| 摘要 |
1,133,923. Controlling furnace operation. H. ESCHER. 2 Jan., 1967 [6 Jan., 1966], No. 188/67. Heading F4B. In an open top shaft furnace having a gas offtake 9 and a charge hopper 29 spaced from an upper water cooled jacket 26, pressure in the space 30 so formed is measured by a differential pressure detector 31 and signalled to an actuator 32 to operate a valve 23 varying the draught in such a way as to keep said pressure constant. Offtake 9 leads the waste gases in turn through a combustion chamber 10 supplied with air through line 11, an air heating recuperator 12 or 13, a fan 24 and a dust collector 25. Fan 6 supplies air to recuperator 12 for the furnace tuyeres 2 and fan 17 supplies recuperator 14 either for use as a curtain of hot air through jets 22 over the hopper 29 or for discharge through line 21 to the stock 5. Valves 15 and 16 proportion the hot gas flow through regenerators 7 and 14. A temperature indicator 34 in combustion chamber 10 controls a valve 20 apportioning the flow to line 21 or jets 22. |
