US3722814A - Method of blowing such fluid as reducing gas into a furnace - Google Patents

Method of blowing such fluid as reducing gas into a furnace Download PDF

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Publication number
US3722814A
US3722814A US00113862A US3722814DA US3722814A US 3722814 A US3722814 A US 3722814A US 00113862 A US00113862 A US 00113862A US 3722814D A US3722814D A US 3722814DA US 3722814 A US3722814 A US 3722814A
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US
United States
Prior art keywords
furnace
tuyere
fluid
nozzle
blowing
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
US00113862A
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English (en)
Inventor
T Miyashita
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.)
JFE Engineering Corp
Original Assignee
Nippon Kokan Ltd
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 Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Application granted granted Critical
Publication of US3722814A publication Critical patent/US3722814A/en
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • 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
    • F27B1/005—Shaft or like vertical or substantially vertical furnaces wherein no smelting of the charge occurs, e.g. calcining or sintering furnaces

Definitions

  • ABSTRACT A method and apparatus for (a) injecting fluids, particularly reducing gases, through a tuyere into an operating furnace, and (b) safely cleaning out plugged tuyeres, in which a seal is provided in the tuyere so that a back pressure in excess of the furnace pressure can be developed.
  • a rotatable borer is provided forwardly of the seal to remove solids plugging the tuyere.
  • the seal and the borer are coakially mounted on a retractable shaft so that they can be simultaneously withdrawn and fluid injection resumed immediately the tuyere is cleaned.
  • blowing of reducing gas or other fluids into a furnace or other operation under high pressure has come to require a safe and secure method of blowing such reducing gas through nozzles into the furnace, usually a shaft furnace, in which materials are contained and the inner pressure of which is higher than that of the atmosphere, without interfering with operation.
  • a tuyere of a nozzle is blocked up with solid material in the furnace, the solid material is removed by driving a metal rod into the solid material with a hammer in order to punch a hole and let air into the furnace or by inserting an iron pipe through which oxygen is supplied and burnt to make a hole in the clogged material in the tuyeres to let air into the furnace.
  • the nozzle of the boring apparatus is provided with fluid at a higher pressure than that within the furnace in order to prevent materials or gas in the furnace from flowing back to the nozzle, and then said fluid is blown into the furnace.
  • Another object of the present invention is to provide a boring apparatus for use in the method of cleaning tuyeres and blowing such fluids as reducing gas into a furnace, comprising: a driving tube to which a sealing valve for a tuyere is fixed and which tube is longitudinally movable in a nozzle which is equipped with a cooling device; a boring shaft, longitudinally movable and rotatable, inserted in the said driving tube; and a boring means mounted at the end of the said boring shaft in such a way as to be projected forwardly of the sealing valve.
  • FIG. 1 shows a longitudinal section of a boring apparatus for use in the method of the present invention, a part of which is omitted;
  • FIG. 2 is a cross-sectional view of the boring apparatus shown in FIG. 1 taken along the line A-A;
  • FIG. 3 is an enlarged section of the rear seal shown in FIG. 1.
  • the boring apparatus of the present invention is provided with a nozzle 1, pipes 2 for supplying and draining water provided around the inner circumference of the nozzle to cool the nozzle as required, a tuyere 3 at the end of the nozzle in such a way as to be projected forwardly therefrom, and pipes 4 for supplying and draining water which are provided in the tuyere 3 and connected to the pipes 2 to cool the tuyere.
  • Water-supplying pipe 5 to supply the pipes 2 in the nozzle 1 with water and a drainage pipe 6 to drain water from the same are provided at the rear part of the nozzle 1.
  • a sealing valve 8 for the tuyere 3 of the nozzle 1 is fixed to the end of a driving tube 7 and a driving means 9 provided at the rear part of the nozzle 1 is connected to the driving tube 7.
  • the driving tube 7 is set in longitudinal motion in the nozzle 1 by the driving means 9 to automatically shut or open the tuyere 3 of the nozzle 1 with the sealing valve 8.
  • a boring shaft 10 to which a boring means 11 is fixed is inserted in the driving tube 7 in such a way as to be projected forwardly through the sealing valve 8 and connected at the rear end thereof to the driving means 9.
  • the boring shaft 10 is arranged in such a way as to be longitudinally movable and rotatable independently of the motion of the driving tube 7 after the tuyere 3 is shut with the sealing valve 8 by means of the forward motion of the driving tube 7.
  • O-shaped rings 12 are provided in the seal at the rear end of the nozzle 1 and a packing 13 is interposed between the driving tube and the threaded part of a tightening cap 14.
  • the nozzle 1 is provided with a lining 15 around the inner circumference thereof and an opening 16 for blowing fluid into the nozzle 1.
  • l7 denotes a furnace body and 18 a material stuck to the wall of the furnace.
  • a fluid such as nitrogen gas, air or gas/powder mixtures is blown into the nozzle 1 from the opening 16 to create a back pressure which is higher than that within the furnace against the sealing valve.
  • the boring shaft 10 is pushed forward and simultaneously rotated by means of the driving-means 9 to makea hole in the material 18 stuck to the front part of the tuyere 3 of the nozzle 1, thus removing the material 18.
  • the driving means 9 is operated to draw back the boring means 11 fixed to the boring shaft 10, and the driving tube 7. Subsequently,
  • the sealing valve 8 sealing the tuyere 3 is simultaneously drawn back to leave the tuyere, and fluid begins to flow into the furnace through the nozzle 1.
  • the present invention facilitates removal of material stuck to the front part of the tuyere 3 of the nozzle 1 or solid materials floating therein by means of the boring apparatus comprised in the nozzle 1 while blowing of fluid into the furnace is stopped temporarily.
  • it is possible not only to prevent removed materials from flowing backward to the nozzle or stopping up the boring shaft but also to completely prevent the materials or gas in the furnace from flowing backward by maintaining a back pressure higher than that-within the furnace against the sealing valve and the inside of the nozzle 1 while the boring operation is conducted.
  • remote control of the boring apparatus facilitates a safe and secure boring operation during operation of the furnace. Consequently, interruption of the furnace operation is not required even when the boring operation must be conducted when a high-temperature reducing gas is blown into the furnace.
  • the present invention may be applied to any nozzles for blowing fluid into a furnace, e.g. those of blast furnaces, cupolas, shaft reduction furnaces or furnaces of any industrial type. Excellent results can be obtained with any of such nozzles.
  • a method of removing solid material from a furnace tuyere through which a fluid is blown into an' operating furnace comprising: generating a fluid back pressure in said tuyere against a sealing means provided in said tuyere such that said back pressure is greater than the fluid pressure in said furnace, passing a rotatable boring device forwardly through said sealing means, rotating said boring device whereby a hole is bored through said solid material, withdrawing said boring device and said sealing means and blowing said fluid through saidtuyere and said hole into said operating furnace.
  • a method as claimed in claim 1 wherein said fluid is selected from, a reducing gas, nitrogen, air and gas/powder mixtures.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
US00113862A 1970-02-13 1971-02-09 Method of blowing such fluid as reducing gas into a furnace Expired - Lifetime US3722814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45012147A JPS497283B1 (fr) 1970-02-13 1970-02-13

Publications (1)

Publication Number Publication Date
US3722814A true US3722814A (en) 1973-03-27

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ID=11797370

Family Applications (1)

Application Number Title Priority Date Filing Date
US00113862A Expired - Lifetime US3722814A (en) 1970-02-13 1971-02-09 Method of blowing such fluid as reducing gas into a furnace

Country Status (6)

Country Link
US (1) US3722814A (fr)
JP (1) JPS497283B1 (fr)
BE (1) BE762896A (fr)
CA (1) CA939506A (fr)
FR (1) FR2078550A5 (fr)
GB (1) GB1311050A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4913735A (en) * 1989-02-09 1990-04-03 Palmer Manufacturing & Supply, Inc. Flux injector lance for use in processing aluminum and method
US5112216A (en) * 1988-12-22 1992-05-12 Chemetics International Company Inc. Pulp mill gas combustion process
US20060226254A1 (en) * 2004-05-06 2006-10-12 Luis Cerda Method for unlocking nozzles of reactors
CN112916267A (zh) * 2021-01-23 2021-06-08 南京德马吉环保科技有限公司 一种防结块的喷漆设备
CN113846324A (zh) * 2020-06-26 2021-12-28 广西福煌实业有限公司 一种喷涂热加温生产系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53131074U (fr) * 1977-03-25 1978-10-18
CN114480770B (zh) * 2022-01-31 2023-03-14 新疆八一钢铁股份有限公司 一种欧冶炉的气化炉降料面停炉方法

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5112216A (en) * 1988-12-22 1992-05-12 Chemetics International Company Inc. Pulp mill gas combustion process
US4913735A (en) * 1989-02-09 1990-04-03 Palmer Manufacturing & Supply, Inc. Flux injector lance for use in processing aluminum and method
US20060226254A1 (en) * 2004-05-06 2006-10-12 Luis Cerda Method for unlocking nozzles of reactors
US7371342B2 (en) * 2004-05-06 2008-05-13 Corporation Nacional Del Cobre De Chile Method for unlocking nozzles of reactors
CN113846324A (zh) * 2020-06-26 2021-12-28 广西福煌实业有限公司 一种喷涂热加温生产系统
CN112916267A (zh) * 2021-01-23 2021-06-08 南京德马吉环保科技有限公司 一种防结块的喷漆设备

Also Published As

Publication number Publication date
DE2106122B2 (de) 1975-10-02
FR2078550A5 (fr) 1971-11-05
BE762896A (fr) 1971-07-16
JPS497283B1 (fr) 1974-02-19
DE2106122A1 (de) 1971-08-19
CA939506A (en) 1974-01-08
GB1311050A (en) 1973-03-21

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