What is the main purpose of a deaerating heater?

The main purpose of a deaerating heater is to remove air from water. In power plants and other industrial applications, water is typically used in boilers, steam systems, and other processes. If air (particularly oxygen and carbon dioxide) is not removed from the water, it can lead to corrosion of the metal components in the system, which can significantly reduce their lifespan and impair efficiency.

A deaerating heater operates by heating the water in a controlled environment where air can be effectively vented or displaced from the water. This process involves both heating the water to reduce the solubility of the gases and then creating a low-pressure environment to encourage the removal of these gases. The reduction of dissolved gases minimizes the risk of corrosion and improves the overall performance of the system.

In contrast, the other options do not accurately describe the primary function of a deaerating heater. While maintaining water temperature or cooling water may be relevant in various contexts, they are not the main objectives of a deaerating heater. Similarly, reducing water pressure is typically handled by different types of equipment designed specifically for pressure control. Thus, the focus on the removal of air from water highlights the critical role of the deaerating heater in maintaining system integrity and efficiency.