liquid phase with a content that reflects the change in AFT.

中文翻译：

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助熔剂对淮南、淮北矿区高灰熔温度煤灰熔行为的调控

摘要

为了生产高灰熔温度（AFT）的煤作为气化原料，通常采用添加助熔剂的方式。在本文中，分析了淮南-淮北矿区（诸暨和桃园）煤的灰化学成分，研究了成分调制的机制，进而研究了高灰熔点煤的灰熔融行为。非纯物质通量。使用归一化参考强度比软件通过 X 射线粉末衍射仪研究混合灰的化学成分，使用配备能量色散 X 射线光谱仪的扫描电子显微镜分析仪获得矿物转变行为，并使用FactSage8.1进行总结软件分析。对于高硅铝氧化物含量的桃园和诸暨煤，当使用 6% 的助熔剂添加量来满足气流床气化炉的要求时，AFT 显着降低。为了平衡气化要求和控制添加，两种高灰熔点煤的最佳添加水平为 5-6%。助焊剂添加量的增加导致高熔点莫来石、硅线石和石英转化为无定形材料，从而降低了相应的 AFT，无定形材料随后产生液相，其含量反映了 AFT 的变化。