In a Lancashire boiler, the heat is transferred to the water by :
radiation from wails of furnace
natural circulation of water between water tubes and drum
flue tubes immersed in the water
blow-down
flue tubes immersed in the water
The Lancashireboileris a shell and tube type heat exchanger.
The fuel is burn at the grate.
The water is pumped into the shell through the economizer which increases the temperature of water, apart from this, heat is also transferred to the water by fully immersed fire tubes.
Hence, the correct option is (C).
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