OVERFIRING AIR PORT, OVER AIR PORT, AFTER AIR PORT METHOD FOR MANUFACTURING AIR PORT, BOILER, BOILER FACILITY, METHOD FOR OPERATING BOILER FACILITY AND METHOD FOR IMPROVING BOILER FACILITY

摘要

An over air port, an after air port, a boiler, a boiler facility, and operating method of the boiler facility, and an improving method of the boiler facility are provided to reduce the unburned matter and to reduce the density of the NOx and CO by injecting the combustion facilitating air from the after-air port. A boiler is composed of burners(101) placed at the wall of a furnace(113) to burn the fuel; and over-air-ports(100) placed at upper side than the burners and formed with an extension part at the outlet. The two-stage combustion is operated by supplying the over air from the over air ports. A seal medium supplying device is installed to seal the vicinity of the outlet of the over air port with gas or liquid. A seal port is installed at the seal medium supplying device and mounted to supply the seal medium from the extension part of the outlet of the over air port. A seal medium injection hole is installed at the seal port to supply the seal medium along with the wall surface of the extension part of the over air port.