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CFD STUDIES ON BURNER SECONDARY AIR FLOW

机译:燃烧器二次气流的CFD研究

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摘要

In many fossil power plants operating today, there is insufficient means to assure the proper balancing of the secondary airflows between the individual burners of wall-fired units in addition there is a problem of dust deposition on the floor. This mismatch leads to decreased boiler efficiency and increased emissions. In this study, a Computational Fluid Dynamics (CFD) modeling of a fossil power plant wind box scale model is performed using the commercial software CFX5.6. The model solves the three dimensional Reynolds averaged Navier-Stokes equations with the K-epsilon turbulence model. The CFD results are validated by the experimental data taken from a 1/8th scale model of a wall fired fossil unit. Simulations under various flow conditions are obtained to identify the optimum design in terms of the equalization of the secondary airflow through the burners.
机译:在当今运行的许多化石发电厂中,没有足够的手段来确保壁燃单元的各个燃烧器之间的二次气流的适当平衡,此外还存在灰尘沉积在地板上的问题。这种不匹配会导致锅炉效率下降和排放增加。在这项研究中,使用商业软件CFX5.6对化石电厂风箱规模模型进行了计算流体动力学(CFD)建模。该模型使用K-ε湍流模型求解三维雷诺平均Navier-Stokes方程。 CFD结果由壁烧化石单元的1/8比例模型获得的实验数据验证。获得了在各种流动条件下的仿真,以根据通过燃烧器的二次气流的均等来确定最佳设计。

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