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首页> 外文期刊>Heat Transfer Engineering >A New One/Two-Dimensional Model of the Conjugate Heat Transfer in Waterwall Tubes of the Supercritical Steam Boiler Combustion Chamber
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A New One/Two-Dimensional Model of the Conjugate Heat Transfer in Waterwall Tubes of the Supercritical Steam Boiler Combustion Chamber

机译：超临界蒸汽锅炉燃烧室水冷壁管内共轭传热的一维/二维新模型

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摘要

An important issue arising in supercritical steam boilers is to avoid the tube wall overheating due to high heat fluxes transferred from flue gases to the fluid. The paper presents a new hybrid one/two-dimensional model of the fluid heating in waterwall tubes in the combustion chambers of steam boilers for supercritical steam parameters. The model is based on distributed parameters. The analysis concerns tubes with externally finned surfaces. Using the proposed model, it is possible to estimate zones and locations where the tube wall overheating may occur. One-dimensional equations describing the mass, momentum and energy conservation are formulated and solved for the fluid domain. Each analyzed cross section of the finned waterwall tube is divided into 20 control volumes for which energy balance equations are solved in a two-dimensional space. In order to analyses the conjugate heat transfer between the waterwall tube and the fluid, the heat transfer coefficient is computed using the Kitoh correlation. The computations assume a variable heat flux along the combustion chamber height. Also, the heat flux variation on the waterwall tube circumference is incorporated within the model. The reduction in dimensionality in both the fluid and the solid domains leads to an improvement in the computational performance compared to complex three-dimensional computational fluid dynamics simulations. The paper presents an application of the proposed hybrid model to simulate heat and flow processes occurring in waterwall tubes of a supercritical boiler operating in one of the Polish power plants. The results of the simulations are compared with the data obtained from measurements and good agreement is obtained. Therefore, the developed model can be successfully applied, e.g. in simulators of the supercritical power boiler operation.
机译：在超临界蒸汽锅炉中出现的重要问题是避免由于从烟道气传递到流体的高热通量而引起的管壁过热。本文针对超临界蒸汽参数，提出了一种新的一维/二维混合模型，用于蒸汽锅炉燃烧室中水冷壁管中的流体加热。该模型基于分布式参数。分析涉及具有外部翅片表面的管。使用提出的模型，可以估计可能发生管壁过热的区域和位置。为流体域公式化并求解了描述质量，动量和能量守恒的一维方程。翅片式水冷壁管的每个被分析的横截面被分成20个控制体积，在二维空间中为其求解能量平衡方程。为了分析水冷壁管和流体之间的共轭传热，使用Kitoh相关性计算传热系数。该计算假设沿燃烧室高度的热通量可变。同样，水冷壁管圆周上的热通量变化也包含在模型中。与复杂的三维计算流体动力学模拟相比，流体域和固体域中维数的减少导致计算性能的提高。本文介绍了所提出的混合模型的应用，以模拟在波兰一家电厂中运行的超临界锅炉的水冷壁管中发生的热和流动过程。将模拟结果与从测量中获得的数据进行比较，并获得良好的一致性。因此，开发的模型可以成功地应用，例如。在超临界功率锅炉运行的模拟器中。

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  • 来源
    《Heat Transfer Engineering》 |2018年第16期|1272-1282|共11页
  • 作者

    Zima Wieslaw; Nowak-Oclon Marzena;

  • 作者单位

    Cracow Univ Technol Inst Thermal Power Engn Al Jana Pawla 2 37 PL-31864 Krakow Poland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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