JPH0857524A - Method and device for augmenting contact between strip and liquid - Google Patents

Abstract

PURPOSE: To provide a method and a device for increasing contact between a strip and a fluid. CONSTITUTION: A fluid is always turned so that it becomes a flow 11 which is directed in parallel with a direction of motion of a strip as a massive flow 10 extending over a full width of a strip 1, and this flow 11 is guided along the strip and then guided out. A slit nozzle 24 is equipped with a comparatively narrow nozzle opening 25, a flow guide element 27 is provided to protrude from the nozzle opening, and a gradually curved flow guide surface 28 is formed. The flow guide surface is turned by substantially 90 deg. with respect to the strip, then forms a contact section 26 and finally opened into a fluid flowing-out pipe line 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to contact between a strip and a liquid, wherein the liquid flows under pressure from a storage container to an outflow mechanism and out of the outflow mechanism into the strip as an energy-rich stream. And a method and apparatus for enhancing the energy consumption.

[0002]

2. Description of the Prior Art In strip processing equipment for hot rolling and strip processing equipment for cold rolling, and for pickling treatment, in many cases, especially during strip cooling in hot rolling and strip cooling in cold rolling,
And for surface scaling during pickling, the strip must be flushed with liquid medium from one or both sides to make vigorous contact with the liquid medium.

Water, which is supplied under pressure, is used for strip cooling, and a suitable pickling solution is used for surface descaling. Traditionally, single nozzles or short slit nozzles have been used during cold rolling. Although conditioned by the design, the nozzle outlet must be protected so that it does not catch on the strip and form scratches on the strip.
Furthermore, it is necessary to adjust the nozzle according to the strip width. In hot rolling, so-called layered cooling sections, which consist of a large number of individual tubes with nozzles, are usually applied.

During the pickling process, the strip is passed through the pickling material in a dipping bath. At this time, replace the partially consumed pickling material with fresh pickling material as quickly as possible,
The pickling material must be fed across the width of the strip. This is because the pickling action and the permissible speed of the strip as it passes through the pickling bath depend on the condition of the pickling material. In other words, the residence time of the strip in the passage section is directly related to the fresh pickling material that is additionally fed and brought into contact with the strip.

[0005]

The problem underlying the present invention is to cool or pickle the hot strip so that a sufficiently large amount of cooling or pickling solution is vigorously contacted with the hot strip. It is possible to scratch the liquid with a given flow energy and with a uniform distribution over the width and the length of the surface to be wetted of the strip, and on the strip into which the outflow mechanism is introduced. It is an object to provide a method which makes it possible to supply without the risk of forming scratches, and a device with a particularly simple and robust construction for carrying out this method.

[0006]

The object is a method according to the preamble of claim 1 in which the liquid extends over and across the width of the strip. On the other hand, as a cohesive flow with a relatively narrow flow profile in the transverse direction, it is discharged at high speed vertically against the strip and then the flow is constantly oriented parallel to the strip movement direction. It is solved by diverting and directing this flow along the strip over a contact section of a given width and length and then out of the strip.

By virtue of the forced supply of liquid, a very specific amount of cooling or pickling liquid is supplied evenly over the width of the strip, with the flow cross section formed there. Under the equilibrium between the liquid quantities, the flow rate that induces the enhanced contact between the strip and the liquid is inevitably obtained over the entire contact zone.

In doing so, since the liquid is forced and violently flows into the strip at a relatively high relative velocity, when strip cooling is performed, there is a relatively high heat transfer between the flowing cooling liquid and the strip, and pickling. When carrying out, a vigorous exchange of the spent pickling solution with a new solution is achieved.

The outflow direction of the liquid under pressure is set to 9
A 0 ° turn makes it possible to form a flow profile over the entire width of the strip without the risk of scratching the strip by catching the outflow mechanism on the strip.

Furthermore, according to the invention, the liquid is transferred in an endless circulating flow from the storage container to the strip and from this strip back into the storage container, where the heat transferred from the strip is The liquid is sucked out from the liquid by the intercooling.

In an alternative configuration, the outflow of liquid from the outflow mechanism occurs below the stationary liquid bath level of liquid. The kinetic energy of the highly accelerated liquid flow is then propagated to the stationary liquid, so that a part of this stationary liquid is entrained and sent through the contact zone. In that case, the amount of liquid that is moving or is being moved is significantly enhanced, which in turn enhances the contact between the strip and the liquid.

A storage container for the liquid provided with a pressure pump, a pressure conduit and at least one outflow mechanism for the pressure chamber connected to said pressure conduit and in which the liquid is present. A feature of the apparatus for carrying out the above method is a slit nozzle extending across the width of the strip, the slit nozzle being relatively narrow transversely to the width of the strip. The nozzle port is vertically aligned in the direction of the strip with a space from the strip, and in this case, the flow guide member is connected to the slit nozzle on the downstream side and projects from the nozzle port. Forms a flow guide surface that is gradually curved toward the downstream direction.
After turning about 90 ° so that the flow guide surface is parallel to the strip, it extends from the strip at a predetermined distance below the formation of the contact section and opens into the liquid outflow line. Is.

By forming the flow guide, a defined flow path is formed along the contact section of a predetermined width and length, depending on whether it is provided below, above, or on both sides of the strip, It is then possible in the region of this contact area to vigorously wet and rinse the strip surface with a cooling or pickling solution.

A contact section is formed between the flow guide surface and the strip with a defined flow cross section, so that an adjustable flow velocity is forced in this section depending on the feed rate criterion.

According to another aspect of the present invention, a cooler is provided in the liquid outflow conduit. As a result, when the liquid is sent through the endless circulation system, the temperature of the liquid is maintained at a constant temperature level.

Other configurations are described in claims 5 to 8 of the claims. Hereinafter, the present invention will be described in detail with reference to the embodiments illustrated in the accompanying drawings.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT As shown in FIG.
Moves in the direction of arrow 2 over a device 40 for supplying liquid. In this case, such devices 40 can be provided below the strip 1, above the strip 1 and optionally in any number one behind the other.

This device 40 is provided with a pressure pump 21 and a pressure conduit 22 for a storage container 20 for liquids.
It has. A pressure chamber 23 having an outflow mechanism 24 is connected to the pressure conduit 22. This outflow mechanism 24 extends over the entire width of the strip 1 and is formed as a slit nozzle 24 with a relatively narrow nozzle opening 25. This slit nozzle 24 with a nozzle opening 25 is aligned vertically with respect to the strip 1 at a distance from the strip 1. As a result, under any circumstances, it is possible to prevent the newly running strip 1 from coming into contact with the slit nozzle 24 or getting caught in the slit nozzle 24. A flow guide body 27 is provided so as to be connected to the slit nozzle 24, that is, the nozzle opening 25 in the downstream direction, and project from the nozzle opening 25. The flow guide 27 comprises a flow guide surface 28 which is gradually curved in the downstream direction, which flow guide surface is parallel to the strip 1 after turning about 90 ° and at a predetermined distance from this strip. And extends while forming a contact section 26. This contact section 2
6 is open to the liquid outflow conduit 29. The contact section 26 is formed with a predetermined flow cross section between the flow guide surface 28 and the strip 1 and has a predetermined length.

As further seen in the drawing, a cooler 30 is provided in the liquid outflow line 29. In this cooler 30, the heat that is propagated from the strip 1 to the cooling liquid is derived from the liquid, which does not incur the disadvantage of heating the circulation system of the coolant.

FIG. 1 further shows that the apparatus 40 itself has a liquid bath level of 1.
It is shown to be configured to contain a stationary liquid 13 in the manner of a liquid bath with 2. In this case, the liquid flow 1 from the nozzle port 25 of the slit nozzle 24
An integral outflow of 0 takes place below the liquid bath level 12 of the stationary liquid 13. At that time, highly accelerated liquid flow 1
When the kinematic energy of 0 is propagated to the stationary liquid 13, a part of the stationary liquid 13 is carried and flows through the contact section 26 as a flow 11. In this case, a large amount of liquid is moved and sent through the contact section 26.

Further, FIG. 1 shows that the structure of the device 40 is extremely simple and robust. in this case,
With this mode of construction, the forced flow 11 in the contact zone 26 creates a large wetting zone with a constant relative velocity between the stream 11 and the strip 1.

Furthermore, it will be appreciated that it is possible to orient the flow direction of the contact section in the same direction as the running direction of the strip if the strip withdrawal speed is low. In this case, the device 40 for supplying the liquid is provided pivoted by 180 ° with respect to the drawing. Contact section 26
The method according to the invention and the device configured for carrying out the method, since no high specific pressure is formed in the interior as compared to the strip and because the pressure is evenly distributed over the cooling or pickling cross-section. Can also be used to cool thinly cast strips.

[0023]

In order to cool or pickle a hot strip by means of the method and device according to the invention, a sufficiently large amount of cooling or pickling liquid is brought into vigorous contact with this hot strip to bring the liquid to a predetermined extent. Fluid energy of
And with uniform distribution over the width and length of the surface to be wetted of the strip, without the risk of cooling or acidizing the strip without the risk of scratches on the strip being caught by the strip into which the outflow mechanism is introduced. Washing is even.

[Brief description of drawings]

1 shows an embodiment of a device for carrying out the method according to the invention.

[Explanation of symbols]

 1 strip 2 arrow 10 liquid flow 11 flow 12 liquid bath level 13 stationary liquid 20 storage container 21 pressurizing pump 22 pressure conduit 23 pressurizing chamber 24 slit nozzle 25 nozzle opening 26 contact section 27 flow guide 28 flow guide surface 29 liquid outflow line 30 cooler 40 device for supplying liquid

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C23G 3/02

Claims (8)

[Claims] 1. A strip (1), which is carried out by flowing liquid under pressure from a storage container (20) to an outflow mechanism (24) and out of this outflow mechanism into an strip (1) as an energy-rich stream. In a method for enhancing the contact between a liquid and a liquid, the liquid has a coherent flow (10) which extends over the entire width of the strip (1) and has a flow profile which is relatively narrow transversely to this strip. As a vertical discharge at high speed to the strip (1), then the stream (10) is constantly diverted into a stream (11) oriented parallel to the strip motion direction, and this stream ( A method characterized in that 11) is guided along the strip (1) over a contact section of a predetermined width and length and then out of the strip (1). 2. A liquid is recirculated from the storage container (20) to the strip (1) and then back again from the storage container (20) to the storage container (20) as a consistent circulating flow, whereupon it propagates from the strip (1). A method according to claim 1, characterized in that the heat is removed by intermediately cooling the liquid. 3. Outflow of liquid from the outflow mechanism (24),
Done below the liquid bath level (12) of the stationary liquid (13), where the kinetic energy of the highly accelerated liquid stream (10) propagates to the stationary liquid (13). Method according to claim 1 or 2, characterized in that a portion of this liquid is swirled by means of which it is fed through the contact zone (26). 4. A reservoir for liquids (20) provided with a pressure pump (21), a pressure conduit (22) and a pressure chamber connected to said pressure conduit and in which the liquid is present. (23) at least one outflow mechanism (2
4) in the device for enhancing the contact between the strip and the liquid, the outflow mechanism being a slit nozzle (24) extending over the entire width of the strip (1), The nozzle opening (25), which is relatively narrow laterally to the width, has the strip (1).
Is vertically aligned in the strip direction with a space from the bottom, and in this case is connected to the slit nozzle (24) on the downstream side and is provided with a flow guide body (27) projecting from the nozzle port (25). , The flow guiding body forms a gradually curved flow guiding surface (28) in the downstream direction, and the flow guiding surface is turned by approximately 90 ° so as to be parallel to the strip (1). A device, characterized in that it extends from this strip at a predetermined distance below the formation of a contact section (26) and opens into a liquid outflow line (29). 5. The contact section (26) has a flow guide surface (2).
5. Device according to claim 4, characterized in that it is formed with a defined flow cross section between the strip (8) and the strip (1) and has a defined length. 6. A cooler (3) in the liquid outflow conduit (29).
0) is provided.
An apparatus according to claim 1. 7. The device (40) is provided with a flow guide surface (28) oriented in the same direction as the strip movement direction (2) or in the opposite direction. The device according to any one of claims 4 to 6. 8. Device according to claim 4, characterized in that the device is provided below and / or above the strip (1) and optionally in a number of rows. The device according to.