| 摘要 |
PURPOSE:To enable reduction in production of NOX and also to improve the combustion efficiency, by a method wherein pulverized coal is collected to a central part to collectively burn it under a low air ratio condition. CONSTITUTION:A three-dimentional air injection nozzle 22 is positioned at the outer periphery part of a burner, and a tertiary air, flowing in through a resistor 21, is injected in a furnace to form a swirl flow with the aid of a swirl vane 23, whereby pulverized coal forms a combustion flame as it is partially swirled through the swirl force of the tertiary air. As a result, the central part of the furnace becomes short of the air. In the combustion range under a low air ratio condition of the central part A, volatile nitrogen compound such as NH3 is produced, combustion in the vicinity of a wall is conducted under a high air ratio condition to produced NOX. The swirl flow of the tertiary air promotes mixture on the slipstream side of the two flames, and causes NOX to be reduced into N2. This enables decrease of an amount of NOX exhausted from the furnace. |
