EP2387620B1 - Shaft furnace charging installation - Google Patents
Shaft furnace charging installation Download PDFInfo
- Publication number
- EP2387620B1 EP2387620B1 EP10700743.7A EP10700743A EP2387620B1 EP 2387620 B1 EP2387620 B1 EP 2387620B1 EP 10700743 A EP10700743 A EP 10700743A EP 2387620 B1 EP2387620 B1 EP 2387620B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- panel
- fluid
- fluid channels
- heated
- charge material
- 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.)
- Not-in-force
Links
Images
Classifications
-
- 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
- F27D3/10—Charging directly from hoppers or shoots
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/18—Bell-and-hopper arrangements
- C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
-
- 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
- F27B1/20—Arrangements of devices for charging
Definitions
- dust build-up due to condensation of blast furnace gas in combination with wet equalizing gas and dust particles from the charge material, may occur.
- dust build-up may accumulate on a protection ring and hinder the material gate from properly closing the hopper discharge opening.
- the limit switch which indicates that the material gate is in its closed position, may not be activated.
- the charging sequence is thereby interrupted and is then necessary either to mechanically remove the build-up or to change the limit switch position.
- the latter can however cause further problems such as excessive wear on the seal on the sealing valve arranged downstream. This is caused by the fact that the material gate is not correctly closed and that a larger gap allows more charge material to leak through the closed material gate.
- the dust build-up may be such that, in the closed position of the material gate, the latter rests on the dust build-up, thereby falsifying the weighing results of the charge material fed into the hopper.
- the copper heated panels also provide good heat transfer, enabling the heated plate to be heated to a higher temperature, when compared to the conventional stainless steel heated panels.
- the fluid channels comprise a fluid inlet and a fluid outlet, the fluid inlet and outlet being connected to a fluid circuit for delivering a hot fluid, e.g. steam, to the heated panel.
- a hot fluid e.g. steam
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Charging Or Discharging (AREA)
- Tunnel Furnaces (AREA)
- Furnace Details (AREA)
Description
- The present invention generally relates to a shaft furnace charging installation, in particular to a discharge assembly arranged between a storage hopper and the shaft furnace.
- While not limited thereto, the present invention is particularly well suited for use in a shaft furnace charging installation of the Bell Less Top™ type as disclosed in
US 3,693,812 . In this type of charging installation, the furnace is provided with at least two intermediate storage hoppers, which may be alternately opened to ambient atmosphere for loading material therefrom to the interior of the pressurized furnace via a discharge channel. Such furnace charging installations, as shown inUS 4,074,835 , employ a pair of serially arranged valves between the storage hopper and the furnace. The first valve or material gate performs a material flow control or metering function, by increasing or reducing the area of the storage hopper discharge opening and thereby assists in the achievement of a desired distribution of material on the furnace hearth. The second valve or sealing valve functions to establish a hermetic seal required to permit the alternate pressurizing and depressurizing of the storage hopper. -
JP2000-313909 - In the area of the material gate, dust build-up, due to condensation of blast furnace gas in combination with wet equalizing gas and dust particles from the charge material, may occur. Such dust build-up may accumulate on a protection ring and hinder the material gate from properly closing the hopper discharge opening. The limit switch, which indicates that the material gate is in its closed position, may not be activated. The charging sequence is thereby interrupted and is then necessary either to mechanically remove the build-up or to change the limit switch position. The latter can however cause further problems such as excessive wear on the seal on the sealing valve arranged downstream. This is caused by the fact that the material gate is not correctly closed and that a larger gap allows more charge material to leak through the closed material gate.
- Also, the dust build-up may be such that, in the closed position of the material gate, the latter rests on the dust build-up, thereby falsifying the weighing results of the charge material fed into the hopper.
- In order to avoid such dust build-up, it has been suggested to provide a steam heated panel behind the octagonal chute of the hopper. By heating such a heated panel to a temperature of about 120°C, condensation can be avoided, which means that dust-build-up and its consequences can also be avoided. Such a heated panel consists of a stainless steel casing formed into a shape matching the shape of the octagonal chute. Stainless steel pipes are arranged inside the steel casing and embedded in a heat conductive concrete.
- It has been found that the conditions of the blast furnace gas are such that the stainless steel casing and/or the stainless steel pipes quickly corrode and that the heated panel is thereby quickly destroyed and steam is allowed to escape from the stainless steel pipes into the blast furnace or hopper environment.
- The object of the present invention is to provide an improved blast furnace charging system, wherein the above drawbacks are avoided. This object is achieved by a system as claimed in claim 1.
- To achieve this object, the present invention proposes a blast furnace charging system for feeding charge material into the hearth of a blast furnace, the system comprising at least two hoppers for temporarily storing charge material, each hopper comprising a discharge assembly for feeding the charge material from the respective hopper into the hearth of a blast furnace. The discharge assembly comprises an inclined discharge channel having, at its lower end, a material gate providing charge material flow control at the lower end of the discharge channel; and a protection ring arranged in the vicinity of the material gate for leading charge material from the discharge channel to a seal seat of the discharge assembly. The discharge assembly further comprises a heated panel arranged on the protection ring, the heated panel being formed by a panel-like copper body having fluid channels arranged therein so as to form a channel leading from a fluid inlet to a fluid outlet.
- The inventors have found that heated panels made of a panel-like copper body have good corrosion resistance against blast furnace gas, in particular against chlorides in the blast furnace gas. The heated panels according to the present invention therefore have longer lifetime and the risk of steam escaping from the fluid channels is reduced. This leads to a reduced number of maintenance interventions and hence fewer furnace stoppages.
- The copper heated panels also provide good heat transfer, enabling the heated plate to be heated to a higher temperature, when compared to the conventional stainless steel heated panels.
- The fluid channels in the panel-like copper body may be formed by casting. Alternatively, the fluid channels in the panel-like copper body may be formed by drilling. Plugs may be arranged in the end portions of the drilled fluid channels.
- Advantageously, the heated panel has a shape corresponding to the shape of the discharge channel, wherein the panel-like copper body is formed into the shaped heated panel after formation of the fluid channels therein.
- The heated panel preferably comprises a connection element for connecting the heated panel to the protection ring.
- A wear resistant copper alloy may further be arranged on a lower portion of a front face of the heated panel and on a front face of the connection element.
- Preferably, the fluid channels comprise a fluid inlet and a fluid outlet, the fluid inlet and outlet being connected to a fluid circuit for delivering a hot fluid, e.g. steam, to the heated panel.
- The present invention will be more apparent from the following description of a not limiting embodiment with reference to the attached drawings, wherein
-
Fig.1 : is a side view of a bell-less top charging system on a blast furnace; -
Fig.2 : is an enlarged side view of a portion of a discharge assembly of the system ofFig.1 ; and -
Fig.3 : is a cross-sectional view through a heated panel of the discharge assembly ofFig.2 . - In
Fig.1 ,reference 10 globally identifies a blast furnace. A Bell Less Top™ charging system 12 of the parallel hopper type uses, in a manner known per se, an angularly adjustablerotary chute 14 for distribution of charge material into the hearth of theblast furnace 10. Two storage ortop hoppers 16, 16' provide temporary storage of the charge material to be distributed by thechute 14. Aconveyor belt mechanism 18 provides feeding of thetop hoppers 16, 16' through afeeding assembly 20 arranged above and connected tohoppers 16, 16'. Thefeeding assembly 20 comprises acollecting cone 22 and a deviation chute 24 for selectively feeding and guiding charge material into eitherhopper 16 or 16'.Hoppers 16, 16' are constructed as pressure hoppers to insure that theblast furnace 10 remains sealed from the atmosphere during the charging process. Therefore,hoppers 16, 16' having an air lock function are each provided with upper and lower sealing valves (not shown). - A discharge assembly or valve block, globally identified by
reference 30 communicates with the lower open ends of thehoppers 16, 16'.Discharge cones 32, 32' at the respective lower open ends of thehoppers 16, 16' are connected bybellows 34, 34' todischarge channels 36, 36'. Throttle valves ormaterial gates 38, 38' provide charge material flow control at the lower ends of thedischarge channels 36, 36'. Accordingly, thematerial gates 38, 38' enable controlled discharge of charge material from thehopper 16 or 16' to therotary chute 14. Thematerial gates 38, 38' are set by hydraulic drives 40, 40'. Thus, charge material passes from thehoppers 16, 16' over thedischarge channels 36, 36' to acentral feeding spout 42, which directs the charge material vertically onto therotary chute 14. -
Fig.2 shows in more detail a portion of thedischarge assembly 30, showing adischarge channel 36 connected to adischarge cone 32 of ahopper 16. At alower end 42 of thedischarge channel 36, amaterial gate 38 is pivotably arranged so as to pivot between two positions. In a closed position, as shown inFig.2 , charge material is retained in thedischarge channel 36. In an open position, as shown in dotted lined inFig.2 , charge material is allowed to flow out of thedischarge channel 36 towards therotary chute 14. The rate of flow of charge material out of thedischarge channel 36 can be regulated by setting thematerial gate 38 in various intermediate positions. Aprotective casing 44 is arranged around thedischarge assembly 30 and has aseal seat 46 for feeding charge material to therotary chute 14. Asealing valve 48 is associated with theseal seat 46 for sealing the furnace hearth from thehopper 16, thereby allowing the filling of thehopper 16 with charge material without gas pressure drop in the furnace itself. - In the region of the
lower end 42 of thedischarge channel 36, the chargingsystem 12 comprises aprotection ring 50 generally arranged so as to protect theseal seat 46, in particular when thematerial gate 38 is almost in its closed position. - The
protection ring 50 is provided with aheated panel 52 designed and arranged so as to heat at least a portion of theprotection ring 50 in proximity to agate nose 54 of thematerial gate 38 when the latter is in its closed position. Due to theheated panel 52, the formation of condensation on theprotection ring 50 can be avoided. It should be noted that charging material dust is present in the vicinity of thematerial gate 38. Dust build up, which may otherwise occur due to the condensation of blast furnace gas in combination with wet equalizing gas and dust particles from the charge material, can be avoided. - The
heated panel 52 has anupper edge 56 and alower edge 58. At theupper edge 56, an so-calledair canon 60 is arranged for blowing air at very high speed, generally supersonic speed, onto afront surface 62 of theheated panel 52. This air helps to keep condensation and dust particles away from thefront surface 62 of theheated panel 52, thereby avoiding accumulation of dust on theprotection ring 50. - By keeping the
protection ring 50 essentially free from dust build-up, the correct functioning on thematerial gate 38 can be ensured at least in the sense that the correct closure of thematerial gate 38 cannot be prevented by such a dust build-up. - Furthermore, the weighing of the charge material in the
hopper 16 is adversely influenced if thematerial gate 38 rests on a dust build-up when in its closed position. By avoiding such a dust build-up, the weighing precision of weighing beams orload cells 64, one of which is shown inFig.2 , is maintained. - The
heated panel 52 itself will now be more closely described by referring toFig.3 . Theheated panel 52 is formed by a panel-like copper body 66 having afront face 62 and an oppositerear face 68, anupper edge 56 and alower edge 58 and two side edges. Within the panel-like copper body 66,fluid channels 70 are arranged so as to form a channel leading from afluid inlet 72 to afluid outlet 74. The fluid inlet andoutlet like copper body 66. - The
fluid channels 70 may be formed in the panel-like copper body 66 by casting or drilling. Indeed, the panel-like copper body 66 may be formed by casting the copper around a filler material, which can be removed later to reveal thefluid channels 70. Alternatively, thefluid channels 70 may be drilled into the panel-like copper body 66. Interconnecting fluid channels may also be drilled. Channel portions near the upper, lower or side edges of the panel-like copper body 66 may be plugged after drilling. Such channel portions are necessary to form thefluid channels 70 by drilling but need be plugged to form a continuous channel leading from thefluid inlet 72 to thefluid outlet 74. - After formation of the
fluid channels 70 in the panel-like copper body 66, the latter is further bent to a shape corresponding to the shape of thedistribution channel 36 andmaterial gate 38. - At its
lower edge 58, theheated panel 52 comprises an L-shapedconnection element 76 for allowing theheated panel 52 to be connected to theprotection ring 50. A wear resistant copper alloy may be hard faced onto a lower portion of thefront face 62 of the panel-like copper body 66 and onto theconnection element 76 for increasing wear resistance on theconnection element 76. -
10 blast furnace 48 sealing valve 12 charging system 50 protection ring 14 rotary chute 52 heated panel 16 hopper 54 gate nose 18 conveyor belt mechanism 56 upper edge 20 feeding assembly 58 lower edge 22 collecting cone 60 air canon 24 deviation chute 62 front surface 30 discharge assembly 64 load cell 32 discharge cone 66 panel- like copper body 34 bellow 68 rear face 36 discharge channel 70 fluid channel 38 material gate 72 fluid inlet 40 hydraulic drives 74 fluid outlet 42 central feeding spout 76 connection element 44 protective casing 78 wear resistant copper alloy 46 seal seat
Claims (8)
- Blast furnace charging system (12) for feeding charge material into the hearth of a blast furnace (10), said system (12) comprising at least two hoppers (16) for temporarily storing charge material, each hopper (16) comprising a discharge assembly (30) for feeding said charge material from the respective hopper (16) into the hearth of a blast furnace (10); said discharge assembly (30) comprising:an inclined discharge channel (36) having, at its lower end, a material gate (38) providing charge material flow control at the lower end of the discharge channel (36);a protection ring (50) arranged in the vicinity of the material gate (38) for leading charge material from said discharge channel (36) to a seal seat (46) of said discharge assembly (30);a heated panel (52) arranged on said protection ring (50), said heated panel (52) being formed by a panel-like copper body (66) having fluid channels (70) arranged therein so as to form a channel leading from a fluid inlet (72) to a fluid outlet (74).
- System according to claim 1, wherein said fluid channels (70) in said panel-like copper body are cast fluid channels.
- System according to claim 1, wherein said fluid channels (70) in said panel-like copper body are drilled fluid channels.
- System according to claim 3, wherein plugs are arranged in the end portions of said drilled fluid channels.
- System according to any of claims 1 to 4, wherein said heated panel (52) has a shape corresponding to the shape of said discharge channel (36), wherein said panel-like copper body (66) is formed into said shaped heated panel (52) after formation of said fluid channels (70) therein.
- System according to any of claims 1 to 5, wherein said heated panel (52) comprises a connection element (76) for connecting said heated panel (52) to said protection ring (50).
- System according to claim 6, wherein a wear resistant copper alloy is arranged on a lower portion of a front face of the heated panel (52) and on a front face of the connection element (76).
- System according to any of claims 1 to 7, wherein said fluid channels comprise a fluid inlet (72) and a fluid outlet (74), said fluid inlet and outlet (72, 74) being connected to a fluid circuit for delivering a hot fluid to said heated panel (52).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LU91513A LU91513B1 (en) | 2009-01-15 | 2009-01-15 | Shaft furnace charging installation |
PCT/EP2010/050461 WO2010081879A1 (en) | 2009-01-15 | 2010-01-15 | Shaft furnace charging installation |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2387620A1 EP2387620A1 (en) | 2011-11-23 |
EP2387620B1 true EP2387620B1 (en) | 2013-09-04 |
Family
ID=40801932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10700743.7A Not-in-force EP2387620B1 (en) | 2009-01-15 | 2010-01-15 | Shaft furnace charging installation |
Country Status (9)
Country | Link |
---|---|
US (1) | US20110271884A1 (en) |
EP (1) | EP2387620B1 (en) |
KR (1) | KR20110110157A (en) |
CN (2) | CN201440029U (en) |
BR (1) | BRPI1006860A2 (en) |
CA (1) | CA2746620A1 (en) |
LU (1) | LU91513B1 (en) |
RU (1) | RU2011132472A (en) |
WO (1) | WO2010081879A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107957196B (en) * | 2017-10-31 | 2019-02-15 | 重庆琅博宛冶金材料有限公司 | A kind of smelting furnace facilitating charging |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU59207A1 (en) | 1969-07-31 | 1969-12-10 | Wurth Anciens Ets Paul | |
LU64909A1 (en) | 1972-03-06 | 1972-07-06 | ||
JPS63128107A (en) * | 1986-11-18 | 1988-05-31 | Kobe Steel Ltd | Method for preventing leakage from lower part sealed valve for bell-less in blast furnace |
JPH01149910A (en) * | 1987-12-04 | 1989-06-13 | Nkk Corp | Treating method for preventing corrosion of steam heater |
JP3911362B2 (en) * | 1999-04-28 | 2007-05-09 | 東鉄工株式会社 | Blast furnace raw material charging equipment |
LU91113B1 (en) * | 2004-10-18 | 2006-04-19 | Wurth Paul Sa | Method and device for calibrating a weighing system of a hopper |
EP1811045A1 (en) * | 2006-01-20 | 2007-07-25 | Paul Wurth S.A. | Multiple hopper charging installation for a shaft furnace |
-
2009
- 2009-01-15 LU LU91513A patent/LU91513B1/en active
- 2009-04-30 CN CN2009201504359U patent/CN201440029U/en not_active Expired - Fee Related
-
2010
- 2010-01-15 CA CA2746620A patent/CA2746620A1/en not_active Abandoned
- 2010-01-15 BR BRPI1006860A patent/BRPI1006860A2/en not_active IP Right Cessation
- 2010-01-15 KR KR1020117015837A patent/KR20110110157A/en not_active Application Discontinuation
- 2010-01-15 EP EP10700743.7A patent/EP2387620B1/en not_active Not-in-force
- 2010-01-15 US US13/144,396 patent/US20110271884A1/en not_active Abandoned
- 2010-01-15 RU RU2011132472/02A patent/RU2011132472A/en not_active Application Discontinuation
- 2010-01-15 CN CN2010800037487A patent/CN102264918A/en active Pending
- 2010-01-15 WO PCT/EP2010/050461 patent/WO2010081879A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
RU2011132472A (en) | 2013-02-10 |
WO2010081879A1 (en) | 2010-07-22 |
US20110271884A1 (en) | 2011-11-10 |
LU91513B1 (en) | 2010-07-16 |
BRPI1006860A2 (en) | 2016-03-15 |
EP2387620A1 (en) | 2011-11-23 |
KR20110110157A (en) | 2011-10-06 |
CA2746620A1 (en) | 2010-07-22 |
CN102264918A (en) | 2011-11-30 |
CN201440029U (en) | 2010-04-21 |
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