A. Chromium-molybdenum.B. Tungsten-platinum.C. Chromium-platinum.D. Steel-tungsten.Answer: A. Chromium-molybdenum.
Explanation: Super heater: - The steam produced in the boiler is wet and is passed through a super heater where it is dried and superheated by the flue gases on their way to the chimney.
- Superheating provides two principal benefits. Firstly, the overall efficiency is increased.
- Secondly, too much condensation in the last stages of the turbine is avoided.
- The superheated steam from the super heater is fed to the steam turbine through the main valve.
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Steam produced from a boiler without a super heater will either be dry saturated or more likely, wet.
- In works where steam is transmitted over long distances, the Inevitable heat loss from pipe surfaces causes the steam to become even wetter at the point of use unless a super heater is fitted to the boiler plant.
- This is a separate battery of pipes placed near the boiler furnace through which steam passes to receive additional heat by either convection or radiation.
- The super heater increases the surface area capable of accepting heat and the production of heat also slightly increases the thermal efficiency of the boiler.
- In steam power station super heater consists of group of tubes made of Chromium-molybdenum.
A. Chromium-molybdenum.
B. Tungsten-platinum.
C. Chromium-platinum.
D. Steel-tungsten.
Answer: A. Chromium-molybdenum.
Explanation:
Super heater:
- The steam produced in the boiler is wet and is passed through a super heater where it is dried and superheated by the flue gases on their way to the chimney.
- Superheating provides two principal benefits. Firstly, the overall efficiency is increased.
- Secondly, too much condensation in the last stages of the turbine is avoided.
- The superheated steam from the super heater is fed to the steam turbine through the main valve.
- Steam produced from a boiler without a super heater will either be dry saturated or more likely, wet.
- In works where steam is transmitted over long distances, the Inevitable heat loss from pipe surfaces causes the steam to become even wetter at the point of use unless a super heater is fitted to the boiler plant.
- This is a separate battery of pipes placed near the boiler furnace through which steam passes to receive additional heat by either convection or radiation.
- The super heater increases the surface area capable of accepting heat and the production of heat also slightly increases the thermal efficiency of the boiler.
- In steam power station super heater consists of group of tubes made of Chromium-molybdenum.
