US20070175297A1 - Launder burner - Google Patents

Launder burner Download PDF

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Publication number
US20070175297A1
US20070175297A1 US11/342,907 US34290706A US2007175297A1 US 20070175297 A1 US20070175297 A1 US 20070175297A1 US 34290706 A US34290706 A US 34290706A US 2007175297 A1 US2007175297 A1 US 2007175297A1
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US
United States
Prior art keywords
burner
launder
furnace
tap hole
molten metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/342,907
Inventor
John Hugens
Thomas Robertson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US11/342,907 priority Critical patent/US20070175297A1/en
Publication of US20070175297A1 publication Critical patent/US20070175297A1/en
Abandoned legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/14—Discharging devices, e.g. for slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/12—Opening or sealing the tap holes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/24—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a vertical, substantially cylindrical, combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/16—Arrangements of tuyeres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/21—Arrangements of devices for discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/04—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces
    • F27B3/045—Multiple chambers, e.g. one of which is used for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/14—Charging or discharging liquid or molten material
    • F27D3/145—Runners therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2202/00—Combustion
    • F23G2202/20—Combustion to temperatures melting waste

Definitions

  • This technology relates to a launder for conveying a stream of molten metal.
  • a vertical shaft melting furnace is a particular type of furnace that is used to melt metal. Pieces of metal are dropped into the furnace shaft to form a load of pieces that are piled upward from the bottom of the shaft. Burners fire into the shaft to melt the load of metal pieces, and the molten metal drains outward through a tap hole at the bottom of the shaft.
  • a launder is a trough-shaped structure that extends from the tap hole to convey the stream of molten metal from the furnace to a holding vessel.
  • the claimed invention includes a burner that is arranged to fire in a direction extending upstream through a launder toward and into a vertical shaft melting furnace through the tap hole in the furnace.
  • the burner can preheat both the furnace and the launder.
  • the invention further provides a method of pretreating a vertical shaft melting furnace by firing a burner in a direction extending upstream through the launder toward and into the shaft through the tap hole.
  • the invention provides a method of retrofitting a vertical shaft melting furnace by installing the burner on the launder. It follows that the invention includes a retrofitted apparatus as well as an originally constructed apparatus with such a burner.
  • FIG. 1 is a schematic view, taken from the side and shown partly in section, of a vertical shaft melting furnace and a launder equipped with a burner.
  • FIG. 2 is a sectional view taken generally on line 2 - 2 of FIG. 1 .
  • the parts that are shown schematically in FIGS. 1 and 2 include a vertical shaft melting furnace 10 and a launder 12 .
  • the furnace 10 has a charge entrance 14 and a tap hole 16 .
  • a shaft 18 extends vertically downward through the furnace 10 from the charge entrance 14 to the tap hole 16 .
  • a hearth 20 at the bottom of the shaft 18 is inclined toward the tap hole 16 .
  • the furnace 10 further has a flue (not shown) at the upper end of the shaft 18 , and has horizontal rows of burners 24 that fire into the shaft 18 between the charge entrance 14 and the hearth 20 .
  • metal pieces are dropped into the shaft 18 through the charge entrance 14 and are piled upward from the hearth 20 to form an irregularly shaped load with a height that reaches past the burners 24 .
  • Molten metal drops to the hearth 20 and flows outward through the tap hole 16 as the pile of metal pieces is melted downward through the shaft 18 .
  • the molten metal then flows through the launder 12 from the furnace 10 to a ladle (not shown) or other holding vessel.
  • the launder 12 includes a trough 30 with a bottom wall 32 and a pair of opposite side walls 34 .
  • the launder 12 further has cover portions 36 that can be installed and removed separately from each other along the length of the trough 30 .
  • Burners (not shown) can be mounted on the covers 36 to maintain the launder 12 at or above the melting temperature of the metal load. Such burners may have any suitable structure and arrangement known to those of ordinary skill in the art.
  • the launder 12 is equipped with a burner 40 that is arranged to fire in a direction extending upstream through the launder 12 toward and into the furnace 10 through the tap hole 16 .
  • the burner 40 at the launder 12 preferably is a high velocity burner with a central nozzle axis 45 along which a flame is projected from the burner 40 .
  • suitable burners include premix burners and nozzle mix burners.
  • the burner 40 is a nozzle mix burner that is mounted on a side wall 34 of the trough 30 in a position above the level at which a stream of molten metal is expected to flow through the launder 12 , with the central nozzle axis 45 extending into the shaft 18 through the center of the tap hole 16 .
  • the launder has a first section 50 extending in a straight line from the tap hole 16 , and has a second section 52 extending at an angle from the first section 50 .
  • the second section 52 of the launder 12 is oriented to provide a location from which the burner axis 45 can project through the first section 50 of the launder 12 and further through the tap hole 16 so that the burner 40 can preheat both the first section 50 of the launder 12 and the shaft 18 inside the furnace. This is preferably accomplished by firing the burner 40 in a fuel-rich condition to avoid excess oxidant in the shaft 18 which, in turn, avoids oxidation of copper in the load to be melted in the shaft 18 .

Abstract

A launder is configured to convey a stream of molten metal from a tap hole in a vertical shaft melting furnace. A burner is arranged to fire in a direction extending upstream through the launder toward and into the furnace through the tap hole. In this arrangement, the burner can preheat both the furnace and the launder.

Description

    TECHNICAL FIELD
  • This technology relates to a launder for conveying a stream of molten metal.
    • BACKGROUND
  • A vertical shaft melting furnace is a particular type of furnace that is used to melt metal. Pieces of metal are dropped into the furnace shaft to form a load of pieces that are piled upward from the bottom of the shaft. Burners fire into the shaft to melt the load of metal pieces, and the molten metal drains outward through a tap hole at the bottom of the shaft. A launder is a trough-shaped structure that extends from the tap hole to convey the stream of molten metal from the furnace to a holding vessel.
    • SUMMARY
  • The claimed invention includes a burner that is arranged to fire in a direction extending upstream through a launder toward and into a vertical shaft melting furnace through the tap hole in the furnace. In this arrangement, the burner can preheat both the furnace and the launder.
  • The invention further provides a method of pretreating a vertical shaft melting furnace by firing a burner in a direction extending upstream through the launder toward and into the shaft through the tap hole.
  • Additionally, the invention provides a method of retrofitting a vertical shaft melting furnace by installing the burner on the launder. It follows that the invention includes a retrofitted apparatus as well as an originally constructed apparatus with such a burner.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic view, taken from the side and shown partly in section, of a vertical shaft melting furnace and a launder equipped with a burner.
  • FIG. 2 is a sectional view taken generally on line 2-2 of FIG. 1.
    • DETAILED DESCRIPTION
  • The apparatus shown schematically in the drawings has parts that are examples of the elements recited in the apparatus claims, and can be operated in steps that are examples of the elements recited in the method claims. The following description thus includes examples of how a person of ordinary skill in the art can make and use the claimed invention. It is presented here to meet the requirements of enablement and best mode without imposing limitations that are not recited in the claims. The various parts as shown, described, and claimed, may be of either original or retrofitted construction as required to accomplish any particular implementation of the claimed invention.
  • The parts that are shown schematically in FIGS. 1 and 2 include a vertical shaft melting furnace 10 and a launder 12. The furnace 10 has a charge entrance 14 and a tap hole 16. A shaft 18 extends vertically downward through the furnace 10 from the charge entrance 14 to the tap hole 16. A hearth 20 at the bottom of the shaft 18 is inclined toward the tap hole 16. The furnace 10 further has a flue (not shown) at the upper end of the shaft 18, and has horizontal rows of burners 24 that fire into the shaft 18 between the charge entrance 14 and the hearth 20.
  • In use of the furnace 10, metal pieces are dropped into the shaft 18 through the charge entrance 14 and are piled upward from the hearth 20 to form an irregularly shaped load with a height that reaches past the burners 24. Molten metal drops to the hearth 20 and flows outward through the tap hole 16 as the pile of metal pieces is melted downward through the shaft 18. The molten metal then flows through the launder 12 from the furnace 10 to a ladle (not shown) or other holding vessel.
  • The launder 12 includes a trough 30 with a bottom wall 32 and a pair of opposite side walls 34. The launder 12 further has cover portions 36 that can be installed and removed separately from each other along the length of the trough 30. Burners (not shown) can be mounted on the covers 36 to maintain the launder 12 at or above the melting temperature of the metal load. Such burners may have any suitable structure and arrangement known to those of ordinary skill in the art. Additionally, the launder 12 is equipped with a burner 40 that is arranged to fire in a direction extending upstream through the launder 12 toward and into the furnace 10 through the tap hole 16.
  • The burner 40 at the launder 12 preferably is a high velocity burner with a central nozzle axis 45 along which a flame is projected from the burner 40. Examples of suitable burners include premix burners and nozzle mix burners. In the illustrated example, the burner 40 is a nozzle mix burner that is mounted on a side wall 34 of the trough 30 in a position above the level at which a stream of molten metal is expected to flow through the launder 12, with the central nozzle axis 45 extending into the shaft 18 through the center of the tap hole 16. More specifically, the launder has a first section 50 extending in a straight line from the tap hole 16, and has a second section 52 extending at an angle from the first section 50. The second section 52 of the launder 12 is oriented to provide a location from which the burner axis 45 can project through the first section 50 of the launder 12 and further through the tap hole 16 so that the burner 40 can preheat both the first section 50 of the launder 12 and the shaft 18 inside the furnace. This is preferably accomplished by firing the burner 40 in a fuel-rich condition to avoid excess oxidant in the shaft 18 which, in turn, avoids oxidation of copper in the load to be melted in the shaft 18.
  • This written description sets forth the best mode of carrying out the invention, and describes the invention to enable a person of ordinary skill in the art to make and use the invention, by presenting examples of the elements recited in the claims. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples, which may be available either before or after the application filing date, are intended to be within the scope of the claims if they have structural or process elements that do not differ from the literal language of the claims, or if they have equivalent structural or process elements with insubstantial differences from the literal language of the claims.

Claims (11)

1. An apparatus comprising:
a launder configured to convey a stream of molten metal from a tap hole in a vertical shaft melting furnace; and
a burner arranged to fire in a direction extending upstream through the launder toward and into the furnace through the tap hole, whereby the burner can preheat both the furnace and the launder.
2. An apparatus as defined in claim 1 wherein the burner is a nozzle mix burner.
3. An apparatus as defined in claim 1 wherein the burner is a premix burner.
4. An apparatus as defined in claim 1 wherein the burner is mounted on a side wall of the launder.
5. An apparatus as defined in claim 1 wherein the launder has a first section extending in a straight line from the tap hole, and has a second section extending at an angle from the first section, and the burner is mounted on the second section of the launder.
6. A method of preheating a vertical shaft melting furnace with a launder configured to convey a stream of molten metal from a tap hole in the furnace, comprising:
preheating both the furnace and the launder by firing a burner in a direction extending upstream through the launder toward and into the furnace through the tap hole.
7. A method as defined in claim 6 wherein the burner is fired in a fuel rich condition.
8. A method of retrofitting a launder configured to convey a stream of molten metal from a tap hole in a vertical shaft melting furnace, comprising:
installing a burner arranged to fire in a direction extending upstream through the launder toward and into the furnace through the tap hole, whereby the burner can preheat both the furnace and the launder.
9. A method as defined in claim 8 wherein the burner is a nozzle mix burner.
10. An apparatus as defined in claim 8 wherein the burner is a premix burner.
11. A method as defined in claim 8 wherein the launder has a side wall and the burner is mounted on the side wall.
US11/342,907 2006-01-30 2006-01-30 Launder burner Abandoned US20070175297A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/342,907 US20070175297A1 (en) 2006-01-30 2006-01-30 Launder burner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/342,907 US20070175297A1 (en) 2006-01-30 2006-01-30 Launder burner

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US20070175297A1 true US20070175297A1 (en) 2007-08-02

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2265284A (en) * 1940-10-26 1941-12-09 Internat Smelting & Refining C Melting copper
US2298055A (en) * 1941-04-05 1942-10-06 Int Smelting & Refining Co Melting copper
US2339337A (en) * 1942-03-14 1944-01-18 Int Smelting & Refining Co Furnace launder construction
US2784078A (en) * 1955-08-24 1957-03-05 William E Greenawalt Process of smelting finely divided metallic ore
US3366465A (en) * 1962-06-22 1968-01-30 American Smelting Refining Cast copper wire bar
US4301997A (en) * 1978-06-30 1981-11-24 Southwire Company Continuous copper melting furnace
US4315775A (en) * 1979-11-28 1982-02-16 Southwire Company Continuous melting and refining of secondary and/or blister copper
US4402492A (en) * 1982-06-16 1983-09-06 United States Steel Corporation Burner apparatus for molten metal fume suppression
US4536152A (en) * 1983-04-04 1985-08-20 Asarco Incorporated High-velocity gas burners
US4795490A (en) * 1987-12-22 1989-01-03 Essex Group, Inc. Inert gas purging during shaft furnace shut down
US4844426A (en) * 1985-02-04 1989-07-04 Southwire Company Vertical shaft furnace for melting aluminum
US5744093A (en) * 1996-07-04 1998-04-28 Desom Enviromental Systems Limited Cover for launders

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2265284A (en) * 1940-10-26 1941-12-09 Internat Smelting & Refining C Melting copper
US2298055A (en) * 1941-04-05 1942-10-06 Int Smelting & Refining Co Melting copper
US2339337A (en) * 1942-03-14 1944-01-18 Int Smelting & Refining Co Furnace launder construction
US2784078A (en) * 1955-08-24 1957-03-05 William E Greenawalt Process of smelting finely divided metallic ore
US3366465A (en) * 1962-06-22 1968-01-30 American Smelting Refining Cast copper wire bar
US4301997A (en) * 1978-06-30 1981-11-24 Southwire Company Continuous copper melting furnace
US4315775A (en) * 1979-11-28 1982-02-16 Southwire Company Continuous melting and refining of secondary and/or blister copper
US4402492A (en) * 1982-06-16 1983-09-06 United States Steel Corporation Burner apparatus for molten metal fume suppression
US4536152A (en) * 1983-04-04 1985-08-20 Asarco Incorporated High-velocity gas burners
US4844426A (en) * 1985-02-04 1989-07-04 Southwire Company Vertical shaft furnace for melting aluminum
US4795490A (en) * 1987-12-22 1989-01-03 Essex Group, Inc. Inert gas purging during shaft furnace shut down
US5744093A (en) * 1996-07-04 1998-04-28 Desom Enviromental Systems Limited Cover for launders

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