CN1219206A - Steel band heat-treating apparatus by gas jet stream - Google Patents
Steel band heat-treating apparatus by gas jet stream Download PDFInfo
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- CN1219206A CN1219206A CN98800275A CN98800275A CN1219206A CN 1219206 A CN1219206 A CN 1219206A CN 98800275 A CN98800275 A CN 98800275A CN 98800275 A CN98800275 A CN 98800275A CN 1219206 A CN1219206 A CN 1219206A
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- steel band
- nozzle
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/613—Gases; Liquefied or solidified normally gaseous material
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
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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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
Abstract
A heat-treating apparatus for heating, cooling or drying a steel band by blowing a jet streams of a gas to the steel band, including a resistance body provided at the distal end of a nozzle for jetting a gas jet stream in such a manner that the projection area of the resistance body is not more than 3 to 12 % of the sectional area of the nozzle, or a resistance plate provided at the distal end of a nozzle for jetting a gas jet stream in such a manner that the projection sectional area of the resistance plate is less than 3 % of the sectional area of the nozzle and the plate length in a nozzle axial direction inside the nozzle is at least 50 % of the nozzle diameter.
Description
The present invention relates to a kind of by steel band being sprayed the thermal treatment unit of air-flow with heating, cooling or dry steel band.
Now existing a kind of by steel band being sprayed the Conventional Heat Treatment device of air-flow with heating or cooling steel band.But, since in this Conventional Heat Treatment device using gas as heat-conduction medium, so its thermal conductivity α is low.Therefore, differing with the Conventional Heat Treatment device obtains sufficiently high operation usefulness surely, does not have to satisfy the heated at high speed or the requirement of high speed refrigerative that must reach from the metallurgy viewpoint.For example, the inventor has proposed a kind of disclosed by steel band ejection air-flow is made steel band refrigerative refrigerating unit in the patent announcement No.2-16375 that Japan has examined.In the device of this cooling steel band, the scope of setting thermal conductivity α is α≤400 kilocalorie/m
2H ℃.Be under the situation of above-mentioned scope in heat biography rate, when thickness of strips is 0.6mm, might obtain the speed of cooling of 100 ℃/s, still, when thickness of strips was 1.0mm, in fact speed of cooling can only reach 60 ℃/s.Therefore, if will reach higher thermal conductivity, will adopt the roller method of cooling, in this method, water-cooled roller is closely contacted with steel band, perhaps, also can adopt the air-water method of cooling, in this method, G﹠W mixes mutually, with this mixture cooling steel band.Yet above-mentioned roller method of cooling has shortcoming, and roller is contacted with the steel band solid, and this is difficult to accomplish that the water cooling roller contacts equably with steel band, thereby steel band is cooled off equably, and causes strip deformation.On the other hand, above-mentioned air-water method of cooling also has shortcoming, promptly owing to will use water in this method, the decomposition oxygen that steel strip surface is subject to contain in the water and oxidation, therefore, if adopt this air-water method of cooling, just must after finishing thermal treatment, steel band carry out cleanup acid treatment to steel band again.
Above-mentioned this in order to improve by steel band being sprayed the thermal conductivity of air-flow with the thermal treatment unit of heating or cooling steel band.Preferably improve the speed that is sprayed onto the air-flow on the steel band.Find according to the test that the inventor carries out, this thermal conductivity can roughly improve with the airflow rate that is sprayed onto steel band with being directly proportional, still, and along with the raising of gas velocity, the ducted pressure-losses also enlarges markedly, and this just must be provided with the thermal conductivity that jumbo gas blower obtains to be scheduled to.
The objective of the invention is, keep above-mentioned pass through to have high rate of heating or speed of cooling to steel band ejection air-flow and to the device that steel band is heat-treated in, reduce the required quantity of power of this device.
To achieve these goals, of the present invention have following (1)～(a 10) described feature to steel band ejection air-flow to the device that steel band is heat-treated:
(1) a kind of thermal treatment unit, by steel band ejection air-flow is heat-treated steel band with heating, cooling or dry steel band, the baffle post that comprises end before a kind of nozzle that is fixed on the ejection air-flow, wherein, this baffle post and shadow area be defined as the nozzle throat area long-pending 3～12%.
(2) a kind of thermal treatment unit, by steel band ejection air-flow is heat-treated steel band with heating, cooling or dry steel band, comprise a kind of flow-stopping plate of holding before the nozzle of ejection air-flow that is fixed on, wherein the shadow area of this flow-stopping plate be defined as less than the nozzle throat area long-pending 3%, its length along nozzle axis is defined as being not less than 50% of nozzle diameter.
(3) a kind of thermal treatment unit by steel band ejection air-flow is heat-treated steel band with heating, cooling or dry steel band, comprising: a plurality of nozzles; A plurality ofly be used for fixing a plurality of nozzles and to the jet base of nozzle air feed; With a gas distributor that is used for dispensing a gas onto a plurality of jet bases, wherein between above-mentioned jet base, be provided with opening or space as venting port, the area of this opening is 5～17 times of jet hole area.
(4) pass through the thermal treatment unit that the ejection air-flow is heat-treated steel band according to above-mentioned (3), it is characterized in that, described nozzle is a kind of nozzle that end stretches out before the jet base.
(5) according to above-mentioned (3) the thermal treatment unit that the ejection air-flow is heat-treated steel band that passes through, it is characterized in that stretching out of said nozzle highly is not more than 5 times of nozzle inside diameter.
(6) according to above-mentioned (3) the thermal treatment unit that the ejection air-flow is heat-treated steel band that passes through, it is characterized in that the shape of end is tapered along the mode that the direction that sprays air-flow reduces gradually according to the gas passage cross section before the above-mentioned jet base.Before the said nozzle end not before the jet base end face stretch out.
(7) a kind of thermal treatment unit, by steel band ejection air-flow is heat-treated steel band with heating, cooling or dry steel band, it is characterized in that, be defined as being not more than 70mm from steel band to spray nozzle front end apart from Z, and satisfy following inequality: W/4≤h, in the formula, h is the height that nozzle stretches out from the jet base to the nozzle air feed, mm, W are gas flow or the gas flow density that is sprayed on the unit surface, m
3/ minm
2
(8) a kind of thermal treatment unit, by the thermal treatment unit that steel band ejection air-flow is heat-treated steel band with heating, cooling or dry steel band, it is characterized in that, in the jet space of the nozzle that the ejection air-flow is installed, be provided with one and support roll alternately arranged with the roller that prevents the steel band vibration by rule at interval along the steel band direct of travel insert the space; And inserting the nozzle that the ejection air-flow is set in the space with the roller that the support roll of steel band is inserted the relative side of side.
(9) a kind of thermal treatment unit, by steel band ejection air-flow is heat-treated steel band with heating, cooling or dry steel band, it is characterized in that, being provided with one in the jet space of the nozzle that the ejection air-flow is installed alternately arranges support roll at interval with the roller that prevents the steel band vibration by rule along the steel band direct of travel and to insert the space, under the situation of cooling steel band, above-mentioned support roll is cooled, and under the situation of heating or dry steel band, above-mentioned support roll is heated.
(10) a kind of thermal treatment unit, by to steel band circulation and ejection non-oxidizing gas steel band being cooled off in air-flow and steel band being heat-treated, it is characterized in that the outlet side at the pneumatic plant of gas blower and so on is provided with a heat exchanger that is used for cooling gas at least.Fig. 1 is the graph of relation between gas flow density and the thermal conductivity, and the trial stretch that the present invention carries out also is shown among the figure;
Fig. 1 is the graph of relation between gas flow density and the thermal conductivity, and the trial stretch that the present invention carries out also is shown among the figure;
Fig. 2 (a), 2 (b), 2 (c) and 2 (d) illustrate the view of the various nozzles in the thermal treatment unit of steel band being heat-treated by the ejection air-flow of the present invention respectively;
Fig. 3 (a) and 3 (b) illustrate the state of the air-flow of spray nozzle front end respectively;
Fig. 4 is the thermal conduction characteristic graphic representation of various nozzles;
Fig. 5 is the graph of relation between the thermal conductivity of long-pending ratio in the shadow area of baffle post and nozzle throat area and nozzle below medium position;
Fig. 6 is the ratio of flow-stopping plate length and nozzle diameter and the graph of relation between the medium position thermal conductivity of nozzle below;
Fig. 7 illustrates the position relation of nozzle and steel band;
Fig. 8 (a) and 8 (b) illustrate common nozzle respectively;
Fig. 9 illustrates an example of thermal treatment unit of the present invention, wherein is provided with deflated opening rearwards;
Figure 10 (a), 10 (b) and 10 (c) illustrate the example of the nozzle arrangement of thermal treatment unit of the present invention respectively;
Figure 11 is port area S1 in a kind of thermal treatment unit of steel band being heat-treated by the ejection air-flow and the graph of a relation between the jet hole area S2;
Figure 12 is the graph of relation between the ratio of the ratio of a kind of port area of thermal treatment unit of steel band being heat-treated by the ejection air-flow and jet hole area and thermal conductivity;
Figure 13 (a) and 13 (b) are illustrated in the gas flow situation in a kind of thermal treatment unit of steel band being heat-treated by the ejection air-flow respectively;
Figure 14 is illustrated in a kind of thermal treatment unit of steel band being heat-treated by the ejection air-flow, forms a part of upstream between cooling jet;
Figure 15 (a) and 15 (b) illustrate the structure around the nozzle of a kind of thermal treatment unit of steel band being heat-treated by the ejection air-flow of the present invention respectively;
Figure 16 is illustrated in that nozzle stretches out the influence curve of the comparison thermal conductivity of height h and nozzle inside diameter D in a kind of thermal treatment unit of steel band being heat-treated by the ejection air-flow;
Figure 17 is illustrated in a kind of thermal treatment unit of steel band being heat-treated by the ejection air-flow and does not establish the jet base of opening and the relation between the nozzle;
Figure 18 is illustrated in the thermal treatment unit of steel band being heat-treated by the ejection air-flow when changing nozzle and stretch out highly h, the relation curve between the ratio of gas flow density and thermal conductivity;
Figure 19 is illustrated in a kind of common arranging situation that passes through support roll and air jet system in the thermal treatment unit that the ejection air-flow heat-treats steel band;
Figure 20 is illustrated in the arranging situation of support roll and air jet system in a kind of thermal treatment unit of steel band being heat-treated by the ejection air-flow of the present invention;
Figure 21 is the sectional view of the move forward and backward mechanism and the heating and cooling mechanism of the support roll in a kind of thermal treatment unit of steel band being heat-treated by the ejection air-flow;
Figure 22 (a) is at a kind of figure that is provided with by the common heat exchangers in ejection air-flow the thermal treatment unit that steel band is heat-treated;
Figure 22 (b) be in the thermal treatment unit that ejection air-flow of the present invention is heat-treated steel band heat exchanger figure is set;
Figure 23 is the graph of relation between the ratio of blower power when cooling off steel band in a kind of thermal treatment unit of steel band being heat-treated by the ejection air-flow and the temperature that sprays gas.
Describe the present invention below in detail.In this respect, the inventor had studied various situations to solve the above problems.In the present invention, solved problem, be illustrated below successively from the preparation of nozzle, the discharge of gas, effective jet length ratio and jet temperature direction.
At first consider the preparation of nozzle.In order to determine best nozzle diameter and injector spacing, carried out various tests, and test-results has been compared mutually.The result shows that nozzle diameter and the injector spacing by the bulletin No.2-16375 of Japan's unexamined patent regulation that are proposed by the inventor are the most effective, also are like this even improve gas velocity.Fig. 1 illustrates trial stretch that the present invention does and the Japan trial stretch done of unexamined patent No.2-16375.As can be seen from Figure 1, the relation between gas flow density and the thermal conductivity is on the straight line among the figure, though in thermal conductivity less than 400 kilocalories/m
2In h ℃ the scope, if also be like this under the situation that the discharge of gas does not go wrong.
The dead point that air-flow is occurred when colliding object can reduce thermal conductivity, and therefore, it is the effective means of raising from the thermal conductivity of the gas of nozzle ejection that people know the disturbance that promotes on this dead point.For example, shown in Fig. 8 (a) and 8 (b), in the open disclosed a kind of structure of No.61-40155 of the utility model of Japanese unexamined, in nozzle 1, be provided with flow-stopping plate 3 or spiral-line 6, to facilitate a kind of turbulent flow.
But for the intersection flow-stopping plate 3 described in the open No.61-40155 of the utility model that above-mentioned Japanese unexamined is installed, nozzle length is lengthened to be enough to two or three flow-stopping plates are installed in the nozzle.Therefore, be difficult to the nozzle that has this structure in industrial a large amount of manufacturings.If pack spiral-line 6 in above-mentioned nozzle, gas will stir and spray by centrifugal force.Therefore, this structure neither be effective.
As previously mentioned, low at the strength of turbulence at the center of air-flow, therefore,, must increase the strength of turbulence at air-flow center in order to improve thermal conductivity effectively.According to the present invention, see the turbulent means that add the blast air center that can drop into application easily as a kind of viewpoint from industry, the inventor proposes a kind of like this structure: as shown in Figure 2, baffle post 2 or flow-stopping plate 3 are installed in the central authorities of nozzle 1 front end.Owing to adopt above-mentioned nozzle arrangements,, shown in Fig. 3 (a) and 3 (b), in this turbulent flow, form row's eddy current in the back of baffle post 2 or flow-stopping plate 3 just form turbulent flow 5.Therefore, might form turbulent flow at the central area of air-flow 4.In this respect, the cross section of baffle post 2 is not limited to circle, but can make polygon or other shapes.
The second, the inventor has studied the method for discharging from the gas of nozzle ejection.As previously mentioned, in order to improve thermal conductivity, can improve the flow velocity that is sprayed onto the gas on the steel band.In other words, can improve the airshed that is sprayed onto on the steel band.But, fast inadequately if gas is discharged, just the gas that is sprayed onto on the steel band rests on the steel strip surface, and disturb with the gas that newly is sprayed onto on the steel band.As a result, thermal conductivity can not obviously improve.On the curve of Fig. 1, solid line is represented gas discharge example in shape, and dotted line is represented the bad example of gas discharge.When the discharge outofkilter of gas, be higher than in the scope of preset value in the density of air flow quantity, the increase of thermal conductivity has been slowed down.For above-mentioned reasons, in order to improve thermal conductivity effectively, more crucial is successfully to discharge the gas that is sprayed onto on the steel band.In order to address the above problem, the inventor finds following two kinds of ways.
Studied the air-flow after the collision of gas and steel band, found that: from the air-flow and the steel band collision of nozzle ejection, and along the surface flow of steel band, the air-flow with the adjacent nozzle ejection collides then, and then, the direction that breaks away from steel band along gas is mobile.This upstream that occurs between nozzle occurs in the part of the hatching of Figure 14.The flow velocity of this upstream be nozzle 1 ejection air-flow flow velocity 20～40%.
Therefore, according to the present invention, an opening portion or a space of discharging gas is set, it is enough big that its area is wanted, so that form a kind of upstream of discharge after the airflow collision that the air-flow and the adjacent nozzle of nozzle ejection sprays.For this, Figure 11 illustrates the relation between opening portion area S1 and the nozzle bore area S2.
Shown in Figure 13 (a), after the air-flow of nozzle 1 ejection and steel band 7 collisions, just flow on steel band 7, the air-flow with the adjacent nozzle ejection collides then, and upwards rises.Shown in Figure 13 (a), this upwelling is not having broad ways under the force ventilated situation to flow to the end of steel band, and therefore, this upstream can not be discharged fully, but refluxes on the surface of jet base 8, and mixes with the air-flow of nozzle 1 ejection.As a result, when steel band must cool off, raise from the temperature of the air-flow of nozzle 1 ejection, and when steel band must heat, the temperature of this air-flow then reduced.Therefore, heating that can not obtain being scheduled to or refrigerative usefulness.Because gas rests between steel band 7 and the jet base 8, the flow velocity of lamelliform air-flow on the steel band 7 is reduced.Therefore, the cooling power around the collision part of the air-flow that nozzle 1 sprays descends.
In device of the present invention, between jet base 8, be provided with an opening portion 10, shown in Figure 13 (b).Above-mentioned upstream flows in this opening portion 10.Therefore, be sprayed onto the surface of steel band from the air-flow of nozzle 1 ejection, and the influence of the upstream that is seldom refluxed.Like this, just, can cool off or heat steel band effectively.Owing to there is not gas to stop between steel band 7 and jet base 8, gas can successfully flow along steel band 7, therefore, can slow down the reduction of gas heating or cooling power.
Figure 15 illustrates the embodiment of the nozzles surrounding structure of thermal treatment unit of the present invention.Shown in Figure 15 (a), nozzle 1 is a kind of nozzle that stretches out, and its front end more protrudes than the fore-end of jet base 8, therefore, when gas when opening portion 10 is discharged, can prevent that a part of air-flow of nozzle 1 ejection from just directly not discharging with steel band 7 collisions.In Figure 15 (b) illustrated embodiment, though the front end of nozzle 1 be positioned at jet base 8 before on the sustained height of end face,, the shape of the leading section of jet base 8 diminishes gradually, in other words, the air flue cross-sectional area along air flow line reduces gradually.Therefore, the deflated inlet part reduces gradually between the jet base 8.Like this, the part that just can guarantee the exhaust passage of area minimum is the opening portion of the sort of situation shown in Figure 15 (a), also just can obtain and the same effect of structure shown in Figure 15 (a).
Second kind of method for exhausting of discharging gas smoothly will be described below.According to first kind of method for exhausting, gas is discharged into the nozzle back by the opening portion between the jet base.But the shortcoming of first kind of method for exhausting is that jet base is separated into a plurality of parts by the space of opening portion.Therefore, though first kind of method for exhausting is the ideal method, it is provided with cost and has improved.Therefore,, removed the opening portion that is communicated with the nozzle rear side, and made nozzle stretch out suitable stretching out highly according to second kind of method for exhausting.In other words,, just can eliminate and spray the interference of gas, and not have the gas that stops when guaranteeing that nozzle shown in Figure 17 stretches out height during h, because the space of emission gases does not form in the back of nozzle, but along the direction formation that is parallel to steel band.Above-mentioned method is proposed among the unexamined patent No.2-16375 in Japan by the inventor.According to above-mentioned Japan unexamined patent No.2-16375, regulation from steel band to spray nozzle front end apart from Z for being not more than 70mm, and the regulation nozzle stretch out highly that h is not less than (100-Z) mm.But as previously mentioned, above-mentioned value is that the estimated range in the hypothesis thermal conductivity is α≤400 kilocalorie/m
2Determine under h ℃ the prerequisite.This time the scope that then thermal conductivity is higher than above-mentioned value is tested, and find following situation: along with the increase of gas flow, it is not enough that nozzle stretches out the qualification that height h is not less than (100-Z) mm, unless estimated value is added the gas flow density w (m of a unit surface
3/ minm
2), otherwise just can not formulate suitable estimation benchmark.In other words, the inventor finds that from physical viewpoint, important problem is to determine the space of emission gases according to the amount that will spray into gas.
So the inventor tests, in this test, change nozzle and stretch out height, and make the steel band cooling of heating, thus the relation between the ratio of discovery gas flow density and thermal conductivity.The ratio of the thermal conductivity when in the case, definite thermal conductivity being benchmark value is defined as the ratio of thermal conductivity.Figure 18 illustrates above-mentioned relation.According to Figure 18, when nozzle stretched out highly for 200mm, the ratio of thermal conductivity roughly increased pro rata with the increase of gas flow density.When nozzle stretch out height hour, the increase of thermal conductivity ratio just is suppressed from a certain gas flow density value, and take place that ejection gas stops and with new ejection gas interferential situation.This stretches out highly little and the low density scope Nei Gengyi generation of gas flow at nozzle.Obtain following expression from above-mentioned relation:
In W/4≤h formula: W is gas flow density (m
3/ minm
2); H is that required nozzle stretches out height (mm).
In this respect, about gas flow density W, to calculate by the gas flow density of maximum certainly, so that show the repertoire of apparatus of the present invention effectively.Stretch out height as for nozzle, can find the minimum height that stretches out by above-mentioned basis.But, stretch out height h if unnecessarily increase, will increase the pressure-losses in the nozzle, and improve the manufacturing cost of device.Therefore, preferably select essential minimum to stretch out height.
The 3rd, the inventor has studied the ratio of effective jet length.Usually, under the refrigerative situation, speed of cooling be defined as Δ t/T (℃/sec), wherein, Δ t (℃) be that cooling temperature is poor, T (sec) be the cooling required time.Under heating state, rate of heating is defined as the such form of speed of cooling in the same way.From metallurgical viewpoint, speed of cooling and rate of heating all are important.In order to improve speed of cooling and rate of heating.The inventor designs a kind of equipment.In by the ejection air-flow thermal treatment unit of heat-treating, in order to improve rate of heating or speed of cooling, just reduce the spacing between nozzle and steel band, so that prevent the reducing of gas flow rate of nozzle ejection as much as possible.Therefore,, support roll 16,17 is set contacts (as shown in figure 19) with steel band 7, like this, just can correct the warpage and the vibration of steel band, and can reduce the spacing between nozzle 1 and the steel band 7 by certain interval for warpage and the vibration that suppresses steel band.
But in order to operate, above-mentioned support roll 16,17 places will be provided with roller bearing device 18,19 respectively, so that support roll 16,17 can forward and be stepped back in operation process.Owing to foregoing reason, must support roll be set in device and insert the space, and gas can not be sprayed in these spaces, in other words, from heat treated viewpoint, above-mentioned support roll is inserted the space and is become a kind of useless zone.Because these spatial exist, heating and cooling speed partly reduces, and from metallurgical viewpoint, this is disadvantageous.Importantly, improve average rate of heating or average cooling rate on the metallurgy.In order to improve this two values, improve jet spatial efficient and be effectively, reducing support roll as much as possible, to insert the space also be effective.
In Figure 19, with the length of the gas of reality ejection and jet beginning extremely the ratio of the length L 1 of jet end be defined as effective jet length ratio.To the continuous annealer of steel band continuous annealing generally speaking, effective jet length ratio is about 80%.In order to improve above-mentioned environment, the inventor has studied even has heated in support roll is inserted the space or the refrigerative method.Support roll shown in Figure 19 is inserted the space and is divided into both sides, Yi Bian be the side that roller inserts, the other side is a side that roller be not set relative with steel band.If when the side that roller is not set is provided with the extension 22 (seeing Figure 20) of an air jet system, just this side can be changed into jet zone.One side of roller is being set, is being provided with one and can makes roller 16,17 forward and the roller bearing device that retreats.Therefore, be difficult to be provided with air jet system in this side.Even air jet system is set, also be difficult to make air jet system near steel band in this side.Therefore reduced efficient.So the inventor has designed the device of a kind of heating or cooling support roller itself, so that carry out the heating of roller or the cooling of roller.For above-mentioned reasons, can make usually for heating and cooling is that the support roll in useless zone is inserted the space and become very little, and, even in roller is inserted the space, also can heat or cool off.Since above-mentioned, average heating or refrigerative speed just can be improved.
The 4th, the inventor has studied the best jet temperature under the situation of cooling steel band.Generally speaking, when jet temperature reduces, tend to reduce the required power of gas blower.But, if jet temperature is reduced to when being lower than preset value, in order to reduce jet temperature, will reduce cooling agent in the heat exchanger and jet between temperature head.Therefore, though the pressure-losses in the heat exchanger increases, jet temperature does not reduce so much.As a result, the gas blower power demand increases on the contrary.The inventor studied the problem of jet temperature in great detail, found that following situation.Only jet temperature is that of gas blower power demand minimum is approximately 60 ℃～200 ℃.The inventor finds that also above-mentioned that fluctuates along with the temperature of thermal conductivity, thermal treatment unit ingress temperature of steel strips, thermal treatment unit exit temperature of steel strips and the used cooling agent of heat exchanger.The inventor has also studied the high scope of thermal conductivity in great detail.Result of study is found, in the high scope of thermal conductivity, compares with the scope that general thermal conductivity is low, and its only point is shifted to low jet temperature on one side, and jet temperature remarkably influenced gas blower power demand (as shown in figure 23).
Therefore, the inventor has studied and has reduced jet method of temperature effectively.Make in the steel band refrigerative thermal treatment unit a kind of, when using a kind of non-oxidizing gas circulation and being sprayed on the steel band, use a kind of water to come cooling gas usually as the heat exchanger of cooling agent.Consider that from the viewpoint that prevents the gas blower heating heat exchanger operated by rotary motion in the case, in order to reduce jet temperature, can increase the capacity of heat exchanger at the inlet side of gas blower.But, if the temperature head of cooling agent and inter gas reduces, will reduce heat exchanger effectiveness, and when gas flows, will increase the pressure-losses in heat exchanger.Yet no matter whether the pressure-losses increases, and jet temperature does not reduce.As a result, as shown in figure 23, when jet temperature reduces when too many, the gas blower power demand has increased on the contrary.Therefore, the inventor's target is, improves jet temperature under the situation that adopts gas blower increase whiff pressure.According to this point, the inventor designs a kind of device that heat exchanger is arranged on the gas blower outgoing side, in other words, not a plurality of heat exchangers to be installed at the inlet side of gas blower, and a plurality of heat exchangers are installed at the outgoing side of gas blower, for above-mentioned reasons, just can increase the temperature head between gas and cooling agent, thereby can improve the efficient of heat exchange.After adopting above-mentioned device,, also can obtain same jet temperature with the blower power that is lower than common unit even under the situation of same thermal conductivity (α).Particularly when thereby the pressure that further increases gas blower can improve the efflux velocity that is sprayed onto on the steel band, effect was more remarkable, because the gas temperature of gas blower has significantly improved.
Example
Several examples are described below successively.First, the following describes a kind of flow-stopping plate that is fixed on the nozzle, study the thermal conduction characteristic of the single nozzle shown in Fig. 2 (a) and 2 (b), fixed a baffle post 2 on the single nozzle shown in Fig. 2 (a), fixed a flow-stopping plate 3 on the single nozzle shown in Fig. 2 (b).In the case, use air as a kind of refrigerant.The setting nozzle diameter is 10.5mm; From the air velocity of nozzle ejection is 150m/s; From spray nozzle front end to the distance between the object to be cooled is 50mm.
Nozzle characteristic when having studied steel plate under the cooling down high-temperature of nozzle that its front end is fixed with above-mentioned baffle post.Result of study is shown in Fig. 4, and as can be seen from Figure, thermal conductivity increases on the mid-way below the nozzle center.
About the baffle post, be illustrated in the shadow area of baffle post under the above-mentioned cooling conditions and the ratio of the cross-sectional area of nozzle at Fig. 5.As can be seen, if the long-pending ratio in the shadow area of baffle post and nozzle throat area is not less than 3%, just can obtain to improve the effect of thermal conductivity.When the long-pending ratio in the shadow area of baffle post and nozzle throat area greater than 12% the time increase because the pressure-losses of the spray nozzle front end that the baffle post causes is installed, therefore should increase the gas blower power demand.So the long-pending ratio in the shadow area of baffle post and nozzle throat area is uneconomic greater than 12% structure.For the above reasons, the long-pending ratio in the shadow area of determining the baffle post and nozzle throat area is 3～12%.
In like manner, about flow-stopping plate (its thickness less than the nozzle throat area long-pending 3%), studied the length of flow-stopping plate along the nozzle axial direction due.Result of study shows, when the length of flow-stopping plate is not less than nozzle diameter 50%, can improve thermal conductivity.About the thickness of flow-stopping plate, when this thickness is not less than 3% since above-mentioned along nozzle shaft to flow-stopping plate length, make the jet pressure-losses bigger, so in order to reduce the gas blower power demand, the thickness that preferably makes flow-stopping plate is less than 3% than above-mentioned baffle post.
The second, the following describes the method for exhausting example of discharge from the gas of the smooth ejection of nozzle.Fig. 9 is the sectional view of thermal treatment unit of the present invention.A plurality of nozzles 1 that stretch out facing to the steel band 7 that moves along the direction of arrow are installed.7 ejection air-flows are heat-treated steel band 7 from this nozzle 1 towards steel band.In the case, when ejection gas was heated, this thermal treatment unit was as heating unit, and when ejection gas was cooled, this thermal treatment unit was as refrigerating unit.In order to prevent the steel band oxidation, in many cases, make thermal chamber be full of hydrogen and nitrogen blended nonoxidizing atmosphere.But,, also can obtain same effect even when for example air is as gas.Many arrows among Fig. 9 are represented air-flow.
From gas blower 9 air feed continuously.By a kind of gas distributor (not shown) gas is sent into jet base 8 separately then, also with the air-flow of steel band 7 collisions the heat of steel band 7 has been taken away from nozzle 1 ejection.Air-flow returns then, and discharges from opening 10.In other words, gas is discharged to the rear side with respect to steel band 7 of nozzle 1.Expellant gas is sent into gas blower 9 once more by air-breathing base 11.Make gas boosting by this gas blower 9, and then enter circulation.
Though not shown at Fig. 9, as to be provided with a kind of heating or cooling gas device in the front or the back of gas blower 9.In device shown in Figure 9, have only gas to enter circulation again by air-breathing base 11 by opening 10, still, air-breathing base 11 also can be set and from a part of draw gas of thermal chamber.In the case, collide, only under the effect of the power of the upwelling of the air-flow formation of returning, pass through opening portion then from air-flow and the steel band of each nozzle 1 ejection.In Fig. 9, the cross section of jet base 8 is orthogonal, and still, for easily manufactured, the cross section of jet base 8 also can be circular, oval-shaped or polygonal, and perhaps, the cross section of jet base 8 can be a kind of compound shape.
Figure 10 is the view that nozzle 1 and jet base 8 arranged, on one side this looks this view from steel band 7.Shown in Figure 10 (a), nozzle 1 can be arranged by zigzag system.And, shown in Figure 10 (b), organize nozzle 1 more and can arrange by zigzag system, wherein, every group of nozzle 1 contains 3～7 row's nozzles 1.If for each row's nozzle is provided with a jet base 8, just the cost of device improves.But, shown in Figure 10 (c), when a jet base 8 being set, just can reduce the number of opening 10 for a few row's nozzles.In the case, gas might be able to not be discharged fully, therefore, must regulate the height that stretches out of nozzle according to the area of opening portion.
When using the thermal treatment unit of the present invention shown in Fig. 9 and 10, thickness is that nitrogen and the hydrogen blended air-flow as refrigerant that the steel band 7 of 1.0mm is ejected cools off it.In the case, to stretch out height setting be 20mm to cooling jet.The ratio of the thermal conductivity when Figure 12 is illustrated in the ratio of the area that changes opening portion under the condition of constant blower power and nozzle opening area.Table 1 illustrates parameters such as nozzle diameter, injector spacing.The curve negotiating of Figure 12 is estimated the ability of cooling steel band along the evenly heat conductivity of width of steel band direction.Comparative example shown in the figure is the result of 0,3.4 and 17.3 each points at the ratio of the area of opening portion 10 and nozzle opening area.In the case, when the area ratio is 0, all opening portion 10 sealings.The result of this example shown in the figure be in from the ratio of opening portion area and nozzle opening area be 5.8 point to the ratio of opening portion area and nozzle opening area be in the scope of 15.7 point.From area than be 5 point to area than being that the ratio of the thermal conductivity of this example is higher than the ratio of the thermal conductivity of comparative example in the scope of 17 point.In other words, when the ratio of opening portion area and nozzle opening area was 5～17, the ability of the air-flow cooling steel band by ejection improved.
Table 1
| ?No | Nozzle to steel band apart from Z (mm) | Nozzle diameter (internal diameter) D (mm) | Injector spacing (mm) | The ratio of opening portion area and nozzle opening area | |
| Comparative example | ?1 | ????50 | ????9.4 | ????50 | ????0 |
| ?2 | ????50 | ????9.4 | ????25 | ????3.6 | |
| Example of the present invention | ?3 | ????50 | ????10.5 | ????25 | ????5.8 |
| ?4 | ????50 | ????9.4 | ????25 | ????7.2 | |
| ?5 | ????50 | ????12.7 | ????50 | ????7.9 | |
| ?6 | ????50 | ????10.5 | ????50 | ????11-6 | |
| ?7 | ????50 | ????9.4 | ????50 | ????14.4 | |
| ?8 | ????50 | ????7.8 | ????25 | ????15.7 | |
| Comparative example | ?9 | ????50 | ????10.5 | ????50 | ????17.3 |
The height h that stretches out of nozzle 1 preferably is not more than 5 times of nozzle inside diameter D.Reason is, the ratio of thermal conductivity obviously reduces (as shown in figure 16) when the stretching out height h and surpass 5 times of nozzle inside diameter D of nozzle 1.It is believed that the reason that the ratio of above-mentioned thermal conductivity obviously reduces is, when nozzle stretches out when highly big, gas flow rate just obviously reduces before upstream arrives opening portion between the jet base 8, has become difficulty thereby gas is discharged.
The following describes an opening portion that jet base is not set and nozzle is stretched out height h and be defined in the example of discharging gas under the situation of a desired value.This example is shown in Figure 17.In this structure, opening is not set between the nozzle 1, jet base 8 is made box-like jet base, the nozzle of certain number is set therein.In this respect, about between spray nozzle front end and the steel band 7 apart from Z, as Japan unexamined patent No.2-16375 is disclosed, stipulate that this is not more than 70mm apart from the Z value.
Referring to Figure 17 gas stream 14 is described below.One air-flow with steel band 7 collisions, flows along steel band 7 after nozzle 1 ejection then.In a short period of time, the air-flow of this air-flow and adjacent nozzles ejection collides.Therefore, this air-flow that is to say that along flowing in the opposite direction with the side of nozzle ejection air-flow the direction towards jet base 8 flows this air-flow from steel band 7.Then, this air-flow and jet base collision and mobile along jet base.In a short period of time, this air communication cross one between jet base 8 and steel band 7 the zone and discharge.At this moment, if gas flow density is low, just in stretching out height h zone, nozzle flows along jet base airflow flowing.But if the flux density of gas increases, aforementioned region is just big inadequately, so, and in steel band the air-flow inflow steel band 7 and the zone between nozzle 1 front end that collides.In the case, colliding once air-flow with steel band just is involved in the air-flow of nozzle ejection.For example, when steel band cools off, be what cool off from the air-flow of nozzle ejection, still, when being involved in the air-flow that nozzle sprays with the high temperature gas flow of steel band collision, the temperature of the air-flow that collides with steel band just raises, thereby reduces its cooling efficiency.In this respect, about jet base, be not less than a preset value if determine the height h that stretches out of nozzle, just can successfully discharge gas.But, jet base suitably can be separated, so that between the jet base that separates, form the space, make gas pass through this space and discharge.Particularly when the width of steel band big, when perhaps jet base length longitudinally is big, that is to say that it was effective that jet base is separated when the size of jet base was big.
The 3rd, the following describes the example of the ratio that improves effective jet length.Figure 19 illustrates the thermal treatment unit that common employing ejection air-flow is heat-treated.In this device, make steel band 7 and nozzle 1 close to each other, thereby can improve the efficient of air-flow.In order to prevent that nozzle from contacting with steel band when steel band vibration or the warpage, alternately pressing steel band by left support roll 16 and right support roll 17.But, insert space 23 and right support roll at left support roll and insert space 24 and do not spray into gas.Therefore, though in the scope of L1, cool off or heat,, in the L1 scope, comprising the nonuseable part that does not cool off or heat, the result can not obtain the high cooling or the efficient of heating.That is to say that common thermal treatment unit is in the little state of the ratio of effective jet length.
Referring to Figure 20 example of the present invention is described below.In device shown in Figure 20, an air jet system extension 22 is being set with the relative side of support roll of steel band 7.Owing to adopt this structure, just shorten from beginning jet position to the length L 2 that finishes jet position.The actual jet length of Figure 19 is identical with the actual jet length of Figure 20, and still, length L 1 is compared with length L 2, and length L 2 in other words, has increased the ratio of effective jet length less than length L 1.In the case, heat or cool off the required time and shortened (L1-L2)/V second, in the formula, V (m/s) is the translational speed of steel band 7.About heating or rate of cooling, might improve heating or cooling efficiency according to the method described above.In this respect, if apply the present invention in the actual continuous annealer of continuous annealing steel band, the ratio of its effective jet length just brings up to 90% from 82%.
As previously mentioned, when heating or cooling support roller, can improve heating or refrigerative ability, thereby further improve heating or refrigerative speed.But, as previously mentioned, support roll directly contact with steel band with heat or the refrigerative thermal treatment unit in, owing to being difficult to make support roll to contact equably usually, so just there is the uneven shortcoming of temperature of steel strips in this thermal treatment unit with steel band.But, according to the test that the inventor did, the diameter of support roll is not more than 300mm usually, in other words, the diameter of support roll generally is little, so the surface pressure of support roll is higher than and is generally used for heating or the refrigerative diameter is the surface pressure of the roller of 1000mm, surface pressure described here is exactly that steel band is pressed in pressure on the roller.Therefore, can not think can cause heating or when cooling the uneven temperature problem.
Figure 21 illustrates the sectional view of right support roll part.In this respect, because the structure of left support roll part is identical with right support roll part, so at the right support roll of this explanation.In this example, support roll is a kind of water chill rolls.As shown in figure 21, right support roll 17 is arranged between the two side of thermal treatment locular wall 13, and by supporting rotationally at the bearing 26 of sidewall upper edge wiping action.In the case, jet base and nozzle are positioned in the space on steel band 7 left sides (for simplicity, not shown jet base and nozzle), and the end that the right support roll of tube-in-tube structure is made in inside is connected with the motor 27 that support roll is rotated.On the other hand, the bearing 26 that is installed in a relative side has a rotating connector, and this web member is connected with vent pipe 29 with water-supply pipe 28, and in the case, bearing 26 is mounted to and can slides.Therefore, can bearing 26 be moved forward and backward, so that support roll is moved by power delivery axle 31 and divider 32 by a motor.
Adopt said structure, can by water-supply pipe 28 to the right support roll 17 infeed water coolant, and waste water is discharged by vent pipe 29.Here, support roll is as the refrigerative roller, still, if adopt the fluid of heating, also can be with support roll as warming mill.Even under the refrigerative situation, also can be with other fluids water not.And, under the situation of heating, also can be without fluid, but to the support roll power supply, so support roll can be used as a kind of electric heating roller.Can infeed fluidic temperature or amount or control heating or refrigerative ability by control by the electric current of control feed roller.
The 4th, the following describes the example that reduces jet temperature effectively.Figure 22 (a) illustrates and a kind ofly common enter circulation and be sprayed on the example that makes steel band refrigerative thermal treatment unit on the steel band with non-oxide air-flow with non-oxidized gas.In Figure 22 (a), label 7 expressions steel band to be cooled.Cool off in the non-oxidized gas (not shown) of this steel band 7 in thermal treatment locular wall 13.Label 9 is a kind of gas blowers that are used to draw and spray into the non-oxidized gas in the thermal chamber.Middle part at pipeline 34, a heat exchanger 35 that is used for cooling gas is installed, by gas blower 9 superchargings, so the gas of supercharging is introduced once more in the thermal chamber and by jet base 8 and nozzle 1 by pipeline 34 and is sprayed onto on the steel band 7, and steel band 7 is cooled off fast by heat exchanger 35 refrigerative gases.About the position of heat exchanger 35, according to common structure, so that protect gas blower 9 to make it not to be heated, Cai the gas in thermal chamber is drawn by gas blower 9 after by heat exchanger cooling.In other words, heat exchanger is installed in the inlet side of gas blower.In the Conventional Heat Treatment device, the scope of the thermal conductivity of estimation cooling steel band is little, so the flow velocity of nozzle-end is not high.Therefore, gas blower does not need high supercharging, and the rising of gas temperature is few in gas blower.For above-mentioned reasons, do not have problem in actual applications.But, when the cooling steel band will improve thermal conductivity, the just essential flow velocity that improves nozzle-end, and require gas blower that high supercharging is arranged.Therefore, the temperature that causes in the very important pressurization raises.As a result, when only heat exchanger 35 (seeing Figure 22 (b)) being installed also in the back of gas blower 9, cooling efficiency could be improved, in other words, when the outlet side of gas blower 9 is also installed heat exchanger 35, cooling efficiency can be improved.In other words, if when setting the reduction amount of surrounding gas temperature and being steady state value, can make the capacity of the capacity of the heat exchanger of structure shown in Figure 22 (b) less than the heat exchanger of structure shown in Figure 22 (a).As a result, reduced the pressure-losses in the heat exchanger, and can make the capacity of gas blower littler.In this connection, in structure shown in Figure 22 (b), heat exchanger all is installed in the gas blower front and back.But, if consider gas blower, not have any problem from heat-stable viewpoint, also can uneasy assembling heat exchanger in the blower inlet side, and only heat exchanger is installed in the blower export side.
Industrial application
According to the present invention, by steel band ejection air-flow is heated, cools off or the annealing device of dry steel band in, can improve pyroconductivity by the turbulent flow that promotes air-flow central authorities, also can successfully discharge the gas that is sprayed onto on the steel band, and can prevent described Exhaust Gas and newly be sprayed onto interfering with each other of gas on the steel band. For above-mentioned reasons, can improve pyroconductivity.
According to the present invention, by steel band ejection air-flow is heated, in the annealing device of cooling or dry steel band, can shorten the length of inserting the useless running section in the space of left and right backing roll, that is to say, can shorten the length that steel band is not produced the section of heating, cooling or drying, therefore, can reduce the total length of annealing device. For above-mentioned reasons, the time of heating, cooling or dry steel band can be reduced, thereby the efficiency of heating surface, cooling effectiveness or the drying efficiency of heating, cooling or dry steel band can be improved. And the heat exchanger that refrigerating gas is used is installed in the outlet side of compressor (for example air blast), therefore, can effectively reduce the temperature of ejection air-flow, and the result can improve cooling effectiveness, and reduces the required power of compressor (for example air blast).
Therefore, desired heating or cooling velocity on the metallurgy viewpoint can guarantee obtained in the situation of the air blast that excess capacity is not set or conduit, and, length that can the shortening heat treating apparatus, therefore, can make device do compactly, and make the power level of its air blast be starkly lower than the power level of the air blast of common unit. Therefore, consider from the viewpoint that reduces operating cost, can produce large benefit. And, according to cooling system of the present invention, steel band be the problem of non-uniform temperature can not appear and can not occur that profile is damaged and the situation of surface oxidation problem under cool off, and the problems referred to above in common pyroconductivity α 〉=400 kilocalorie/m2To occur when carrying out the roller cooling in h ℃ the cooling system. Therefore, the present invention can improve the quality of steel band, and need not to arrange the acid dip pickle of scale removal, thereby has simplified equipment.
Claims (10)
1. thermal treatment unit, by steel band ejection air-flow is heat-treated steel band with heating, cooling or dry steel band, the baffle post that comprises end before a kind of nozzle that is fixed on the ejection air-flow, wherein, this baffle post and shadow area be defined as the nozzle throat area long-pending 3～12%.
2. thermal treatment unit, by steel band ejection air-flow is heat-treated steel band with heating, cooling or dry steel band, comprise a kind of flow-stopping plate of holding before the nozzle of ejection air-flow that is fixed on, wherein the shadow area of this flow-stopping plate be defined as less than the nozzle throat area long-pending 3%, its length along nozzle axis is defined as being not less than 50% of nozzle diameter.
3. a thermal treatment unit by steel band ejection air-flow is heat-treated steel band with heating, cooling or dry steel band, comprising: a plurality of nozzles; A plurality ofly be used for fixing a plurality of nozzles and to the jet base of nozzle air feed; With a gas distributor that is used for dispensing a gas onto a plurality of jet bases, wherein between above-mentioned jet base, be provided with opening or space as venting port, the area of this opening is 5～17 times of jet hole area.
According to claim 3 pass through ejection air-flow thermal treatment unit that steel band is heat-treated, it is characterized in that described nozzle is a kind of nozzle that end stretches out before the jet base.
5. according to the thermal treatment unit that the ejection air-flow is heat-treated steel band that passes through of claim 3, it is characterized in that stretching out of said nozzle highly is not more than 5 times of nozzle inside diameter.
6. according to the thermal treatment unit that the ejection air-flow is heat-treated steel band that passes through of claim 3, it is characterized in that the shape of end is tapered along the mode that the direction that sprays air-flow reduces gradually according to the gas passage cross section before the above-mentioned jet base.Before the said nozzle end not before the jet base end face stretch out.
7. thermal treatment unit, by steel band ejection air-flow is heat-treated steel band with heating, cooling or dry steel band, it is characterized in that, be defined as being not more than 70mm from steel band to spray nozzle front end apart from Z, and satisfy following inequality: W/4≤h, in the formula, h is the height that nozzle stretches out from the jet base to the nozzle air feed, mm, W are gas flow or the gas flow density that is sprayed on the unit surface, m
3/ minm
2
8. thermal treatment unit, by the thermal treatment unit that steel band ejection air-flow is heat-treated steel band with heating, cooling or dry steel band, it is characterized in that, in the jet space of the nozzle that the ejection air-flow is installed, be provided with one and support roll alternately arranged with the roller that prevents the steel band vibration by rule at interval along the steel band direct of travel insert the space; And inserting the nozzle that the ejection air-flow is set in the space with the roller that the support roll of steel band is inserted the relative side of side.
9. thermal treatment unit, by steel band ejection air-flow is heat-treated steel band with heating, cooling or dry steel band, it is characterized in that, being provided with one in the jet space of the nozzle that the ejection air-flow is installed alternately arranges support roll at interval with the roller that prevents the steel band vibration by rule along the steel band direct of travel and to insert the space, under the situation of cooling steel band, above-mentioned support roll is cooled, and under the situation of heating or dry steel band, above-mentioned support roll is heated.
10. thermal treatment unit, by to steel band circulation and ejection non-oxidizing gas steel band being cooled off in air-flow and steel band being heat-treated, it is characterized in that the outlet side at the pneumatic plant of gas blower and so on is provided with a heat exchanger that is used for cooling gas at least.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP82247/97 | 1997-03-14 | ||
| JP8224797 | 1997-03-14 | ||
| JP16664497 | 1997-06-10 | ||
| JP166644/97 | 1997-06-10 | ||
| JP177815/97 | 1997-06-19 | ||
| JP17781597 | 1997-06-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1219206A true CN1219206A (en) | 1999-06-09 |
| CN1083896C CN1083896C (en) | 2002-05-01 |
Family
ID=27303851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98800275A Expired - Lifetime CN1083896C (en) | 1997-03-14 | 1998-03-13 | Steel band heat-treating apparatus by gas jet stream |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0911418B1 (en) |
| KR (1) | KR100293139B1 (en) |
| CN (1) | CN1083896C (en) |
| BR (1) | BR9804782A (en) |
| DE (1) | DE69833424T2 (en) |
| TW (1) | TW404982B (en) |
| WO (1) | WO1998041661A1 (en) |
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| CN107922984A (en) * | 2015-05-29 | 2018-04-17 | 奥钢联钢铁有限责任公司 | Method and its device for the uniform contactless cooling on the non-endless surface of heat |
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| FR2925919B1 (en) * | 2007-12-28 | 2010-06-11 | Cmi Thermline Services | DEVICE FOR BLOWING GAS ON A FACE OF A THREADED STRIP MATERIAL |
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| CN106282877B (en) * | 2016-08-29 | 2018-11-09 | 首钢京唐钢铁联合有限责任公司 | Galvanizing annealing furnace band steel enters pot temperature control method |
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| WO2019097711A1 (en) * | 2017-11-20 | 2019-05-23 | Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 | Cooling device for metal plates and continuous heat treatment equipment for metal plates |
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- 1998-03-13 EP EP98907225A patent/EP0911418B1/en not_active Expired - Lifetime
- 1998-03-13 TW TW087103745A patent/TW404982B/en not_active IP Right Cessation
- 1998-03-13 CN CN98800275A patent/CN1083896C/en not_active Expired - Lifetime
- 1998-03-13 KR KR1019980709182A patent/KR100293139B1/en not_active IP Right Cessation
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| CN108148956A (en) * | 2016-12-02 | 2018-06-12 | 宝山钢铁股份有限公司 | A kind of jumbo jet heating equipment of continuous annealing unit |
| CN108148956B (en) * | 2016-12-02 | 2019-10-25 | 宝山钢铁股份有限公司 | A kind of jumbo jet heating equipment of continuous annealing unit |
| CN111363910A (en) * | 2020-03-03 | 2020-07-03 | 首钢京唐钢铁联合有限责任公司 | Pulse type burner heating output control method and system |
| CN111363910B (en) * | 2020-03-03 | 2021-11-19 | 首钢京唐钢铁联合有限责任公司 | Pulse type burner heating output control method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0911418A1 (en) | 1999-04-28 |
| KR20000011032A (en) | 2000-02-25 |
| BR9804782A (en) | 1999-08-17 |
| DE69833424T2 (en) | 2006-10-26 |
| CN1083896C (en) | 2002-05-01 |
| EP0911418A4 (en) | 2004-03-24 |
| WO1998041661A1 (en) | 1998-09-24 |
| KR100293139B1 (en) | 2001-06-15 |
| DE69833424D1 (en) | 2006-04-20 |
| TW404982B (en) | 2000-09-11 |
| EP0911418B1 (en) | 2006-02-08 |
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