| This thesis systematically reviewed the modeling of numerical simulation for turbulent combustion in combustion space of glass melting furnaces and the development of the research methods of numerical simulation for the combustion process of the unit glass melting furnace, and established the three-dimensional natural-gas-fired mathematical model which is very practical in natural-gas-fired unit glass furnaces on the base of theories of glass melting furnaces and industrial application. The model mainly consists of flow, reaction and radiation model. The flow process includes continuity equation, momentum equation, turbulence equation and energy equation and applies standard k-ε model to solve; the reaction process applies finite-rate/eddy-dissipation model to solve; the radiation process applies discrete ordinates model to solve.In this paper, we meshed the model by using Gambit. The equations were calculated by Fluent and the results were displayed by Tecplot. Then the distribution of the flow and temperature fields was showed directly to realize the visualization of the calculations.The temperature and flow field distributions of the combustion space in natural-gas-fired unit glass furnaces (7200t/year) were studied. We analyzed the alteration of the distribution of the flow and temperature fields by changing the gas rates of the five couples of nozzles. It was concluded that this model could express objectively the law of the temperature and flow field distribution in the combustion space. The model fits the practical working conditions perfectly and is practically valuable. Therefore, the three-dimensional numerical simulation would be applied widely in the research of glass furnaces. |
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