JPS6089512A - Metallurgical vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 connection and a cooling medium distribution device extending along the outer wall line or transversely or obliquely to the wall thereof, through which the cooling medium flows. It concerns a stationary or replaceable steel mill converter in which a removable 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.

PRIOR TECHNOLOGY It is known to install cooling pipes on the outside of the top outer wall of a steel mill converter (West German Patent Application No. 175 856).
2 specification). Here, for safety reasons, individual cooling coils are routed around the top of the converter so that if one cooling coil breaks, a minimum cooling effect is maintained by an adjacent intact cooling coil. ing.

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 (West German Patent Application No. 213566
No. 8), when a tube half section is welded from the outside onto the outer wall of the top of the converter, there is a problem that cross-sectional shrinkage may occur in the cooling corrugated tube due to a poorly executed weld joint. be. 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. These lateral coupling paths create an extremely uncontrollable environment in terms of the amount of heat received, so that the cooling medium with a high temperature is directed into the zone of high heat production, which deteriorates the cooling effect of the entire system. Control and regulation are extremely difficult with this system.

Other publicly known proposals (French patent specification ■: No. 147324
No. 3) considers the outer wall of the container, which itself is 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 the cooling pipe segments in all sections are equipped with cooling pipes of the same size cross section, and in order to avoid thermal stress differences at the welded seams that join the pipes, the converter peripheral wall formed by the pipes must be This is because it must be continuously cooled.

The object of the invention is to provide a clearly controllable, adjustable, and simple 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 problem set is that the upper part of the container, the middle part of the container and the lower part of the container are each provided with completely annular and independent cooling circulation pipes which are spatially separated from each other, one or more in each case. The solution is that several cooling circulation lines can be connected depending on the local brick lining thickness of the container, either given or produced by the operation.

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
The most economical operation of the cooling system results in optimization of the operating method during the operation of the furnace.

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 circuit 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 to be particularly advantageous that thinner traces in the pre-brick are allowed compared to uncooled containers. Precisely controllable and even adjustable cooling systems have been created which extend the life of the vessel in the furnace by means of the illustrated measures, thereby increasing the number of times the vessel can be charged before being relined. The operating costs per ton of metal, especially 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. Each common cooling medium conduit is equipped with a branch pipe and a branch valve installed therein, so that the independent cooling circulation line can be easily connected and disconnected to achieve clear control of other half-finished products. The method is such that the cooling circulation lines each have a separate coolant lead line starting from a coolant distribution device and being connected to a common coolant return line. In this way, the coolant lead lines and the coolant return lines in the dangerous areas of metallurgical work can be connected from below to the respective cooling circulation lines, 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 suitably supported metallurgical container with a supporting ring, in which the cooling medium leading and return conduits in the middle and lower part of the container pass through the supporting ring. , can be improved by extending below the support ring. In this case, a self-cooled or uncooled support ring is provided.

Interrupting the cooling for repair work or switching to another cooling medium, for example 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,
A mixture of water and steam, high pressure wet steam, etc. are used.

Furthermore, the parts important for control or regulation are electrically 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 in principle has a volitional drive, i.e. is controlled and regulated volitionally,
Investigations can also be carried out within relatively protected areas during metallurgical work.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The metallurgical vessel according to FIG. 1 may consist of a steel mill converter (as shown), a steel ladle lined with a thin refractory brick, an electric melting furnace, etc., for example. 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.

The container 1 is in its σ position (the position where the opening is facing upward,
) is suspended in a support ring 9 by means of a ledge 8 and a prestressed drawbar, not shown;
In the tilted position, the support ring is supported so as to be tiltable by 36σ on the tilting shaft necks 10 and 11. 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 15 of which does not carry out any tilting movements together, so that the support 16
It is firmly supported on the tilting stand 13 by. The casing 15 is sealed by a /4 lock 17 and the tilting shaft neck 11
is maintained. A tilting drive, not shown, engages the tilting shaft neck 10. Casing 1 (not shown)
It can be replaced after loosening the prestressed drawbar.

In the container upper part 3, the container middle part 5 and the container lower part 7 there are pipe units 18, which for example extend on the outside along the outer wall line, and which flow through them 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 ffl line which is spatially separated from the adjacent cooling circulation line. It can be separated into two parts to handle a completely circular surface, and of course can be supplied or shut off. A cooling circulation pipe 19 is attached to 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 line 21 is assigned to the lower part 7 of the container. Depending on the thickness 22 of the brick lining, which is initially present or results from operation, the cooling circulation lines 19, 20.21 are connected or disconnected. 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 entire cooling circulation line 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 lead line 23 as well as a return line 24, both lines being connected to a cooling medium distribution device 25, which distributes the cooling medium. A common cooling medium advance conduit 23 and a common cooling medium return 2# pipe 24 according to the cooling diagram connected to the preparation device and/or the heat exchanger provide a particularly clear control of the pressure, temperature and velocity as well as the cooling medium quantity. Control or adjustment is possible. Cooling circulation lines 19.20 and 21 are connected to the branching device 2G by means of control valves 27.28 and 29, respectively. In the flow direction, cooling circulation pipes 19°20.
21 is connected to a common coolant return conduit 24 with coolant branches 30, 31 and 32, in this case the coolant quantity! 30, 31 and 32 are each provided with a discharge valve 34 and a regulating valve 35 adjacent in the direction of flow.

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 23Q allow an equally clear control or regulation of the pressure, temperature and velocity as well as the coolant quantity. As mentioned above, the amount of cooling medium %30, 31 and 32 communicating with the common cooling body return conduit 24 includes:
A discharge valve 34 and a regulating valve 35 are provided in each case in front of and in the direction of flow. The cooling medium advance conductor 23 or 23a to 23c and the cooling medium return conduit 24 are connected to at least the container central portion 5 and the container lower portion 7.
inside and below the support ring 9. If the supporting ring 9 is not present, a retaining ring with a similar function is used.
, 20 or 21 can be emptied separately. During metallurgical work, the control valves 27, 28, 29 can be regulated, monitored or monitored in the part between the middle part 5 and the lower part 7 of the container, even when connected according to FIG. .

The described control and regulation connections, which can easily be foreseen in terms of technology, are provided for all or individual cooling circulation lines 19.20.
21 pipe units 18 are installed on the peripheral wall on the inner side (the thickness of the preliminary brick lining, 2
It can be maintained even when it is located within 2).

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of an IFT factory converter as a metallurgical vessel, FIG. 2 is a first connection diagram of a cooling circulation pipe, and FIG. FIG. 2 is a second connection diagram of a cooling circulation pipe according to another embodiment.

Claims (1)

[Claims] 1. Metallurgy, in which a pipe unit is arranged on its wall, which extends along the line of the outer wall or laterally or diagonally, through which the cooling medium flows, and which can be connected and disconnected starting from a cooling medium distribution device. In the container, the upper part of the container (3), the center part of the container (
5) and the lower part of the container (7), there are completely annular independent cooling circulation pipes (19, 20) spatially separated from each other.
, 21) and one or more cooling circulation lines (19° 20 , 21 ) in each case depending on the local brick lining thickness 22) of the container (1) caused by the given or operation. A metallurgical container characterized in that it can be connected as a metallurgical container. 2. All cooling circulation conduits (19, 20, 21) are connected to a common coolant advance conduit (23) and a common coolant return conduit (24) (FIG. 2), as claimed in the patent claim. A metallurgical container according to scope 1. 3. The cooling circulation pipes (19, 20, 21) each have a separate cooling medium advance guide If (23a, 23b, 23c)
starts from a cooling medium distribution device (25) and is connected to a common cooling medium return conduit (24) (FIG. 3). 5) and the vessel lower part (7), the coolant advance conduits (23:23a, 23b. 23C) and the coolant return conduits (24) pass through the support ring (9) and extend below the support ring (9). (FIG. 1), a metallurgical container according to any one of claims 1 to 3. 5. Each cooling medium advancing conduit (23; 23a, 23b, 23
c) and one control valve (27-29; 35) is assigned to each cooling medium return conduit (24), and an additional discharge valve (27-29; 35) is assigned to each cooling medium branch (fl (30. 34), the metallurgical container according to any one of claims 1 to 4. 6. Control valves (27-29; 35) and discharge valve (34)
6. Metallurgical container according to claim 1, wherein the metallurgical container is arranged in the area between the container middle part (, 5) and the container lower part (7).