What is the role of a feedwater heater in improving boiler efficiency?

• A. It reduces the boiler's required pressure
• B. It preheats the water entering the boiler, reducing fuel consumption
• C. It increases the steam pressure produced
• D. It regulates the flow of feedwater into the boiler

Answer: (B)

The role of a feedwater heater in improving boiler efficiency is primarily to preheat the water entering the boiler, which leads to a reduction in fuel consumption. By raising the temperature of the feedwater before it enters the boiler, the heater ensures that less energy is needed to convert the water into steam. This preheating process takes advantage of the heat that is otherwise lost in the system, such as heat from flue gases or steam, thus improving overall energy use and reducing the amount of fuel required for the heating process.

When the feedwater enters the boiler at a higher temperature, it helps to minimize the thermal shock to the boiler components and improves the overall heat transfer efficiency within the boiler. This results in a more efficient steam production process, leading to cost savings and enhanced performance of the entire boiler system.