EP3335812A1 - Cooling system for cooling rolling stock - Google Patents

Abstract

The invention relates to a cooling system (2) for cooling rolling stock, comprising a plurality of cooling bars (8) for applying a coolant to the rolling stock, exactly one own coolant supply line (36) for each of the cooling bars (8) and a feed system (9) for guiding the Coolant to the coolant supply lines (36), wherein each of the cooling bars (8) via its own coolant supply line (36) is connected to the supply system (9). It is further provided that the cooling system (2) has a bypass line (48, 52) for discharging a coolant flow from the supply system (9), which is connected on the input side to a connection element (51, 53) of the supply system (9).

Description

The invention relates to a cooling system for cooling rolling stock, which comprises a plurality of cooling bars for applying a coolant to the rolling stock, exactly its own coolant supply line for each of the cooling bars and a supply system for conducting the coolant to the coolant supply lines, each of the cooling bars via its own coolant supply line with connected to the supply system.

Such a cooling system is used to achieve a defined cooling of rolling stock. For this purpose, the rolling stock is fed to the cooling system. By means of the cooling bars, a coolant, usually water, is then applied to the rolling stock.

In particular during so-called hot rolling, a defined cooling of the rolling stock is of central importance in order to achieve desired material properties of the rolling stock, such as a desired microstructure.

If there is no rolling stock in the cooling system during a rolling break, the coolant supply to the cooling bars is usually interrupted. To interrupt the coolant supply, one or more shut-off devices of the cooling system are typically used.

An object of the invention is to provide an improved cooling system for cooling rolling stock.

This object is achieved by a cooling system with the features of claim 1.

The cooling system according to the invention comprises a plurality of cooling bars for applying a coolant to the rolling stock. Furthermore For example, the cooling system includes exactly its own coolant supply line for each of the chilled beams. That is, the cooling system has a plurality of coolant supply lines, wherein for each of the cooling bars exactly one separate coolant supply line is provided. Furthermore, the cooling system comprises a supply system for guiding the coolant to the coolant supply lines.

Further, it is provided in the cooling system that each of the cooling bars is connected via its own coolant supply line to the supply system. In other words, each of the chilled beams is connected to the supply system via the exact one coolant supply line associated with the respective chilled beam.

Furthermore, the cooling system has a bypass line for discharging a coolant flow from the supply system, which is connected on the input side to a connection element, in particular a connecting piece, of the supply system.

Advantageous developments of the invention are the subject of dependent claims and the following description.

The invention is based on the consideration that at a rapid interruption of the coolant supply pressure surges in the cooling system, in particular in their lines, may arise, which may damage components of the cooling system and may possibly lead to failure of the cooling system. The occurrence of pressure surges, which can damage the cooling system, is particularly problematic when the cooling system is operated in the so-called intensive cooling mode, since in this mode usually higher coolant pressures prevail in the lines of the cooling system than in an operation of the cooling system in the so-called laminar cooling mode.

The invention allows for an interruption of the coolant supply to the chilled beam, a drainage of the coolant from the supply system via the bypass line. The coolant is thus provided by the bypass line an alternative flow path. In this way, pressure surges in the cooling system can be avoided or at least reduced in the interruption of the coolant supply to the chilled beam. In turn, components of the cooling system can be spared and their respective life can be increased. Appropriately, the bypass line is released in an interruption of the coolant supply to the chilled beam.

Characterized in that the bypass line is connected to a connection element of the supply system, via the bypass line several chilled beams at a time, i. several chilled beams with the same bypass line, to be bridged. A separate bypass line for each of the coolant supply lines - and optionally a separate shut-off device for each such bypass line - is therefore not required. This allows a structurally simple and cost-effective design of the cooling system. In addition, this allows a control-technically simple operation of the cooling system.

For the purposes of the invention, a pipe, a pipe section or a system of pipes connected to one another can be understood as a line.

The term "connected" can be understood as a short form of the term "fluidly connected". An element of the refrigeration system can then be regarded as being connected to another element of the refrigeration system, if a fluid, in particular the previously mentioned coolant, can flow from one of the two elements to the other of the two elements.

Applying the coolant to the rolling stock can be understood as applying the coolant to a surface of the rolling stock. The coolant can be applied to the rolling stock from one or more sides. preferably, the coolant is applied to the rolling stock from above and from below.

The bypass line is preferably connected directly to the connection element of the supply system. That is, the bypass line may be directly connected to the supply system.

Conveniently, the respective coolant supply line (output side) is directly connected to the associated cooling beam. In the present case, a coolant supply line may be a line which supplies exactly one of the cooling bars with the coolant. Further, it is preferred if the respective cooling beam is connected exclusively via its own coolant supply line to the supply system. Preferably, the respective coolant supply line (input side) is connected directly to the supply system.

About the supply system, preferably all of the aforementioned cooling bars are supplied with the coolant. The delivery system may include one or more conduits. Preferably, the supply system comprises at least one main line and at least one distribution line. Conveniently, the main line is the output side indirectly or directly connected to the distribution line.

Furthermore, it is expedient if the coolant supply lines are connected on the input side indirectly or directly to the distribution line. On the output side, the respective coolant supply line is advantageously connected directly to the cooling beam assigned to it.

Advantageously, the cooling system comprises a coolant pump for increasing a coolant pressure in the supply system. It is expedient if the coolant pump is arranged in the aforementioned main line. The formulation that the coolant pump expediently arranged in the main line is not necessarily to be understood that the coolant pump is enclosed in such an arrangement of the main line. For example, the main line may have a first line section which is connected to an input of the coolant pump. In addition, the main line may have a second line section which is connected to an outlet of the coolant pump.

The coolant pump can be used to control the cooling capacity of the cooling system. In addition to the coolant pump, other elements of the cooling system, such as one or more control valves, may be used in the control of the cooling capacity.

Characterized in that the bypass line makes it possible to keep the coolant in the cooling system in motion by providing an alternative flow path in an interruption of the coolant supply to the cooling beam, it is not necessary to turn off the coolant pump at the interruption of the coolant supply. Rather, even if the coolant supply to the cooling beam is interrupted, a predetermined minimum volume flow of coolant, which is conveyed through the coolant pump, can be ensured.

Preferably, the coolant pump is equipped with a frequency-controlled drive. With such a pump, the pumped through the pump coolant flow can be precisely adjusted. Under a coolant pump with frequency-controlled drive, a pump can be understood in which their speed is used as a control variable.

Furthermore, the cooling system can have a plurality of coolant pumps, in particular a plurality of coolant pumps of the previously described type.

A preferred embodiment of the invention provides that the cooling system a coolant reservoir, in particular a High tank, has to store the coolant. It is also expedient if the supply system is connected to the coolant reservoir. Preferably, the supply system, in particular its main line, the input side connected directly to the coolant reservoir or to a connection element of the coolant reservoir. About the supply system, the coolant can be derived from the coolant reservoir.

Furthermore, the connection element of the supply system may be an element of the main line or the distribution line. That is, the bypass line may be connected on the input side, in particular to the main line or the distribution line of the supply system. In the case that the bypass line is connected to the main line, the bypass line is expediently connected to the main line downstream of the aforementioned coolant pump on the input side.

In an advantageous embodiment of the invention, the bypass line is connected on the output side to the coolant reservoir, in particular directly connected to the coolant reservoir. As a result, the coolant flow in the coolant reservoir (back) are performed. This in turn can be achieved that less coolant must be introduced in other ways in the coolant reservoir to replenish it, whereby energy can be saved.

In another advantageous embodiment of the invention it is provided that the bypass line is connected on the output side to a further connection element of the supply system, in particular is connected directly to the further connection element. As a result, the coolant flow into the supply system (back) are performed. As a result, it can also be achieved that less coolant has to be introduced into the coolant reservoir in a different way in order to to replenish it, whereby energy can be saved.

Conveniently, the cooling system is equipped with an additional connection element, which is arranged upstream of the aforementioned coolant pump. A preferred embodiment of the invention provides that the bypass line is connected on the output side to the additional connection element, in particular is connected directly. This additional connection element may e.g. the further mentioned above connecting element of the supply system or a connection element of the coolant reservoir.

Furthermore, it is expedient if the cooling system has a tinder channel and a tinder tank connected to the tundish. Expediently, a fluid introduced into the tundish, in particular the coolant, can flow out of the tinder trough into the tinder settling basin.

In another advantageous variant of the invention, it is provided that the bypass line discharges into the tinder channel on the output side or into the scale settling basin. In this case, the bypass line does not necessarily have to be connected to the tundish or the scale settling tank. Rather, the formulation that "the bypass line on the output side in the tundish or in the Zunderabsetzbecken opens" be understood that the output of the bypass line is arranged such that the coolant flow can flow from the bypass line in the tinder channel or in the scale settling tank. By way of example, the outlet of the bypass line can be arranged above the tundish or the tinder-settling basin.

From the scale settling tank, the coolant contained therein, optionally after it has passed through a treatment plant, in said coolant reservoir and / or in the supply system (back) are performed.

Furthermore, the cooling system may have a further bypass line. Conveniently, the further bypass line is connected on the input side to another connection element of the supply system, in particular directly connected to the other connection element.

Preferably, one of the two bypass lines is connected on the output side to the coolant reservoir or to the further connection element of the supply system. The other of the two bypass lines, however, preferably empties on the output side into the tinder channel or into the scale settling tank.

It is expedient if the cooling system has a shut-off device, in particular a valve, which is arranged in the bypass line. Further, it is expedient if the cooling system has at least one further obturator, in particular a valve, for interrupting a coolant supply to at least one of the cooling bars.

The shut-off device arranged in the bypass line and the further shut-off device advantageously have at least substantially the same switching times. In this way, the opening of the bypass line can be performed synchronously with the interruption of the coolant supply to the chilled beams. Conversely, closing the bypass line thereby can be performed in synchronism with the (re) release of the coolant supply to the chilled beams.

The switching time of a shut-off device can be understood as the time required by the obturator (after issuing a blocking or unlocking command) to completely close a line cross-section of the line in which the obturator is arranged from a fully opened state or to fully open the line cross section from a fully closed state.

Preferably, the further obturator is arranged in the supply system, in particular in the aforementioned main line of the supply system, or in one of the coolant supply lines.

Furthermore, the cooling system may have a plurality of shut-off devices, each of which is arranged to interrupt a coolant supply to at least one of the cooling bars. For several of the chilled beams, a common shut-off device can be provided. Alternatively, a separate shut-off device may be provided for each of the chilled beams. Thus, for example, a shut-off device can be arranged in each of the coolant supply lines.

Conveniently, an additional obturator, in particular a valve, is arranged in the further bypass line. The additional obturator disposed in the further bypass line may be formed identically to the obturator arranged in the first-mentioned bypass line. In particular, the additional shut-off device may have the same switching time as the shut-off element arranged in the first-mentioned bypass line.

Conveniently, the shut-off elements can be controlled or actuated by means of a control device. The respective obturator can be actuated in particular electrically, pneumatically and / or hydraulically. Preferably, the respective shut-off device can not only be completely opened and completely closed, but can also assume intermediate positions, in particular continuous intermediate positions, between these two states. In other words, the shut-off devices can be continuously adjustable.

At least one of the bypass lines may comprise a plurality of line sections, which are connected in parallel with each other. Expediently, the line sections connected in parallel open on the input side into a common line section of the respective bypass line. Furthermore It is expedient if the line sections connected in parallel to one another open into a common line section of the respective bypass line on the output side. In the individual line sections connected in parallel, a shut-off device, in particular a valve, can be arranged in each case. One advantage of such an embodiment is that the shut-off devices - compared to the case where the respective bypass line has a single obturator - can be made relatively small and with short switching times.

Furthermore, the invention relates to a method for operating a cooling system, wherein the cooling system comprises a plurality of cooling bars for applying a coolant to a rolling stock, exactly a separate coolant supply line for each of the cooling bars and a supply system for directing the coolant to the coolant supply lines, each of the chilled beam via its own coolant supply line is connected to the supply system.

According to the invention, it is provided in the method that via a bypass line, which is connected on the input side to a connection element of the supply system, a coolant flow is discharged from the supply system.

The cooling system mentioned in connection with the method can be the cooling system according to the invention, in particular one of its advantageous developments described above. Furthermore, the subject elements mentioned in connection with the method may be the elements already mentioned above.

Appropriately, the coolant flow is discharged in the absence of a rolling stock to be cooled in the cooling system via the bypass line from the supply system.

The coolant flow, which is discharged via the bypass line from the supply system, a partial flow of the Be lead system through-flowing total coolant flow or just said total coolant flow.

Preferably, the coolant flow is discharged via the bypass line from the supply system such that the coolant flow bypasses the coolant supply lines. In other words, preferably, the coolant flow is guided via the bypass line such that the coolant flow, instead of flowing into the supply lines, flows elsewhere, for example into another element of the cooling system or out of the cooling system.

The coolant flow can be conducted from the bypass line, for example into a coolant inlet of the cooling system, which is positioned upstream of a coolant pump arranged in the supply system.

In an advantageous embodiment of the invention, the coolant flow from the bypass line is guided into a coolant reservoir of the cooling system, in particular guided directly into the coolant reservoir. Since this normally no contamination of the coolant takes place, can be dispensed with a preparation of the coolant, so that eliminates an energy requirement for a treatment of the guided into the coolant reservoir coolant.

In another advantageous embodiment of the invention, the coolant flow from the bypass line is returned to the supply system, in particular returned directly to the supply system. The coolant flow is expediently reintroduced into the supply system upstream of a coolant pump arranged in the supply system. In other words, the coolant flow can in particular be returned from the bypass line upstream of an inlet of the coolant pump into the supply system.

An advantageous variant of the invention provides that the coolant flow from the bypass line into a tinder channel or is guided into a scale settling tank of the cooling system, in particular directly into the tinder trough or in the Zunderabsetzbecken is performed. In the event that the refrigerant is fed into the tundish, the refrigerant in the tundish is preferably transferred from the tinder trough to the scale settling tank.

Furthermore, the coolant contained therein can be returned to the coolant reservoir and / or into the supply line system from the scale-down tank. Before the coolant contained in the scale settling tank is led (returned) into the coolant reservoir and / or into the supply system, it may optionally be treated in a treatment plant, in particular cleaned of foreign bodies.

Furthermore, the coolant stream is preferably removed downstream of the coolant pump, in particular between the coolant pump and the coolant supply lines, via the bypass line from the supply line system.

The cooling system may also have another bypass line. This bypass line is expediently connected on the input side to another connection element of the supply system. In a preferred manner, a further coolant flow is removed from the supply system via the further bypass line.

The former coolant flow is advantageously conducted via the first-mentioned bypass line into the coolant reservoir of the cooling system or returned to the supply system, in particular led directly into the coolant reservoir or returned directly into the supply system. In contrast, the further coolant flow is advantageously conducted via the further bypass line in the tinder channel or in the Zunderabsetzbecken the cooling system, in particular led directly into the tinder channel or directly into the Zunderabsetzbecken the cooling system.

The previously given description of advantageous embodiments of the invention includes numerous features, which are given in the individual dependent claims in part to several summarized. However, these features may conveniently be considered individually and combined into meaningful further combinations. In particular, these features can be combined individually and in any suitable combination with the cooling system according to the invention and the method according to the invention. Thus, process features can also be seen as a property of the corresponding device unit and vice versa.

Although some terms are used in the specification or claims in the singular or in conjunction with a number word, the scope of the invention for these terms should not be limited to the singular or the respective number word.

The above-described characteristics, features, and advantages of the invention, as well as the manner in which they will be achieved, will become clearer and more clearly understood in connection with the following description of the embodiments of the invention, which will be described in connection with the drawings. The embodiments serve to illustrate the invention and do not limit the invention to the combinations of features specified therein, not even with respect to functional features. In addition, suitable features of each embodiment may also be explicitly considered isolated, removed from one embodiment, incorporated into another embodiment to supplement it, and combined with any of the claims.

FIG 1

eine Kühlanlage mit einer Bypassleitung, bei der die Bypassleitung eingangsseitig an eine Verteilerleitung angeschlossen ist und ausgangsseitig in ein Zunderabsetzbecken mündet;

FIG 2

eine andere Kühlanlage mit einer Bypassleitung, bei der die Bypassleitung eingangsseitig an eine Verteilerleitung angeschlossen ist und ausgangsseitig an einen Kühlmittelspeicher angeschlossen ist;

FIG 3

eine weitere Kühlanlage mit einer Bypassleitung, bei der die Bypassleitung eingangsseitig an eine Hauptleitung angeschlossen ist und ausgangsseitig an einen Kühlmittelspeicher angeschlossen ist;

FIG 4

noch eine andere Kühlanlage mit einer Bypassleitung, bei der die Bypassleitung sowohl eingangsseitig als auch ausgangsseitig an eine Hauptleitung angeschlossen ist; und

FIG 5

noch eine weitere Kühlanlage mit einer ersten und einer zweiten Bypassleitung, wobei die erste Bypassleitung eingangsseitig an eine Hauptleitung angeschlossen ist und ausgangsseitig an einen Kühlmittelspeicher angeschlossen ist und die zweite Bypassleitung eingangsseitig an eine Verteilerleitung angeschlossen ist und ausgangsseitig in ein Zunderabsetzbecken mündet.

Show it:

FIG. 1

a cooling system with a bypass line, in which the bypass line on the input side to a distribution line is connected and the output side opens into a scale settling tank;

FIG. 2

another cooling system with a bypass line, in which the bypass line is connected on the input side to a distribution line and the output side is connected to a coolant reservoir;

FIG. 3

another cooling system with a bypass line, in which the bypass line is connected on the input side to a main line and the output side is connected to a coolant reservoir;

FIG. 4

yet another cooling system with a bypass line, in which the bypass line is connected both on the input side and on the output side to a main line; and

FIG. 5

Yet another cooling system with a first and a second bypass line, the first bypass line is connected to the input side to a main line and the output side is connected to a coolant reservoir and the second bypass line is connected on the input side to a manifold and the output side opens into a scale settling tank.

FIG. 1 shows a circuit diagram of a cooling system 2 for cooling a (not shown figuratively) hot-rolled rolling stock.

The cooling system 2 comprises a coolant reservoir 4 designed as a high tank for storing a coolant 6. In the present exemplary embodiment, the coolant 6 is water. Furthermore, the cooling system 2 comprises a plurality of cooling bars 8 for applying the coolant 6 to the rolling stock. In addition, the cooling system 2, a supply system 9.

The supply system 9 comprises a first main line 10 and a first distribution line 12. The first main line 10 is connected directly to the coolant reservoir 4 on the input side. On the output side, the first main line 10 is connected directly to the first distribution line 12.

Furthermore, the supply system 9 comprises a second main line 14 and a second distributor line 16. The second main line 14 is connected directly to the coolant reservoir 4 on the input side. On the output side, the second main line 14 is connected directly to the second distribution line 16. Furthermore, the first and the second main line 10, 14 are connected to each other via a connecting line 18.

In addition, the cooling system 2 comprises a coolant pump 20, which is arranged in the second main line 14 and has a frequency-controlled drive. The coolant pump 20 is arranged between a first maintenance flap 22 and a second maintenance flap 24, which are arranged in the second main line 14. Said maintenance flaps 22, 24 are used to isolate the coolant pump 20 for maintenance and / or repair purposes, thereby waiting to be repaired or replaced without having to omit the coolant 6.

In the connecting line 18, which connects the first main line 10 to the second main line 14, a valve designed as a shut-off device 26 is arranged for opening and closing the connecting line 18. In addition, in the second main line 14 between the coolant pump 20 and the second distribution line 16 designed as a valve obturator 28 is arranged for opening and closing the second main line 14.

The cooling bars 8 of the cooling system 2 are arranged along a cooling section 30, through which the rolling stock is led to the cooling, wherein the cooling section 30 in the present Embodiment is divided into a first cooling section 32 and a second cooling section 34.

The terms "first" and "second" in connection with the term "cooling section" serve only to distinguish the two cooling sections 32, 34 of the cooling section 30. The two cooling sections 32, 34 may be arranged so that the rolling stock to be cooled (at least at its first pass through the cooling section 30) first through the first cooling section 32 and then through the second cooling section 34 is guided. Alternatively, the two cooling sections 32, 34 may be arranged so that the rolling stock (at least in its first passage through the cooling section 30), for example, first through the second cooling section 34 and then through the first cooling section 32 is performed. In principle, therefore, the cooling system 2 can be configured such that the second cooling section 34 is arranged in front of or behind the first cooling section 32 in the running direction of the rolling stock.

Furthermore, the cooling system 2 comprises a plurality of coolant supply lines 36 for supplying the cooling bars 8 with the coolant, wherein exactly one separate coolant supply line 36 is provided for each of the cooling bars 8.

Each of the cooling bars 8 of the first cooling section 32 is connected via its own coolant supply line 36 to the first distribution line 12 of the supply system 9. In an analogous manner, each of the cooling bars 8 of the second cooling section 34 is connected via its own coolant supply line 36 to the second distribution line 16 of the supply system 9. The cooling bars 8 of the first cooling section 32 are thus supplied with the coolant 6 via the first distribution line 12, whereas the cooling bars 8 of the second cooling section 34 are supplied with the coolant 6 via the second distribution line 16.

In each of the two cooling sections 32, 34, one half of the cooling bars 8 is adapted to apply the coolant 6 from above to the rolling stock to be cooled, while the other half of the cooling bars 8 is adapted to the coolant 6 from below onto the rolling stock to be cooled applied.

In the present embodiment, all the cooling bars 8 of the second cooling section 34 are cooling bars of the same type. These cooling bars 8 have nozzles from which the coolant 6 exits during cooling operation of the cooling system 2. In contrast, the cooling bars 8 of the first cooling section 32 differ from each other in design. For example, some of the chilled beams 8 of the first cooling path section 32 have gooseneck-like shaped coolant outlet pipes. In principle, all cooling bars 8 of the same design could also be in the first cooling section 32.

Further, a service door 38 is disposed in each of the coolant supply lines 36. In addition, a shut-off device 40 is arranged in each of the coolant supply lines 36, which is designed as a continuously adjustable valve and serves to regulate a coolant flow through the respective coolant supply line 36.

In addition, the cooling system 2 comprises a below the cooling section 30 arranged tundra 42 for collecting the exiting the cooling bar 8 coolant 6 and for collecting scale particles. Furthermore, the cooling system 2 comprises a scale settling basin 44 for scale particle deposition. The Zunderabsetzbecken 44 is connected via a discharge line 46 with the tundish 42, via which introduced into the tundish 42 coolant 6 is passed with the scale particles therein into the Zunderabsetzbecken 44. Furthermore, the cooling system 2, a bypass line 48 and a valve disposed therein 50, which is designed as a continuously adjustable valve.

The bypass line 48 is connected on the input side directly to a connection element 51 of the distribution line 16. On the output side, the bypass line 48 opens into the Zunderabsetzbecken 44. Furthermore, arranged in the bypass line 48 obturator 50 and disposed in the coolant supply lines 36 shut-off elements 40 at least substantially equal switching times.

The second cooling section 34 of the refrigeration system 2 can be operated either in a laminar cooling mode, in a quasi-silacic cooling mode or in an intensive cooling mode.

In the laminar cooling mode, the coolant 6 is led from the coolant reservoir 4 via the first main line 10 to the coolant supply lines 36 of the first cooling section 32 and to the coolant supply lines 36 of the second cooling section 34. The arranged in the connecting line 18 obturator 26 is thereby opened, whereas arranged in the second main line 14 obturator 28 is closed. The coolant pump 20 is turned off in this cooling mode.

In the quasi-silacic cooling mode and in the intensive cooling mode, the coolant 6 is led from the coolant reservoir 4 via the first main line 10 to the coolant supply lines 36 of the first cooling section 32 and via the second main line 14 to the coolant supply lines 36 of the second cooling section 34. The arranged in the connecting line 18 obturator 26 is closed, whereas the arranged in the second main line 14 obturator 28 is opened.

In other words, in the laminar cooling mode, all of the coolant supply lines 36 of the cooling section 30 are over the first Main line 10 supplied with the coolant 6. On the other hand, in the quasi-silacal cooling mode and the intensive cooling mode, only the coolant supply pipes 36 of the first cooling path section 32 are supplied with the coolant 6 via the first main pipe 10, while the coolant supply pipes 36 of the second cooling pipe section 34 are supplied with the coolant 6 via the second main pipe 14.

In Quasilaminarkühlmodus the coolant pump 20 is operated at a speed at which a resulting in the flow of the coolant pump 20 pressure drop in the coolant 6 is at least substantially compensated. In contrast, in the intensive cooling mode by means of the coolant pump 20, the coolant pressure in the second main line 14 is increased beyond the pressure resulting from the coolant reservoir 4.

In each of the three cooling modes, the coolant is applied to the rolling stock by both cooling bars 8 of the first cooling stretch section 32 and cooling bars 8 of the second cooling stretch section 34. The cooling bars 8 of the first cooling section 32 are always supplied via the first main line 10 and not via the second main line 14 with the coolant 6.

If a rolling break is introduced or if the rolling stock is to be cooled by air (instead of via the coolant) while the cooling system 2 is operated in intensive cooling mode, the coolant supply to the cooling bars 8 is interrupted by means of the shut-off elements 40 arranged in the coolant supply lines 36. At the same time arranged in the bypass line 48 obturator 50, the bypass line 48 is released.

In this case, the coolant pump 20 is not switched off, but held in operation in order to avoid a later restart of the coolant pump 20. Optionally, its speed is reduced to reduce the coolant flow through the second main conduit 14.

Via the bypass line 48, a coolant flow is discharged from the second main line 14, so that the coolant flow bypasses the coolant supply lines 36 of the second cooling section 34. That is, the refrigerant flow flows into the bypass passage 48, instead of flowing into said distribution lines 36. By discharging the coolant flow via the bypass line 48 2 pressure surges are avoided or at least reduced in the present cooling system.

In the present embodiment, the coolant flow from the bypass line 48 is not discharged directly from the second main line 14, but via the second main line 14 connected to the second distribution line 16. From the bypass line 48, the coolant flow is performed directly in the Zunderabsetzbecken 44.

From the scale settling tank 44, the coolant 6 therein can be conveyed into the coolant reservoir 4 for reuse, either directly or via a coolant treatment plant (not shown in the figure).

The descriptions of the following embodiments are each limited primarily to the differences from the preceding, in connection with FIG. 1 described embodiment, to which reference is made with respect to the same features and functions. Essentially identical or mutually corresponding elements are, as far as appropriate, designated by the same reference numerals and features not mentioned are taken over in the following exemplary embodiments, without being described again.

FIG. 2 shows another cooling system 2 for cooling hot-rolled rolling stock.

In this exemplary embodiment, the bypass line 48 is connected directly to the coolant reservoir 4 on the output side. Consequently, in the present embodiment the discharged from the second main line 14 via the bypass line 48 coolant flow from the bypass line 48 directly into the coolant reservoir 4 (instead of in the Zunderabsetzbecken 44). Any treatment of the introduced via the bypass line 48 into the coolant reservoir 4 coolant can be omitted here.

FIG. 3 shows a further cooling system 2 for cooling hot-rolled rolling stock.

In this embodiment, the bypass line 48 is connected on the input side directly to a connection element 53 of the second main line 14. Accordingly, in the present case, the coolant flow is discharged via the bypass line 48 directly from the second main line 14.

Furthermore, the bypass line 48 is connected on the output side directly to the coolant reservoir 4. Consequently, in the present embodiment, the discharged from the second main line 14 via the bypass line 48 coolant flow from the bypass line 48 directly into the coolant reservoir 4 (instead of the Zunderabsetzbecken 44) out. Any treatment of the introduced via the bypass line 48 into the coolant reservoir 4 coolant can be omitted here.

Furthermore, it is possible to dispense with switching off the coolant pump 20 when the coolant supply to the cooling beam 8 is interrupted.

FIG. 4 shows yet another cooling system 2 for cooling hot-rolled rolling stock.

In the embodiment of FIG. 4 the bypass line 48 is connected on the input side directly to a connection element 53 of the second main line 14. Accordingly, in the present case, the coolant flow is discharged via the bypass line 48 directly from the second main line 14. Furthermore, the bypass line 48 is connected on the output side to a further connection element 55 of the second main line 14, wherein the first-mentioned connection element 53 of the second main line 14 is arranged downstream of the coolant pump 20 and the further connection element 55 of the second main line 14 is arranged upstream of the coolant pump 20.

In the present embodiment, the discharged from the second main line 14 via the bypass line 48 coolant flow from the bypass line 48 is again directly returned to the second main line 14 (instead of being performed in the Zunderabsetzbecken 44). As long as the obturator 50 of the bypass line 48 is opened and the shut-off elements 40 of the coolant supply lines 36 of the second cooling section 34 are closed, the coolant flow circulates in the bypass line 48 and in the second main line 14 via the coolant pump 20.

FIG. 5 shows yet another cooling system 2 for cooling hot-rolled rolling stock.

In this embodiment, the cooling system 2 comprises an additional bypass line 52 with a shut-off device 54, which is designed as a continuously adjustable valve. This bypass line 52 is connected on the input side directly to a connection element 53 of the second main line 14. On the output side, this bypass line 52 is connected directly to the coolant reservoir 4.

Via the additional bypass line 52, a further coolant flow is discharged from the second main line 14, wherein the further coolant flow from the additional bypass line 52 is guided directly into the coolant reservoir 4.

In order to effectively avoid a surge of pressure when the coolant supply to the chilled beams 8 is interrupted, it is first of all the obturator 50 of the first bypass line 50 is opened. Thereafter, the obturator 54 of the additional bypass line 52 is slowly opened and in turn the obturator 50 of the first bypass line 48 closed again so that no further coolant is introduced into the Zunderabsetzbecken 44, as a return of the introduced into the Zunderabsetzbecken 44 coolant in the coolant reservoir 4 with a higher energy consumption is associated with a direct recycling of the coolant from the second main line 14 into the coolant reservoir 4.

A combination of several bypass lines is also in the embodiments of FIG. 1 to FIG. 4 possible. In particular, in the embodiments of 1 to FIG. 3 in addition to the bypass line 48 respectively disclosed there, a bypass line 48 as in FIG. 1 be provided.

Although the invention has been further illustrated and described in detail by the preferred embodiments, the invention is not limited by the disclosed examples, and other variations can be derived therefrom without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

2

refrigeration Equipment

4

Coolant storage

6

coolant

8th

Chilled beams

9

supply system

10

main

12

distribution line

14

main

16

distribution line

18

connecting line

20

Coolant pump

22

maintenance flap

24

maintenance flap

26

shutoff

28

shutoff

30

cooling section

32

Cooling stretch

34

Cooling stretch

36

supply line

38

maintenance flap

40

shutoff

42

scale trough

44

Zunderabsetzbecken

46

discharge line

48

bypass line

50

shutoff

51

connecting element

52

bypass line

53

connecting element

54

shutoff

55

connecting element

Claims (15)

Cooling system (2) for cooling rolling stock, comprising a plurality of cooling bars (8) for applying a coolant to the rolling stock, exactly a separate coolant supply line (36) for each of the cooling bars (8) and a supply system (9) for directing the coolant to the coolant supply lines (36), wherein each of the cooling bars (8) is connected to the supply system (9) via its own coolant supply line (36),
characterized by a bypass line (48, 52) for discharging a coolant flow from the supply system (9), which on the input side to a connection element (51, 53) of the supply system (9) is connected. Cooling system (2) according to claim 1,
characterized by a coolant reservoir (4), in particular a high tank, for storing the coolant, wherein the supply system (9) is connected to the coolant reservoir (4). Cooling system (2) according to claim 2,
characterized in that the bypass line (48, 52) is connected on the output side to the coolant reservoir (4). Cooling system (2) according to claim 1 or 2,
characterized in that the bypass line (48, 52) is connected on the output side to a further connection element (55) of the supply system (9). Cooling system (2) according to one of the preceding claims, characterized by a coolant pump (20) for increasing a coolant pressure in the supply system (9) and an additional connection element (55), which is arranged upstream of the coolant pump (20), wherein the bypass line (48, 52) is connected on the output side to the additional connection element (55) and the coolant pump (20) has a frequency-controlled drive. Cooling system (2) according to claim 1 or 2,
characterized by a tinder channel (42) and a Zunderabsetzbecken (44) connected to the tundra (42), wherein the bypass line (48, 52) on the output side in the tundish (42) or in the Zunderabsetzbecken (44) opens. Cooling system (2) according to one of the preceding claims, characterized by a coolant reservoir (4), to which the supply system (9) is connected, a tundish (42), a Zundabsetzbecken (44) connected to the tundish (42) and a further bypass line (48, 52), the input side to another connection element (51, 53) of the supply system (9) is connected, wherein one of the two bypass lines (48, 52) on the output side to the coolant reservoir (4) or to a further connection element (55) the supply line (9) is connected and the other of the two bypass lines (48, 52) on the output side in the tundish (42) or in the Zunderabsetzbecken (44) opens. Cooling system (2) according to one of the preceding claims, characterized by a shut-off device (50, 54), which is arranged in the bypass line (48, 52), and at least one further obturator (40) for interrupting a coolant supply to at least one of the cooling bars ( 8th). Cooling system (2) according to claim 8,
characterized in that in the bypass line (48, 52) arranged obturator (50, 54) and the further obturator (40) have at least substantially the same switching times. Cooling system (2) according to claim 8 or 9,
characterized in that the further obturator (40) in the supply system (9) or in one of the coolant supply lines (36) is arranged. Method for operating a cooling system (2), in particular a cooling system (2) according to one of the preceding claims, in which the cooling system (2) has a plurality of cooling bars (8) for applying a coolant to a rolling stock, exactly one separate coolant supply line (36) for each the cooling beam (8) and a supply system (9) for directing the coolant to the coolant supply lines (36), each of the cooling bars (8) being connected to the supply system (8) via its own coolant supply line (36),
characterized in that via a bypass line (48, 52), the input side to a connection element (51, 53) of the supply system (9) is connected, a coolant flow from the supply system (9) is discharged. Method according to claim 11,
characterized in that the coolant flow from the bypass line (48, 52) is guided directly into a coolant reservoir (4) of the cooling system (2). Method according to claim 11,
characterized in that the coolant flow from the bypass line (48, 52) is fed back directly into the supply system (9), wherein the coolant flow is reintroduced into the supply system (9) upstream of a coolant pump (20) arranged in the supply system (9). Method according to claim 11,
characterized in that the coolant flow from the bypass line (48, 52) directly into a tinder channel (42) or in a Zunderabsetzbecken (44) of the cooling system (2) is guided. Method according to claim 11,
characterized in that the cooling system (2) has a further bypass line (48, 52), the input side to another connection element (51, 53) of the supply system (9) is connected and via which a further coolant flow is discharged from the supply system (9), wherein - The first-mentioned coolant flow through the first-mentioned bypass line (48, 52) is guided directly into a coolant reservoir (4) of the cooling system (2) or directly into the supply system (9) is returned and - The further coolant flow through the further bypass line (48, 52) directly into a tinder channel (42) or in a Zunderabsetzbecken (44) of the cooling system (2) is guided.

Images