LANCE FOR TOP-BLOWN REFINING

PURPOSE:To increase the secondary combustion rate in a converter and to add sufficiently a heat source in converter refining by boring tuyeres while regulating the diameter of the throat part of a lance tuyere and the number of tuyeres with a specified equation. CONSTITUTION:The tuyere 2 of a Laval...

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Bibliographic Details
Main Authors TSUJINO RYOJI, MUKAI TATSUO, HIRAI MASAZUMI
Format Patent
LanguageEnglish
Published 02.12.1986
Subjects
CHEMISTRY
METALLURGY
METALLURGY OF IRON
PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL
TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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Summary:PURPOSE:To increase the secondary combustion rate in a converter and to add sufficiently a heat source in converter refining by boring tuyeres while regulating the diameter of the throat part of a lance tuyere and the number of tuyeres with a specified equation. CONSTITUTION:The tuyere 2 of a Laval nozzle and its throat part 3, the tuyere 2' of a straight nozzle and its throat part 3', etc., are bored through a lance 1 to form a lance for top-blown refining. In the lance, the diameter dicm of the tuyere throat parts 3 and 3' and the number (n) of the tuyeres 2 and 2' are regulated by the equation so that the value (k) is controlled to 0.15-0.65. In the equation, (i) is the number of oxygen jets from each tuyere, Vk is 0.0475(x/di) -0.0138(x/di+14.78) +211.3, Vt is 0.0475(x/di) +0.785(x/di), (x) is the length of the free jet equal to (L-Hc)cm. L is the height in cm of the lance from the melt surface in refining, Hc is the length in cm of a supersonic core equal to (4.12P-1.86)Xdi, P is the oxygen pressure in kg/cm before the tuyere equal to 1.72X10<-2>XFO2i/A-1.033, FO2i is the amt. in Nm /h of oxygen to be fed at each tuyere and A is the cross-sectional area in cm of each tuyere.
Bibliography:Application Number: JP19850113835