| 摘要 |
PURPOSE:To uniform the thermal absorption in a furnace and make it possible to reliably control the combustion state of each of burners, by providing a flow rate controller which regulates the amount of air supplied to each burner corresponding to each mill. CONSTITUTION:Coal is fed to a mill 5 by a coal feeder 3 while being regulated in the flow rate. The coal ground in the mill 5 is supplied to a multiplicity of burner 7 through pulverized-coal pipes 6 and burnt therein. On the other hand, the air for combustion is divided into a primary air 11 and a secondary air 12. The secondary air 12 is heated by a heater 13 and then injected into the furnace from wind boxes 22 through ducts 20. On the other hand, the primary air 11 is heated by the heater 13 and supplied being boosted up by a primary air fan 10. Dampers 15, 18, 17, 21 are provided on air supply lines, respectively, thereby allowing an individual regulation of the flow rate of the primary and secondary air with respect to the burner group for each mill 5, in addition to an overall flow rate regulation. |
