碱性氧化物对煤灰熔融特性的影响及机理研究

EFFECT OF ALKALI OXIDES ON ASH MELTING CHARACTERISTIC

向延安子长禾草沟煤(2#煤)中添加不同含量的助熔剂碱性氧化物,研究碱性氧化物含量对煤灰熔融温度的影响,并结合X射线衍射和扫描电镜探讨添加助熔剂后煤灰的熔融机理.结果表明,几种氧化物中Na2O降低煤灰熔融点效果最好,可以使煤灰熔融温度从1 300℃降到1 195℃,降低幅度为105℃;其次是CaO,K2O和MgO,降低幅度分别为75℃,55℃和45℃.煤灰在熔融过程中,矿物成分的变化是导致煤灰熔融温度发生变化的主要原因.

Adding different content of alkaline oxide in the coal of Yan＇an Zichang Hecaogou,the effect of oxide content on the ash melting temperature were studied and the mechanism of the ash fusion temperature change were analyzed by XRD and scanning electron microscope.The results show that in several oxides,Na2 O has the best effect on reducing the ash melting temperature,can make the ash fusion temperature from 1 300℃to 1 195℃,reduced by 105℃,followed by CaO,K2 O and MgO,decreased 75℃,55℃and 45℃respectively.The change of mineral composition is a major cause of the change of ash fusion temperature,while ash in the melting process.The study has vital significance in the melting temperature on changes in the coal of Yan＇an Zichang Hecaogou and expanding its scope of application.