In flue gas analysis, what is considered a good percentage of CO2?

In flue gas analysis, a good percentage of CO2 is typically in the range of 12%-15%. This percentage indicates that the combustion process is efficient, as it shows that a significant amount of the fuel has been converted into carbon dioxide during burning. An optimal CO2 percentage also helps in minimizing emissions of harmful gases such as carbon monoxide (CO) and unburned hydrocarbons, which are produced when combustion is not complete.

When CO2 levels are too low, it may suggest that the combustion process is incomplete, leading to wasted fuel and increased emissions. Monitoring CO2 levels is crucial in stationary engineering, as it can inform operators about the efficiency of the boiler or furnace, ensuring that equipment runs safely and effectively while adhering to environmental regulations.