| 摘要 |
PURPOSE:To provide a low NOX pulverized coal burner which can correspond to the change in the kind of coal, by a method wherein secondary air is divided into axially-flowing air and spirally-flowing air, a swirl nozzle is movable, and the swirl strength and the swirl radius of the secondary air are independently regulated into the optimum. CONSTITUTION:An axial flow nozzle 13 is an annular nozzle disposed concentrically with a fuel nozzle 11, and the axially-flowing air AA fed through the axial flow nozzle 13 is injected to form a rectilinear flow. Swirl flow nozzles 14 consists of 8 L-tubes, and the air CA fed through the swirl flow nozzles 14 is jetted to form a swirl flow. The swirl flow nozzle 14 is set so that an octagon, provided resulting from drawing of a semistraight line in the direction of a nozzle outlet by means of a nozzle moving device 15, forms an imaginary circle. As a result, if a ratio of the radius of the imaginary circle of the swirl flow nozzle 14 to the straight-advancing component of the secondary air is set to an optimum value, NOX produced during combustion of pulverized coal is brought to a minimum value irrespective of the kind of coal.
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