| 摘要 |
PURPOSE:To provide a burner having a less amount of occurrence of NOx and a low combustion sound by a method wherein a rich combustion with a low air excessive rate under a state in which a combustion flame adhered to a rich combustion wall surface is formed, this combustion flame is applied as a holding flame and a lean combustion having a high air excessive rate is carried out under a state in which a combustion flame adhered to a lean combustion wall surface is formed. CONSTITUTION:Rich combustion mixture gas discharged from each of rich combustion flame ports 8 along a rich combustion wall surface 9S is mixed with rich combustion secondary air discharged from each of a rich combustion secondary air discharging port 11 and an auxiliary rich combustion secondary air discharging port 12 and then a rich combustion with a low air excessive rate is carried out under a state in which a combustion flame Hc adhered to the rich combustion wall surface 9S is formed. Then, the lean combustion mixture gas is discharged from a lean combustion flame port 13 and auxiliary lean combustion flame ports 14, 15, the combustion flame Hc adhered to the rich combustion wall surface 9S and ignited there is applied as a holding flame and then a lean combustion with a high air excessive rate is carried out under a state in which a combustion flame Hr adhered to the lean combustion wall surface 10S is formed. |
