What is an essential feature of a superheater operation?

The essential feature of superheater operation is a properly operating drain system. Superheaters are used in steam boilers to increase the temperature of the steam generated by the boiler. It is crucial to remove any water that may not have converted to steam during the heating process. If water accumulates in the superheater, it can lead to inefficiencies, such as water hammer or thermal shock, which may damage the equipment and reduce the overall effectiveness of the boiler system.

A well-functioning drain system ensures that any residual water is effectively removed, allowing only dry steam to pass through the superheating stage. This is vital for maintaining the efficiency and safety of the steam generation process. Without a proper drainage mechanism, the system could become compromised, leading to potential operational issues and hazards.

In contrast, the other options do not represent essential features of superheater operation. While consistent water supply is crucial for the boiler itself, the superheater specifically needs to deal with steam. The use of only steam in operation might seem correct, but it does not address the necessary removal of water from the superheater. Direct exposure of steam to external air is counterproductive, as it would cause heat loss and reduce efficiency. Hence, the effectiveness of a properly operating drain