A: Boiler main pressure parts
1. Water Tube Boiler
Drum, header, downcomer, water wall, convection tube bundle, slag tube, superheater, economizer, etc.
2. Shell boiler (fire tube boiler) shell, furnace liner, back combustion chamber, smoke pipe, cupola, foot ring, etc.
3. Water and Fire Tube Boiler
Both water tube boiler and shell boiler parts
B: Main heating surface
Economizer Economizer
Reduce exhaust gas temperature, improve boiler efficiency and save fuel
Acts as a partial heating or evaporative heating surface
If the boiler feed water directly enters the boiler drum without passing through the economizer, the temperature of the flue gas leaving the boiler will still be high. With the economizer, the feed water flows through the economizer first, and the large temperature difference between the feed water and the flue gas is used for heat exchange, so that the flue gas is fully cooled and the exhaust gas temperature is reduced.