CN1028613C - Energy-saving method and device for producing hot-rolled steel belt - Google Patents
Energy-saving method and device for producing hot-rolled steel belt Download PDFInfo
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- CN1028613C CN1028613C CN 92110403 CN92110403A CN1028613C CN 1028613 C CN1028613 C CN 1028613C CN 92110403 CN92110403 CN 92110403 CN 92110403 A CN92110403 A CN 92110403A CN 1028613 C CN1028613 C CN 1028613C
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Abstract
The present invention provides a super energy-saving method and a device for producing hot-rolled steel belts. The present invention is mainly suitable for producing the hot-rolled steel belts whose thickness is from 1.8mm to 10mm, width is from 500mm to 1300mm, and yearly output is from 20 to 60 million tons. The main process of the present invention lies in that a sheet billet of which the thickness is from 30mm to 50mm is formed from molten steel by the continuous casting of a wedge-shaped crystallizer; after going out of a casting machine, the sheet billet passes through a soaking furnace and then immediately enters a continuous mill with five machine frames; finally, the sheet billet is coiled into belt rolls. The continuous casting machine and the continuous mill are in rigid connection through casting blanks, namely that continuous casting and continuous milling are synchronous. The present invention has the advantages of low energy consumption and little investment, and the ton-steel installed capacity of main energy-consumption equipment is only less than 15% of that of the existing sheet-billet continuous casting and continuous milling machine groups.
Description
The invention belongs to continuous casting and technical field of steel rolling.Be applicable to that mainly production 1.8～10mm is thick, 500～1300mm is wide, produce 20～600,000 tons hot rolled strip per year.
In the production method of hot steel band, CSP is technical advanced, and economic again a kind of method.And in existing thin plate blank continuously casting and continuously rolling technology, execute Nucor unit (the H.F. Martin " flat bar and long material production equipment expense are minimized " of Leman-Xi mark (SMS) design, European iron and steel academic discussion document in 1988), the Arvedi unit (" continuous-casting sheet billet that Italian bar milk is used " of Germany DMH limited company design, " international iron and steel epoch ", Chinese edition, the second phase in 1991) and gondola Danieli unit (" DANELIPRES.ENT RECENT DEVELPOMENTS IN HOT STRIT MINI-MILLS ", DANIELI exchanges data) all be typical CSP unit.Their main production process is: after the sheet billet of continuous casting goes out casting machine, cut off by the heavy required scale of volume, one by one by soaking pit, enter the tandem rolling unit again and be rolled then.
Above-mentioned unit all has following common characteristic:
＜1〉as the soaking pit of intermediate equipment, though each tame form difference is all very complicated, huge, and the energy consumption height, for example Nucor unit soaking furnace superintendent 162m(strand vertically advances), Danieli unit soaking furnace superintendent 40m, wide 18m(strand is traversing).
＜2〉roll-force of tandem mill and main motor current are all very big, are 4 * 7000KW as the milling train power of Nucor unit, and Arvedi unit milling train general power is 20000KW, and production line is all very long.
＜3〉these units all are to adopt separate unit casting machine and multimachine frame tandem mill to be complementary, tandem mill go into to roll the casting speed of speed greater than conticaster, but the output of whole production line only depends on conticaster output, so increase the part that mill speed causes main motor current to increase, to increasing output and inoperative.
The production method and the device of the hot steel band of ultra-power saving that the object of the present invention is to provide that a kind of energy consumption is low, equipment is simple, small investment, occupation of land are little.
Technological thought of the present invention is from making full use of the heat energy of molten steel, at first improve the performance of crystallizer, and the strand side is carried out adiabatic heat-insulation in two cold-zones, improve the ejection temperature and the temperature homogeneity of casting machine, thereby that simplifies soaking pit and improve tandem mill goes into to roll temperature, and adopts tandem rolling speed and the synchronous casting and rolling process of casting speed.Its concrete technical scheme is as follows:
1, crystallizer
The employing thick and thin stock wedge crystallizer that can reduce strand limit portion and middle portion temperature difference (apply for a patent in addition, application number is 92103257.9) of 30～50mm of casting.
The bottom of crystallizer has sufficient roller section, and they vibrate with crystallizer.Foot roller section adopts air water spraying or nitrogen blowing cooling separately, regulates the strand temperature.
2, two cold-zones
Dry method cooling and nitrogen protection are adopted in two cold-zones.Structurally the water-cooled box structure of sealing is adopted in two cold-zones, it is suitable for reading have one can be to half-open, and the seal cover board that opens and closes by hydraulic cylinder, prevent that nitrogen from flowing out, end opening then links to each other with the soaking pit that can produce a large amount of furnace gases, and whole strand passage is kept positive pressure of nitrogen, prevents the strand oxidation, high pressure water descaling device before cancellation is rolled guarantees to go into to roll temperature.
In order to reduce the temperature difference at two cold-zone strand limit portions and middle part, assembled heat screen along whole two cold-zone sides, the strand side is taked insulation and antiradiation measure.
In order to improve the ejection temperature, the liquid chip bending is adopted in two cold-zones.
3, soaking pit
Because near the soaking pit inlet on the liquid core summit of liquid chip bending and control strand, the mean temperature that makes strand go into stove can reach 1250 ℃.Therefore, the main task of soaking pit is to guarantee that whole strand temperature is even, promptly further guarantees the uniformity of strand limit portion and middle part temperature.For this reason, the soaking pit Control for Kiln Temperature gets final product about 1300 ℃, and the power of burner hearth is taked inhomogeneous distribution, stove effective length 8m, and it is 500KW that required energy consumption is amounted to electrical power.
4, hot shears
Hot shears under normal circumstances is used to cut off the defective end to end part of strand, and cuts off by the heavy required cut lengths of volume in the operation of rolling.When milling train is out of order, be used for accident and shear, cut off strand for the first time after, a middle roller is raised slightly, makes the base head lever up (under the stuck situation of tandem rolling), abdicates the space that the back strand advances, the back strand is cut into short base by certain-length, falls on the melt pit dolly under the roller-way.When this measure had been avoided milling train accidents happened, strand was blocked in and causes great trouble in the casting machine.
5, tandem mill
Tandem rolling unit of the present invention adopts five frame four-high mills.Go into to roll temperature and be controlled at 1200 ℃, it is identical with the casting speed of casting machine to go into to roll speed.To width is the strand of 1050mm when being rolled, and maximum rolling force is got 900 tons, and main transmission power is got 600KW, evenly calculate desirable value two times.
The technical process that the present invention produces hot steel band is as follows: the sheet billet that is gone out by wedge crystallizer, two cold-zone continuous castings is behind aligning, enter soaking pit, again through hot shears excision strand head, just directly entering five frame connection rolling machine is rolled, when tandem rolling is heavy to enough volumes, hot shears is cut off strand, promptly rolls afterwards earlier and cuts.The then rolling beginning of second volume.Hot shears is between soaking pit and the tandem rolling unit.Strand to go into to roll speed identical with the casting speed of casting machine, promptly continuous casting and tandem rolling carry out synchronously.
6, the automatic control of continuous casting and tandem rolling
Thin-slab caster and five frame connection rolling machine group respectively have overlaps independently automatic electrical control system, but both link together again, can switch mutually.
When carrying out the direct tandem rolling of continuous casting, synchronous for guaranteeing to carry out speed at the strand of conticaster outlet and tandem mill inlet, the control of the course of work can be divided into two stages:
1. phase I-conticaster state that works alone
From water begin to enter tandem mill to continuous casting billet before, casting speed waters curve and raises gradually by rising, until stationary value.Usually, casting speed is constant, improves mouth of a river flow, carries out the interior molten steel face of crystallizer and controls automatically.
2. second stage-continuous casting and rolling state
In fact, in the process of continuous casting and rolling, conticaster and tandem mill have been realized being rigidly connected by steel billet, and continuous casting and tandem rolling are synchronous.And the transmission power of tandem mill is much larger than the power of throwing motor, passing through under the rigidly connected situation of steel billet, strand only is subjected to the control of tandem mill entrance velocity, makes the throwing empty load of motor move, and the control of casting speed transfers control system of continuous rolling mill to by the Blank drawing machine control system.This conversion can be realized by conticaster and tandem mill automatic control system.
Compared with prior art, the present invention has following advantage:
1, energy consumption is low, can save the energy widely.
Table 1 has been enumerated the design data of the main energy consumption equipment of the present invention and Nucor unit, Arveci unit.
(table 1 is seen the literary composition back)
Found out that by table 1 ton steel installed capacity Arvedi unit is 10 times of unit of the present invention, the Nucor unit is 9 times of unit of the present invention.Total installation of generating capacity the present invention lacks 38000KW than the Arvedi unit.
2, equipment and overall procedure have been simplified
Compared with prior art, the present invention has simplified the following link:
1. water spray or air water spraying and corresponding pipe-line system, control system and the steam bleeding system of two cold-zones have been cancelled.
2. be rolled immediately owing to having adopted nitrogen protection and strand to go out casting machine, cancelled the high-pressure water descaling before rolling.
3. cancel strand limit portion eddy-current heating, and simplified huge soaking pit.
3, descend significantly owing to the roll-force that adopts the high temperature low speed rolling and bring, available little tandem rolling unit replaces big tandem mill group.
4, the machine group length shortens dramatically, and can save a large amount of rollgangs and the corresponding energy, and reduce the factory building area, has reduced investment.
Now the present invention is further illustrated in conjunction with the accompanying drawings
Accompanying drawing 1 is the main process schematic diagram of CSP of the present invention.
Accompanying drawing 2 is sufficient roller section and two a cold-zones sealed structural representation suitable for reading.
Accompanying drawing 3 is two cold-zone side insulation (heat screen) structural representations.
Among Fig. 1,1 is crystallizer, and 2 is two cold-zones, and 3 are the aligning district, and 4 is soaking pit, and 5 is hot shears, and 6 is the five frame connection rolling machine group.
Among Fig. 2,7 is the strand shell, and 1 is crystallizer, and 8 is sufficient roller, and 9 is water service pipe, and 10 is seal cover board, and 11 is the leading portion of two cold-zones, and 12 is the space of inflated with nitrogen.
Seal cover board 10 is made up of two plates that separate, and is distributed in the both sides of strand, contacts with wide of strand, forms sliding surface, in case of necessity can be oily.But seal cover board 10 water flowings cooling.Seal cover board 10 can be dismantled separately, is convenient to adjusting is installed and handle relevant accident etc.
Among Fig. 3, Fig. 4,14 is heat-insulating base, and 15 is asbestos board, and 16 is the heat shield group, and 17 is outer arc side two cold-zone wallboards, and 18 is inner arc side two cold-zone wallboards, and 19 is two cold rollers, and 20 is the inner arc seat, and 21 is two cold-zone side heat screens, and 22 is the outer arc seat.
Heat-insulating base 14 is fixed on the wallboard 17 of two cold-zone outer arc sides, and the main effect of asbestos board 15 and heat shield group 16 is the heat dissipation capacities that reduce strand shell-side limit.Because two cold-zones are to half-open box structure, the installation of these widgets, adjustment and inspection are all more convenient.
The design data of three kinds of continuous casting and continuous rolling mill kludges of table 1 capacity
The main energy consumption equipment installed capacity of unit output bandwidth KW ton steel capacity
Title kt/a mm soaking roughing finish rolling adds up to the KW/t steel
Nucor 820 1560 29500 / 4×7000 57500 0.07
2×6000
Arvedi 500 1330 20000 3×500 41500 0.083
2×4000
The present invention 450 1,050 500 5 * 600 3,500 0.008
Claims (6)
1, the hot steel band production method of a kind of ultra-power saving, main process comprise sheet blank continuous casting, after two cold-zones go out casting machine, enter the soaking pit soaking, it is rolling to advance tandem mill again, it is characterized in that:
A, adopted the wedge crystallizer that can significantly reduce the strand limit portion and the middle temperature difference;
B, by sufficient roller section is adopted the air water spraying or separately nitrogen blowing cool off and regulate the strand temperature;
Nitrogen protection and side insulation are adopted in C, two cold-zones;
After D, continuous casting billet went out casting machine, through soaking pit, it was rolling to advance five frame connection rolling machine immediately, and conticaster and tandem mill are realized being rigidly connected by strand, and promptly to go into to roll speed identical with the casting speed of strand for strand, and continuous casting and tandem rolling carry out synchronously; When treating that rolling enough volumes are heavy, cut off strand, it is rolling to begin next volume, promptly rolls afterwards earlier and cuts.
2, method according to claim 1 it is characterized in that continuous casting and tandem rolling respectively have a cover control system, and both connects, can switch mutually, after strand went into to roll, Blank drawing machine zero load, the control of casting speed are transferred to by control system of continuous rolling mill by the throwing control system to be controlled.
3, according to the described method of claim 1, it is characterized in that when the casting machine throwing normal, and tandem mill is when being out of order, hot shears is fallen into the short base of strand cuttolength on the melt pit dolly that is under the roller-way, avoids strand to be blocked in the casting machine.
4, the process units of the hot steel band of a kind of ultra-power saving, main equipment comprises crystallizer, two cold-zones, soaking pit, hot shears, tandem mill, it is characterized in that:
A, crystallizer are the sheet billet wedge crystallizer of side shield band insulation construction;
The bottom of B, crystallizer has the sufficient roller section of vibrating with crystallizer;
C, two cold-zones adopt sealing, can be to half-open, and the water-cooled box structure that opens and closes by hydraulic cylinder, suitable for reading have a seal cover board, end opening links to each other with soaking pit.
D, whole two cold-zone sides have assembled heat screen.
5, device according to claim 4, but it is characterized in that two cold-zones seal cover board suitable for reading is made up of two plates of the water flowing that separates cooling, be distributed in the both sides of strand, contact the formation sliding surface with wide of strand.
6, device according to claim 4 is characterized in that two cold-zone side heat screens are made up of heat-insulating base, asbestos board, heat shield group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92110403 CN1028613C (en) | 1992-09-07 | 1992-09-07 | Energy-saving method and device for producing hot-rolled steel belt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92110403 CN1028613C (en) | 1992-09-07 | 1992-09-07 | Energy-saving method and device for producing hot-rolled steel belt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1070133A CN1070133A (en) | 1993-03-24 |
| CN1028613C true CN1028613C (en) | 1995-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92110403 Expired - Fee Related CN1028613C (en) | 1992-09-07 | 1992-09-07 | Energy-saving method and device for producing hot-rolled steel belt |
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| Country | Link |
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| CN (1) | CN1028613C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1400003B1 (en) * | 2010-05-18 | 2013-05-09 | Danieli Off Mecc | CONTINUOUS CASTING DEVICE AND ITS PROCEDURE |
| CN106734202A (en) * | 2016-12-27 | 2017-05-31 | 中冶连铸技术工程有限责任公司 | Bar Wire Product and arrowband rolling line and its production method |
| CN108396245B (en) * | 2017-02-08 | 2019-12-13 | 鞍钢股份有限公司 | 345 MPa-level LP steel plate and production method thereof |
| CN108356076A (en) * | 2018-01-18 | 2018-08-03 | 河钢股份有限公司承德分公司 | A kind of continuous casting billet milling method |
| CN109093084B (en) * | 2018-09-29 | 2020-03-31 | 东北大学 | Method for producing continuous casting sheet billet |
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1992
- 1992-09-07 CN CN 92110403 patent/CN1028613C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1070133A (en) | 1993-03-24 |
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