CaO对高钙烟煤熔融特性的影响

 通过在高钙烟煤的煤灰中添加不同含量的CaO，用于研究高钙烟煤的熔融特性变化情况和不同CaO含量下煤灰的熔融特性温度的变化情况。并且通过FactSage热力学软件对不同成分的合成灰进行模拟计算，用于对试验结果的佐证。研究结果表明，随着CaO添加量（质量分数）的增加，煤灰的熔融特性温度的整体趋势是先降低而后逐渐增加的。通过不同温度下灰中的矿物组成可以看出，添加一定量的CaO后，会使得高钙煤灰形成一种低温共熔体，从而使得灰熔点达到最低值。随着CaO添加量的继续增大，煤灰中钙硅石以及单晶氧化钙等高熔点矿物出现，煤灰熔点开始逐渐增加。并且从FactSage软件计算出的液相线温度结果和相图结果可以看出，其变化的趋势和熔融特性温度变化的趋势一致。

Effect of CaO on melting characteristics of #br# high calcium bituminous coal

By adding different amounts of CaO in the coal ash of the high calcium bituminous coal, the ash fusion characteristics of the high calcium bituminous coal and the change of the melting temperature of the high calcium coal ash under different CaO additions were studied. The FactSage thermodynamics software was used to simulate the mineral transformation law and the ternary phase diagram of the coal ash, which was used to verify the experimental results of different components. The results show that with the increasing of the CaO content, the melting characteristic temperature of the coal ash firstly decreases and then gradually increases. The CaO is often used as a flux, and a small amount of CaO addition causes a decrease in the melting point of the coal ash. However, when the CaO content in the coal reaches a certain value, a low temperature eutectic is formed between the minerals in the coal ash, and the ash melting point reaches a minimum value. As the CaO content continues to increase, high melting minerals such as the wollastonite and the single crystal calcium oxide appear in the coal ash, which leads to a gradual increase in the melting point of the coal ash. The change in the melting characteristic temperature is consistent with the calculated liquidus temperature results and phase diagram results obtained by the software, and the experimental result also shows the reliability of the FactSage software calculation results.