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Prediction and Control of Steam Accumulation

机译：蒸汽积累的预测与控制

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摘要

Steam accumulators are applied as buffers between steam generators and consumers in cases of different steam production and consumption rates. The application of the steam accumulator saves energy, reduces pressure fluctuations, and prevents aging of tubes and pressurized vessels in steam generators. In this paper, modes of the steam accumulator operation are analyzed and the general design of the steam accumulator control system is defined. Equilibrium and nonequilibrium thermodynamic models of the steam accumulator are presented with the aim of predicting the steam accumulator capacity and as support to the design of the control system. The equilibrium model is based on the mass and energy balance equations of the total water and steam content in the accumulator, while the nonequilibrium model is based on the mass and energy balance equations for each phase and closure laws of nonequilibrium evaporation and condensation rates. The steam accumulator pressure transients are simulated for constant steam charging and discharging flow rates, and the influence of the nonequilibrium condensation and evaporation rates on the steam accumulator capacity is shown. It is concluded that the commonly used equilibrium thermodynamic approach to the steam accumulator design does not provide accurate results in cases of rapid charging and discharging transients; therefore, there is a need for the application of the nonequilibrium approach.
机译：在蒸汽产生量和消耗量不同的情况下，蒸汽蓄能器可用作蒸汽发生器和用户之间的缓冲器。蒸汽蓄能器的使用可以节省能量，减少压力波动，并防止蒸汽发生器中的管道和加压容器老化。本文分析了蒸汽蓄能器的运行模式，并定义了蒸汽蓄能器控制系统的总体设计。提出了蓄热器的平衡和非平衡热力学模型，目的是预测蓄热器的容量，并为控制系统的设计提供支持。平衡模型基于蓄能器中总水和蒸汽含量的质量和能量平衡方程，而非平衡模型基于每个相的质量和能量平衡方程以及非平衡蒸发和冷凝速率的闭合定律。模拟了蒸汽蓄能器的压力瞬变，以保持恒定的蒸汽充，放流量，并显示了非平衡冷凝和蒸发速率对蒸汽蓄能器容量的影响。结论是，在快速充，放电瞬变的情况下，通常采用的平衡热力学方法不能提供准确的结果。因此，需要应用非平衡方法。

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  • 来源
    《Heat Transfer Engineering》 |2015年第8期|498-510|共13页
  • 作者

    VLADIMIR D. STEVANOVIC; MILAN M. PETROVIC; SANJA MILIVOJEVIC; BLAZENKA MASLOVARIC;

  • 作者单位

    Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11120 Belgrade, Serbia;

    Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia;

    Innovation Center of the Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia;

    Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia;

  • 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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