To reduce the generation of NOx while low combustible fuel and high combustible fuel are both stabilized.
A burner comprises a low combustible fuel injection part So to inject low combustible fuel in such a manner that a plurality of low combustible fuel injection flows are formed in an arranging state in a peripheral direction and each combustible fuel injection flow is formed in such a state that it is spread toward a spot situated downstream of an injection direction, a high combustible fuel feed part to feed high combustible fuel in such a manner that a high combustible fuel flame Fn is formed between the low combustible fuel injection flows, and an air feed part to feed combustion air so that a low combustible fuel is burnt in such a manner that a plurality of low combustible fuel flames Fo are arranged in a peripheral direction and formed in a spreading state that the flames are more separated from each other toward the end and high combustible fuel is burnt in such a manner that a high combustible flame Fn is formed between adjoining low combustible fuel flames Fo.
ICHIKI KOICHI
DEGUCHI MASAKAZU
SUNRAY REINETSU CO