What is the best choice for the chemical oxygen scavenger addition point?

Adding a chemical oxygen scavenger at the feedwater tank or deaerator storage section is ideal for several reasons. The primary purpose of a chemical oxygen scavenger is to remove dissolved oxygen from the boiler feedwater before it enters the boiler. When oxygen is present in the feedwater, it can lead to corrosion within the boiler system, which can ultimately result in equipment damage and efficiency losses.

By incorporating the oxygen scavenger at the feedwater tank or deaerator stage, the treatment process begins early, allowing for effective oxygen removal before the feedwater enters the boiler. The deaerator plays a critical role in the removal of dissolved gases, including oxygen and carbon dioxide. Introducing the scavenger here ensures that it can act on any residual oxygen present in the water, thus maximizing its effectiveness and providing a more consistent level of protection against corrosion throughout the system.

Moreover, adding the scavenger at this point allows for better mixing and reaction time, enhancing the chances of a complete reduction of oxygen. This location also allows for easier monitoring and adjustment of chemical dosing, ensuring that optimal levels of the scavenger are maintained based on the varying conditions of the feedwater.

Other points in the system, such as the boiler drum or downstream of the economizer,