流化床反應(yīng)器富氧燃燒的數(shù)值模擬
[Abstract]:In recent years, in order to mitigate the global warming caused by greenhouse gases, fluidized bed oxygen-enriched combustion technology has become the focus of research. This paper is only a preliminary work for the establishment of a complete simulation calculation of bubbling fluidized bed combustion. In this paper, the Euler-Euler method is used to describe the interaction between gas-solid phases, and the (the Kinetic Theory of Granular Flow) KTGF model is used as the closed equation to simulate the cold state and the hot state, respectively. The reaction rate is mainly described by Arrhenius equation, while the effect of diffusion rate and solid specific surface area is considered in heterogeneous reactions, and the efficiency factor is introduced. The simulation results are compared and analyzed with the experimental results or references. In the cold state simulation, the influence of jet and turbulence model is discussed. The formation, rise, polymerization and breakage of bubbles are normal, but the jet reduces the pressure drop and porosity of the bed layer, improves the uniformity of the bubble, and enhances the flow rate of the gas in the local area. The volume of bubble is reduced and the fluctuation of pressure is reduced. The turbulence model enhances the disorder of gas and solid, disrupts the uniform distribution of bubbles, and increases the pressure drop of bed layer. In the hot state simulation, the turbulence model increases the pressure drop of the whole reactor and improves the consistency between the simulation and the experiment, so the turbulence model should be used in the simulation process. On the other hand, the reaction rate of devolatilization is larger than that of in-phase reaction, and the setting of in-phase reaction rate should be adjusted. According to the correlation analysis, the thermal simulation is optimized and the relatively ideal results are obtained.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:X701;X77
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