One-point advice for effectively using a combustion exhaust gas analyzer, free download!
The actual air ratio of the boiler can be calculated based on the exhaust gas oxygen concentration (O2 %) measured by a combustion gas analyzer.
Below, we will describe the basic concepts regarding the air ratio and its calculation formula.
The theoretically required amount of air calculated from the fuel composition is called the theoretical air amount. However, in practice, it is difficult to achieve complete combustion with only this theoretical air amount, so a little excess air is actually supplied to the burner. This actual amount of air is referred to as the actual air amount. The air ratio is defined as the value obtained by dividing the actual air amount by the theoretical air amount. As the air ratio increases, the amount of exhaust gas increases proportionally, leading to an increase in exhaust gas losses. Therefore, the Energy Conservation Act specifies the standard air ratio as follows.
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