KR20150041155A - Method and device for dynamically supplying coolant to a cooling device for cooling metal strip or other rolled stock - Google Patents

Abstract

The present invention relates to a cooling device for cooling metal strips or other rolling stock, and more particularly to a method for dynamically feeding one or more spray bar precursors. According to the above method, a pre-accelerated coolant flow is provided which bypasses the cooling device 1 and is directed into the recovery part 3. [ In addition, the presence and / or the temperature of the metal strip or other rolling stock to be cooled is monitored and the coolant flow towards the cooling device 1 is deflected according to the presence and / or temperature of the metal strip or other rolled stock, The flow is supplied to the cooling device 1 for cooling the metal strip or other rolling stock instead of being guided into the recovery part 3 by bypassing the cooling device 1. [ The invention also relates to corresponding apparatus for carrying out the method of the present invention.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a coolant dynamic supply method and apparatus for dynamically supplying a coolant with a cooling device for cooling a metal strip or other rolled stock,

The present invention relates to a method and apparatus for dynamically feeding a coolant to a cooling device for cooling metal strips or other rolled stock. The cooling device may in particular comprise one or a plurality of spray bars.

From the prior art, a number of systems for feeding cooling water from deep tanks for laminar or pressure cooling in hot rolling mill rows are already known. For cooling the hot rolled stock, a considerable amount of cooling water is required to rapidly cool the strip in a well defined manner in accordance with the respective requirements of the product to be manufactured. The quantity required to achieve a given cooling rate is usually transferred to the hundreds or even thousands of cubic meters per hour of magnitude. Such a great deal of water is directed from the deep tank to the spray bars through, for example, flow-adjustable line systems through the valves.

The system according to the prior art is shown in Fig. 1 as an example. The water stored in the deep tank (4) is supplied to the central distributor (6) through the lines (2). From this common distributor 6, water is supplied to the individual spray bars 1 via additional lines. However, this known arrangement leads to several disadvantages. For today's metal alloys or steels, high cooling rates should likewise be set and adjusted as accurately as possible. However, this is difficult because of the large quantity used. In particular, activation and deactivation processes through existing concepts, including most control valves, can not be performed satisfactorily quickly, so that the activation process of cooling often takes more than 10 seconds to achieve the desired cooling rate. In many cases, however, since the rolled stock is moved through the machine at a speed of several meters per second, the long strip length is not cooled to the desired cooling rate, resulting in a quality loss of the corresponding strip section.

A further disadvantage lies in the high force acting on the line systems or cooling systems during the cooling switching processes. During the rapid switching process of cooling water supply in particular, there is a risk that strong pressure shocks will damage the cooling system. These pressure peaks can even lead to failure of the cooling system and thus of the entire rolling mill.

In view of the above-described prior art, the technical problem of the present invention is to provide an improved coolant supply that prevents, or at least significantly reduces, pressure shocks, especially during activation processes. The technical problem also may be in achieving the desired cooling rate more quickly than ever before, in order to supply the coolant at the best possible conditions with the rolled strip.

The technical problem is solved by means of the features of a cooling device for cooling a metal strip or other rolling stock, in particular a method for dynamically feeding at least one spray bar coolant, according to claim 1. In this case, the method of the present invention comprises the steps of at least introducing a pre-accelerated or flowing coolant stream while guiding the coolant stream bypassing the cooling device and into the return, and determining the presence of the metal strip or other rolled stock to be cooled And / or monitoring the temperature. According to the invention, the pre-accelerated coolant flow to the cooling device is diverted or deflected according to the presence and / or the temperature of the metal strip or other rolled stock, and the coolant flow bypasses the cooling device Instead of being guided into the recovery section, it is supplied in a pre-accelerated state with a cooling device for cooling the metal strip or other rolling stock.

Through pre-accelerating the coolant and redirecting or deflecting this pre-accelerated coolant flow, the pressure impact acting on the equipment components can be prevented or greatly reduced. Also, the reaction time of cooling is clearly improved. The deflection process can be performed much more quickly than the process of accelerating distant and sequential quantities. In addition, a faster and more accurate target cooling rate can be achieved and set. Therefore, the adjustability of the generally used volumetric flow rate is improved.

According to a preferred embodiment, the pressure drop when supplying the pre-accelerated coolant flow to the cooling device and the pressure drop of the pre-accelerated coolant flow when bypassing the cooling device is less than 50%, preferably less than 20% Less than 10%. Preferably the two values are substantially the same. Thus, by deflecting the coolant flow, the pressure shock of the coolant flow is prevented when deflecting the coolant flow to supply the coolant flow to the cooler. In other words, the flow resistance for the coolant flow when bypassing or guiding the cooling device to the cooling device is substantially equal, or less than the value specified above.

The deflection process is preferably initiated to less than 5s, or even less than 1.5s. If the conversion time is thus relatively short, the method according to the invention is particularly preferred.

According to a preferred embodiment, the deflection of the coolant flow is carried out at a position less than 5 m, preferably less than 1 m upstream of the cooling device 1 (whereby the position of the deflection 5 and the cooling device 1 The path of the coolant flow between the outlets 7 of the heat exchanger 10 is kept as small as possible.

According to a further preferred embodiment, the volume flow rate of the refrigerant or coolant stream to be deflected is at least 150 m 3 / h, preferably at least 400 m 3 / h. The present invention is particularly preferred when considering such a high volume flow rate.

The invention also likewise relates to an apparatus for cooling metal strips, preferably for carrying out the method according to any of the method-related claims. The apparatus includes a cooling device for cooling a metal strip or other rolled stock first, the cooling device comprising at least one spray bar comprising coolant outlets for discharging the coolant onto the metal strip. The apparatus also includes bypass means for directing coolant flow from the line means into the recovery portion, as well as line means for directing coolant flow directly from the coolant source to the spray. The open-close direction switching means of the apparatus of the present application is configured to openably and / or indirectly guide the spray coolant flow through the line means, or to direct the coolant flow from the line means into the detour means.

Advantages of the apparatus of this application substantially correspond to the advantages of the method already described.

In a preferred embodiment, the apparatus may comprise one or more valves for setting the volumetric flow rate of the coolant flow flowing through the line means, and the redirection means are disposed downstream of the control valve.

In a further preferred embodiment, the opening and closing redirection means may comprise one or more openable flaps for guiding the coolant flow towards the spray bars or into the detour means, respectively.

Further, in a further preferred embodiment, the line means also comprise a pump for increasing the volumetric flow rate supplied from the source. With such a pump, a much stronger pre-accelerated volumetric flow rate can be supplied.

In a further preferred embodiment, the pump can be bypassed by bypassing the coolant flow. With this arrangement, it is possible to cool using the coolant pressure available without each pump. The water pressure may be provided, for example, through a high-level tank.

As a result, the supply of very small volumetric flow rates (eg laminar flow mode) and the provision of very large volumetric flow rates to the same extent (pump operating mode of pressure) are possible as a whole.

In a further preferred embodiment, a plurality of spray bars, preferably up to 10 spray bars, may be incorporated into the first cooling group, the first cooling group may be supplied with coolant through the first line means, Open directional switching means are provided for guiding the coolant flow in the first line means into the recovery section for each of the three spray bars of each of the group of spray bars so that the coolant flow of the top three spray bars of the first cooling group May be detached from the remaining spray bars of the first cooling group, into the detour means, or into the collection portion.

In a further preferred embodiment, a plurality of additional spray bars, preferably up to 10 additional spray bars, may be incorporated into the second cooling group, the second cooling group may be supplied with coolant through the second line means, 2 directional switching means are provided for guiding the coolant flow from the second line means into the recovery section for each of the top three spray bars of the two cooling groups of the spraying bars so that up to three spray bars of the second cooling group The coolant flow may be separated from the remaining spray bars of the second cooling group, into the detour means, or into the collection portion.

In a further preferred embodiment, the first cooling group and the second cooling group may be separated from each other to receive or feed the coolant through the source.

In a further preferred embodiment, the volume flow towards each individual cooling group may be separately increased through the pump.

In a further preferred embodiment, the apparatus comprises a plurality of spray bars, wherein each spray bar is separated from the additional spray bars and is assigned one openable redirection means, whereby each spray bar is pre- The flow can be supplied through the line means, or the coolant flow can be supplied to the bypass means through the redirection means assigned to the spray bar.

In a further preferred embodiment, one or more spray bars of the spray bars are supported through a support device, and the openable / deflecting means are mounted on the support device. In a manner such that it is replaced or added, the opening and closing redirection means is disposed at a position less than 5 m, preferably less than 3 m, upstream of the spray bar.

All features of the embodiments described above may be combined or interchanged with one another.

The figures of the embodiments are briefly described below. Additional details are set forth in the detailed description of the embodiments.

Figure 1 (prior art) shows a device for supplying a plurality of spray straight coolants.
Figure 2 is a schematic diagram illustrating an embodiment of an apparatus for cooling metal strips or other rolled stock according to the present invention.
3 is a schematic diagram showing a further embodiment according to the invention of an apparatus for cooling metal strips or other rolling stock.

For better clarity, reference is first made to the prior art disclosed in Fig. 1 shows a deep tank 4 used as a storage tank for a coolant. The coolant may be supplied to the distributor (6) through the lines (6) through the lines. From such a distributor 6, the coolant can be supplied to the plurality of spray bars 1. In this case, the spray bars (1) each comprise a plurality of outlets (7) for supplying coolant to the metal strips. Between the distributor 6 and each of the spray bars 1 a measuring sensor 15, a regulating valve 9 or a shutoff cock 8 (for example for coolant pressure or its volume flow rate) Can be disposed. Through these members, the coolant flow guided to each spray bar 1 is monitored and set.

2, a schematic diagram of an embodiment according to the present invention is shown. The coolant is supplied through the storage tank 4, similar to the prior art according to Fig. However, unlike the arrangement according to FIG. 1, the embodiment according to the invention of FIG. 2 preferably does not include the distributor 6. Rather, the coolant is separated from the storage tank 4 through the line 2 and supplied to the respective spray bars 1. The provided coolant flow can be increased through the pump 11, 11 'to the booster pump 11, 11'. In addition, the pump 11, 11 'may be bypassed, for example via bypass 3, to the coolant flow. The bypass 3 can be formed to be openable and closable so that the coolant flow is transferred through the pumps 11 and 11 'or bypasses the pumps 11 and 11' Static < / RTI > pressure). In addition, the volume flow rate can be monitored via the measuring sensor 15 and / or set via the regulating valve 9. However, precise control of the volumetric flow rate is not the essence of the present invention, and can be carried out, for example, through measures already known control technology aspects. Importantly, the device according to the invention comprises openable deflecting means 5, which can redirect the pre-accelerated coolant flow in a direction away from the spray bar 1. Thus, a flow or pre-accelerated volumetric flow rate can be introduced, for example, first into the discharge or overflow section 3. Such a coolant flow can be recovered, for example, subsequently to the storage tank 4. Additional treatment of the coolant is omitted because the coolant is not contaminated during the redirecting through the means (5). The deflecting means 5 may generally comprise two openable shut-off valves or shut-off cocks or shut-off flaps, whereby the volumetric flow rate is supplied to the spray bar 1 or to the recovery part 3. [ However, it is also possible to arrange only one openable flap. Through the described arrangement, the already accelerated coolant flow can be supplied and this coolant flow can be supplied to the spray bar 1 if necessary via the deflection means 5. The means 5 can be opened or closed by a sensor, for example, which records the presence or the inflow or outflow of the strip. In a manner that is replaced or added, the temperature of the strip can be monitored by a temperature sensor. Thus, depending on the temperature as a regulating variable, preferably the deflecting means 5 (actuating member) are arranged in such a way that the supply (actuation variable) of the coolant onto the strip through the spray bars 1 and the outlets 7 of these spray bars, And can be adjusted to open or close.

3, a schematic diagram of a cooling device according to a further embodiment of the present invention is shown. Unlike the apparatus shown in Fig. 1, a plurality of spray bars 1 are integrated into a first cooling group 10 and additional spray bars 1 'are integrated into a second cooling group 10'. One deflecting device 50 ', 50 is assigned (upstream) to each individual spray bar 1, 1' within each of the groups 10, 10 '. In other words, with each spray bar 1, 1 ', a pre-accelerated volumetric flow rate can be supplied via the assigned deflection means 50, 50'. Preferably, the deflecting means 50, 50 'are arranged such that, in order to keep the volume flow necessary for the interval between the position of the deflection through the means 5 and the spray bar, (1), so that the reaction rate of the system and its controllability are clearly improved.

The deflecting means 5, 50, 50 'can generally be opened or closed, for example, electrically, pneumatically, or hydraulically.

It should be understood that the above-described embodiments are only used for a better understanding of the present invention and are not to be construed as limiting. The scope of protection of the present patent application is set forth in the claims.

The features of the described embodiments may be combined or interchanged with one another.

Also, the features described may be modified in accordance with the terms of the present disclosure or existing requirements, via the ordinary artisan.

1 spray bar
1 'spray bar
2 line means
3 Bypassing means /
4 Source / Deep Tank
5 Opening type deflecting means / opening / closing valve
6-minute piping
7 Coolant outlets of spray bars
8 Block Cork
9 control valve
10 First Cooling Group
10 'Second Cooling Group
11 Pump / Booster Pump
11 'Second pump
13 Bypass
15 Measuring sensor
20 first line means
20 'Second line means
50 First openable type deflection means
50 'second openable type deflecting means

Claims (15)

A method for dynamically feeding a coolant to a cooling device (1, 1 '), in particular one or more spray bars (1, 1'), for cooling metal strips or other rolling stock,
a) directing the coolant flow bypassing the cooling device (1, 1 ') and guiding it into the collection part (3) while supplying a pre-accelerated coolant flow;
b) monitoring the presence and / or the temperature of the metal strip or other rolled stock to be cooled;
c) deflecting the already accelerated coolant flow to the cooling device (1, 1 ') in accordance with the presence of a metal strip or other rolled stock and / or its defined temperature, (1, 1 ') for cooling the metal strip or other rolling stock instead of being guided into the recovery section by bypassing the cooling device (1, 1' Coolant dynamic supply method. The method according to claim 1, characterized in that the pressure drop of the coolant flow when bypassing the cooling device (1, 1 ') and the pressure drop when supplying the coolant flow to the cooling device (1, 1' Wherein the pressure shock is prevented when deflecting the already accelerated refrigerant flow to the cooling device (1, 1 '). The cooling device according to claim 1 or 2, characterized in that the deflection of the coolant flow to minimize the position of the deflection of the coolant flow and the path between the outlets of the cooling device (1, 1 ' Is preferably performed at a location less than 5 m, preferably less than 3 m upstream of the outlets of the coolant supply system. The process according to any one of claims 1 to 3, characterized in that the volume flow rate of the coolant stream to be deflected is at least 150 m 3 / h, preferably at least 400 m 3 / h. An apparatus for cooling a metal strip, preferably for carrying out the method according to any one of claims 1 to 4,
A cooling device for cooling metal strips or other rolling stock comprising at least one spray bar (1, 1 ') with coolant outlets for discharging coolant onto the metal strip;
Line means (2, 20, 20 ') for guiding the coolant flow from the coolant supply source (4) to the spray bar (1, 1');
Bypass means for guiding the coolant flow into the recovery section (3) in the line means (2, 20, 20 ');
20 or 20 'to open or close the coolant flow to the spray bar 1 through the line means 2, 20 or 20' (5, 50, 50 ') formed to turn the flow. 6. A device according to claim 5, characterized in that the device (10) comprises at least one valve (9) for regulating the volumetric flow rate of the coolant flow flowing through the line means (2, 20, 20 ' (5, 50, 50 ') are located downstream of said regulating valve (9). 7. A device as claimed in claim 5 or 6, characterized in that the opening and closing direction switching means (5, 50, 50 ') comprise at least one openable flap for guiding the coolant flow towards the spray bars (1) , And / or said opening and closing direction switching means (5, 50, 50 ') perform a switching process of less than 5 s, preferably less than 1.5 s. 8. A device according to any one of claims 5 to 7, characterized in that the line means (2, 20, 20 ') further comprise pumps (11, 11') for increasing the volumetric flow rate of the coolant supplied from the source (4) Wherein the metal strip cooling device further comprises a metal strip cooling device. 9. A metal strip cooling apparatus according to claim 8, characterized in that the pump (11, 11 ') can be bypassed by a coolant flow to the bypass (13). 10. A method according to any one of claims 5 to 9, characterized in that a plurality of spray bars (1), preferably up to 10 spray bars (1), are incorporated into the first cooling group (10) The coolant may be supplied to the first line means 20 through the first line means 20 and for each of the at most three spray bars of the spray bars 1 of the first cooling group 10, (50) are provided for guiding the coolant flow into the recovery part (20) so that the coolant flow of the top three spray bars (1) of the first cooling group (10) And can be redirected into the detour means independently of the remaining spray bars of the first cooling group (10). 11. A method according to claim 10, characterized in that a further plurality of additional spray bars (1 '), preferably a maximum of 10 additional spray bars (1'), are incorporated into the second cooling group (10 ' 10 ') may be supplied with coolant through the second line means 20', and for each of the spray bars (1 ') of the second cooling group (10'), Opening and closing direction switching means 50 'for guiding the coolant flow into the recovery part in the line means 20' are provided so that the top three spray bars 1 'of the second cooling group 10' ) Of the second cooling group (10 ') can be redirected into the detour means independently of the remaining spray bars (1') of the second cooling group (10 '). 12. The metal strip cooling apparatus according to claim 11, wherein the first cooling group (10) and the second cooling group (10 ') are separated from each other and can receive coolant through the supply source (4) . 13. A metal strip cooling apparatus according to claim 11 or 12, characterized in that the volume flow towards each individual cooling group (10, 10 ') can be increased separately through the pump (11, 11' . 10. A device according to any one of claims 5 to 9, wherein the device comprises a plurality of spray bars (1)
Up to three spray bars 1 of the spray bars 1 are separated from the additional spray bars 1 and are assigned one opening and closing direction switching means 5 so that the maximum of three spray bars 1, A pre-accelerated coolant flow can be supplied through the line means 2 or the coolant flow can be supplied to the detour means via the direction switching means 5 assigned to the at most three spray bars 1 Or < / RTI > Or especially
Each of the spray bars 1 is separated from the additional spray bars 1 so as to be assigned one opening and closing direction switching means 5 so that a pre-accelerated coolant flow for each spray bar 1 Characterized in that the coolant flow can be supplied via the line means (2) or the coolant flow can be supplied to the detour means via the direction switching means (5) assigned to the spray bar (1) Device. 15. A device according to any one of the claims 5 to 14, characterized in that at least one spray bar of the sprayers (1) is supported via a support device, the openable direction switching means (5) being mounted on the support device , And / or the opening / closing type direction switching means (5) are located at a position less than 5 m upstream of the spray bar (1).

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