What is the ideal percentage of CO2 for flue gases, according to the provided information?

The ideal percentage of CO2 for flue gases is typically around 20%. This percentage indicates efficient combustion in a furnace or boiler, where enough oxygen is present to allow for complete combustion of the fuel. When the flue gas contains about 20% CO2, it suggests that the system is performing optimally, maximizing energy output while minimizing emissions.

An optimal CO2 level helps in achieving a balance in combustion efficiency, ensuring that the fuel is being used effectively. If the CO2 percentage is lower, it could suggest that there is excess air or unburned fuel, which can lead to decreased efficiency and higher emissions. Conversely, if the CO2 is significantly higher, this might indicate incomplete combustion, potentially resulting in the production of harmful pollutants.

Understanding the ideal CO2 percentage is critical for stationary engineers as it helps in maintaining the performance of heating systems, ensuring both operational efficiency and environmental compliance.