VERY LOW CALORIE GAS BURNER STRUCTURE AND BURNER DEVICE

PROBLEM TO BE SOLVED: To provide a very low calorie gas burner structure and a burner device facilitating diffusive mixing of a very low calorie gas and air, and improving combustion efficiency.SOLUTION: In the very low calorie gas burner structure 1, a very low calorie gas including more inert components than combustible components and difficult in self-sustaining combustion is used as a fuel. The very low calorie gas burner has a double pipe structure constituted of concentric inner pipe 2 and outer pipe 3. A first gas flow channel to which the very low calorie gas is supplied, is disposed in the inner pipe or one of the inner pipe and the outer pipe. A second gas flow channel to which the air is supplied, is disposed in the inner pipe or one of the outer pipe and the inner pipe. A cross-sectional area of the first gas flow channel is larger than a cross-sectional area of the second gas flow channel. A swirler 7 is disposed at a burner opening side of the inner pipe.