JPH0422966B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The invention relates to a metallurgical vessel, in particular to a metallurgical vessel, in particular to a metallurgical vessel, in particular a metallurgical vessel, in which a connection and a cooling medium distribution device starting from a coolant distribution device extending along the outer wall line or transversely or obliquely through which the coolant flows. It concerns a stationary or replaceable steel mill converter in which a shut-off tube unit is arranged.

Such cooled metallurgical vessels serve to improve safety by keeping the vessel wall material within the strength range on which strength calculations are based.

BACKGROUND OF THE INVENTION It is known to install cooling pipes on the outside of the top outer wall of a steel mill converter (German Patent Application No. 1758562). Here, for safety reasons, individual cooling coils are installed in each case at the top of the converter so that if one cooling coil breaks, a minimum cooling effect is maintained by the adjacent intact cooling coil. It's getting old. This system has proven advantageous. However, this known method only captures the top of the converter.

Another known proposal is an implementation of the previous method described above. This embodiment (DE 21 35 668) involves the possibility that if the pipe halves are welded from the outside onto the outer wall of the top of the converter, the cooling loss caused by the poorly executed weld seam is There is a problem in that cross-sectional shrinkage can occur within the tube. This resulted in irregular flow and, as a result, poor cooling effect. In order to avoid various large bends and turns, it has been proposed to connect the tube halves of each tube group to one another at least in one place by a transverse channel. Since these lateral coupling paths create a highly uncontrollable environment in terms of the amount of heat received, the cooling medium with a high temperature is directed into the zone of high heat production, thereby impairing the cooling effect of the entire system. Control and regulation are significantly more difficult with this system.

Other publicly known proposals (French patent specification no.
No. 1473243) considers a container outer wall which is itself formed from cooling pipes. The cooling tubes are welded into segments, the four segments each forming a complete ring over the entire circumference. Although this proposal does indeed allow steel mill converters to cool the heated parts of the individual converter sections, it is not clear how to control and regulate them. The reason for this is that all cooling pipe segments have cooling pipes with the same cross section, and in order to avoid thermal stress differences at the welded seams that join the pipes,
This is because the converter peripheral wall formed by the tubes must be continuously cooled.

The object of the invention is to provide a simple, clearly controllable and adjustable cooling system that takes into account the operating characteristics of the metallurgical vessel that occur during the operation of the furnace.

According to the invention, the task set is that the upper part of the container,
A container in which the central part of the container and the lower part of the container are each provided with completely annular, independent cooling circulation lines which are spatially separated from each other, and in each case one or several cooling circulation lines are provided in a given or operational manner. is solved by being connectable depending on the local brick lining thickness. The advantage of dividing into independent circulation lines is the high utilization of the brick lining, especially in areas subject to wear. The present invention results in an optimization of the operating method during the operation of the furnace in the most economical operation of the cooling system. In practice,
After freshly lining the container, the all-brick lining does not require cooling in the bottom and middle parts, which would cause unnecessary operating costs. It is advantageous to connect the locally existing cooling circulation lines after the charging number, which depends on the size of the respective container, and the thickness of the brick lining has been reduced accordingly. It is considered particularly advantageous that a thinner pre-brick lining is allowed compared to uncooled containers. Precisely controllable and even adjustable cooling systems extend the life of the vessel in the furnace in accordance with the measures shown, thereby increasing the number of times the vessel can be relined, thereby reducing the amount of metal produced, In particular, the operating costs per ton of steel are reduced.

The cooling circuit lines are connected very simply to reveal the targeted control system.
It is therefore proposed that all cooling circuits are connected to one common coolant lead line and one common coolant return line. The fact that each common cooling medium conduit is equipped with a branch pipe and a branch valve provided therein results in a simple connection and disconnection of the independent cooling circulation lines.

Another way of aiming for an unambiguous control system is for the cooling circulation lines to be such that each separate cooling medium advance conduit starts from the cooling medium distribution device and is connected to a common cooling medium return conduit. In this way, it is possible to connect the coolant lead lines as well as the coolant return lines in the hazardous areas of the metallurgical work to the respective cooling circulation lines from below, and then from above in the less dangerous areas.

Furthermore, this protection of the cooling medium lead or return conduits can be achieved in a correspondingly supported metallurgical container with a supporting ring, in which the cooling medium leading and returning conduits in the middle and lower part of the container pass through the supporting ring. This can be improved by extending below the support ring. In this case, a self-cooled or uncooled support ring is provided.

Interruption of cooling for repair work or switching to other cooling media, e.g. to locally increase the cooling effect or switching to a heat recovery system,
Requires certain special measures. A special measure for this is that each coolant lead line and each coolant return line is each assigned a control valve, and each coolant branch line is additionally assigned a discharge valve. As a cooling medium, water,
Water/steam mixtures, high pressure wet steam, etc. are used.

Furthermore, the parts important for control or regulation are protected by the fact that the control valve and the discharge valve are arranged between the middle part of the container and the lower part of the container. Unless the valve does not in principle have an electrical regulating drive, i.e. it is electrically controlled and regulated,
Investigations can also be carried out within relatively protected areas during metallurgical work.

EXAMPLES The metallurgical vessel according to FIG. 1 consists of a steel mill converter (as shown) or, for example, a thin refractory brick-lined steel ladle, an electric melting furnace, etc. Here, the converter top 2 forms the vessel upper part 3, the cylindrical converter part 4 forms the vessel center 5 and the converter bottom 6 forms the vessel lower part 7.

In its 0° position (corresponding to the position with the opening facing upwards), the container 1 is suspended in a support ring 9 by means of a ledge 8 and a prestressed drawbar, not shown. In the tilted position, it is supported by tilting shaft necks 10 and 11 so as to be tiltable 360°. Due to this tilting possibility of the container 1, a so-called rotary supply device 14 is used for supplying or discharging the coolant, the housing 1 of which is
5 do not perform the tilting movement together, and therefore support 1
6, it is firmly fixed to the tilting stand 13. The casing 15 is sealed by a packing 17 and held on the tilting shaft neck 11. A tilting drive, not shown, engages the tilting shaft neck 10. Casing 1
can be replaced after loosening the prestressed liner rod (not shown).

In the container upper part 3, the container middle part 5 and the container lower part 7, there are pipe units 18 which run, for example on the outside, along the outer wall line, through which the water flows before cooling. All pipe units arranged around the entire circumference of the upper part 3, the middle part 5 or the lower part 7 of the container each form a cooling circulation line which is spatially separated from the adjacent cooling circulation line. It can be separated to cover a complete annular surface and can of course be supplied or shut off. There is a cooling circulation pipe 19 in the upper part 3 of the container (Fig. 2).
A cooling circulation pipe 20 is attached to the central part 5 of the container.
A cooling circulation pipe 21 is attached to the lower part 7 of the container. The cooling circulation lines 19, 20, 21 are connected or disconnected depending on the thickness 22 of the brick lining, which is initially present or occurs during operation. According to the basic idea of the invention, the deliberately reduced thickness 22 of the brick lining can optionally be connected to the connection drive of the total cooling circulation lines 19, 20, 21.

The connection technology arrangement can be implemented in various ways. The tilting shaft neck 11 is hollow and accommodates a cooling medium advance conduit 23 as well as a return conduit 24, both conduits being connected to a cooling medium distribution device 25;
In this case, the distribution device also serves as a coolant reservoir, which is connected to a coolant preparation device and/or a heat exchanger.

The common coolant inlet line 23 and the common coolant return line 24 according to FIG. 2 allow a particularly clear control or regulation of the pressure, temperature and velocity as well as the amount of coolant. Cooling circulation lines 19, 20 and 21 are connected to the branching device 26 by control valves 27, 28 and 29, respectively.
In the flow direction, the cooling circulation lines 19, 20, 21 are connected to a common cooling medium return line 24 with cooling medium branches 30, 31 and 32, each of which has a , a discharge valve 34 and a regulating valve 35 are provided upstream in the flow direction. It is therefore possible to discharge each one of the coolant circulation lines 19, 20, 21 separately.

According to a further embodiment (FIG. 3), separate coolant passage conduits 23a, 23b and 23c allow an equally clear control or adjustment of the pressure, temperature and velocity and the coolant quantity. Coolant branch pipes 30, 3 leading to a common coolant return conduit 24
1 and 32 are each provided with a discharge valve 34 in front and a regulating valve 35 in rear thereof in the flow direction, as described above. The coolant lead conduits 23 or 23a to 23c and the coolant return conduit 24 are located inside and below the support ring 9, at least for the container middle part 5 and the container lower part 7. If the support ring 9 is not present,
Use a protective ring with similar action.

The drain valve 34 makes it possible to separately empty the cooling circulation line 19, 20 or 21 in which repair work is to be carried out. During metallurgical work, control valves 27, 28, 2
9 is adjusted at the part between the container center part 5 and the container lower part 7 even when connected according to FIG. 2,
Can be monitored or observed.

The described control and regulating connections, which are technically easily visible, are such that the tube units 18 of all or the individual cooling circulation lines 19, 20, 21 are not arranged externally on the jacket wall, but are located on the jacket wall. It can be maintained even when placed inside (within the thickness 22 of the pre-brick lining).

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of a steelmaking factory converter as a metallurgical vessel;
FIG. 2 is a first connection diagram of the cooling circulation pipe, and FIG. 3 is a second connection diagram of the cooling circulation pipe of another embodiment. 1... Metallurgical vessel, 2... Converter top, 3... Container top, 4... Converter cylindrical part, 5... Container center,
6... Bottom of converter, 7... Lower part of container, 8... Projection, 9... Support ring, 10, 11... Tilting shaft neck, 12, 13... Tilting stand, 14... Rotating supply device, 15 ...Casing, 16...Support,
17...Packing, 18...Pipe unit, 19,
20, 21...Cooling circulation pipe, 22...Thickness of brick lining, 23...Cooling medium advancing pipe, 24...
... Coolant return conduit, 25 ... Coolant distribution device, 26 ... Branch device, 27, 28, 29 ... Control valve, 30, 31, 32 ... Coolant branch pipe, 33
...Flow direction, 34...Discharge valve, 35...Control valve.

Claims (1)

[Claims] 1. In a metallurgical vessel in which a connecting and disconnectable pipe unit starting from a cooling medium distribution device is arranged on its wall, which extends along the outer wall line or transversely or obliquely and through which the cooling medium flows. , the upper part 3 of the container, the middle part 5 of the container 5 and the lower part of the container 7 are each provided with completely annular independent cooling circulation lines 19, 20, 21 which are spatially separated from each other, each having one or several cooling circulation lines. Road 19, 20, 2
Metallurgical vessel 1 is connectable depending on the local brick lining thickness 22 of the vessel 1, either predetermined or resulting from operation. 2. Metallurgy according to claim 1, in which all cooling circulation lines 19, 20, 21 are connected to a common coolant advance conduit 23 and a common coolant return conduit 24 (FIG. 2). container. 3. The cooling circulation lines 19, 20, 21 each have a separate coolant lead line 23a, 23b, 23c starting from the coolant distribution device 25 and are connected to a common coolant return line 24 (FIG. 3). , a metallurgical container according to claim 1. 4 Cooling medium advance conduits 23; 23a, 23b, 23c and cooling medium return conduits 24 for the vessel middle part 5 and vessel lower part 7 pass through the support ring 9 and extend below it (FIG. 1) , any one of claims 1 to 3
Metallurgical containers as described in Section. 5 Each cooling medium advancing conduit 23; 23a, 23b,
23c and each cooling medium return line 24 is assigned a control valve 27 to 29; Range 1
The metallurgical container according to any one of Items 1 to 4. 6. Any one of claims 1 to 5, wherein the control valves 27 to 29; 35 and the discharge valve 34 are arranged within the range between the container center 5 and the container lower part 7 Metallurgical vessel as described.