Practice shows that opening the heat dissipation fan will significantly reduce the burner thermal efficiency and increase the flue gas CO concentration.Therefore,this paper adopts an experimental method to investigate the effects of the shape and area of the air vent and the angle of the deflector plate of the heat dissipation fan on the performance of the burner.Three different shapes of air vents(rectangular,curved and trapezoidal)were used to investigate the variation of the thermal efficiency of the burner in relation to these factors at different vent areas and different deflector angles.It was found that compared to trapezoidal and curved vents,rectangular vents would be less capable of absorbing high temperature flue gases from the bottom of the pot,resulting in the highest burner efficiency of 67.3%.The area of the air vent has a significant effect on the thermal efficiency of the burner with the curved air vent.Appropriate reduction of the area of the air vent reduces the amount of high-temperature flue gas from the bottom of the pot,leading to a reduction in the amount of high-temperature flue gas leakage,thus improving the thermal efficiency.In the air vent using the deflector plate angle of 15～45°,can reduce the bottom of the high-temperature flue gas roll suction,improve the thermal efficiency of the burner.
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