Numerical Simulation Of Combustion Space Near Spout In Oxygen-fuel Glass Furnace

This thesis reviewed systematically the development of numerical simulation for oxy-fuel combustion and turbulent combustion of glass melting furnaces, and established three—dimensional mathematical model which is very practical in combustion space of injection entrance oil fired oxy-fuel unit glass furnaces on the base of theory of glass melting furnaces and industrial application. The model includes standard k-εturbulent model, Eddy-Dissipation combustion model and P1 radiation model, and the CFD software is FLUENT. The content and result showed that:Firstly, this paper analyzed the relations between oxygen concentrations of the combustion-supporting gas and the velocity field, the temperature field and the mass fraction field of NO_x. The simulation results showed that, under the condition of oxy-fuel, the velocity become smaller, the max temperature become higher, the quality of gaseous pollutants become littler.Secondly, the influence on velocity field and temperature field of combustion were systematically investigated under different overplus oxygen coefficient, the size of gas entrance, the distance between gas entrance and oil entrance. The results showed that, the greater the overplus oxygen coefficient is, the higher the velocity and max temperature is; the whole velocity of velocity become smaller and the max temperature of flame become greater when the size of gas entrance become bigger; the greater the distance between gas entrance and oil entrance is, the smaller the whole velocity of velocity field is, the lower the max temperature of flame is.Finally, to increase heat efficiency and heat transfer effect, the relations between the three equal-height oil entrance and temperature field is studied under the same combustion system. The results showed that, under the same combustion system, the flame width of x-direction of the three oil entrance is wilder than that of the one oil entrance, and the heat efficiency become greater. The simulation result is processed by TECPLOT convenient for analyse.This paper quantitatively investigated the distribution of the velocity field, the temperature field and the mass fraction field of NO_x. The simulation results showed that, the 3d mathematical model of the paper comprehensively reflects the distribution law of the velocity field, the temperature field and the mass fraction field of NO_x in combustion space of injection entrance, these results will be very helpful to improve the quality of the glass furnace and the design of the injection.