CN107671252A - A kind of Continuous Casting Secondary Cooling system - Google Patents
A kind of Continuous Casting Secondary Cooling system Download PDFInfo
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- CN107671252A CN107671252A CN201710906379.6A CN201710906379A CN107671252A CN 107671252 A CN107671252 A CN 107671252A CN 201710906379 A CN201710906379 A CN 201710906379A CN 107671252 A CN107671252 A CN 107671252A
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- Prior art keywords
- cooling
- continuous casting
- strand
- cooling water
- branch pipe
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- 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
- B22D11/1243—Accessories for subsequent treating or working cast stock in situ for cooling by using cooling grids or cooling plates
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- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The present invention discloses a kind of Continuous Casting Secondary Cooling system, including cooling down supply mains, described cooling supply mains distributes some cooling water branch pipes, every cooling water branch pipe respectively leads to several cooling subregions set on strand length direction, some nozzles in covering cooling partition length region are set on cooling water branch pipe, control unit is both provided with every cooling water branch pipe, and is sequentially reduced along the caliber of strand direction of growth cooling water branch pipe.Continuous Casting Secondary Cooling system of the present invention distributes to water by changing the bore of cooling water branch pipe according to cooling water demand, control unit is set flexibly accurately to adjust the cooling water inflow sprayed from nozzle, avoid the occurrence of adjustable range it is excessive and the problem of cause degree of regulation deficiency, avoiding the occurrence of water distribution quantity situation bigger than normal causes casting blank surface temperature too low and face crack is formed under straightening force effect, ensures the strand quality of production.
Description
Technical field
The present invention relates to continuous casting technical field, more particularly to a kind of Continuous Casting Secondary Cooling system.
Background technology
In casting process, the whether fine or not of secondary cooling plays critically important effect to slab quality, control it is good, can
Effectively to prevent the generation of various surface defects and internal flaw.Two cold water distributions are unreasonable, easily produce following quality problems：
If each section of two cold-zones inhomogeneous cooling is even, cooling stress is produced so that casting blank surface temperature, which is presented, periodically to go up, and causes base
Shell expands, and produces middle crack and subcrack；Due to two cold improper, casting blank surface temperature is less than 900 degree during aligning, just position
In brittle zone, face crack is formed under straightening force effect；If cooling is too weak, surface temperature is too high, makees in ferrostatic pressure
Under, solidified shell can occur creep and produce bulge.Two cold intensities of cooling also have an impact to center segregation of casting blank, generally,
As intensity of cooling weakens, in the case of pulling rate is constant, solidification end increase, ferrostatic pressure increase, easily aggravate segregation,
It is also easy to produce centre burst simultaneously.Currently used Continuous Casting Secondary Cooling system there is atomization instability of flow situation, especially
It is that control accuracy is low in low discharge, can not stable regulation, it is difficult to realize optimal cooling effect, it will usually it is inclined water distribution quantity occur
Big situation, cause casting blank surface temperature too low and form face crack under straightening force effect, have a strong impact on slab quality.
The content of the invention
The technical problems to be solved by the invention and the technical assignment proposed are that prior art is improved, there is provided a kind of
Continuous Casting Secondary Cooling system, solve Continuous Casting Secondary Cooling system traditional in current technology and be difficult to accurate adjustment control water distribution quantity,
Easily occur water distribution quantity it is bigger than normal influence slab quality the problem of.
To solve above technical problem, the technical scheme is that：
A kind of Continuous Casting Secondary Cooling system, it is characterised in that including cooling down supply mains, described cooling supply mains distributes
Some cooling water branch pipes, every cooling water branch pipe respectively lead to several cooling subregions set on strand length direction,
Some nozzles in covering cooling partition length region are set on cooling water branch pipe, and it is single to be both provided with control on every cooling water branch pipe
Member, and be sequentially reduced along the caliber of strand direction of growth cooling water branch pipe.Continuous Casting Secondary Cooling system of the present invention is adopted
With the cooling water branch pipe of different tube diameters come reasonable distribution confluent, bigger cooling water is more needed at crystallizer in strand
Dosage, and it is fewer and fewer along strand direction of growth cooling water amount, by changing the bore of cooling water branch pipe come close to knot
The cooling subregion of brilliant device has enough cooling water supplies, and there was only less amount of cooling water in the cooling subregion away from crystallizer
Supply, the cooling water inflow sprayed from nozzle flexibly can accurately be adjusted by the control unit matched with cooling water branch pipe, kept away
Exempt to occur adjustable range it is excessive and the problem of cause degree of regulation deficiency, ensure accurate water distribution quantity, it is ensured that realize optimal cold
But effect, avoid casting blank surface temperature too low and face crack is formed under straightening force effect, ensure slab quality.
Further, described control unit includes flow control valve, adjusts the cooling water of this cooling water branch pipe output
Amount, it is easy to adjust, reliable, precision is high.
Further, described control unit also includes stop valve and flowmeter, counts water distribution quantity, and can also pass through
Stop valve further regulates and controls water distribution quantity, ensures cooling effect.
Further, pressure-air branch road is also connected with described cooling water branch pipe, is provided with pressure-air branch road
It check-valves, can be effectively atomized by conveying high-pressure air cooling water, effectively cooling can be carried out on a large scale to strand, is improved
The uniformity of cooling, avoiding cooling water from drop occur causes strand local cooling and causes casting blank cleavage, ensures strand production matter
Amount.When Casting speed is too low, cooling water inflow diminishes, and atomization gas is controlled using constant pressure：When i.e. fluid flow changes, mist
The pressure for changing gas keeps constant.Constant pressure controls, simple system, low cost, and Operation and maintenance are convenient, meet low-alloy knot
Two cold water distribution requirements of steel.
Further, filter is provided with described cooling supply mains, effective impurity screening, avoids impurity from blocking spray
Mouth, it is ensured that cooling water can effectively be atomized the cooling down to be stablized to strand.
Further, the length of several described cooling subregions increases successively along the strand direction of growth, firm in strand
Progress is strong cold when being come out from crystallizer, by big yield strand fast cooling, generates stable green shell, avoids the occurrence of bleed-out
Situation, and back segment carry out weak cold so that strand slow cooling, avoid the occurrence of cracking etc. undesirable condition.
Further, the water distribution quantity of several described cooling subregions reduces successively along the strand direction of growth.
Further, the water distribution quantity of described cooling subregion is reduced and reduced with the pulling rate of strand, avoids water distribution quantity bigger than normal
Cause casting blank surface temperature too low and form face crack under straightening force effect.
Further, described cooling subregion is provided with four sections, along strand conveying direction cool down subregion length according to
Secondary is 365mm, 1786mm, 1880mm, 2676mm.
Further, the water distribution quantity of described cooling subregion is followed successively by 10.5~22.5M along the strand direction of growth3/h、4
~5.5M3/ h, 3.0~3.7M3/ h, 1.8~~2.3M3/h。
Compared with prior art, the invention has the advantages that：
Continuous Casting Secondary Cooling system of the present invention distributes to water according to cooling water demand, by changing cooling water
The bore of branch pipe causes the cooling subregion close to crystallizer to have enough cooling water supplies, and in the cooling of remote crystallizer
Subregion only has less amount of cooling water supply, control unit is flexibly accurately adjusted the cooling water inflow sprayed from nozzle,
Avoid the occurrence of adjustable range it is excessive and the problem of cause degree of regulation deficiency, avoiding the occurrence of water distribution quantity situation bigger than normal causes strand
Surface temperature is too low and face crack is formed under straightening force effect, ensures the strand quality of production.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described,
Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of protection of the invention.
A kind of Continuous Casting Secondary Cooling system, accurately can flexibly control water distribution quantity disclosed in the embodiment of the present invention so that
Water distribution quantity can accurately match Casting speed, be to improve the water distribution quantity control accuracy in low pulling rate by it, it is ensured that realize optimal
Cooling effect, avoid casting blank surface temperature too low and face crack is formed under straightening force effect, ensure slab quality.
As shown in figure 1, a kind of Continuous Casting Secondary Cooling system, including cooling supply mains 1, cooling supply mains 1 distribute some
Root cooling water branch pipe 2, every cooling water branch pipe 2 respectively leads to several cooling subregions set on the length direction of strand 5, cold
Some nozzles 3 in covering cooling partition length region are but set on water branch pipe 2, cools down and is provided with filter 11 on supply mains 1,
Effective impurity screening, avoid impurity plug nozzle, it is ensured that cooling water is effectively atomized, and strand 5 uniformly can be cooled down, every cold
But control unit 4 is both provided with water branch pipe 2, control unit 4 includes flow control valve 6, stop valve 7 and flowmeter 8, and edge
The caliber of the direction of growth cooling water branch pipe 2 of strand 5 is sequentially reduced.
Pressure-air branch road 9 is also connected with cooling water branch pipe 2, check-valves 10 is provided with pressure-air branch road 9, passes through
Conveying high-pressure air enables cooling water to be effectively atomized, and effectively cooling can be carried out on a large scale to strand, improves the uniform of cooling
Property.
The length of cooling subregion increases successively along the direction of growth of strand 5, and cools down the water distribution quantity of subregion along strand 5
The direction of growth reduces successively, cools down the water distribution quantity of subregion and reduces and reduce with the pulling rate of strand 5, has just been come out in strand from crystallizer
Shi Jinhang is cold by force, passes through big yield strand fast cooling so that casting billet surface is frozen into green shell, avoids cooling too weak and nothing
Method effectively reduces surface temperature, and under ferrostatic pressure effect, solidified shell can occur creep and produce bulge, and back segment carries out weak
It is cold so that strand slow cooling, to avoid casting blank surface temperature too low and form face crack under straightening force effect.
In the present embodiment, cooling subregion is provided with four sections, and the length of subregion is cooled down successively along the conveying direction of strand 5
For 365mm, 1786mm, 1880mm, 2676mm, cool down the water distribution quantity of subregion be followed successively by 10.5 along the direction of growth of strand 5~
22.5M3/ h, 4~5.5M3/ h, 3.0~3.7M3/ h, 1.8~~2.3M3/h。
In strand production process, pulling rate is 1.0~1.2m/min, and the wide face centre of surface temperature of strand is from when going out crystallizer
1499 DEG C be gradually dropped to 1042 DEG C, in whole cooling procedure, temperature fluctuates 2~3 sections of intermediate regions, and fluctuating range is small
In 100 DEG C, other each sections also have minor swing, belong to normal phenomenon of rising again.Leptoprosopy centre of surface temperature is when going out crystallizer
1497 DEG C, between being 964 DEG C when reaching calculating terminal, compared with wide face centre of surface temperature, temperature fall is larger,
Amplitude of rising again is also slightly smaller, belongs to normal phenomenon of rising again.When strand row is to apart from meniscus 8.24m, solidified shell
Thickness has just reached 90m.When strand enters aligning section, wick-containing solidifies completely, and surface temperature is all higher than 950 DEG C, is entirely capable of
Avoid the generation of surface transverse fissure, centre burst and middle crack.
It the above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
The limitation of the present invention, protection scope of the present invention should be defined by claim limited range.For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, some improvements and modifications can also be made, these change
Enter and retouch and also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of Continuous Casting Secondary Cooling system, it is characterised in that including cooling supply mains (1), described cooling supply mains (1) point
Some cooling water branch pipes (2) are flowed out, every cooling water branch pipe (2) respectively leads to what is set in strand (5) if on length direction
Dry cools down subregion, and some nozzles (3) in covering cooling partition length region, every cooling water are set on cooling water branch pipe (2)
Control unit (4) is both provided with branch pipe (2), and is subtracted successively along the caliber of strand (5) direction of growth cooling water branch pipe (2)
It is small.
2. Continuous Casting Secondary Cooling system according to claim 1, it is characterised in that described control unit (4) includes stream
Adjustable valve (6).
3. Continuous Casting Secondary Cooling system according to claim 2, it is characterised in that described control unit (4) also includes
Stop valve (7) and flowmeter (8).
4. Continuous Casting Secondary Cooling system according to claim 1, it is characterised in that on described cooling water branch pipe (2) also
Pressure-air branch road (9) is connected to, check-valves (10) is provided with pressure-air branch road (9).
5. Continuous Casting Secondary Cooling system according to claim 1, it is characterised in that set on described cooling supply mains (1)
Filter (11) is put.
6. Continuous Casting Secondary Cooling system according to claim 1, it is characterised in that the length of several described cooling subregions
Degree increases successively along strand (5) direction of growth.
7. Continuous Casting Secondary Cooling system according to claim 6, it is characterised in that several described cooling subregions are matched somebody with somebody
Water reduces successively along strand (5) direction of growth.
8. Continuous Casting Secondary Cooling system according to claim 7, it is characterised in that the water distribution quantity of described cooling subregion with
The pulling rate of strand (5) is reduced and reduced.
9. Continuous Casting Secondary Cooling system according to claim 1, it is characterised in that described cooling subregion is provided with four
Section, the length that subregion is cooled down along the conveying direction of strand (5) are followed successively by 365mm, 1786mm, 1880mm, 2676mm.
10. Continuous Casting Secondary Cooling system according to claim 9, it is characterised in that the water distribution quantity of described cooling subregion
10.5~22.5M is followed successively by along strand (5) direction of growth3/ h, 4~5.5M3/ h, 3.0~3.7M3/ h, 1.8~~2.3M3/
h。
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| CN201710906379.6A CN107671252A (en) | 2017-09-29 | 2017-09-29 | A kind of Continuous Casting Secondary Cooling system |
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| CN201710906379.6A CN107671252A (en) | 2017-09-29 | 2017-09-29 | A kind of Continuous Casting Secondary Cooling system |
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Cited By (4)
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|---|---|---|---|---|
| CN109351927A (en) * | 2018-12-05 | 2019-02-19 | 联峰钢铁（张家港）有限公司 | A kind of conticaster crystallizer cooling water recirculation system |
| CN111545715A (en) * | 2019-02-12 | 2020-08-18 | 株式会社神户制钢所 | Continuous casting mold, continuous casting device, and continuous casting method |
| CN111715861A (en) * | 2020-05-26 | 2020-09-29 | 武汉钢铁有限公司 | Full thickness segregation control method for medium-high carbon steel casting blank in thin slab continuous casting |
| CN114799109A (en) * | 2022-04-13 | 2022-07-29 | 武汉钢铁有限公司 | Intelligent determination system and method for continuous casting fan-shaped section nozzle blockage condition |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109351927A (en) * | 2018-12-05 | 2019-02-19 | 联峰钢铁（张家港）有限公司 | A kind of conticaster crystallizer cooling water recirculation system |
| CN111545715A (en) * | 2019-02-12 | 2020-08-18 | 株式会社神户制钢所 | Continuous casting mold, continuous casting device, and continuous casting method |
| CN111715861A (en) * | 2020-05-26 | 2020-09-29 | 武汉钢铁有限公司 | Full thickness segregation control method for medium-high carbon steel casting blank in thin slab continuous casting |
| CN111715861B (en) * | 2020-05-26 | 2022-05-31 | 武汉钢铁有限公司 | Full thickness segregation control method for medium-high carbon steel casting blank in thin slab continuous casting |
| CN114799109A (en) * | 2022-04-13 | 2022-07-29 | 武汉钢铁有限公司 | Intelligent determination system and method for continuous casting fan-shaped section nozzle blockage condition |
| CN114799109B (en) * | 2022-04-13 | 2024-01-30 | 武汉钢铁有限公司 | Intelligent judgment method for blocking condition of continuous casting fan-shaped section nozzle |
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