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Study on Model of Ash Fouling Monitoring in Rotary Air Preheater of Coal-fired Power Plant Boiler

机译：燃煤电厂锅炉旋转空气预热器灰烬污垢监测模型研究

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摘要

As an important equipment to preheat air and to improve coal-fired power plant boiler efficiency with the heat of boiler tail flue gas, the air preheater's safe and economic operation influences unit efficiency directly. At present, above 80% utility-type unit in domestic uses tri-sectional rotary air preheater. Therefore, the rotary air preheater has become an indispensable auxiliary machinery in modern large boilers. Firstly, a kind of air preheater heat transfer model of inverse flue gas flow is proposed in this paper, the ash fouling situation of air preheater is showed with the cleanliness factors based on heat transfer model and flue gas pressure drop model respectively. Moreover, the cleanliness factor of air preheater is calculated and gained through thermodynamics indirectly with energy balance method. According to the verification results of the actual operation data of a 600MW coal-fired unit, both of these two kinds of mode can reflect the dynamic change of ash fouling situation of air preheater in real time, and among which, the cleanliness factor based on flue gas pressure drop mode has a better online monitoring result on ash fouling situation of heat transfer surface.
机译：作为预热空气的重要设备，并以锅炉尾烟气的热量提高燃煤发电厂锅炉效率，空气预热器的安全和经济运行直接影响单位效率。目前，国内80％的实用型单位使用三截面旋转空气预热器。因此，旋转空气预热器已成为现代大型锅炉中不可或缺的辅助机械。首先，本文提出了一种逆烟气流量的一种空气预热器传热模型，分别基于传热模型和烟气压降模型的清洁因素显示了空气预热器的灰烬污垢情况。此外，通过与能量平衡法间接地通过热力学计算和获得空气预热器的清洁度因子。根据600MW燃煤装置的实际操作数据的验证结果，这两种模式都可以实时反映空气预热器的灰烬污垢情况的动态变化，其中包括清洁度因素烟气压降模式在传热表面的灰烬污垢情况下具有更好的在线监测结果。

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