COMBUSTION DEVICE FOR BOILER HAVING WATER TUBE GROUP AND COMBUSTION METHOD OF BOILER EMPLOYING THE SAME COMBUSTION DEVICE

摘要

PURPOSE: To provide a burner body-type boiler, wide in combustion range and turn down, stabilized in combustion and low in the noise thereof. ;CONSTITUTION: A part called as a burner is eliminated and an air supplier 2 and a fuel supplier 3 are provided at the upstream side of the group of water tubes to mix air and fuel in the group of water tubes or air and oxygen are premixed in the fuel supplier 3 to burn it, further, one layer or a plurality of stages of layers of combustion layers are provided in the group of water tubes in the direction of flow of gas to premix the fuel and supply it by distributing it into single or plurality of stages of fuel supplying tubes 3, arranged at the upstream side or in the group of water tubes, or the fuel and the air are supplied into the fuel supplying tube 3 to inject the mixture to the surface of the tube individually. Further, the group of water tubes, satisfying a formula L≥3D, P≥2D, and provided with projected parts on the outer surface of the water tube or the fuel supplying tube 3, is provided. In this case, L means a distance from the fuel supplying tube 3 of respective stages to a first stage water tube 1, P means the pitch of the group of water tubes and D means the diameter of the water tube or the fuel supplying tube 3.;COPYRIGHT: (C)1996,JPO