At the waste-gas burner, what does a predominantly blue flame indicate?

A predominantly blue flame at the waste-gas burner is indicative of good methane production. When methane is burned effectively, it reacts with oxygen to produce carbon dioxide and water, resulting in a blue flame. This color indicates that the combustion process is efficient and that there is sufficient oxygen for the complete combustion of methane.

In contrast, a yellow or orange flame often signifies incomplete combustion, which can occur if there is a lack of oxygen or if there are impurities in the gas being burned. Therefore, observing a blue flame is a positive sign, as it suggests that the methane present is being effectively utilized and that the combustion process is operating as intended. This is crucial for achieving optimal energy output and minimizing harmful emissions.