KR20050034581A - Cooling plate comprising a reinforcement element - Google Patents

Abstract

The invention relates to a cooling plate (1) comprising a reinforcement element for ovens provided with a refractory lining. Said cooling plate is provided with cooling agent channels (3) which are arranged inside the plate, and at least one additional cooling segment (4,8) comprising a cooling channel (5) in which a displacer (6) is inserted. The inventive cooling plate ensures uniform and homogeneous heat dissipation from the reinforcement element. Furthermore, the number of welds is minimised and the heat-exchanging surface is maximised.

Description

Cold plate with reinforcement {COOLING PLATE COMPRISING A REINFORCEMENT ELEMENT}

The present invention, for example, has a cooling passage arranged therein, in particular COREX ® made of a copper or low alloy copper alloy Reinforcement tops for melting vessels used to produce pig iron, blast furnace and shaft furnaces provided with refractory lining, including melter gasifiers; And / or to a cold plate with a reinforcement such as the bottom. Such cooling plates are made of forged or rolled blocks, the cooling passages being blind bores extending vertically, with tongues and grooves machined on the side facing the interior of the upright furnace.

This type of cold plate is usually arranged between the casing and the refractory lining and connected to the cooling system. On the side facing the process space, the refractory material is partially provided in the cooling element.

DE 39 25 280 discloses a cooling plate which is formed by a pipe cast into cast iron and in which the bottom edge of the plate body is configured as a bearing lug against a firebrickwork. have. These bearing lugs are likewise connected to the cooling system. Due to the low thermal conductivity of the cast iron and the resistance between the cooling pipe and the plate caused by the air gap or oxide layer, little heat is dissipated from these plates.

After a certain operating time, the internal surface of the cold plate is directly exposed to the furnace temperature by the loss of the firebrick into the uprights. The temperature of the furnace is likely to be above the melting point of the cast iron, the internal heat transfer resistance of the cold plate causes unsatisfactory cooling of the hot plate side, and accelerated wear on the cast iron plate is inevitable, thus limiting the service life. do.

It is also known that the plates are made from cast copper and the cooling passages are formed by cast-in tubes or indirectly by molding casting. The microstructures of cast copper are homogeneous and not dense, like the microstructures of forged or rolled copper. As a result, the heat conduction of the cast copper is not good and the strength is poor. In the case of a cast-in pipe, the oxide layer between the pipe and the copper block prevents thermal conduction.

DE 29 07 511 discloses a cold plate made of forged or rolled blocks, the cooling passages extending vertically of the blind bore formed by deep machine drilling. The microstructure of the cold plate is significantly higher density and more homogeneous compared to the microstructure of the cast copper plate. The voids often found in cast copper plates are prevented by the forming process. The strength value is higher and the thermal conductivity is more uniform and higher than the cast copper plate. The mechanical formation of the bore means that the desired position in the height and lateral position planes is maintained exactly, which results in a uniform dissipation of heat. On the side facing the interior of the furnace, the cold plate is lined by refractory ramming compounds or by refractory bricks. This reduces the cooling area of the plate and in the case of loss or wear of the pre-bricked refractory lining, extraction of heat from the furnace is limited. In addition, cooling of the plate requires sufficient strength to maintain the temperature of the heating surface of the plate below the softening point of copper.

DE-A 23 62 974 discloses a cooled upright furnace with a steel casing, to which the inner surface of the steel casing is connected a cooling plate with an almost vertical inner tube which is connected to the steel at the top and bottom of the cold plate. Penetrate the casing. On the side remote from the steel casing, the cooling plate is provided with a retaining protrusion or retaining lug, through which the other tube extending in a substantially horizontal plane extends as a connection through the steel casing.

FR-A 22 30 730 discloses a chiller for evaporative cooling of the blast furnace, which is equipped with a collar arranged across and proximate to the end of the plate, mounted in the collar and in the plate and having a coolant therein. And a tube that flows in. The inlet and outlet ends of these tubes are arranged at different heights on opposite sides of the collar. The tube for circulation of the coolant in the collar is configured to be arranged in the collar in such a way that the inlet and outlet ends are located between the outlet ends of the tubes lying in the plate. The ends of the members of the circulation tube in the collar located inside this collar are arranged at an angle of 2 ° to 4 ° with respect to the vertical, so that circulation of the coolant from the inlet end to the outlet end of the tube occurs.

US 4,071,230 discloses a cooling element for an upright furnace which is fixed to the inside of the furnace shell. The rectangular cooling element consists of five metal blocks, which are arranged in staggered formation on top of each other and attached to two pairs of cooling tubes extending vertically by suitable fastening elements. . These pairs of tubes have a coolant inlet at the bottom and a coolant inlet at the top, a path is formed through an opening in the metal furnace wall, and the metal block is cooled only on the outer surface of the side facing the blast furnace wall.

EP 0 705 906 A1 discloses a cold plate made of forged or rolled copper blocks, in which a cooling passage is introduced in addition to a blind bore extending vertically to cool the edge region. It is introduced into an edge, such as a smaller diameter vertical or horizontal blind bore, around a vertically arranged blind bore.

However, the drawbacks of the above-described rolled or forged copper cold plate are that the rod-bearing capacity of the cold plate at the top of the cold plate is less than optimal, and the service life of the refractory ramming compound or the fire brick is also inadequate.

EP 0 731 108 B1 discloses a cold plate with reinforcing and cooling tops. Cooling passages in the reinforcement are characterized by the fact that these passages are created by vertical and horizontal blind bores, and / or these arrangements. Cooling medium is supplied and discharged through the cooling pipe, which can be included in the cooling system of the upright furnace.

The drawback of this variant is that the cooling top is complex and not easy to manufacture, which often requires a tool change during the manufacture of the blind bore. Many welded or brazed joints are needed to tightly seal these blind bores. For reasons of manufacture, these welds and joints are quite close to the process chamber and are quite prone to breakage. Therefore, it is desirable to minimize the number of these welds and joints. In addition, the cooling passage area required to achieve the required cooling capacity is limited by the shape design of the attached fire resistant support.

1 is a view showing a horizontal section passing through the cooling plate in the state where the refractory support is fitted.

2 shows a cross section through a cold plate with forged beads.

3 shows a cross section through a releasably attached cooling segment.

Explanation of symbols on the main parts of the drawings

1: cold plate 2: pipe attachment / pipe section

3 blind bore / coolant passage 4 cooling segment

5 cooling passage / horizontal bore 6 displacement body

7: (for refrigerant supply and discharge) bore 8: reinforcement cooling segment / cooling bead

9: home 10: web

11: hole 12: pipe section

It is therefore an object of the present invention to provide cooling plates with reinforcements, in which the cooling and dissipation of heat in these coolants are likewise uniform and homogeneous, thus also ensuring improved cooling of the refractory furnace lining of the furnace shell. In addition, the number of required welds is reduced to a minimum, and at the same time the available heat exchange area is increased.

This object is achieved by the fact that one or more additional cooling segments are provided in which a cooling passage through which the displacement body is inserted is provided.

Surprisingly, it has been found that there is no need to provide a complex combination of vertical and horizontal blind bores for additional cooling segments. Rather, in order to achieve the required cooling action, it has been found that a cooling passage formed by the horizontal bore can be inserted in and that a further removable cooling element has been sufficient to fit, for example, in the forged or rolled cold plate of the upper or lower region. It became. In order to achieve the optimum flow rate required for heat transfer, the displacement body is further inserted into this bore. The end of this bore is hermetically sealed by a welding or brazing stopper and is connected to the cooling system by a copper pipe connecting piece.

As an alternative to the releasable cooling segment, a bead for the refractory brick may be forged outside of the copper block, in which case the cooling passages are drilled in a known manner.

In order to keep the heat exchange surface area of the cooling passage as large as possible, it is advantageous to select the diameter of the cooling passage as large as possible and to select at least larger than the diameter of the coolant passage of the cooling plate.

According to another advantageous embodiment according to the invention, the displacement body is configured as a cavity which routes the coolant.

In this type of embodiment, the displacement body is conveniently provided with apertures that exit the cooling passage and allow the cooling medium to pass into the interior of the displacement body and allow passage through the interior of the displacement body into the cooling passage. Include.

According to an advantageous embodiment, the bore for supplying and discharging the cooling water is open into the cooling passage.

According to an alternative embodiment, the pipe sections for supplying and discharging the coolant are opened into the displacement bodies which are configured as cavities, in which case the pipe sections are pushed into the bores and screwed to the displacement bodies at the positions where these bores are opened. It is fixed.

The bore for supplying and discharging the coolant may be configured to extend horizontally or obliquely.

The present invention will be described in more detail based on the schematic drawings of the embodiments.

1 shows, by way of example, a horizontal section passing through a cold plate 1 comprising five vertically arranged blind bores 3, a cooling passage 5, and an inserted displacement body 6. This cooling passage 5 is introduced into the cooling segment 4 and is formed by a horizontal bore.

Coolant is supplied to the blind bore 3 from below via a pipe attachment 2 connected to the coolant supply line, and the pipe section 2 is likewise applied to the cooling passage 5 formed by the horizontal bore in the cooling segment 4. Cooling water is supplied through. A bore 7 is also arranged in the cold plate 1 to ensure the supply and removal of cooling water through the wall of the blast furnace shell through the pipe attachment 2. The cooling circuits of the cooling plate 1 and the cooling segment 4 may be connected to the cooling system as cooling circuits in the form of either individual cooling circuits or common cooling circuits. The displacement body 6 has a hole 11, which allows cooling water to pass from the cooling passage 5 into the interior of the displacement body 6 and then from the displacement body 6. Allow cooling water to pass into the cooling passage (5). The direction of the flow of cooling water is indicated by the arrow.

FIG. 2 is a cross sectional view through a cold plate 1 with vertically arranged blind bores 3, the lower end or upper end of the blind bore 3 being terminated as desired by welding or soldering joints in a known manner. . Cooling water is supplied and discharged through the pipe section 2. A cooling passage 5 formed by the horizontal bore is introduced in, and a cooling bead 8 forged on the outside of the block is formed in the upper portion of the cooling plate 1. Once again, the displacement body 6 is inserted into the cooling passage 5 to ensure proper flow rate.

In this case, cooling water is supplied and discharged through the inclined bore 7. A pipe section 12, which always passes into the displacement body 6 and is threadedly coupled to the displacement body 6, is inserted into each inclined bore 7.

Thus, in the embodiment shown in FIG. 2, the coolant is supplied into the displacement body 6 and the coolant is discharged from the displacement body 6, while in the embodiment of FIG. 1, the coolant is supplied into the cooling passage 5. And the coolant is discharged from the cooling passage 5.

In order to introduce either a refractory material, ie a brick or a spraying / ramming compound, in each case a groove 9 bounded by the web 10 is provided with a cold plate ( 1) It is machined in and into cooling beads 8 on the side facing the process chamber.

3 shows a releasably fitted cooling segment 4 in which the cooling passage 5 formed by the horizontal bore has been introduced. The displacement body 6 is also shown here. In this case, the horizontal bore 5 is connected to the cooling circuit through the horizontal bore 7 in the cold plate 1 and then through the pipe connection 2 which subsequently passes through the wall of the shell.

Claims (7)

In the cold plate 1 with a reinforcement for a furnace provided with a fireproof lining, in which a coolant passage 3 is arranged, It is characterized in that at least one further cooling segment 4, 8 is provided, which is provided with a cooling passage 5, with a displacement body 6 inserted into the cooling passage 5. Cold plate with reinforcement. The method of claim 1, The diameter of the cooling passage 5 of the further cooling segments 4, 8 is characterized in that it is chosen larger than the coolant passage 3 in the cooling plate 1, Cold plate with reinforcement. The method according to claim 1 or 2, Said displacement body 6 is comprised as a cavity for routing the coolant, Cold plate with reinforcement. The method according to any one of claims 1 to 3, Said further cooling segment 4 is releasably fixed to said cooling plate 1, Cold plate with reinforcement. The method according to any one of claims 1 to 3, The further cooling segment 8 is characterized in that it is formed by beads forged on the outside of the cold plate 1, Cold plate with reinforcement. The method according to any one of claims 1 to 5, In the cooling passage (5) characterized in that the bore (7) is extended to supply and discharge the cooling water, Cold plate with reinforcement. The method according to any one of claims 3 to 6, A pipe section 12 extends into the displacement body 6 for supplying and discharging cooling water, which pipe section 12 is inserted into the bore 7, Cold plate with reinforcement.