JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV POWER PLANT ENGINEERING Previous Question Paper (July/August - 2022 - R18)
Answer any five questions. All questions carry equal marks.
Main
Draw a neat line diagram of in plant coal handling and indicate the name of equipments used at different stages?
Answer
The coal handling process involves several stages to transport coal from the storage site to the boiler furnace. The sequence of equipment is as follows:
- Coal Unloading: Coal is received via rail or truck and unloaded using wagon tipplers or track hoppers.
- Coal Preparation: The coal is passed through crushers to achieve a uniform size suitable for combustion.
- Coal Transfer: Belt conveyors and bucket elevators transport the coal from the unloading area to the storage yard or the plant bunker.
- Storage: Coal is stored in dead storage (long-term) or live storage (bunkers) for immediate use.
- Feeding: Coal feeders regulate the flow of coal from the bunkers to the pulverizing mills.
- Pulverization: Pulverizing mills grind the coal into a fine powder to increase surface area for efficient combustion.
Differentiate between over feed and under feed coal beds used in steam boilers.
Answer
| Feature | Overfeed Coal Bed | Underfeed Coal Bed |
|---|---|---|
| Coal Feeding | Coal is supplied from above the grate. | Coal is supplied from below the grate. |
| Combustion Process | Fresh coal is added to the top; volatiles must pass through the hot bed, reducing smoke. | Fresh coal is pushed from below; volatiles pass through the incandescent zone, ensuring complete combustion. |
| Ash Handling | Ash is removed from the bottom of the grate. | Ash is pushed to the sides or top for removal. |
| Air Supply | Air passes through the grate and the fuel bed. | Air is supplied through tuyeres at the sides of the fuel bed. |
| Efficiency | Generally lower due to potential for incomplete combustion of volatiles. | Higher efficiency as volatiles are burned effectively in the hot zone. |
Explain about the present position of power in India. With valid reasons explain whether India will face power crisis in future or not.
Answer
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On what factors, coal is selected for steam power plants. Explain?
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Explain with the help of a block diagram the fuel storage and supply system of diesel power plant.
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What is supercharging of diesel power plant? Explain methods of supercharging.
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Why lean air fuel ratio is used in gas turbines?
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Explain with neat sketch, combustion chamber used in open cycle gas turbine power plant.
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What is flow duration curve? What are the uses of flow duration curve?
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What are the various factors to be considered in selecting the site for a hydroelectric power plant and discuss briefly about primary and secondary investigations.
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Explain with a simple sketch, working of high hydroelectric power plant.
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Explain the factors affecting the run-off in hydrological cycle.
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What is Boiling Water Reactor? How does it differ from Pressurized Water Reactor?
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How to dispose the radioactive waste from the nuclear power plants? Explain them.
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Explain how the NOx emissions can be reduced in the flue gases.
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What do you understand by load factor and capacity factor? When are they numerically equal?
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