CN112170799A - Slab caster fan-shaped section cooling device and control method - Google Patents
Slab caster fan-shaped section cooling device and control method Download PDFInfo
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- CN112170799A CN112170799A CN202011058840.5A CN202011058840A CN112170799A CN 112170799 A CN112170799 A CN 112170799A CN 202011058840 A CN202011058840 A CN 202011058840A CN 112170799 A CN112170799 A CN 112170799A
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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
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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
- B22D11/1246—Nozzles; Spray heads
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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Abstract
The invention discloses a cooling device and a control method for a sector section of a slab continuous casting machine, which are applied to the last sector section in the continuous casting machine, wherein the cooling device comprises: the device comprises a frame, a plurality of groups of upper conveying rollers and lower conveying rollers which are matched with each other are uniformly distributed at intervals along the running direction of a plate blank; a row of nozzle rod pieces are arranged at the positions, located at the two sides of each group of upper conveying roller and lower conveying roller, of the rack, and each row of nozzle rod pieces comprises a plurality of nozzle rod pieces which are distributed at intervals; the nozzles of the nozzle rod pieces are used for spraying cooling water columns towards the upper surface and the lower surface of the plate blank, and the cooling water columns are sectors with preset angles; in one row of nozzle member, there is the overlap in the sector of the cooling water column that two adjacent nozzle member sprays and form, and this cooling device can carry out even cooling to the upper and lower surface of slab, and then carries out forced cooling to this slab, can reduce the slab scaling loss simultaneously and reduce the iron and steel material consumption.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a cooling device for a sector section of a slab continuous casting machine and a control method.
Background
The slab hot charging is a production organization mode for reducing the heating time in a hot rolling heating furnace by utilizing the residual heat of the slab, has the advantages of reducing the fuel consumption of the heating furnace, saving the cost, reducing the slab burning loss, reducing the consumption of steel materials and the like, and is a high-level embodiment of enterprise management.
However, the applicant finds that warm feeding (450 ℃ -550 ℃) or cold feeding of the slab is not beneficial to reducing fuel consumption of the heating furnace and saving cost, and when the slab which is subjected to ordinary cooling and is not subjected to forced cooling is directly loaded into the heating furnace, the steel plate obtained by post rolling is easy to have the claw crack defect of the whole plate surface, which is called as hot charging crack, and the existence of the hot charging crack severely limits the hot charging temperature and the hot charging proportion, so that the problem is urgently needed to be solved.
Disclosure of Invention
The embodiment of the application provides a cooling device and a control method for a fan-shaped section of a slab continuous casting machine, and solves the technical problem that when a slab subjected to common cooling is directly loaded into a heating furnace at present, the claw crack defect of the whole slab surface of a steel plate obtained by later-stage rolling is easy to occur.
In a first aspect, the present application provides the following technical solutions through an embodiment of the present application:
a slab caster segment cooling apparatus for use in a last segment of a caster, said cooling apparatus comprising: the plate blank conveying device comprises a machine frame, wherein a plurality of groups of upper conveying rollers and lower conveying rollers which are matched with each other are uniformly distributed at intervals along the running direction of a plate blank on the machine frame; a row of nozzle rod pieces are arranged at the positions, located at the two sides of each group of the upper conveying roller and the lower conveying roller, of the rack, and each row of nozzle rod pieces comprises a plurality of nozzle rod pieces which are distributed at intervals; the nozzles of the nozzle rod pieces are used for spraying cooling water columns towards the upper surface and the lower surface of the plate blank, and the cooling water columns are sectors with preset angles; in the row of nozzle rod pieces, the sectors of the cooling water columns formed by spraying of the adjacent two nozzle rod pieces are overlapped.
In one embodiment, the row of nozzle bars comprises 5-10 nozzle bars, and a first distance is maintained between two adjacent nozzle bars.
In one embodiment, the first pitch is 100mm to 600 mm.
In one embodiment, the predetermined angle is 80-120 °.
In one embodiment, the nozzle bars disposed at both sides of the upper transfer roller are first nozzle bars, and the nozzle bars disposed at both sides of the lower transfer roller are second nozzle bars; first nozzle member the nozzle be used for court the upper surface of slab sprays cooling water column, second nozzle member the nozzle be used for court the lower surface of slab sprays cooling water column.
In one embodiment, the nozzles of the first nozzle bar and the upper surface of the slab and the nozzles of the second nozzle bar and the lower surface of the slab are maintained at a second interval, respectively, the second interval being 100mm to 400 mm.
In one embodiment, 6 groups of the upper conveying rollers and the lower conveying rollers which are matched with each other are uniformly distributed on the machine frame at intervals.
In one embodiment, the distance between two adjacent groups of the upper conveying rollers and the lower conveying rollers is kept between 30mm and 100 mm.
In a second aspect, the present application provides the following technical solutions through an embodiment of the present application:
a method for controlling a segment of a slab caster, applied to a segment cooling apparatus of the slab caster described in any one of the above, the method comprising: controlling the amount of water sprayed by the nozzles of the nozzle rod pieces towards the upper surface of the plate blank to be 100L/min-2000L/min; controlling the amount of water sprayed by the nozzles of the nozzle rod piece towards the lower surface of the slab to be 1000-20000L/min.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the slab is gradually cooled in the blank drawing process of the continuous casting machine, when the last sector is reached, the surface temperature of the slab is reduced to 800-900 ℃, and the surface structure of the slab is a fully austenitic structure, so the sector cooling device of the slab continuous casting machine provided by the application modifies the last sector, when the surface structure of the slab is in the fully austenitic structure, the slab can be forcibly cooled by using the cooling device, the surface of the slab is rapidly cooled to 200-500 ℃, a compact fine grain layer is formed on the surface, the grains of the part of the structure are fine and uniform, the heat in the subsequent slab can return the part of the structure, the surface of the slab is continuously heated to 600-700 ℃, the slab enters a heating furnace at the temperature, the surface structure has good capability of being lower than the rolling force, and the generation of 'hot charging cracks' can be effectively prevented, meanwhile, compared with the warm delivery at 450-550 ℃ or cold delivery, the method can reduce the burning loss of the plate blank and reduce the consumption of steel materials, and solves the technical problem that the claw crack defect of the whole plate surface of a steel plate obtained by later rolling is easy to occur when the common cooled plate blank is directly loaded into a heating furnace in the prior art.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a side view of a cooling device for a segment of a slab caster according to an embodiment of the present application;
fig. 2 is a cross-sectional view of a cooling device for a segment of a slab caster according to an embodiment of the present application;
fig. 3 is a flowchart of a method for controlling a segment of a slab caster according to a second embodiment of the present application.
Detailed Description
The embodiment of the application provides a cooling device and a control method for a fan-shaped section of a slab continuous casting machine, and solves the technical problem that when a slab subjected to common cooling is directly loaded into a heating furnace at present, the claw crack defect of the whole slab surface of a steel plate obtained by later-stage rolling is easy to occur.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the application provides a fan-shaped section cooling device of slab caster uses the last fan-shaped section in the conticaster, cooling device includes: the plate blank conveying device comprises a machine frame, wherein a plurality of groups of upper conveying rollers and lower conveying rollers which are matched with each other are uniformly distributed at intervals along the running direction of a plate blank on the machine frame; a row of nozzle rod pieces are arranged at the positions, located at the two sides of each group of the upper conveying roller and the lower conveying roller, of the rack, and each row of nozzle rod pieces comprises a plurality of nozzle rod pieces which are distributed at intervals; the nozzles of the nozzle rod pieces are used for spraying cooling water columns towards the upper surface and the lower surface of the plate blank, and the cooling water columns are sectors with preset angles; in the row of nozzle rod pieces, the fan-shaped surfaces of the cooling water columns formed by spraying of the adjacent two nozzle rod pieces are overlapped, and the cooling device can uniformly cool the upper surface and the lower surface of the plate blank and further forcibly cool the plate blank.
Because the slab is gradually cooled in the blank drawing process of the continuous casting machine, when the last sector is reached, the surface temperature of the slab is reduced to 800-900 ℃, and the surface structure of the slab is a fully austenitic structure, the sector cooling device of the slab continuous casting machine provided by the application modifies the last sector, can be used for forcibly cooling the slab when the surface structure of the slab is in the fully austenitic structure, so that the surface of the slab is rapidly cooled to 200-500 ℃, a compact fine grain layer is formed on the surface, the grains of the part of the structure are fine and uniform, the heat in the subsequent slab can return the part of the structure, the surface of the slab is continuously heated to 600-700 ℃, the slab enters a heating furnace at the temperature, the surface structure has good capability of being lower than the rolling force, and the generation of 'hot charging cracks' can be effectively prevented, meanwhile, compared with the warm delivery at 450-550 ℃ or cold delivery, the method can reduce the burning loss of the plate blank and reduce the consumption of steel materials, and solves the technical problem that the claw crack defect of the whole plate surface of a steel plate obtained by later rolling is easy to occur when the common cooled plate blank is directly loaded into a heating furnace in the prior art.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example one
As shown in fig. 1 and 2, the present embodiment provides a cooling device for a sector section of a slab caster, which is applied to a last sector section in a caster, and is suitable for forcibly cooling the surface of a slab 1 having a width W between 1000mm and 3000mm, a thickness D between 100mm and 600mm, and a drawing speed v of the slab 1 between 0.4 m/min and 4.0m/min, so that the surface temperature of the slab 1 is rapidly cooled from 800 ℃ to 900 ℃ to 200 ℃ to 500 ℃, and then the temperature inside the slab 1 is returned to 500 ℃ by using the temperature inside the slab 1, and when the slab 1 enters a heating furnace, the surface temperature of the slab 1 is returned to 500 ℃ to 800 ℃.
In this case, if the slab 1 is directly charged into the furnace, the charged surface temperature of the slab 1 is within 650 to 700 ℃, and the slab 1 is in an austenite + ferrite two-phase region, and proeutectoid ferrite is precipitated at a grain boundary position, AlN is preferentially precipitated at the grain boundary position due to a difference in solubility, and when the slab is fed into the heating furnace and heated, austenite nucleates AlN at the grain boundary position to form mixed crystals having uneven sizes, and claw-shaped cracks are formed at the grain boundary position during rolling.
When the plate blank 1 is conveyed at a warm temperature (450 ℃ C.) or at a cold temperature, the phase transformation from austenite to ferrite and pearlite can be generated on the surface of the plate blank 1, most of AlN and other carbonitrides precipitated on the prior austenite grain boundary are wrapped in newly generated pearlite grains, after the plate blank 1 is reheated in a heating furnace for austenitization, austenite can be nucleated at the position of pearlite lamella, the generated austenite is relatively uniform, and claw crack defects are not easy to generate on the surface after rolling, but the plate blank 1 temperature is greatly reduced by low-temperature hot conveying, the significance of hot conveying of the plate blank 1 is reduced, so that the targeted research on 'hot charging cracks' is needed, the 'hot charging cracks' are reduced and even eliminated, and the hot charging proportion and the hot charging temperature are improved.
The cooling device includes:
the plate blank conveying device comprises a machine frame, wherein a plurality of groups of upper conveying rollers 2 and lower conveying rollers 2 which are matched with each other are uniformly distributed at intervals along the running direction of a plate blank 1 on the machine frame;
a row of nozzle rod pieces 3 are arranged at the positions, located at the two sides of each group of the upper conveying roller 2 and the lower conveying roller 2, of the rack, and each row of nozzle rod pieces 3 comprises a plurality of nozzle rod pieces 3 distributed at intervals;
the nozzles of the nozzle rod pieces 3 are used for spraying cooling water columns towards the upper surface and the lower surface of the plate blank 1, and the cooling water columns are sectors with preset angles alpha;
in the row of nozzle rods 3, the sectors of the cooling water columns formed by spraying of the adjacent two nozzle rods 3 are overlapped.
The application provides a cooling device for a fan-shaped section of a slab 1 continuous casting machine, which is formed by reforming the last fan-shaped section in the continuous casting machine, because the surface temperature of the slab 1 is between 800 ℃ and 900 ℃ and the surface structure of the slab 1 is a full austenite structure after passing through the last fan-shaped section, the forced cooling is carried out at the moment, the surface temperature is reduced to 200 ℃ to 500 ℃, the surface structure can be completely converted into a martensite phase structure, a compact fine crystal layer is formed on the surface of the slab 1, the crystal grains of the part of the structure are fine and uniform, the heat in the subsequent slab 1 can return the temperature of the part of the structure, the surface of the slab 1 is continuously heated to 600 ℃ to 700 ℃, the slab 1 enters a heating furnace at the temperature, the surface structure has good capability of being lower than the rolling force, the generation of 'hot charging cracks' can be effectively prevented, the main mechanism is, before precipitates such as AlN are precipitated, the surface of the plate blank 1 is rapidly cooled, so that the precipitation of the grain boundary of the AlN precipitates can be inhibited, and meanwhile, the plate blank 1 is cooled before austenite does not have phase transformation, so that the surface structure of the plate blank 1 is completely and rapidly transformed, the surface structure is fine and compact, the aim of resisting the external force of rolling is fulfilled, and the incidence rate of hot charging cracks is reduced.
If the temperature is not reached, the surface structure of the slab 1 may be in the austenite-ferrite two-phase region, and at this time, the slab is cooled, and the cooling temperature is changed in phase or precipitates are precipitated, so that pure martensite cannot be obtained but a martensite phase structure containing ferrite is obtained.
As an alternative embodiment, the row of nozzle bars 3 comprises 5-10 nozzle bars 3, and a first distance L is maintained between two adjacent nozzle bars 3.
As an alternative embodiment, the first distance L is 100mm to 600 mm.
As an alternative embodiment, the preset angle α is 80 ° to 120 °.
When a row of nozzle rods 3 comprises 5-10 nozzle rods 3 and the first distance L is 100mm-600mm, the sectors of cooling water columns formed by spraying of two adjacent nozzle rods 3 are overlapped, so that the upper surface and the lower surface of the plate blank 1 can be completely cooled.
As an alternative embodiment, the nozzle bars 3 disposed on both sides of the upper conveying roller 2 are first nozzle bars 3, and the nozzle bars 3 disposed on both sides of the lower conveying roller 2 are second nozzle bars 3;
As an alternative embodiment, the nozzles of the first nozzle bars 3 are respectively maintained at a second distance h from the upper surface of the slab 1 and the nozzles of the second nozzle bars 3 from the lower surface of the slab 1, the second distance h being 100mm to 400 mm.
As an alternative embodiment, 6 groups of the upper conveying rollers 2 and the lower conveying rollers 2 matched with each other are uniformly distributed on the machine frame at intervals.
As an alternative embodiment, the distance between two adjacent sets of the upper conveying rollers 2 and the lower conveying rollers 2 is kept between 30mm and 100 mm.
The cooling device of each embodiment of this application, can guarantee the upper and lower surface cooling of slab 1 even, simultaneously, slab 1 can send into the heating furnace under the condition that surface temperature is higher than more than 550 ℃, the fuel economy cost, and do not have the surperficial claw to split the defect to take place after rolling, secondly, equipment transformation is simple, small in investment, can effectively improve the hot charge temperature and the hot charge proportion of slab 1, finally, in the quick cooling process of slab 1, slab 1 receives the extrusion of upper and lower transfer roller 2, difficult emergence is out of shape, can effectively guarantee the shape and the production rhythm of slab 1.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
because the slab is gradually cooled in the blank drawing process of the continuous casting machine, when the last sector is reached, the surface temperature of the slab is reduced to 800-900 ℃, and the surface structure of the slab is a fully austenitic structure, the sector cooling device of the slab continuous casting machine provided by the application modifies the last sector, can be used for forcibly cooling the slab when the surface structure of the slab 1 is in the fully austenitic structure, can rapidly cool the surface of the slab to 200-500 ℃, forms a compact fine grain layer on the surface, has fine and uniform grains, can be returned by the heat in the subsequent slab, continuously heats the surface of the slab to 600-700 ℃, enters a heating furnace at the temperature, has good capability of being lower than the rolling force of the surface structure, and can effectively prevent the generation of 'hot charging cracks', meanwhile, compared with the warm delivery at 450-550 ℃ or cold delivery, the method can reduce the burning loss of the plate blank and reduce the consumption of steel materials, and solves the technical problem that the claw crack defect of the whole plate surface of a steel plate obtained by later rolling is easy to occur when the common cooled plate blank is directly loaded into a heating furnace in the prior art.
Example two
As shown in fig. 1, 2 and 3, the present embodiment provides a method for controlling a segment of a slab caster, which is applied to a cooling apparatus for a segment of a slab caster 1 according to any one of the first embodiment, and the method includes:
step S101: controlling the amount of water sprayed by the nozzles of the nozzle rod pieces 3 towards the upper surface of the plate blank 1 to be 100L/min-2000L/min;
specifically, the amount of water sprayed toward the upper surface of the slab 1 by the nozzles of the nozzle bars 3 disposed on both sides of the upper conveying roller 2 is controlled to be 100L/min to 2000L/min.
Step S102: the amount of water sprayed by the nozzles of the nozzle bars 3 towards the lower surface of the slab 1 is controlled to be 1000L/min-20000L/min.
Specifically, the amount of water sprayed toward the lower surface of the slab 1 by the nozzles of the nozzle bars 3 disposed on both sides of the lower conveying roller 2 is controlled to be 1000L/min to 20000L/min.
It should be noted that the above steps are only one implementation manner of this embodiment, and in an actual implementation process, step S101 and step S102 are not in sequence.
Since the water spray from the upper surface of the slab 1 is collected on the slab 1 and the water spray from the lower surface is rapidly dropped without remaining on the slab 1, the water spray from the upper surface of the slab 1 should be significantly less than the water spray from the lower surface to ensure the uniformity of the temperature of the upper and lower surfaces of the slab 1.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
because the slab is gradually cooled in the blank drawing process of the continuous casting machine, when the last sector is reached, the surface temperature of the slab is reduced to 800-900 ℃, and the surface structure of the slab is a fully austenitic structure, the sector cooling device of the slab continuous casting machine provided by the application modifies the last sector, can adjust the water amount sprayed by the cooling device towards the upper surface of the slab to be 100-2000L/min and the water amount sprayed towards the lower surface of the slab to be 1000-20000L/min when the surface structure of the slab is in the fully austenitic structure, then forcibly cools the slab to enable the surface of the slab to be rapidly cooled to 200-500 ℃, a compact fine crystal layer is formed on the surface, the crystal grains of the part of the structure are fine and uniform, and the heat in the subsequent slab can restore the temperature of the part of the structure, the surface of the plate blank is continuously heated to 600-700 ℃, the plate blank enters the heating furnace at the temperature, the surface structure has good capability of being lower than the rolling force, the generation of 'hot charging cracks' can be effectively prevented, meanwhile, compared with the temperature of 450-550 ℃ or cold feeding, the plate blank burning loss can be reduced, the consumption of steel and iron materials can be reduced, and the technical problem that when the plate blank which is cooled in the prior art is directly loaded into the heating furnace, the claw crack defect of the whole plate surface of the steel plate obtained by later-stage rolling is easy to occur is solved.
The above embodiments are further illustrated below by means of several specific modification cases, as follows:
case one: reforming the last sector section of the continuous casting, wherein in the production line, the width W of the slab 1 is 2400mm, the thickness D of the slab 1 is 250mm, and the drawing speed v of the slab 1 is 1.5m/min, and the method comprises the following specific steps:
to slab 1 will transform through last sector-shaped section at the throwing in-process, this sector-shaped section contains the upper and lower transfer roller 22 that 6 groups correspond set up, and the interval between the adjacent transfer roller 22 is 65mm, in the both sides of transfer roller 22, inserts nozzle bar 33, inserts 7 rows of nozzle bar 33 in total.
The sector section is seen from the cross section, the sector section totals 7 rows of nozzle bars 33, the number of each row of nozzle bars 33 is 7, the distance between the nozzle of each nozzle bar 33 and the surface of the slab 1 is 200mm, the water sprayed by each nozzle forms a sector, the angle of the sector is 100 degrees, and the distance between every two nozzle bars 33 is 310 mm.
The amount of water Q of the nozzle pins 33 injected toward the upper surface of the slab 1 was controlled to 2000L/min, and the amount of water Q of the nozzle pins 33 injected toward the lower surface of the slab 1 was controlled to 15000L/min.
Through measurement, the surface temperature of the slab 1 at the beginning of cooling is 880 ℃, the surface temperature of the slab 1 after leaving the reconstruction sector is 450 ℃, the subsequent temperature return of the slab 1 is started, and the surface temperature is 650 ℃ when entering a heating furnace.
Case two: reforming the last sector section of the continuous casting, wherein in the production line, the width W of the slab 1 is 2400mm, the thickness D of the slab 1 is 230mm, and the drawing speed v of the slab 1 is 1.5m/min, and the method comprises the following specific steps:
to slab 1 will transform through last sector-shaped section at the throwing in-process, this sector-shaped section contains the upper and lower transfer roller 22 that 6 groups correspond set up, and the interval between the adjacent transfer roller 22 is 65mm, in the both sides of transfer roller 22, inserts nozzle bar 33, inserts 7 rows of nozzle bar 33 in total.
The sector section is seen from the cross section, the sector section totals 7 rows of nozzle bars 33, the number of each row of nozzle bars 33 is 7, the distance between the nozzle of each nozzle bar 33 and the surface of the slab 1 is 300mm, the water sprayed by each nozzle forms a sector, the angle of the sector is 110 degrees, and the distance between every two nozzle bars 33 is 380 mm.
The amount of water Q of the nozzle pins 33 ejected toward the upper surface of the slab 1 was controlled to 1500L/min, and the amount of water Q of the nozzle pins 33 ejected toward the lower surface of the slab 1 was controlled to 10000L/min.
Through measurement, the surface temperature of the slab 1 at the beginning of cooling is 880 ℃, the surface temperature of the slab 1 after leaving the reconstruction sector is 450 ℃, the subsequent temperature return of the slab 1 is started, and the surface temperature is 620 ℃ when entering the heating furnace.
Case three: reforming the last sector section of the continuous casting, wherein in the production line, the width W of the slab 1 is 2400mm, the thickness D of the slab 1 is 200mm, and the drawing speed v of the slab 1 is 1.2m/min, and the method comprises the following specific steps:
to slab 1 will transform through last sector-shaped section at the throwing in-process, this sector-shaped section contains the upper and lower transfer roller 22 that 6 groups correspond set up, and the interval between the adjacent transfer roller 22 is 65mm, in the both sides of transfer roller 22, inserts nozzle bar 33, inserts 7 rows of nozzle bar 33 in total.
The sector section is seen from the cross section, the sector section totals 7 rows of nozzle bars 33, the number of each row of nozzle bars 33 is 7, the distance between the nozzle of each nozzle bar 33 and the surface of the slab 1 is 100mm, the water sprayed by each nozzle forms a sector, the angle of the sector is 100 degrees, and the distance between every two nozzle bars 33 is 240 mm.
The amount of water Q of the nozzle pins 33 injected toward the upper surface of the slab 1 was controlled to 800L/min, and the amount of water Q of the nozzle pins 33 injected toward the lower surface of the slab 1 was controlled to 8000L/min.
Through measurement, the surface temperature of the slab 1 at the beginning of cooling is 880 ℃, the surface temperature of the slab 1 after leaving the reconstruction sector is 450 ℃, the subsequent temperature return of the slab 1 is started, and the surface temperature is 650 ℃ when entering a heating furnace.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A slab caster segment cooling apparatus for use in a last segment of a caster, said cooling apparatus comprising:
the plate blank conveying device comprises a machine frame, wherein a plurality of groups of upper conveying rollers and lower conveying rollers which are matched with each other are uniformly distributed at intervals along the running direction of a plate blank on the machine frame;
a row of nozzle rod pieces are arranged at the positions, located at the two sides of each group of the upper conveying roller and the lower conveying roller, of the rack, and each row of nozzle rod pieces comprises a plurality of nozzle rod pieces which are distributed at intervals;
the nozzles of the nozzle rod pieces are used for spraying cooling water columns towards the upper surface and the lower surface of the plate blank, and the cooling water columns are sectors with preset angles;
in the row of nozzle rod pieces, the sectors of the cooling water columns formed by spraying of the adjacent two nozzle rod pieces are overlapped.
2. The cooling apparatus of claim 1, wherein said row of nozzle bars comprises 5-10 nozzle bars, and a first spacing is maintained between adjacent nozzle bars.
3. A cooling device according to claim 2, wherein the first pitch is 100mm to 600 mm.
4. A cooling device according to claim 3, wherein said predetermined angle is 80 ° to 120 °.
5. The cooling apparatus as claimed in claim 4, wherein the nozzle bars disposed at both sides of the upper transfer roller are first nozzle bars, and the nozzle bars disposed at both sides of the lower transfer roller are second nozzle bars;
first nozzle member the nozzle be used for court the upper surface of slab sprays cooling water column, second nozzle member the nozzle be used for court the lower surface of slab sprays cooling water column.
6. The cooling apparatus according to claim 5, wherein the nozzles of the first nozzle bar are maintained at a second interval from the upper surface of the slab and the nozzles of the second nozzle bar are maintained at a second interval from the lower surface of the slab, respectively, the second interval being 100mm to 400 mm.
7. The cooling apparatus as claimed in claim 6, wherein 6 sets of said upper and lower conveyor rollers are provided at intervals on said frame to cooperate with each other.
8. The cooling apparatus according to claim 7, wherein a distance between adjacent two sets of the upper transfer rollers and the lower transfer rollers is maintained at 30mm to 100 mm.
9. A method for controlling a segment of a slab casting machine, which is applied to the slab casting machine segment cooling apparatus according to any one of claims 1 to 8, the method comprising:
controlling the amount of water sprayed by the nozzles of the nozzle rod pieces towards the upper surface of the plate blank to be 100L/min-2000L/min;
controlling the amount of water sprayed by the nozzles of the nozzle rod piece towards the lower surface of the slab to be 1000-20000L/min.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011058840.5A CN112170799A (en) | 2020-09-30 | 2020-09-30 | Slab caster fan-shaped section cooling device and control method |
| PCT/CN2021/120419 WO2022068699A1 (en) | 2020-09-30 | 2021-09-24 | Cooling device and control method for fan-shaped section of slab continuous casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011058840.5A CN112170799A (en) | 2020-09-30 | 2020-09-30 | Slab caster fan-shaped section cooling device and control method |
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| CN112170799A true CN112170799A (en) | 2021-01-05 |
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| CN202011058840.5A Pending CN112170799A (en) | 2020-09-30 | 2020-09-30 | Slab caster fan-shaped section cooling device and control method |
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| WO (1) | WO2022068699A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022068699A1 (en) * | 2020-09-30 | 2022-04-07 | 首钢集团有限公司 | Cooling device and control method for fan-shaped section of slab continuous casting machine |
| 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 |
Citations (9)
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| CN112170799A (en) * | 2020-09-30 | 2021-01-05 | 首钢集团有限公司 | Slab caster fan-shaped section cooling device and control method |
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| 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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| WO2022068699A1 (en) | 2022-04-07 |
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