COMBUSTION METHOD FOR BURNER FOR FORMING TUBULAR FLAME, AND BURNER FOR FORMING TUBULAR FLAME

PROBLEM TO BE SOLVED: To provide a combustion method for forming a tubular flame, which can form such a tubular flame properly as floats from the inner face of a combustion chamber.SOLUTION: A side part introduction gas is introduced in a tangential direction of an inner surface of a combustion chamber N1 into the inside of a cylindrical combustion chamber N1 having one end closed, from an introduction port 7 opened in the side surface part of the cylindrical combustion chamber N1, and an end part introduction gas is introduced from the end part of the closed side of the combustion chamber N1 along the cylindrical shaft center direction of the combustion chamber N1 into the cylinder shaft part of the combustion chamber N1. The oxygen ratio indicating the ratio of the actual oxygen amount contained in the side part introduction gas to the stoichiometric oxygen amount of the fuel contained in the side introduction gas is set at a combustion restricting oxygen ratio lower than the lower limit, at which the fuel can burn. At the same time, the introduction amount of the end part introduction gas is determined so that the oxygen ratio indicating the ratio of the actual oxygen amount, which is obtained by adding each oxygen amount contained in the side part introduction gas and the end part introduction gas, may be a burning oxygen ratio higher than the combustion limiting oxygen ratio with respect to the stoichiometric oxygen amount of the fuel contained in the side introduction gas. 【課題】燃焼室の内面から浮上した管状の火炎を的確に形成することができる管状の火炎を形成するバーナの燃焼方法を提供する。【解決手段】一端が閉塞された円筒状の燃焼室Ｎ１の側面部に開口する導入口７から燃焼室内面の接線方向に向けて、側部導入気体を燃焼室Ｎ１の内部に導入し、且つ、燃焼室Ｎ１の閉塞側の端部から燃焼室Ｎ１の筒軸心方向に沿って、端部導入気体を燃焼室Ｎ１の筒軸心部に導入し、側部導入気体に含まれる燃料の理論酸素量に対して側部導入気体に含まれる実酸素量の割合を示す酸素比を、燃料が燃焼可能な下限よりも低い燃焼制限用酸素比に設定し、且つ、側部導入気体に含まれる燃料の理論酸素量に対して側部導入気体と端部導入気体との夫々に含まれる酸素量を合わせた実酸素量の割合を示す酸素比が燃焼制限用酸素比よりも高い燃焼用酸素比となるように、端部導入気体の導入量を定める。【選択図】図２