METHOD AND APPATATUS OF BURNING PULVERIZED COAL

摘要

PURPOSE:To control the forming of NOx and the burning efficiency by merely selecting burning conditions by means of controlling the mixture ratio of secondary air and primary fuel and the distribution of fuel between first and secondary fuels by utilizing a fuel dividing burner. CONSTITUTION:A dividing apparatus 9 divides a mixture flow of pulverized coal and air into two, and respective ducts for carrying the mixture flow are connected to a pulverized coal burner 11 through which the divided mixture flows are discharged into a pulverized coal burning apparatus 12 to be burnt therein by the burner 11. Meanwhile, an air duct 2 bypasses an air duct 3 that is connected to the inlet side of a mill 1, and an air duct 4 is provided that is connected to a mixing device 10 disposed in one of the mixture flow carrying ducts which are divided into two on the discharge side of the dividing apparatus 9. The opening of valves 5 and 7 is regulated by input signals from a control device 13, which also determined the function of the dividing apparatus. In this manner, the forming of NOx and the burning efficiency out of coals of different fuel ratio and coals having different N contents can be controlled by simply setting their burning conditions.