one-half

one-third

one-fourth

two-fifth.

serve as storage of steam

serve as storage of feed water for water wall

remove salts from water

separate steam from water

centrifugal pump

axial flow pump

gear pump

reciprocating pump.

coking coal

non coking or free burning coal

pulverised coal

high sulphur coal

heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

water is supplied in durm and through down-comers located in atmospheric conditon it passes to the water wall and rises to drum in the form of mixture of water and steam

feed pump is employed to supplement natural circulation in water wall type furnace

water is converted into steam in one . pass without any recirculation