What is the ideal carbon dioxide level of flue gases for natural gas?

The ideal carbon dioxide level of flue gases for natural gas combustion typically falls within the range of 10 to 12%. This range indicates efficient combustion, as it reflects that the natural gas is being burned effectively with sufficient oxygen present, leading to the production of carbon dioxide as a primary exhaust gas.

When flue gases contain approximately this amount of carbon dioxide, it suggests that the combustion process is optimized, resulting in maximum energy extraction from the fuel while minimizing the production of harmful emissions. Higher levels of carbon dioxide could indicate incomplete combustion or insufficient oxygen, which may lead to increased emissions of pollutants such as carbon monoxide and unburned hydrocarbons.

The other ranges provided in the options do not align with the typical emissions associated with efficient natural gas combustion, with values outside the 10 to 12% range generally indicating operational issues or variations in combustion efficiency.