Classifications

• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B7/00—Blast furnaces
  • C21B7/10—Cooling; Devices therefor
• • 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 specially adapted for furnaces of these types
  • F27B1/24—Cooling arrangements
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
  • F28F3/12—Elements constructed in the shape of a hollow panel, e.g. with channels
• • 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
  • F27D9/00—Cooling of furnaces or of charges therein
  • F27D2009/0002—Cooling of furnaces
  • F27D2009/0045—Cooling of furnaces the cooling medium passing a block, e.g. metallic

Definitions

• the invention relates to a cooling plate for shaft furnaces provided with a refractory lining, with at least one coolant duct and with pipe sections for the coolant inlet or outlet, the respective coolant duct being delimited on the one hand by a coolant duct cutout in the cooling plate itself and on the other hand by a second part.
• a generic cooling plate is known from EP 0 930 371 A1. This discloses a cooling plate for shaft furnaces provided with a refractory lining, cooling channels being provided on the rear side of the cooling plate, some of which are delimited by the cooling plate itself and partly by sheets, the cooling channels being milled into the rear of the cooling plate and / or are introduced into the metal sheets.
• the cooling channels can be closed by individual sheets or an entire plate. The sheets or plate are attached to the back of the cooling plate by welding or screwing.
• DE 40 35 893 C1 describes a cooling box made of copper for cooling, in particular, blast furnace walls.
• This has a plate-shaped base body which is provided with at least one coolant groove having an inlet and an outlet.
• the coolant grooves are closed by means of a cover plate welded onto the base body to form a coolant channel.
• the base body is covered with a cover plate on the side of the slot openings and the cover plate is welded to the base body explosively, ie by being blown open.
• inserts preferably made of copper, are introduced into the slot openings and are welded to the base body and the cover plate.
• a cooling channel is formed in the back of a base plate by covering it with a cover plate which is attached to the back itself.
• the invention has for its object to provide a generic cooling plate with improved manufacturing and cooling properties.
• the second part which delimits the coolant channel at the rear, is arranged as a cover plate sunk into the coolant channel cutout formed by the cooling plate itself.
• the essence of the invention is therefore no longer to arrange the cover plate on the actual rear wall of the cooling plate or base plate by spanning the coolant channel cutout, but rather that it is sunk or immersed directly in the coolant channel cutout.
• the cover plate is then encompassed by projecting webs of the coolant channel cutout. It is advisable to arrange the cover plate so that its back is flush with the back of the cooling plate.
• the rear outer surfaces of the projecting webs of the coolant channel cutout and the rear outer surface of the cover plate consequently form a flat surface. This has advantages, for example, during assembly, especially when backfilling with refractory material.
• the cover plate is preferably welded to both longitudinal edges along the - coolant-side - inner surfaces of the projecting webs of the coolant channel section of the cooling plate. This arrangement of the weld seams results in improved weld seam designs.
• the thickness and the shape of the cover plate on the cooling water side determine the remaining cross-section and the cross-sectional profile of the respective coolant. telkanals determined.
• the cover plate is preferably designed or arranged in such a way that it projects into the coolant channel to such an extent that the resulting coolant channel runs approximately centrally to the overall cooling plate. Due to the shift of the coolant channel towards the center of the cooling plate, the cooling properties are improved.
• the cover plate has a flat surface on the coolant side, and according to a second embodiment a single or multiple trough-shaped surface on the coolant side.
• the coolant channel cutout in the cooling plate is preferably single or multiple trough-shaped.
• the total cross section of the coolant channel results from any combination of the cross section of the coolant channel cutout in the cooling plate and a flat or shaped cover plate.
• the cross-sectional area of the coolant channel with respect to the longitudinal extent of the cross section is larger in the end regions than in the central region. If the end regions are half-arched or fully arched, the cross-sectional shape of a half-bone or a full bone results approximately.
• the cooling plate and / or the cover plate are advantageously made from a rolled or forged raw block of copper or a - low-alloy - copper alloy.
• the production from copper casting or copper alloy casting is also proposed, for example by continuous casting or sand molding processes.
• the cooling plate and / or the cover plate are made from rolled or forged steel or from cast steel or from special gray cast iron, which in particular reduces the material costs. It is also advisable to combine a copper cooling plate with a steel cover plate.
• Fig. 1 shows a section of a cross section of a cooling plate according to a first
• Fig. 2 shows a detail of a cross section of a cooling plate after a second
• FIG. 3 shows a detail of a cross section of a cooling plate according to a third
• Fig. 4 shows a longitudinal section through a cooling plate installed in a furnace wall of a blast furnace.
• FIG. 1 shows a section of a cross section through a cooling plate 1 or a stave with a plurality of coolant channels, only one coolant channel 2 being shown here by way of example.
• This channel 2 through which a coolant such as water flows, is delimited on the one hand by a cutout 3 or a depression in the cooling plate 1 itself and on the other hand by a cover plate 4 as a second part.
• This cover plate 4 is in this case arranged recessed into the coolant channel cutout 3 in such a way that its rear side 5 is flush with the rear side 6 of the cooling plate 1.
• cutouts 3 or depressions are made in the cooling plate 1, starting from its rear side 6 or cold side, for example by milling.
• the respective cutouts 3 are surrounded by projecting webs 7a, b.
• the cover plate 4 is then inserted into the recess until it comes to rest on the step 8a, b.
• the cover plate 4 thus fixed is then welded along its longitudinal edges 9a, b to the inner surfaces 10a, b of the webs 7a, b. For this are the Long edges 9a, b of the cover plate to ensure optimal weld seams 11a, b.
• connection is made by multi-layer welding, for example by MSG (metal shielding gas welding) or electric welding.
• MSG metal shielding gas welding
• the cover plate 3 in the embodiment shown is provided with a flat surface 12 on the water side, while the cutout 3 of the cooling plate 1 is trough-shaped. The result is approximately a semi-oval cooling channel cross section.
• the hot side 13 of the cooling plate 1 facing the furnace interior is provided with grooves 14 for receiving refractory material 23.
• FIG. 2 A second embodiment of a cooling plate 101 is shown in FIG. 2.
• the water side 112 of the cover plate 104 is no longer flat, but also has a trough-shaped or oval design.
• the overall result is an approximately oval cross section of the cooling channel 102 with favorable fluidic properties.
• the fluidic properties are further improved by providing the cooling plate 201 with a double trough-shaped cutout 203 or a recess, preferably by milling or profile rolling.
• the troughs 214a, b are designed here as bulges.
• a cover plate 204 with a flat water-side surface 212 roughly results in the shape of half a bone for the cooling channel 202. It is also advisable to provide the water-side surface 212 of the cover plate 204 with a complementary, double-trough-shaped depression that the overall cross-sectional shape of a bone would result.
• a half- or full-bone cross-section means that most of the cooling water no longer flows in the central region 215, but rather in the heat-stressed end regions or troughs 214a, b of the cooling channel 202, it being possible to achieve higher flow velocities and thus more favorable heat transfer coefficient values .
• the cross-section in the central area 215 is to be designed in such a ratio that the heat generated there, which is less, can be dissipated well.
• Such cooling plates 1, 101, 201 or staves made of copper or steel have tube sections 16, 17 for the coolant inlet and coolant outlet.
• pipe sections can be located at the ends of the respective coolant channels or also at closed ends of the coolant channels in bores in the cover plate, the pipe sections 16, 17 extending through bores 18, 19 in the furnace wall 20 (cf. FIG. 4) ,
• the cooling plate 1 is connected to the furnace wall 20 by means of screws 21, 22.
• Other connections are also conceivable, such as a connection via a web holder.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Metallurgy (AREA)
• Manufacturing & Machinery (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Furnace Housings, Linings, Walls, And Ceilings (AREA)
• Blast Furnaces (AREA)
• Crystals, And After-Treatments Of Crystals (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=7682906

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (8)

Family Cites Families (2)

• 2001
  • 2001-04-26 DE DE10120614A patent/DE10120614A1/de not_active Ceased
• 2002
  • 2002-03-21 EP EP02724252A patent/EP1381699B1/fr not_active Expired - Lifetime
  • 2002-03-21 DE DE50202280T patent/DE50202280D1/de not_active Expired - Fee Related
  • 2002-03-21 WO PCT/EP2002/003142 patent/WO2002088398A1/fr not_active Ceased
  • 2002-03-21 AT AT02724252T patent/ATE289359T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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