五彩湾煤灰的烧结特性及不同添加剂的影响规律

Sintering characteristics of Wucaiwan coal ash and effect of different additives

    摘要
  • 摘要: 采用热机械分析仪、高温热台显微镜、XRD及FactSage软件相结合的方法，研究了五彩湾煤灰的烧结特性及不同添加剂的影响规律。结果表明，沙子（SiO2含量约为80%）和煤矸石（SiO2含量为54%，Al2O3含量为42%）能改变煤灰的烧结特性（烧结温度和烧结速率），但不同添加剂改变的程度不同。添加10%的沙子能使烧结温度提高70 ℃，而0-15%煤矸石不能使烧结温度升高。此外，烧结速率随添加剂增多而减小，烧结区间随添加剂增多而延长。进一步研究表明，添加剂能够改变煤灰初始液相温度、组成、含量、煤灰中硫酸盐的分解温度及初始液相温度从而改变煤灰的烧结特性。

     

    Abstract: The effect of different additives on sintering characteristics of Wucaiwan coal ash was studied by TMA combined with XRD, in-situ hot stage microscope and FactSage thermodynamic software. The results show that the additives could improve the sintering problems of coal ash, but the effect of different additives on sintering characteristics is various. For example, the sintering temperature increases by 70 ℃ when 10% of the sand is added, but the sintering temperature does not increase by addition of coal gangue in the range of 0-15%. Further studies show that the variation of sintering characteristics can be attributed to the change of initial liquid phase temperature, compositions, content and decomposition temperature of sulfates in coal ash.

     

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