Combustion – Process of combustion or burner operation – Flame shaping – or distributing components in combustion zone
Reexamination Certificate
2000-02-02
2001-06-05
Lateef, Marvin M. (Department: 3743)
Combustion
Process of combustion or burner operation
Flame shaping, or distributing components in combustion zone
C431S181000, C431S187000, C431S158000, C239S424500
Reexamination Certificate
active
06241510
ABSTRACT:
TECHNICAL FIELD
This invention relates generally to gas dynamics and, more particularly, to coherent gas jet technology.
BACKGROUND ART
A recent significant advancement in the field of gas dynamics is the development of coherent jet technology which produces a laser-like jet of gas which can travel a long distance while still retaining substantially all of its initial velocity and with very little increase to its jet diameter. One very important commercial use of coherent jet technology is for the introduction of gas into liquid, such as molten metal, whereby the gas lance may be spaced a large distance from the surface of the liquid, enabling safer operation as well as more efficient operation because much more of the gas penetrates into the liquid than is possible with conventional practice where much of the gas deflects off the surface of the liquid and does not enter the liquid.
It is sometimes desirable to have both a coherent gas jet and a turbulent gas jet in an industrial operation. For example, in steelmaking it is sometimes desirable to use a coherent gas jet to inject gas into molten metal for stirring purposes while using one or more turbulent gas jets for combustion and/or decarburization purposes. A turbulent gas jet may be disruptive to another gas jet if they travel close to one another. With existing technology, industrial operations which desire using simultaneously both coherent and turbulent gas jets, require the use of two separate gas delivery systems which is expensive.
Accordingly, it is an object of this invention to provide a system which can effectively provide both a coherent gas jet and a turbulent gas jet proximate to one another into an injection volume.
SUMMARY OF THE INVENTION
The above and other objects, which will become apparent to those skilled in the art upon a reading of this disclosure, are attained by the present invention, one aspect of which is:
A method for providing proximate turbulent and coherent gas jets into an injection volume comprising:
(A) passing a gas jet into a forming volume, passing a flow of fuel into the forming volume annularly to the gas jet, and passing a flow of oxidant into the forming volume annularly to the gas jet;
(B) combusting the oxidant with the fuel to form a flame envelope around the gas jet;
(C) passing the gas jet and the flame envelope out from the forming volume into the injection space, said gas jet being a coherent gas jet; and
(D) passing at least one turbulent gas jet into the injection space proximate to the coherent gas jet wherein the flame envelope is between the coherent gas jet and the turbulent gas jet.
Another aspect of the invention is:
Apparatus for providing proximate turbulent and coherent gas jets into an injection volume comprising:
(A) a coherent gas jet provision means comprising a coherent gas nozzle having an output communicating with a forming volume, said forming volume communicating with the injection volume;
(B) means for providing fuel to the forming volume annular to the coherent gas nozzle;
(C) means for providing oxidant to the forming volume annular to the coherent gas nozzle; and
(D) a turbulent gas jet provision means proximate the coherent gas jet provision means, said turbulent gas jet provision means comprising a turbulent gas nozzle having an output communicating directly with the injection volume.
As used herein, the term “coherent jet” means a gas jet which is formed by ejecting gas from a nozzle and which has a velocity and momentum profile along its length which is similar to its velocity and momentum profile upon ejection from the nozzle.
As used herein, the term “annular” means in the form of a ring.
As used herein, the term “flame envelope” means an annular combusting stream substantially coaxial with at least one gas stream.
As used herein, the term “length” when referring to a coherent gas jet means the distance from the nozzle from which the gas is ejected to the intended impact point of the coherent gas jet or to where the gas jet ceases to be coherent.
As used herein, the term “turbulent jet” means a gas jet which is formed by ejecting gas from a nozzle and which has a velocity and momentum profile along its length which changes from its velocity and momentum profile upon ejection from the nozzle.
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Anderson John Erling
Mathur Pravin Chandra
Sarma Balu
Selines Ronald Joseph
Cocks Josiah C.
Ktorides Stanley
Lateef Marvin M.
Praxair Technology Inc.
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