PULVERIZED COAL/HEAVY OIL COMBUSTION BURNER FOR LOW NOX

摘要

PURPOSE:To prevent the generation of fuel NOx and thermal NOx due to a powerful reducing process of CO, H2 and the like by feeding pulverized coal in a double injection sandwiching a recirculating gas internally and externally while injecting water from the center. CONSTITUTION:Outer one 4 of air flows 7 and 4 of pulverized coal injected inside and outside a recirculating gas 11 is ignited to burn in contact with secondary air 19 from the circumference section thereof while receiving a radiated heat from a burner tile and combustion flame. The combustion is shifted to char in the early period thereof after volatile componenets are released out. On the other hand, the combustion starts as the pulverized coal 7 surrouded by the recirculating gas releases volatile componenets by a heat of outer flame in the shortage of air. At the same time, atomized water from a 3-fluid oil burner 24 at the center and carbon of hydrocarbon during the combustion cause a water gas reaction. Generated oxcides of N are reduced by CO and H2.