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The drum contained within the cylindrical casing is formed into segments into which are placed removable ( for cleaning) baskets, consisting of vertical plates (to give minimum resistance to flow) The drum slowly rotates, about 4 rev/min, driven via a flexible coupling,gear train, clutch and thrust bearing by one of two electric motors; one mounted on top the other below. As the drum rotates a segment will enter the gas side, here it removes heat from the gas, it continues to rotate until entering the air side where it will give up its heat to the air. The heat transfer is very efficient, however, soot and corrosive deposits quickly build up in the mesh and hence an effective soot blowing method is essential. This normally takes the form of an arm , pivoted at the circumference of the drum with a single nozzle at the other end. This sweeps acros the drum rather like a record arm. One of these arms are fitted top and bottom. Gas leakage to the air side is prevented by the air being at a higher pressure and by fine radial clearance vanes fitted in the drum segments. By passes for both air and gas sides are fitted to prevent fouling with the reduced gas flow and temperature, also during manoeuvring when the possibility of different gas/air flow rates occurring leading to high metal temperatures and possible fires. Failure by uptake fires is not uncommon with this as in most gas/air heater designs.

Related Terms

ABMA

American Boiler Manufacturers Association.

RETURN-STEAM CONDENSATE

That steam produced by a boiler which returns to the boiler after it has condensed.

ASME SECTION VII SUBSECTION C6

Operation of boiler auxiliaries.

ASME SECTION VII SUBSECTION C4

Prevention of direct causes of boiler failure.

ASME SECTION VII SUBSECTION C2

Operating and maintaining boiler appliances.

CONDENSATE POLISHER

A device used to clean the returning condensate to the boiler feedwater system.

CALCIUM

A scale forming element found in boiler feed water.

DE-CARBONATION

Refers to the removal of carbon dioxide from the boiler feedwater.

DE-AERATING HEATERS

Mechanical device using steam to strip dissolve gases from the boiler feedwater and heating the feedwater.

DE-MINERALIZER

A device which removes dissolved matter from boiler pretreated water by contacting the water with ion-exchange resins.
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