| 摘要 |
PURPOSE:To reduce production of both NOX and CO, by a method wherein, in a boiler, the low temperature one of secondary airs is fed to a burner, a high temperature air is fed as 2-stage combustion air to a furnace. CONSTITUTION:Secondary air is fed to a burner B and an air port OAP for 2-stage combustion of a furnace 2 through a duct 4 for a burner and a duct 5 for an OAP with the aid of a forced blower 3. An element 1' for heat exchange in an air preheater 1 is rotated in a circumferential direction, and a heat transfer part heated by means of gas in an exhaust gas duct 6 is positioned facing the duct 5 for an OAP and the duct 4 for a burner in this order. Since the high temperature heat transfer part heats air in the duct 4 for a burner after it heats air in the duct 5 for an OAP, the lower temperature one of secondary air can be fed to a burner and the high temperature one can be fed as 2-stage combustion air to the furnace 2. |
