B semester

In the boiler, the incoming feed water passes through an/a first before it enters the lower part of the drum From there it enters the circulating tubes which take it in the water drum , where water is heated by the combustion The combustion control system maintains constant steam pressure by controlling the of air and oil to the burner. The more advanced combustion controls . the air and oil to the burner simultaneously, but with a slight between air and oil, so that with an increased boiler load, the air will lead the oil, and on a decrease in the boiler load the oil will lead the air. The reaction – type turbine has all the advantages of the . - type, plus a slower operating speed and greater The steam in a reaction type turbine is fed from a high- pressure line into the high pressure turbine through a valve. After passing through this high pressure turbine where some of its energy is to useful work, the steam is fed to a low pressure turbine. A steam generating plant consists of a which is the space where the air and fuel oil mix and burn. The or shell is made of steel sheets and forms an airtight chamber. The walls and floor of the furnace have an of fireproof bricks in two or three layers. A is the opposite of a superheater. The feed valve controls the entry of the water in the boiler.