| 摘要 |
1,258,737. Cooling materials discharged from furnaces. L. H. NIEMS. 23 June, 1970 [23 June, 1969], No. 30491/70. Heading F4B. Granular material discharged from a rotary kiln 10, e.g. lime, cement clinker, dolomite or expanded shale, enters a shaft cooler 12 through a grating 14, said shaft cooler comprising a fan 31 with inlet duct 33 and outlet duct 32 with plenum chamber 30 supplying cooling air through gaps 38 in superposed hopper section 18 and 19 and via ducts 43 through tuyeres 39, some of the air being drawn downwardly into a hood 23 surrounding discharge shoots 20 by a duct 34 connecting said hood 23 to said inlet duct 33. There are four hoppers 18, 19 discharging through the shoots 20 and co-operating shoots 21 in said hood 23 on to vibratory feeders discharging on to a conveyer belt 25. The inlet duct 33 is closed by a plate 42 with a metering orifice 41 and valves 35 and 36 are provided in the ducts 34 and 32. Most of the air escaping upwardly in shaft 12 is used as combustion air, the remainder passing by exhaust duct 50 to a coal pulverizing mill and air recirculated through duct 34 carries dust away from the discharge shoots. |
