KR20030083008A - Cooling plate - Google Patents

Abstract

The present invention provides the first rolling cold plate members 2 and 102 and the second rear rolling cold plate members 3 and 103, the first cooling plate member and the second cooling plate member, which face toward the furnace interior Oi, which are welded to each other. The invention relates to a furnace refrigeration plate (1, 101) with a refractory lining, having a cooling channel (7, 107) in between, and a tube section (8, 9) for inlet or outlet of coolant. It is to provide such a cooling plate exhibiting improved manufacturing techniques, flow techniques, and cooling technical characteristics. To this end, the first cooling plate members 2, 102 are formed as a bloom with a flat front face 14 facing the furnace interior Oi, the cross section of the cooling channel being based on the longitudinal extension of the cross section. Larger in the end zones 18, 19; 118, 119 than in the central zone 20; 120. In addition, the present invention relates to a cooling system 33.

Description

Cooling Plate {COOLING PLATE}

Cooling plates according to the presupposed type are described in German patent application 100 00 987.5. The patent application discloses a refrigeration plate for a furnace with a refractory lining having a cooling channel into which a coolant can be propelled, wherein at least one front face toward the inside of the furnace has a groove for receiving the refractory material. Preferably made of copper or a low alloy copper alloy, two trough rolled steel profiles are welded to each other outwardly by their traps and connected to the back rolled steel profile or the supplementary profile. A hole is provided to receive the end of the connecting piece so that the pipe connecting piece is welded thereto, and the free end of the rolled steel profile is closed to the cap.

Bending the first cooling plate member or shield and providing grooves in the bent shield are complex manufacturing techniques. In addition, the approximately " lensoidal " cross section of the cooling channel caused by the trap shape of the two cooling plate members has proven to be poor in flow technology. While the amount of heat flowing from the lateral fins of the shield toward the coolant channel is greatest, the coolant flow rate is none other than the lowest at the corner of the "lens". Such a low flow rate results in a low heat transfer coefficient from the inner surface of the cooling channel to the cooling water. In addition, in some cases, the amount of water flowing along the side is heated to an unacceptable amount.

The present invention relates to a first rolled cold plate member and a second rear rolled cold plate member, a cooling channel formed between the first cold plate member and the second cold plate member, and a pipe for inlet or outlet of the coolant toward the inside of the furnace welded to each other. It relates to a furnace, in particular a cooling plate for a blast furnace, provided with a fireproof lining having a section. In such cooling plates, the first and second cooling plate members are made of copper or low alloy copper alloys. The invention also relates to a cooling system.

1 is a cross sectional view of a cooling plate according to the first embodiment;

2 is a cross sectional view of a cooling plate according to the second embodiment;

3 shows a second cooling plate member according to FIG. 2, which is preferably formed;

4 is a longitudinal sectional view of the cooling plate assembled to the furnace wall;

5 is a partial longitudinal cross-sectional view of the first cooling plate member according to FIG. 1, which is preferably formed;

6 is a side view of a cooling plate with a preferably formed first cooling plate member;

7 is a partial view of a cooling system assembled to a furnace wall;

8 is a longitudinal sectional view along line A-A of the cooling plate according to FIG. 7;

9 is an enlarged view of the upper portion shown in FIG. 8;

FIG. 10 is an enlarged view of the lower part shown in FIG. 8.

It is therefore an object of the present invention to provide a cooling plate according to the presupposed type in which the manufacturing technical characteristics, the flow technical characteristics, and the cooling technical characteristics are improved.

Such an object is achieved by a cooling plate having the features of claim 1 and a cooling system having the features of claim 12. Preferred additional configurations are described in the dependent claims.

According to the core idea of the present invention, the shield of the first cooling plate member or the cooling plate or the plate is no longer bent, but is formed as a bloom with a flat front face, ie, a flat high temperature side toward the furnace interior, The cross section of the cooling channel which occurs between the first and second cooling plate members is larger in the end zone than in the central zone when viewed on the basis of the longitudinal extension of the cross section. The end region of the cross section of the cooling channel is the region near the joining line or weld seam of the two cooling plate members. Such end zone may take any form as long as it has a larger cross section than the central zone. Such cross-sectional shapes in accordance with the present invention allow a greater flow rate and hence better heat transfer coefficient values to be obtained as most of the coolant no longer flows to the central zone but to the end zone under load. In that case, the cross section in the central zone is relatively designed so that the amount of heat generated therein can be well taken out.

In this way, a cooling plate is provided in which the flow characteristics of the cooling water as a whole are improved and thus the cooling characteristics are improved. On the high temperature side, that is, toward the inside of the furnace, leveling of the temperature is realized. Further, therefrom, the manufacturing technology has a significant advantage that the first cooling plate member is formed flat and no longer needs to be bent. In addition, providing a groove in the flat cooling plate, for example by phrase cutting or profiling rolling, is much simpler than providing it in a curved cooling plate.

According to a very preferred embodiment, half or both end regions of the cooling channel cross section are formed by bending. Considering the central zone, a cooling channel cross section is given which can be roughly comparable to the shape of the bone or the shape of the half bone cut along its longitudinal axis. With such a form, a very good ratio of the coolant flow rate to the heat load generated is obtained.

In order to obtain cooling channels in the form of such bones, various structural combinations are provided. In the case of a cross section in the form of an approximately half-bone, a first cooling plate member with a recess provided on its cooling water side back is used, or a second cooling plate member formed in a double trap shape having an arch facing the furnace wall side is used. . Such a first cooling plate member is combined with a substantially flat second cooling plate member; The trapped second cooling plate member is combined with the first cooling plate member having a flat cooling water side back surface. To obtain a cross section in the form of a bone, a first cooling plate member with a recess is combined with a corresponding second cooling plate member with a recess or with a double trapped second cooling plate member.

The recess, which preferably extends parallel to the longitudinal axis of the cold plate, is provided by profiling rolling or half phrase cutting. The trapped second cooling plate, which is formed thinner than the first cooling plate, is manufactured by profiling rolling or bending.

The first cooling plate member as well as the second cooling plate member are made of copper or a copper alloy.

According to a preferred embodiment, the trapped second cooling plate member has a different material thickness over its width. It is thicker at the edges than at its central zone. This gives the advantage that more copper material is provided in the zone where the heat flow is strong, ie the edge zone, so that more heat transfer material is available. Based on the thickening of the edge zones, welding seams that join the two members together can also be robustly constructed. It contributes to the mechanical stability of the cooling plate and thus to further improvement of the cooling technical properties.

The second cooling plate member may be welded to the edge of the first cooling plate member, and according to a preferred embodiment the edge of the first cooling plate member by the edge in the longitudinal direction bent toward the back side of the first cooling plate member in terms of the complementary profile. It can be welded to the back side. In order to prevent undulations at the edges of the first cooling plate member due to the non-uniform temperature distribution, the slit is provided at regular intervals perpendicular to the longitudinal axis of the cooling plate in the edge region of the first cooling plate member. Take action.

In a preferred embodiment, the free ends of the two cooling plate members joined to each other are closed with a cap, and the tube section for coolant inlet and outlet protrudes through a hole in the rear side second cooling plate member. In order to lower the coolant side pressure loss in the coolant inlet or outlet zone, the first cooling plate member with a cooling channel recess is formed hollow at the height of the tube section, for example by half-cutting copper. The transition from such enlarged inlet or outlet zones to the cooling channel recesses is accomplished by reducing the depth of the hollow part into a ramp towards the cooling channel recesses. Now, from the round tube section, as proposed in accordance with the present invention, the flexible transition from the larger end section to the smaller cooling channel cross section is why the pressure loss is small.

In addition to the bridge retaining coupling, the cooling plate has at least two suspension points for suspending the cooling plate to the furnace wall of the furnace, wherein the first suspension point is a fixed coupling to the top of the cooling plate, preferably to coolant inlet or outlet. It is formed at the top of the tube section, and the second suspension point is formed at the bottom of the cooling plate as a separate coupling, preferably at the bottom of the tube section for coolant inlet or outlet. By means of a preferred suspending device having such a separation point, which is preferably formed as a U link, the lower part of the cooling plate can be thermally expanded.

Further details and advantages of the invention will be apparent from the following detailed description of embodiments of the invention shown in the dependent claims and the accompanying drawings. In the present invention, in addition to the combination of the above-described features, the singular feature or other combination of the features is also the core of the present invention.

1 shows a cooling plate 1 or a plate having a first cooling plate member 2 and a second rear cooling plate member 3 facing toward the furnace interior Oi, which are welded to each other. The weld seam 4 rests on the cooled low temperature side of the cooling plate or plate. Cooling channel, preferably cooling water, is supplied between the cooling water side back side 5 of the first cooling plate member 2 as the rolled copper bloom and the cooling water side side 6 of the second cooling plate member 3. (7) occurs. For the inflow and outflow of the cooling water, the tube sections 8, 9 are assembled in the holes in the second cooling plate member 3. Fastening the cooling plate 1 to the furnace wall 10 is achieved using, for example, a bridge 11 which is inserted into a holding part 12 assembled to the furnace wall and fixed by bolts 13 (FIG. 4). Reference). The first cooling plate member 2 is formed as a solid rolling bloom with a flat (in the sense of not bent) front 14, which is fitted with a refractory charge or an injection of the extrudate at the end of assembly. An easy groove 15 is provided across the longitudinal axis of the cooling plate 1.

The cooling water side back surface of the first cooling plate member 2 or shield is provided with two recesses 16, 17 extending parallel to the longitudinal axis of the cooling plate 1 and spaced apart from each other. 17) themselves represent roughly semicircular cross sections, respectively. The cooling channel 7 is closed by the second cooling plate member 3 on the rear side, ie on the side of the complementary part which is approximately flat or slightly bent outward on the side facing the furnace wall. Viewed relative to the longitudinal extension (x direction) results in a cooling channel having a cross section in which the cross sections of the end zones 18, 19 are larger than the cross section of the central zone 20.

2 shows another preferred embodiment of a cooling plate 101 with a cooling channel cross section claimed in accordance with the present invention. In this embodiment, the desired cross section of the cooling channel 107 (where the cross section is a cross section perpendicular to the longitudinal axis of the cooling plate) is determined by the shape of the second cooling plate member 103. Such second cooling plate member 103 is formed in a trap shape. By the curved course of the traps 121, 122 and the formation of a short or long central zone 123, the desired end sections 118, 119 of the cross section are larger than the central zone 123 of the cross section. A cross section will be provided.

To mechanically stabilize such cooling plate 101, the second trapped cooling plate member 203 or copper plate is reinforced at its edge regions 324, 325 as shown in FIG. 3. That is, it is formed thicker. It is made possible by, for example, profiling rolling.

4 shows a longitudinal cross-sectional view of the cooling plate 1 in a position fixed to the wall of a furnace, for example a blast furnace. After fixing the cooling plate 1 by the bridge / holder principle, the remaining space between the cooling plate 1 and the furnace wall 10 is filled with the rear filling 26. The tube sections 8, 9 are welded 27 to the second cooling plate 3. The cooling channel 1 is closed by caps 28, 29 at the free end.

Another preferred embodiment of the cooling plate 1 starting from the embodiment according to FIG. 1 is shown in FIG. 5. The solid first cooling plate member 1 is further hollowed out in an area facing the pipe section for cooling water inlet or outlet (hollow part 30) to allow the inlet or outlet area to be enlarged. Such cross-sectional enlargement is gradually (in ramp) adapted to the course of the cooling channel recesses 16, 17. It works advantageously to prevent coolant pressure loss.

Since the second cooling plate member 3 is attached to the rear surface of the first cooling plate member 2 so that the edge regions 2a and 2b (or fin regions) are not covered, the first cooling plate member 3 is undulated There is a risk of this. It is prevented by providing a slit 31 in the edge regions 2a and 2b across the longitudinal axis of the cooling plate, which slit 31 extends from the edge region 32 to approximately the second cooling plate member 3. Is extended. Based on such slit, the edge region in use can be thermally expanded without being stressed.

The cooling plate according to the invention is incorporated into a cooling system. The cooling plates are arranged directly next to one another, for example, whose stability can be supported by the spring / groove principle introduced in the first cooling plate member. Optionally, the edge regions of the first cooling plate member may be arranged to overlap each other.

A portion of such a cooling system 33 comprising a plurality of cooling plates 1 or gratings is shown in FIG. 7, which also shows a further preferred suspension system for suspending the gratings to the furnace wall 10. have. In order to suspend the plate, each cooling plate 1 or each plate has a number of, here six, suspension points 34 to 39, with each upper suspension point 34, 35 being a fixed point. Formed and the underlying suspension points 36 to 39 are formed as separation points.

At fixing points 34 and 35 (see FIGS. 8 and in particular FIG. 9), a fastening is achieved between the cooling plate 1 and the furnace wall 10 by tightening the screws 40 from above. To this end, projections 41 are respectively attached to the furnace wall 10 by welding, and corresponding projections 42 are respectively attached to the back surface of the cooling plate 1 outside the cooling channel zone, the projections 41 and 42. ) Are coupled to each other by screws 40 with holes corresponding to each other. Separation points 36 to 39 are configured similarly to door suspension devices as can be seen in detail from FIG. 10. For this purpose, the cooling plate is provided with projections 43 which are also perforated at the corresponding points on their backs, which projections 43 are held on each fin 44 protruding from the furnace wall by projections 45. Hang Such separation points 36 to 39 allow the cooling plate 1 to thermally expand downward. In order to ensure that the space required for thermal expansion at the suspension device or at the separation point is not blocked by the rear filling, a blank part made of plastic, preferably styropoll, is inserted at that point during assembly.

On the basis of the cooling channel cross section as proposed, there is provided a flow plate that is optimized in flow technology and cooling technology as a whole, which is also advantageous in manufacturing technology compared to the known plate. By means of the thinner plate according to the invention, which is thinner than known copper platelets, significant material and weight savings are realized, which together with the result of increasing the available volume of the furnace zone.

Claims (12)

The first rolled cold plate members 2 and 102 and the second rear rolled cold plate members 3 and 103 toward the furnace interior Oi, which are welded to each other; Cooling channels 7 and 107 formed between the first cooling plate member and the second cooling plate member, and In the furnace refrigeration plate (1, 101) with a refractory lining provided with pipe sections (8, 9) for coolant inflow or outflow, The first cooling plate members 2, 102 are formed as a bloom with a flat front face 14 towards the furnace interior Oi, the cross section of the cooling channel being based on the longitudinal extension of the cross section as a reference to the central zone ( Cooling plate for a furnace with a refractory lining, characterized in that it is larger in the end zones (18, 19; 118, 119) than in 20 (120). Cooling plate according to claim 1, characterized in that the half or both end zones (18, 19; 118, 119) are bent. The cooling channel cross section according to claim 1 or 2, wherein the cooling channel cross section has a first cooling plate member (with two or more recesses (16, 17) extending on its rear surface (5) on the side facing the furnace interior (Oi). Cooling plate, characterized in that formed by 2). 4. The cooling channel cross section according to any one of the preceding claims, characterized in that the cooling channel cross section is formed by at least one double trapped second cooling plate member (103) with an arch from the rear side towards the furnace wall. Cooling plate. Cooling plate according to claim 3, characterized in that the cooling channel cross section is formed by a second cooling plate member (3) which is approximately flat on the rear side. 6. Cooling plate according to claim 4 or 5, characterized in that the second cooling plate member (103) is formed thicker in its edge zone (324, 325) than in its central zone. The second cooling plate member (3, 103) is welded to the back surface of the first cooling plate member (2, 102) by the longitudinal edge thereof. Cooling plate. 8. The second cooling plate member (3) is welded to the rear surface of the first cooling plate member (2) while being spaced apart from the edge of the first cooling plate member (2). Cooling plate, characterized in that at least one slit (31) is provided in the edge zone (2a, 2b) of the vertical) perpendicular to the longitudinal axis of the cooling plate. 9. The coolant inlet or outlet tube sections 8, 9 protrude through the holes in the second rear cooling plate member 3 and the tube sections 8, 9 according to claim 3. Cooling plate, characterized in that the first cooling plate member (2) is formed hollow at the height of), and the depth of the hollow portion (39) is ramped down towards the cooling channel recess (16, 17). 10. Cooling plate (1, 101) has at least two suspension points (34, 38) for engagement with furnace wall (10) of the furnace, Suspension point (34) is formed in the upper portion of the cooling plate as a fixed coupling portion, the second suspension point (38) is formed in the lower portion of the cooling plate as a separate coupling portion. Cooling plate according to claim 10, characterized in that the first suspension point (34) as a fixed coupling comprises a screw coupling and the second suspension point (38) as a separate coupling comprises a U link. 12. A fire resistant lining comprising a plurality of cooling plates 1, 101 according to any one of claims 1 to 11, arranged side by side and / or up and down with each other and made of rolled copper or rolled copper alloy. The cooling system 33 for a furnace provided.