WO2002027042A1 - Verfahren zum kühlen eines hochofens mit kühlplatten - Google Patents
Verfahren zum kühlen eines hochofens mit kühlplatten Download PDFInfo
- Publication number
- WO2002027042A1 WO2002027042A1 PCT/EP2001/011117 EP0111117W WO0227042A1 WO 2002027042 A1 WO2002027042 A1 WO 2002027042A1 EP 0111117 W EP0111117 W EP 0111117W WO 0227042 A1 WO0227042 A1 WO 0227042A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cooling
- channel
- plate body
- cooling channel
- longitudinal axis
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/10—Cooling; Devices therefor
Definitions
- the present invention relates to a method for cooling a blast furnace with cooling plates, also called staves.
- the furnace wall cooling consists of so-called staves, which line the furnace shell towards the inside of the furnace.
- stave is a cooling plate which comprises a rectangular, solid plate body in which several vertical cooling channels are integrated.
- the solid plate body can be made of cast iron (in particular GGG, ie cast iron with spheroidal graphite) or of copper or a copper alloy.
- the cooling channels are mostly formed by cast-in, U-shaped steel tubes, the ends of the tube being led out of the rear of the plate body as connecting pieces of the cooling channel.
- the cooling channels are drilled, for example, in the plate body.
- connection bores per cooling channel are then drilled from the back of the copper plate body, which open centrally into the upper or lower end of the cooling channel. Pipe sockets are then soldered or welded into these connection bores as connection sockets.
- the cooling plates are integrated into a water cooling circuit of the blast furnace via their connecting pieces. Several cooling plates are cool . connected in series on the cooling water side.
- WO 00/36154 has solved the problem of reducing the flow losses in copper cooling plates with cast-in or drilled cooling channels. This is achieved in that a shaped piece is inserted into a recess in the cooling plate body and forms a flow-optimized deflection channel for the cooling medium.
- Such a steam film indeed has a very high heat transfer resistance, so that the cooling of the plate body in the area of the steam film is greatly impaired and local overheating of the plate body can occur.
- relatively high flow velocities ie 1.5 to 2.0 m / s
- small temperature differences in the cooling water between the inlet and outlet usually 3 ° C to 5 ° C.
- DE 29721941 U1 describes, for example, a coolant line integrated into the wall of an electric furnace, which contains baffles in the interior of the line for generating local turbulence and / or increasing the flow rate. This should continuously break down any vapor layer that may form.
- DE 29721941 U1 assumes a flow velocity of 4 m / s without internals and less than 3 m / s, or 2.5 m / s with internals, which of course are still significantly higher flow velocities than in the Cooling channels of the Staves are available.
- US 4,210,101 deals with the cooling of a blast furnace by means of so-called cooling boxes. Unlike Staves, these are cool boxes Hollow body with a real cooling chamber.
- US 4,210,101 proposes to create a spiral movement of the cooling water by means of internals in this cooling chamber. This is intended to improve the cooling of the cooling box.
- cooling boxes are not used today to cool modern blast furnaces, but mainly copper and cast iron staves.
- the SU 386 993 from 1970 relates to a blast furnace cooler with a cast housing that contains a cooling coil.
- the cooling coil has a cooling water inlet and a cooling water return.
- a spiral membrane is built into the cooling water inlet, which creates a vortex and creates a turbulent flow in the cooling coil, so that better cooling performance is achieved. Blast furnace coolers of this type could not prevail.
- SU 439 678 from 1971 relates to a tubular cooler for metallurgical furnaces.
- Baffles in the interior of the cooler are intended to generate a turbulent flow by swirling, as a result of which the heat transfer coefficient between the cooling element and the cooling medium increases.
- the LU 88010 relates to a wall cooler made of pipes for an electric arc furnace.
- Parallel pipe segments are connected by means of short pipe sections, which discharge the cooling liquid tangentially from one pipe segment and in turn feed it tangentially into the next pipe segment. This creates a spiral cooling flow in the parallel pipe segments, which should increase the cooling capacity of the wall cooler.
- An object of the present invention is to propose a method for cooling a blast furnace with Staves, which enables both the Reduce investment costs as well as the operating costs for the water cooling circuit without losing safety. This object is achieved by a method according to claim 1.
- the cooling water throughput is reduced in such a way that the average flow rate of the cooling water in the direction of the longitudinal axis of the cooling channel is less than 1.0 m / s, even less than 0.5 m / s can be.
- the rule for the person skilled in the art was that the cooling water throughput in the cooling channels of the staves is fixed in such a way that an average flow rate of the cooling water of at least 1.5 m / s is ensured.
- a swirling device is connected upstream of the cooling channels with the reduced flow rate in such a way that it produces a helical flow of the cooling liquid around the longitudinal axis of the cooling channel.
- the flow rate of the cooling liquid accordingly has an axial and a peripheral component in the cooling channel.
- the axial component determines the flow in the cooling channel.
- the peripheral component has no influence on the flow in the cooling channel. It thus enables the flow rate of the cooling liquid in the vicinity of the wall of the cooling channel to be increased without increasing the flow of the cooling liquid in the cooling channel. This makes it possible to ensure the required security against vapor film formation and still keep the flow of the coolant in the cooling channel small. Smaller quantities of cooling water make the cooling circuit cheaper due to smaller pipe cross-sections, small circulation pumps and smaller recooling systems.
- the additional vortex devices cause the cooling plates to become slightly more expensive, but this price increase is significantly lower than the savings mentioned above.
- the method according to the invention also causes lower operating costs, in particular by saving energy costs for the circulation.
- the additional vortex devices cause an additional pressure loss in the cooling plates, the latter is largely compensated for by the fact that the amounts of water circulated in the blast furnace cooling circuit are greatly reduced according to the invention become.
- the lower cooling water throughput results in a larger temperature difference between the return flow and the cooling water supply. In this way, a better efficiency of the recooling is achieved. In areas of the furnace that are less thermally stressed
- Cooling plates are used without a vortex device, the cooling water throughput then being designed such that the average flow rate of the cooling water in the direction of the longitudinal axis of the cooling channel is at least 1.5 m / s.
- These cooling plates without a vortex device are then advantageously subjected to the cooling water which has already warmed up in the cooling plates with a vortex device.
- a cooling duct with a vortex device of a first cooling plate is connected in series with a cooling duct without a vortex device of a second cooling plate.
- the cross section of the cooling channel without a swirl device can be reduced in a ring shape by a central displacement body, so that, with the same cooling water throughput, the average flow rate of the cooling water in the direction of the longitudinal axis of the cooling channel is less than 1.0 m / s in the cooling channel with swirl device and at least 1 .5 m / s in the cooling channel with displacement body.
- the swirling device comprises an inlet connection which tangentially entrains the cooling liquid inside the plate body
- Cooling channel initiates.
- the longitudinal axis of the cooling channel is thus generated directly at the beginning of the cooling channel.
- the vortex device can also introduce the cooling liquid tangentially outside the plate body into a connecting piece which is led out of the plate body.
- the cooling channel normally has a smooth surface to the cooling liquid.
- the cooling channel like a cannon barrel, can also have a surface with helical cables.
- at least one axial can also be placed in the cooling channel Integrate swirl bodies.
- the cooling channel can also have a central displacement body, so that an annular channel for the cooling liquid is formed in the cooling channel.
- the central displacement body With the same heat exchange surface to the cooling water (i.e. the same diameter of the cooling channel) and the same flow rate, the central displacement body increases the axial flow rate of the cooling liquid in the cooling channel and thus also increases the security against vapor film formation. In other words, through the central displacement body, one can work with a lower cooling water flow without having to accept a greater risk that the cooling plate will overheat due to local vapor film formation.
- FIG. 1 shows a longitudinal section through a first cooling plate with a vortex device
- FIG. 2 shows a section along the section line 2'-2 "of FIG. 1 through the vortex device of FIG. 1;
- FIG. 3 shows a cross section through a first embodiment of a cooling channel with a central displacement body
- FIG. 4 shows a cross section through a second embodiment of a cooling duct with a central displacement body; 5 shows a longitudinal section through a second cooling plate with a vortex device; 6 shows a plan view of the vortex device of FIG. 5;
- FIG. 8 shows a cross section through a first embodiment of a cooling duct with a central displacement body
- 9 shows a cross section through a second embodiment of a cooling duct with a central displacement body
- 10 a three-dimensional section of a third embodiment of a
- FIG. H a three-dimensional section of a further embodiment of a cooling plate with vortex devices.
- FIGS 1, 5, 7, 10 and 11 show cooling plates 10, 110, 210, 310, 410, also called staves, as they are used in blast furnaces. This
- Cooling plates 10, 110, 210, 310, 410 are attached to the inside of the blast furnace and can be lined with a refractory material towards the inside of the furnace.
- the cooling plate 10 shown in FIG. 1 comprises an essentially rectangular plate body 12 made of low-alloy copper, the front side 14 of which is provided with ribs 16 in order to achieve a better connection with the refractory material.
- a smooth back 18 of the plate body 12 is facing the furnace shell.
- This rear side 18, or the entire plate body 12, can have a curvature which is adapted to the curvature of the furnace shell.
- a cooling channel 20 is shown in longitudinal section.
- the plate body 12 is traversed by a plurality of such cooling channels, which run essentially parallel to one another. It should be noted that the cooling channel 20 is closed at both ends in the axial direction.
- Such a plate body 12 can, for example, advantageously be produced according to the method described in WO 98/30345 by continuously casting a preform of the plate body with through-channels. However, it can also be produced by the process described in US 4382585, the Cooling channels are drilled in a forged or rolled copper block.
- the reference number 22 in FIGS. 1 and 2 designates globally a vortex device which is connected upstream of the cooling channel 20.
- This vortex device 22 comprises a funnel-shaped inlet connector 26 which is welded or soldered into a milled slot in the rear side 18 of the plate body 12.
- This funnel-shaped inlet connector 26 forms a tapering inlet channel 30 with a rectangular cross section, which opens tangentially into the cooling channel 20 in the plate body.
- the height "h" of the inlet channel 30 at the junction with the cooling channel 20 is less than half the diameter of the cooling channel 20.
- the width "b" of the inlet channel 30 is approximately twice the diameter of the cooling channel 20 (see FIG. 1 ).
- the angle " ⁇ " between the two planes 32, 34, which form the tapering inlet duct 30, is approximately 18 ° in the embodiment shown. Due to the tangential entry of the cooling liquid into the cooling duct 20, the cooling liquid experiences an initial acceleration, so that in the Cooling channel 20 results in a helical flow around the longitudinal axis X of the cooling channel 20.
- the reference numeral 40 denotes an outlet connection in FIG. 1, which discharges the cooling liquid from the cooling channel 20.
- this outlet connector 40 is designed similarly to the inlet connector 26 already described, that is to say that the cooling liquid is in turn also discharged tangentially from the cooling channel 20.
- the tangential exit of the cooling liquid from the cooling channel 20 makes a significantly smaller contribution to the development of a helical flow of the cooling liquid around the longitudinal axis X of the cooling channel 20 than the tangential entry into the cooling channel 20. In most cases, therefore, tangential exit of the cooling liquid from the cooling channel 20 can be dispensed with.
- a cylindrical outlet connection can then open centrally into the cooling channel 20 in a known manner.
- the cooling plate 10 can have a significantly lower cooling water flow than known cooling plates, without taking a greater risk that the cooling plate 10 overheats due to local vapor film formation.
- a central displacement body 42 can be arranged in the cooling channel 20, so that only an annular channel 44 for the cooling liquid remains in the cooling channel 20. With the same flow rate, the central displacement body 42 increases the axial flow rate of the cooling liquid in the cooling channel 20 and thus also increases the security against vapor film formation. In other words, you can work with a lower cooling water flow without having to accept a greater risk that the cooling plate will overheat due to local vapor film formation.
- 4 shows a cooling channel 20 'with an oval cross section and a central displacement body 42', which also has an oval cross section. Note that the oval cross-section causes larger flow losses, but has the clear advantage that the heat exchange surface to the coolant can be increased without the thickness of the plate body 12 having to be increased.
- Such displacement bodies 42, 42 ' which have essentially the same length as the cooling channel 20, 20', are, for example, inserted axially into the cooling channel 20, 20 'before the latter is closed axially.
- Spacers 46, 46 ' which are arranged at certain intervals along the displacement body 42, 42', in this case center the displacement body 42, 42 'on the longitudinal axis X of the cooling channel 20, 20'.
- At least one axial swirl body can be integrated into the cooling duct 20, which swirls the helical flow of the cooling liquid around the Longitudinal axis X of the cooling channel 20 supports.
- the cooling channel 20 can also have a surface with screw-shaped trains (not shown) which also supports a screw-shaped flow of the cooling liquid around the longitudinal axis X of the cooling channel 20.
- Such helical cables can also be incorporated in the surface of the displacement bodies 42, 42 '.
- the cooling plate 110 shown in FIG. 5 comprises an essentially rectangular plate body 112 made of GGG (ie cast iron with spheroidal graphite), which is crossed by a plurality of parallel cooling channels.
- a cooling channel 120 is formed by a U-shaped tube 121, which is cast into the plate body 112.
- the two ends of the tube 121 are led out of the plate body 112 as connecting pieces 123, 125 of the cooling channel 120.
- the reference numeral 122 designates globally a swirling device 122, which introduces the cooling liquid tangentially into the connecting piece 123 outside the plate body 112.
- the vortex device 122 also comprises a funnel-shaped inlet connector 126.
- Fig. 7 also shows a cooling plate 210, which is also made of cast iron. This cooling plate 210 differs from the cooling plate 110 mainly in that the swirling device 122 is replaced by a central displacement body 242 (see also FIG. 8).
- This central displacement body 242 leaves only an annular channel 244 for the cooling liquid in the cooling channel 220.
- the central displacement body 242 increases the axial flow rate of the cooling liquid in the cooling channel 220 and thus also increases the security against vapor film formation.
- the central displacer 242 allows one to work with a lower cooling water flow without having to accept a greater risk that the cooling plate 210 will overheat due to local vapor film formation.
- the displacer 242 is e.g. inserted into the tube 221 before the latter is bent.
- the ring channel 244 can be filled with sand, which is removed again after the bending ,
- FIG. 9 shows that a tube 221 'with a flattened cross section can also be cast into the plate body.
- a flattened cross-section has the advantage that the heat exchange surface for the cooling liquid can be increased without the thickness of the plate body having to be increased.
- FIG. 9 also shows that a displacement body 242 'with an oval cross section can be integrated into the tube 221' with an oval cross section.
- FIG. 10 shows a further embodiment of a copper cooling plate 310 in Cooling water inlet area.
- the vortex device is formed by a prefabricated, solid shaped piece 322.
- the latter is a solid casting that forms an arcuate transition channel 330 with molded, helical cables 331.
- the latter produce a helical flow of the cooling liquid around the longitudinal axis of the cooling channel 320.
- a connection piece 333 can be soldered into the shaped piece 322, welded in or even cast in when the shaped piece 322 is cast.
- a solid base attachment 335 on the shaped piece 322 facilitates a secure attachment of the connecting piece 333 and also serves as a spacer for the cooling plate 310 when mounting on the furnace wall.
- the recess for the shaped piece 322 is advantageously milled into the copper cooling plate body 312 from the rear, the recess opening into an end face 337 of the cooling plate body 312 and the depth of the recess being smaller than the thickness of the cooling plate body 312.
- the interface between the cooling plate body 312 and the shaped piece 322 is welded or soldered all around on the surface. Due to the relatively simple shape of this interface, this welding or soldering work can be carried out quickly and safely. It should be noted that in the embodiment according to FIG. 10, the connecting piece 333 and the cooling channel 320 in the cooling plate body 312 each have the same cross section.
- the cooling channel 420 in the copper cooling plate body 412 has an oval cross section, whereas the
- Connection piece 433 has a circular cross section.
- copper cooling plates 10, 310, 410 with vortex direction used particularly advantageously in the thermally highly stressed area of the coal sack and the lower shaft.
- Cast-iron cooling plates 110, 210 with a swirl device and / or displacement body are used particularly advantageously in the area of the upper shaft.
- the flow of the cooling water in the cooling channels of the cooling plates is advantageously determined in such a way that: in the cooling channels with a swirl device, the average flow rate of the cooling water in the direction of the longitudinal axis of the cooling channel is advantageously less than 1.0 m / s, or even less than 0, 5 m / s; and
- the average flow rate of the cooling water in the direction of the longitudinal axis of the cooling channel is advantageously greater than 1.5 m / s or even greater than 2.0 m / s; this speed can be achieved by an inserted displacement body.
- cooling plates presented can of course not only be used in blast furnaces and other shaft furnaces, but also in crucible furnaces.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE50102007T DE50102007D1 (de) | 2000-09-26 | 2001-09-26 | Verfahren zum kühlen eines hochofens mit kühlplatten |
AT01972081T ATE264403T1 (de) | 2000-09-26 | 2001-09-26 | Verfahren zum kühlen eines hochofens mit kühlplatten |
AU2001291880A AU2001291880A1 (en) | 2000-09-26 | 2001-09-26 | Method for cooling a blast furnace with cooling plates |
EP01972081A EP1322791B1 (de) | 2000-09-26 | 2001-09-26 | Verfahren zum kühlen eines hochofens mit kühlplatten |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LU90644A LU90644B1 (de) | 2000-09-26 | 2000-09-26 | Ofenwandkuehlung mit Kuehlplatten |
LU90644 | 2000-09-26 | ||
LU90743 | 2001-03-19 | ||
LU90743 | 2001-03-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002027042A1 true WO2002027042A1 (de) | 2002-04-04 |
Family
ID=26640376
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/011117 WO2002027042A1 (de) | 2000-09-26 | 2001-09-26 | Verfahren zum kühlen eines hochofens mit kühlplatten |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1322791B1 (de) |
AT (1) | ATE264403T1 (de) |
AU (1) | AU2001291880A1 (de) |
DE (1) | DE50102007D1 (de) |
WO (1) | WO2002027042A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10323944A1 (de) * | 2003-05-27 | 2004-12-16 | Maerz Ofenbau Ag | Prozessbehälter mit Kühlelementen |
US7215441B2 (en) | 2001-01-17 | 2007-05-08 | Silverbrook Research Pty Ltd | Digital photo album with image enhancement and internal printer |
CN111424125A (zh) * | 2020-05-15 | 2020-07-17 | 马鞍山市润通重工科技有限公司 | 均匀布置冷却水管槽的铸钢冷却壁及其加工工艺 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1122222B (de) * | 1953-05-23 | 1962-01-18 | Ernst R Becker Dipl Ing | Anwendung der fuer metallurgische OEfen bekannten Verdampfungskuehlung unter Hochdruckdampfbildung |
SU386993A1 (ru) * | 1970-12-14 | 1973-06-21 | Холодильник доменной печи | |
SU439678A1 (ru) * | 1971-09-22 | 1974-08-15 | Трубачатый холодильник дл металлургических печей | |
US4210101A (en) * | 1977-05-25 | 1980-07-01 | Francois Touze | Heat exchange devices for cooling the wall and refractory of a blast furnace |
US4410999A (en) * | 1980-07-19 | 1983-10-18 | Korf And Fuchs Systemtechnik | Method and apparatus for cooling a wall region of a metallurgical furnace, in particular an electric arc furnace |
DE19755225A1 (de) * | 1997-12-12 | 1999-06-24 | Vom Bovert & Co Schweistechnik | Kühlmittelleitung für Elektrolichtbogenöfen |
WO2000036154A1 (de) * | 1998-12-16 | 2000-06-22 | Paul Wurth S.A. | Kühlplatte für einen ofen zur eisen- oder stahlerzeugung |
US6090342A (en) * | 1998-02-13 | 2000-07-18 | Nkk Corporation | Stave for metallurgical furnace |
-
2001
- 2001-09-26 AT AT01972081T patent/ATE264403T1/de active
- 2001-09-26 EP EP01972081A patent/EP1322791B1/de not_active Expired - Lifetime
- 2001-09-26 DE DE50102007T patent/DE50102007D1/de not_active Expired - Lifetime
- 2001-09-26 AU AU2001291880A patent/AU2001291880A1/en not_active Abandoned
- 2001-09-26 WO PCT/EP2001/011117 patent/WO2002027042A1/de active IP Right Grant
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1122222B (de) * | 1953-05-23 | 1962-01-18 | Ernst R Becker Dipl Ing | Anwendung der fuer metallurgische OEfen bekannten Verdampfungskuehlung unter Hochdruckdampfbildung |
SU386993A1 (ru) * | 1970-12-14 | 1973-06-21 | Холодильник доменной печи | |
SU439678A1 (ru) * | 1971-09-22 | 1974-08-15 | Трубачатый холодильник дл металлургических печей | |
US4210101A (en) * | 1977-05-25 | 1980-07-01 | Francois Touze | Heat exchange devices for cooling the wall and refractory of a blast furnace |
US4410999A (en) * | 1980-07-19 | 1983-10-18 | Korf And Fuchs Systemtechnik | Method and apparatus for cooling a wall region of a metallurgical furnace, in particular an electric arc furnace |
DE19755225A1 (de) * | 1997-12-12 | 1999-06-24 | Vom Bovert & Co Schweistechnik | Kühlmittelleitung für Elektrolichtbogenöfen |
US6090342A (en) * | 1998-02-13 | 2000-07-18 | Nkk Corporation | Stave for metallurgical furnace |
WO2000036154A1 (de) * | 1998-12-16 | 2000-06-22 | Paul Wurth S.A. | Kühlplatte für einen ofen zur eisen- oder stahlerzeugung |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Section Ch Week 197409, Derwent World Patents Index; Class M24, AN 1974-17053V, XP002169745 * |
DATABASE WPI Section Ch Week 197547, Derwent World Patents Index; Class M24, AN 1975-78145W, XP002169746 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7215441B2 (en) | 2001-01-17 | 2007-05-08 | Silverbrook Research Pty Ltd | Digital photo album with image enhancement and internal printer |
DE10323944A1 (de) * | 2003-05-27 | 2004-12-16 | Maerz Ofenbau Ag | Prozessbehälter mit Kühlelementen |
CN111424125A (zh) * | 2020-05-15 | 2020-07-17 | 马鞍山市润通重工科技有限公司 | 均匀布置冷却水管槽的铸钢冷却壁及其加工工艺 |
Also Published As
Publication number | Publication date |
---|---|
DE50102007D1 (de) | 2004-05-19 |
EP1322791B1 (de) | 2004-04-14 |
AU2001291880A1 (en) | 2002-04-08 |
ATE264403T1 (de) | 2004-04-15 |
EP1322791A1 (de) | 2003-07-02 |
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