| 摘要 |
PURPOSE:To recover the heat of high temperature ash and to simplify the equipment for treating the high temperature ash, in a gas recirculating system, by directly introducing the high temperature coal ash, which is captured by a gas- recirculation dust collecting device, to the inlet flue of an air preheater. CONSTITUTION:Part of burned exhaust gas from a coal burning boiler is extracted from a gas recirculating fan 20 through the outlet of a coal saving device 2 and a gas-recirculation dust collecting device 18 and circulated to a boiler burning chamber 1. Ash, which is stored in a coal saving hopper 6, a denitration device hopper 22, an air preheater hopper 7 and a dust collecting device hopper 8 in the coal burning boiler, is supplied into an conveying pipe 11, which is connected to a vacuum source or a pressurizing source, from an ash supplying valves 10 provided at the lower parts of the hoppers. The ash is conveyed to a fly ash silo 12 by air. Meanwhile, the high temperature coal ash, which is captured by the gas-recirculation dust collecting device 18, is put in an ash conveying pipe 11a through an ash supplying valve 10a and a feeder tank 28. The ash is introduced into an inlet flue 31 of an air preheater 3 directly from a pressure blower 27. |
