Which type of heater is commonly used to ensure the quality of feedwater in steam boilers?

The deaerating heater is commonly used to ensure the quality of feedwater in steam boilers by removing dissolved gases, particularly oxygen and carbon dioxide, from the water. These gases can cause significant corrosion in boiler systems, leading to decreased efficiency and damage over time.

In the deaerating process, feedwater is heated and agitated to facilitate the removal of these gases. By using steam to heat the feedwater, the temperature is raised, and the solubility of gases decreases, allowing them to escape from the water efficiently. This process helps maintain the integrity of the boiler system and improves overall performance by enhancing the quality of the feedwater entering the system.

Other types of heaters, such as flash heaters, direct contact heaters, and heat exchangers, serve different functions but do not specifically target the removal of dissolved gases in feedwater, which is the critical aspect of maintaining boiler quality.