| 摘要 |
PURPOSE:To burn coal completely and reduce the heat loss by supplying coal which is merely crushed roughly, by a method wherein a boiler is provided with secondary air nozzles from which secondary air is blown, and soot and gas from a partial- combustion gasification furnace or a fluidized-bed partial-combustion gasification furnace are simultaneously burnt in the boiler. CONSTITUTION:Heavy oil is burnt by a start-up heavy oil burner installed on a partial- combustion gasification furnace 3, and then part of coal and heavy oil are burned in mixture. When part of coal begins to burn at a temperature of about 900 deg.C, the heavy oil burner is turned off. As air from nozzles 4 is supplied at a flow rate less than the total air flow rate required for complete combustion, part of coal burns in the partial-combustion gasification furnace 3 and the temperature is kept at around 900 deg.C, causing the remaining coal to be thermally cracked. The soot and gas generated from the partial-combustion gasification furnace 3 are blown into a combustion chamber 7 of a boiler 5 though a flue 12 and come into contact with secondary air supplied by a forced draft fan 16 through secondary air nozzles 6, so that gas burning takes place. The combustion gas after gas burning is discharged through a stack 15 after passing through a superheater 8 of the boiler 5, a boiler main body 9, an economizer 10, an air heater 11, a dust collector 13, and an induced draft fan 14. |
