| 摘要 |
PROBLEM TO BE SOLVED: To provide a boiler for reducing an unburned component of a fuel in a boiler furnace by improving a mixing performance of a combustion gas at a center of the furnace with two stage combustion air without strengthening power of a forced blower. SOLUTION: A pressure loss is reduced by increasing a channel sectional area of an air introducing unit of a two-stage combustion air supplying apparatus 3, and a permeating power of two stage combustion airs can be strengthened without strengthening power of a forced blower. Accordingly, mixing performance of the combustion gas at a center in a boiler furnace 1 with the two- stage combustion airs is improved, and a reduction in the unburned part of the fuel is performed. That is, as shown in the figure, a sectional area of a channel 51 of an inlet of the air or gas is increased more than that of an outlet of the air or gas, and a straight tube 90 is provided at the outlet of the air or gas in the combustion air or gas supplying apparatus.
|
