WO2012101932A1 - 鋼板のスケール除去用ノズルおよび鋼板のスケール除去装置並びに鋼板のスケール除去方法 - Google Patents
鋼板のスケール除去用ノズルおよび鋼板のスケール除去装置並びに鋼板のスケール除去方法 Download PDFInfo
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- WO2012101932A1 WO2012101932A1 PCT/JP2011/079272 JP2011079272W WO2012101932A1 WO 2012101932 A1 WO2012101932 A1 WO 2012101932A1 JP 2011079272 W JP2011079272 W JP 2011079272W WO 2012101932 A1 WO2012101932 A1 WO 2012101932A1
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- nozzle
- scale
- water
- scale removal
- flow
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
- B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
- B05B1/042—Outlets having two planes of symmetry perpendicular to each other, one of them defining the plane of the jet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0408—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing two or more liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
- B05B1/3402—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to avoid or to reduce turbulencies, e.g. comprising fluid flow straightening means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/14—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts
- B05B15/18—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts for improving resistance to wear, e.g. inserts or coatings; for indicating wear; for handling or replacing worn parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/40—Filters located upstream of the spraying outlets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
- B08B2203/02—Details of machines or methods for cleaning by the force of jets or sprays
- B08B2203/0288—Ultra or megasonic jets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
Definitions
- a steel material rolling line steel material is charged into a heating furnace in an oxidizing atmosphere and heated in a temperature range of 1100 to 1300 ° C. for several hours, followed by hot rolling.
- a primary scale generated during heating and a secondary scale generated after extraction from the heating furnace are generated.
- the scale bites into the surface of the steel plate as a product, and remains as scale wrinkles. Scale wrinkles significantly deteriorate the surface properties of the steel sheet and have a significant effect on product quality because they become the starting point for cracks during bending.
- an antioxidant is applied to the surface of the steel material (see, for example, Patent Document 1), and (2) the heating temperature of the steel material is set below the melting point of firelight (about 1170 ° C.). (See, for example, Patent Document 2), (3) Rolling in a completely oxygen-free state (see, for example, Patent Document 3), (4) The temperature before rolling and the temperature during rolling are set to high temperatures (about 1000 ° C. or higher). (5) A proposal has been made to completely remove the generated scale (see, for example, Patent Document 4).
- the means (1) not only increases the complicated application work, but also increases the manufacturing cost due to the cost of the treatment agent.
- (2) since the steel material is heated at a low temperature, the burden on the rolling mill increases, and there is a standard that cannot be applied from the viewpoint of securing material properties depending on the steel type. Further, (3) is not realistic because the equipment cost becomes enormous. Moreover, since (4) is extracted from the heating furnace at a high temperature, the fuel unit price increases, and the scale loss increases.
- a scale removal nozzle used in a scale removal apparatus that performs descaling normally injects high-pressure water onto the surface of a steel sheet, and peels and removes the scale of the steel sheet by the impact force of the injected water.
- the technique described in Patent Document 4 is to review the internal structure of the nozzle for scale removal, and the orifice (discharge hole) at the tip of the nozzle and the taper angle 30 ⁇ from this orifice.
- a nozzle having a taper portion extending at 80 ° and a large diameter portion connected to the taper portion, wherein the ratio of the inner diameter D1 of the large diameter portion to the short diameter D2 of the orifice (D1 / D2) is 3 or more.
- the technique described in Patent Document 4 is a technique that optimizes the internal structure of a conventional scale removal nozzle, there is a limit in greatly improving the descaling capability.
- the present inventor has paid attention to such problems, and has repeatedly studied to provide a steel plate scale removal nozzle, a steel plate scale removal device, and a steel plate scale removal method that can remove scale more efficiently.
- the water jet discharged from the scaling nozzle became droplets, and attention was paid to cavitation generated on the steel plate scale surface (see FIG. 1).
- FIG. 2 the phenomenon that the pressure generated when the bubble generated by cavitation disappears becomes significantly larger than the impact force generated when the droplet collides depending on the conditions.
- the descaling ability could be improved if cavitation could be positively imparted to the water jet.
- the steel plate scale removal nozzle according to one aspect of the present invention sprays water onto the surface of the steel plate, and removes the scale of the steel plate by the impact of the sprayed water.
- the nozzle discharge portion has a main flow orifice and a branch flow orifice provided in communication with a large diameter portion forming a cylindrical flow path, and the branch flow orifice has the large diameter portion. A part of the internal water flow is discharged so as to generate cavitation at the boundary with the water flow discharged from the main flow orifice.
- Conventional scale removal nozzles form a droplet flow by discharging a water flow (main flow) jet from a single orifice as a continuous jet.
- the discharge portion at the tip of the nozzle is connected to the large-diameter portion forming the cylindrical flow path, and the main flow orifice and the branch flow orifice are provided.
- the branch flow orifice discharges a part of the water flow inside the large-diameter portion so as to generate cavitation at the boundary with the water flow discharged from the main flow orifice.
- the descaling capability can be greatly improved as compared with the conventional nozzle.
- the water flow (main flow) jet discharged from the main flow orifice of the nozzle is discharged from the branch flow orifice (discharged via the branch water channel). It is preferable that the flow surrounds the outer periphery. Thereby, cavitation can be suitably generated at the boundary between the water flow (main flow) jet discharged from the main flow orifice and the water flow. Therefore, the descaling capability can be further improved as compared with the conventional nozzle. Further, in the steel plate scale removal nozzle according to an aspect of the present invention, a ratio of a part of the water flow inside the large-diameter portion into the branch flow orifice is greater than 0% and 50% or less. It is preferable.
- a steel plate scale removing apparatus includes a plurality of scale removing nozzles arranged above and below a steel plate that is a rolled material in a rolling process, and each scale removing device.
- a scale removing device that removes scale on the surface of a rolled material by spraying high-pressure water onto the surface of the rolled material from a nozzle for use in a steel sheet, wherein the scale removing nozzle is used as the scale removing nozzle.
- the scale removal nozzle according to any one of the above is mounted.
- each scale removing nozzle is based on the scale removing nozzle according to any one of the scale removing nozzles for the steel sheet according to one aspect of the present invention. Since the effect is exhibited, the scale can be efficiently removed by the above-described action mechanism.
- the scale removal method of the steel plate which concerns on 1 aspect of this invention WHEREIN:
- the high-pressure water is supplied from the scale removal nozzle to the scale of the surface of the steel plate which is a rolling material in a rolling process.
- removing the scale by using the scale removal nozzle according to any one of the scale removal nozzles of the steel sheet according to one aspect of the present invention as the scale removal nozzle.
- a plurality of nozzles are arranged above and below the rolled material in the rolling step, and high-pressure water is sprayed from the scale removing nozzles onto the surface of the rolled material to remove the scale on the surface of the rolled material.
- the scale removal nozzle to be used is the scale removal nozzle according to any one of the scale removal nozzles for a steel sheet according to the aspect of the present invention.
- the scale can be efficiently removed by the above-described action mechanism.
- the scale on the surface of the rolled material can be efficiently removed.
- FIG. 1 is a schematic diagram showing an image of a state in which cavitation occurs when a water jet discharged from a descaling nozzle becomes droplets and collides with a steel plate scale surface.
- FIG. 2 is a diagram showing an image of a state in which pressure is generated when bubbles generated by cavitation shown in FIG. 1 disappear, and a relationship between the bubble radius at the time of disappearance / the radius at the time of occurrence and the pressure generated in the vicinity of the bubble. .
- FIG. 3 is a schematic configuration diagram showing an example of a rolling line equipped with a steel sheet scale removing device according to the present invention.
- FIG. 4 is a schematic perspective view showing an example of the scale removing nozzle of the present invention.
- FIG. 5 is a schematic cross-sectional view taken along the axial direction on the plane of the YY line in FIG. 4.
- FIG. 6 is a schematic front view of the nozzle discharge section of FIG.
- FIG. 7 is a diagram showing a discharge portion of a conventional scale removal nozzle used in the comparative example.
- FIG. 8 is an explanatory view showing a collision model of water droplets on a steel plate in scale removal by spray water.
- FIG. 9 is a diagram for explaining the state of a water flow (mainstream) jet.
- FIG. 9A is an example of the scale removal nozzle of the present invention
- FIG. 9B is an example of a conventional scale removal nozzle. It is.
- the rolling process of the steel plate includes a heating furnace 50 for heating the material to be rolled (steel plate) K and a heating furnace 50 for removing scale from the material to be rolled K taken out from the heating furnace 50.
- a heating furnace outlet-side deskeler 60 installed on the side (HSB), followed by a rough rolling mill 70 for performing rough rolling, and a finish rolling mill 80 for subsequent finish rolling.
- the scale removing device of the present invention is arranged in each rolling process. That is, the heating furnace outlet-side descaler 60 has the heating furnace outlet-side scale removal nozzle mounting adapters 61 arranged above and below the material K to be rolled. Similarly, a scale removal nozzle mounting adapter 62 is provided on the rough rolling entry side (RSB) of the rough rolling mill 70, and a scale removal nozzle attachment adapter 63 is provided on the finishing rolling entry side (FSB) of the finish rolling mill 80. Are arranged above and below the material to be rolled K, respectively. Each of the scale removal nozzle mounting adapters 61, 62, 63 is equipped with a scale removal nozzle 1 (hereinafter also simply referred to as “nozzle”).
- nozzle scale removal nozzle 1
- the scale removal nozzle 1 attached to the adapter 61, 62, 63 for attaching the scale removal nozzle is connected to the pump 30 and the accumulator 40 through piping, and sprays high-pressure water onto the surface of the material K to be rolled. Can do. In this facility, the pressure and the discharge amount of the high-pressure water to be injected can be always stably secured by the plurality of pumps 30 and the accumulator 40.
- FIG. 4 is a schematic perspective view of the nozzle 1
- FIG. 5 is a schematic cross-sectional view cut along the axial direction on the plane of the YY line in FIG. 4
- FIG. 6 is a schematic of the discharge portion at the nozzle tip in FIG. It is a front view.
- the nozzle 1 mainly includes a casing 2, a nozzle case 11, and a nozzle tip 12.
- a flow path (or nozzle hole) is formed in the axial direction of the nozzle 1 by these members.
- the casing 2 has a substantially cylindrical shape and is provided with a flow path (or nozzle hole) therein so that water can flow into the flow path from one end on the upstream side of the nozzle 1.
- the nozzle case 11 is attached to the other end of the casing 2.
- the nozzle case 11 has a substantially cylindrical shape, and a nozzle tip 12 is mounted on the tip end side of the nozzle 1.
- the nozzle tip 12 is made of cemented carbide, and ejects a discharge flow therefrom.
- the casing 2 includes a first casing 2a that can be fixed to the nozzle case 11 with screws, and a second casing 2b that can be fixed to the first casing 2a with screws.
- a plurality of slits (or inlets) 3 extending in the axial direction are formed at predetermined intervals in the circumferential direction on the circumferential surface and the end surface (flat surface) at the upstream end of the second casing 2b.
- the plurality of slits 3 serve as filters for allowing water to flow in while restricting the inflow of impurities.
- a rectifying unit (or rectifier or stabilizer) 4 is disposed in the flow path in the second casing 2b.
- the rectifying unit 4 is for guiding the water flowing in from the slit 3 to the nozzle hole, and includes a plurality of rectifying plates (rectifying blades) 5 extending in the radial direction from the core, and upstream and downstream of the core. It is provided with acute cone portions (conical portions tapered on the upstream side or the downstream side) 6a and 6b that are formed coaxially and are respectively formed with their tip portions directed in the upstream and downstream directions.
- the casing 2 that constitutes such a filter and includes the rectifying unit can also be referred to as a filter unit or a rectifying casing.
- the rectifying plate 5 of the rectifying unit 4 is in contact with the inner wall of the second casing 2b, and the rectifying unit 4 is restricted from moving downstream by fixing means (for example, locking, welding, fixing, etc.). ing.
- the flow path of the casing 2 extends from the upstream end (inlet) of the second casing 2b to the downstream end of the rectifying unit 4, and has substantially the same inner diameter (that is, the inner diameter of the upstream end of the casing 2b).
- a cylindrical flow path P1 having the same inner diameter, and an inclined flow path (annular inclination) that reaches a middle portion of the first casing 2a from the downstream end of the rectifying unit 4 toward the downstream direction and narrows in a tapered shape with a gentle inclination.
- the inclined wall (tapered portion) forming the inclined channel (annular inclined channel) P2 has a taper angle of about 5 to 10 °, for example.
- a cemented carbide nozzle tip 12 and a flow path having substantially the same inner diameter as the downstream end of the first casing 2a are formed from the tip of the nozzle 1 toward the upstream direction.
- Bushings (or annular side walls) 17 are sequentially attached.
- the nozzle tip 12 is regulated by the latching step portion 13 in the direction toward the tip.
- the nozzle 1 includes a nozzle tip 12 serving as a discharge portion at the tip thereof, a large-diameter portion 18 that forms a cylindrical flow path, a tapered portion 16 that is provided continuously to the large-diameter portion 18, and an output from the tapered portion 16.
- An elliptical discharge hole 15 provided continuously on the side is formed.
- the tip surface of the nozzle tip 12 is formed with a U-shaped curved groove 14 in the radial direction, and an elliptical discharge hole 15 is formed on the curved concave surface of the curved groove 14 as shown in FIG. Are provided continuously.
- the bottom surface of the curved groove 14 may be a curved bottom surface with both end portions raised as it extends in the extending direction (or radial direction) with the discharge hole 15 as the lowermost portion.
- the nozzle 1 has two branch holes (branch flow orifices) 19 provided between the nozzle tip 12 and the nozzle case 11 so as to communicate with the large diameter portion 18 forming the cylindrical flow path.
- Each branch hole 19 has an arc shape along the circumferential direction of the nozzle tip 12 (in this example, the center of the arc coincides with the axis), and a part of the water flow inside the nozzle is used as a discharge hole of the nozzle tip 12.
- 15 is formed so as to discharge the water flow so as to generate cavitation C at the boundary with the water flow discharged from 15 (see FIG. 9A).
- each branch hole 19 is formed in an arc shape along the circumferential direction of the nozzle chip 12, so that the water flow to be discharged is a flow surrounding the outer periphery of the water flow discharged from the discharge hole 15.
- the flow path (nozzle hole) of the nozzle extending in the axial direction of the nozzle 1 is a taper portion extending linearly from the discharge hole 15 opened in an elliptical shape in the curved groove 14 toward the upstream direction of the axial line.
- (Or conical inclined wall) 16 is formed by a conical flow path P5 formed by 16; a branch flow path P6 composed of a branch hole 19 formed between the nozzle tip 12 and the nozzle case 11; And a cylindrical flow path P4 extending in the upstream direction along the axial direction from the upstream end of the tapered portion 16 and a large cylindrical flow extending from the upstream end of the cylindrical flow path P4 with substantially the same inner diameter.
- Path flow path from the upstream end of the cylindrical flow path P4 to the upstream end of the rectifying unit 4) P3 to P1.
- the flow path in this example, the cylindrical flow paths P3 and P4 from the upstream end of the taper part 16 to the downstream end of the gently inclined flow path P2 extends from the upstream end of the taper part 16 with substantially the same inner diameter.
- the large diameter portion 18 can be obtained.
- each of the elliptical discharge holes 15 has a major axis D3 / minor axis D2 ratio of about 1.5 to 1.8. Further, regarding the relationship between the discharge hole 15 and the large diameter portion 18, in order to reduce the size of the nozzle, the large diameter portion 18 (the cylindrical flow paths P3 and P4 or the rectifying unit downstream from the short diameter D2 of the discharge hole 15).
- the ratio (D1 / D2) of the inner diameter D1 (downstream end of the inclined flow path P2) extends to about 4.5 to 6.9.
- the angle (taper angle) ⁇ of the tapered portion 16 is set to about 45 to 55 ° in order to increase the impact force even at a low pressure and / or a low flow rate.
- a flange for attaching the nozzle 1 to a conduit (not shown) using an adapter (not shown) at an appropriate place (in this example, the nozzle case 2) of the nozzle case 11 and the casing 2 ) 24 and the like can be formed.
- the nozzle case 11 may be provided with a positioning convex portion 25 for the conduit in order to increase the positioning accuracy and inject the discharge flow in a flat or strip shape in a predetermined direction.
- the nozzle 1 is attached to the adapters 61, 62, and 64 for attaching the scale removing nozzle of the scale removing device.
- the nozzle 1 has the discharge portion at the tip of the nozzle continuously provided on the tapered portion 16 continuously provided on the large diameter portion 18 forming the cylindrical flow path and on the outlet side of the tapered portion 16.
- the branch hole 19 discharges a part of the water flow inside the nozzle so as to generate cavitation at the boundary with the water flow discharged from the discharge hole 15 of the nozzle tip 12. Thereby, cavitation can be generated at the boundary between the water flow (main flow) jet discharged from the nozzle orifice and the water flow.
- the descaling capability is greatly improved as compared with the conventional nozzle. Therefore, according to the scale removing device, the scale removing nozzle 1 attached thereto, and the steel plate scale removing method using the nozzle 1, both the descaling performance and efficiency can be greatly improved.
- the standard plate width is 1.2 m
- the standard plate thickness is 220 mm for the outlet side 220 mm of the heating furnace 50
- the rough rolling inlet side (RSB) 62 is 220 to 70 mm
- the finishing rolling inlet side (FSB) 63 is 60 to 40 mm was used.
- the results of comparison experiments with the conventional type are shown in Table 1 below.
- the ratio of the total amount of water that introduces a part of the water flow inside the nozzle into the branch hole according to the injection pressure P0 [Pa], the descaling flow rate [l / min], and the spray distance H [m]. Is adjusted in the range of more than 0% and 50% or less.
- FIG. 8 is a diagram illustrating a collision model of water droplets on a steel plate in scale removal by jet water.
- the total impact force (F) and the unit impact force (S) can be expressed by the following equations.
- F total impact force of water sprayed on the steel sheet surface [N]
- S unit impact force of water sprayed on the steel sheet surface [Pa]
- P0 spray pressure [Pa]
- a orifice area [M 2 ]
- C sound velocity [m / s]
- d particle size [m] of water droplet
- ⁇ coefficient
- t time [s] for the shock wave to travel through the droplet.
- the descaling capability is 1.3 to 1.5 times the improvement of the descaling capability in any process compared to the conventional one, the power consumption at the pump 30 is 70%, and The possibility of reducing the flow rate by improving the descaling capability is reduced by 30%, and the occurrence rate of quality defects due to the descaling capability is less than 50% compared to the conventional one. Therefore, according to the scale removal nozzle 1, it can be seen that both the descaling performance and efficiency are greatly improved.
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Abstract
Description
しかしながら、特許文献4に記載の技術は、従来のスケール除去用ノズルの内部構造を最適化した技術なので、デスケーリング能力を大幅に向上させる上では限界があった。
また、本発明の一態様に係る鋼板のスケール除去用ノズルにおいて、前記径大部内部の水流の一部を前記分岐流オリフィスに導入する全体水量に対する割合を、0%を超え50%以下とすることは好ましい。
本発明の一態様に係る鋼板のスケール除去装置によれば、各スケール除去用ノズルが、上記本発明の一態様に係る鋼板のスケール除去用ノズルのうちいずれか一の態様のスケール除去用ノズルによる作用効果を奏するので、上述の作用機序により、スケールを効率よく除去することができる。
本発明の一態様に係る鋼板のスケール除去方法によれば、使用するスケール除去用ノズルが、上記本発明の一態様に係る鋼板のスケール除去用ノズルのうちいずれか一の態様のスケール除去用ノズルによる作用効果を奏するので、上述の作用機序により、スケールを効率よく除去することができる。
図3に示すように、鋼板の圧延工程は、被圧延材(鋼板)Kを加熱する加熱炉50と、加熱炉50から取り出された被圧延材Kからスケールを除去するために加熱炉50出側(HSB)に設置された加熱炉出側デスケラ60と、それに続いて粗圧延を行なう粗圧延機70と、それに続いて仕上げ圧延を行なう仕上げ圧延機80とから構成されている。
図4~図6に示すように、ノズル1は、ケーシング2と、ノズルケース11と、ノズルチップ12とから主に構成されている。そして、これらの部材によってノズル1の軸線方向に流路(又はノズル孔)が形成されている。
第2のケーシング2bの上流側端部での周面及び端面(平坦面)には、軸方向に延びる複数のスリット(又は流入口)3が周方向に所定の間隔ごとに形成されている。複数のスリット3は、不純物の流入を規制しつつ水を流入させるためのフィルタとしてはたらくものである。また、第2のケーシング2b内の流路には、整流ユニット(又は整流器若しくはスタビライザ)4が配設されている。
スケール除去装置の、スケール除去用ノズルの装着用アダプター61、62、64には、ノズル1が装着されている。ノズル1は、上述のように、ノズル先端の吐出部が、円筒状流路を形成する径大部18に連続して設けられたテーパ部16と、テーパ部16出側に連続して設けられた吐出孔15とが形成され、さらに、ノズルチップ12とノズルケース11との間には、円筒状流路を形成する径大部18に連通して設けられた分岐孔19を有する。分岐孔19は、ノズル内部の水流の一部を、ノズルチップ12の吐出孔15から吐出した水流との境界部にキャビテーションを発生させるように吐出する。これにより、ノズルのオリフィスから吐出した水流(主流)ジェットの水流との境界部にキャビテーションを発生させることができる。この結果、従来ノズルに比べてデスケーリング能力が大幅に向上する。よって、このスケール除去装置およびこれに装着されたスケール除去用ノズル1、並びにノズル1を用いた鋼板のスケール除去方法によれば、デスケーリングの性能、効率ともに大幅に改善することができる。
つまり、デスケーリング能力は噴射水が鋼材表面に衝突する際に発生する総衝撃力(F)および単位衝撃力(S)で評価することができる。図8は、噴射水によるスケール除去における水滴の鋼板への衝突モデルを示す図である。同図において、総衝撃力(F)および単位衝撃力(S)は、以下の式で示すことができる。
F=P0×a×C×(3/d)×α×t
S=F/A
但し、F:鋼板表面での噴射された水の総衝撃力[N],S:鋼板表面での噴射された水の単位衝撃力[Pa],P0:噴射圧力[Pa],a:オリフィス面積[m2],C:音速[m/s],d:水滴の粒子径[m],α:係数,t:衝撃波が液滴中を伝わる時間[s]である。
なお、本発明に係る鋼板のスケール除去用ノズルおよび鋼板のスケール除去装置並びに鋼板のスケール除去方法は、上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しなければ種々の変形が可能であることは勿論である。
2 ケーシング
4 整流ユニット
11 ノズルケース
12 ノズルチップ
14 湾曲溝
15 吐出孔(主流オリフィス)
16 テーパ部(又は円錐状傾斜壁)
17 ブシュ(又は環状側壁)
18 径大部
19 分岐孔(分岐流オリフィス)
20 吐出部
30 ポンプ
40 アキュムレータ
50 加熱炉
60 加熱路出側デスケラ
61、62、63 スケール除去用ノズルの装着用アダプター
70 粗圧延機
80 仕上げ圧延機
K 被圧延材(鋼板)
P1 円筒状流路
P2 傾斜流路
P3 円筒状流路
P4 円筒状流路
P5 円錐状流路
P6 分岐流路
Claims (5)
- 鋼板の表面に水を噴射し、その噴射された水の衝撃によって鋼板のスケールを除去するスケール除去用ノズルであって、
ノズル先端の吐出部は、円筒状流路を形成する径大部に連通して設けられた主流オリフィスおよび分岐流オリフィスを有し、前記分岐流オリフィスは、前記径大部内部の水流の一部を、前記主流オリフィスから吐出した水流との境界部にキャビテーションを発生させるように吐出することを特徴とする鋼板のスケール除去用ノズル。 - 前記分岐流オリフィスから吐出する水流を、前記主流オリフィスから吐出した水流の外周を囲む流れとすることを特徴とする請求項1に記載の鋼板のスケール除去用ノズル。
- 前記径大部内部の水流の一部を前記分岐流オリフィスに導入する全体水量に対する割合を、0%を超え50%以下とすることを特徴とする請求項1または2に記載の鋼板のスケール除去用ノズル。
- 圧延工程における圧延材である鋼板の上下に配置される複数のスケール除去用ノズルを備え、各スケール除去用ノズルから高圧の水を圧延材表面に噴射して圧延材表面のスケールを除去するスケール除去装置であって、
前記スケール除去用ノズルとして、請求項1~3のいずれか一項に記載のスケール除去用ノズルが装着されていることを特徴とする鋼板のスケール除去装置。 - 圧延工程における圧延材である鋼板の表面のスケールを、スケール除去用ノズルから高圧の水を圧延材表面に噴射して除去する方法であって、
前記スケール除去用ノズルとして、請求項1~3のいずれか一項に記載のスケール除去用ノズルを用い、当該スケール除去用ノズルを圧延工程での圧延材の上下に複数配置し、各スケール除去用ノズルから高圧の水を圧延材表面に噴射して圧延材表面のスケールを除去することを特徴とする鋼板のスケール除去方法。
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