| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the temperature of an already combusted gas, and at the same time, effectively reduce the flame temperature by increasing the circulation amount of the already combusted gas, and reduce the amount of NOx for a burner. SOLUTION: A plurality of air outlets 13 having a circular cross section are arranged in a circle, and on the inside a plurality of fuel outlets 16 are arranged on the circumferential locations which are alternate with the air outlets 13. At the central part, a combustion air outlet 11 is provided. At the tip of this burner, a guide vane 8 which circulates an already combusted gas in a manner to be a stream 14 to the burner tip part, is arranged. The already combusted gas which circulates along a furnace wall 3, and of which the temperature has decreased, flows in the guide vane 8 in parallel with a combustion air 16, and is further cooled, and thus, a flame temperature is reduced, and the generation of NOx is suppressed.</p> |
