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    • 6. 发明专利
    • OPERATING METHOD OF PRELIMINARY REDUCTION FURNACE WITH FLUIDIZED BED
    • JPS5980706A
    • 1984-05-10
    • JP19211682
    • 1982-11-01
    • KAWASAKI STEEL CO
    • HAMADA HISAOINATANI TOSHIHIROKATAYAMA EIJITSUCHITANI NOBUOTAKADA SHIKOUKADOTO MITSUOFUJITA TSUTOMUHAMADA SHIYUNJI
    • C21B13/00
    • PURPOSE:To perform an operation which is stable for a long period of time without decreasing reduction rate in the stage of reducing preliminarily powder and granular ore with the high temp. waste gas generated from a melt reduction furnace as reducing gas by using gaseous hydrocarbon of a low temp. together as fluidizing gas and a reducing agent. CONSTITUTION:A part of gas contg. hydrocarbon such as CH3, C3H8 or the like is introduced 13, 13' respectively into a conduit 12 for the above-described high temp. reducing gas or near a supply port 8 for the reducing gas in a preliminary reduction furnace 1. On the other hand, a position of the gas contg. hydro-carbons corresponding to the amt. to remain after subtracting the amt. necessary for the preliminery reduction of Cr2O3 from total gas is supplied directly 9 to the fluidized bed 2 region of the furnace 1, and the operation of the furnace 1 is performed. The temp. of the reducing gas of a high temp. can be decreased effectively by increasing the flow rate of the gas contg. hydrocarbon to be supplied 12. However, in the case of reducing preliminarily hardly reducing Cr2O3, the rate of partial thermal crackng of hydrocarbon increases and there is possibilitythat the amt. effective for reducing Cr2O3 decreases. Therefore, it is possible to compensate some part (corresponding to the remaining part) with the amt. of the gas contg. hydrocarbon to be supplied directly into the bed 2.
    • 9. 发明专利
    • LEAKAGE DETECTING DEVICE OF BLAST FURNACE TUYERE COOLING WATER
    • JPS556445A
    • 1980-01-17
    • JP7771478
    • 1978-06-27
    • KAWASAKI STEEL CO
    • KATAGIRI HIDEAKIIWAMURA TADAAKIAKIMOTO EIJIHAMADA SHIYUNJIMARUSHIMA HIROYATAKAHASHI HIROYASU
    • C21B7/24C21B7/10
    • PURPOSE:To improve the detection accuracy of leakage of cooling water by providing a feed water flow rate detecting header and a discharge water detecting header as well as a pair of flowmeters to the apparatus and measuring the differential flow rates between multiple tuyeres and feed and discharge water pipelines corresponding to these tuyeres. CONSTITUTION:At the measuring of a tuypere 8, the water supply side 3-way automatic ball valve 4 and discharge water side 3-way automatic ball valve 5 are changed over to change the cooling water channel to the B direction by a sequence unit 11. The cooling water flows from the feed water side of a flowmeter 7 to a feed water flow rate detecting head 2, from where it flows in the B direction of the ball valve 4 and enters the tuyere 8. This waste cooling water flows through the ball valve 5 in the B direction, enters a waste water flow rate detecting header 3 and enters a tuyere discharge water trough 9 from the discharge water side of the flowmeter 7. This operation is performed in the order of the tuyeres 8, 8', 8''. A calibration channel wherein the cooling water flows from the flowmeter 7 into the feed water flow rate detecting header 2 and passes through the flow rate calibrating valve 6 then through the discharge water flow rate detecting header 3, flowmeter 7 is created for measurement of this feed and waste water flows. The differences of the feed and waste water flows are obtained and are used as the instrument correcting values at the measurement channel.