A super critical boiler consists of only economizer and super heater and it does not have an evaporator because
(A) Water temperature can be raised to critical temperature in the economizer itself
(B) High evaporation rate is achieved through forced circulation of water through tubes
(C) Enthalpy of evaporation becomes zero at critical pressure or above that
(D) Flue gas used to run rotary compressor supply high pressure air to the furnace