| 摘要 |
PURPOSE:To regulate easily NOx and C to a suitable value and improve two- stage combustion efficiency by changing externally the direction of air blowing from each air hole in a multiple two-stage combustion air holes. CONSTITUTION:Two-state combustion air blowing is divided by nozzle 7 and 8 of air holes 4 and 5 and led to the upstream and downstream of the combustion gas produced by pulverized coal combustion with the burner 2 in a boiler combustion chamber 1. Furthermore, the nozzle 7 and 8 provided at the air holes 4 and 5 are rotated as needed by an external operational device, so that each of the directions of the two-stage combustion air blowing from the nozzles 7 and 8 can be freely changed. Therefore, even with single two-stage combustion air hole 3 the effect of double two-stage combustion is given and NOx can be regulated to a suitable value by the direction of the upper nozzle 7 and C to a suitable value by direction of the lower nozzle 8 with the conditions of operation such as the structure of the combustion chamber 1, the position of the two-stage combustion air hole 3, the amount of two-stage combustion air, and the amount of operation O3 fixed.
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