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Micromixing injection combustion is an effective low-NO x combustion technology, but a high wall temperature near the burner nozzle exit is detrimental to the nozzle and will affect burner safety in this technology. In this paper, CO 2 dilution and micromixing injection combustion were combined to try to reduce NO x emissions and lower the wall temperature near the nozzle exit. Several experimental results for flames with a thermal power of 20 kW are reported as follows: the wall temperature near the nozzle can be lowered effectively by CO 2 dilution combustion. The more diluent there is, the lower the wall temperature near the nozzle exit can be. Both low NO x and CO emissions can be achieved at the same time. By adjusting the combustion parameters, NO x emissions can be reduced to 2 ppm (15% O 2 ), and the CO emissions can be reduced to 3 ppm (15% O 2 ). In terms of the relationship between NO x and CO emissions and diluents, more diluents can lead to lower NO x emissions but can increase the CO emission. The hydrocarbon ratio of the diluted fuel can affect the wall temperature and the NO x and CO emissions. When the C/H ratio is high, the wall temperature of the nozzle is high and the NO x and the CO emissions increase.

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