SIMULATION OF FLOW, COMBUSTION AND HEAT TRANSFER IN A TWO-DIMENSIONAL NATURAL GAS - FIRED INDUSTRIAL FURNACE (RADIATION, TURBULENCE, SPECTRAL, PARAMETER)
Abstract
Flow, combustion and radiative and convective heat transfer in a natural gas-fired, two-dimensional industrial furnace are simulated numerically. The k-(epsilon) model is used for turbulent flow predictions. Combustion of premixed fuel is simulated by Bray's model. Radiation transfer, including the effects of temperature and concentration fluctuations, is also modeled. The P(,1)-approximation is used to solve the radiative transfer equation, and a new spectral group model for real gases is proposed. SIMPLER algorithm is employed to solve the transport equations of momentum and other scalar variables. Radiation field is determined using a modification of the SIMPLER scheme. The computation have shown that radiation is the predominant mode of heat transfer for high temperature, large size industrial furnaces. Turbulence/radiation interaction is important, especially when the flame is large compared to the size of the furnace. Spectral group modeling is versatile and reliable. Thermal efficiency of a furnace can be improved by an increase in the adiabatic temperature, increase in the sink emissivity, decrease in the sink temperature, oblique firing, adiabatic port conditions, thermal insulation of refractory walls and increase in the emissivity of the refractory walls.
Degree
Ph.D.
Subject Area
Mechanical engineering
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