How does a pressure control system function in a boiler?

A pressure control system in a boiler is designed to maintain a consistent steam pressure, which is crucial for the safe and efficient operation of the boiler. This system works by continuously monitoring the steam pressure within the boiler and making real-time adjustments to the fuel supply to ensure that the pressure remains within the desired range.

When the pressure begins to drop below the set point, the system enhances the fuel flow to the burners, which increases the heat output and, consequently, the steam pressure. Conversely, if the pressure rises above the set point, the system reduces fuel flow, thereby decreasing heat input and allowing pressure to fall back to the desired level. This automatic adjustment ensures that the boiler operates effectively under varying load conditions, prevents overheating, and helps in maintaining safety standards.

Options that focus on maintaining fuel levels, adjusting pump speed, or monitoring flue gas temperatures relate to different aspects of boiler operations but do not directly address the mechanism of pressure control itself. Maintaining fuel levels is important but is not the primary function of a pressure control system. Adjusting pump speed relates to water circulation and does not provide pressure adjustments directly. Monitoring flue gas temperatures serves more to gauge combustion efficiency rather than to control steam pressure. Thus, option C accurately reflects the specific function of