| Huainan coal is valuable,which can't be used directly in entrained-flow Bed Gasification technology for its high ash fusion temperature (FT>1500℃).At present, the methods used to add limestone appears frequently blocked.Therefore, it is great significance to develop efficient complex flux.In this paper,four representative coals selected from Huainan were used in the study. Orthogonal and Mixing ratio was used to develop efficient complex flux.Besides, effect of flux addition on Huainan coal ash fusion temperature and slag viscosity was studied.The mechanism of mineral transformation were analysed by X-ray diffraction (XRD) when Effective complex flux adding.Some primary results are obtained as follows:1) KZ3# and KZ2# are important factors of the ash fusion temperature. The results obtained in regressive mathematical model forecast are the same as the results in experimental data. With the same addition of coal-based, the high effect complex flux reduced the fluidization temperature was 2 times as high as that of KZ1#. The coal-based addition of high effect complex flux was 0.5 times and even less as high as that of KZ1#, on condition that they could be reduced the fluidization temperature below 1350℃.2)Compared with KZ1#, the high effect complex flux could be reduced the fluidization temperature below 1350℃when its addition was 1/2, and not only extended the fluidization temperature range of ash slag, but also reduced the temperature of 25Pa-s ash slag viscosity.3) The X-ray diffraction analysis shows that:The structure of mineral phases in coals was broken and the intensity of mullite formed was declined at high temperatue by adding efficient complex flux. With temperature increasing, the cordierite, feldspar and ruby spinel phases were formed, which reacts with quartz to form a low-melting eutectic mixture to lower the ash fusibility temperature. Figure 33 Table 12 References 76... |
PDF Full Text Request