公开(公告)号：CA2379591A1

公开(公告)日：2002-12-22

申请号：CA2379591

申请日：2002-03-28

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： SELINES RONALD JOSEPH ,  SARMA BALU ,  ANDERSON JOHN ERLING ,  MAHONEY WILLIAM JOHN

IPC: C21C5/30 ,  C21C5/32 ,  C21C5/46 ,  C21C5/52 ,  C21C7/04 ,  C21C7/068 ,  C21C7/072 ,  B22D11/117

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.

公开(公告)号：AU749671B2

公开(公告)日：2002-07-04

申请号：AU5842598

申请日：1998-03-16

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： ANDERSON JOHN ERLING ,  MATHUR PRAVIN CHANDRA ,  SELINES RONALD JOSEPH

IPC: B01J10/00 ,  B01F3/04 ,  B01F5/02 ,  C21C5/46 ,  C21C5/48 ,  C21C7/072 ,  F23D14/22 ,  F27D7/02 ,  F27D3/16

Abstract: A method for introducing gas into a liquid wherein a gas stream is ejected from a lance spaced above the liquid surface and directed from the lance onto the liquid surface. The gas retains substantially all its original jet axis velocity when it contacts the liquid surface, and substantially all of the gas penetrates the liquid surface and is introduced into the liquid. Preferably the gas stream is surrounded by a flame envelope running from the lance to the liquid surface, which shields the gas from ambient gas entrainment. The gas stream preferably forms a gas cavity within the liquid having a diameter substantially the same as the diameter of the gas stream as it is ejected from the lance.

公开(公告)号：TR9801697A2

公开(公告)日：2000-03-21

申请号：TR9801697

申请日：1998-08-28

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： ANDERSON JOHN ERLING ,  MATHUR PRAVIN CHANDRA ,  SELINES RONALD JOSEPH

IPC: C21D20060101 ,  C21D

Abstract: This is a method for injecting gas to liquids. In this method, a sprinkler placed over the surface of the liquid is used to sprinkle gas to the surface of the liquid. This gas, when touching the liquid surface conserves mainly the first sprinkle axis speed and a substantial part of the gas passes through the liquid surface and diffuses in the liquid. The gas flow is preferentially surrounded by a fire envelope and this fire envelope protects the said gas flow from the other gases in the fire envelope environment. The gas flow creates in the liquid a gas groove, the diameter of which is equal of the diameter of the gas at the moment it is thrown away from the sprinkler.

公开(公告)号：TR9801696A2

公开(公告)日：2000-03-21

申请号：TR9801696

申请日：1998-08-28

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： MATHUR PRAVIN CHANDRA ,  SELINES RONALD JOSEPH ,  ANDERSON JOHN ERLING

IPC: F23D20060101 ,  F23D

Abstract: Our invention is a method for efficiently giving the main gas to a melted metal pool, particularly useful for use in an electrical arc oven. In this method, the main gas is burned with a secondary oxygen fuel in order to create a fire cover that prevents the main gas to carry the gases in the environment when passing through the headroom of the oven. This allows the gas to keep most of its original power after its injection to the headroom. That way the gas can be injected in a secure distance from the surface of the melted metal and a complete infusion to the melted metal is ensured.

公开(公告)号：ID21710A

公开(公告)日：1999-07-15

申请号：ID981468

申请日：1998-11-09

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： ANDERSON JOHN ERLING ,  SELINES RONALD JOSEPH ,  MATHUR PRAVIN CHANDRA

IPC: C21C5/48 ,  C21C5/46 ,  C21C5/52 ,  C21C7/072 ,  F02M67/00

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.

公开(公告)号：ZA987971B

公开(公告)日：1999-05-26

申请号：ZA987971

申请日：1998-09-01

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： ANDERSON JOHN ERLING ,  MATHUR PRAVIN CHANDRA ,  SELINES RONALD JOSEPH

IPC: B01F20060101 ,  B01J20060101 ,  F27B20060101 ,  F27B ,  B01F ,  B01J

公开(公告)号：CA2254473A1

公开(公告)日：1999-05-20

申请号：CA2254473

申请日：1998-11-19

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： ANDERSON JOHN ERLING ,  MATHUR PRAVIN CHANDRA ,  SELINES RONALD JOSEPH

IPC: C21C5/48 ,  C21C5/46 ,  C21C5/52 ,  C21C7/072 ,  C21C5/32 ,  F27D3/14

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.

公开(公告)号：ZA9807865B

公开(公告)日：1999-03-02

申请号：ZA9807865

申请日：1998-08-28

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： MATHUR PRAVIN CHANDRA ,  SELINES RONALD JOSEPH ,  ANDERSON JOHN ERLING

IPC: C21C7/072 ,  C21C5/46 ,  C21C5/52 ,  F27B3/22 ,  F27D3/16 ,  F27B

CPC classification number: F27B3/225 ,  C21C5/4613 ,  C21C5/5217 ,  Y02P10/216

公开(公告)号：CA2232215A1

公开(公告)日：1998-09-18

申请号：CA2232215

申请日：1998-03-16

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： SELINES RONALD JOSEPH ,  MATHUR PRAVIN CHANDRA ,  ANDERSON JOHN ERLING

IPC: B01J10/00 ,  B01F3/04 ,  B01F5/02 ,  C21C5/46 ,  C21C5/48 ,  C21C7/072 ,  F23D14/22 ,  F27D7/02 ,  C21C5/32

Abstract: A method for introducing gas into a liquid wherein a gas stream is ejected from a lance spaced above the liquid surface and directed from the lance onto the liquid surface. The gas retains substantially all its original jet axis velocity when it contacts the liquid surface, and substantially all of the gas penetrates the liquid surface and is introduced into the liquid. Preferably the gas stream is surrounded by a flame envelope running from the lance to the liquid surface, which shields the gas from ambient gas entrainment. The gas stream preferably forms a gas cavity within the liquid having a diameter substantially the same as the diameter of the gas stream as it is ejected from the lance.

公开(公告)号：CA2154299A1

公开(公告)日：1996-01-22

申请号：CA2154299

申请日：1995-07-20

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： MATHUR PRAVIN CHANDRA ,  DU ZHIYOU ,  SELINES RONALD JOSEPH

IPC: C21C5/52 ,  F27B3/08 ,  F27B3/22 ,  F27D11/08 ,  F27D17/00

Abstract: A method for carrying out post combustion in an electric arc furnace comprising forming a preferential gas stream within the electric arc furnace, concentrating carbon monoxide within the gas stream, and providing post combustion oxygen into the gas stream where the carbon monoxide is concentrated.