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本文利用XRD、SEM等测试手段,采用配气技术实验研究了高温气化条件下(29.9%H_2,66.2%CO,3.9%CO_2)高、低灰熔点煤灰及其混煤灰的熔融行为及矿物质演变规律。研究表明:气化条件下高灰熔点煤A含有较多的高岭石和石英,随着温度的升高,莫来石开始逐渐形成(>960℃),当温度达到1300℃时煤灰A中的结晶矿物全部为莫来石;低灰熔点煤B含有较多的硬石膏和方解石,随着温度的升高,900～1200℃开始生成大量的钙长石、铁橄榄石、铁铝榴石等低熔矿物,在1300℃时煤灰B中的结晶矿物全部熔融;高温气化条件下,混煤灰A/B的熔融温度变化与其三元相图上相应的液相线温度具有良好的相似性,当混煤灰A/B的主要化学成分位于三元相图的二元共晶线或低熔融共晶点附近时熔融温度最低。
In this paper, the melting behavior of high and low ash coal ash and its fly ash under high temperature gasification conditions (29.9% H 2, 66.2% CO, 3.9% CO 2) was experimentally studied by XRD, SEM and other testing methods. Mineral evolution law. The results show that coal ash A contains more kaolinite and quartz in gasification conditions, and mullite begins to form (> 960 ℃) with the increase of temperature. When the temperature reaches 1300 ℃, coal ash A Of all the crystalline minerals are mullite; low ash melting point coal B contains more anhydrite and calcite, with the temperature increases, 900 ~ 1200 ℃ began to generate a large number of calcium feldspar, fayalite, almandine And other low-melting minerals, the crystalline minerals in coal ash B are all melted at 1300 ℃. The change of melting temperature of coal ash A / B and the corresponding liquidus temperature on the ternary phase diagram have good Similarity, when the main chemical composition of the coal ash A / B is located near the binary eutectic line or low melting eutectic point of the ternary phase diagram, the melting temperature is the lowest.