What can excessive opacity limits indicate in a boiler operation?

Excessive opacity limits in a boiler operation are primarily associated with poor air control. Opacity refers to the amount of light obscured by smoke or particulate emissions from the boiler. When air control is inadequate, it often results in incomplete combustion of fuel, leading to an increase in smoke and particulate matter released into the atmosphere. This incomplete combustion can produce higher levels of opacity, indicating that the combustion process is not efficient and may require adjustments to the air-to-fuel ratio.

Effective air control ensures that there is sufficient oxygen available for the complete combustion of fuel, reducing emissions and maintaining boiler efficiency. Therefore, monitoring opacity helps operators gauge air control effectiveness and make necessary adjustments to optimize performance and minimize environmental impact.