method and smeltschachtoven for preparation of crude steel.

摘要

1,222,236. Charging blast furnaces. SUMITOMO KINZOKU KOGYO K.K. 15 May, 1968 [20 May, 1967; 20 Dec., 1967], No. 23179/68. Heading F4B. [Also in Division C7] Apparatus for charging a blast furnace comprises a large ball valve 9 and hopper 10, hoppers 7 feeding a shoot 11 and said hopper 10, a central hopper 1, shoot 4 and ball valve 3 and inner and outer partition walls 15 and 16 extending downwardly into the furnace shaft. Initially, coke is fed into outer annular space A from hoppers 7 and hopper 10 by raising said hopper 10 and thus allowing coke to fall over the outer partition wall 16. Then ore &c. is fed from hoppers 7 and hopper 10 into the central annular space B by opening ball valve 9. Finally, coke is fed to the central space C from hopper 1 and shoot 4 through ball valve 3. Offtakes 35 feed gases through an annular pipe 36 to a duct 37 and offtakes 22 feed top gas through annular pipe 23 to a duct 24. Gases from duct 37 are washed, filtered and compressed and fed to a beating-reformer (41, Fig. 2) where they are heated to 1000-1500‹ C., mixed with hydrocarbons which convert any C0 2 and H 2 0 to CO and H 2 , and are then blown into the furnace through tuyeres 45 via duct 43 and bustle pipe 44. Oxygen is supplied through duct 46 and blowpipe 47, a further quantity of hydrocarbon being supplied at 48. The O 2 reacts with the furnace coke and the additional hydrocarbons to produce further reducing gases which react with the ore. The coke can be wholly or partly replaced by coal, which carbonizes in situ. Top gas from duct 24 is also cleaned and used as combustion gas in the heating reformer.