回转式空气预热器温度场自校正计算方法

Self-correction Algorithms to Estimate the Temperature Distribution of Rotary Air Preheaters

以火力电站三分仓回转式空气预热器为研究对象，通过分析微元内部流体和金属壁之间的热交换过程，建立了空预器微元的能量平衡和质量平衡方程。开发了一种计算空气预热器温度场分布的自校正算法。自校正算法的核心是在线辨识气体对流放热系数修正因子和金属携带热量增量修正因子，空气预热器温度场则是算法的输出。与实际测点对比结果表明，算法精度较高，可满足空气预热器稳态运行监控的要求，对火力电站安全运行有潜在应用价值。

Aimed at the tri-sector rotary air preheater in thermal power plants, the heat transfer process between the fluid and the metal wall is analyzed and the energy and mass balance equations of the heat transfer unit are established. An algorithm for the rotary air preheater temperature field is developed. The key point of the algorithm is the identification of correction factors for the flue heat transfer coefficient and the heat increment carried by metal. Finally, the three-dimensional map of temperature distribution for the rotary air preheater is represented. Comparison between the actual process data and the simulated output indicates that the algorithm has relatively high accuracy and can be used to monitor the steady operation of rotary air preheaters.