EP3554727B2 - Cooling system for cooling rolling stock - Google Patents

Description

The invention relates to a cooling system for cooling rolling stock, which comprises a plurality of cooling beams for applying a coolant to the rolling stock, exactly one coolant supply line for each of the cooling beams and a feed system for guiding the coolant to the coolant supply lines, each of the cooling beams having its own coolant supply line 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. Using the cooling beams, a coolant, usually water, is then applied to the rolling stock.

Particularly in so-called hot rolling, a defined cooling of the rolling stock is of central importance in order to achieve the 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 beams is usually interrupted. One or more shut-off devices of the cooling system are typically used to interrupt the coolant supply.

From the JP S54 79817 A , the JP S62 67605 U and the JP S52 56052 A Various cooling systems for cooling rolling stock are known, which include several cooling beams or coolant nozzles for applying coolant to the rolling stock, coolant supply lines and supply systems for guiding coolant to the coolant supply lines. The preamble of claim 1 is based on the JP S54 79817 A .

One object of the invention is to provide an improved cooling system for cooling rolled stock.

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

The cooling system according to the invention comprises several cooling beams for applying a coolant to the rolling stock. In addition, the cooling system includes exactly one coolant supply line for each of the cooling beams. This means that the cooling system has several coolant supply lines, with exactly one coolant supply line being provided for each of the cooling beams. Furthermore, the cooling system includes a supply system for guiding the coolant to the coolant supply lines.

Furthermore, in the cooling system it is provided that each of the cooling beams is connected to the supply system via its own coolant supply line. In other words, each of the cooling beams is connected to the supply line system via exactly one coolant supply line that is assigned to the respective cooling beam or is intended for it.

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

Furthermore, the cooling system has a coolant storage to which the supply line system is connected, a scale trough, a scale settling tank connected to the scale trough and a further bypass line, which is connected on the input side to another connection element of the supply line system, one of the two bypass lines being connected to the coolant storage on the output side or is connected to a further connection element of the supply line system and the other of the two bypass lines opens into the scale channel or into the scale settling basin on the output side.

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

The invention is based on the idea that if the coolant supply is quickly interrupted, pressure surges can occur in the cooling system, in particular in its lines, which can, under certain circumstances, damage components of the cooling system and possibly lead to a 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 there are usually higher coolant pressures in the lines of the cooling system than when the cooling system is operated in the so-called laminar cooling mode.

The invention allows the coolant to flow out of the supply system via the bypass line if the coolant supply to the cooling beams is interrupted. The bypass line therefore provides the coolant with an alternative flow path. In this way, pressure surges in the cooling system can be avoided or at least reduced when the coolant supply to the cooling beams is interrupted. This in turn means that components of the cooling system can be protected and their service life can be increased. The bypass line is expediently released if the coolant supply to the cooling beams is interrupted.

Because the bypass line is connected to a connection element of the supply line system, several cooling beams can be bridged at once via the bypass line, i.e. several cooling beams with the same bypass line. A separate bypass line for each of the coolant supply lines - and possibly a separate shut-off device for each such bypass line - is therefore not required. This enables a structurally simple and cost-effective design of the cooling system. In addition, this enables simple control technology operation of the cooling system.

In the sense of the invention, the line can be used in particular a pipe, a pipe section or a system of interconnected pipes can be understood.

The term “connected” can be understood as a shortened form of the expression “fluid-technically connected”. An element of the cooling system can be considered to be connected to another element of the cooling system if a fluid, in particular the aforementioned 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 to mean applying the coolant to a surface of the rolling stock. The coolant can be applied to the rolling stock from one or more sides. The coolant is preferably applied to the rolling stock from above and below.

The bypass line is preferably connected directly to the connection element of the supply line system. This means that the bypass line can be connected directly to the supply system.

The respective coolant supply line (on the output side) is expediently connected directly to the cooling beam assigned to it. In the present case, a coolant supply line can be understood as a line that supplies exactly one of the cooling beams with the coolant. It is further preferred if the respective cooling beam is connected to the supply system exclusively via its own coolant supply line. Preferably, the respective coolant supply line (on the input side) is directly connected to the supply line system.

All of the previously mentioned cooling beams are preferably supplied with the coolant via the supply system. The supply system can include one or more lines. Preferably, the supply system comprises at least one main line and at least one distribution line. The main line is expediently connected directly or indirectly to the distribution line on the output side.

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

The cooling system advantageously 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 wording that the coolant pump is expediently arranged in the main line is not necessarily to be understood as meaning that the coolant pump is enclosed by the main line in such an arrangement. For example, the main line can have a first line section that is connected to an inlet of the coolant pump. In addition, the main line can have a second line section that is connected to an output 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, can be used to control the cooling capacity.

Because the bypass line makes it possible to keep the coolant moving in the cooling system by providing an alternative flow path when the coolant supply to the cooling beams is interrupted, it is not necessary to switch off the coolant pump when the coolant supply is interrupted. Rather, even if the coolant supply to the cooling beams is interrupted, a predetermined minimum volume flow of coolant, which is conveyed by the coolant pump, can be ensured.

The coolant pump is preferably equipped with a frequency-controlled drive. With such a pump, the coolant volume flow delivered by the pump can be precisely adjusted. A coolant pump with a frequency-controlled drive can be understood as a pump in which its speed serves as a controlled variable.

Furthermore, the cooling system can have several coolant pumps, in particular several coolant pumps of the type described above.

A preferred development of the invention provides that the cooling system has a high tank for storing the coolant.

The feed system, in particular its main line, is preferably connected on the input side directly to the coolant storage or to a connection element of the coolant storage. The coolant can be drained from the coolant storage via the supply system.

Furthermore, the connection element of the feed system can be an element of the main line or the distribution line. This means that the bypass line can 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 on the input side downstream of the aforementioned coolant pump.

In an advantageous embodiment of the invention, the bypass line is connected to the coolant storage on the output side, in particular connected directly to the coolant storage. This allows the coolant flow to be (returned) to the coolant storage. This in turn means that less coolant has to be introduced into the coolant reservoir in other ways in order to refill it, which means 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 line system, in particular is connected directly to the further connection element. This allows the coolant flow to be (returned) into the supply system. This also means that less coolant has to be introduced into the coolant storage by other means in order to refill it, which means energy can be saved.

The cooling system is expediently 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 can be, for example, the further connection element of the supply line system mentioned above or a connection element of the coolant storage.

A fluid introduced into the scale trough, in particular the coolant, can expediently flow out of the scale trough into the scale settling tank.

In another advantageous variant of the invention it is provided that the bypass line opens into the scale channel or into the scale settling basin on the output side. The bypass line does not necessarily have to be connected to the scale trough or the scale settling tank. Rather, the formulation that "the bypass line opens into the scale trough or into the scale settling tank on the output side" can be understood to mean that the outlet of the bypass line is arranged in such a way that the coolant flow can flow out of the bypass line into the scale trough or into the scale settling tank. For example, the outlet of the bypass line can be arranged above the scale trough or the scale settling tank.

The coolant contained therein can be (returned) from the scale settling tank, if necessary after it has passed through a processing plant, into said coolant storage and/or into the supply system.

The further bypass line is expediently connected directly to the other connection element on the input side.

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

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

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

The further shut-off element is preferably arranged in the feed system, in particular in the aforementioned main line of the feed system, or in one of the coolant supply lines.

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

An additional shut-off device, in particular a valve, is expediently arranged in the further bypass line. The additional shut-off device arranged in the further bypass line can be designed identically to the shut-off device arranged in the first-mentioned bypass line. In particular, the additional shut-off device can have the same switching time as the shut-off device arranged in the first-mentioned bypass line.

The shut-off devices can expediently be controlled or actuated using a control device. The respective shut-off device can in particular be actuated electrically, pneumatically and/or hydraulically. Preferably, the respective shut-off element 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 can comprise several line sections which are connected in parallel to one another. The line sections connected in parallel to one another expediently open on the input side into a common line section of the respective bypass line. In addition, it is expedient if the line sections connected in parallel to one another open on the output side into a common line section of the respective bypass line. A shut-off device, in particular a valve, can be arranged in each of the individual line sections connected in parallel to one another. An advantage Such an embodiment is that the shut-off devices - compared to the case where the respective bypass line has a single shut-off device - can be designed to be relatively small and with short switching times.

The invention further relates to a method for operating a cooling system.

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

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

The first-mentioned coolant flow is guided via the first-mentioned bypass line into the coolant storage of the cooling system or returned into the supply system, in particular led directly into the coolant storage or returned directly into the supply system. In contrast, the further coolant flow is advantageously guided via the further bypass line into the scale trough or into the scale settling basin of the cooling system, in particular directly into the scale trough or directly into the scale settling basin of the cooling system.

If there is no rolling stock to be cooled in the cooling system, the coolant flow is expediently discharged from the supply system via the bypass line.

The coolant flow, which is discharged from the supply line system via the bypass line, can be a partial flow of a total coolant flow flowing through the supply system or of said total coolant flow.

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

The coolant flow can be guided 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 line system.

In an advantageous embodiment of the invention, the coolant flow is led from the bypass line directly into the coolant storage. Since there is normally no contamination of the coolant, there is no need to process the coolant, so that there is no energy requirement for processing the coolant fed into the coolant storage.

In another advantageous embodiment of the invention, the coolant flow from the bypass line is returned directly to the supply line 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 into the supply line system in front of an inlet of the coolant pump.

An advantageous variant of the invention provides that the further coolant flow from the further bypass line is led directly into the scale channel or into the scale settling tank. In the event that the coolant is fed into the scale trough, the coolant located in the scale trough is preferably forwarded from the scale trough into the scale settling tank.

The coolant contained therein can also be (returned) from the scale settling tank into the coolant storage and/or into the supply system. Before the coolant located in the scale settling tank is (returned) to the coolant storage and/or into the supply system, it can optionally be processed in a processing plant, in particular cleaned of foreign bodies.

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

The description given so far of advantageous embodiments of the invention contains numerous features, some of which are summarized into several in the individual dependent patent claims. However, these features can also be conveniently considered individually and combined into further sensible 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. Process features can also be seen as properties of the corresponding device unit and vice versa.

Even if some terms in the description or in the patent claims are used 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 properties, features and advantages of the invention described above and the manner in which these are achieved will be more clearly and clearly understood in connection with the following description of embodiments of the invention according to the invention and not according to the invention, which are explained in more detail in connection with the drawings and where FIG 1 to FIG 4 are exemplary embodiments not according to the invention, which serve to explain individual features, while Figure 5 represents an exemplary embodiment according to the invention. The exemplary embodiments serve to explain the invention and do not limit the invention to the combinations of features specified therein, not even with regard to functional features. In addition, suitable features of each exemplary embodiment can also be explicitly considered in isolation, removed from one exemplary embodiment, introduced into another exemplary embodiment to supplement it and combined with any of the claims.

FIG 1

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

FIG 2

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

FIG 5

eine erfindungsgemäße 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 not according to the invention with a bypass line, in which the bypass line is connected on the input side to a distribution line and on the output side opens into a scale settling tank;

FIG 2

another cooling system not according to the invention with a bypass line, in which the bypass line is connected on the input side to a distribution line and on the output side is connected to a coolant storage;

FIG 3

a further cooling system not according to the invention with a bypass line, in which the bypass line is connected on the input side to a main line and on the output side is connected to a coolant storage;

FIG 4

yet another cooling system not according to the invention with a bypass line, in which the bypass line is connected to a main line on both the input and output sides; and

FIG 5

a cooling system according to the invention with a first and a second bypass line, wherein the first bypass line is connected on the input side to a main line and on the output side is connected to a coolant storage and the second bypass line is connected on the input side to a distribution line and opens on the output side into a scale settling tank.

FIG 1 shows a circuit diagram of a cooling system 2 for cooling a hot-rolled rolling stock (not shown in the figure). The cooling system 2 includes a coolant storage 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 includes several cooling beams 8 for applying the coolant 6 to the rolling stock. In addition, the cooling system 2 has a supply system 9.

The supply system 9 includes a first main line 10 and a first distribution line 12. The first main line 10 is connected directly to the coolant storage 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 includes a second main line 14 and a second distribution line 16. The second main line 14 is connected directly to the coolant storage 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 second main lines 10, 14 are connected to one another via a connecting line 18.

In addition, the cooling system 2 includes 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 serve to isolate the coolant pump 20 for maintenance and/or repair purposes and thereby be able to service, repair or replace without having to let out the coolant 6.

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

The cooling beams 8 of the cooling system 2 are arranged along a cooling section 30 through which the rolling stock is guided to cool it, the cooling section 30 being divided into a first cooling section section 32 and a second cooling section section 34 in the present exemplary embodiment.

The terms “first” and “second” in conjunction with the term “cooling section” only serve to distinguish the two cooling section sections 32, 34 of the cooling section 30. The two cooling section sections 32, 34 can be arranged in such a way that the rolling stock to be cooled (at least at its first pass through the cooling section 30) is guided first through the first cooling section section 32 and then through the second cooling section section 34. Alternatively, the two cooling section sections 32, 34 can be arranged in such a way that the rolling stock (at least during its first pass through the cooling section 30) is guided, for example, first through the second cooling section section 34 and then through the first cooling section section 32. In principle, the cooling system 2 can be designed in such a way that the second cooling section 34 is arranged in front of or behind the first cooling section 32 in the direction of travel of the rolling stock.

Furthermore, the cooling system 2 includes a plurality of coolant supply lines 36 for supplying the cooling beams 8 with the coolant, with exactly one coolant supply line 36 being provided for each cooling beam 8.

Each of the cooling beams 8 of the first cooling section 32 is connected to the first distribution line 12 of the supply line system 9 via its own coolant supply line 36. In an analogous manner, each of the cooling beams 8 of the second cooling section 34 is connected to the second distribution line 16 of the supply system 9 via its own coolant supply line 36. The cooling beams 8 of the first cooling section 32 are thus supplied with the coolant 6 via the first distribution line 12, whereas the cooling beams 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 section sections 32, 34, one half of the cooling beams 8 is set up to apply the coolant 6 to the rolling stock to be cooled from above, while the other half of the cooling beams 8 is set up to apply the coolant 6 to the rolling stock to be cooled from below to apply.

In the present exemplary embodiment, all cooling beams 8 of the second cooling section section 34 are cooling beams of the same design. These cooling beams 8 have nozzles from which the coolant 6 emerges during cooling operation of the cooling system 2. In contrast, the cooling beams 8 of the first cooling section 32 differ from one another in terms of their design. For example, some of the cooling beams 8 of the first cooling section 32 have coolant outlet pipes shaped like a gooseneck. In principle, all cooling beams 8 in the first cooling section 32 could also be of the same design.

Furthermore, a maintenance flap 38 is arranged in each of the coolant supply lines 36. In addition, a shut-off element 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 includes a scale channel 42 arranged below the cooling section 30 for collecting the coolant 6 emerging from the cooling beams 8 and for collecting scale particles. Furthermore, the cooling system 2 includes a scale settling tank 44 for depositing scale particles. The scale settling tank 44 is connected to the scale settling tank 42 via a discharge line 46, via which coolant 6 introduced into the scale channel 42 with the scale particles contained therein is passed into the scale settling tank 44.

Furthermore, the cooling system 2 has a bypass line 48 and a shut-off element 50 arranged therein, 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 scale settling tank 44. Furthermore, the shut-off device 50 arranged in the bypass line 48 and the shut-off devices 40 arranged in the coolant supply lines 36 have at least essentially the same switching times.

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

In the laminar cooling mode, the coolant 6 is conducted from the coolant storage 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 shut-off device 26 arranged in the connecting line 18 is open, whereas the shut-off device 28 arranged in the second main line 14 is closed. The coolant pump 20 is switched off in this cooling mode.

In the quasi-laminar cooling mode and in the intensive cooling mode, the coolant 6 is passed from the coolant storage 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 shut-off device 26 arranged in the connecting line 18 is closed, whereas the shut-off device 28 arranged in the second main line 14 is open.

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

In the quasi-laminar cooling mode, the coolant pump 20 is operated at a speed at which a pressure drop in the coolant 6 that occurs when flow through the coolant pump 20 is at least substantially compensated for. In contrast, in the intensive cooling mode, the coolant pressure in the second main line 14 is increased above the pressure resulting from the coolant storage 4 using the coolant pump 20.

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

If a rolling break is taken or if the rolling stock is to be cooled via air (instead of via the coolant) while the cooling system 2 is operated in intensive cooling mode, the coolant supply to the cooling beams 8 is interrupted using the shut-off devices 40 arranged in the coolant supply lines 36. At the same time, the shut-off element 50 arranged in the bypass line 48 releases the bypass line 48.

The coolant pump 20 is not switched off but is kept in operation in order to avoid the coolant pump 20 starting up again later. If necessary, their speed is reduced in order to reduce the coolant flow through the second main line 14.

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

In the present exemplary embodiment, the coolant flow from the bypass line 48 is not discharged directly from the second main line 14, but rather via the second distribution line 16 connected to the second main line 14. From the bypass line 48, the coolant flow is led directly into the scale settling tank 44.

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

The descriptions of the following exemplary embodiments are primarily limited to the differences from the previous one in connection with FIG 1 described embodiment, to which reference is made with regard to consistent features and functions. Essentially the same or corresponding elements are, where appropriate, designated with the same reference numerals and features not mentioned are adopted 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 storage 4 on the output side. Consequently, in the present exemplary embodiment, the coolant flow discharged from the second main line 14 via the bypass line 48 is led from the bypass line 48 directly into the coolant storage 4 (instead of into the scale settling tank 44). Any processing of the coolant introduced into the coolant storage 4 via the bypass line 48 can be omitted here.

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

In this exemplary 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 directly from the second main line 14 via the bypass line 48.

Furthermore, the bypass line 48 is connected directly to the coolant storage 4 on the output side. Consequently, in the present exemplary embodiment, the coolant flow discharged from the second main line 14 via the bypass line 48 is led from the bypass line 48 directly into the coolant storage 4 (instead of into the scale settling tank 44). Any processing of the coolant introduced into the coolant storage 4 via the bypass line 48 can be omitted here.

Furthermore, it is not necessary to switch off the coolant pump 20 if the coolant supply to the cooling beams 8 is interrupted.

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

In the exemplary embodiment FIG 4 the bypass line 48 is connected on the input side directly to a connecting element 53 of the second main line 14. Accordingly, in the present case, the coolant flow is discharged directly from the second main line 14 via the bypass line 48.

Furthermore, the bypass line 48 is connected on the output side to a further connection element 55 of the second main line 14, the first-mentioned connection element 53 of the second main line 14 being arranged downstream of the coolant pump 20 and the further connection element 55 of the second main line 14 being arranged upstream of the coolant pump 20.

In the present exemplary embodiment, the coolant flow discharged from the second main line 14 via the bypass line 48 is returned from the bypass line 48 directly into the second main line 14 (instead of being led into the scale settling tank 44). As long as the shut-off device 50 of the bypass line 48 is open and the shut-off devices 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 exemplary embodiment, the cooling system 2 includes an additional bypass line 52 with a shut-off element 54, which is designed as a continuously adjustable valve. This bypass line 52 is directly connected to a connection element on the input side 53 of the second main line 14 connected. On the output side, this bypass line 52 is connected directly to the coolant storage 4.

A further coolant flow is discharged from the second main line 14 via the additional bypass line 52, with the further coolant flow being guided from the additional bypass line 52 directly into the coolant storage 4.

In order to effectively avoid a pressure surge when the coolant supply to the cooling beams 8 is interrupted, the shut-off device 50 of the first bypass line 50 is first opened. The shut-off device 54 of the additional bypass line 52 is then slowly opened and in return the shut-off device 50 of the first-mentioned bypass line 48 is closed again so that no further coolant is introduced into the scale settling tank 44, since the coolant introduced into the scale settling tank 44 is returned to the coolant storage 4 involves a higher energy expenditure than returning the coolant directly from the second main line 14 into the coolant storage 4.

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

Reference symbol list

2

Cooling system

4

Coolant storage

6

coolant

8th

Chilled beams

9

supply system

10

main line

12

distribution line

14

main line

16

distribution line

18

connecting line

20

coolant pump

22

Maintenance hatch

24

Maintenance hatch

26

Shut-off device

28

Shut-off device

30

cooling section

32

Cooling section

34

Cooling section

36

supply line

38

Maintenance hatch

40

Shut-off device

42

Tinder gutter

44

Tinder settling tank

46

discharge line

48

Bypass line

50

Shut-off device

51

Connection element

52

Bypass line

53

Connection element

54

Shut-off device

55

Connection element

Claims (13)

1. Cooling system (2) for cooling rolling stock, comprising

   - a plurality of cooling bars (8) for applying a coolant to the rolling stock,

   - exactly one dedicated coolant supply line (36) for each of the cooling bars (8),

   - a feed line system (9) for directing the coolant to the coolant supply lines (36), wherein each of the cooling bars (8) is connected to the feed line system (9) by way of its dedicated coolant supply line (36),

   - a bypass line (48, 52) for discharging a coolant flow from the feed line system (9), which is connected on the input side to a connection element (51, 53) of the feed line system (9),

   - a coolant reservoir (4), to which the feed line system (9) is connected,

   - a scale channel (42),

   - a scale settling tank (44) connected to the scale channel (42),

   - a coolant pump (20) for increasing a coolant pressure in the feed line system (9), and

   - a further bypass line (48, 52), which is connected on the input side to another connection element (51, 53) of the feed line system (9), wherein one of the two bypass lines (48, 52) is connected on the output side to the coolant reservoir (4) or to a further connection element (55) of the feed line system (9) that is arranged upstream of the coolant pump (20), and the other of the two bypass lines (48, 52) opens out on the output side into the scale channel (42) or into the scale settling tank (44) .
2. Cooling system (2) according to Claim 1,
   characterized in that the coolant reservoir (4) is an elevated tank.
3. Cooling system (2) according to Claim 1 or 2,
   characterized in that the bypass line (48, 52) is connected on the output side to the coolant reservoir (4).
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 the further connection element (55) of the feed line system (9).
5. Cooling system (2) according to one of the preceding claims, characterized in that the coolant pump (20) has a frequency-controlled drive.
6. Cooling system (2) according to Claim 1 or 2,
   characterized in that the bypass line (48, 52) opens out on the output side into the scale channel (42) or into the scale settling tank (44).
7. Cooling system (2) according to one of the preceding claims, characterized by a shut-off member (50, 54), which is arranged in the bypass line (48, 52), and at least one further shut-off member (40) for interrupting a coolant feed to at least one of the cooling bars (8).
8. Cooling system (2) according to Claim 7,
   characterized in that the shut-off member (50, 54) arranged in the bypass line (48, 52) and the further shut-off member (40) have at least substantially the same switching times.
9. Cooling system (2) according to Claim 7 or 8,
   characterized in that the further shut-off member (40) is arranged in the feed line system (9) or in one of the coolant supply lines (36).
10. Method for operating a cooling system (2) according to one of the preceding claims,
    characterized in that

    - by way of the bypass line (48, 52), which is connected on the input side to the connection element (51, 53) of the feed line system (9), a coolant flow is discharged from the feed line system (9),

    - the coolant flow is sent by way of the bypass line (48, 52) into the coolant reservoir (4) of the cooling system (2) or is sent back into the feed line system (9) upstream of the coolant pump (20), and

    - a further coolant flow is sent by way of the further bypass line (48, 52) into the scale channel (42) or into the scale settling tank (44) of the cooling system (2).
11. Method according to Claim 10,
    characterized in that the coolant flow from the bypass line (48, 52) is sent directly into the coolant reservoir (4) of the cooling system (2).
12. Method according to Claim 10,
    characterized in that the coolant flow from the bypass line (48, 52) is sent back directly into the feed line system (9), wherein the coolant flow is reintroduced into the feed line system (9) upstream of the coolant pump (20) arranged in the feed line system (9).
13. Method according to Claim 10,
    characterized in that the further coolant flow from the further bypass line (48, 52) is sent directly into a scale channel (42) or into a scale settling tank (44) of the cooling system (2).

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