15%

20%

30%

45%

pulverised fuel fired boiler

cochran boiler

lancashire boiler

babcock and wilcox boiler

boiler efficiency, turbine efficiency, generator efficiency

all the three above plus gas cycle efficiency

carnot cycle efficiency

regenerative cycle efficiency

vertical fire tube type

horizontal fire tube type

horizontal water tube type

forced circulation type.

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 drum and through down-comers located in atmospheric condition 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