Numerical Analysis of Coal Combustion in Circulating Fluidized Bed
combustion of coal is used in circulating fluidized bed combustion system. This work is concerned about gas–solid two-phase mixtures flowing upwards through the fast beds. The type of information resulting from various ways of analyzing the pressure variations and the effect of superficial velocity on pressure in fluidized beds are discussed. This paper presents the standard k–є and two-phase turbulence model used to describe the gas–solids flow in a CFB.The analysis of temperature and density in coal combustion is done by discrete phase model (DPM) and non pre mixed combustion in species model through the PDF file creation in DPM model. The flow temperature and density in the system were modeled by solving the continuity and momentum equations of the gas flow by using the CFD analysis. The fluidizing velocity has been taken as 4 m/s and the effects of operating parameters on mole fraction, mean density and mean temperature are discussed in this paper. It is observed that the mean density of minimum and maximum mean mixture fraction along the scaled variance is significant.
Recent Advances in Experimental and Numerical Analysis of Combustor Flow Fields in Supersonic Flow Regime
Survey of experimental and numerical studies have been done for different complex flow fields with respect to different aspect by mixing of different types of fuel and mixture with high speed flows in the combustion chamber. In this field many researchers worked to develop a configuration giving efficient mixing and combustion, also meeting the requirements of flame holding and completion of combustion with sufficient stabilization in the flow field. The main attention is paid to the local intensity of heat release, which determines, together with the duct geometry, techniques for flame initiation and stabilization, injection techniques and quality of mixing the fuel with oxidizer, the gas-dynamic flow regime. From the survey it concluded that some area in which more attention to be paid like total pressure loss in combustion chamber and design a contour to make the flow at Mach number 2 for various higher Mach numbers for supersonic combustion and analyze the flow properties in combustion chamber and its effect by using the variety of fuel with the help of CFD tool.
Yeats, Eliot, Pound and the Politics of Poetry: Richest to the Richest
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