A. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of stdam bubbles and hot water which rise to durm
B. water is supplied in drum and through downcomers” located in atmospheric conditon it passes to the water wall and rises to durm in the from of mixture of water and steam
C. feed pump is employed to supplement natural circulation in water wall type furnace
E. water is converted into steam in one pass without any recirculation
E. water is fed under high pressure and high velocity
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