What is the approximate amount of excess oxygen required for combustion of gaseous fuel?

The combustion of gaseous fuel requires a certain amount of excess oxygen to ensure that the fuel burns completely and efficiently. The range of 3 to 10% excess oxygen is generally considered sufficient for most gaseous fuel combustion processes. This level allows for enough oxygen to react with the fuel while also accounting for variations in fuel quality and combustion conditions.

In practice, maintaining this range helps avoid incomplete combustion, which can lead to the production of harmful emissions like carbon monoxide and unburned hydrocarbons. Additionally, it supports overall combustion efficiency, ensuring that the energy from the fuel is maximized and that the system operates safely.

The other ranges provided do not align as closely with standard practices for excess oxygen in gas combustion. For instance, 6 to 8% may be on the higher end, while 10 to 15% could indicate a potential inefficiency or risk of excessive oxygen leading to heat losses. In industrial applications, careful monitoring and control of the air-fuel mixture are essential, making the 3 to 10% range the most applicable choice for optimal combustion performance.