1. What are platens? Where are they used?
2. Where is reheater located?
3. What is a closed loop control? What is proportional control?
4. How is the water level in steam drum controlled?
5. What is a “boiler master”? How is steam pressure controlled?
6. What are the different methods of controlling the superheat (and reheat) temperature of steam?
7. Explain the operation of a spray-type desuperheater.
8. Why is the desuperheater located before the last stage of superheating?
9. Explain the steam temperature control by gas recirculation. What is gas tempering?
10. What are tilting burners?
11. What is the function of air preheater? How does air preheating save fuel?
12. What are recuperative air preheaters? Why are baffles provided? Why is the overall heat transfer coefficient in APH low?
13. Explain the operation of Ljungstrom (regenerative) air preheaters. What are their advantages and disadvantages?