July 2000

Heat Transfer

Eliminate air preheater corrosion

Consider these design options to improve reliability and efficiency

Nayek, S. K., Dingankar, S., Reliance Industries Ltd.

Waste heat recovery from fired heater flue gases is one of the important factors that influences overall efficiency of industrial heaters. In any conventional design, heat available in the flue gas is recovered in economizers and/or air preheaters before allowing it to go to the heater stack. While combustion air is a very good recipient of low value flue gas heat, the presence of acidic gases in the flue (from impurities like sulfur in fuel) has caused exchanger design, operation and maintenance to be a challenge. About 10% of the heat released by the fuel normally has potential for heat recovery in an air preheater. A cross-flow heat exchanger is commonly used in air preheater design.

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