Study On The Viscosity-temperature Characteristic Of Molten Slag During The Crystallization Process

Entrained flow gasification technology has been widely used in the field of energy conversion,with high efficiency and fuel flexibility.The entrained flow gasifier is usually operated at high temperature to ensure good slagging conditions and stable operation of the equipment.The viscosity is an important parameter affecting the fluidity of slag.Therefore,it is necessary to study the viscosity of the slag.In this paper,the main factors that affect the slag viscosity were studied especially.The Enistein-Roscoe model was modified to obtain a new model to predict slag viscosity.The main contents are as follows:1.The cooling rate has little effect on the total volume fraction of the crystal during the cooling process,but has a significant effect on the crystal morphology.Therefore,the influences of particle size,shape and aspect ratio on the suspension viscosity were mainly studied by using simulation medium.The Einstein-Roscoe equation was modified on the basis of a series of experimental data.2.In the process of slag crystallization,the crystal morphology changed greatly.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 model was verified by ten typical crystalline slags.3.During the viscosity measurement of coal samples with high content of sulfate,sharp oscillation appeared.Considering the decomposition of calcium sulfate and results obtained by TGA-MS,bubbles were composed of SO2.Results showed that the bubble composed of SO2 was the cause of oscillation in viscosity.