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Application of CFD Modeling in HRSG Evase Design

机译:CFD建模在HRSG花瓶设计中的应用

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Computational simulation of flow, heat transfer and combustion in a vertical tube heat recovery system generator (HRSG) with a single angel roof, a dual angle roof and an air flow optimized evase are studied. Existing theoretical models for flow and gas combustion [1] are used to predict how the three kinds of roof shapes influence the flue gas and temperature distribution in the whole HRSG System, and particularly the flue gas distribution upstream of first heat exchanger bundles (superheater 3 and reheater 2) and duct burner as well as the temperature distribution downstream of the duct burner. The gas phase conservation equations of momentum, enthalpy and mixture fraction are solved utilizing the k- (epsilon) turbulence model. A Finite Rate/Eddy Dissipation model and the P-l radiation mode are used to predict gas combustion and radiative heat transfer, respectively. The simulation results show the air flow optimized evase not only provides a more uniform velocity profile upstream of the first heat exchanger bundle, but is also able to reduce the pressure drop through the whole HRSG system.
机译:研究了具有单天使顶,双角顶和优化气流的垂直管式热回收系统发生器(HRSG)的流动,传热和燃烧的计算模拟。现有的流动和气体燃烧理论模型[1]用于预测三种屋顶形状如何影响整个HRSG系统中的烟气和温度分布,特别是第一热交换器束上游的烟气分布(过热器3和再热器2)和风道燃烧器以及风道燃烧器下游的温度分布。利用k-(ε)湍流模型求解了动量,焓和混合物分数的气相守恒方程。有限速率/涡流耗散模型和P-1辐射模式分别用于预测气体燃烧和辐射热传递。模拟结果表明,优化的气流消除不仅在第一热交换器束的上游提供了更均匀的速度分布,而且还能够减少整个HRSG系统的压降。

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