What is the purpose of water drum in boiler?
A steam drum is a standard feature of a water-tube boiler. It is a reservoir of water/steam at the top end of the water tubes. The drum stores the steam generated in the water tubes and acts as a phase-separator for the steam/water mixture.
What is the meaning of the capacity of a boiler?
Since the amount of steam delivered varies with temperature and pressure, a common expression of the boiler capacity is the heat transferred over time expressed as British Thermal Units per hour. A boilers capacity is usually expressed as kBtu/hour (1000 Btu/hour) and can be calculated as. W = (hg – hf) m (1)
How do you control drum level?
Three-element Control:
- Disturbances in drum level are caused by fluctuations in main steam flow.
- Figure 1 shows a typical drum level controller, which measures the drum level (1), main steam flow (2), and feedwater flow (3) and manipulates the feedwater control valve to regulate the drum level.
What height should a boiler drum be?
50 M
The boiler drum is erected at site at a height of 50 M ap- proximately. For this purpose heavy cranes are employed- since this is a massive component.
What causes boiler carryover?
Mechanical causes of carryover include boiler design, high water level, firing method, and load characteristics. Chemical causes of carryover include high solids concentration (dissolved or suspended), excessive alkalinity, grease, oil, or other contamination.
How do you control silica in a boiler drum?
After silica enters the boiler water, the usual corrective action is to increase boiler blowdown (to decrease the boiler water silica to acceptable levels) and then to correct the condition that caused the silica contamination.
How do you calculate boiler size?
Multiply your square footage by 50 to determine the size of your boiler. For instance, if you house is 1,103 square feet, your heater should be at least 55,150 Btu.