Burner with variable volume combination chamber

A burner for an industrial furnace, comprising:

• a first burner portion located outside the furnace, the first burner portion having first connector means for feeding a fuel, second connector means for feeding air, and third connector means for electrical energy;
• a first tube mounted to said first burner portion and having a free end within the furnace, said first tube being operatively connected to said second connector means for feeding the air;
• a second tube extending within said first tube, and having a first end which is operatively connected to said first connector means;
• a radial plate mounted within said first tube, said radial plate having an opening therethrough operatively connected to said first connector means for feeding a fuel and through which the fuel may pass, and said plate permitting the air to pass thereby to reach said free end of said first tube such that the portion of the first tube extending between said free end and said radial plate, together with said radial plate, defines a combustion chamber;
• an ignition chamber arranged on said radial plate adjacent said combustion chamber;
• an electrode mounted within said ignition chamber and operatively connected to said third means feeding electrical energy;
• and
• tube mounting means, permitting operative mounting of said second tube at various longitudinal positions within said first tube with respect to said free end, for varying the volume of said combustion chamber.