CN104032250B - Hot-dip galvanized steel strip segmentation essence control formula Technology for Heating Processing and alloying furnace thereof - Google Patents
Hot-dip galvanized steel strip segmentation essence control formula Technology for Heating Processing and alloying furnace thereof Download PDFInfo
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Abstract
The invention discloses a kind of hot-dip galvanized steel strip segmentation essence control formula Technology for Heating Processing and alloying furnace thereof.This technique is that the strip steel of output from zinc pot is sequentially carried out heating, insulation, cooling, finally realize the process with steel alloying, it is crucial that in the relative jet in strip steel two sides, make to form multiple tracks in the soaking zone of middle part and be perpendicular to the high temperature air screen of strip steel conveying direction, and the temperature signal in each marker space of high temperature air screen formation is transmitted in time to middle control PLC processor, control PLC processor is made to control the power of the jet velocity of high temperature air screen in each marker space, air screen temperature and resistance heater in real time, thus the holding temperature accurately controlled in each marker space.Its alloying furnace includes bottom-heated section, middle part soaking zone and top cooling section, and designing points is to be respectively provided with sealing air knife generator in three compartmented exits of middle part soaking zone.The present invention can suppress the generation of " stack effect ", reduces the heat dissipation of soaking zone, improves heat treatment efficiency.
Description
Technical field
The present invention relates to hot-dip galvanized steel strip and manufacture field, in particular to a kind of hot-dip galvanized steel strip segmentation essence control formula Technology for Heating Processing and alloying furnace thereof.
Background technology
Hot-dip galvanizing sheet steel is because of its relatively low production cost, good decay resistance, coating performance, welding performance and shock resistance, it is highly suitable to be applied for the high-grade galvanizing product consumption industry such as automobile, household electrical appliances, it is possible to meet user's prescription to product high-quality surface characteristic and good internal performance.
From zinc pot, the hot-dip galvanized steel strip of output typically requires and completes multistage heat treatment in alloying furnace, and technique current in the world is the annealing treating process of " after first high temperature low temperature ", and according to different steel grades, its technological temperature and temperature retention time also have fine distinction.But, in substantial amounts of produced on-site is put into practice, the difficulties existed is in that hot-dip galvanized steel strip stability requirement of alloying reaction temperature needed for alloying furnace bringing-up section, soaking zone and cooling section is higher, and slightly deviation just cannot obtain good alloying layer and good anti-powdering characteristic.
At present, the alloying furnace many employings vertical form in commercial Application, stove is positioned at directly over air knife.Being respectively disposed with bottom-heated section, middle part soaking zone and top cooling section in air knife upward direction, every section of temperature is required for following annealing process curve and rate request (i.e. temperature retention time).Traditional middle part soaking zone many employings all-sealed structure, only both ends open makes strip steel pass through, and is provided with electromagnetic induction or thermal resistance heater therein, for the insulation of strip steel, completes the alloying annealing process of strip steel.The initial temperature of strip steel alloying annealing is zinc liquid about 460 DEG C in zinc pot, heats then through bottom-heated section, reaches about 530～550 DEG C and enters middle part soaking zone and keep a period of time, to obtain good alloying layer.
But, it is subject to the impact of the alloying furnace " stack effect " of vertical, even if when stove integral sealing is intact, heat is also very easily upwards emitted to upper end from soaking zone lower end, middle part, lower end is then entered by cold air and supplements, causing soaking zone upper end, middle part temperature higher than lower end, its harm is mainly reflected in four aspects: one, whole technical process cannot meet the requirement of " after first high temperature low temperature ", and quality can not be stablized；Two, the quickly dissipation of heat cannot guarantee that middle part soaking zone is maintained at the technological temperature of 530～550 DEG C, holding temperature only 480 DEG C sometimes, even cannot smoothly complete alloying process；Three, the heat dissipated away by middle part soaking zone is relatively big, and strip steel upper end temperature is higher, the cooling capacity of upper end cooling section can be proposed high requirement, have impact on product quality further；Four, miscellaneous equipment after plating is also caused adverse effect by heat loss, reduces service life.
In order to solve the problems referred to above, middle part soaking zone is designed to the structure combined by removable thermal insulation section and fixed insulation by those skilled in the art, reduces, mainly through regulating the position between removable thermal insulation section and fixed soaking zone, the heat loss that middle part soaking zone causes because of " stack effect ".But owing to middle part soaking zone effectively not being separated, wherein the resistance heater of each section adopts opened loop control, it is heated according to predetermined temperature, different intersegmental thermal field generation couplings, cause that heat energy burst size not easily accurately controls, holding temperature controls easily exception, and heat insulation effect exists bigger uncertainty, produces alloying performance inconsistency.Further, the heat loss that removable thermal insulation section is bigger with the intersegmental existence of fixed insulation, fixed soaking zone outlet temperature is still higher because of " stack effect " temperature, follow-up top cooling section equipment is produced bigger adverse effect, causes cooling capacity wretched insufficiency.
Summary of the invention
Present invention aim to provide one can suppress the unordered fluctuation of thermal current, reduce air-flow " stack effect " cause heat leakage, realize middle part soaking zone temperature accurately control and then guarantee products obtained therefrom stay-in-grade hot-dip galvanized steel strip segmentation essence control formula Technology for Heating Processing and alloying furnace thereof.
For achieving the above object, hot-dip galvanized steel strip segmentation essence control formula Technology for Heating Processing designed by the present invention, being that the strip steel of output from zinc pot is sequentially carried out heating, insulation, cooling online, finally realize the process with steel alloying, it is characterized in that it comprises the steps:
1) strip steel processed through galvanizing is first delivered to the bottom-heated section of alloying furnace, and controlling heating-up temperature is 520～560 DEG C, and heat time heating time is 5～8s；
2) then strip steel being delivered up the middle part soaking zone to alloying furnace, controlling holding temperature is 500～550 DEG C, and temperature retention time is 10～15s；Meanwhile, by the mode in the relative jet in strip steel two sides, make to form multiple tracks in the soaking zone of middle part and be perpendicular to the high temperature air screen of strip steel conveying direction, and the temperature signal in each marker space formed by high temperature air screen transmits in time to middle control PLC processor, control PLC processor is made to control the power of the jet velocity of high temperature air screen in each marker space, air screen temperature and resistance heater in real time, thus the holding temperature accurately controlled in each marker space, intercept the stack effect in the soaking zone of middle part；
3) strip steel finally continues up the top cooling section being delivered to alloying furnace, and controlling outlet temperature is 280～320 DEG C.
Preferably, described step 1) in, controlling heating-up temperature is 530～550 DEG C；Described step 2) in, controlling holding temperature is 520～550 DEG C.Strip steel controls its temperature in the scope of 530～550 DEG C when bottom-heated section, and strip steel controls its temperature in the scope of 520～550 DEG C when middle part soaking zone, it is possible to obtain the alloying layer that quality is higher.
Preferably, described step 2) in, the jet velocity of high temperature air screen is 20～60m/s, and air screen temperature is 400～600 DEG C, so that the better effects if of middle part soaking zone segmentation insulation.
Best, described step 2) in, the jet velocity of high temperature air screen is 30～50m/s, and air screen temperature is 490～550 DEG C, and the effect that can make middle part soaking zone segmentation insulation is best.
The present invention realizes the hot-dip galvanized steel strip segmentation essence control formula alloying furnace that above-mentioned technique designs, including bottom-heated section, middle part soaking zone and top cooling section, being provided with induction heater in described bottom-heated section, be provided with resistance heater in the soaking zone of described middle part, it is characterized in that
Described middle part soaking zone is integral cavity structure, it is arranged at intervals with many sets and seals air knife generator, a pair nozzle of described sealing air knife generator is perpendicular to two sides of strip steel and arranges in opposite directions, can form the high temperature air screen being perpendicular to its conveying direction during work in the two sides of strip steel；
Each marker space that described high temperature air screen is formed is provided with zone temperature sensor, the signal output part of described zone temperature sensor all electrically connects with the input of same middle control PLC processor, the end that controls of described middle control PLC processor then electrically connects with the resistance heater in each marker space and corresponding sealing air knife generator respectively, thus the holding temperature accurately controlled in each marker space.
Preferably, described middle part soaking zone is incubated one section, middle part insulation two-stage nitration and middle part insulation three sections by middle part from bottom to top and is tightly connected and forms, described sealing air knife generator is provided with three sets, it is arranged in middle part insulation one section, middle part insulation two-stage nitration and middle part and is incubated the exit of three sections, thus forming three marker spaces.So, three sets seal air knife generators make can middle part insulation one section, that middle part insulation two-stage nitration and middle part are incubated the temperature of three sections is relatively independent, require to finely control the temperature of each heat preservation zone according to alloying, intercept " stack effect " further, it is prevented effectively from heat loss, it is ensured that realize the annealing process of " after first high temperature low temperature ".
Further, described zone temperature sensor is arranged on the middle part sidewall of middle part insulation one section, middle part insulation two-stage nitration and middle part insulation three sections.So, the real time temperature of each zone temperature sensor energy accurate acquisition correspondence marker space, and temperature is transferred to middle control PLC processor, and controls resistance heater by middle control PLC processor and seal the operating power of air knife generator, it is ensured that strip steel carries out heat treatment in the temperature set.
Further, it is provided with turnover plate type sealing baffle between outlet and the import of top cooling section of described middle part soaking zone.Turnover plate type sealing baffle can reduce cooling section and soaking zone gaseous exchange, it is prevented that heat is emitted to top cooling section, reduces the cooling load of top cooling section, extends the service life of cooling section equipment.
Yet further, the exit of described middle part soaking zone is additionally provided with outlet temperature sensor, and the signal output part of described outlet temperature sensor also electrically connects with the input of middle control PLC processor, in order to control the outlet heat dissipation to top cooling section.Specifically, middle control PLC processor controls the folding of turnover plate type sealing baffle according to the temperature signal that outlet temperature sensor transmits, and is led away by too much heat, alleviates the impact on top cooling section, and then improves the quality of alloying product.
The operation principle of the present invention is such that being incubated for middle part for one section, middle part insulation two-stage nitration and middle part insulation three sections, every section of soak zones is all the heating space cell of a relatively independent control, utilizes respective sealing air knife generator to separate and cuts off " stack effect " impact on heat.When middle part be incubated one section of temperature too high time, zone temperature sensor read-around ratio relatively after, middle control PLC processor 7 reduces the corresponding winding-up intensity sealing air knife generator, makes more heat enter in middle part insulation two-stage nitration；Reduce the power of corresponding resistor heater simultaneously, make the temperature stabilization of middle part insulation one section.In like manner, middle part insulation two-stage nitration and middle part are incubated three sections and also can judge heating power according to the temperature value that corresponding zone temperature sensor reads and seal the winding-up intensity of air knife generator, make the temperature of three marker spaces be effectively controlled.
It is an advantage of the current invention that: designed sealing air knife generator can be incubated the exit of a section, middle part insulation two-stage nitration and middle part insulation three sections and form reliable and stable partition air screen at middle part, efficiently solve soaking zone heat problem uneven, easily appearance " stack effect " up and down in the middle part of alloying furnace, the temperature and pressure in middle part soaking zone gateway, internal zone territory can be realized stable, the heat dissipation of soaking zone is greatly reduced, it is ensured that heat concentrates in each marker space.Simultaneously, can according to process conditions requirement, coordinated by zone temperature sensor, middle control PLC processor, resistance heater and sealing air knife generator, segmentation accurately controls the holding temperature of different marker space, realize the segmentation precise controlling of alloying temperature, it is thus achieved that best " after first high temperature low temperature " annealing treating process., the heat of middle part soaking zone is controlled meanwhile, stabilize the technological requirement of middle part soaking zone on the one hand, reduce the cooling load of rear operation on the other hand, protect follow-up equipment.
Accompanying drawing explanation
Fig. 1 is the hot-dip galvanized steel strip segmentation essence control formula alloying furnace of the present invention layout orientation schematic diagram on galvanization production line.
Fig. 2 is the refined structure schematic diagram of alloying furnace shown in Fig. 1.
In figure: bottom-heated section 1, middle part soaking zone 2 (wherein: middle part is incubated one section 2.1, middle part insulation two-stage nitration 2.2, middle part insulation three section 2.3), top cooling section 3, seal air knife generator 4, resistance heater 5, zone temperature sensor 6, middle control PLC processor 7, outlet temperature sensor 8, induction heater 9, strip steel 10, turnover plate type sealing baffle 11, furnace top roller 12, zinc pot 13, sinking roller 14, air knife 15, high temperature air screen Q.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, the hot-dip galvanized steel strip segmentation essence control formula alloying furnace of the present invention is arranged between the zinc pot 13 on galvanization production line and furnace top roller 12, strip steel 10 is drawn from the sinking roller 14 in zinc pot 13, galvanized layer thickness is controlled through air knife 15, enter heat treatment in alloying furnace, finally export around furnace top roller 12.
As in figure 2 it is shown, this alloying furnace is mainly combined by bottom-heated section 1, middle part soaking zone 2 and top cooling section 3.Wherein, in bottom-heated section 1, it is provided with induction heater 9, for strip steel 10 is quickly heated up to design temperature.Middle part soaking zone 2 is in integral cavity structure, it is incubated one section 2.1 by middle part from bottom to top, middle part is incubated two-stage nitration 2.2 and middle part insulation is tightly connected for three section 2.3 and forms, and middle part insulation one section 2.1, middle part insulation two-stage nitration 2.2 and middle part are evenly equipped with resistance heater 5 in being incubated three section 2.3 respectively.The exit being incubated three section 2.3 at middle part insulation one section 2.1, middle part insulation two-stage nitration 2.2 and middle part is respectively arranged with a set of sealing air knife generator 4, and a pair nozzle of each set sealing air knife generator 4 is perpendicular to two sides of strip steel 10 and arranges in opposite directions.So, the three road high temperature air screen Q being perpendicular to its conveying direction can be formed during its work in the two sides of strip steel 10, form three marker spaces.
Being each provided with a zone temperature sensor 6 in high temperature air screen Q three marker spaces formed, three zone temperature sensor 6 are separately mounted to middle part insulation one section 2.1, middle part insulation two-stage nitration 2.2 and middle part and are incubated on the middle part sidewall of three section 2.3.The signal output part of each zone temperature sensor 6 all electrically connects with the input of same middle control PLC processor 7, and the end that controls of middle control PLC processor 7 then electrically connects with the resistance heater 5 in each marker space and corresponding sealing air knife generator 4 respectively.
Between the outlet and the import of top cooling section 3 of middle part soaking zone 2, it is provided with turnover plate type sealing baffle 11, is used for preventing heat to be emitted to top cooling section 3.The space passed through for strip steel 10 is left in the middle of turnover plate type sealing baffle 11.
It is additionally provided with outlet temperature sensor 8 in the exit (namely middle part is incubated the exit of three section 2.3) of middle part soaking zone 2, the signal output part of outlet temperature sensor 8 also electrically connects with the input of middle control PLC processor 7, the end that controls of middle control PLC processor 7 electrically connects with the driving mechanism of turnover plate type sealing baffle 11, the folding of turnover plate type sealing baffle 11 can be controlled, in order to control the outlet heat dissipation to top cooling section 3 according to the temperature value received from outlet temperature sensor 8.
The technical process of above-mentioned hot-dip galvanized steel strip segmentation essence control formula alloying furnace is as follows:
1) strip steel 10 drawn from zinc pot 13 processes through air knife 15, is delivered to the bottom-heated section 1 of alloying furnace, and heating and temperature control is at 520～560 DEG C, it is desirable to controlling at 530～550 DEG C, heat time heating time is 5～8s.
2) then strip steel 10 is delivered up the middle part soaking zone 2 to alloying furnace, strip steel 10 is incubated one section 2.1 along middle part successively, middle part is incubated two-stage nitration 2.2 and middle part is incubated three section 2.3 and moves upward, controlling holding temperature is 500～550 DEG C, being preferably controlled in 520～550 DEG C, temperature retention time is 10～15s；Meanwhile, seal air knife generator 4 in the relative jet in strip steel 10 two sides, make the exit that middle part insulation one section 2.1, middle part insulation two-stage nitration 2.2 are incubated three section 2.3 with middle part respectively formed together be perpendicular to the high temperature air screen Q of strip steel 10 conveying direction.The jet velocity of high temperature air screen Q controls at 20～60m/s, it is desirable to control at 30～50m/s, and air screen temperature controls at 400～600 DEG C, it is desirable to control at 490～550 DEG C.As such, it is possible to heat to be collected in Discrete control in middle part insulation one section 2.1, middle part insulation two-stage nitration 2.2 and middle part are incubated three section 2.3, intercept " stack effect " in the soaking zone 2 of middle part.And, it is arranged on middle part insulation one section 2.1, middle part insulation two-stage nitration 2.2 and middle part to be incubated the zone temperature sensor 6 of three section 2.3 and transmit the real-time temperature values of each compartmented respectively to middle control PLC processor 7, middle control PLC processor 7 controls corresponding resistance heater 5 further according to the temperature value obtained and seals the operating power of air knife generator 4, so that the temperature stabilization of each compartmented is at 500～550 DEG C.And the outlet temperature sensor 8 being arranged on soaking zone 2 exit, middle part also transmits Outlet Temperature value to middle control PLC processor 7 in real time, middle control PLC processor 7 controls the folding of turnover plate type sealing baffle 11 according to Outlet Temperature value, the heat that can effectively reduce middle part soaking zone 2 is emitted to top cooling section 3, increase the cooling capacity of top cooling section 3, and extend the service life of cooling device.
3) strip steel 10 finally continues up the top cooling section 3 being delivered to alloying furnace, and controlling outlet temperature is 280～320 DEG C.
Claims (7)
1. a hot-dip galvanized steel strip segmentation essence control formula Technology for Heating Processing, it is that the strip steel (10) of output from zinc pot (13) is sequentially carried out heating, insulation, cooling online, finally realize the process with steel alloying, it is characterised in that: it comprises the steps:
1) strip steel (10) processed through galvanizing is first delivered to the bottom-heated section (1) of alloying furnace, and controlling heating-up temperature is 520～560 DEG C, and heat time heating time is 5～8s；
2) strip steel (10) being then delivered up the middle part soaking zone (2) to alloying furnace, controlling holding temperature is 500～550 DEG C, and temperature retention time is 10～15s；Meanwhile, by the mode in the relative jet in strip steel (10) two sides, make in middle part soaking zone (2), to form multiple tracks and be perpendicular to the high temperature air screen (Q) of strip steel (10) conveying direction, and the temperature signal in each marker space formed by high temperature air screen (Q) transmits in time to middle control PLC processor (7), control PLC processor (7) is made to control the jet velocity of high temperature air screen (Q) in each marker space in real time, air screen temperature, and the power of resistance heater (5), thus the holding temperature accurately controlled in each marker space, intercept the stack effect in middle part soaking zone (2)；The jet velocity of high temperature air screen (Q) is 20～60m/s, and air screen temperature is 400～600 DEG C；
3) strip steel (10) finally continues up the top cooling section (3) being delivered to alloying furnace, and controlling outlet temperature is 280～320 DEG C.
2. hot-dip galvanized steel strip segmentation essence control formula Technology for Heating Processing according to claim 1, it is characterised in that: described step 1) in, controlling heating-up temperature is 530～550 DEG C；Described step 2) in, controlling holding temperature is 520～550 DEG C.
3. hot-dip galvanized steel strip segmentation essence control formula Technology for Heating Processing according to claim 1 and 2, it is characterised in that: described step 2) in, the jet velocity of high temperature air screen (Q) is 30～50m/s, and air screen temperature is 490～550 DEG C.
4. the hot-dip galvanized steel strip segmentation essence control formula alloying furnace designed for realizing technique described in claim 1, including bottom-heated section (1), middle part soaking zone (2) and top cooling section (3), it is provided with induction heater (9) in described bottom-heated section (1), resistance heater (5) it is provided with in described middle part soaking zone (2), it is characterised in that:
Described middle part soaking zone (2) is in integral cavity structure, it is arranged at intervals with many sets and seals air knife generator (4), a pair nozzle of described sealing air knife generator (4) is perpendicular to two sides of strip steel (10) and arranges in opposite directions, can form the high temperature air screen (Q) being perpendicular to its conveying direction during work in the two sides of strip steel (10)；
Each marker space that described high temperature air screen (Q) is formed is provided with zone temperature sensor (6), the signal output part of described zone temperature sensor (6) all electrically connects with the input of same middle control PLC processor (7), the end that controls of described middle control PLC processor (7) then electrically connects with the resistance heater (5) in each marker space and corresponding sealing air knife generator (4) respectively, thus the holding temperature accurately controlled in each marker space；
Described middle part soaking zone (2) is incubated one section (2.1), middle part insulation two-stage nitration (2.2) and middle part insulation three sections (2.3) by middle part from bottom to top and is tightly connected and forms, described sealing air knife generator (4) is provided with three sets, it is arranged in the exit at middle part insulation one section (2.1), middle part insulation two-stage nitration (2.2) and middle part insulation three sections (2.3), thus forming three marker spaces.
5. hot-dip galvanized steel strip segmentation essence control formula alloying furnace according to claim 4, it is characterised in that: described zone temperature sensor (6) is arranged on the middle part sidewall at middle part insulation one section (2.1), middle part insulation two-stage nitration (2.2) and middle part insulation three sections (2.3).
6. the hot-dip galvanized steel strip segmentation essence control formula alloying furnace according to claim 4 or 5, it is characterised in that: it is provided with turnover plate type sealing baffle (11) between outlet and the import of top cooling section (3) at described middle part soaking zone (2).
7. hot-dip galvanized steel strip segmentation essence control formula alloying furnace according to claim 6, it is characterized in that: the exit at described middle part soaking zone (2) is additionally provided with outlet temperature sensor (8), the signal output part of described outlet temperature sensor (8) also electrically connects with the input of middle control PLC processor (7), in order to control the outlet heat dissipation to top cooling section (3).
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| CN104846185A (en) * | 2015-04-21 | 2015-08-19 | 武汉钢铁(集团)公司 | Alloying furnace holding-section atmoseal furnace temperature compensation device |
| CN104805389B (en) * | 2015-05-18 | 2017-11-24 | 武汉钢铁有限公司 | The Technology for Heating Processing and its device that strip is shaken in alloying furnace can be suppressed |
| CN105177486B (en) * | 2015-09-28 | 2017-11-03 | 本钢板材股份有限公司 | A kind of continuous galvanizing line alloying furnace soaking time adjusting method |
| CN106957950A (en) * | 2016-01-08 | 2017-07-18 | 宝山钢铁股份有限公司 | Hot-dip galvanized alloy soaking pit and strip hot-dip galvanizing system |
| CN106967942A (en) * | 2016-01-13 | 2017-07-21 | 宝山钢铁股份有限公司 | Indirect heating type hot blast is incubated alloying soaking pit and with steel alloying galvanizing system |
| CN106893971B (en) * | 2017-04-20 | 2023-08-11 | 华能国际电力股份有限公司 | Online alloying method and device for metal pipeline surface |
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| CN110174914A (en) * | 2019-06-24 | 2019-08-27 | 马钢(合肥)板材有限责任公司 | The method of aluminium-plated powder effect is improved in a kind of thermostatic control device and aluminium silicon household electrical appliances board production technology |
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Effective date of registration: 20170724 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |