Boiler Tube Diameter Comparison
Natural circulation boilers typically require larger diameter tubes compared to controlled circulation boilers.
Natural Circulation Tubes
- Circulation depends on the density difference between the steam-water mixture in riser tubes and the denser water in downcomers.
- Larger diameters are needed to ensure adequate flow velocity.
- This prevents issues like steam blanketing, ensuring effective heat transfer.
Controlled Circulation Tubes
- Circulation is maintained by pumps, providing forced flow.
- Smaller tube diameters can be used effectively.
- Higher velocities are achieved, enhancing heat transfer and control.
Therefore, for effective operation driven solely by natural forces, larger diameter tubes are necessary in natural circulation boilers.
Important Questions from Boilers
A device which is used to drain off water from steam pipes without escape of steam is called
Which of the following pipe joints would be suitable for pipes carrying steam?
Filling or decking in a cooling tower increases the rate of heat transfer by providing
The valves mounted on the boilers which change the direction of flow of steam by 90° and valves fitted in the pipelines which allow the steam in the same direction are respectively called as _____.
Which of the following are boiler mountings and not boiler accessories?
A. Pressure gauge
B. Air preheater
C. Superheater
