دانلود رایگان مقاله انگلیسی یک روش پیش بینی جدید برای ویسکوزیته سرباره زغال سنگ: مدل ویسکوزیته سرباره بلوری - الزویر 2018

ABSTRACT

The complex chemical composition of coal slag separated out different types and shapes of crystals during the cooling process. The morphology of the crystal in the molten slag influenced the viscosity of the coal slag. The aim of this paper was to obtain the viscosity model of crystalline slag using a new calculation method. The model of the suspension viscosity obtained by the previous study was used to predict the viscosity of molten slag. The correction factor (β) was introduced in the model of the suspension viscosity. The solid phase volume fraction (φ) in the molten slag was calculated by FactSage. The liquid phase viscosity (η0) was fitted by the viscosities of molten slag in high temperature section. Ten kinds of crystalline slags were applied in this study to prove the accuracy of the modified viscosity model. The viscosity of molten slag predicted by the model (CSM) agreed with experiment data.

4. Conclusion

In the process of slag crystallization, the crystal morphology changed greatly. Most of the crystals showed acicular shape, and the size of the crystals was relatively large. A small part of the crystals had the performance of square. The morphology of the crystals in the slag had a great influence on the slag viscosity. The viscosity of crystalline slag containing a large amount of crystals was difficult to predict. Therefore, to accurately predict the viscosity change during the crystallization process of the molten slag, a new method for predicting the viscosity of the crystalline slag (CSM) was obtained by using the model of the suspension viscosity given in the previous study. The solid phase volume fraction was calculated on the basis of FactSage. The model was verified by ten typical crystalline slags. It was found that the viscosity calculated by the model agreed with the experiment data, and the absolute error was small which proved the model was available for predicting the viscosity of crystalline slags. However, a little difference between the experiment data and the FactSage calculation results in the fitting of the viscosity at high temperature section was existed. Therefore, the problem of determining the liquid phase viscosity and solid phase volume fraction should be solved in the future work.