Abstract
In the present paper, the furnace chamber of the BKZ-160 boiler of Almaty TPP-3 (Kazakhstan) has been calculated. The thermal characteristics of the process were studied in the form of the distribution of temperature fields and chemical energy, and the aerodynamics of the combustion chamber was also calculated. The type of fuel, its elementary and fractional composition, exerts the greatest influence on the course of heat-mass exchange processes and aerodynamics. The computational experiment was carried out with two models of particle size distribution: a polydisperse fuel flame (the particle diameter varies from 10 to 120 μm) and monodisperse fuel flame (particle size identical and equal to dp = 60 μm). Based on the results of the computational experiments, the main regularities in the distribution of heat fluxes in the combustion chamber volume and flow aerodynamics were obtained. It is shown that the greatest thermal load falls on the central region of the walls of the combustion chamber and the location of the burner devices, which is typical for both mono- and polydisperse fuel flames. The temperature data obtained as a result of the computational experiment showed better convergence with the empirical data obtained directly at TPP-3. Aerodynamics of the flow for the two selected models of particle size distribution has insignificant differences, but how they affect other characteristics of the process is one of the following tasks in view of the authors. It should be noted that the calculation of the polydisperse fuel flame takes much more calculation time.
Highlights
In the study of a wide range of modern problems of science and technology, numerical simulation of heat and mass transfer process is important and has enormous practical application [12]
For the better description combustion processes in the real three-dimensional physicalchemistry system it is necessary to consider many factors such as particle size distribution, the speed and temperature of the fuel mixture, a method of supplying fuel mixture, the effect of turbulent fluctuations, multistage chemical reactions, heat exchange by radiation, multiphase flows and other. In this regard the purpose of this research is to carry out numerical experiments for the study of turbulent heat and mass transfer in high-reacting flows, which are formed when burning a high-ash coal-dust flame of different dispersion of fuel in the combustion chamber of a boiler and determination of thermal and aerodynamic characteristics of the combustion chamber operating Thermal Power Plant of Kazakhstan
This paper presents the results of numerical modeling of aerodynamics and heat transfer in combustion of Ekibastuz coal, which heating value is 17.56 MJ/kg, in the camera of an industrial boiler BKZ-160
Summary
In the study of a wide range of modern problems of science and technology, numerical simulation of heat and mass transfer process is important and has enormous practical application [12]. For the better description combustion processes in the real three-dimensional physicalchemistry system it is necessary to consider many factors such as particle size distribution, the speed and temperature of the fuel mixture, a method of supplying fuel mixture, the effect of turbulent fluctuations, multistage chemical reactions, heat exchange by radiation, multiphase flows and other In this regard the purpose of this research is to carry out numerical experiments for the study of turbulent heat and mass transfer in high-reacting flows, which are formed when burning a high-ash coal-dust flame of different dispersion of fuel in the combustion chamber of a boiler and determination of thermal and aerodynamic characteristics of the combustion chamber operating Thermal Power Plant of Kazakhstan
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