Exhaust Gas Characteristics of Methane Clustered Microflames Established on 3 x 3 Array of Micro Burners

Methane flames have been successfully established on the 3 x 3 array of micro burners with a burner diameter of 0.07 mm, even though this burner diameter is smaller than the smallest burner diameter to establish a methane flame. This means that the burner pitch of 2.5 mm is close enough to cause flame-flame interaction to get over the limit of burner diameter and establish clustered microflames. It is found that the NOx emission from clustered microflames is quite low, as low as 6 to 10 ppm at 0% O2, while the CO emission is high level. The NOx and CO emissions from the clustered microflames show different correlation line from other types of burner flames including diffusion microflame.