B semester

The incoming feed water passes through an/a first before it enters the lower part of the From there it enters the circulating tubes which take it in the water , where water is heated by the combustion . Then it enters the .tubes where water changes into wet steam which enters the upper part of the steam drum and becomes saturated. From there the steam passes through the 1st and the 2nd stage where it becomes superheated and is led to the turbine. Depending on the case there may be a/an to decrease the temperature of the superheated steam. The side and the roof of the furnace form a/ an of tubes very near each other, which are supplied with water from a water wall The may be placed either at the bottom of the boiler or at the top.