U.S. patent application number 16/469797 was filed with the patent office on 2020-03-12 for cooling system.
The applicant listed for this patent is POSCO. Invention is credited to Jong-Hoon Kang, Seong-Hyun Ko, Pil-Jong Lee, Gwan-Sik Min, Jae-Jyung Seo.
Application Number | 20200080168 16/469797 |
Document ID | / |
Family ID | 62559683 |
Filed Date | 2020-03-12 |
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United States Patent
Application |
20200080168 |
Kind Code |
A1 |
Lee; Pil-Jong ; et
al. |
March 12, 2020 |
Cooling System
Abstract
A cooling system according to an embodiment of the present
invention may comprise: a cooling part which supplies a cooling
fluid to a strip; and a boiling film removal part, which physically
comes into contact with the strip and removes a boiling film formed
by the cooling fluid. The boiling film removal part according to
the embodiment may be disposed at a position where a nuclear
boiling and a film boiling are mixed together along a widthwise
direction of the strip.
Inventors: |
Lee; Pil-Jong; (Pohang-si,
Gyeongsangbuk-do, KR) ; Seo; Jae-Jyung; (Pohang-si,
Gyeongsangbuk-do, KR) ; Ko; Seong-Hyun; (Pohang-si,
Gyeongsangbuk-do, KR) ; Kang; Jong-Hoon; (Pohang-si,
Gyeongsangbuk-do, KR) ; Min; Gwan-Sik; (Pohang-si,
Gyeongsangbuk-do, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
POSCO |
Pohang-si, Gyeongsangbuk-do |
|
KR |
|
|
Family ID: |
62559683 |
Appl. No.: |
16/469797 |
Filed: |
December 15, 2017 |
PCT Filed: |
December 15, 2017 |
PCT NO: |
PCT/KR2017/014889 |
371 Date: |
June 14, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B21B 45/02 20130101;
B21B 45/0281 20130101; C21D 9/52 20130101; B21B 38/006 20130101;
C21D 11/005 20130101; B21B 38/00 20130101; B21B 45/0218 20130101;
B21B 38/02 20130101; C21D 1/62 20130101 |
International
Class: |
C21D 11/00 20060101
C21D011/00; C21D 9/52 20060101 C21D009/52; C21D 1/62 20060101
C21D001/62 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 16, 2016 |
KR |
10-2016-0172449 |
Claims
1. A cooling system comprising: a cooling part which supplies a
cooling fluid to a strip; and a boiling film removal part which
physically comes into contact with the strip and removes a boiling
film formed by the cooling fluid.
2. The cooling system of claim 1, wherein the boiling film removal
part has a shape of a roller.
3. The cooling system of claim 2, wherein the boiling film removal
part includes a brush, disposed on an external circumferential
surface of the roller, and the brush is partially brought into
contact with the strip to remove the boiling film.
4. The cooling system of claim 1, wherein the boiling film removal
part is disposed in a position where a nuclear boiling and a film
boiling are mixed together along a widthwise direction of the
strip.
5. The cooling system of claim 3, wherein the brush of the boiling
film removal part is formed of an acrylic material.
6. The cooling system of claim 1, wherein the cooling part includes
a flow control cooling device disposed on a back end of the boiling
film removal part and configured to control a flow rate based on a
temperature deviation in the widthwise direction of the strip.
7. The cooling system of claim 6, further comprising: a temperature
measurement part disposed on at least one of a front end and a back
end of the cooling part to measure a temperature of the strip; and
a control part configured to control the flow control cooling
device based on the temperature measured by the temperature
measurement part.
8. The cooling system of claim 6, further comprising: a flatness
measurement part disposed on at least one of a front end and a back
end of the cooling part to apply tension to the strip and to
measure flatness of the strip; and a control part configured to
control the flow control cooling device based on the flatness
measured by the flatness measurement part.
9. The cooling system of claim 1, wherein the cooling part includes
a cooling tank in which a cooling fluid is contained, and the
boiling film removal part is disposed inside of the cooling
fluid.
10. The cooling system of claim 9, wherein the boiling film removal
part is disposed in a location adjacent to a liquid surface of the
cooling fluid in the cooling fluid.
11. A cooling system comprising: a measurement part measuring a
temperature deviation in a widthwise direction of a strip and
flatness of the strip; and a flow control cooling device
controlling a flow rate based on the temperature deviation or the
flatness, measured by the measurement part, and injecting a cooling
fluid to the strip.
12. The cooling system of claim 11, wherein the measurement part is
disposed on both a front end and a back end of the flow control
cooling device.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to a cooling system of a
strip.
BACKGROUND ART
[0002] FIG. 1 illustrates a hot rolling process according to the
related art.
[0003] As illustrated in FIG. 1, a slab 110, a rolled material, is
heated in a heating furnace 120 to a temperature appropriate for
rolling, for example, 1100 to 1200 degrees Celsius. The hated slab
110 is rolled through a roughing mill 130 and a finishing mill 140
to be a strip 150 having a desired thickness.
[0004] The strip is cooled to a predetermined temperature, while
passing through a run-out table 160, to have required mechanical
properties. The cooled strip is produced as a product in the form
of a hot-rolled coil 150' by a rewinder (a downcoiler) 170, and a
hot rolling process is completed.
[0005] For example, the hot-rolled slab 110, heated in the heating
furnace 120, is changed in thickness and width by roughing rolling
and finishing rolling. After being cooled on the run-out table 160,
the hot-rolled slab 110 is manufactured in a coil form 150'.
[0006] Most quality of a hot-rolled steel sheet is determined
during hot rolling. In the case of the related art, a run-out table
injects cools a steel sheet by injecting cooling water onto the
steel sheet as uniformly as possible through cooling nozzles
mounted above and below the steel sheet.
[0007] However, in a cooling method using cooling water, an edge of
a steel sheet in a widthwise direction is generally cooled first.
Therefore, a great temperature deviation occurs in the widthwise
direction to cause poor flatness of the steel sheet.
[0008] Additionally, in the case of a related art, a boiling film
is formed due to vapor at the same time as a cooling phenomenon
when a hot-rolled steel sheet is cooled using cooling water. In the
case in which film boiling and nuclear boiling are mixed, a
temperature deviation occurs in a cooling process to degrade
quality of the hot-rolled steel sheet.
DISCLOSURE
Technical Problem
[0009] An aspect of the present disclosure is to provide a cooling
system which may significantly reduce temperature deviations of a
steel sheet.
[0010] An aspect of the present disclosure is to provide a cooling
system which may uniformly maintain flatness of a steel sheet.
Technical Solution
[0011] According to an aspect of the present disclosure, a cooling
system includes a cooling part, supplying a cooling fluid to a
strip, and a boiling film removal part physically coming into
contact with the strip and removing a boiling film formed by the
cooling fluid.
[0012] The boiling film removal part may have a shape of a
roller.
[0013] The boiling film removal part may include a brush, disposed
on an external circumferential surface of the roller, and the brush
may be partially brought into contact with the strip to remove the
boiling film.
[0014] The boiling film removal part may be disposed in a position
in which nuclear boiling and film boiling are mixed together in a
widthwise direction of the strip.
[0015] The brush of the boiling film removal part may be formed of
an acrylic material.
[0016] The cooling part may include a flow control cooling device
disposed on a back end of the boiling film removal part and
configured to control a flow rate based on a temperature deviation
in the widthwise direction of the strip.
[0017] The cooling system may further include a temperature
measurement part, disposed on at least one of a front end and a
back end of the cooling part to measure a temperature of the strip,
and a control part configured to control the flow control cooling
device based on the temperature measured by the temperature
measurement part.
[0018] The cooling system may further include a flatness
measurement part, disposed on at least one of a front end and a
back end of the cooling part to apply tension to the strip and to
measure flatness of the strip, and a control part configured to
control the flow control cooling device based on the flatness
measured by the flatness measurement part.
[0019] The cooling part may include a cooling tank, in which a
cooling fluid is contained, and the boiling film removal part may
be disposed inside of the cooling fluid.
[0020] The boiling film removal part may be disposed in a location
adjacent to a liquid surface of the cooling fluid in the cooling
fluid.
[0021] According to an aspect of the present disclosure, a cooling
system includes a measurement part, measuring a temperature
deviation in a widthwise direction of a strip and flatness of the
strip, and a flow control cooling device controlling a flow rate
based on the temperature deviation or the flatness, measured by the
measurement part, and injecting a cooling fluid onto the strip.
[0022] The measurement part may be disposed on both a front end and
a back end of the flow control cooling device.
Advantageous Effects
[0023] As set forth above, a cooling system according to an example
embodiment of the present disclosure cools a boiling film, formed
on a strip, using a boiling film removal part. Flatness and
temperature deviation of the strip are detected on an input side
and an output side through a flatness measurement part and a
temperature measurement part, respectively. Based on the flatness
and the temperature deviation, an elongated portion or a
high-temperature portion is selectively cooled using a cooling
device which may adjust a flow distribution in a widthwise
direction. As a result, the flatness of the strip may be
improved.
DESCRIPTION OF DRAWINGS
[0024] FIG. 1 illustrates of a hot rolling process according to a
related art.
[0025] FIG. 2 is a schematic diagram of a cooling system according
to an example embodiment of the present disclosure.
[0026] FIG. 3 illustrates a flow control cooling device in FIG.
2.
[0027] FIG. 4 illustrates the flow control cooling device in FIG.
2.
[0028] FIG. 5 illustrates a position in which a boiling film
removal part is disposed on a strip.
[0029] FIG. 6 is a schematic diagram of a cooling system according
to another example embodiment of the present disclosure.
[0030] FIG. 7 is a perspective view of a flow control cooling
device in FIG. 6.
BEST MODE FOR INVENTION
[0031] Before describing the present disclosure in detail, it will
be appreciated that terms or words used in the specification and
claims should not be limited and construed as having common or
dictionary meanings, and should be construed as having meanings and
concepts according to the technical spirit of the present
disclosure, based on the principle that the inventor can
appropriately define the concept of each term for describing the
present disclosure in the best manner. The example embodiment
described in the present disclosure and the configuration
illustrated in the drawings are merely the most preferred
embodiment of the present disclosure, rather than representing all
the technical concepts of the present disclosure, so the present
disclosure is meant to cover all modifications, similarities and
alternatives included in the spirit and scope of the present
disclosure at the time of the filing of the present disclosure.
[0032] Hereinafter, example embodiments of the present disclosure
will be described in detail with reference to the accompanying
drawings. In each drawing, like reference numerals refer to like
elements. Also, detailed descriptions of known functions and
elements which unnecessarily obscure the important points of the
descriptions will be omitted. Also, for the same reasons, in the
drawings, some elements may be exaggerated, omitted, or
schematically illustrated, and the size of each element does not
entirely reflect an actual size.
[0033] Referring to FIG. 2, a cooling system 10 according to an
example embodiment is configured to cool a rolled strip S and
includes a cooling part 20, a temperature measurement part 30, a
flatness measurement part 40, and a boiling film removal part 50.
In this embodiment, the strip S includes a hot-rolled steel sheet,
a high-temperature material.
[0034] The cooling part 20 injects cooling water to the strip S,
conveyed from a finishing mill, to cool the strip S.
[0035] In this embodiment, the cooling part 20 includes a first
cooling device 21, a second cooling device 22, and a flow control
cooling device 23.
[0036] The first cooling device 21 is disposed on an input side of
a cooling section, and the second cooling device 22 is disposed on
an output side of the cooling section. The flow control cooling
device 23 is disposed between the first cooling device 21 and the
second cooling device 22.
[0037] The first cooling device 21 may include upper cooling
devices 21a and 22a configured to inject a cooling fluid
(hereinafter referred to as "cooling water") onto a top surface of
the strip S. The second cooling device 22 may include lower cooling
devices 21b and 22b configured to inject cooling water onto a
bottom surface of the strip S. In this embodiment, the flow control
cooling device 23 is disposed to inject cooling water onto only the
top surface of the strip S. However, the configuration of the
present disclosure is not limited thereto and, as necessary, the
flow control cooling device 23 may be configured to inject cooling
water onto both top and bottom surfaces of the strip S.
[0038] The first cooling device 21 and the second cooling device 22
inject cooling water onto the entirety of the strip S. Thus, a
cooling header according to a related art may be used as the first
and second cooling devices 21 and 22.
[0039] On the other hand, the flow control cooling device 23
injects cooling water to a portion of the strip S to correspond to
a temperature deviation of the strip S. Thus, a cooling header,
capable of selectively driving a cooling nozzle configured to
inject cooling water, may be used as the flow control cooling
device 23.
[0040] FIG. 3 illustrates a flow control cooling device in FIG.
2.
[0041] Referring to FIG. 3, the flow control cooling device 23 may
control a flow rate of cooling water injected in a widthwise
direction of the strip S. Accordingly, the flow control 23 may
inject a large amount of cooling water to a high-temperature
portion of the strip S, and may inject a small amount of cooling
water onto a low-temperature portion of the strip S or may stop
injecting the cooling water.
[0042] Flow rate control may be performed by controlling nozzles
24a and 24b provided on a cooling header. The nozzles 24a and 24b
may be disposed to have at least one row and at least column in the
widthwise direction of the strip S. After a plurality of nozzles
24a and 24b are divided into a plurality of groups, nozzles 24a and
24b of each group may be opened and closed to inject a cooling
fluid to a predetermined region.
[0043] In this case, a control part 70 may open at least one of the
groups to selectively inject a cooling fluid 26 to a specific
region. However, the configuration of the present disclosure is not
limited thereto.
[0044] FIG. 3 illustrates a case in which cooling water is injected
through only the specific nozzles 24a, among all nozzles 24a and
24b, and is not injected through the other nozzles 24b. In
addition, FIG. 3 illustrates an operating example of the flow
control cooling device 23 when temperature of a central portion of
the strip S is high and temperature is decreased toward an edge of
the strip S.
[0045] The temperature measurement part 30 may include a
thermometer or a temperature sensor. The temperature measurement
part 30 is disposed at an input side and an output side of a
cooling section. For example, the temperature measurement part 30
may be disposed on at least one of a front end and a back end.
[0046] In this embodiment, the temperature measurement part 30
measures a temperature of the strip S at both a starting point and
an ending point of the cooling section. However, the disposition of
the temperature measurement part 30 is not limited thereto and, as
necessary, the temperature measurement part 30 may be disposed on
only the back end of the cooling part 20.
[0047] The temperature measurement part 30 is disposed in the
widthwise direction of the strip S to measure a temperature of the
strip S in the widthwise direction. Thus, a temperature deviation,
depending on the widthwise direction of the strip S, may be
continuously measured.
[0048] The flatness measurement part 40 includes a contact flatness
meter brought into contact with the strop S to measure flatness of
the strip S.
[0049] The flatness measurement part 40 is disposed below the strip
S and is brought into contact with a bottom surface of the strip S
to elevate the strip S in an upward direction by a certain
distance.
[0050] Accordingly, the strip S maybe brought into contact with the
flatness measurement part 40 while tension is applied to the
flatness measurement part 40. As a result, the flatness measurement
part 40 may more precisely measure the flatness of the strip S.
[0051] In this embodiment, similarly to the temperature measurement
part 30, the flatness measurement part 40 may be disposed on the
input side and the output side of the cooling section. For example,
the flatness measurement part 40 may be disposed on at least one of
the front end and the back end of the cooling part 20. More
specifically, the flatness measurement part 40 may be disposed
between the temperature measurement part 30 and the cooling part
20.
[0052] Thus, the temperature and the flatness of the strip S are
measured while the strip continuously passes through the
temperature measurement part 30 and the flatness measurement part
40. However, the disposition of the flatness measurement part 40 is
not limited thereto, and the flatness measurement part 40 may be
disposed on only the back end of the cooling part 20.
[0053] The control part 70 is connected to the temperature
measurement part 30 and the flatness measurement part 40 to receive
temperature data from the temperature measurement part 30 and to
receive flatness data from the flatness measurement part 40. The
control part 70 controls a cooling header of the cooling part 20
based on the receive data to control an injection location, a flow
rate, and the like of cooling water injected in the widthwise
direction of the strip S.
[0054] Similarly to this embodiment, when the temperature
measurement part 30 and the flatness measurement part 40 are
mounted on the respective input and output sides of the cooling
section, the control part 70 may control the flow control cooling
device 23 by combining temperature distribution and flatness
information of the strip S, entering the cooling section, with
temperature distribution and flatness information of the strip S
discharged from the cooling section.
[0055] For example, the control part 70 may continuously compare a
state of the strip S, entering the cooling section, with a state of
the strip S discharged from the cooling section, and may derive an
optimal flow rate injection condition to correspond to various
states of the strip S when the strip S enters the cooling
section.
[0056] The boiling film removal part 50 is disposed between the
first cooling device 21 and the flow control cooling device 23.
[0057] FIG. 4 illustrates the flow control cooling device in FIG.
2, and FIG. 5 illustrates a position in which a boiling film
removal part is disposed on a strip.
[0058] Referring to FIG. 4, the boiling film removal part 50 is in
the form of a roller having an external circumferential surface on
which a brush 52 is disposed. For example, the brush 52 is formed
to have a shape in which a plurality of brushes are densely
arranged. For example, the brush 52 may be formed of an acrylic
material. However, a material of the brush 52 is not limited
thereto, and various materials may be used as the material of the
brush 52 as long as they are not easily deformed at high
temperature and do not deform the strip S even in contact with the
strip S.
[0059] An external surface of the boiling film removal part 50 is
not limited to a shape of the brush 52. The external surface of the
boiling film removal part 50 may have various shapes as along as a
material of the boiling film removal part 50 may be brought into
contact with the strip S to remove a boiling film on the strip S,
for example, an external circumferential surface is in the form of
foam or several sheets of mesh are wound on a roller.
[0060] When a cooling fluid 26 is injected to the strip S by the
first cooling device 21, the strip S is cooled first. Thus, a
boiling film such as film boiling, nuclear boiling or the like may
be formed on a top surface of the strip S.
[0061] When temperature of the strip S reaches temperature at which
film boiling and nuclear boiling are formed together (for example,
300 to 500 degrees Celsius), film boiling B1 and nuclear boiling B2
are irregularly mixed on the strip S, as illustrated in FIG. 5.
[0062] Since cooling speed of a portion, in which the film boiling
B1 is formed, is different from cooling speed of a portion in which
the nuclear boiling B2 is formed, a difference in cooling speed of
the strip S occurs when the film boiling B1 and the nuclear boiling
B2 are mixed. Accordingly, a cooling deviation occurs during a
cooling process to have an effect on flatness of the strip S.
[0063] To address the above issue, the cooling device according to
this embodiment includes the boiling film removal part 50.
[0064] The boiling film removal part 50 is brought into physical
contact with the strip S, on which a boiling film is formed, while
rotating and removing a boiling film in a manner of brushing off a
boiling film formed on a top surface of the strip S.
[0065] The boiling film removal part 50 may be disposed in a
location where the boiling film transitions from the film boiling
B1 to the nuclear boiling B2 on the strip S.
[0066] Accordingly, the boiling film removal part 50 may remove a
boiling film of a portion in which the film boiling B1 and nuclear
boiling B2 are mixed. As a result, a temperature deviation, caused
by the film boiling B1 and the nuclear boiling B2 in a widthwise
direction of the strip S, may be significantly reduced.
[0067] The above-described flow control cooling device 23 is
disposed on a back end of the boiling film removal part 50. Thus,
the flow control cooling device 23 injects the cooling fluid 26 on
the strip S on which the boiling film is significantly reduced, and
injects a large amount of cooling water to a high-temperature
portion and injects a small amount of cooling water to a
low-temperature portion to correspond to a temperature
deviation.
[0068] As a result, a cooling effect may be significantly improved
and a temperature deviation in the widthwise direction of the strip
S may be efficiently reduced.
[0069] A case, in which the cooling system 10 includes both the
temperature measurement part 30 and the flatness measurement part
40, has been described in this embodiment. However, the
configuration of the cooling system 10 is not limited thereto, and
the cooling system 10 may be configured to include only one of the
temperature measurement part 30 and the flatness measurement part
40.
[0070] The above-configured cooling system 10 removes a boiling
film, formed on the strip S, using the boiling film removal part 50
and cools the strip S. In addition, the cooling system 10 detects
flatness and temperature deviation of the strip S on an input side
and an output side through the flatness measurement part 40 and the
temperature measurement part 30 and selectively cools an elongated
portion or a high-temperature portion, based on the flatness and
the temperature deviation, using a cooling device which may adjust
a flow distribution in a widthwise direction.
[0071] Accordingly, a strip S, having an entirely uniform
temperature distribution and improved flatness, may be
manufactured.
[0072] A cooling system according to the present disclosure is not
limited to the above-described embodiment, and may be variously
modified.
[0073] FIG. 6 is a schematic diagram of a cooling system according
to another example embodiment of the present disclosure, and FIG. 7
is a perspective view of a flow control cooling device in FIG.
6.
[0074] Referring to FIGS. 6 and 7, a cooling system 10a is
configured to cool a strip S while vertically moving the strip S
and is disposed in such a manner that the strip s passes through a
cooling tank 25 in which a cooling liquid 26 is contained.
[0075] To this end, similarly to the above-described embodiment,
the cooling system 10a includes a cooling part 20, a temperature
measurement part 30, a flatness measurement part 40, a boiling film
removal part 50, and a cooling tank 25. The temperature measurement
part 30, the flatness measurement part 40, and the boiling film
removal part 50 are disposed, similarly to the above-described
embodiment, on the basis of a moving direction of a strip S to
perform the same functions as those in the above-described
embodiment. Therefore, detailed descriptions of the above
components will be omitted and only differences thereof will be
described in detail. In this embodiment, the strip S may include a
cold-rolled steel sheet.
[0076] The cooling part 20 includes a cooling tank 25 in which a
cooling fluid 26 is contained. The strip S is vertically moved, and
is introduced into the cooling tank 25 and is drawn out of the
cooling tank 25 after being moved by a predetermined distance.
Accordingly, inside of the cooling tank 25 is provided with a
plurality of guide rolls 27 supporting and guiding the strip S to
achieve smooth movement of the strip S.
[0077] As necessary, the cooling part 20 may further include a
cooling device, not illustrated, configured to inject the cooling
fluid 26 to the strip S. The cooling device may be disposed inside
or outside of the cooling fluid 26. The cooling device may have a
configuration similar to the configuration of each of the first and
second cooling devices according to the above-described embodiment,
and detailed description thereof will be omitted.
[0078] In this embodiment, the boiling film removal part 50 may be
disposed inside the cooling tank 25.
[0079] When the strip enters inside of the cooling fluid 26 of the
cooling tank 25, film boiling and nuclear boiling may be apt to be
mixed on a surface of the strip S. Therefore, in this embodiment,
the boiling film removal part 50 may be disposed inside of the
cooling fluid 26 and disposed in a location adjacent to a liquid
surface of the cooling liquid 26. More specifically, similarly to
the above-described embodiment, the boiling film removal part 50 is
disposed in a location where a boiling film transitions from film
boiling to nuclear boiling on the strip S.
[0080] Similarly to the above-described embodiment, the boiling
film removal part 50 may remove a boiling film of a portion, in
which film boiling and nuclear boiling are mixed, to significantly
reduce a temperature deviation caused by the film boiling and
nuclear boiling in a widthwise direction of the strip S.
[0081] In this embodiment, the boiling film removal part 50 is
disposed on both surfaces of the strip S. However, a configuration
of the boiling film removal part 50 is not limited thereto.
[0082] A flow control cooling device 23 is disposed on a back end
of the boiling film removal part 50 and partially injects cooling
water or cooling gas to the strip S according to control of a
control part 70.
[0083] In this embodiment, the flow control cooling device 23,
disposed on both surfaces of the strip S to simultaneously inject
cooling water onto both surfaces of the strip S, is illustrated.
However, a disposition of the flow control cooling device 23 is not
limited thereto and, similarly to the above-described embodiment,
the flow control cooling device 23 may be disposed on only one
surface of the strip S.
[0084] A case, in which a cooling device is used to cool a
hot-rolled steel sheet and a cold-rolled steel sheet, has been
described in the above embodiments. However, as necessary, the
cooling device may be used to cool various materials such as an
electrical steel sheet, a stainless steel (STS), a thick steel
sheet, and the like.
[0085] While embodiments have been shown and described above, it
will be apparent to those skilled in the art that modifications and
variations could be made without departing from the scope of the
present disclosure as defined by the appended claims.
* * * * *