Which component is primarily responsible for supplying high-pressure water to the boiler?

The feedwater pump is crucial for supplying high-pressure water to the boiler. Its primary function is to take water from the feedwater system, which may include the condensate return system, and pressurize it sufficiently so that it can enter the boiler. High-pressure water is necessary to ensure that the water can reach the elevated temperatures and pressures found in a boiler for efficient steam generation.

The design of the feedwater pump allows it to convert mechanical energy into hydraulic energy, effectively overcoming the pressure drop that occurs in the system as water moves from the feedwater source to the boiler. This ensures a consistent supply of water, which is essential for maintaining the boiler's operation and efficiency.

While the condensate return system is involved in recycling water back to the feedwater system, it does not pressurize the water. The draft fan's role is to create airflow necessary for combustion but does not interact directly with the pressurization of water. Control valves are used to regulate the flow and pressure in the system, but they do not supply water themselves. Thus, the feedwater pump stands out as the key component responsible for delivering high-pressure water needed for boiler operation.