Wet back boiler
Structure: Single drum/ Horizontal type
Output: Steam or Hot Water
Rated output capacity: 1 t/h-20 t/h 0.7MW-14MW
Rated working pressure:0.7/1.0/1.25Mpa
Fuel : oil or gas
The wet back boiler design features a reversal chamber that is jacketed, or fully surrounded by water, which is used to direct flue gasses from the furnace to the tube banks. The surrounding water absorbs burner heat, help to improve heating efficiency as heat from combustion goes directly into evenly heating water instead of refractory. The wet back boiler design uses separate tube sheets between tube passes which can be more forgiving with load changes.
Wet back boiler designs have a water gap between the furnace and back wall, and all of the heat is generated directly into water. Some Dry back designs can be just as durable as wetback designs, but must have a heat balance in the system.
Wet back firetube boilers offer a more optimal functional footprint, with lift off or split-hinged doors that require no cool-down period and can be opened immediately. While there is no expensive refractory to maintain, internal pressure vessel maintenance (just as cleaning and tube removal) can be more involved and challenging.