A simple schematic diagram of a typical coal-fired power plant steam generator (boiler) that highlights where the combustion air preheater (APH) is usually located. The diagram is meant to be used in the Wikipedia "Air preheater" article ... and wherever else it might be useful. For simplicity, any radiant section tubes are not shown.
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Schematic diagram of typical coal-fired power plant steam generator
This is a much improved version of my original uploaded diagram and it is better than the derivative svg version, which is badly distorted as it was displayed in theAir preheater article.