New York Low Pressure Boiler COF Practice

How does the DA effectively remove non-condensables from water?

1. By cooling the water

2. Using centrifugal force and differential pressure

3. By filtering the steam

4. Through chemical reactions

The correct answer is: Using centrifugal force and differential pressure

The removal of non-condensables from water is effectively achieved through the process of utilizing centrifugal force and differential pressure. In a deaerator (DA), non-condensables like air and other gases can significantly impact water quality and boiler efficiency. The design of the deaerator creates conditions where the water is subjected to centrifugal forces, which help separate non-condensable gases from the liquid water. Additionally, differential pressure plays a crucial role in facilitating the movement of these gases out of the water. In essence, the deaerator operates by raising the pressure of the water while promoting the escape of dissolved gases, ensuring that the final water quality is high enough for efficient boiler operation. This mechanism ultimately contributes to the prevention of issues such as corrosion and reduced heat transfer efficiency in the boiler system. The other options address different processes that do not directly pertain to the effective removal of non-condensables in this context. Cooling the water, for instance, might have the opposite effect and could promote gas solubility instead. Filtering is typically more related to solid particle removal rather than gas separation, and chemical reactions generally pertain to altering the properties of the water or contaminants rather than physically expelling gases.