A super critical boiler consists of only economizer and superheater 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