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Model establishment and performance evaluation of a modified regenerative system for a 660 MW supercritical unit running at the IPT-setting mode

机译:在IPT设置模式下运行的660 MW超临界机组的改进型再生系统的模型建立和性能评估

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摘要

Improving denitrification efficiency of supercritical unit for peak load regulation by changing feed water temperature has become a focus of thermal power engineering under wide load. However, the effect mechanism of feed water temperature on the performance of supercritical unit is indistinct absolutely at the intermediate point temperature (IPT)-setting mode, which obstructs the performance optimization and the excavation of energy saving of supercritical unit with a change of feed water temperature aims at improving denitrification efficiency of supercritical unit.For the purpose, a closed cycle theory in which thermal power unit operating parameters interact and form a closed influence mechanism was defined and proposed, with such a core ideology, the performance analysis and assessment models under IPT-setting mode is constructed on the differential theory, energy balance and thermodynamics method, and the accuracy of established model is verified. These developed models are applied to assess the operational performance and to identify energy saving potential of supercritical unit for peak load regulation.Subsequently, a typical 660 MW ultra-supercritical coal fired power plant is selected as a reference case. Not only a quantitative analysis of effect of increasing feed water temperature adding HP heaters on supercritical unit performance is performed, but the effect of reducing feed water temperature stopping HP heaters on supercritical unit performance is implemented as well at the IPT-setting mode. Finally, the influence mechanism of feed water temperature on boiler thermal efficiency, steam turbine thermal consumption rate, standard coal consumption rate, power generation, denitrification efficiency, NOx production, steam temperature and other operating parameters of supercritical unit is absolutely revealed on IPT-setting mode. The investigation results show that the sensitivity of feed water temperature to supercritical unit performance varies greatly in different range of feed water temperature, especially when the feed water temperature is heated to the near the pseudo critical temperature, a dramatic change would take place in operation parameters of supercritical unit. Such a viewpoint is presented rigorously that increasing feed water temperature does not always achieve energy saving for supercritical units, also contrary to the existing viewpoint. (C) 2019 Published by Elsevier Ltd.
机译:通过改变给水温度来提高超临界机组的峰值负荷调节反硝化效率已成为大负荷下火电工程的重点。但是,给水温度对超临界机组性能的影响机理在中间点温度(IPT)设定模式下是完全不清楚的,这阻碍了性能的优化和随给水量的变化对超临界机组节能的挖掘。为此,提出并提出了一种以火电机组运行参数相互作用并形成闭环影响机理的闭环理论为核心思想,提出了一种基于超临界机组的反硝化性能评估模型。建立了基于微分理论,能量平衡和热力学方法的IPT设定模式,验证了所建立模型的准确性。这些开发的模型可用于评估运行性能并确定用于调节峰值负载的超临界机组的节能潜力。随后,选择典型的660 MW超超临界燃煤电厂作为参考案例。在IPT设置模式下,不仅定量分析了增加HP加热器给水温度对超临界机组性能的影响,而且还实现了降低给水温度使HP加热器停止对超临界机组性能的影响。最后,在IPT设定中绝对揭示了给水温度对锅炉热效率,汽轮机热耗率,标准煤耗率,发电,反硝化效率,NOx产生,蒸汽温度和其他运行参数的影响机理。模式。研究结果表明,给水温度对超临界机组性能的敏感性在给水温度范围内变化很大,特别是当给水温度被加热到接近伪临界温度时,运行参数会发生巨大变化。超临界单元。严格地提出这样的观点,即,与现有观点相反,提高给水温度并不总是实现超临界单元的节能。 (C)2019由Elsevier Ltd.发布

著录项

  • 来源
    《Energy》 |2019年第15期|890-915|共26页
  • 作者单位

    Northeast Elect Power Univ, Sch Energy & Power Engn, Jilin 132012, Jilin, Peoples R China;

    Northeast Elect Power Univ, Sch Energy & Power Engn, Jilin 132012, Jilin, Peoples R China;

    Northeast Elect Power Univ, Sch Energy & Power Engn, Jilin 132012, Jilin, Peoples R China;

    Northeast Elect Power Univ, Sch Energy & Power Engn, Jilin 132012, Jilin, Peoples R China;

    Northeast Elect Power Univ, Sch Energy & Power Engn, Jilin 132012, Jilin, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Supercritical unit; Regenerative system; IPT-Setting mode; Performance assessment; NOx generation and removal;

    机译:超临界机组再生系统IPT设定模式性能评估NOx生成与去除;

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