BOILER HAVING WATER TUBE GROUP

摘要

PROBLEM TO BE SOLVED: To stabilize the combustion flame and the combustion gas flow which are symmetric to the axis of a burner and powerful by preventing the oscillating combustion caused by a back flow from a nozzle of the burner of a heat collection water tube insertion type combustion chamber. SOLUTION: In the heat collection water tube insertion type combustion chamber of a boiler, a restriction space if formed in contact with and in the vicinity of the nozzle of the burner irrespective of the flame ejected from the burner.