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公开(公告)号：JP2001248803A
公开(公告)日：2001-09-14
申请号：JP2001025298
申请日：2001-02-01
Applicant: PRAXAIR TECHNOLOGY INC
Inventor： ANDERSON JOHN ERLING , SARMA BALU , SELINES RONALD JOSEPH , MATHUR PRAVIN CHANDRA
Abstract: PROBLEM TO BE SOLVED: To provide a system which can effectively supply both a coherent gas jet and a turbulent gas jet, both of which are proximate to each other, into an injection volume. SOLUTION: This system which supplies a gas into the injection volume in the form of one or a plurality of coherent gas jets which are close to one or a plurality of turbulent gas jets forms the coherent gas jets in a mold by using a frame envelope before the coherent gas jets are passed to the injection volume to which the turbulent gas jets are directly passed.
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公开(公告)号：JPH10263384A
公开(公告)日：1998-10-06
申请号：JP8242998
申请日：1998-03-16
Applicant: PRAXAIR TECHNOLOGY INC
Inventor： ANDERSON JOHN ERLING , MATHUR PRAVIN CHANDRA , SELINES RONALD JOSEPH
Abstract: PROBLEM TO BE SOLVED: To make it possible to effectively introduce gases into a liquid pool while averting the drastic damage to a gas injector induced by the contact of molten metal, etc., with the liquid pool by forming a flame enclosure formed by burning fuel and oxidant to the circumference of the main gaseous flow emerging from a central main orifice. SOLUTION: A lance 1 is constituted by concentrically providing the lance with a central conduit 2 and first and second annular passages 3, 4. The main orifice terminating at the injection end 5 of the lance 1 is formed at the central conduit 2. Orifices 7, 8 terminating at the injection end 5 are formed in the respective annular passages 3, 4 as well and are formed as a hole group arrayed to constitute a circle encircling the main orifice. A main gaseous source is passed to the central conduit 2 and a fuel source is passed to the first annular passage 3 and an oxygen source to the second annular passage 4, respectively. The flame enclosure 33 formed by mixing and burning the fuel and oxidant is formed around the main gaseous flow 30 emerging from the main orifice, by which the introduction of the gases into the liquid, such as molten metal, is made possible.
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公开(公告)号：JPH11217620A
公开(公告)日：1999-08-10
申请号：JP32925298
申请日：1998-11-19
Applicant: PRAXAIR TECHNOLOGY INC
Inventor： ANDERSON JOHN ERLING , MATHUR PRAVIN CHANDRA , SELINES RONALD JOSEPH
Abstract: PROBLEM TO BE SOLVED: To provide a jet injector lance in which a gas jetting flow is sufficiently penetrated and poured below the liquid level of molten metal regardless of the case that the tip part of a pouring device can be positioned to a considerably far position from the liquid level. SOLUTION: The injector nozzle is composed of (A) a injector assembly 3 provided with (1) a nozzle having a primary passage 2, a pouring space 6, an inlet 4 communicated with the primary passage and an outlet 5 communicated with the pouring space, (2) a first secondary passage 7 apart from the primary passage in the radial direction and communicated with the injection space and (3) a second secondary passage 8 apart from the first secondary passage in the radial direction and communicated with the injection space and (B) a jacket 9 demarcating the injection space by extending and passing through the outlet position of the nozzle and covering the injector assembly.
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公开(公告)号：JPH10259413A
公开(公告)日：1998-09-29
申请号：JP8242798
申请日：1998-03-16
Applicant: PRAXAIR TECHNOLOGY INC
Inventor： MATHUR PRAVIN CHANDRA , SELINES RONALD JOSEPH , ANDERSON JOHN ERLING
Abstract: PROBLEM TO BE SOLVED: To provide a method for effectively supplying main gas into a molten metal pool part, particularly useful to use in an electric arc furnace. SOLUTION: In this method, the combustion of fuel with secondary oxygen is used to form the glame envelope around the flow of the main gas for protecting from being accompanied with the surrounding gas at the time of passing through the head space of the furnace. This method can hold the original power to the plactical degree at the time of pouring the gas into the head space and thus, the gas can be flowed into the further in the safe distance from the molten metal surface, and further, substantially full invasion onto the molten metal can be achieved.
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公开(公告)号：CA2379591C
公开(公告)日：2006-12-05
申请号：CA2379591
申请日：2002-03-28
Applicant: PRAXAIR TECHNOLOGY INC
Inventor： ANDERSON JOHN ERLING , MAHONEY WILLIAM JOHN , SELINES RONALD JOSEPH , SARMA BALU
Abstract: A metal refining method particularly useful with a basic oxygen steelmaking process, wherein during an initial period, refining oxygen is provided into the furnace headspace surrounded by a shroud comprising oxygen and inert gas, and during a subsequent period refining oxygen is provided into the furnace headspace surrounded by a frame shroud.
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Patent Agency Ranking
公开(公告)号：AT281534T
公开(公告)日：2004-11-15
申请号：AT02007437
申请日：2002-03-29
Applicant: PRAXAIR TECHNOLOGY INC
Inventor： SARMA BALU , SELINES RONALD JOSEPH , ANDERSON JOHN ERLING , MAHONEY WILLIAM JOHN
Abstract: A metal refining method particularly useful with a basic oxygen steelmaking process, wherein during an initial period, refining oxygen is provided into the furnace headspace surrounded by a shroud comprising oxygen and inert gas, and during a subsequent period refining oxygen is provided into the furnace headspace surrounded by a flame shroud.
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公开(公告)号：AU771004B2
公开(公告)日：2004-03-11
申请号：AU1677401
申请日：2001-02-01
Applicant: PRAXAIR TECHNOLOGY INC
Inventor： ANDERSON JOHN ERLING , SARMA BALU , SELINES RONALD JOSEPH , MATHUR PRAVIN CHANDRA
Abstract: A system for providing gases (1) into an injection volume in one or more coherent gas jets (30) proximate to one or more turbulent gas jets (32) wherein a coherent gas jet is formed in a forming volume (5) with a flame envelope (31) prior to passage into the injection volume into which the turbulent gas jets are directly passed.
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公开(公告)号：PT918093E
公开(公告)日：2003-06-30
申请号：PT98121992
申请日：1998-11-19
Applicant: PRAXAIR TECHNOLOGY INC
Inventor： ANDERSON JOHN ERLING , SELINES RONALD JOSEPH , MATHUR PRAVIN CHANDRA
Abstract: A lance which may be used to establish a long coherent gas jet which includes a primary passageway having a converging/diverging nozzle, and two radially spaced secondary passageways for establishing a flame barrier, each of the passageways communicating with an injection space defined by a protective jacket. Additional to these main passageways the jacket may comprise one or two other passages for the supply of fluid or solid streams.
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公开(公告)号：DE69812544D1
公开(公告)日：2003-04-30
申请号：DE69812544
申请日：1998-11-19
Applicant: PRAXAIR TECHNOLOGY INC
Inventor： ANDERSON JOHN ERLING , MATHUR PRAVIN CHANDRA , SELINES RONALD JOSEPH
Abstract: A lance which may be used to establish a long coherent gas jet which includes a primary passageway having a converging/diverging nozzle, and two radially spaced secondary passageways for establishing a flame barrier, each of the passageways communicating with an injection space defined by a protective jacket. Additional to these main passageways the jacket may comprise one or two other passages for the supply of fluid or solid streams.
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公开(公告)号：CA2254473C
公开(公告)日：2003-04-15
申请号：CA2254473
申请日：1998-11-19
Applicant: PRAXAIR TECHNOLOGY INC
Inventor： SELINES RONALD JOSEPH , ANDERSON JOHN ERLING , MATHUR PRAVIN CHANDRA
Abstract: A lance which may be used to establish a long coherent gas jet which includes a primary passageway having a converging/diverging nozzle, and two radially spaced secondary passageways for establishing a flame barrier, each of the passageways communicating with an injection space defined by a protective jacket.
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