Experimental research on the influence of the excess air coefficient on boiler heat loss

The influence of excess air coefficient on heat loss from exhaust gas, heat loss from gas incomplete combustion, and heat loss from solid incomplete combustion was analyzed by carrying out the thermal balance experiment of the boiler. The results showed that heat loss from exhaust gas increased with an increase in the excess air coefficient. Heat loss from gas incomplete combustion and heat loss from solid incomplete combustion first decreased and then increased. There existed an optimum excess air coefficient corresponding to the minimum heat loss of the boiler. As a result, the excess air coefficient has an important effect on the thermal efficiency of the boiler. Under the condition of complete combustion of adequate oxygen and fuel as much as possible, the excess air coefficient is lower and the combustion is more economical.