What is a feedwater heater?

A feedwater heater is a device that preheats water entering the boiler. This process is essential for improving the efficiency of the boiler system. By raising the temperature of the feedwater before it reaches the boiler, the amount of energy required to convert the water to steam is reduced. This not only increases the overall efficiency of the boiler but also helps reduce fuel consumption and resulting emissions.

Preheating the feedwater minimizes thermal shock in the boiler, which can be particularly damaging due to rapid temperature changes. Additionally, when the water is preheated, it can help improve the quality of steam production by preventing oxygen and other impurities from entering the boiler system at high temperatures, thus promoting better operational reliability and longevity of the equipment.

The other choices, which refer to filtering the water, cooling it, or controlling boiler pressure, do not accurately describe the function of a feedwater heater, emphasizing the specific role of this device in enhancing boiler performance.