Bed boiler fuel detonation suppressant system that damps down is vulcanized in circulation

The utility model discloses a bed boiler fuel detonation suppressant system that damps down is vulcanized in circulation, vulcanize the bed boiler including the circulation, the circulation is vulcanized the bed boiler and is included furnace, the air intake on furnace upper portion has connected gradually cyclone, the over heater, a coal economizer, air heater and draught fan, the feed inlet of furnace lower part is connected with the feeder, the returning charge mouth of furnace lower part is connected with the returning charge ware, the bottom of returning charge ware links to each other with the overfire air fan, the top of returning charge ware links to each other with cyclone's bottom, furnace's bottom is provided with the plenum, the hood hole has been arranged on the air distribution plate of plenum, the air intake of plenum side links to each other with air heater's air outlet, the bottom of plenum is provided with two at least ventilation pipes that communicate with the plenum, be provided with the blow valve on each ventilation pipe respectively, after the circulating fluidized bed boiler damps down, in time open the blow valve, make combustible gas in the plenum plenum of in time discharging, avoid combustible gas to gather in the plenum, the security performance of boiler equipment has been improved.