Multistage steam generator furnace - has surfaces in heat exchange zones cooling gases from successive reaction zones

摘要

The steam generator furnace has a first reaction zone (1), following a pre-mixing burner, with inlets for air and/or flue gas contg oxygen (2), and for fuel (3). Surfaces (5) in a first heat exchange zone (4) cool the combustion gases generated in the first reaction zone from 1300-1600 deg.C to 700-1000 deg.C. deg.C. A second reaction zone (6) contains nozzles spraying fuel in a finely divided state (7). Surfaces (9) in a second heat exchange zone (8) cool the combustion gases from the second reaction zone from 1200-1600 deg.C. to outlet temp. ADVANTAGE - Improved combustion with low NOX generation