CA1165971A - Device for spraying cooling agent on steel blooms - Google Patents
Device for spraying cooling agent on steel bloomsInfo
- Publication number
- CA1165971A CA1165971A CA000370177A CA370177A CA1165971A CA 1165971 A CA1165971 A CA 1165971A CA 000370177 A CA000370177 A CA 000370177A CA 370177 A CA370177 A CA 370177A CA 1165971 A CA1165971 A CA 1165971A
- Authority
- CA
- Canada
- Prior art keywords
- mixing chamber
- nozzle
- bloom
- nozzle housing
- cast ribbon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000002826 coolant Substances 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 8
- 239000010959 steel Substances 0.000 title claims abstract description 8
- 238000005507 spraying Methods 0.000 title claims description 5
- 239000007921 spray Substances 0.000 claims abstract description 18
- 238000009749 continuous casting Methods 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims abstract description 5
- 238000003780 insertion Methods 0.000 claims abstract description 4
- 230000037431 insertion Effects 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 7
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 244000007853 Sarothamnus scoparius Species 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000010276 construction Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- 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
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
- B05B7/0483—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with gas and liquid jets intersecting in the mixing chamber
-
- 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
- B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
-
- 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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
- Nozzles (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
A cooling spray for steel blooms, more particularly continuous cast ribbons, comprises a mixing chamber having separate inlets for impellant and cooling agent, with nozzle outlets formed by diametrically opposed prismatic apertures milled in a cylindrical nozzle housing and opening into a cylindrical entry bore into which the mixing chamber opens, and the coolant entry into the mixing chamber is through a replaceable insertion pipe projecting into the mixing chamber A continuous casting installation has one such spray device between each adjacent pair of guide rolls on the upper face of the cast ribbon and successive spray devices are alternately displaced through a certain distance on either side of the central axis of the cast ribbon, with the distance about half the breadth of the unwetted bloom surface.
A cooling spray for steel blooms, more particularly continuous cast ribbons, comprises a mixing chamber having separate inlets for impellant and cooling agent, with nozzle outlets formed by diametrically opposed prismatic apertures milled in a cylindrical nozzle housing and opening into a cylindrical entry bore into which the mixing chamber opens, and the coolant entry into the mixing chamber is through a replaceable insertion pipe projecting into the mixing chamber A continuous casting installation has one such spray device between each adjacent pair of guide rolls on the upper face of the cast ribbon and successive spray devices are alternately displaced through a certain distance on either side of the central axis of the cast ribbon, with the distance about half the breadth of the unwetted bloom surface.
Description
'7~
This invention relates to a device for spraying a cooling agent on steel blooms, comprising spray nozzles connected to a mixing chamber having separate inlets for the impellant and the cooling agent, the nozzle outlets being so adapted that the impel-lant-coolant mlxture implnges on thc bloom surface ln a broad fan and at an acute angle .in mutually opposed di.rections, the nozzle ou-tlets projecting from a com~on nozzle housing into which the mixing chamber opens, while the coolant union on the mixing chamber is formed by a replaceable insertion pipe projecting into the mixing chamber. The invention is particularly applicable to a continuous casting installation from which blooms emerge in the form of cast ribbons, the nozzles being directed into each gap between successive pairs of guide.rolls for the cast ribbon and being directed parallel to the guide roll axes, and the noz~le housing being disposed between the mid-plane of the guide roll axes and the bloom surface.
A device having the significant features specified above forms the subject of prior German Patent Application P 28 16 441.2-2~.
~ The cited prior Application is concerned substantially with the 20 following problems:-1. The mixture of water, air, steam or gas should be uniformlydistributed over the bloom and uniformly accelerated as it is sprayed over the width of the`bloom.
This invention relates to a device for spraying a cooling agent on steel blooms, comprising spray nozzles connected to a mixing chamber having separate inlets for the impellant and the cooling agent, the nozzle outlets being so adapted that the impel-lant-coolant mlxture implnges on thc bloom surface ln a broad fan and at an acute angle .in mutually opposed di.rections, the nozzle ou-tlets projecting from a com~on nozzle housing into which the mixing chamber opens, while the coolant union on the mixing chamber is formed by a replaceable insertion pipe projecting into the mixing chamber. The invention is particularly applicable to a continuous casting installation from which blooms emerge in the form of cast ribbons, the nozzles being directed into each gap between successive pairs of guide.rolls for the cast ribbon and being directed parallel to the guide roll axes, and the noz~le housing being disposed between the mid-plane of the guide roll axes and the bloom surface.
A device having the significant features specified above forms the subject of prior German Patent Application P 28 16 441.2-2~.
~ The cited prior Application is concerned substantially with the 20 following problems:-1. The mixture of water, air, steam or gas should be uniformlydistributed over the bloom and uniformly accelerated as it is sprayed over the width of the`bloom.
2. It should be possible to spray into the roll shadows (i.e., the generally triangular gaps between the bloom surface and the xolls), and simultaneously the clearing aCtiQn of the mixture stream should remove stagnant water and scale part1cles from the gaps between the rolls.
3. The water throughput should be adjustable, without of course impairing the spray pattern and without replacing a given npzzle.
The object of the present invention is to provide such a * published October 18th 1979 ~S~'7~l device with an improved performance so tha-t:
a) a more extensive heat exchange surface is attained by a broader fan-shaped jet, b) a more intensive cooling action is brought about by smaller droplets and the individual droplets can evaporate more rapidly, while c) droplets which do not evaporàte are cleared laterally across the bloom. In addition, it is intended to simplify the nozzle design.
Accordingly, the invention as herein broadly claimed, lies in the provision of a device for spraying a cooling agent on a steel bloom having a bloom surface, comprising: spray nozzles connected to a mixing chamber having separa-te inlets for an impellant and a cooling agent to be mixed in said chamber; nozzle outlets adapted so that the impellant-coolant mixture impinges on the bloom surface in a broad fan and at an acute angle in mutually opposed directions, the nozzle outlets projecting Erom a common nozzle housing into which the mixing chamber opens, said coolant inlet includiny a coolant union on the mixing chamber formed by a replaceable insertion pipe pro-jecting into the mixing chamber, the nozzle housing being essentially cylindrical and having a cylindrical entry bore, while the nozzle outlets are formed by two prismatic milled apertures in the nozzle housing, diametrically opposite each other and each opening radially into the entry bore.
The invention avoids the concept embodied in the device of the prior patent application P 28 16 441.2-24 of providing opposed nozzle outlet openings, i.e. openings directed towards each other. This provides the advantageous possibility of broadening the jet to the required extent without mutual interference between the jets (which would ensue with the device of the above prior patent application).
5~'7~
The concept of the invention, whereby -the nozzle construction is so modified that the jets are no longér directed in opposition to each other, simultaneously leads to a simpler nozzle construction.
Preferably, the cylindrical entry bore of the nozzle housing is formed as a blind hole haviny a hemi-spherically shaped inner end, while the milled lateral apertures forming the nozzle outlets open into the hemi-spherical end-zone of the entry bore in the nozzle housing.
A ~urther preferred feature of the invention consists in that a disc-shaped spinner is provided inside the entry bore in the nozzle housing, in advance of the nozzle outle-ts. The spinner is .
~ - 2a -'7:~.
preferably adapted so that the previously formed mix-ture of water and air, which contains a higher proportion of water in the centre of the mixing chamber (considered radially) than in the peripheral zones, is mixed still more intensively. In this way the average drolet diameter can be advantageously reduced.
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:-Figure 1 is a plan view (taken from the line I-I in Figure 2) of part of a cast ribbon passing between guide rolls;
Figure 2 is a part sectional view taken from the line II-I~
in Figure l;
Figure 3, on a larger scale than that of Figures 1 and 2 is an exploded view of a cooling device (with some parts partly sectioned) in accordance with the invention and for use as indicated in Figures 1 and 2;
Figure 4 is a view of the nozzle housing seen at the bottom oE Figure 3, looking in the direc-tion oE -the arrow A;
Figure 5 is a section taken on the line V-V in Figure 3; and Figure 6 is a plan view of -the spinner half of which can be : seen in the sectioned half of the nozzle housing in Figure 3.
Figures 1 and 2 show pairs of opposed parallel guide rolls 10 ` and 11 in a continuous casting machine for steel blooms. Each steel bloom 12 passes between the guide rolls 10 and 11 of each pair, and successive pairs of guide rolls are disposed with relatively small intermediate spacings a. A cooling device 14 is directed towards the upper face of the steel bloom 12 between each adjacent pair of guide rolls 10.
As shown in more detail in Figure 3, the cooling device 14 comprises a nozzle housing 15 and a mixing chamber 16 having a lateral union 17 to admit an impellant, for example ai.r, and a coaxial union 13 for coolant, for example water.
7~
As Figure 3 further shows, the coolant union 18 is substan-tially adapted as a tubular insert 19 projecting into -the tubular mixing chamber 16. A fixing nut 20 having an internal thread 21 is welded to the upper end of the tubular insert 19. The nut 20 and the thread 21 are used to fix the tubular insert 19 on a corresponding thread 22 on the mixing chamber 16. An external thread 23 is provided on the upper end of the nut 20, for connection to a coolant supply line, normaly for example with the aid of a cap nut. The coolant, water, is admitted into the -tubular insert 10 19 at 23 and passes thence into the mixing chamber 16 at a flow rate which is precisely determined by the internal diameter of the tubular insert 19. Thus, by replacing a given tubular insert 19 by one of larger or smaller diameter, it is a simple matter to adjust the flow rate of cooling water independen-tly of the flow rate of air entering the mixing chamber 16 at 17 and independently of the geometry of the nozzle housing 15. Since the tubular insert 19 can be replaced with ease, various flow rate .ratios of coolant to impellant can be selected wi-th corresponding ease withou-t inter-fering in any way with the nozzle housing 15 itself. Moreover, no ad~ustments need be made for this purpose in the pressure settings of the coolant supply line on the one hand or the impellant supply line on the other.
By reason of the rela-tively large cross-section of the mixing chamber 16 r friction losses in the mixture advancing tc the nozzle are kept low, with the advantageous e.ffect of raising the exit velocity.
~ further advantage in the same sense accrues from the fact that the stream of mixed coolant and impellant in the nozzle housing 15 is divided into two separate streams. As Figure 3 fur-ther shows, the nozzle housing 15 has a cylindrical en-try bore 24, in the form of a blind hole. The entry bore 24 has two shoulders, and an internal thread 25 at its upper end meshes with a correspon-~s~
ding e~ternal thread 26 o~ the mixing chamber 16. The blind hole24 contains a disc-shaped spinnex 27, which is supported axially on a shoulder ~8 in the blind hole 24 of the nozzle housing 15.
Figure 6 shows the spinner 27 in plan view. Its circular periphèry has four milled radial notches 29 spaced at angles of 90 to each other. The spinner 27, in conjunction with the arrangement and construction already described, brings about still more intensive mixing in the mixture of water and air already present in the mixing chamber 16, whereby the average droplet diameter in the je-ts emerging from the nozzle housing 15 can be advantageously reduced still further. It will be seen by reference also to Figures 4 and 5, that the nozzle has two outlets formed by two diametrically opposed prismatic milled apertures 30 and 31 in the nozzle housing 15. The apertures 30 and 31 are milled so that they penetra-te into the blind-hole entry bore 24 in the nozzle housing 15, in a hemi-spherical end-zone 32 o -the entry bore 24 to form two nozzle outlets 33, the shape of each of which is shown particularly clear-ly in Figure 4. The prismatic milled apertures 30 and 31 are inclined at an angle (Figure 3) of 5 relative to their respective planes of symmetry about the horizontal plane of the bloom surface. The nozzle outlets 33 produce two broad fan jets directed in opposite directions (see Figures l and 2). The two fan jets extend in plan view (Figure 1) over a larger angle ~ and at right angles thereto tFigure 2) over a smaller angle ~. The advantage of extending the jet over a wide angle~ is to be seen in that within a short distance from the nozzle outlet the entire breadth of the free bloom surface - seen in the casting direction 13 - is covered with spray. The advantage of extending the je-t over the angle ~
consists in that the incidence zone of the spray jet on the bloom surface - seen in the jet direction 34 - is increased. The planes of the fan jets extending over the angle~lie parallel to the bloom surface. In other words, a larger proportion of he exposed bloom S~7~
surface between guide rolls 10 - denoted by the dimension c in Figure 1 - is covered within a shorter distance from the nozzle housing 15 than can be achieved with the device of the prior Application P 28 16 441.2-24. These advantages, based on the angles c-,~ and~ , significantly improve the uniformity of bloom cooling.
The above advantages appertain to each fan jet individually. The distinction between the fan jets produced by a device in accordance with the invention and by the prior device of P 28 16 441.2-24 is substantially charac-terised in that individual fan jets are produced, having a broad extent (angle ~) and little widening at right angles thereto (an~le ~), whereas the device of the prior Application P.28 16 441.2-~4 produces somewhat flattened oval jets from approximately circular initial jets.
Another significant distinction from the prior device of P
28 16 441.2-24 consists in that the nozzle housing 15 is located no further than 150 mm from the nozzle-facing end of the tubular insert 19 in the mixing chamber 16. This dimension b is shown in Figure 3. It relates o course ot the assembled state of the individual components and not as shown exploded in Figure 3.
Figures 1 and 2 also disclose a further significant feature of the invention~ This consists in that the successive spray a rra~ ~c~
devices 14 ~}}i~Y~ in the casting direction 13 are alternately dis-placed through a distance d from the cen-tral axis 35 of the cast ribbon, first to the left and then to the right. The lateral displa-cement d of each spray device 14 is adjusted according to the width e of the sprayin~ gap. In fact, as Figure 2 shows, it amounts to about half the breadth f of the unsprayed bloom surface. Since the spray device in the next guide-roll gap is displaced over the same distance d on the other side of the central axis 35, the entire breadth of the bloom 12 is covered with liquid by a pair of cooling devices 14.
To summarise, the following significant advantages accrue from the device of the invention:
The prismatic apertùres 30,3,l ~orming the nozz~e outlets 33, each spraying outwards from the central axis of the mixing chamber 16, produce fan jets the angular dimensions (~ and ~ ) of which can be adjusted by varying the geometry of the entry bore 24 and of the apertures 30,31. This facilitates a more uniform coverage of the bloom surface re~uiring cooling. The mixing chamber 16 in conjunction with the spinner 27 in the nozzle housing 15 produces more effective mixing between the water and air, thereby reducing the droplet size in the spray jets. The smaller droplets in the spra~ jets ensure more intensive cooling of the bloom surface, since the individual droplets evaporate more rapidly. Finally, the device of the invention has the special advantage tha-t -the two spray jets do not intersect, but are both directed outwardly. This facilitates a very simple nozzle housing construction.
The object of the present invention is to provide such a * published October 18th 1979 ~S~'7~l device with an improved performance so tha-t:
a) a more extensive heat exchange surface is attained by a broader fan-shaped jet, b) a more intensive cooling action is brought about by smaller droplets and the individual droplets can evaporate more rapidly, while c) droplets which do not evaporàte are cleared laterally across the bloom. In addition, it is intended to simplify the nozzle design.
Accordingly, the invention as herein broadly claimed, lies in the provision of a device for spraying a cooling agent on a steel bloom having a bloom surface, comprising: spray nozzles connected to a mixing chamber having separa-te inlets for an impellant and a cooling agent to be mixed in said chamber; nozzle outlets adapted so that the impellant-coolant mixture impinges on the bloom surface in a broad fan and at an acute angle in mutually opposed directions, the nozzle outlets projecting Erom a common nozzle housing into which the mixing chamber opens, said coolant inlet includiny a coolant union on the mixing chamber formed by a replaceable insertion pipe pro-jecting into the mixing chamber, the nozzle housing being essentially cylindrical and having a cylindrical entry bore, while the nozzle outlets are formed by two prismatic milled apertures in the nozzle housing, diametrically opposite each other and each opening radially into the entry bore.
The invention avoids the concept embodied in the device of the prior patent application P 28 16 441.2-24 of providing opposed nozzle outlet openings, i.e. openings directed towards each other. This provides the advantageous possibility of broadening the jet to the required extent without mutual interference between the jets (which would ensue with the device of the above prior patent application).
5~'7~
The concept of the invention, whereby -the nozzle construction is so modified that the jets are no longér directed in opposition to each other, simultaneously leads to a simpler nozzle construction.
Preferably, the cylindrical entry bore of the nozzle housing is formed as a blind hole haviny a hemi-spherically shaped inner end, while the milled lateral apertures forming the nozzle outlets open into the hemi-spherical end-zone of the entry bore in the nozzle housing.
A ~urther preferred feature of the invention consists in that a disc-shaped spinner is provided inside the entry bore in the nozzle housing, in advance of the nozzle outle-ts. The spinner is .
~ - 2a -'7:~.
preferably adapted so that the previously formed mix-ture of water and air, which contains a higher proportion of water in the centre of the mixing chamber (considered radially) than in the peripheral zones, is mixed still more intensively. In this way the average drolet diameter can be advantageously reduced.
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:-Figure 1 is a plan view (taken from the line I-I in Figure 2) of part of a cast ribbon passing between guide rolls;
Figure 2 is a part sectional view taken from the line II-I~
in Figure l;
Figure 3, on a larger scale than that of Figures 1 and 2 is an exploded view of a cooling device (with some parts partly sectioned) in accordance with the invention and for use as indicated in Figures 1 and 2;
Figure 4 is a view of the nozzle housing seen at the bottom oE Figure 3, looking in the direc-tion oE -the arrow A;
Figure 5 is a section taken on the line V-V in Figure 3; and Figure 6 is a plan view of -the spinner half of which can be : seen in the sectioned half of the nozzle housing in Figure 3.
Figures 1 and 2 show pairs of opposed parallel guide rolls 10 ` and 11 in a continuous casting machine for steel blooms. Each steel bloom 12 passes between the guide rolls 10 and 11 of each pair, and successive pairs of guide rolls are disposed with relatively small intermediate spacings a. A cooling device 14 is directed towards the upper face of the steel bloom 12 between each adjacent pair of guide rolls 10.
As shown in more detail in Figure 3, the cooling device 14 comprises a nozzle housing 15 and a mixing chamber 16 having a lateral union 17 to admit an impellant, for example ai.r, and a coaxial union 13 for coolant, for example water.
7~
As Figure 3 further shows, the coolant union 18 is substan-tially adapted as a tubular insert 19 projecting into -the tubular mixing chamber 16. A fixing nut 20 having an internal thread 21 is welded to the upper end of the tubular insert 19. The nut 20 and the thread 21 are used to fix the tubular insert 19 on a corresponding thread 22 on the mixing chamber 16. An external thread 23 is provided on the upper end of the nut 20, for connection to a coolant supply line, normaly for example with the aid of a cap nut. The coolant, water, is admitted into the -tubular insert 10 19 at 23 and passes thence into the mixing chamber 16 at a flow rate which is precisely determined by the internal diameter of the tubular insert 19. Thus, by replacing a given tubular insert 19 by one of larger or smaller diameter, it is a simple matter to adjust the flow rate of cooling water independen-tly of the flow rate of air entering the mixing chamber 16 at 17 and independently of the geometry of the nozzle housing 15. Since the tubular insert 19 can be replaced with ease, various flow rate .ratios of coolant to impellant can be selected wi-th corresponding ease withou-t inter-fering in any way with the nozzle housing 15 itself. Moreover, no ad~ustments need be made for this purpose in the pressure settings of the coolant supply line on the one hand or the impellant supply line on the other.
By reason of the rela-tively large cross-section of the mixing chamber 16 r friction losses in the mixture advancing tc the nozzle are kept low, with the advantageous e.ffect of raising the exit velocity.
~ further advantage in the same sense accrues from the fact that the stream of mixed coolant and impellant in the nozzle housing 15 is divided into two separate streams. As Figure 3 fur-ther shows, the nozzle housing 15 has a cylindrical en-try bore 24, in the form of a blind hole. The entry bore 24 has two shoulders, and an internal thread 25 at its upper end meshes with a correspon-~s~
ding e~ternal thread 26 o~ the mixing chamber 16. The blind hole24 contains a disc-shaped spinnex 27, which is supported axially on a shoulder ~8 in the blind hole 24 of the nozzle housing 15.
Figure 6 shows the spinner 27 in plan view. Its circular periphèry has four milled radial notches 29 spaced at angles of 90 to each other. The spinner 27, in conjunction with the arrangement and construction already described, brings about still more intensive mixing in the mixture of water and air already present in the mixing chamber 16, whereby the average droplet diameter in the je-ts emerging from the nozzle housing 15 can be advantageously reduced still further. It will be seen by reference also to Figures 4 and 5, that the nozzle has two outlets formed by two diametrically opposed prismatic milled apertures 30 and 31 in the nozzle housing 15. The apertures 30 and 31 are milled so that they penetra-te into the blind-hole entry bore 24 in the nozzle housing 15, in a hemi-spherical end-zone 32 o -the entry bore 24 to form two nozzle outlets 33, the shape of each of which is shown particularly clear-ly in Figure 4. The prismatic milled apertures 30 and 31 are inclined at an angle (Figure 3) of 5 relative to their respective planes of symmetry about the horizontal plane of the bloom surface. The nozzle outlets 33 produce two broad fan jets directed in opposite directions (see Figures l and 2). The two fan jets extend in plan view (Figure 1) over a larger angle ~ and at right angles thereto tFigure 2) over a smaller angle ~. The advantage of extending the jet over a wide angle~ is to be seen in that within a short distance from the nozzle outlet the entire breadth of the free bloom surface - seen in the casting direction 13 - is covered with spray. The advantage of extending the je-t over the angle ~
consists in that the incidence zone of the spray jet on the bloom surface - seen in the jet direction 34 - is increased. The planes of the fan jets extending over the angle~lie parallel to the bloom surface. In other words, a larger proportion of he exposed bloom S~7~
surface between guide rolls 10 - denoted by the dimension c in Figure 1 - is covered within a shorter distance from the nozzle housing 15 than can be achieved with the device of the prior Application P 28 16 441.2-24. These advantages, based on the angles c-,~ and~ , significantly improve the uniformity of bloom cooling.
The above advantages appertain to each fan jet individually. The distinction between the fan jets produced by a device in accordance with the invention and by the prior device of P 28 16 441.2-24 is substantially charac-terised in that individual fan jets are produced, having a broad extent (angle ~) and little widening at right angles thereto (an~le ~), whereas the device of the prior Application P.28 16 441.2-~4 produces somewhat flattened oval jets from approximately circular initial jets.
Another significant distinction from the prior device of P
28 16 441.2-24 consists in that the nozzle housing 15 is located no further than 150 mm from the nozzle-facing end of the tubular insert 19 in the mixing chamber 16. This dimension b is shown in Figure 3. It relates o course ot the assembled state of the individual components and not as shown exploded in Figure 3.
Figures 1 and 2 also disclose a further significant feature of the invention~ This consists in that the successive spray a rra~ ~c~
devices 14 ~}}i~Y~ in the casting direction 13 are alternately dis-placed through a distance d from the cen-tral axis 35 of the cast ribbon, first to the left and then to the right. The lateral displa-cement d of each spray device 14 is adjusted according to the width e of the sprayin~ gap. In fact, as Figure 2 shows, it amounts to about half the breadth f of the unsprayed bloom surface. Since the spray device in the next guide-roll gap is displaced over the same distance d on the other side of the central axis 35, the entire breadth of the bloom 12 is covered with liquid by a pair of cooling devices 14.
To summarise, the following significant advantages accrue from the device of the invention:
The prismatic apertùres 30,3,l ~orming the nozz~e outlets 33, each spraying outwards from the central axis of the mixing chamber 16, produce fan jets the angular dimensions (~ and ~ ) of which can be adjusted by varying the geometry of the entry bore 24 and of the apertures 30,31. This facilitates a more uniform coverage of the bloom surface re~uiring cooling. The mixing chamber 16 in conjunction with the spinner 27 in the nozzle housing 15 produces more effective mixing between the water and air, thereby reducing the droplet size in the spray jets. The smaller droplets in the spra~ jets ensure more intensive cooling of the bloom surface, since the individual droplets evaporate more rapidly. Finally, the device of the invention has the special advantage tha-t -the two spray jets do not intersect, but are both directed outwardly. This facilitates a very simple nozzle housing construction.
Claims (9)
1. A device for spraying a cooling agent on a steel bloom having a bloom surface, comprising: spray nozzles connected to a mixing chamber having separate inlets for an impellant and a cooling agent to be mixed in said chamber; nozzle outlets adapted so that the impellant-coolant mixture impinges on the bloom surface in a broad fan and at an acute angle in mutually opposed directions, the nozzle outlets projecting from a common nozzle housing into which the mixing chamber opens, said coolant inlet including a coolant union on the mixing chamber formed by a replaceable insertion pipe pro-jecting into the mixing chamber, the nozzle housing being essentially cylindrical and having a cylindrical entry bore, while the nozzle outlets are formed by two prismatic milled apertures in the nozzle housing, diametrically opposite each other and each opening radially into the entry bore.
2. A device as in claim 1, wherein the nozzle outlets are milled at an angle of 2-10° relative to the bloom surface.
3. A device as claimed in claim 1, wherein said angle is 5°.
4. A device as in claim 1, wherein the cylindrical entry bore in the nozzle housing is a blind hole having a hemispherical end-zone.
5. A device as in claim 4, wherein the milled apertures forming the lateral nozzle outlets open into the hemispherical end-zone of the entry bore in the nozzle housing.
6. A device as in claims 1, 2 or 4, wherein a disc-shaped spinner is provided in front of the nozzle outlets in the entry bore in the nozzle housing.
7. A device as in claims 1, 2 or 4, wherein the nozzle housing is mounted at a distance of no more than 150 mm from the nozzle end of the tubular insert in the mixing chamber.
8. Advice as claimed in claims 1, 2 or 4, for use in a continuous casting installation from which a bloom emerges in the form of a cast ribbon passing between successive pairs of guide rolls, said device being disposed between each adjacent pair of guide rolls on the upper surface of the cast ribbon, and successive like spray devices are alternately displaced through a certain distance on either side of the central axis of the cast ribbon.
9. An installation as in claims 1, 2 or 4, for use in a continuous casting installation from which a bloom emerges in the form of a cast ribbon passing between successive pairs of guide rolls, said device being disposed between each adjacent pair of guide rolls on the upper surface of the cast ribbon, and successive like spray devices are alternately displaced through a certain distance on either side of the central axis of the cast ribbon, and wherein the lateral dis-placement of the spray devices is about half the breadth of the unwetted broom surface.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3004864.7-24 | 1980-02-09 | ||
| DE3004864A DE3004864C2 (en) | 1980-02-09 | 1980-02-09 | Device for spraying a propellant and cooling agent mixture onto cast strands |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1165971A true CA1165971A (en) | 1984-04-24 |
Family
ID=6094206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000370177A Expired CA1165971A (en) | 1980-02-09 | 1981-02-05 | Device for spraying cooling agent on steel blooms |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS56122654A (en) |
| AT (1) | AT381881B (en) |
| AU (1) | AU539792B2 (en) |
| BE (1) | BE886955A (en) |
| BR (1) | BR8100478A (en) |
| CA (1) | CA1165971A (en) |
| CH (1) | CH651487A5 (en) |
| DE (1) | DE3004864C2 (en) |
| FR (1) | FR2475435A1 (en) |
| GB (1) | GB2068779B (en) |
| IT (1) | IT1135251B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3239042A1 (en) * | 1982-10-22 | 1984-04-26 | SMS Schloemann-Siemag AG, 4000 Düsseldorf | DEVICE FOR SPRAYING A FUEL AND COOLANT MIXTURE ONTO A STEEL SLAM |
| AT375853B (en) * | 1983-02-15 | 1984-09-25 | Voest Alpine Ag | JET NOZZLE |
| FR2560967B1 (en) * | 1984-03-08 | 1988-08-26 | Creusot Loire | METHOD AND APPARATUS FOR CONTROLLING THE THERMAL TRANSFER CARRIED OUT IN A FLUIDIZED BED |
| DE3425092A1 (en) * | 1984-07-07 | 1986-02-06 | SMS Schloemann-Siemag AG, 4000 Düsseldorf | METHOD AND DEVICE FOR COOLING CONTINUOUSLY DELIVERED Pouring Strands in a Continuous Casting Plant |
| DE3834670A1 (en) * | 1987-10-14 | 1989-04-27 | Spraying Systems Deutschland G | Nozzle for the discharge of liquid fertiliser |
| EP1356868B1 (en) * | 2002-04-18 | 2003-12-03 | Lechler GmbH | Binary jet nozzle with exchangeable insert |
| KR100981562B1 (en) | 2003-04-25 | 2010-09-10 | 주식회사 포스코 | Continuous slab chiller with temperature control |
| DE102015204664A1 (en) * | 2015-03-16 | 2016-09-22 | Lechler Gmbh | Flat jet nozzle and use of a flat jet nozzle |
| CN113414163A (en) * | 2021-06-17 | 2021-09-21 | 顾濳刚 | Method for medical cleaning, rinsing and hot blow drying |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2746795A (en) * | 1953-04-16 | 1956-05-22 | R B Mfg Corp | Diffusing apparatus |
| US3567116A (en) * | 1968-12-18 | 1971-03-02 | Minnesota Mining & Mfg | Atomizing method and apparatus |
| DE2816441C2 (en) * | 1978-04-15 | 1982-01-14 | Lechler Gmbh & Co Kg, 7012 Fellbach | Device for spraying a propellant and coolant onto a continuously cast steel slab |
-
1980
- 1980-02-09 DE DE3004864A patent/DE3004864C2/en not_active Expired
- 1980-11-24 AT AT0571680A patent/AT381881B/en not_active IP Right Cessation
- 1980-12-05 GB GB8039118A patent/GB2068779B/en not_active Expired
-
1981
- 1981-01-05 BE BE0/203393A patent/BE886955A/en not_active IP Right Cessation
- 1981-01-28 BR BR8100478A patent/BR8100478A/en unknown
- 1981-01-30 IT IT19444/81A patent/IT1135251B/en active
- 1981-01-30 CH CH605/81A patent/CH651487A5/en not_active IP Right Cessation
- 1981-02-02 AU AU66812/81A patent/AU539792B2/en not_active Ceased
- 1981-02-05 CA CA000370177A patent/CA1165971A/en not_active Expired
- 1981-02-06 JP JP1585481A patent/JPS56122654A/en active Pending
- 1981-02-06 FR FR8102340A patent/FR2475435A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| GB2068779A (en) | 1981-08-19 |
| FR2475435B1 (en) | 1984-01-13 |
| BE886955A (en) | 1981-05-04 |
| IT8119444A0 (en) | 1981-01-30 |
| DE3004864C2 (en) | 1983-12-29 |
| CH651487A5 (en) | 1985-09-30 |
| AU6681281A (en) | 1981-08-13 |
| DE3004864A1 (en) | 1981-08-27 |
| JPS56122654A (en) | 1981-09-26 |
| GB2068779B (en) | 1984-01-25 |
| AT381881B (en) | 1986-12-10 |
| BR8100478A (en) | 1981-08-18 |
| IT1135251B (en) | 1986-08-20 |
| ATA571680A (en) | 1986-05-15 |
| AU539792B2 (en) | 1984-10-18 |
| FR2475435A1 (en) | 1981-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |