CN101545032B - Method for realizing evenly cooling of strip steel - Google Patents
Method for realizing evenly cooling of strip steel Download PDFInfo
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- CN101545032B CN101545032B CN2008100350279A CN200810035027A CN101545032B CN 101545032 B CN101545032 B CN 101545032B CN 2008100350279 A CN2008100350279 A CN 2008100350279A CN 200810035027 A CN200810035027 A CN 200810035027A CN 101545032 B CN101545032 B CN 101545032B
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Abstract
The invention discloses a method for realizing evenly cooling of strip steel. The method comprises the following steps that: a water soluble polymer or a copolymer with drag reduction property is added into cooling water, the concentration is 0.02 to 0.5 percent, and the molecular weight is more than 200 millions. Compared with the prior art, the method has the advantages that by adding the polymer in jet flow, the pressure of the jet flow is stronger, and the stability is more stable, so that the vapor film can be effectively and evenly eliminated; and the vapor film is made to be quickly thinned and disappears, thereby reducing the generation of an oxide film and improving the cooling speed.
Description
Technical field
The present invention relates to the Water Cooling Technology of cold-rolled steel strip continuous annealing, belong to the steel plate that is immersed in the water-cooled process in the water especially, by water coolant and the mixing jet that contains additive, to eliminate the eddy current on water jet border, improve the speed and the stability of water jet, thereby the mixed rapidly and uniformly jet of steam film of belt steel surface is destroyed.
Background technology
The core of continuous annealing development is the development of cooling technology.According to the method for cooling difference after the soaking, the method for cooling of having developed at present has: gas injection cooling (GJC), high-speed gas injection cooling (HGJC), water cooling (WQ), roll-type cooling (RC), air-water cooling (AcC), hot water cooling (HOWAC), high speed hydrogen injection cooling (H
2-HGJC), water-cooled+roller cold (WQ+RC), roller be cold+gas injection cooling (RC+GJC) compound cooling or the like.Wherein water-cooled is that fastest a kind of wet type type of cooling is moved back by the company of being applied to so far.The characteristics of Water Cooling Technology are that speed of cooling is fast, do not need to add in addition alloying element and can produce high-strength steel.Obtain the intensity that quenched martensite improves the band steel, rate of cooling that need be very high (＞200 ℃/s), other method of cooling is difficult to realize.
In the water-cooled process, the band steel of temperature up to 700 ~ 850 ℃ immerses water-cooling groove, cooling can be divided into three phases: belt steel temperature is called the film boiling stage from cooling beginning between 300 ℃, is called the nucleate boiling stage between 300 ℃-100 ℃, is lower than 100 ℃ and is the convection current cooling stages.In the film boiling stage, form steam film between water and the belt steel surface, the effect of steam film is equivalent to thermal resistance, hindered the heat exchange of liquid and metallic surface, cause cooling power to reduce, moreover, the inhomogeneous meeting of steam film causes the belt steel surface inhomogeneous cooling even, can not guarantee good planeness and unified hardness.Simultaneously, steam film is one of reason that forms oxide film attached to belt steel surface, because oxide film has a strong impact on surface quality, must set up pickling process equipment on production line, increases initial cost cost and production run cost.Therefore eliminate steam film, not only can improve speed of cooling, improve plate shape, the generation of all right inhibited oxidation film improves surface quality.
Usually, typical method is to arrange nozzle in water, the water jet of the certain pressure by being immersed in the nozzle ejection in the water.This effusive effect is to the belt steel surface water spray, at refrigerative film boiling stage destruction steam film in cooling zone steel process.Jet will reach the minimum velocity of destroying film boiling, must guarantee to spray to the band steel with certain pressure, jet causes the instability of jet speed easily in the fluctuation that can form jet boundary in the process of external diffusion, at this moment, shower can't evenly impact and (promptly can't break steam film equably) on the strip width direction and influenced the refrigerative homogeneity.In order to make the jet boundary fluctuation as much as possible little, prolonging effusive core area length then needs bigger jet pressure.Therefore, the control of flow velocity is to realize that the band steel evenly cools off, and guarantees the key of plate shape.Arrive the jet speed of belt steel surface and the distance of nozzle and belt steel surface and be inversely proportional to, size is usually between 0-10m/s.As shown in Figure 1, water cooling plant synoptic diagram temperature be that 700 ~ 850 ℃ band steel 1 is dipped into water by sinking roller 2 is to realize cooling fast, the draining and the water inlet of the Monitoring and Controlling water circulation system of the temperature T in the tank in the recirculated cooling water groove 3 of heat-eliminating medium.Arrange that in the strip width direction series of spray nozzles 4 injection water jets are in order to destroy the steam film that produces in the film boiling stage, with the circulation of temperature T control nozzle water medium.The water of injection stream and cooling trough provides by tank 5.Cooling trough also has other water inlet pipe 10 and water shoot 11. Variable valve 6,7,12,13 among the figure, pump 8, guide roller 9.Under the non-additive situation of injection stream, water column is in turbulent state and produces the eddy current of many rotations on the border and resolve into more micro cyclones, produces the viscous loss of jet energy, and effective range is shortened, and has reduced jet speed and stability.
By the reasonable Arrangement and the structure Design thereof of nozzle, steam film is eliminated at each position that makes the jet water column as far as possible evenly impact the band steel in several patents of having announced.For example patent WO83/00881 is a kind of method of destroying the belt steel surface steam film by structure of nozzle variation and the formed jet of layout; US4052235 destroys steam film by the high pressure spray nozzle jet, and the effectively generation of inhibited oxidation film; JP2003286517 is that a kind of combining by vibration and injection stream strengthened the method that coolant flow is destroyed steam film.The common issue with of these methods is: the fluctuation that can not solve jet water column injection back itself causes surface cool inhomogeneous down to formation temperature difference on the strip width direction.
People have taked the other scheme to manage to eliminate steam film.The existing described method of patent that suppresses or eliminate steam film that relates in the Water Cooling Technology has:
Patent JP5069029 is that a kind of mode by the increase of the nozzle both sides in cooling fluid electric field is accelerated the steam film fragmentation, the method that the reinforcement metal parts conduct heat.The electric field that this mode provides is 100-2000V.
Patent JP4013808 is the heat treating method that a kind of ultrasonic vibration that adds 8-600KHz in water is destroyed steam film.This method has been strengthened speed of cooling, and the hardness of band steel is improved.
Patent US20070175549 is a kind of method elimination steam film that steam film is applied change pressure repeatedly, the method that realizes comprises vibration to cooling fluid, changes methods such as liquid level pressure, swing part, and in the destroyed back of steam film cooling fluid is stirred.
There are limitation in technique device complexity, performance difficulty that the various steam films of being realized in the above patent suppress or eliminate, lack versatility.
Summary of the invention
For remedying the deficiencies in the prior art, the technical problem to be solved in the present invention provides the even refrigerative method of a kind of realization band steel, it can eliminate the vortex phenomenon of jet boundary, make injection stream stable and be ejected into belt steel surface equably, can effectively destroy steam film, make the cooling of band steel evenly, energy inhibited oxidation film improves strip shape quality.
Technical conceive of the present invention is as follows: under the non-additive situation of injection stream, water column is in turbulent state and produces the eddy current of many rotations on the border and resolve into more micro cyclones, produce the viscous loss of jet energy, effective range is shortened, reduced jet speed and stability.In the film boiling stage in process of cooling, by arranging series of spray nozzles on the strip width direction, water coolant mixes with additive and forms mixing jet and spray to belt steel surface from each nozzle and destroy steam film with this.Nozzle arrangements can be the nozzle of porous or slit or various special shapes.Mixing jet sprays to belt steel surface with certain speed breaks steam film, evenly the cooling zone steel.
Additive described in the present invention is water-soluble polymers or the multipolymer that possesses resistance reducing performance, the eddy current that jet boundary behind the mixed polymer produces reduces, have satisfactory stability and speed, can realize that at the stable in a lateral direction jet of belt steel surface steam film eliminates uniformly and effectively.
Under the situation of injection stream pbz polymer additive, the molecular chain of high molecular polymer is overlapped on the energy that has suppressed it between the eddy current, effectively sprays distance and speed thereby strengthened jet, can reduce the energy that the external world offers the nozzle water column.Therefore, the effect of described polymeric additive is an eddy velocity of eliminating jet boundary, stablizes jet.Do not need to increase Special Equipment and improve cooling, also need not the original equipment parameter is made amendment, promptly it is that kind of a convenient reliable realization band steel evenly cools off, and improves plate shape, and the method for the generation of energy inhibited oxidation film.
Vertical range is 20mm-200mm between nozzle and the band steel.Along spacing between horizontal two nozzles of band steel is A.Can realize regulating according to strip width spacing A, its effect is to prevent to be with steel to produce the local boiling cooling at width.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows: the even refrigerative method of a kind of realization band steel, in water coolant, add water-soluble polymers or the multipolymer that possesses drag reduction, and concentration is 0.02 ~ 0.5%, molecular weight is higher than 2,000,000.
Described water-soluble polymers or multipolymer be polyoxyethylene, polyacrylamide, natural melon glue, in the Chinese honey locust one or more.
Described water-soluble polymers or multipolymer are polymer polyoxy ethene.
The water jets temperature control of described water coolant is being lower than 60 degree.
Described melting concn 0.05%-0.2%.
The method that adds water-soluble polymers or multipolymer in the described water coolant is that with an aqueous solution case, outfit contains the aqueous solution of additive in the case, mixes with it before water coolant enters cooling trough, regulates melting concn by the aperture of valve.
The present invention only adds the high molecular polymer of lower concentration in injection stream, form stable jet beam.Because the controllability of polymer concentration and follow jet to enter the amount of water-cooling groove less, and the water in the cooling trough constantly circulates, so can not exert an influence to the water-cooled process.Compared with prior art, its beneficial effect is: utilize and to add in jet that polymkeric substance can make the jet pressure of ejection stronger, stability is higher, and can be effectively and evenly eliminate steam film; The steam film attenuation is also buried in oblivion fast, reduced the generation of oxide film, improved speed of cooling.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is existing band steel continuous annealing water cooling plant synoptic diagram.
Fig. 2 is the vortex phenomenon synoptic diagram of water boundaries when not adding polyoxyethylene.
Fig. 3 is the stable state jet synoptic diagram behind the adding polyoxyethylene.
Fig. 4 is the water cooling plant synoptic diagram that the present invention is furnished with the additive water tank.
Among the figure, 1-is with steel, the 2-roller that sinks, 3-cooling trough, 4-nozzle, 5-circulating water channel, the 6-variable valve, 7-variable valve, 8-pump, 9-guide roller, 10-water inlet pipe, 11-water shoot, the 12-variable valve, 13-variable valve, 14-densitometer, 15-controller, 16-aqueous solutions of polymers case, 17-variable valve.
Embodiment
Parameter is determined in the jet:
Concentration 0.02-0.5% and molecular weight 2,000,000:
Add polyoxyethylene in the jet as can be known based on known experimental formula, its stable range L is: L=(1+ α c) L
0α is an empirical constant 2.5 * 10
2, c is the relative mass concentration c of polyoxyethylene in water, must satisfy c≤0.5%.L
0Stable range for the original state water jet.The big more then molecular chain of molecular weight is long more, and the polymkeric substance that is lower than molecular weight 2,000,000 can't effectively play elimination eddy current border and stablize the effusive effect.Figure 2 shows that the vortex phenomenon of water boundaries when not adding polyoxyethylene, and the effect of polyoxyethylated molecular chain elimination eddy current has been described; Figure 3 shows that the stable state jet that adds behind the polyoxyethylene, guarantee jet speed and pressure, thereby improve the ability of breaking steam film.Because the working cycle of water-cooled, additive concentration should be controlled at the low value scope, thereby can ignore the influence to water medium and speed of cooling.
Temperature 60 degree:
Connect the water coolant under the water-cooled requirement use room temperature of moving back.In addition, thereby usually greater than 60 degree polymer molecular chains inefficacy of can rupturing, shorten, so need the control jet temperature.
Preferred concentration 0.05-0.2%: because range is relevant with concentration, in the water-cooled process, the distance of band steel and jet hole is 20-200mm.When getting the preferred value scope, stable range is L=22.5～300mm.Promptly guaranteed the stable pressure of having avoided too high concentration to water cycle again of effusive.
As shown in Figure 4, the water cooling plant of this preparation mixed with polymers aqueous solution water tank.700 ~ 850 ℃ band steel 1 is dipped into by sinking roller 2 and realizes cooling fast in the cooling trough 3 that contains the additive aqueous solution among the figure.Band steel 1 width is arranged a plurality of injection water ejector nozzles 4 that destroy the film boiling steam film; Circulating water channel 5 provides shower cooling water by variable valve 6,7, pump 8, and guide roller 9,10,11 is inlet pipe, drain pipe.The present invention increases an aqueous solutions of polymers case 16, be used for being equipped with in advance and contain the additive aqueous solution, this aqueous solution possesses the water-soluble polymers or the multipolymer of drag reduction, water-soluble polymers or multipolymer are polyoxyethylene (PEO), polyacrylamide (PAM), or in the natural melon glue (Guar Gum), Chinese honey locust one or more.Water-soluble polymers or multipolymer are polymer polyoxy ethene.Preferred concentration is 0.02 ~ 0.5% in the present embodiment, molecular weight is higher than 2,000,000 polyoxyethylene, slowly adds to carry out the constant temperature stirring in the water tank 16, and control water temperature is lower than 60 ℃, can monitor by thermometer, it is dispersed in be prepared into the polyoxyethylene aqueous solution in the water.This aqueous solution offers the pipeline in the jet tank, and water coolant mixes the formation mixing jet with additive through the jet pipeline, sprays to band steel 1 surface from each nozzle 4 and destroys steam film with this.Nozzle 4 structures can be the nozzles of porous or slit or various special shapes.This example is a porous.Flow control valve 17 can be regulated the flow size.The concentration range of polyoxyethylene is controlled at 0.05%-0.2% in the mixing jet.Need not close flow control valve 17 under the situation of additive.There is densitometer 14 to be used to detect the concentration of cooling trough interpolymer, when excessive concentration, opens draining variable valve 13 and discharge the aqueous solutions of polymers of a part, and open into water variable valve 12 water inlets.Variable valve 12 and 13 can be controlled with controller 15.The characteristics of this implementation method: control is simple, is easy to realize the control with steel 1 cooling performance.Under the situation of nozzle 4 jet pbz polymer additives, the molecular chain of high molecular polymer is overlapped on the energy that has suppressed it between the eddy current, effectively sprays distance and speed thereby strengthened jet, can reduce the energy that the external world offers the nozzle water column.Therefore, the effect of described polymeric additive is an eddy velocity of eliminating jet boundary, stablizes jet.Be that kind of a convenient reliable realization band steel evenly cools off, improve plate shape, and the method for the generation of energy inhibited oxidation film.
More than by preferred embodiment the specific embodiment of the present invention has been described; but it should be understood that; here concrete description should not be construed as the qualification to the spirit and scope of the invention; the various modifications that the one of ordinary skilled in the art makes the foregoing description after reading this specification sheets, the scope that all belongs to the present invention and protected.
Claims (5)
1. realize the even refrigerative method of band steel for one kind, it is characterized in that:
Along the strip width direction plurality of nozzles is set, the vertical range between described each nozzle and the band steel is 20-200mm; The film boiling stage in band steel process of cooling, each nozzle sprays mixing jet to belt steel surface, described mixing jet is the mixing jet that water coolant and the water-soluble polymers aqueous solution that possesses drag reduction form, the concentration of the described water-soluble polymers aqueous solution is 0.02～0.5%, and molecular weight is higher than 2,000,000; The temperature of described mixing jet is controlled at and is lower than 60 degrees centigrade.
2. the even refrigerative method of realization band steel as claimed in claim 1 is characterized in that: described water-soluble polymers is polyoxyethylene, polyacrylamide, natural melon glue, in the Chinese honey locust one or more.
3. the even refrigerative method of realization band steel as claimed in claim 1 is characterized in that: described water-soluble polymers is a polymer polyoxy ethene.
4. as claim 2 or the even refrigerative method of 3 described realization band steel, it is characterized in that: the concentration of the described water-soluble polymers aqueous solution is 0.05%-0.2%.
5. the even refrigerative method of realization band steel as claimed in claim 1, it is characterized in that: the method that adds water-soluble polymers in water coolant is, with an aqueous solution case, be equipped with the aqueous solution that contains described water-soluble polymers in the case, before water coolant enters cooling trough, mix, regulate melting concn by the aperture of valve with it.
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| CN2008100350279A CN101545032B (en) | 2008-03-24 | 2008-03-24 | Method for realizing evenly cooling of strip steel |
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| CN2008100350279A CN101545032B (en) | 2008-03-24 | 2008-03-24 | Method for realizing evenly cooling of strip steel |
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| CN101545032B true CN101545032B (en) | 2011-07-20 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1942731C3 (en) * | 1969-08-22 | 1980-04-17 | Sumitomo Electric Industries, Ltd., Osaka (Japan) | Process for improving the cold working properties of rolled steel wire |
| CN1908202A (en) * | 2006-08-17 | 2007-02-07 | 上海嘉仕久企业发展有限公司 | Soaking heat treatment technique for automobile steering knuckle after forging |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1942731C3 (en) * | 1969-08-22 | 1980-04-17 | Sumitomo Electric Industries, Ltd., Osaka (Japan) | Process for improving the cold working properties of rolled steel wire |
| CN1908202A (en) * | 2006-08-17 | 2007-02-07 | 上海嘉仕久企业发展有限公司 | Soaking heat treatment technique for automobile steering knuckle after forging |
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