Combustion device for melting furnace, and melting furnace

A combustion device for a glass melting furnace in which a fuel ejector for ejecting gas fuel into a combustion space above an area of a melting zone in which an object to be melted as a glass material is present is disposed, the fuel ejector having a fuel ejection nozzle disposed in a wall of the furnace to eject the gas fuel from a lateral location in the combustion space, and

• in which a combustion air feeder for feeding combustion air obliquely downward to the combustion space has an air port that is disposed in a wall of the furnace in a location separate from and above the fuel ejection nozzle, wherein
• the fuel ejector comprises a first fuel ejector and a second fuel ejector lined up in one specific direction, as viewed in the lengthwise direction of fuel ejection;
• a plurality of fuel ejection orifices are lined up in an orthogonal direction orthogonal to the specific direction as viewed in the lengthwise direction of fuel ejection, in each of the first fuel ejector and the second fuel ejector, and in relation to the first fuel ejection orifices positioned on one side and second fuel ejection orifices positioned on the other side thus forming a pair in the specific direction,
• a first ejection stream ejected from the first fuel ejection orifices and a second ejection stream ejected from the second fuel ejection orifices are configured so as to collide on the downstream side of ejection between the fuel ejection orifices constituting a pair;
• the plurality of first fuel ejection orifices provided to the first fuel ejector and the plurality of second fuel ejection orifices provided to the second fuel ejector are configured to widen in a radial fashion on the downstream side of ejection or to converge inside a predetermined range as viewed in the specific direction;
• the amount of gas fuel of the first ejection stream ejected from the first fuel ejection orifice positioned to one side in the specific direction and the amount of gas fuel of the second ejection stream ejected from the second fuel ejection orifice positioned to the other side are configured so as to be capable of being mutually or independently adjusted;
• and
• all of the combustion air introduced to the combustion space is fed from the combustion air feeder.