CN113652533B - Slab heating control method and device - Google Patents
Slab heating control method and device Download PDFInfo
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- CN113652533B CN113652533B CN202110815717.1A CN202110815717A CN113652533B CN 113652533 B CN113652533 B CN 113652533B CN 202110815717 A CN202110815717 A CN 202110815717A CN 113652533 B CN113652533 B CN 113652533B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 224
- 238000000034 method Methods 0.000 title claims abstract description 30
- 101100348084 Drosophila melanogaster CDase gene Proteins 0.000 claims abstract description 233
- 238000004519 manufacturing process Methods 0.000 claims abstract description 44
- 238000005098 hot rolling Methods 0.000 claims abstract description 27
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003546 flue gas Substances 0.000 claims abstract description 11
- 238000010079 rubber tapping Methods 0.000 claims description 50
- 229910000831 Steel Inorganic materials 0.000 claims description 36
- 239000010959 steel Substances 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000004590 computer program Methods 0.000 claims description 16
- 238000003860 storage Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 7
- 239000002699 waste material Substances 0.000 description 7
- 238000002791 soaking Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
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- 230000005484 gravity Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
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- 239000002918 waste heat Substances 0.000 description 1
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- 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
- C21D11/00—Process control or regulation for heat treatments
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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Abstract
The invention relates to the technical field of hot rolling, in particular to a slab heating control method and device. The method comprises the following steps: in the first roller period, controlling a heating furnace to heat the first slab sequence; controlling a second slab sequence to enter an inlet of the heating furnace at the beginning of a second roll period; wherein the thickness of the second slab in the second slab sequence is less than the thickness of the first slab in the first slab sequence; when the distance from the tail end of the first slab sequence to the inlet of the heating furnace exceeds the idle length, controlling the heating furnace to heat in a second roller period; and sequentially closing burners of a heating section corresponding to the forefront position of the first slab sequence in the heating furnace, and heating the second slab sequence by utilizing the residual heat of the flue gas in the heating furnace. The invention realizes the mixed heating of the thin slab and the thick slab in the same heating furnace, and reduces the heating furnaces required in the hot rolling process, thereby reducing the production cost of the hot rolling process.
Description
Technical Field
The invention relates to the technical field of hot rolling, in particular to a slab heating control method and device.
Background
When the steel rabbet is used for producing strip steel, the heating operation of each heating section of the heating furnace is controlled according to the thickness of the plate blank, so that the tapping temperature of the plate blank is within a target temperature range. If the tapping temperature is too high, the energy consumption and the production cost of the heating furnace are increased, and the slab can be deformed in the furnace, and even the condition that the slab cannot be discharged out of the furnace occurs; if the tapping temperature is too low, damage to roller equipment can be caused, and the subsequent steel rolling process is affected. Therefore, when steel rabbets are used for producing strip steel with different thickness specifications, a plurality of hot rolling production lines are generally adopted to heat slabs with different thickness specifications respectively.
Therefore, how to reduce the production cost of the hot rolling process is a technical problem to be solved at present.
Disclosure of Invention
The invention aims to provide a slab heating control method and a slab heating control device, so as to reduce the production cost of a hot rolling process.
The embodiment of the invention provides the following scheme:
in a first aspect, an embodiment of the present invention provides a method for controlling heating of a slab, the method including:
in the first roller period, controlling a heating furnace to heat the first slab sequence;
controlling a second slab sequence to enter an inlet of the heating furnace at the beginning of the second roll period; the thickness of the second plate blank in the second plate blank sequence is smaller than that of the first plate blank in the first plate blank sequence; when the distance from the tail end of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, controlling the heating furnace to heat in a second roller period;
and sequentially closing burners of a heating section corresponding to the tail position of the first slab sequence in the heating furnace, and heating the second slab sequence by utilizing the residual heat of the flue gas in the heating furnace.
In one possible embodiment, before the controlling the heating furnace heats the first slab sequence, the method further includes:
determining the production speed of the heating furnace according to the preset hot rolling production speed;
and determining the steel loading interval of the first slab sequence and the steel loading interval of the second slab sequence according to the production speed of the heating furnace.
In one possible embodiment, the first slab has a thickness of 200mm to 240 mm; the second slab has a thickness of 100 mm to 160 mm.
In one possible embodiment, before the controlling the heating furnace heats the first slab sequence, the method further includes:
determining the length of the air step according to the tapping temperature of the first slab sequence;
if the highest tapping temperature in the set number of first slabs at the tail part of the first slab sequence is not more than 1160 ℃, the length of the air step is 1.5 m to 2.5 m; if the highest tapping temperature is between 1160 ℃ and 1180 ℃, the length of the air step is 3.5 meters to 4.5 meters; if the highest tapping temperature is between 1180 ℃ and 1200 ℃, the length of the air step is 5 meters to 6 meters; and if the highest tapping temperature is between 1200 ℃ and 1220 ℃, the length of the air step is 7 meters to 8 meters.
In a possible embodiment, the steel loading interval of the second slab sequence is in the range of 200mm to 300mm, so as to control the furnace time of the second slab in the heating furnace to be between 70 minutes and 150 minutes.
In one possible embodiment, the first slab has a cantilever length of no more than 0.8 meters on the water beam in the furnace, and the second slab has a cantilever length of no more than 0.8 meters on the water beam in the furnace.
In a second aspect, embodiments of the present invention provide a slab heating control apparatus, the apparatus including:
the first control module is used for controlling the heating furnace to heat the first slab sequence in the first roller period;
the second control module is used for controlling a second slab sequence to enter an inlet of the heating furnace when the second roller period starts; the thickness of the second plate blank in the second plate blank sequence is smaller than that of the first plate blank in the first plate blank sequence; when the distance from the tail end of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, controlling the heating furnace to heat in a second roller period;
and the third control module is used for sequentially closing the burners of the heating sections corresponding to the tail positions of the first slab sequences in the heating furnace and heating the second slab sequences by utilizing the residual heat of the flue gas in the heating furnace.
In one possible embodiment, the apparatus further comprises:
the first determining module is used for determining the production speed of the heating furnace according to the preset hot rolling production speed before the heating furnace is controlled to heat the first slab sequence;
and the second determining module is used for determining the steel loading interval of the first slab sequence and the steel loading interval of the second slab sequence according to the production speed of the heating furnace.
In one possible embodiment, the first slab has a thickness of 200mm to 240 mm; the second slab has a thickness of 100 mm to 160 mm.
In one possible embodiment, the apparatus further comprises:
the third determining module is used for determining the idle step length according to the tapping temperature of the first slab sequence before the heating furnace is controlled to heat the first slab sequence;
if the highest tapping temperature in the set number of first slabs at the tail part of the first slab sequence is not more than 1160 ℃, the length of the air step is 1.5 m to 2.5 m; if the highest tapping temperature is between 1160 ℃ and 1180 ℃, the length of the air step is 3.5 meters to 4.5 meters; if the highest tapping temperature is between 1180 ℃ and 1200 ℃, the length of the air step is 5 meters to 6 meters; and if the highest tapping temperature is between 1200 ℃ and 1220 ℃, the length of the air step is 7 meters to 8 meters.
In a possible embodiment, the steel loading interval of the second slab sequence is in the range of 200mm to 300mm, so as to control the furnace time of the second slab in the heating furnace to be between 70 minutes and 150 minutes.
In one possible embodiment, the first slab has a cantilever length of no more than 0.8 meters on the water beam in the furnace, and the second slab has a cantilever length of no more than 0.8 meters on the water beam in the furnace.
In a third aspect, an embodiment of the present invention provides a slab heating control apparatus, including:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the slab heating control method described in the first aspect.
In a fourth aspect, embodiments of the present invention provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the slab heating control method described in the first aspect.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, a heating furnace is controlled to heat a thicker first slab sequence in a conventional manner in a first roller period, then when the distance from the tail end of the first slab sequence to the inlet of the heating furnace exceeds the idle length, a thinner second slab sequence is heated, and simultaneously, along with the movement of the second slab sequence in the heating furnace, burners of a heating section corresponding to the foremost end position of the first slab sequence in the heating furnace are sequentially closed, and the second slab sequence is heated by utilizing the residual temperature of flue gas in the heating furnace, so that the mixed heating of a thin slab and a thick slab in the same heating furnace is realized, and the heating furnace required in a hot rolling process is reduced, thereby reducing the production cost of the hot rolling process.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present description, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for controlling heating of a slab according to an embodiment of the present invention;
FIG. 2 is a schematic view of a heating furnace according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a slab heating control device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the embodiments of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a slab heating control method according to an embodiment of the present invention, and specifically includes steps 11 to 13.
And 11, during the first roller period, controlling a heating furnace to heat the first slab sequence.
Specifically, fig. 2 is a schematic structural diagram of a heating furnace according to an embodiment of the present invention. The heating furnace is divided into four heating sections: the device comprises a preheating section, a first heating section, a second heating section and a soaking section. Each heating section is provided with a burner which is used for providing energy required by heating for each heating section. When the heating furnace works, the plate blank is placed on the water beam, and the plate blank is heated through each heating section in the heating furnace under the drive of the water beam. In a general heating furnace, the length of the heat recovery section is 6.5 to 23 meters, and the length of the preheating section is 5.5 to 9 meters; the length of the first heating section is 9-11 m, the length of the second heating section is 8.5-10 m, and the length of the soaking section is 8-10 m.
Specifically, the first rolling period is opposite to the second rolling period, and in general, one rolling period corresponds to the production of the strip steel with the same specification, and the heat treatment of the slab with the same specification is required.
Specifically, the first slab sequence refers to a slab sequence formed by sequentially arranging one or more first slabs along the heating path direction in the heating furnace. In order to reduce the influence of gravity on the deformation of the first slab, in this embodiment, the difference between the length of the first slab and the furthest distance between the water Liang Touwei is not greater than 1.6 meters, so that when the first slab is placed on the water beam, the lengths of the head and tail suspended water beams of the first slab are less than 0.8 meters. Here, the length of the first slab means its length in the direction of the heating path in the heating furnace.
And step 12, controlling a second slab sequence to enter the inlet of the heating furnace at the beginning of the second roller period.
The thickness of the second plate blank in the second plate blank sequence is smaller than that of the first plate blank in the first plate blank sequence; and when the distance from the tail end of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, controlling the heating furnace to heat for a second roller period.
Specifically, the thickness of the second slab is smaller than that of the first slab, namely: the second slab is a thin slab and the first slab is a thick slab. Therefore, the tapping temperature of the first slab is greater than the tapping temperature of the second slab, and the heating temperature of the first slab in the heating furnace is also greater than the heating temperature of the second slab.
If the temperature in the heating furnace is not controlled, the second slab is directly heated, and deformation of the second slab is easily caused. While there is some hysteresis in the temperature regulation in the furnace, for this purpose this embodiment desirably reduces the effect of the heat in the furnace to heat the first slab on the second slab by pulling the distance between the first and second slab sequences.
In particular, the second slab sequence should be kept at least a distance of a space length from the end of the first slab sequence when entering the inlet of the heating furnace, so as to achieve heating control of the second slab sequence.
Here, the inlet of the heating furnace means the inlet of the first heating section (preheating section) in the heating furnace. In order to reduce the influence of gravity on the deformation of the second slab, the difference between the length of the second slab and the furthest distance between the water Liang Touwei in this embodiment is not greater than 1.6 meters, so that when the second slab is placed on the water beam, the lengths of the head and tail suspended water beams of the second slab are less than 0.8 meters. Here, the length of the second slab means its length in the direction of the heating path in the heating furnace.
And 13, sequentially closing burners of a heating section corresponding to the tail position of the first slab sequence in the heating furnace, and heating the second slab sequence by utilizing the residual temperature of the flue gas in the heating furnace.
Specifically, as the second slab sequence advances in the heating furnace, when the foremost position of the second slab sequence reaches the preheating section, all burners in the preheating section are turned off in the embodiment; when the last position of the first slab sequence reaches the first heating section, all burners in the first heating section are closed in the embodiment; when the final position of the first slab sequence reaches the second heating section, all burners in the second heating section are closed in the embodiment; when the last position of the first slab sequence reaches the soaking section, all burners in the soaking section are closed in the embodiment; because the foremost end of the second slab sequence is a certain length away from the tail end of the first slab sequence, the embodiment can utilize the residual heat of flue gas in the heating furnace to heat the second slab sequence, on the premise of ensuring the tapping temperature of the second slab, the influence of the heating of the first slab on the second slab is reduced, the heating temperature of the first slab is utilized to the maximum efficiency, the mixed heating of the thin slab and the thick slab in the same heating furnace is realized, and the heating furnace required in the hot rolling process is reduced, so that the production cost of the hot rolling process is reduced.
Specifically, if the tapping temperature of the second slab in any heating section is smaller than the lower limit value of the temperature of the corresponding heating section, restarting the burner in the corresponding heating section, and improving the heating temperature of the corresponding heating section; if the tapping temperature of the second slab in any heating section is greater than the upper limit value of the temperature of the corresponding heating section, introducing air into the corresponding heating section, and reducing the heating temperature in the heating section; if the second slab cannot be discharged due to the failure of the rolling mill, the temperature of the second slab needs to be immediately reduced to below 1000 ℃ to prevent the slab from deforming.
Since the slab having a small thickness variation has a small difference in tapping temperature, the heating temperature of the thicker slab does not cause the heating deformation of the thinner slab, and the present embodiment is suitable for the continuous hybrid heating process of the slab having a large thickness variation (but this does not mean that the present embodiment is not suitable for the continuous hybrid heating process of the slab having a small thickness variation), the thickness specifications of the first slab and the second slab are provided herein.
In this embodiment, the thickness of the first slab is 200mm to 240mm, and the thickness of the second slab is 100 mm to 160 mm. The tapping temperature of the first slab of this gauge is generally above 1250 degrees celsius and the tapping temperature of the second slab of this gauge is generally around 1100 degrees celsius.
Specifically, the tapping temperature of the second plate blank at the outlet of the heating furnace can be 1100 ℃ +/-20 ℃, the end temperature of the second heating section is 950+/-50 ℃, and the end temperature of the first heating section is 800+/-100 ℃, so that the stable heating quality of the second plate blank can be ensured, the strength of the second plate blank in the furnace can be ensured, and the deformation can be prevented.
In the heating furnace shown in fig. 2, the temperature of the preheating section is controlled to be in the range of 800 ℃ to 1000 ℃, the temperature of one heating section is controlled to be in the range of 900 ℃ to 1100 ℃, the temperature of the second heating section is controlled to be in the range of 1000 ℃ to 1280 ℃, and the temperature of the soaking section is controlled to be in the range of 1100 ℃ to 1250 ℃.
Here, the embodiment also provides a solution of the steel loading intervals of the first slab sequence and the second slab sequence, which specifically includes steps 21 to 22.
And step 21, determining the production speed of the heating furnace according to the preset hot rolling production speed.
In actual production, a plurality of heating furnaces are generally adopted to heat the slab in parallel, and the slab is tapped together on the same hot rolling production line, so that the production speed of the hot rolling production line determines the production speed of each heating furnace, and the production speed of the hot rolling production line is higher, and the production speed of the heating furnaces is higher.
And step 22, determining the steel loading interval of the first slab sequence and the steel loading interval of the second slab sequence according to the production speed of the heating furnace.
Specifically, after knowing the production speed of the heating furnace, the steel loading interval of the first slab sequence and the steel loading interval of the second slab sequence can be determined by combining the furnace time of the first slab and the second slab.
Here, the process of determining the steel loading pitch of the second slab sequence in this embodiment will be described by taking the example of parallel heating in 4 heating furnaces.
In the prior art, the production speed can be expressed by tapping speed, and under the condition that the tapping speed of a hot rolling production line is constant, the more the number of heating furnaces are opened, the smaller the tapping speed of each heating furnace is, and the furnace time of a slab in each heating furnace is correspondingly prolonged.
In order to control the heating time of the thinner second plate blank, the last 40-60 plate blanks of the first plate blank sequence begin to select two heating furnaces for steel filling, the third and fourth heating furnaces are not filled with steel, the steel filling interval is controlled to be 200-300 mm, the second plate blank is controlled to be in the range of 70-150 min by controlling the production rhythm, the tapping temperature of the second plate blank is further ensured, and the overheating condition of the second plate blank is reduced.
In this embodiment, the distance from the end of the first slab sequence to the forefront end of the second slab sequence directly affects the temperature in the furnace of the second slab sequence, which is important for heating the second slab, and the embodiment also provides a fast obtaining scheme of the air-step length, which specifically includes step 31.
And step 31, determining the idle step length according to the tapping temperature of the first slab sequence.
Specifically, in the same heat, the embodiment establishes the length of the empty step between the second slab sequence and the last slab in the last roll period by using the highest tapping temperature in the 15 first slabs at the end of the first roll period.
If the highest tapping temperature in the 15 first slabs at the tail of the first roller period is not more than 1160 ℃, the length of the air step is 1.5 m to 2.5 m; if the highest tapping temperature is between 1160 ℃ and 1180 ℃, the length of the air step is 3.5 meters to 4.5 meters; if the highest tapping temperature is between 1180 ℃ and 1200 ℃, the length of the air step is 5 meters to 6 meters; if the highest tapping temperature is between 1200 ℃ and 1220 ℃, the length of the air step is 7 meters to 8 meters.
Therefore, in practical application, the maximum tapping temperature in the first slab with the set number of the tail parts of the first slab sequence is only needed to be known, and the idle step length can be rapidly calculated.
Here, the implementation of the above scheme is illustrated.
After the first slab sequence was heated normally, a second slab 30 pieces with a thickness gauge of 110mm was added to the heating furnace.
And the last 50 first slabs of the first slab sequence are subjected to two-furnace steel loading, the steel loading interval is 300mm, the length specification of the second slab is 10500mm, middle positioning is adopted, and the head and tail of the slab are suspended out of the water beam by 350mm.
In the same furnace, the highest tapping temperature in the last 15 first slabs of the last roller period is 1175 ℃, so that the spacing between the forefront end of the second slab sequence and the last roller period is 4m.
After the second plate blank is put into the furnace, all the burners of the preheating section are closed; when the first plate blank leaves the first heating section, all the first burning nozzles are closed; and after the first plate blank leaves the second heating section, the secondary combustion nozzle is completely closed. And heating the subsequent thin-specification slab by means of flue gas waste heat, wherein the temperature of the second slab is monitored in the heating process, the tapping temperature is 1110 ℃, the end temperature of the second heating section is 980 ℃, the end temperature of the first heating section is 830 ℃, and the total heating time is 120min. The second plate blank has good temperature state after being discharged from the furnace, good blank shape and no deformation, and meets the rolling requirement.
Here, the embodiment also provides a practical application case of the above scheme, so as to illustrate the practical benefit obtained by the embodiment.
Application case
After accidents occur in some steel plants, a large amount of waste billets with the thickness of 110 mm-170 mm are produced. In order to improve the utilization efficiency of the waste billets, the thin billets are planned to be rolled in a centralized manner in a hot rolling production line to be auction materials, so that the waste billets are utilized secondarily. Auction materials have lower requirements on surface quality and performance, so that risks in the rolling process are lower, and difficulties are mainly concentrated in a heating link.
The thickness of the plate blank of the hot-rolled heating furnace is generally 220 mm-240 mm, and the burner power and the furnace body structure are designed according to the specification. When a thin slab with the thickness of 110-170 mm is mixed with a normal slab for heating, the hearth temperature required by the normal slab is far higher than that of the thin slab, so that the temperature of the adjacent thin slab rises fast and exceeds the required temperature range. If the thin blank is independently heated, the blank with normal specification in the furnace needs to be emptied and then is filled with steel, so that the production rhythm is greatly influenced, and the problems of energy waste, yield reduction and the like are caused.
In the production of a certain steel mill of the head steel, the scheme is applied, so that the mixed heating of the thin slab and the thick slab in the same heating furnace is realized, the heating furnace required in the hot rolling process is reduced, and the production cost of the hot rolling process is reduced. At present, the initial steel rolls a slab with the thickness of 110 mm-160 mm per month by about 1000 tons, the price of the waste slab is about 2000 yuan/ton, the price of the available materials after hot rolling is 3700 yuan/ton, the processing cost is about 220 yuan, and the income is 1776 ten thousand yuan per year. Meanwhile, the scheme can expand the specifications of the heating furnace capable of producing the plate blanks, reduce the problems of energy waste, environmental pollution and the like caused by secondary smelting of waste plate blanks, reduce carbon emission and respond to the national environmental protection requirement.
Based on the same inventive concept as the method, the embodiment of the invention also provides a slab heating control device, as shown in fig. 3, which is a schematic structural diagram of the embodiment of the device, and the device comprises:
a first control module 41 for controlling the heating furnace to heat the first slab sequence during the first roller period;
a second control module 42 for controlling a second sequence of slabs into the inlet of the furnace at the beginning of the second roll period; the thickness of the second plate blank in the second plate blank sequence is smaller than that of the first plate blank in the first plate blank sequence; when the distance from the tail end of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, controlling the heating furnace to heat in a second roller period;
and the third control module 43 is configured to sequentially turn off burners of a heating section corresponding to the end position of the first slab sequence in the heating furnace, and heat the second slab sequence by using the residual flue gas temperature in the heating furnace.
In one possible embodiment, the apparatus further comprises:
the first determining module is used for determining the production speed of the heating furnace according to the preset hot rolling production speed before the heating furnace is controlled to heat the first slab sequence;
and the second determining module is used for determining the steel loading interval of the first slab sequence and the steel loading interval of the second slab sequence according to the production speed of the heating furnace.
In one possible embodiment, the first slab has a thickness of 200mm to 240 mm; the second slab has a thickness of 100 mm to 160 mm.
In one possible embodiment, the apparatus further comprises:
the third determining module is used for determining the idle step length according to the tapping temperature of the first slab sequence before the heating furnace is controlled to heat the first slab sequence;
if the highest tapping temperature in the set number of first slabs at the tail part of the first slab sequence is not more than 1160 ℃, the length of the air step is 1.5 m to 2.5 m; if the highest tapping temperature is between 1160 ℃ and 1180 ℃, the length of the air step is 3.5 meters to 4.5 meters; if the highest tapping temperature is between 1180 ℃ and 1200 ℃, the length of the air step is 5 meters to 6 meters; and if the highest tapping temperature is between 1200 ℃ and 1220 ℃, the length of the air step is 7 meters to 8 meters.
In a possible embodiment, the steel loading interval of the second slab sequence is in the range of 200mm to 300mm, so as to control the furnace time of the second slab in the heating furnace to be between 70 minutes and 150 minutes.
In one possible embodiment, the difference between the length of the first slab and the length of the water beam in the heating furnace is not more than 1.6 meters, and the difference between the length of the second slab and the length of the water beam in the heating furnace is not more than 1.6 meters.
Based on the same inventive concept as in the previous embodiments, the embodiments of the present invention further provide a slab heating control apparatus including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any one of the slab heating control methods described above when executing the program.
Based on the same inventive concept as in the previous embodiments, the embodiments of the present invention also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of any of the slab heating control methods described above.
The technical scheme provided by the embodiment of the invention has at least the following technical effects or advantages:
according to the embodiment of the invention, a heating furnace is controlled to heat a thicker first slab sequence in a conventional manner in a first roller period, then when the distance from the tail end of the first slab sequence to the inlet of the heating furnace exceeds the idle length, a thinner second slab sequence is heated, and simultaneously, along with the movement of the second slab sequence in the heating furnace, burners of a heating section corresponding to the foremost end position of the first slab sequence in the heating furnace are sequentially closed, and the second slab sequence is heated by utilizing the residual temperature of flue gas in the heating furnace, so that the mixed heating of a thin slab and a thick slab in the same heating furnace is realized, the heating furnace required in a hot rolling process is reduced, and the production cost of the hot rolling process is reduced.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (modules, systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
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. It is therefore intended that the following claims be interpreted as including the 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 modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A method of controlling heating of a sheet, the method comprising:
determining the idle step length according to the tapping temperature of the first slab sequence;
if the highest tapping temperature in the set number of first slabs at the tail part of the first slab sequence is not more than 1160 ℃, the length of the air step is 1.5 m to 2.5 m; if the highest tapping temperature is between 1160 ℃ and 1180 ℃, the length of the air step is 3.5 meters to 4.5 meters; if the highest tapping temperature is between 1180 ℃ and 1200 ℃, the length of the air step is 5 meters to 6 meters; if the highest tapping temperature is between 1200 ℃ and 1220 ℃, the length of the air step is 7 meters to 8 meters;
in the first roller period, controlling a heating furnace to heat the first slab sequence;
controlling a second slab sequence to enter an inlet of the heating furnace at the beginning of a second roll period; the thickness of the second plate blank in the second plate blank sequence is smaller than that of the first plate blank in the first plate blank sequence; when the distance from the tail end of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, controlling the heating furnace to heat in a second roller period;
sequentially closing burners of a heating section corresponding to the tail position of the first slab sequence in the heating furnace, and heating the second slab sequence by utilizing the residual heat of flue gas in the heating furnace;
the thickness of the first slab is 200mm to 240 mm; the second slab has a thickness of 100 mm to 160 mm.
2. The slab heating control method according to claim 1, wherein before the control heating furnace heats the first slab sequence, the method further comprises:
determining the production speed of the heating furnace according to the preset hot rolling production speed;
and determining the steel loading interval of the first slab sequence and the steel loading interval of the second slab sequence according to the production speed of the heating furnace.
3. The slab heating control method according to claim 2, wherein the steel loading pitch of the second slab sequence has a value ranging from 200mm to 300mm to control the furnace time of the second slab in the heating furnace to be between 70 minutes and 150 minutes.
4. A slab heating control method according to any one of claims 1 to 3, wherein the overhanging length of the first slab on the water beam in the heating furnace is not more than 0.8 m, and the overhanging length of the second slab on the water beam in the heating furnace is not more than 0.8 m.
5. A slab heating control device for implementing the method of any one of claims 1 to 4, the device comprising:
the first control module is used for controlling the heating furnace to heat the first slab sequence in the first roller period;
the second control module is used for controlling a second slab sequence to enter an inlet of the heating furnace when a second roller period starts; the thickness of the second plate blank in the second plate blank sequence is smaller than that of the first plate blank in the first plate blank sequence; when the distance from the tail end of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, controlling the heating furnace to heat in a second roller period;
the third control module is used for sequentially closing the burners of the heating sections corresponding to the tail positions of the first slab sequences in the heating furnace and heating the second slab sequences by utilizing the residual temperature of the flue gas in the heating furnace;
the third determining module is used for determining the idle step length according to the tapping temperature of the first slab sequence before the heating furnace is controlled to heat the first slab sequence;
if the highest tapping temperature in the set number of first slabs at the tail part of the first slab sequence is not more than 1160 ℃, the length of the air step is 1.5 m to 2.5 m; if the highest tapping temperature is between 1160 ℃ and 1180 ℃, the length of the air step is 3.5 meters to 4.5 meters; if the highest tapping temperature is between 1180 ℃ and 1200 ℃, the length of the air step is 5 meters to 6 meters; and if the highest tapping temperature is between 1200 ℃ and 1220 ℃, the length of the air step is 7 meters to 8 meters.
6. The slab heating control device according to claim 5, further comprising:
the first determining module is used for determining the production speed of the heating furnace according to the preset hot rolling production speed before the heating furnace is controlled to heat the first slab sequence;
and the second determining module is used for determining the steel loading interval of the first slab sequence and the steel loading interval of the second slab sequence according to the production speed of the heating furnace.
7. A slab heating control apparatus, comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the method of any one of claims 1 to 4.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program is executed by a processor to implement the steps of the method of any of claims 1 to 4.
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| US4087238A (en) * | 1976-09-13 | 1978-05-02 | United States Steel Corporation | Method for enhancing the heating efficiency of continuous slab reheating furnaces |
| US4257767A (en) * | 1979-04-30 | 1981-03-24 | General Electric Company | Furnace temperature control |
| CN201083461Y (en) * | 2007-07-19 | 2008-07-09 | 宝山钢铁股份有限公司 | Heat accumulation type bar plate heating stove |
| CN111020173B (en) * | 2019-11-20 | 2021-09-07 | 唐山钢铁集团高强汽车板有限公司 | Method for controlling heating output of continuous annealing furnace according to thickness specification |
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