Water treatment chemicals are injected:

Water treatment chemicals are injected using an internal feed pipe located near the feedwater line because this method ensures the chemicals are thoroughly mixed with the incoming feedwater before they enter the boiler. This is crucial for effective treatment, as it allows the chemicals to address issues such as corrosion, scaling, and biological growth throughout the entire water system.

Injecting chemicals in the feedwater line allows for optimal distribution, ensuring that the treatment process begins immediately. It enhances the efficiency of the chemicals, as they can neutralize impurities efficiently before they have the opportunity to form deposits or cause damage within the boiler itself.

In contrast, injecting chemicals into locations such as the mud drum, risers, or steam space would be less effective. These areas are not optimal for the thorough mixing and would lead to uneven treatment and potential inadequacies in addressing water quality issues throughout the entire system. By choosing the internal feed pipe near the feedwater line, operators ensure a more controlled and effective treatment process.