Air Preheater (external heat source type): Air preheaters that utilize low temperature heat from an external source (e.g. low pressure steam) to improve heater or boiler efficiency.
Air Preheater (direct exchange type): Air preheaters that exchange heat directly between flue gas and air. These air preheaters often require an external heat source air preheater to increase the air inlet temperature to prevent cold end corrosion.
Air Preheater (indirect exchange type): Air preheaters that use water or hot oil to cool the flue gas. The heated water is used to heat up the air. Cold end corrosion is prevented by keeping the water or hot oil is kept above the dewpoint temperature.
Air Preheater (direct exchange type): Air preheaters that exchange heat directly between flue gas and air. These air preheaters often require an external heat source air preheater to increase the air inlet temperature to prevent cold end corrosion.
Air Preheater (indirect exchange type): Air preheaters that use water or hot oil to cool the flue gas. The heated water is used to heat up the air. Cold end corrosion is prevented by keeping the water or hot oil is kept above the dewpoint temperature.
Boilers do exactly what their name suggests – they boil water. Using a fuel (usually natural gas), a boiler heats water until it is hot.
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