CN112575176A - Continuous heating furnace arrangement mode for thick plate production and steel drawing method - Google Patents
Continuous heating furnace arrangement mode for thick plate production and steel drawing method Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 153
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 104
- 239000010959 steel Substances 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 45
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- 238000005096 rolling process Methods 0.000 claims abstract description 73
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- 230000009471 action Effects 0.000 claims abstract description 8
- 230000001360 synchronised effect Effects 0.000 claims abstract description 5
- 238000011084 recovery Methods 0.000 claims abstract description 4
- 238000002791 soaking Methods 0.000 claims abstract description 4
- 238000004513 sizing Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 abstract description 9
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 14
- 238000005086 pumping Methods 0.000 description 11
- 230000033764 rhythmic process Effects 0.000 description 9
- 238000010079 rubber tapping Methods 0.000 description 5
- 238000009749 continuous casting Methods 0.000 description 4
- 230000005571 horizontal transmission Effects 0.000 description 2
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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
- C21D9/70—Furnaces for ingots, i.e. soaking pits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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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
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
A continuous heating furnace arrangement mode and a steel drawing method for thick plate production are disclosed, wherein the heating furnace arrangement mode adopts three walking beam continuous heating furnaces to be arranged side by side, and the walking beam continuous heating furnace sequentially comprises a heat recovery section, a preheating section, a first heating section, a second heating section and a soaking section from a furnace tail to a furnace head along a furnace length direction; the material is arranged in a double-material arrangement mode, namely 2 rows of material are arranged on each heating furnace, 2 sets of walking beam mechanisms are arranged at the bottom of each heating furnace, and the 2 sets of walking beam mechanisms form synchronous actions of the walking beams through the arrangement of a connecting frame. The invention starts with the furnace body walking beam synchronism guarantee and the overall optimization of the steel drawing and loading process, ensures the efficiency of the combined production process of the fixed-size billet and the long billet, finally realizes the purpose of meeting the requirements of users on longitudinal rolling materials at the highest speed in batches and simultaneously reduces the operation cost; moreover, the efficient supply of the long billet required by longitudinally-rolled materials can be alternately realized in the traditional thick plate rolling mode operation process, the rolling efficiency is improved, and the cost is saved.
Description
Technical Field
The invention relates to a heating furnace technology, in particular to a continuous heating furnace arrangement mode for thick plate production and a steel drawing method.
Background
The thick plate product is widely applied to the fields of ship building, pipelines, bridges, buildings, engineering machinery and the like, and the domestic market keeps vigorous demands for thick plate products of different varieties and specifications in recent years. In a steel rolling area of a thick plate factory, the most typical rolling method selected on the basis of comprehensively considering the inherent continuous casting slab profile specification and the rolled large plate size designed based on the contract plate is a "forming-widening-extending" rolling method, i.e., an L-C-L rolling method (defined as C being rolling in the slab width direction and L being rolling in the slab length direction), and therefore there is a significant difference in rolling method from hot continuous rolling. The method for rolling the thick plate not only comprises the L-C-L rolling which occupies most of the rolling methods, but also comprises the rolling methods of C-L, L-C, C, L, C-L-C and the like which occupy a small proportion.
For some specific thick plate users, the required width specification of a final finished product is often close to the width specification of a continuous casting blank, and if a split plate group is not adopted, an L rolling method is often a more suitable choice. On one hand, the rolling mill can meet the size requirement required by a user, on the other hand, the waste of steel turning time caused by rolling in different directions is saved, and therefore the rolling efficiency is obviously improved. On the basis of selecting the L rolling method, if the length of the plate blank entering the furnace is long enough, multiple scales can be formed, contract plates meeting the requirements of users can be rolled in batches, the single weight of the rolled large plate is obviously increased, and the rolling efficiency is higher. For example, a user orders contract plates with the size of 20mm × 2250mm × 11000mm in batch, the rolled plate blank size can be selected to be 227mm × 2300mm × 8925mm, the rolling target size is 20mm × 2330mm × 100000mm, 30mm is the free spread amount during longitudinal rolling, and 80mm is the designed trimming amount, in this case, 9 sub-plates can be generated at one time, and the user can be delivered in time. This requires the ability of the continuous furnace to load, extract and heat 8925mm long billets. Therefore, the heating furnace is required to have the capability of heating the long billet besides the conventional capability of heating the common fixed-size billet, and the heating furnace cannot become a rhythm bottleneck in the process of producing the long billet.
At present, users with finished product specifications close to those of the width of continuous casting billets mainly come from the field of thick plates for mechanical engineering, and the market demand is large. Therefore, the old model of supplying conventional sizing billets from a continuous furnace needs to be broken, and a combined capability of simultaneously supplying long billets is required. A conventional domestic thick plate continuous heating furnace is common for heating 2600-4100 mm and 2600-4800 mm sizing blanks (specific values are related to the thickness specification of thick plate blanks and the limit specification of rolling line equipment), but related reports that the sizing blanks and the long blanks are flexibly inserted and combined to realize high-efficiency production are not seen. The operation mode of combined layout of the fixed-size blank and the long blank is also tried in two continuous heating furnaces of a Zhanjiang steel 4.2m thick plate production line, but the problems that the fixed-size blank and the long blank are frequently subjected to transition connection and are not optimized to generate pause and temperature waiting and finally influence the rolling capacity exist in most cases because the charging is directly executed according to the large layout arranged by a manufacturing management department.
Chinese patent CN200820219667 discloses a thick plate heating furnace tapping machine. The automatic tapping device comprises a lifting device, a horizontal transmission device and a discharging rod connected with the lifting device and the horizontal transmission device, and is characterized by realizing rapid tapping, small occupied space, compact equipment structure, stable transmission, safe and reliable use, flexible and accurate operation, reduced furnace door opening time, reduced radiation heat loss in a furnace, light equipment weight and convenient equipment maintenance. The patent emphasizes the local improvement of the steel pumping machine body equipment, and does not make a system scheme aiming at the steel pumping method of different types of parisons.
Chinese patent CN201510616266 discloses a high-precision heating furnace steel-drawing positioning control method. The control method can simply and effectively ensure that the slab is drawn to the position of the central line of the discharging roller way, improve the positioning precision of the slab on the roller way after steel is drawn, and reduce the frequency of steel blocking when the slab enters the rolling mill due to inaccurate positioning. The patent is still limited to the improvement of the precision of the specific action of the specific steel drawing step, and no system scheme is made for the steel drawing method of different types of parisons.
Chinese patent CN200410066361 discloses a simulated steel rolling system, which belongs to a single-layer simulation system on the process computer level, and can be used for comprehensive debugging, on-site cold load test and hot load test of a simulation application system. The system consists of three simulators, wherein one important simulator is a steel drawing simulator, and the steel drawing simulator can simulate steel drawing messages from a heating furnace, generate a tracking starting pointer of a rolling line area, insert a request starting event and prepare for automatic sending of subsequent events. The patent focuses on tracking all events generated on a rolling line from the perspective of a rolling mill process machine of hot continuous rolling and then triggering the next steel drawing time.
Chinese patent CN201010209031 discloses an equal-gap steel rolling control method. The control steps of the computer control system in the method are as follows: judging the steel-drawing heating furnace at the time and the next steel-drawing heating furnace; reading the steel pumping machine operation time transmitted by a next steel pumping heating furnace monitoring sensor, the roller running speed transmitted by a speed sensor and a time sensor on the roller and the actual interval time of the two adjacent front plate blanks reaching the rolling mill; calling a storage formula, and calculating the waiting time corresponding to the next steel-drawing heating furnace; controlling the heating furnace to pump steel when the waiting time is up; and starting the calculation of the waiting time of next steel drawing once steel drawing is finished, and determining the heating furnace of the next steel drawing according to the minimum waiting time principle.
Disclosure of Invention
The invention aims to provide a continuous heating furnace arrangement mode and a steel drawing method for thick plate production, which start from furnace body walking beam synchronism guarantee and overall optimization of the steel drawing and loading process, ensure the efficiency of the combined production process of a fixed-size billet and a long billet, finally realize the fastest batch quantity and meet the requirement of a user on a longitudinal rolling material, and simultaneously reduce the operation cost; moreover, the efficient supply of the long billet required by longitudinally-rolled materials can be alternately realized in the traditional thick plate rolling mode operation process, the rolling efficiency is improved, and the cost is saved.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a continuous heating furnace arrangement mode for thick plate production adopts three walking beam continuous heating furnaces arranged side by side, wherein the walking beam continuous heating furnace sequentially comprises a heat recovery section, a preheating section, a first heating section, a second heating section and a soaking section from a furnace tail to a furnace head along the furnace length direction; the material is arranged in a double-material arrangement mode, namely 2 rows of material are arranged on each heating furnace, 2 sets of walking beam mechanisms are arranged at the bottom of each heating furnace, and the 2 sets of walking beam mechanisms form synchronous actions of the walking beams through the arrangement of a connecting frame.
The invention relates to a steel pumping method for a continuous heating furnace arrangement mode for thick plate production, wherein three walking beam continuous heating furnaces are provided with fixed-size blanks and long blanks, and are provided with 12-18 long blanks and then provided with 12-18 fixed-size blanks; the steel drawing side is matched with the blank length type of the steel loading side, namely a long blank is loaded when the long blank is drawn, and a fixed blank is loaded when the fixed blank is drawn; wherein the length of the fixed length blank is less than 4.8 meters, and the length of the long blank is at least 5 meters.
Preferably, if the sizing block is being loaded during the drawing, 2 sizing blocks are loaded in the area by using a steel loading roller way between adjacent furnaces.
The invention also discloses a steel drawing method adopting the arrangement mode of the continuous heating furnace for thick plate production, which is characterized in that in the three walking beam continuous heating furnaces, one walking beam continuous heating furnace is completely provided with a long blank, and the other two walking beam continuous heating furnaces are completely provided with fixed size blanks; after 4-8 fixed-size blanks are extracted, namely 2-4 blanks are extracted from each of the two heating furnaces for accommodating the fixed-size blanks, and then 1 long blank is extracted; wherein the length of the fixed length blank is less than 4.8 meters, and the length of the long blank is at least 5 meters.
Preferably, the corresponding types of plate blank waiting materials are arranged on the steel loading roller way corresponding to the furnace door area of the three walking beam continuous heating furnace.
Preferably, in the three walking beam continuous heating furnaces, one walking beam continuous heating furnace close to the rolling mill side is completely filled with the long billet.
Furthermore, the invention adopts the steel pumping method of the arrangement mode of the continuous heating furnace for thick plate production, and is characterized in that in the three walking beam continuous heating furnaces, two walking beam continuous heating furnaces are all provided with long billets, and one walking beam continuous heating furnace is all provided with sizing billets; after 2-4 long blanks are extracted, namely 1-2 long blanks are extracted from the two walking beam continuous heating furnaces for holding the long blanks respectively, and then 2 fixed-size blanks are extracted; wherein the length of the fixed length blank is less than 4.8 meters, and the length of the long blank is at least 5 meters.
Preferably, in the three walking beam continuous heating furnaces, one walking beam continuous heating furnace close to the rolling mill side is completely provided with the sizing bar blank.
Preferably, the corresponding types of plate blank waiting materials are arranged on the steel loading roller way corresponding to the furnace door area of the three walking beam continuous heating furnace.
In the steel drawing scheme of the invention:
1)3 continuous heating furnaces, all having the layout of fixed size base, long base:
3 continuous heating furnaces, under the condition of keeping medium and low load production, all furnaces are equipped with layout of fixed-size billets and long billets. The production mode under the layout is consistent for the operation mode of each furnace, but the furnace temperature setting needs to be frequently adjusted and the production rhythm needs to be estimated in advance. The specific technical points comprise: after 12-18 long blanks are dug, 12-18 fixed blanks are inserted. In order to meet the stable connection of rolling and heating rhythm, the blank length types of the steel drawing side and the steel loading side are matched, a long blank is taken out when the blank is long, and a fixed blank is taken out when the blank is fixed. If the fixed-size blanks are being loaded during the drawing of the long blanks, steel loading operators fully utilize the steel loading roller ways between the adjacent furnaces as much as possible, so that 2 fixed-size blanks are in the area, the blanks in front of the furnaces are sufficient, and the loading of the furnaces does not stop.
2)3 continuous heating furnaces, 1 layout long blank and 2 layout sizing blanks
The 3 continuous heating furnaces centralize the long billet with 1 furnace (preferably close to the rolling mill side), and the 2 heating furnaces can be used as the steel drawing plan rhythm of the conventional double furnaces to meet the rolling line requirement due to the sufficient capacity of supplying the fixed-size billet. The heating furnace of the long billet can optimize the steel drawing rhythm of the furnace according to the charging temperature of the long billet, the heating speed of the steel of the long billet and the target discharging temperature of the steel of the long billet, and intermittently insert the steel drawing plan. The production mode under the layout is to classify and pre-arrange a large rolling plan in advance, two heating furnaces are specially used for fixed-size billets, one heating furnace is specially used for long billets, and the adjustment workload of the furnace temperature of each heating furnace and the small plan is small.
The invention has the beneficial effects that:
1. the steel drawing method can furthest improve the rolling capacity on the basis of meeting the requirements of specific users on thick plate longitudinally-rolled products and under the condition of not changing the section specification of the original continuous casting billet;
2. according to the invention, through the steel drawing technical scheme under different production combinations, the flexible combination of the fixed-size blank and the long blank can be realized, so that the production efficiency is optimized;
3. the invention directly inserts the thick plate long blank into the furnace material, reduces the secondary cutting procedure of the plate blank, accelerates the logistics of the plate blank warehouse and reduces the cost.
Drawings
FIG. 1 shows different types of sheet blank distribution in the heating furnace of the present invention;
FIGS. 2 to 7 show the combination of fixed-length blanks and long blanks of three heating furnaces in steel drawing mode; wherein:
FIG. 2 shows a schematic view of the arrangement of 12 long blanks in succession of 12 fixed-size blanks;
FIG. 3 shows a schematic view of the arrangement of 12 long blanks in succession with 18 fixed-size blanks;
FIG. 4 shows a pattern in which 18 long blanks and 12 fixed-size blanks are arranged in succession;
FIG. 5 shows a schematic view of the arrangement of 18 long blanks in succession with 18 fixed-size blanks;
FIG. 6 shows a schematic view of the arrangement of 15 long blanks in succession with 12 fixed-size blanks;
FIG. 7 shows a schematic view of the arrangement of 15 long blanks in succession of 18 fixed-size blanks;
FIG. 8 shows a two-furnace fixed-length billet and one-furnace long billet steel-drawing mode according to the present invention;
FIG. 9 shows two heating furnace long billets and one heating furnace fixed-length billet steel-drawing mode according to the present invention;
in the figure, 10 is a rolling mill, 20 is a descaling box, 30 is a steel drawing roller way, 40 is a steel loading roller way, and 50 is a heating furnace; 1 is a long blank and 2 is a fixed-size blank.
Detailed Description
Referring to fig. 1, the arrangement of the continuous heating furnace for thick plate production according to the present invention adopts three walking beam continuous heating furnaces 50 arranged side by side, wherein the walking beam continuous heating furnace sequentially comprises a heat recovery section, a preheating section, a first heating section, a second heating section and a soaking section from the furnace tail to the furnace head along the furnace length direction; the material discharging adopts a double material discharging mode, namely 2 rows of material discharging are arranged on each heating furnace 50, 2 sets of walking beam mechanisms are arranged at the bottom of the heating furnace, and the 2 sets of walking beam mechanisms form the synchronous action of the walking beams through arranging a connecting frame.
Thus, 2 fixed size blanks can be loaded in double rows, and one long blank can also be loaded in double rows.
In fig. 1, the solid beam is a fixed beam 501, the dotted beam is a movable beam 502, and 4 movable beams realize integral connection and synchronous action through a connecting frame between 2 rows of walking beam mechanisms.
The first row in fig. 1 is a typical double-row feeding 2 fixed size blanks 2, the allowable length interval of the fixed size blank 2 can be indicated by a trapezoid in the figure, the upper side of the trapezoid is the lower limit of the allowable length of the fixed size blank (e.g. 2600mm), and the lower side of the trapezoid is the upper limit of the allowable length of the fixed size blank 2 (e.g. 4100 mm);
the second row in fig. 1 is an allowable length interval of the long billet 1 that can be loaded across 3 fixed beams, 3 movable beams;
the third row in fig. 1 is an allowable length interval of the long billet 1 that can be loaded across all the beams (including 4 fixed beams, 4 movable beams). The allowable upper limit of the length of the long billet 1 in the second row needs to consider that the thermal expansion slab does not scratch the 4 th movable beam, and the allowable upper limit of the length of the long billet 1 in the third row needs to consider that the thermal expansion slab does not scratch the inner wall of the furnace in the traveling process in the furnace.
In the aspects of length measurement and checking, centering action, weighing and checking, image tracking and stokehole positioning before the continuous furnace is charged, automatic setting and tracking are realized on the basis of two charging modes of a sizing billet and a long billet into the furnace; in the steel drawing process, the actions of the steel drawing machine and the steel drawing side furnace door can be automatically set based on the identification of the fixed size blank and the long blank, and the steel drawing machine can accurately draw the fixed size blank and the long blank.
The invention adopts the steel pumping method of the arrangement mode of the continuous heating furnace for thick plate production, three walking beam continuous heating furnaces are all provided with fixed size blanks and long blanks, and 12-18 long blanks are loaded and then 12-18 fixed size blanks are loaded; the steel drawing side is matched with the blank length type of the steel loading side, namely a long blank is loaded when the long blank is drawn, and a fixed blank is loaded when the fixed blank is drawn; wherein the length of the fixed length blank is less than 4.8 meters, and the length of the long blank is at least 5 meters.
Preferably, if the sizing block is being loaded during the drawing, 2 sizing blocks are loaded in the area by using a steel loading roller way between adjacent furnaces.
The invention adopts the steel pumping method of the arrangement mode of the continuous heating furnace for thick plate production, three walking beam continuous heating furnaces, wherein one walking beam continuous heating furnace is completely provided with a long blank, and the other two walking beam continuous heating furnaces are completely provided with fixed size blanks; after 4-8 fixed-size blanks are extracted, namely 2-4 blanks are extracted from each of the two heating furnaces for accommodating the fixed-size blanks, and then 1 long blank is extracted; wherein the length of the fixed length blank is less than 4.8 meters, and the length of the long blank is at least 5 meters.
Preferably, the corresponding types of plate blank waiting materials are arranged on the steel loading roller way corresponding to the furnace door area of the three walking beam continuous heating furnace.
Preferably, in the three walking beam continuous heating furnaces, one walking beam continuous heating furnace close to the rolling mill side is completely filled with the long billet.
The invention adopts the steel pumping method of the arrangement mode of the continuous heating furnace for thick plate production, three walking beam continuous heating furnaces, two walking beam continuous heating furnaces are all provided with long blanks, and one walking beam continuous heating furnace is all provided with fixed size blanks; after 2-4 long blanks are extracted, namely 1-2 long blanks are extracted from the two walking beam continuous heating furnaces for holding the long blanks respectively, and then 2 fixed-size blanks are extracted; wherein the length of the fixed length blank is less than 4.8 meters, and the length of the long blank is at least 5 meters.
Preferably, in the three walking beam continuous heating furnaces, one walking beam continuous heating furnace close to the rolling mill side is completely provided with the sizing bar blank.
Preferably, the corresponding types of plate blank waiting materials are arranged on the steel loading roller way corresponding to the furnace door area of the three walking beam continuous heating furnace.
Example 1 combination of fixed-length billet and long billet of three heating furnaces in steel drawing mode
In this embodiment, there are six typical combinations that the number of blocks loaded in the continuous small batch of long billets is 12, 15, 18 blocks per furnace, and the number of blocks loaded in the continuous small batch of fixed billets matching the number of blocks loaded in the continuous small batch of fixed billets is 12, 18 blocks per furnace.
See fig. 2, a pattern in which 12 long blanks 1 are laid out in succession with 12 fixed blanks 2.
3 walking beam continuous heating furnaces capable of meeting the annual capacity of rolling the thick plates of 300 ten thousand tons are provided, the rated hourly output of each heating furnace is 330t/h, and the maximum hourly output is 360 t/h. In the rolling plan, the specification range of the fixed size blank 2 is about 227mm multiplied by 1900mm multiplied by 3500mm, the specification range of the long blank 1 is about 227mm multiplied by 1900mm multiplied by 8000mm, and the number of the two types of blank is relatively close, at this time, 12 long blanks 1 and 12 fixed size blanks 2 in each heating furnace are selected to be adjacently spaced and combined for production, and the width specification of the fixed size blanks is more than or equal to 2100 mm.
And keeping the type of the billet length of the steel drawing side and the steel loading side matched with the type of the long billet during drawing, and keeping the length of the fixed billet during drawing. In the embodiment, when the long billet is being drawn for rolling, 9 long billets 1 at the door of the discharging furnace wait for steel drawing; meanwhile, 3 long billets 1 are just charged into the furnace, and 9 long billets 1 wait for charging at the door of the charging furnace.
See fig. 3, a pattern in which 12 long blanks 1 are laid out in succession with 18 fixed blanks 2.
3 walking beam continuous heating furnaces capable of meeting the annual capacity of rolling the thick plates of 300 ten thousand tons are provided, the rated hourly output of each heating furnace is 330t/h, and the maximum hourly output is 360 t/h. In the rolling plan, the specification range of the fixed size blank is about 227mm multiplied by 1900mm multiplied by 3500mm, the specification range of the long blank is about 227mm multiplied by 1900mm multiplied by 8000mm, and the number of the two types of plate blanks is relatively close, at this moment, 12 long blanks 1 and 18 fixed size blanks 2 in each heating furnace are selected to be adjacently spaced and combined to produce, and at this moment, the width specification of the fixed size blank is less than 2100 mm.
And keeping the type of the billet length of the steel drawing side and the steel loading side matched with the type of the long billet during drawing, and keeping the length of the fixed billet during drawing. For example, in the present example, rolling is being performed while drawing long billets, and 9 long billets 1 are waiting for steel drawing at the door of the discharging furnace; meanwhile, 3 long billets 1 and 9 long billets 1 are just charged into the furnace to be waited for charging steel.
See fig. 4, a pattern of 18 long blanks in succession with 12 fixed-size blanks.
3 walking beam continuous heating furnaces capable of meeting the annual capacity of rolling the thick plates of 300 ten thousand tons are provided, the rated hourly output of each heating furnace is 330t/h, and the maximum hourly output is 360 t/h. In the rolling plan, the specification range of the fixed size blank is about 227mm multiplied by 1900mm multiplied by 3500mm, the specification range of the long blank is about 227mm multiplied by 1900mm multiplied by 8000mm, and the number of the two types of plate blanks is relatively close, at this moment, 18 long blanks 1 and 12 fixed size blanks 2 in each heating furnace are selected to be adjacently spaced for carrying out combined production, and at this moment, the width specification of the fixed size blank 2 is more than or equal to 2100 mm.
And keeping the type of the billet length of the steel drawing side and the steel loading side matched with the type of the long billet during drawing, and keeping the length of the fixed billet during drawing. For example, in the present example, rolling is being performed while drawing long billets, and 12 long billets are waiting for steel drawing at the door of the discharging furnace; meanwhile, 6 long billets 1 and 12 long billets 1 are just charged into the furnace to be waited for charging steel.
See fig. 5, a pattern of 18 long blanks in succession with 18 fixed-size blanks.
3 walking beam continuous heating furnaces capable of meeting the annual capacity of rolling the thick plates of 300 ten thousand tons are provided, the rated hourly output of each heating furnace is 330t/h, and the maximum hourly output is 360 t/h. In the rolling plan, the specification range of the fixed size blank is about 227mm multiplied by 1900mm multiplied by 3500mm, the specification range of the long blank is about 227mm multiplied by 1900mm multiplied by 8000mm, and the number of the two types of plate blanks is relatively close, at this moment, 18 long blanks and 18 fixed size blanks in each heating furnace are selected to be adjacently spaced and combined to produce, and the width specification of the fixed size blank is less than 2100 mm.
And keeping the type of the billet length of the steel drawing side and the steel loading side matched with the type of the long billet during drawing, and keeping the length of the fixed billet during drawing. In the embodiment, when the long billet is being drawn for rolling, 12 long billets 1 at the door of the discharging furnace wait for steel drawing; meanwhile, 6 long billets 1 and 12 long billets 1 are just charged into the furnace to be waited for charging steel.
See fig. 6, a pattern in which 15 long blanks 1 are laid out in succession with 12 fixed-size blanks 2.
3 walking beam continuous heating furnaces capable of meeting the annual capacity of rolling the thick plates of 300 ten thousand tons are provided, the rated hourly output of each heating furnace is 330t/h, and the maximum hourly output is 360 t/h. In the rolling plan, the specification range of the fixed size blank is about 227mm multiplied by 1900mm multiplied by 3500mm, the specification range of the long blank is about 227mm multiplied by 1900mm multiplied by 8000mm, and the number of the two types of plate blanks is relatively close, at this moment, 15 long blanks 1 and 12 fixed size blanks 2 of each heating furnace are selected to be adjacently spaced for carrying out combined production, and the width specification of the fixed size blank is more than or equal to 2100 mm.
And keeping the type of the billet length of the steel drawing side and the steel loading side matched with the type of the long billet during drawing, and keeping the length of the fixed billet during drawing. In this embodiment, rolling is performed while drawing a long billet, and 12 long billets are waiting for steel drawing at the door of the discharging furnace; meanwhile, 3 long billets 1 and 12 long billets 1 are just charged into the furnace to be waited for charging steel.
See fig. 7, a pattern in which 15 long blanks 1 are laid out in succession with 18 fixed-size blanks 2.
3 walking beam continuous heating furnaces capable of meeting the annual capacity of rolling the thick plates of 300 ten thousand tons are provided, the rated hourly output of each heating furnace is 330t/h, and the maximum hourly output is 360 t/h. In the rolling plan, the specification range of the fixed size blank is about 227mm multiplied by 1900mm multiplied by 3500mm, the specification range of the long blank is about 227mm multiplied by 1900mm multiplied by 8000mm, and the number of the two types of plate blanks is relatively close, at this time, 15 long blanks and 18 fixed size blanks in each heating furnace are selected to be adjacently spaced and combined to produce, and the width specification of the fixed size blank is less than 2100 mm.
And keeping the type of the billet length of the steel drawing side and the steel loading side matched with the type of the long billet during drawing, and keeping the length of the fixed billet during drawing. In the embodiment, when the long billet is being drawn for rolling, 12 long billets 1 at the door of the discharging furnace wait for steel drawing; meanwhile, 3 long billets 1 and 12 long billets 1 are just charged into the furnace to be waited for charging steel.
The various typical combination modes are organized as follows:
| typical combination schema diagram | Number of long billets | Number of sizing blocks | Width of sizing blank |
| FIG. 2 | 12 | 12 | ≥2100 |
| FIG. 3 | 12 | 18 | ＜2100 |
| FIG. 4 | 18 | 12 | ≥2100 |
| FIG. 5 | 18 | 18 | ＜2100 |
| FIG. 6 | 15 | 12 | ≥2100 |
| FIG. 7 | 15 | 18 | ＜2100 |
In particular, if there are only small batches of not more than 11 billets in the rolling plan, the small batches are relatively uniformly distributed and loaded into three furnaces, and for the next 18 billets with a fixed length, it is preferable to select a section with a width greater than or equal to 2100 mm.
Example 2
Referring to fig. 8, two heating furnace fixed-size blanks and one heating furnace long blank steel-drawing mode.
3 walking beam continuous heating furnaces capable of meeting the annual capacity of rolling the thick plates of 300 ten thousand tons are provided, the rated hourly output of each heating furnace is 330t/h, and the maximum hourly output is 360 t/h. In the rolling plan, the specification range of the fixed size blank is about 227mm multiplied by 1900mm multiplied by 3500mm, the hot charging temperature is about 500 ℃ and the target tapping temperature is 1080 ℃, the specification range of the long blank is about 227mm multiplied by 1900mm multiplied by 8000mm, the cold blank charging and target tapping temperature is 1150 ℃, the number of the fixed size blank is far more than that of the long blank, the arrangement and the charging mode of the long blank and the fixed size blank in small batches at intervals is not suitable for selection, therefore, the long blank is arranged to the heating furnace close to the side of the rolling mill in a centralized way to be used as a buffer regulator, and the other two heating furnaces produce the fixed size blank according to the conventional method.
Considering that the working load of the special long billet heating furnace is higher than that of the special fixed billet heating furnace, the fixed billet drawing rhythm is that steel is drawn according to 150s, and after 8 fixed billets 2 are drawn (namely after 4 blocks are drawn out from each of the two special fixed billet heating furnaces), 1 long billet 1 is drawn. On the steel loading roller way 40, the same type of plate blanks synchronously follow the steel pumping rhythm.
Example 3
Referring to fig. 9, two heating furnace fixed-size blanks and one heating furnace long blank steel-drawing mode.
3 walking beam continuous heating furnaces capable of meeting the annual capacity of rolling the thick plates of 300 ten thousand tons are provided, the rated hourly output of each heating furnace is 330t/h, and the maximum hourly output is 360 t/h. In the rolling plan, the specification range of the fixed size blanks is about 227mm multiplied by 1900mm multiplied by 3500mm, the cold charging furnace and target discharging temperature is 1150 ℃, the specification range of the long blanks is about 227mm multiplied by 1900mm multiplied by 8000mm, the hot charging temperature is about 500 ℃ and target discharging temperature is 1080 ℃, the number of the long blanks is far more than that of the fixed size blanks, the arrangement and charging mode of the long blanks and the fixed size blanks in small batches at intervals is not suitable for selection, therefore, the fixed size blanks are arranged to the heating furnace close to the side of the rolling mill in a centralized mode to serve as a buffer modifier, and the other two heating furnaces produce the long blanks.
Considering that the working load of the special-supply fixed-size billet heating furnace is higher than that of the special-supply long billet heating furnace, the steel is extracted according to 140s in the long billet extraction rhythm, and after 4 long billets 1 are extracted (namely after 2 long billets are extracted from the two special-supply long billet heating furnaces), 2 fixed-size billets 2 are extracted. On the steel loading roller way 40, the same type of plate blanks synchronously follow the steel pumping rhythm.
Claims (9)
1. A continuous heating furnace arrangement mode for thick plate production is characterized in that three walking beam continuous heating furnaces are arranged side by side, and the walking beam continuous heating furnace sequentially comprises a heat recovery section, a preheating section, a first heating section, a second heating section and a soaking section from a furnace tail to a furnace head along a furnace length direction; the material is arranged in a double-material arrangement mode, namely 2 rows of material are arranged on each heating furnace, 2 sets of walking beam mechanisms are arranged at the bottom of each heating furnace, and the 2 sets of walking beam mechanisms form synchronous actions of the walking beams through the arrangement of a connecting frame.
2. A steel drawing method using the arrangement of the continuous heating furnace for the production of thick plates according to claim 1, characterized in that three walking beam continuous heating furnaces are each charged with a fixed size billet, a long billet, 12 to 18 long billets and 12 to 18 fixed size billets alternately; the steel drawing side is matched with the blank length type of the steel loading side, namely a long blank is loaded when the long blank is drawn, and a fixed blank is loaded when the fixed blank is drawn; wherein the length of the fixed length blank is less than 4.8 meters, and the length of the long blank is at least 5 meters.
3. A method as claimed in claim 2, wherein if the billet is being charged during drawing, 2 billets are being charged in the area by means of a charging table between adjacent furnaces.
4. A method of drawing steel using the arrangement of the continuous heating furnace for thick plate production according to claim 1, wherein among the three walking beam continuous heating furnaces, one of the walking beam continuous heating furnaces is completely charged with long billets, and the other two walking beam continuous heating furnaces are completely charged with sizing billets; after 4-8 fixed-size blanks are extracted, namely 2-4 blanks are extracted from each of the two heating furnaces for accommodating the fixed-size blanks, and then 1 long blank is extracted; wherein the length of the fixed length blank is less than 4.8 meters, and the length of the long blank is at least 5 meters.
5. The steel drawing method according to claim 4, wherein the corresponding type of slab stock is provided on the steel loading roller bed corresponding to the furnace door area of the three walking beam continuous heating furnace.
6. The steel drawing method according to claim 4 or 5, wherein, of the three walking beam continuous furnaces, one walking beam continuous furnace near the rolling mill side is entirely charged with the long slab.
7. A steel drawing method using the arrangement of the continuous heating furnace for thick plate production according to claim 1, wherein in the three walking beam continuous heating furnaces, two walking beam continuous heating furnaces are all provided with long billets, and one walking beam continuous heating furnace is all provided with sizing billets; after 2-4 long blanks are extracted, namely 1-2 long blanks are extracted from the two walking beam continuous heating furnaces for holding the long blanks respectively, and then 2 fixed-size blanks are extracted; wherein the length of the fixed length blank is less than 4.8 meters, and the length of the long blank is at least 5 meters.
8. The method of drawing steel as claimed in claim 7, wherein the three walking beam continuous furnaces, one of which is adjacent to the rolling mill side, are all sized.
9. The steel drawing method according to claim 7 or 8, wherein the corresponding type of slab waiting materials are arranged on the steel loading roller way corresponding to the furnace door area of the three walking beam continuous heating furnace.
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