Abstract
AbstractThis paper aims to reveal the effect of adding biomass ash on the flow characteristics of Zhundong (ZD) coal ash. A new visual image measurement method for the flowability of coal ash was established. Furthermore, scanning electron microscopy (SEM) and x‐ray diffraction (XRD) were applied to analyze the influence of surface morphology and mineral component on the fusion fluidity of the samples. The results show that the flow properties of ZD ash are improved to varying degrees after adding maize straw (MS) ash. As the blending ratio increases, the improvement of flow velocity is higher. The critical flow temperature (TC) of the samples was calculated. The TC of ZD ash was 1249°C, which decreased with the addition of MS ash. The characterization results showed that adding MS ash increased the melting phase, while the surface of the samples tended to be dense and smooth. Meanwhile, the massive formation of hauyne with a low melting point and the high proportion of SiO2/Al2O3 in the ash promotes the melting behavior of the ash slag. The flow velocity of the samples is improved under the combined action of the increase of the melting phase and the smooth surface.
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