| 摘要 |
PROBLEM TO BE SOLVED: To suppress the generation of NOX and to make it possible to stably burn with a high load by providing a recess at the upper surface of a burner body, perforating a plurality of burner ports on the wall surface in the recess, and injecting premixed gas mixed with the air of a specific ratio or less with respect to the theoretical combustion air quantity from the burner port. SOLUTION: A recess 3 is provided on the upper surface of a burner body 1 above which a material to be heated is disposed. A plurality of burner ports 4 are perforated on the wall surface in the recess 3, and premixed gas mixed with the air amount near the theoretical value (within±30% of theoretical air amount) to the low pressure gas (300mmHg2 O or less) such as city gas is injected from the port 4. Accordingly, since the secondary air is hardly supplied to the space between the recess 3 or the upper surface 2 of the burner body 1 and a material to be heated during burning, the combustion is completed without supplying the air more than necessary but sufficient for the combustion to the flame. Therefore, the generation of NOX due to the excess supply of oxygen is suppressed to make it possible to stably burn at a high load.
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