Where is the exhaust steam from a high-pressure turbine routed for reheating _____________________?
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Answer: E. a separate coil located in convection path
Explanation
High-pressure steam requires reheating to improve thermodynamic cycle efficiency and prevent excessive moisture in turbine blades. The convection path of a boiler provides the necessary high-temperature flue gases for effective thermal transfer. A separate reheater coil placed specifically in this region ensures the steam temperature rises without pressure loss. Reheating is a standard practice in modern high-pressure steam power plants utilizing the Rankine cycle. The convection path contains combustion gases that have already passed through the radiant furnace zone. Superheater and reheater tubes are constructed from specialized alloy steels to withstand extreme temperatures.
Reheating steam increases the overall thermal efficiency of large power generation plants significantly. Preventing moisture condensation on low-pressure turbine blades protects expensive equipment from erosion damage. Power plant operators closely monitor reheater temperatures to maintain optimal turbine performance. Option A is incorrect because the boiler drum primarily stores and separates saturated water and steam mixtures. Option B refers to initial steam superheating rather than the intermediate reheating process of turbine exhaust. Option D lacks the crucial spatial detail regarding where the coil is positioned inside the flue gas path.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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