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Numerical study of the dehumidification structure optimization based on the modified model

机译：基于改进模型的除湿结构优化数值研究

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摘要

Nowadays, the vast majority of electricity is extracted from the steam turbine, while the non-equilibrium condensation will take place because of the high steam velocity and low superheat temperature in steam low-pressure stage, which will not only reduce the efficiency but endanger the safety of the steam turbine by corroding the blade. The aim of this work is to optimize the novel dehumidification structure to reduce the wetness loss and increase the efficiency of steam turbine. Firstly, the modified model is developed to predict the non equilibrium condensation flow. The modified model is validated in stator cascade, which shows a greater agreement with the experimental data compared with original model, especially the Wilson point and pressure rise caused by the non-equilibrium condensation. Secondly, two novel dehumidification structures are presented on the basis of my previous study, and the dehumidification effect is checked using the modified model. With the passage outlet diameter increasing in the PICS, the reduction of the outlet average liquid mass fraction and wetness loss in cascade has the same tendency, and the more the passage outlet diameter, the lower the outlet average liquid mass fraction, the less the wetness loss caused by the non-equilibrium condensation in cascade. Thirdly, compared with the original cascade, the PICS with the phi = 5 degrees having the divergence nozzle characteristic and larger outlet diameter presents the best dehumidification effect and succeeds in reducing the average liquid mass fraction and wetness loss to 3% and 3.06 kJ/kg, respectively.
机译：如今，绝大部分电能是从蒸汽轮机中提取的，而由于蒸汽低压阶段的高蒸汽速度和较低的过热温度，会发生非平衡凝结，这不仅会降低效率，而且还会危害蒸汽的产生。通过腐蚀叶片来确保蒸汽轮机的安全。这项工作的目的是优化新型除湿结构，以减少湿度损失并提高蒸汽轮机的效率。首先，开发了修正模型来预测非平衡凝结水流。改进的模型在定子叶栅中得到了验证，与原始模型相比，与实验数据吻合得更好，特别是由非平衡冷凝引起的威尔逊点和压力上升。其次，在我以前的研究的基础上，提出了两种新颖的除湿结构，并使用改进的模型来检验除湿效果。随着PICS中通道出口直径的增加，出口平均液体质量分数的降低和级联中的湿度损失具有相同的趋势，并且通道出口直径越大，出口平均液体质量分数越低，湿度越小级联中非平衡冷凝引起的损失。第三，与原始级联相比，具有发散喷嘴特性和较大出口直径的phi = 5度的PICS表现出最佳的除湿效果，并成功地将平均液体质量分数和湿度损失降低至3％和3.06 kJ / kg ， 分别。

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  • 来源
    《Energy Conversion & Management》 |2019年第2期|159-177|共19页
  • 作者

    Zhang Guojie; Wang Fangfang; Wang Dingbiao; Wu Tan; Qin Xiang; Jin Zunlong;

  • 作者单位

    Zhengzhou Univ, Sch Chem Engn & Energy, Zhengzhou 450001, Henan, Peoples R China;

    Zhengzhou Univ, Sch Chem Engn & Energy, Zhengzhou 450001, Henan, Peoples R China;

    Zhengzhou Univ, Sch Chem Engn & Energy, Zhengzhou 450001, Henan, Peoples R China;

    Zhengzhou Univ, Sch Chem Engn & Energy, Zhengzhou 450001, Henan, Peoples R China;

    Zhengzhou Univ, Sch Chem Engn & Energy, Zhengzhou 450001, Henan, Peoples R China;

    Zhengzhou Univ, Sch Chem Engn & Energy, Zhengzhou 450001, Henan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Modified model; Dehumidification structure; Non-equilibrium condensation; Wetness loss;

    机译：改进模型;除湿结构;非平衡凝结;湿度损失;

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