What is the role of an air separator in a boiler system?

The correct choice highlights the primary function of an air separator in a boiler system, which is to remove air and gases from the boiler water. In a closed-loop boiler system, unwanted air and gases can accumulate, leading to inefficient operation and potential damage. The presence of air in the system can cause corrosion, reduce heat transfer, and create steam bubble formation that disrupts water circulation.

By segregating and expelling these gases, the air separator ensures that the boiler operates with optimal efficiency and safety. Maintaining the water free from entrained air helps to preserve the integrity of the system and prolong the life of boiler components.

Other functions mentioned in the choices, like filtering boiler water of impurities or enhancing water treatment chemicals, do not align with the primary task of an air separator. Regulating steam pressure typically involves mechanisms like pressure relief valves or control systems rather than an air separator. Thus, the focus on removing air and gases makes the correct choice directly related to the air separator's vital role in ensuring the successful operation of a boiler system.