Metallurgical apparatus – Means for introducing fluent into vessel – e.g. – tuyere – Having means preventing damage to introducing means – e.g.,...
Patent
1988-02-15
1988-12-06
Rutledge, L. Dewayne
Metallurgical apparatus
Means for introducing fluent into vessel, e.g., tuyere
Having means preventing damage to introducing means, e.g.,...
266218, 266271, 266287, C21C 548
Patent
active
047891416
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns improvements in nozzles for injecting substances into liquids.
More particularly, the injection nozzle is employed for injecting gases, gases plus powders, or solids--usually accompanied by gases, into potentially dangerous liquids, e.g. molten metals such as iron and steel. The purposes of injecting such substances are numerous and diverse. U.S. Pat. No. 4,575,393 outlines some of the reasons for introducing substances into molten metals and in this connection reference is directed to that publication for further details.
Like U.S. Pat. No. 4,575,393, the present invention is for use in injecting substances through a wall of a melt containment vessel such as a ladle. The wall could be the bottom or more usually the side of the vessel. Apparatus embodying the invention for example comprises a refractory nozzle block, pierced by an injection passage, for installing in the vessel wall, and which--before injection--is closed at its discharge or liquid confronting end to prevent melt entering the passage. A delivery pipe forming part of a lance assembly is movable in the passage, and means is provided to advance the pipe forcibly to the said end to dislodge and/or break a blocking element which is temporarily located at or in this end to close the passage. The pipe is thus used to open the passage for admitting a substance into the melt via the delivery pipe in this particular apparatus.
Not uncommonly, a containment vessel such as a ladle is filled with molten metal a considerable time before the metallurgist is ready to inject a substance, or substances, into it. We have found that with some of the less viscous melts especially, the melt is able to enter the injection passage despite the presence of the nozzle blocking element. One such melt is molten iron. The melt may enter the passage apparently having leaked along a joint between the blocking element and the refractory block or even having percolated through the blocking element itself. The consequences of the melt thus by-passing the blocking element are serious. First, the discharge pipe is normally located close behind the blocking element before injection is to be initiated. If, as sometimes happens, the melt enters the pipe it can freeze therein, closing the pipe. Injection may then be, and normally will be, impossible. Thus, an entire ladle of melt of perhaps more than 200 tonnes, may have to be left untreated when the metal will not realise its full commercial value. Second, while the presence of frozen melt behind the blocking element may not always prevent injection, it could interfere with the movement of the delivery pipe such that it cannot be advanced as far as it should be upon initiating injection. Safety devices with which the apparatus is furnished may then be unable to fulfil their designed functions. Such devices may be intended to secure the lance assembly e.g. against inadvertent removal or ejection by the pressure of the melt, and to manipulate the lance assembly to shut off the injection of substance(s) into the melt.
An object of this invention is to provide a nozzle block with a passage blocking element capable of effectively preventing melt from bypassing said element and entering the injection passage.
Another object is to provide a satisfactory blocking element, which can readily be broken and dislodged from the nozzle block, to open the injection passage for injection to commence.
According to the present invention, there is provided an injection nozzle for installing in the wall of a liquid containment vessel for use when injecting substances into a liquid, comprising a body having at least one injection passage extending towards a discharge end of the body and having a passage closing means imbedded therein, the passage closing means comprising a hollow shell closed at one end and resistant to percolation of the liquid therethrough, a sidewall and an end closing portion of the shell being united by a shell portion of reduced strength permitting a force applied to the closing portion to detach
REFERENCES:
patent: 3495815 (1970-02-01), Holmes
patent: 4266970 (1981-05-01), Iwaoka et al.
patent: 4298192 (1981-11-01), Barbakadze et al.
patent: 4423858 (1984-01-01), Ostlund
patent: 4494735 (1985-01-01), Hershey
patent: 4575393 (1986-03-01), Bates et al.
patent: 4742995 (1988-05-01), Bates
Bates Kenneth W.
Cudby Joseph W.
Dixon Peter R.
Ingersoll Buchanan
Injectall Limited
McDowell Robert L.
Ring Alvin E.
Rutledge L. Dewayne
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