In this paper, muffle furnace and 4 corners combustion furnace are chosen to heat andburn the coal ash and raw coal. The vartiation of components of mineral matters duringheating is analysised by XRD. It shows that th...In this paper, muffle furnace and 4 corners combustion furnace are chosen to heat andburn the coal ash and raw coal. The vartiation of components of mineral matters duringheating is analysised by XRD. It shows that the behavior of mineral matters in coal ash in 4corners combustion furnace is similar to that in muffle furnace, and the behavior is greatlyrelated to the compositions and amounts of raw coal.展开更多
In this paper,the ash fusion characteristics and mineral behavior of individual coal ash and a series of two-component blendsd ashes are studied.The samples are heated progressively from(IT)at 100?℃intervals in reduc...In this paper,the ash fusion characteristics and mineral behavior of individual coal ash and a series of two-component blendsd ashes are studied.The samples are heated progressively from(IT)at 100?℃intervals in reducing atmosphere.Mineral composition and type at each temperature interval are determined by X-ray diffraction (XRD)analysis.For different coal ashes,the main mineral matter at 800?℃is quartz,anhydrite and hematite,calcite and feldspar.With increasing temperature,oxidation,thermal decomposition,transformation and reaction occur between the components.It can be seen that quartz,anhydrite decrease and anorthite,gehlenite increase.At about 1200?℃,all of mineral diminish and a glass phase is formed.Some combinations of mineral in component coal produce low-melting eutectic composition at a high temperature and this is the main reason causing the non-arithmetic average of softening temperature of blends ash.展开更多
文摘In this paper, muffle furnace and 4 corners combustion furnace are chosen to heat andburn the coal ash and raw coal. The vartiation of components of mineral matters duringheating is analysised by XRD. It shows that the behavior of mineral matters in coal ash in 4corners combustion furnace is similar to that in muffle furnace, and the behavior is greatlyrelated to the compositions and amounts of raw coal.
文摘In this paper,the ash fusion characteristics and mineral behavior of individual coal ash and a series of two-component blendsd ashes are studied.The samples are heated progressively from(IT)at 100?℃intervals in reducing atmosphere.Mineral composition and type at each temperature interval are determined by X-ray diffraction (XRD)analysis.For different coal ashes,the main mineral matter at 800?℃is quartz,anhydrite and hematite,calcite and feldspar.With increasing temperature,oxidation,thermal decomposition,transformation and reaction occur between the components.It can be seen that quartz,anhydrite decrease and anorthite,gehlenite increase.At about 1200?℃,all of mineral diminish and a glass phase is formed.Some combinations of mineral in component coal produce low-melting eutectic composition at a high temperature and this is the main reason causing the non-arithmetic average of softening temperature of blends ash.