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Estimation of the direct leakage of rotary air preheaters based on temperature distribution modeling

机译：基于温度分布模型的旋转空气预热器直接泄漏估算

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摘要

In thermal power plants, air preheaters are used to preheat the combustion air with residual thermal energy of the flue gas. The air leakage from air to flue gas has negative impact on the heat transfer efficiency of air preheaters and the unit thermal economy. This paper proposes an online applicable approach to estimate the direct leakage of the air preheater based on temperature distribution modeling. To describe the heat transfer process in the air preheater, energy balance equations are established after discretizing the air preheater into a number of heat transfer units, where the unstable heat transfer caused by the rotor rotation is considered. The temperature distribution of the air preheater is obtained through iterative calculation of these energy balance equations. By solving the optimization problems with the objective to meet the conservation laws of mass and energy, the direct leakage of the secondary air and the primary air is estimated. Pseudo-online simulations are carried out with the history data of a 300 MW subcritical unit to verify the approach. The updating period of the calculation results is set to 30 s so that the proposed approach may be applied for online monitoring purposes. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在火力发电厂中，空气预热器用于将燃烧空气与烟气的残留热能一起预热。从空气泄漏到烟道气对空气预热器的传热效率和机组热经济性都有负面影响。本文提出了一种在线可应用的方法，用于基于温度分布模型估算空气预热器的直接泄漏。为了描述空气预热器中的传热过程，在将空气预热器离散化为多个传热单元后，建立了能量平衡方程，其中考虑了由转子旋转引起的不稳定传热。空气预热器的温度分布是通过这些能量平衡方程的迭代计算获得的。通过解决优化问题以达到满足质量和能量守恒定律的目的，可以估算二次空气和一次空气的直接泄漏。使用300 MW亚临界机组的历史数据进行了伪在线仿真，以验证该方法。计算结果的更新周期设置为30 s，以便将所建议的方法应用于在线监视目的。 （C）2019 Elsevier Ltd.保留所有权利。

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  • 来源
  • 作者

    Zhang Xiang; Yuan Jingqi; Tian Zhen; Wang Jingcheng;

  • 作者单位

    Shanghai Jiao Tong Univ, Dept Automat, 800 Dongchuan Rd, Shanghai 200240, Peoples R China|Minist Educ China, Key Lab Syst Control & Informat Proc, 800 Dongchuan Rd, Shanghai 200240, Peoples R China|Anhui Elect Power Design Inst Co Ltd, China Energy Engn Grp, 369 Fanhua Ave, Hefei 230601, Anhui, Peoples R China;

    Shanghai Jiao Tong Univ, Dept Automat, 800 Dongchuan Rd, Shanghai 200240, Peoples R China|Minist Educ China, Key Lab Syst Control & Informat Proc, 800 Dongchuan Rd, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Dept Automat, 800 Dongchuan Rd, Shanghai 200240, Peoples R China|Minist Educ China, Key Lab Syst Control & Informat Proc, 800 Dongchuan Rd, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Dept Automat, 800 Dongchuan Rd, Shanghai 200240, Peoples R China|Minist Educ China, Key Lab Syst Control & Informat Proc, 800 Dongchuan Rd, Shanghai 200240, 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

    Coal-fired power plant; Rotary air preheater; Direct leakage; Temperature distribution modeling; Heat transfer unit;

    机译：燃煤电厂;旋转空气预热器;直接泄漏;温度分布模型;传热单元;

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