WO1995016795A1 - Dispositif de reparation d'un fourneau par projection - Google Patents

Dispositif de reparation d'un fourneau par projection Download PDF

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Publication number
WO1995016795A1
WO1995016795A1 PCT/US1994/014333 US9414333W WO9516795A1 WO 1995016795 A1 WO1995016795 A1 WO 1995016795A1 US 9414333 W US9414333 W US 9414333W WO 9516795 A1 WO9516795 A1 WO 9516795A1
Authority
WO
WIPO (PCT)
Prior art keywords
spray
furnace
spraying
machines
valve
Prior art date
Application number
PCT/US1994/014333
Other languages
English (en)
Other versions
WO1995016795A9 (fr
Inventor
Y. Kumagaya
N. Nagahara
Original Assignee
Minteq International Inc.
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 Minteq International Inc. filed Critical Minteq International Inc.
Priority to AU15132/95A priority Critical patent/AU692219B2/en
Publication of WO1995016795A1 publication Critical patent/WO1995016795A1/fr
Publication of WO1995016795A9 publication Critical patent/WO1995016795A9/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • 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
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/44—Refractory linings
    • C21C5/441—Equipment used for making or repairing linings
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
    • 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
    • F27D2003/0001—Positioning the charge
    • F27D2003/0006—Particulate materials
    • F27D2003/001—Series of dispensers or separation in teo or more parts
    • 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
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/008—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising cross-beams or gantry cranes
    • 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
    • F27D3/12—Travelling or movable supports or containers for the charge
    • F27D2003/125—Charging cars, lift trolleys

Definitions

  • the present invention relates to a device for repairing the lining covering the inside of a furnace shaft which has been melt damaged by heat, by spraying a spray material, and in particular relates to a multi-tank spraying repair device intended to repair the necessary places rapidly by automatically and continuously expelling a large amount of spray material.
  • This furnace spraying repair device 1 consists of a hopper 3 which receives spray material with which bags 2, which are transported by means of a fork lift or the like, are filled, a pre-dampener 6 which mixes in primary added water to the spray material by means of a spray means 5 whilst is fed said spray material from said hopper 3 by means of a feeder 4, a spray machine 7 which receives the spray material which has been pre-adj sted by means of said pre-dampener 6, and an air conveying means 11 for pneumatically conveying the spray material which is accommodated within said spray machine 7 to a furnace automatic spraying machine 10 which is located inside the furnace 9, using a material hose 8 or the like.
  • Spray machines which are widely used as the spray machine 7 used in this example include: as shown in Figure 4 (A) for example, a torque let double construction chamber type spray machine in which two chambers, an upper chamber and a lower chamber, are each connected such that they can be opened and closed, by means of unidirectional valves, and in which material is supplied from the lower chamber; as shown in Figure 4 (B) for example, a rotor type spray machine in which a rotor which has a plurality of passages which pass through in the vertical direction is rotated around a vertical axis whilst supplying material; and as shown in Figure 4 (C) for example, a blade gun type spray machine with an attached rotary feeder in which a rotary which has a pair of channels extending in the horizontal direction rotates around a horizontal axis whilst supplying material.
  • Figure 4 (A) for example, a torque let double construction chamber type spray machine in which two chambers, an upper chamber and a lower chamber, are each connected such that they can be opened and closed, by means of
  • a repair device 1 when spray material in the form of cement powder passes through the pre-dampener 6, it is continuously supplied to the spray machine 7 in a state in which primary added water has been added, and the spray material which has been supplied in this way passes through the valve, rotor or rotary, for example, in the spray machine 7, and is then sent from the spray machine 7 via the material hose 8 to the furnace automatic spray machine 10 which is located in the furnace 9, by means of a high pressure means 11 which comprises, for example, an air compressing means such as an air compressor, and a compressed air conveying means such as an air hose which conveys compressed air generated by means of the air compressing means, and then after a prescribed amount of water has been mixed into the material, said material is sprayed onto the melt damaged portions of the shaft of the furnace 9 from the nozzle :-f the furnace automatic spray machine 10, thereby effecting the prescribed repair.
  • a high pressure means 11 which comprises, for example, an air compressing means such as an air compressor, and a compressed air conveying means such as an air
  • Such repair work is performed continuously from the start of spraying after the spray material has been input into the hopper 3, until spraying is complete, and the work is performed by remote control whilst an operative at the top of the shaft of the furnace 9 looks inside the furnace 9 through an opening 12.
  • spray repairing device 1 the places to be repaired and the state of the melt damage are estimated in advance, and the repair work is performed whilst the hopper 3 is continuously filled with the amount of repair material required to effect the repairs.
  • furnace spraying repair devices 1 have been of the order of 5 to 7 tons per hour, and this capability is extremely small for a device which is intended to repair, in particular, the recent large scale furnace, and thus the spray repair time is extended and therefore the downtime of the furnace is correspondingly extended.
  • a furnace spraying repair device to be developed having the capability to expel an amount of spray of the order of 10 to 20 tons or more per hour.
  • the torque let double construction chamber type device has the disadvantage that, since it has a double chamber which is opened by the action of a valve, it is suitable for small amounts of expulsion but does not lend itself to large amounts of expulsion, and further the operation during opening and closing of the valve, for example, requires skill.
  • the rotor type and-rotary type devices have the disadvantage that it is necessary to replace rubber seal materials which are provided around said rotor and rotary, since during the spraying operation they are liable to wear, and it is necessary to interrupt the operation frequently, there are many expendable items, and the running costs are extremely high. Further, the maximum amount of spray expulsion is no more than about 7 tons per hour in practice, and this is far from reaching the required rate of 10 to 20 tons per hour.
  • the spray machine also requires a high degree of skill in controlling the expulsion pressure and expulsion quantity.
  • the pre-dampener 6 which mixes primary added water to the repair material when said repair material is input into the spray machine, is indispensable in order to prevent the occurrence of dust in the spray machine 7 and to aim to increase the expelled amount of material, and thus said repair material often becomes attached inside the device and sets during operation, and the situation often arises that the repair operation must be interrupted in order to carry out cleaning.
  • repair devices 1 in the past it has always been necessary to prepare two pre-dampeners 6 and spray machines 7, and an operating procedure is required in which whilst one is being used the other is being cleaned.
  • the present invention is arranged such that a plurality of spray machines are provided linked together, and a large amount of repair material can be continuously supplied. Furthermore, the transportation cycle of the material is a completely closed cycle and thus pollution of the working environment is prevented to the utmost. Furthermore, the pre-dampener does not need to be used, the mixing process with primary added water is eliminated, and clogging of the device due to the setting of material, and the necessity to replace components are minimized. Furthermore, all of the operation of the whole device is incorporated in a prescribed program, and the operations which need to be performed by operatives are extremely simple.
  • the present invention has the capability to expel a large amount of repair material to complete the repairs to large scale furnaces in a short time. Further, since the spray material powder is only transported in a closed cycle, the surrounding environment is not polluted by dust from said material powder, or the like. Furthermore, since the pre-dampener is not needed, there is no danger that the material will set before reaching the inside of the furnace, and the amount thereof, the transfer rate and the output pressure, for example, can be rigorously controlled with certainty, whilst problems such as clogging of the device and wear of components can be completely eliminated. Furthermore, since the operating procedure is completely programmed, it is possible for the operation performed by the operatives to be greatly simplified. Brief Description of the Drawings
  • FIG. 1 An explanatory diagram showing the whole of the present invention.
  • FIG. 2 An enlargement of part of the present invention.
  • Figure 3 An explanatory diagram of the whole of a known device.
  • Figure 4 A diagram showing the inside of the spray machine of a known device. c Explanation of the References
  • valve 52 Y-shaped tube
  • valve 56 valve
  • the furnace spraying repair device 20 consists of a plurality (only 2 are shown in Figure 1) of spray material input hoppers 28 which receive spray material in powdered form, with which bags 26, which are transported by means of an electric hoist 24 to which trolleys are attached via a hoist I beam or the like 22, are filled, a spray machine 30 which is provided at the bottom of said hopper 28, a material hose 36 which sends the supply material from said spray machine 30 to an automatic spray machine 34 inside the furnace 32, in the powdered state, and an air conveying means 38 for supplying the material from the above-mentioned hopper 28 via the hose 36, in the powdered state.
  • furnace spraying repair device 20 which is shown in the diagrams comprises 2 hoppers 28 and spray machines 30, but it will be clear to one skilled in the art that they are not limited to 2 units.
  • each spray machine 30 It is desirable for the capacity of each spray machine 30 to be at least 2 tons of furnace material.
  • the spray material is input into the hoppers 28 by means of the hoist 24.
  • the bags 26 which are flexible containers accommodating the spray material are desirably automatically opened by means of a flexible container cutter 40 which is accommodated inside the hopper 28, as shown in Figure 2.
  • a spray machine main body in other words a furnace material tank 44, which has at its neck a butterfly valve 42 with an attached actuator which adjust the supply of material, and, at its shoulder, an automatic exhaust valve 45 with an attached actuator, which is connected to the inside, is provided at the bottom of the hopper 28.
  • the spray material with which the hopper 28 is filled drops down into the furnace material tank 44 by opening the exhaust valve 45 and opening said butterfly valve 42 which has an attached actuator. After this input, said butterfly valve 42 which has an attached actuator, and the above-mentioned automatic exhaust valve 45 which has an attached actuator for discharging air from said tank 44 are closed. This completes the preparation operations. It is preferable for the preparation operations to be performed simultaneously for all of the spray machines 30.
  • the amount of spray material received into each tank 44 at this time is continuously displayed on an automatic control panel 48 by means of load cells 46.
  • the spray start button on the control panel 48 is then switched on.
  • one of the ball valves 50 which have attached actuators and which are provided at the bottom of the spray machines 30 is first opened, and compressed air for pressure conveying the spray material, which compressed air is supplied in a stabilized state via a known air receiver tank from the compressor, or the like, of the air conveying means 38, flows via the bottom of the tank 44.
  • the ball valve 54 which has an attached actuator, on one spray machine side of a flow-dividing Y-shaped tube 52 is opened, and the ball valve 56 which has an attached actuator, on the other spray machine side is closed.
  • a variable dose feeder 58 which is attached with freedom to rotate inside the above-mentioned one spray machine 30 begins to rotate, and the spray material inside the tank 44 is conveyed to the furnace automatic spray machine 34 through the material hose 36 by means of compressed air. It should be noted that the operation of these valves etc. is driven automatically by means of electromagnetic valve operation by means of compressed air from an air compressor, or the like, which is operated by means of an automatically controlled programmed procedure.
  • the ball valves 50 and 54 of one spray machine 30 are closed by means of an instruction from the control panel 48, and furthermore the supply of compressed air stops and the feeder 58 stops.
  • the valve 50 of the other spray machine 30 which is provided adjacently, and the valve 56 of the Y-shaped tube are opened, compressed air for conveying flows into said spray machine, and the feeder of said spray machine begins to rotate, and the same material supply operation continues without interruption.
  • input of material into the emptied spray machine 30 can be performed by means of the following procedure. To elaborate, firstly the exhaust valve 45 which has an attached actuator is opened, and air remaining within the tank 44 of said spray machine 30 is dispelled to the atmosphere. The valve 42 which has an attached actuator is then opened, and material with which the hopper 28 has been filled in advance is supplied into the tank 44.
  • the inside of the spray machine 30 is connected to the atmosphere by means of the exhaust valve 45, in order to achieve simple filling of material from the hopper 28, but it is also possible for said exhaust valve 45 to be connected to a negative pressure source and for said tank 44 to be put in a negative pressure state only when this is required. Furthermore, it is possible to supply high pressure air from said valve 45 when material is supplied from the tank 44 in order to plan to regulate the supply of material.
  • the diameter of the butterfly valve 42 which has an attached actuator is approximately 50% larger than the diameter in conventional spray machines, and thus material in the hopper 28 can be input into the spray machine main body 44 in a short time;
  • the blade pitch of the material supply feeder 58 is approximately twice that of the pitch of conventional spraying machines, and thus it is possible to expel a large amount of spray material continuously;
  • the diameter of the exhaust valve 45 is approximately twice that in conventional spray machines, and thus it is possible to expel air remaining inside the spray machine main body 44 after spraying, rapidly to the atmosphere;
  • the material on the inside surfaces of the ball valves 50, 54 and 56 which have attached actuators has been changed to a material which has good anti-abrasion properties, and thus high quantity expulsion can be performed continuously for a long time;
  • a flexible container cutter 40 is provided inside the hopper 28, and thus flexible -container bags 26 which have been input into the hopper 28 can be automatically and rapidly opened; and spraying operations can be performed continuously by using a plurality of batch type spray machines
  • the diameter of the spray machine main body 44 in the present invention is approximately 30% larger than that in conventional spray machines, but the height is reduced, and thus by maintaining capacity and making the hoppers 28 such that they can be removed, they are within the height limits for highways, and can thus be transported easily at any time.
  • the actual amount of material which is expelled in a known device is from 5 tons per hour to a maximum of only 10 tons.
  • the device of the present invention allows variable dose expulsion amounts of between 5 tons per hour and a maximum of 20 tons.
  • the spray repair mc orial is normally a powdered fire resistant material.
  • primary added water is mixed into said spray repair material when it is supplied from the hopper 3 to the spray machine 7, and this is all performed in an open cycle, resulting in unmixed material causing dust at all times.
  • an operative must always monitor the state of the primary added water supply in the pre-dampener 6, and must determine the state of mixing between the material and the added water, and furthermore the pressure and quantity, for example, of the mixed material in the spray machine 7 must constantly be monitored, and the optimum amount of material must be expelled in the optimum state from the nozzle of the furnace automatic spray machine 10. Furthermore, this work requires skill obtained over many years.

Landscapes

  • 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)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention porte sur des trémies (28) contenant un matériau à projeter, des machines de projection placées à la base des trémies (28), un tuyau de transfert du matériau depuis les machines de projection vers une machine automatique de projection (34) placée à l'intérieur du fourneau (32), et un moyen pneumatique de transport (38) du matériau depuis les trémies (28) vers la machine automatique de projection (34) en passant par le tuyeau (36).
PCT/US1994/014333 1993-12-13 1994-12-12 Dispositif de reparation d'un fourneau par projection WO1995016795A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU15132/95A AU692219B2 (en) 1993-12-13 1994-12-12 Furnace spraying repair device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP932192 1993-12-13
JP93219293 1993-12-13

Publications (2)

Publication Number Publication Date
WO1995016795A1 true WO1995016795A1 (fr) 1995-06-22
WO1995016795A9 WO1995016795A9 (fr) 1995-07-20

Family

ID=18529004

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/014333 WO1995016795A1 (fr) 1993-12-13 1994-12-12 Dispositif de reparation d'un fourneau par projection

Country Status (5)

Country Link
KR (1) KR100360976B1 (fr)
CN (1) CN1137295A (fr)
AU (1) AU692219B2 (fr)
TW (1) TW263533B (fr)
WO (1) WO1995016795A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100431764C (zh) * 2006-07-20 2008-11-12 鞍山赛拉美克热陶瓷工程有限公司 工业炉窑火焰焊补机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103740874A (zh) * 2013-12-30 2014-04-23 苏州市层燃炉窑科技有限公司 一种高炉
CN103740876A (zh) * 2013-12-30 2014-04-23 苏州市层燃炉窑科技有限公司 一种新型的高炉

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4875662A (en) * 1986-10-29 1989-10-24 Bmi, Inc. Method and apparatus for relining blast furnace
US5160692A (en) * 1989-04-26 1992-11-03 Daussan Et Compagnie Process and plant for producing a lining on the inner walls of a metallurgical vessel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4793595A (en) * 1986-10-29 1988-12-27 Bmi, Inc. Method and apparatus for relining blast furnace

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4875662A (en) * 1986-10-29 1989-10-24 Bmi, Inc. Method and apparatus for relining blast furnace
US5160692A (en) * 1989-04-26 1992-11-03 Daussan Et Compagnie Process and plant for producing a lining on the inner walls of a metallurgical vessel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100431764C (zh) * 2006-07-20 2008-11-12 鞍山赛拉美克热陶瓷工程有限公司 工业炉窑火焰焊补机

Also Published As

Publication number Publication date
AU1513295A (en) 1995-07-03
TW263533B (fr) 1995-11-21
CN1137295A (zh) 1996-12-04
KR100360976B1 (ko) 2003-03-03
KR960706567A (ko) 1996-12-09
AU692219B2 (en) 1998-06-04

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