FR2552106A1 - METALLURGICAL VESSEL, IN PARTICULAR A STATIONARY OR INTERCHANGEABLE STEEL CONVERTER - Google Patents

Abstract

A. METALLURGIC TANK, ESPECIALLY A STATIONARY OR INTERCHANGEABLE STEEL CONVERTER. B. TANK CHARACTERIZED IN THAT, ON THE PART OF THE UPPER TANK 3, ON THE PART OF THE MEDIAN TANK 5, AND ON THE PART OF THE LOWER TANK 7, ARE PROVIDED, RESPECTIVELY, SPATIALLY SEPARATE FROM ONE OF THE OTHER , AUTONOMOUS COOLING CIRCUITS IN THE FORM OF A COMPLETE RING 19, 20, 21, PROVIDED TO BE CONNECTED DEPENDING ON THE LOCAL THICKNESS OF THE TANK COATING MASONRY, PROVIDED OR REQUIRED BY THE OPERATION. C. THE INVENTION CONCERNS A METALLURGIC TANK, IN PARTICULAR A STATIONARY OR INTERCHANGEABLE STEEL CONVERTER.

Description

"Metallurgical tank, especially a steel converter

stationary or interchangeable ".

  The invention relates to a metallurgical vessel 5, in particular a stationary or interchangeable steel converter, on the surfaces of which tubular elements are arranged, extending over the envelope generators transversely or obliquely, traversed by a cooling fluid, which can be connected or disconnected from a distribution line

of cooling fluid.

  Such cooled metallurgical vessels serve, with increased security, that the vessel shell materials are maintained in the areas of solidity conditions which are the basis for the calculation.

resistances.

  It is known (in DE 17 58 562) to equip the bonnet casing with a steel converter, externally, with cooling pipes. For safety reasons, several individual turns of cooling pipes are applied around the converter cover, so that, in the event of pipe drains failing, a minimum cooling effect is maintained by the intact coil turns. This system has a proven track record; however this solution includes in all cases only

the capot of the converter.

  Another known proposal represents an extension of the previous previous solution. This document concerning the extension (DE-OS 21 35 668) raises a problem which is posed, in the case of tubular retaining sections welded externally on the bonnet casing. of the converter, whose poorly executed weld seams may cause cross-sectional shrinkage within such a cooling coil I 1 as a result of which the fluid flow is irregular and as a consequence the cooling effect is adversely influenced In order to avoid excessive curvatures and diversions, it is provided in this patent to interconnect the half pipes of each group of pipes, at least at one place, by means of transverse channels. however, the transverse connections create an extremely uncontrollable situation in terms of the amounts of heat absorbed, so that At higher temperatures, cooling is carried out in areas with increased heat generation, which has an adverse effect on

  the cooling power of the entire system.

  On the other hand, a command and a regulation are made

  considerably more difficult with this system.

  Another known proposal (patent FR 1 473 423) provides a tank shell which is itself constituted by cooling pipes. The cooling pipes are then welded to segments so that four segments complement each other around the periphery. a complete ring This proposal makes it possible to cool the steel converter in correspondence with the heating of the individual portions of the converter However, it is not clear how control and regulation could take place, because the segments of cooling pipes of all the portions are provided with cooling pipes of the same cross-section and, because a converter wall formed of pipes must be cooled permanently to avoid differences in thermal tension in the welding cords that connect

the pipes.

  The present invention poses the problem of producing a simple cooling system, with precise control and regulation and which takes into account the particularities of operation of a metallurgical vessel.

  produced during its lifetime.

  This problem is solved, according to the invention, by the fact that, in the upper tank section, self-cooling circuits in the form of a complete ring, spatially separated from one another, are provided on the lower tank portion and on the middle tank portion, such that one or more of the cooling circuits may be locally connected each time depending on the thickness of the masonry of the tank provided or required

for operation.

  The advantage of articulation in fixed clean circuits, represents a greater use

  high masonry thickness in areas particularly needed by friction wear.

  The invention leads to an operation of the process flow mode during an operation of the furnace by a more economical operation of the cooling system. It has been found in practice that after refurbishment of a tank, the entire masonry does not There is no need for cooling in the bottom zone and in the middle zone and such cooling would be an unnecessary expense. After a number of charges depending on the size of the vessel, and a correspondingly reduced masonry thickness, a connection It is of particular advantage that one can consider the fact of maintaining a smaller thickness of remaining masonry compared to uncooled vessels. The cooling system, which can be controlled and furthermore regulated, prolongs the life of a tank, thanks to the measures mentioned, and thus increases the number of loads up to a ovation of the state of

  the vessel and accordingly reduces the processing cost per tonne of metal produced, especially steel.

  The cooling circuits, in order to define the desired precise control regions, are of simple construction. Thus, it is proposed that all the cooling circuits be connected to a common cooling fluid supply line. and a common return line The simplest way of connecting and disconnecting particular cooling circuits is obtained by

  providing that the common fluid conduit in question is provided with bypass and bypass valves.

  Another solution for precise control zones is that the cooling circuits each depart from coolant supply lines separated from the coolant distribution network and are connected to a common return line of the cooling medium. These measurements provide the assurance that the coolant supply lines and also the return lines, in the hazardous areas of the metallurgical process, can each be connected from below to the cooling circuit and be fed through

the top in these dangerous areas.

  This protection for the supply and return lines of the cooling fluid can be further improved in the case of metallurgical vessels provided with a support ring, by passing the supply and return lines for the middle part of the The vessel, through the support ring and extending beneath this ring This assumes both a cooled support ring and an uncooled ring. The interruption of the cooling for repair work or for the change with another cooling fluid, for example to locally increase the cooling effect, or to switch on a heat recovery system, requires special measures that are determined. It is assumed that at each of the coolant supply lines and at each of the fluid return lines a control valve is assigned, and at each of the fluid draw lines, is assigned to

supplement a drain valve.

  As cooling fluid, water, or a mixture of water and steam, or a high-voltage wet steam or the like can be used. The essential elements for control and adjustment are additionally protected by arranging the regulating valves and the draining valves in the area between the middle part of the tank and the

  lower part of the tank Since the valves are not basically electronically driven, that is to say are controlled and electrically adjusted, an intervention can take place, even during the metallurgical operation, in the zones as well. relatively protected.

  Embodiments of the invention are described below and schematically shown in the accompanying drawings which show: Figure 1 is a side elevational view of a steel converter in the form of a

metallurgical tank.

  Figure 2, a first diagram of the connections and assemblies of the cooling circuits.

  Figure 3, a second diagram of the cooling circuits for another embodiment. The metallurgical vessel 1 according to FIG. 1 consists of a steel converter (as depicted) or for example comprises a thin-walled masonry tank, an electric melting furnace or the like.

  3, the cylindrical zone of the converter 4 forms the median part of the tank 5 and the bottom of the converter forms the lower part of the tank 7.

  The tank 1 is suspended in its position called "O" (corresponding to a position with mouthpiece

  upwards) by means of the pre-tensioned tabs 8 and pull rods, not shown, in the supporting ring 9, which is supported, by means of the tilting journals 10 and 11 in the lateral tilting frames 12 and 13, so that it can switch 360 degrees.

  This possibility of tilting of the vessel 1 requires, for the supply and discharge of the cooling fluid, a rotary feed device 14, whose housing does not follow the tilting movement and, consequently, is fixed to Tilt frame 13 by means of support spacers 16 The housing 15 is held in seal by means of the seal 17 on the tilting pin 11.

  tilting, not shown, attacks the journal 10.

  The tank 1 can be exchanged after detachment of the supposed struts, not shown.

  On the part of the upper vessel 3, 35 on the middle part 5 and on the part of the lower vessel 7, there are provided tubular elements 18, traversed by the cooling fluid extending for example externally along the generatrices of the The respective tubular members disposed on the periphery of the upper vessel portion 7, the middle vessel portion 5 and the lower vessel portion 7 together form a spatially separated cooling circuit of the adjacent cooling circuit. by covering a complete annular surface and

  can obviously be connected and disconnected at will.

  The cooling circuit 19 (-figure 2) is assigned to the upper part 3, the circuit 20 is assigned to the

  middle part 5 and the circuit 20 is assigned to the lower part of the tank 7.

  The cooling circuits 19, 20, 21 can be connected or disconnected according to the coating masonry thickness 22, existing at the beginning, or put in place to satisfy the working conditions In accordance with the basic principle of the invention, it It is possible to voluntarily adopt a masonry thickness 22 kept low which is related to a continuous operation of all the circuits of

cooling 19, 20, 21.

  The technical arrangement of the mounting scheme can be achieved in various ways. The tilt pin 11 is hollow and drives the supply line 23 and the fluid return line 24, both of which are connected to the installation. A coolant distribution manifold which also serves as a fluid collector which can be connected to a fluid cooler and / or

heat exchanger.

  A special arrangement for controlling and regulating pressure, temperature, speed and quantity of cooling fluid is obtained 255 Z 10 d by means of the common supply line 23 and the common return line 24 in accordance with the On the branch 26 the cooling circuits 19, 20 and 21 are connected by means of regulating valves 27, 28 and 29. In the direction of the flow, the cooling circuits 19, 20, 21 are connected to the pipe. common return 24 with cooling fluid withdrawal lines 30, 31 and 32, each of which is equipped with a drain valve 34 10 and a control valve 35 mounted upstream Thus is possible a separate drain of each of the circuits

  of cooling fluid 19, 20, 21.

  Separate control and adjustment of pressure and temperature, velocity and amount of coolant are also made possible according to another embodiment shown in Fig. 3, with supply lines

  of separate cooling fluid 23a, 23b and 23c.

  The respective control valves 27, 28, 29 are located here before the fluid dispensing device 25 The fluid withdrawal lines 30, 31 and 32 to the common return line 24 are each equipped, as described above, with Draining valves 34 mounted upstream in the direction of flow and control valves 35 mounted thereupon The feed lines 23 and 23a to 23c and the return lines 24 are less for the middle tank part 5 and for the lower tank part 7, inside and below the bearing ring 9 In the case of absence of a carrier ring 9,

  uses a protective ring of similar effect.

  The drain valves 34 allow separate draining of one of the cooling circuits 19, 20 or 21 on which separation work is to be carried out. During the metallurgical operation, the control valves 27, 28, 29, even if they are connected according to FIG. 2, in the zone between the median part of the tank 5 and the lower part 7,

  allowing their monitoring and observation.

  The control and regulation technical assembly described, which is easy to monitor, can also be retained, when the tubular elements 18 of all

  the individual circuits 19, 20, 21 are arranged not on the outside of the wall, but on the inside thereof (within the thickness of the remaining masonry).

1.0

RE VE N D I C AT IO N S

  1) metallurgical vessel, in particular stationary or interchangeable converter of steel, on the wall surfaces, of which, on the generatrices 5 or transversely or obliquely thereto, are arranged tubular elements traversed by a cooling fluid, which can be connected or disconnected, starting from a cooling fluid distribution device, tank characterized in that, on the part of the upper tank (3), on the part of the median tank (5), and on the part of the lower tank (7) are arranged, respectively spatially separated from each other, autonomous complete ring-shaped cooling circuits (19, 20, 21) intended to be

  connected in dependence of the local coating masonry thickness (22) of the vessel (1), provided or required by the operation.

  2) metallurgical vessel according to claim 1, characterized in that all the cooling circuits (19, 20, 21) are connected to a common fluid supply pipe (23) and to a pipe

  common return (24) of coolant.

  3) metallurgical vessel according to claim 1, characterized in that the cooling circuits (19, 20, 21) from the cooling fluid distribution device and are connected to

  a common fluid return line (24).

  4) metallurgical vessel according to any one of claims 1 to 3, provided

  of a carrier ring, characterized in that the conduits

  supplying coolant (23, 23a, 23b, 23c) and fluid return lines (24) for the middle tank portion (5) and for the lower tank portion (7) extend through the carrier ring (9) and below this carrier ring.

   Metallurgical vessel according to one of Claims 1 to 4, characterized in that

  that at each of the supply lines (23, 23a, 23b, 23c) and each return line (24) is assigned a control valve (27 to 29, 35) and to each withdrawal line coolant (30, 31, 32) is

  additionally assigned a drain valve (34).

  6. A metallurgical vessel according to any one of claims 1 to 5, characterized in that the control valves (27 to 29; 35) and the valves

  (34) are arranged in the region between the middle vessel portion (5) and the vessel portion

lower (7).