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US3820770A - Sub hearth construction for metallurgical furnaces - Google Patents

Sub hearth construction for metallurgical furnaces Download PDF

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Publication number
US3820770A
US3820770A US00382800A US38280073A US3820770A US 3820770 A US3820770 A US 3820770A US 00382800 A US00382800 A US 00382800A US 38280073 A US38280073 A US 38280073A US 3820770 A US3820770 A US 3820770A
Authority
US
United States
Prior art keywords
hearth
carbon
sub
construction
layers
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.)
Expired - Lifetime
Application number
US00382800A
Other languages
English (en)
Inventor
R Snow
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.)
United States Steel Corp
Original Assignee
Steel Corp
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
Priority to US00382800A priority Critical patent/US3820770A/en
Application filed by Steel Corp filed Critical Steel Corp
Priority to AU69526/74A priority patent/AU6952674A/en
Priority to JP49068253A priority patent/JPS5050204A/ja
Priority to IT69040/74A priority patent/IT1014406B/it
Publication of US3820770A publication Critical patent/US3820770A/en
Application granted granted Critical
Priority to DE2432992A priority patent/DE2432992A1/de
Priority to GB3192974A priority patent/GB1427646A/en
Priority to BE146863A priority patent/BE818002A/fr
Priority to FR7425719A priority patent/FR2238762B3/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C21B7/04—Blast furnaces with special refractories
    • C21B7/06—Linings for furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/10—Cooling; Devices therefor
    • C21B7/106—Cooling of the furnace bottom

Definitions

  • a bottom-cooled blast furnace hearth is conventionally installed with carbon side walls and a plug made up of layers of fireclay block disposed on a base made up of a plurality of layers of carbon blocks or beams.
  • heat is removed from the lowermost layer of carbon beams or blocks by 'means of cooling air or water circulated through pipes that are installed in the lowermost layer of carbon beams or blocks.
  • the fireclay plug of a conventional sub-hearth construction may be lost in the first 3 to 6 months of the furnace campaign, allowing molten iron to filter into the pores of the carbon beams thereby increasing the heat conductivity thereof.
  • the molten iron on the hearth floor might sometimes be undersaturated with respect to carbon, and, in the absence of the fireclay plug, the deficient amount of carbon is obtained from the carbon beams. This results in erosionof the carbon beams or blocks.
  • more important is the heat loss from the hearth throughthe carbon beams orblocks which normally have a heat conductivity of approximately 100 Btu/sq ft/F/hr/inch. The removal of this heatfro m the carbon beams or blocks is costly because of the coolingwater or air whichhas to be circulated in the pipes disposed in the earbon beams orblocks.
  • FIG. 1 is a diagrammatic vertical section view of the prior art sub-hearth construction of a blast furnace.
  • FIG. 3 is a modification of the sub-hearth construction shown in FIG. 2.
  • FIG. 4 is another modification of the sub-hearth construction shown in FIG. 2.
  • the barrier layer 12 may extend co-extensively with the carbon beams.
  • Sub-hearth construction as defined by claim 1 including a conduit for cooling fluid extending through the lowermost of said plurality of layers of carbon.
  • Sub-hearth construction as defined by claim 1 in which said layer of non-iron-reactive material is surrounded by said carbon inner lining.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Blast Furnaces (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
US00382800A 1973-07-26 1973-07-26 Sub hearth construction for metallurgical furnaces Expired - Lifetime US3820770A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US00382800A US3820770A (en) 1973-07-26 1973-07-26 Sub hearth construction for metallurgical furnaces
AU69526/74A AU6952674A (en) 1973-07-26 1974-05-29 Metallurgical furnaces
JP49068253A JPS5050204A (fr) 1973-07-26 1974-06-17
IT69040/74A IT1014406B (it) 1973-07-26 1974-06-27 Struttura di sottocrogiuolo per forni metallurgici
DE2432992A DE2432992A1 (de) 1973-07-26 1974-07-09 Unterherdkonstruktion fuer metallurgische oefen
GB3192974A GB1427646A (en) 1973-07-26 1974-07-18 Sub-hearth construction for metallurgical furnaces
BE146863A BE818002A (fr) 1973-07-26 1974-07-23 Infrastructure de creuset pour fours metallurgiques
FR7425719A FR2238762B3 (fr) 1973-07-26 1974-07-24

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00382800A US3820770A (en) 1973-07-26 1973-07-26 Sub hearth construction for metallurgical furnaces

Publications (1)

Publication Number Publication Date
US3820770A true US3820770A (en) 1974-06-28

Family

ID=23510458

Family Applications (1)

Application Number Title Priority Date Filing Date
US00382800A Expired - Lifetime US3820770A (en) 1973-07-26 1973-07-26 Sub hearth construction for metallurgical furnaces

Country Status (8)

Country Link
US (1) US3820770A (fr)
JP (1) JPS5050204A (fr)
AU (1) AU6952674A (fr)
BE (1) BE818002A (fr)
DE (1) DE2432992A1 (fr)
FR (1) FR2238762B3 (fr)
GB (1) GB1427646A (fr)
IT (1) IT1014406B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858861A (en) * 1974-01-17 1975-01-07 United States Steel Corp Underhearth cooling system
US4325538A (en) * 1979-12-27 1982-04-20 Biuro Projektow Przemyslu Metali Niezelaznych "Bipromet" Smelting furnace for direct obtaining of copper from ore concentrates/and copper ores
US4377277A (en) * 1979-08-03 1983-03-22 Nippon Steel Corporation Blast furnace having a cooling device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4157815A (en) * 1978-04-28 1979-06-12 Inland Steel Company Furnace bottom construction with seal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858861A (en) * 1974-01-17 1975-01-07 United States Steel Corp Underhearth cooling system
US4377277A (en) * 1979-08-03 1983-03-22 Nippon Steel Corporation Blast furnace having a cooling device
US4325538A (en) * 1979-12-27 1982-04-20 Biuro Projektow Przemyslu Metali Niezelaznych "Bipromet" Smelting furnace for direct obtaining of copper from ore concentrates/and copper ores

Also Published As

Publication number Publication date
JPS5050204A (fr) 1975-05-06
DE2432992A1 (de) 1975-02-13
BE818002A (fr) 1975-01-23
IT1014406B (it) 1977-04-20
FR2238762B3 (fr) 1977-05-20
GB1427646A (en) 1976-03-10
FR2238762A1 (fr) 1975-02-21
AU6952674A (en) 1975-12-04

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Legal Events

Date Code Title Description
AS Assignment

Owner name: USX CORPORATION, A CORP. OF DE, STATELESS

Free format text: MERGER;ASSIGNOR:UNITED STATES STEEL CORPORATION (MERGED INTO);REEL/FRAME:005060/0960

Effective date: 19880112