What is the primary function of a baffle in a steam drum?

The primary function of a baffle in a steam drum is to separate steam and water. In a steam drum, which is part of a boiler system, baffles create barriers that help in the effective separation of steam from the water. As the steam rises, the presence of baffles slows the movement of water, allowing steam to escape more efficiently and ensuring that the water remains adequately mixed and does not escape with the steam. This separation is crucial for maintaining proper pressure and temperature in the boiler system, which is necessary for effective operation and efficiency of the steam generating process.

In this context, the other options do not accurately reflect the role of a baffle within a steam drum. Chemical feed relates to water treatment processes and is not directly tied to a baffle's function. Controlling water flow is more about overall system design rather than the specific action of baffles, which focus on steam and water separation. While blowing off impurities is a necessary process in a steam drum, it is performed by a different system element, such as blow-off valves, rather than baffles.