• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The subject of this invention is a method for controlling the atmosphere in a protective gas chamber (2) for the continuous treatment of metal strips (3). The metal strip (3) is guided via locks (4) in and out of the protective gas chamber (2). At least one lock (4) has at least two sealing elements (5, 6) for the passing metal strip (3), so that a sealing chamber (7) forms between the two sealing elements (5, 6). According to the gas pressure (P2, PD) in the protective gas chamber (2) and in the seal chamber (7) of the lock (4) is measured and the pressure (PD) in the seal chamber (7) regulated in such a way that during operation of the differential pressure (APoicntung) between the protective gas chamber (2) and the sealing chamber (7) is kept as far as possible to an optimum value.
    公开号:AT511034A1
    申请号:T152/2011
    申请日:2011-02-04
    公开日:2012-08-15
    发明作者:Martin Hamman；Jerome Vallee
    申请人:Andritz Tech & Asset Man Gmbh；
    IPC主号:
    专利说明:

    Method for controlling a protective gas atmosphere In a protective gas chamber for treating a metal strip
    The subject of this invention is a method for controlling the atmosphere in a protective gas chamber for the continuous treatment of Metallbändem, wherein the metal strip is guided through locks in and out of the protective gas chamber and wherein at least one of the locks has two or more sealing elements for the passing metal band, so that forms at least one sealing chamber between the sealing elements. In continuous flat type heat treatment furnaces, the tape is protected against oxidation by using a nitrogen-hydrogen reducing atmosphere. Usually, the hydrogen content in the whole furnace is kept below 5%.
    However, the steel industry is also increasingly demanding furnace systems that can be operated with two different inert gas atmospheres. For example, in the production of high-strength steel grades in the rapid cooling section (jet cooling section), a high hydrogen content (15 to 80% H 2) is required and in the remaining furnace section a low hydrogen content (<5% H 2).
    In the production of electric steel, a high hydrogen content (50 to 100%) is required in the warm-up, dip and slow-cooling ranges, and an average hydrogen content (0 to 70% H2) in the remaining furnace area.
    These individual furnace areas must be separated from each other by appropriate locks and in such a way that the metal strip to be treated can pass through the individual furnace areas with the respective gas atmospheres, without causing too much gas to escape through the locks.
    In addition, the furnace must be sealed against the environment and against other aggregates by appropriate locks.
    • ··· • ··· ··· *
    The gas flow between different furnace chambers or between a furnace chamber and the environment is caused by the following factors: a. ) Imbalance of the atmosphere gas flows (inlet / outlet): The amount of gas injected into a certain chamber does not correspond to the amount of gas taken from the same chamber, for which reason the difference flows into the secondary chamber or into the open air. b. ) Convection effect due to the temperature difference between two chambers (in vertical furnaces): The lightest (hottest) gas flows upward and the heaviest (coldest) gas flows down, creating an atmosphere gas cycle in the chambers. c. Expansion or contraction of the atmosphere gas due to temperature fluctuations in the gas: The temperature fluctuations are caused by the process itself (change of the furnace temperature, change of the operating speed of the line, switching on / off of a circulating fan, etc. ...) and are unavoidable. d. ) Belt movement: Due to the viscosity of the gas, the gas also flows in the belt direction in the direction of belt travel. Therefore, a certain amount of gas is carried along with the tape from one chamber to the next.
    At present, primarily two different types of locks are used. On the one hand, single seals are used, which are formed by a pair of metallic sealing rolls, or a pair of sealing flaps, or a combination of a sealing flap and a sealing roll. The metal strip is then fed through the nip / flap gap into the furnace.
    On the other hand, you use double seals with nitrogen injection. This is a double pair of metal sealing rolls or a double pair of flaps, or a double sealing flap-type sealing roll device or a combination of two sealing devices mentioned above, with nitrogen being injected into the space between the two sealing devices. The nitrogen is introduced at a fixed or adjustable by the operator flow rate. There is no automatic regulation of the flow rate in relation to the process parameters. 2
    5005-AT · * ·· m 9 • * · «« · · · · · · · · · · · · · ··· «« «
    Such sealing locks are used, for example, in continuous annealing plants and in continuous galvanizing plants in order to achieve a separation between the furnace atmosphere and the outside area (inlet seals or spout nozzle seal) and between two different combustion chambers. In this case, for example, a combustion chamber with direct firing and the second combustion chamber can be heated by means of jet blasting.
    These gaskets provide satisfactory results when gas flow through the airlock in a particular direction must be avoided, but with relatively high gas flow in the opposite direction.
    For example, the combustion of products of combustion from a direct firing furnace into a blast furnace heated furnace is prohibited, but larger amounts of gas may flow in the opposite direction. Likewise, a discharge of exhaust gases from the directly fired furnace is prohibited to the outside, but a certain air flow from the environment is allowed in the oven. In radiant tube-fired furnace chambers, air ingress should be avoided, allowing a certain amount of shielding gas to exit the furnace into the atmosphere. The same applies to the trunk area when the zinc pot is removed.
    Typically, the gas flow rate between two furnace chambers through conventional gates is in one direction at zero and in the opposite direction in the range of 200 to 1000 Nm3 / h. Such flow rates are only achieved when the pressure in both furnaces can be controlled within a certain tolerance.
    However, if the pressure fluctuates outside of this tolerance in one of the two furnace chambers, the lock is no longer effective.
    The simple seals do not cope satisfactorily with the pressure fluctuations occurring under changing operating conditions. The chemical composition of the atmosphere gas can not be controlled precisely because unavoidable pressure fluctuations in both chambers would cause an alternating atmosphere gas flow in one direction or the other. 3
    5005-AT
    A conventional double seal with injection of a constant amount of nitrogen is also sensitive to the pressure fluctuations in the combustion chambers. The chemical composition of the atmosphere gas in the combustion chambers can not be controlled precisely because the injected nitrogen flows alternately into one chamber, or into the other chamber, or into both chambers, depending on the pressure conditions.
    As a result, these conventional sealing systems do not adequately separate the atmosphere gas and sometimes result in a substantial increase in the atmosphere gas consumption.
    A conventional double seal which ensures good atmospheric separation is described in WO 2008/000945 A1. The weak point of this technology, however, is the high atmospheric gas consumption, which causes higher operating costs and even prohibits its use in furnaces for silicon steel.
    In the case of furnaces for silicon steel, the inlet seal usually consists of a metal seal roller pair and a series of curtains. The atmospheric separation within the furnace is normally through a simple opening in a chamotte wall and the exit seal is either soft coated rolls (hypalon or elastomer) or refractory fibers.
    Such a sealing system has the disadvantage that in the inlet seal a permanent leakage of hydrogen-containing atmosphere gas through the nip (1 to 2 mm) takes place. This gas is constantly burning. The inner seal results in poor separation performance due to the opening size (100 to 150 mm) and the output seal can not be used at high temperature> 200 ° C.
    The object of the invention is to provide a control method for the control of the gas flow through the lock, which ensures a high degree of atmospheric gas separation and reduces the atmospheric gas consumption.
    This object is achieved by a control method in which the gas pressure in at least one protective gas chamber and in the sealing chamber of the lock 4th
    5005-AT is measured and in which the pressure in the sealing chamber is controlled such that in operation the differential pressure (APDicwmg) between the protective gas chamber and the sealing chamber is kept substantially above or below a predetermined value for the critical differential pressure (APoicntung.k) becomes.
    The critical differential pressure (APachtungjO is the value at which the gas flow between the protective gas chamber and the lock reverses.) At the critical differential pressure (APoichtung.k) there should be no gas flow between the protective gas chamber and the seal chamber.The critical differential pressure (APoicfrtung.k) must but do not necessarily have the value zero, although the pressures in the protective gas chamber and in the sealing chamber would be the same size at this value, but it can still lead to a gas flow between these chambers, since the metal belt transported along its surface a certain amount of gas.
    Due to the small volume of the sealing chamber, the pressure in this chamber can be controlled quickly and precisely by injecting or removing a small amount of gas.
    Due to the precise pressure control in the seal chamber, the differential pressure (APoichtung) may preferably be kept close to the value for the critical differential pressure (APoichbjng.k). As a result, the flow rate of the atmosphere gas into or out of the protective gas chamber is reduced to a minimum.
    It is advantageous if the set differential pressure (APnchtung) is kept at a constant distance from the critical differential pressure (APDichtung.k), but the distance should be kept as small as possible.
    Typically, the critical differential pressure (ΔΡοω ™ *. Κ) is between 0 and 100 Pa, and the distance between the set and critical differential pressures is between 5 and 20 Pa.
    This method allows a high separation efficiency of atmospheres between Schutzgaskammem at relatively low Schutegasverbrauch (from 10 to 200 5
    5005-AT «1 · · · · · ·« * * * * «• · * ·· ··· * · · * * • • t ·«
    Nm3 / h). It also allows a good separation of the protective gas chamber from the environment.
    The pressure in the seal chamber can be controlled either by a control valve and a gas supply or by a control valve and a vacuum source. The vacuum source may be, for example, a mammal fan, a fireplace or the environment.
    The inventive method is particularly well suited for NGO silicon steel lines. In such systems, an atmosphere of 95% H2 in a chamber must be separated from an atmosphere of 10% H2 in a second chamber, with hydrogen consumption through the lock being less than 50 Nm3 / h.
    In addition, the process is well suited for rapid cooling in continuous annealing lines or galvanizing lines for carbon steel. Here, an atmosphere with 30 - 80% H2 must be separated from an atmosphere with 5% H2, whereby the hydrogen consumption through the lock should be less than 100 NnrVh.
    With the method according to the invention, the transfer of zinc dust from the trunk into the furnace can also be minimized in galvanizing lines, particularly in installations for zinc-aluminum coating of metal strips.
    In one embodiment of the invention, the lock according to the invention is arranged between the protective gas chamber and a further treatment chamber with a protective gas atmosphere.
    The metal strip can either be passed first through the further treatment chamber and then through the protective gas chamber, or it can first be passed through the protective gas chamber and then through the further treatment chamber. 6
    5005-AT * ···
    It is advantageous if the predetermined value for the critical differential pressure (ÄPcNchtung.k) is calculated via a mathematical model, which preferably takes into account the speed of the metal strip, the gap opening of the two sealing elements, the properties of the protective gas and the thickness of the metal strip
    It makes sense if the optimum gap opening of the two sealing elements is calculated on the basis of the properties of the protective gas and the thickness of the metal strip.
    In the following, the method according to the invention will be described with reference to drawings. Show it:
    1 shows a first variant of the invention with a gas supply system for the sealing chamber.
    Flg. FIG. 2 shows the pressure curve in the chambers for a control method for the first variant according to FIG. 1; FIG.
    3 shows the pressure curve in the chambers for a further control method for the first variant according to FIG. 1;
    4 shows a second variant of the invention in which the sealing chamber is connected to a vacuum system;
    5 shows the pressure curve in the chambers for a control method for the second variant according to FIG. 4; FIG.
    Fig. 6 shows the Druckveriauf in the chambers for a further Regeiverfahren for the second variant of FIG. 4;
    The control method will now be explained with reference to a lock 4 between a secondary chamber 1 (further treatment chamber 1) and a protective gas chamber 2. The same principle applies even if the lock 4 between a 7
    5005-AT
    Protective gas chamber 2 and the outside is located, the outside area is considered as a filled with constant air pressure secondary chamber 1.
    The pressures P and flow rates F shown in the figures are defined as follows: P1 = pressure in the secondary chamber 1 or the external area 1 P2 = pressure in the protective gas chamber 2 Pd = pressure in the sealing chamber 7 APxammer = P2 - P1 (= differential pressure between the Protective gas chamber 2 and the auxiliary chamber 1 and differential pressure between the protective gas chamber 2 and the outer area) APrachtung = Pd - P2 (= differential pressure between the seal chamber 7 and the protective gas chamber 2) APachtung, K - critical differential pressure between the seal chamber 7 and the protective gas chamber 2 = that Differential pressure (Pd - P2) at which the gas flow direction F2 between the shield gas chamber 2 and the seal chamber 7 changes (reverses) F2 = Flow rate of the atmosphere gas between the shield gas chamber 2 and the seal chamber 7 F1 = Flow rate of the atmosphere gas between the seal chamber 7 and the sub chamber 1
    Fd = flow rate of the injected into the seal chamber 7 or derived atmosphere gas in Figure 1, the auxiliary chamber 1 and the protective gas chamber 2 with the intervening lock 4 dargstellt. The lock 4 consists of a first sealing element 5 and of a second sealing element 6, between them is the sealing chamber 7.
    The compositions of the protective gas (N2 content, H ^ Gehait, dew point) in the two chambers 1 and 2 and the respective pressure P1 and P2 in the chambers 1 and 2 are controlled by two separate mixing stations. This control of the mixing stations is done by conventional controls. That the chemical 8
    5005.AT • * ♦ ·
    Composition of the inert gas atmosphere is adjusted by adapting the no. Hr. and the H2H content regulated in the injected atmosphere gas and the pressure control is carried out by adjusting the flow rate of the injected into the chambers 1,2 atmosphere gas. The atmosphere gas is discharged through fixed or adjustable openings from the chambers 1.2.
    The sealing elements 5 and 6 can each be formed by two rollers or two flaps or a roller and a flap, between which the metal strip 3 is passed. The gap between the rollers or flaps is defined taking into account the properties (chemical composition, temperature) of the atmosphere gas in chamber 1 (or 2) and the strip thickness. It can be fixed or adjustable depending on the variation in the properties of the atmosphere gas and the strip dimensions , If the gap is adjustable, it is preset according to strip thickness, chemical composition of the atmosphere gas and according to the strip temperature. The size of the opening in the sealing elements 5 and 6 depends on the gap of the strip dimensions (width, thickness), as well as the remaining construction-related openings. In order to achieve a good sealing performance, the opening in the sealing elements 5.6 must be correspondingly small.
    The pressure Pd in the sealing chamber 7 between the two sealing elements 5, 6 can be adjusted by the control valve 10. The control valve 10 regulates the flow rate of the injected or discharged into the seal chamber 7 gas. In Fig. 1, the control valve 10 is connected to a gas supply 8, the Druckrsgelung in the seal chamber 7 thus takes place via a control of the gas supply in the seal chamber. 7
    The chamber pressures P1 and P2 are controlled by two independent pressure control circuits. For the control of the lock 4, the pressure Pd in the seal chamber 7 and in the protective gas chamber 2 is measured. The pressure Pd is kept near the pressure P2 in the protective gas chamber 2. 9
    5005-AT
    In the example shown in FIG. 1, Pd-P2 is determined. The pressure Po is controlled so that APoichtung remains largely constant, even if the pressure P2 varies.
    With the device according to FIG. 1, two pressure control strategies for the lock 4 can be followed, for example: 1.) Contamination of the protective gas chamber 2 should be avoided:
    The aim is to prevent the entry of atmospheric gas through the lock 4 into the protective gas chamber 2, so that the chemical composition in this chamber can be regulated. The aim is also to minimize the escape of atmospheric gas from the protective gas chamber 2, so that the gas consumption of the protective gas chamber 2 can be minimized.
    Figure 2 shows the Dmckverlauf in the chambers 1,2, and7. The pressure P1 in the sub chamber 1 is set lower than the pressure P2 in the protective gas chamber 2, while the pressure in the sealing chamber Pd is set between P1 and P2 but only slightly lower than the pressure P2 in the protective gas chamber 2. If the pressure P2 in the protective gas chamber 2 changes, the pressure Pd is correspondingly adjusted in order to keep the pressure difference APoich = Pd-P2 as constant as possible. APoichtung is negative here. The flow rate F2 of the atmosphere gas into or out of the protective gas chamber 2 is regulated by the differential pressure APoichtung.
    If APoichtung is kept below the value for the critical differential pressure APoichtung k, no atmosphere gas enters the protective gas chamber 2. By controlling APoichtung as close as possible to the value APoichtung k &gt; For example, the flow rate F2 of the escaping atmosphere gas from the protective gas chamber 2 can be minimized. The flow rate FD is determined by the pressure control loop for the control of APoichtung, while the flow rate F1 results from F2 + FD. 10
    5005-AT
    This control strategy is suitable for applications in which the chemical composition in the protective gas chamber 2 must be optimally controlled. For example, this strategy can be well used in continuous annealing plants (CAL) and in continuous high temperature (CGL) galvanizing plants (CGL). The chamber with the high Hr content forms the aforementioned protective gas chamber 2. This control strategy is also suitable for the heating, immersion and radiant tube cooling chambers with high H2 content in the electrical steel heat treatment. Again, the chamber with the high hfe content forms the chamber 2. 2.) A leakage of inert gas from the protective gas chamber 2 should be avoided:
    The aim is to prevent leakage of atmosphere gas from the protective gas chamber 2, so that the secondary chamber 1 is not contaminated by a component of the protective gas chamber 2. However, the entry of atmospheric gas into the protective gas chamber 2 should also be minimized.
    FIG. 3 shows the pressure curve in the chambers 1, 2 and 7, wherein the pressure P1 in the secondary chamber 1 is set to be lower than the pressure P2 in the protective gas chamber 2. The pressure PD in the seal chamber 7 is set higher than P1 and P2, but only slightly higher than the pressure P2 in the protective gas chamber 2. If the pressure P2 in the protective gas chamber 2 changes, then the pressure PD is adjusted accordingly in order to keep the pressure difference APoichtung = Po-P2 as constant as possible. APDich »i« g is positive here. The flow rate F2 of the atmosphere gas into or out of chamber 2 is regulated by the value of the solution.
    If APofctang is kept above the value for the (calculated) critical pressure difference APDichtung k, no atmosphere gas escapes from the protective gas chamber 2. By controlling APotcwimg as close as possible to the value APDichtung k, the flow rate F2 of the 11 flowing in chamber 2 can be determined
    5005-AT • Φ · ·
    Atmospheric gases are minimized. The flow rate Fd is determined by the pressure control loop for the control of APdic «^, while the flow rate F1 results from FD - F2.
    This control strategy is suitable for applications in which no atmosphere gas may escape from the protective gas chamber 2 and in which the protective gas chamber 2 may not be contaminated by atmospheric gas from the secondary chamber 1. For example, it can be used to control the input or output port in FAL, CAL and CGL. The furnace also forms the protective gas chamber 2. It is also suitable for lock control in zinc-aluminum-sealing processes (the trunk forms the protective gas chamber 2) or for processes with chambers with different dew points. The chamber with the high dew point then forms the protective gas chamber 2.
    In Figure 4, a variant is shown, in which the sealing chamber 7 is connected to a vacuum source Θ. In FIG. 4, in contrast to FIG. 1, the regulation of the gas pressure in the sealing chamber 7 takes place via a gas discharge Fq.
    By adjusting the flow rate FD of the gas flowing out of the seal chamber 7, the pressure Pd in the seal chamber 7 is continuously adjusted. The flow rate Fd of the effluent gas is controlled by a control valve 10, wherein the underpressure is generated by means of a suction fan or by the natural flue draft.
    In the example shown in FIG. 4, the metal strip runs out of the protective gas chamber 2 into the lock 4. However, the control strategy does not depend on the direction of strip travel. The pressure in the sealing chamber Pd is controlled so that APoictitung remains as constant as possible, even if the pressure P2 varies in the protective gas chamber 2.
    With the device according to FIG. 4, for example, two different pressure control strategies can be pursued: 12
    5005-AT * ·· ♦ 1.) Leakage from the protective gas chamber 2 should be avoided:
    The aim is to avoid leakage of atmosphere gas from the protective gas chamber 2, so that the secondary chamber 1 is not contaminated by a component from the protective gas chamber 2, but also to minimize the entry of atmospheric gas into the protective gas chamber 2, so that the chemical composition in the protective gas chamber 2 can be regulated.
    FIG. 5 shows the pressure profile in the chambers 1, 2 and 7 for a lock 4 according to FIG. 4. The pressure P 1 in the secondary chamber 1 is set to be higher than the pressure P 2 in the protective gas chamber 2. The pressure PD in the seal chamber 7 is set between P1 and P2, but only slightly higher than the pressure P2 in the protective gas chamber 2. If the pressure P2 in the protective gas chamber 2 changes, the pressure Pd is correspondingly adjusted in order to keep the pressure difference APoicwung = Pd-P2 as constant as possible. APDichtung is so positive here. The flow rate F2 of the atmosphere gas into or out of chamber 2 is regulated via the APoichtung value.
    If the APpole is kept above the critical value for the differential pressure APoicMung.k, no atmosphere gas escapes from the protective gas chamber 2. If the size APDichtung is regulated as close as possible to the value APoichtk, then the flow rate F2 of the atmospheric gas flowing into the protective gas chamber 2 can be minimized. The flow rate FD is determined by the pressure control loop for control of APoicwung, while the flow rate F1 results from F2 + Fd.
    This control strategy is suitable for installations in which no atmosphere gas is allowed to escape from the protective gas chamber 2 and in which the inflow into the protective gas chamber 2 must be minimized. The applications are the same as the applications for FIG. 3, but in the case where the pressure P2 in the protective gas chamber 2 is lower than in the secondary chamber 1. 13
    5005-AT 2.) Contamination of the protective gas chamber 2 should be avoided:
    The aim is to avoid the entry of atmosphere gas into the protective gas chamber 2 (so that the chemical composition in the protective gas chamber 2 can be controlled), but also to minimize the escape of atmospheric gas from the protective gas chamber 2 (so as to minimize the gas consumption of the protective gas chamber 2) can).
    Fig. 6 shows the pressure waveform in the chambers 1,2 and 7. The pressure P1 in the sub chamber 1 is set higher than the pressure P2 in the protective gas chamber 2, while the pressure PD in the sealing chamber 7 is less than P1 and P2, but only slightly less than the pressure P2 in the protective gas chamber 2, is set. If the pressure P2 changes, the pressure PD is adjusted accordingly in order to keep the pressure difference APoich = Pd-P2 as constant as possible. APoichtung is negative here. The flow rate F2 of the atmosphere gas into or out of chamber 2 is regulated via the APoichtung value.
    If APoichtung is kept below the value for the critical differential pressure APoichtung k, no atmosphere gas in chamber 2 occurs. If the size APoichtung is controlled as close as possible to the value APoichtung k, then the flow rate of the escaping atmospheric gas F2 from chamber 2 can be minimized. The flow rate Fo is determined by the pressure control loop for the control of APoichtung, while flow rate F1 results from Fd + F1
    This control strategy is well suited if the chemical composition in the protective gas chamber 2 must be optimally controlled, but the outflow of atmospheric gas from the protective gas chamber 2 must be minimized or if the chemical composition in both chambers 1, 2 must be optimally controlled. 14
    5005-AT
    Since the leakage amount of the gas can not be measured through a sealing member (5, 6), a mathematical model has been developed for their calculation.
    The model allows the calculation of the differential pressure APoichtung between the protective gas chamber 2 and the sealing chamber 7 (APoichtung = Pd - P2) depending on the following parameters: • physical properties of the atmosphere gas (such as specific gravity and viscosity): These properties are from the chemical composition (Percentage of H2 and N2, etc.) and the temperature of the atmosphere gas flowing through the seal members. • open area in the sealing elements 5,6: The open area depends on the gap set in the sealing elements and the strip dimensions (thickness, width). • Line Speed: Line Speed is the speed of the treated tape. Flow of the atmosphere gas Fd, F1, F2: The flow F1 or F2 of the atmosphere gas through the seal members 5, 6 is considered as a parameter to be controlled. • Construction of the lock 4: Several technologies are available for the construction (flaps, rollers, miscellaneous ...). The mathematical model takes into account the respective technology.
    The mathematical model is based on a formula that represents the relationship between the parameters. The calculation requires little computational effort and can therefore be integrated into furnace controls.
    The mathematical model is as follows: APpuration = f1 (P, M.h, Vs) + f2 (p, μ, h, Vg) A direction = pressure difference between the seal chamber 7 and the shield gas chamber 2 15
    5005-AT • ·· · p = specific gravity of the atmosphere gas μ - dynamic viscosity of the atmosphere gas h = geometric factor
    Vg = flow rate of the atmosphere gas flowing into or out of the seal chamber 7
    Vs = line speed = belt speed f1 and f2 are mathematical formulas that depend on the structure of the lock 4 (rollers, flaps) and on the nature of the gas flow (laminar, turbulent).
    The parameters of the mathematical model are tuned by means of computer-controlled simulation software in offline mode.
    The model provides the value for the critical differential pressure APoichtung * between the seal chamber 7 and the protective gas chamber 2, which does not lead to any gas flow between the protective gas chamber 2 and the seal chamber 7 (Vg = 0). This critical value APoiehung.k serves as a reference for the pressure regulation in the sealing chamber 7. The setpoint for the differential pressure APoichtung depends on the calculated critical differential pressure APout *. as described in the above examples.
    When the differential pressure is higher than this critical value. then the atmosphere gas flows out of the sealing chamber 7 into the protective gas chamber 2. It is important that one also takes into account the respective signs of the differential pressures APoichtung and APoichtung *. "Higher &quot; or "above" is synonymous with the phrase "further in the positive number range".
    If the differential pressure ΔPoichtung is below the value for the critical differential pressure ΔPout *, the atmosphere gas flows out of the protective gas chamber 2 into the sealing chamber 7.
    It should be pointed out again that the differential pressure APoichtung can also be negative (eg in FIGS. 2 and 6). The remark that the differential pressure APoichtung is below the value for the critical differential pressure APoichtung, k, is then to be understood that the value for the differential pressure 16
    5005-AT • ** · ♦ Appearance continues to be in the negative range than the value for the critical differential pressure APoichtung.k ·
    The mathematical model wind on the one hand used for the calculation of the gap to be set of the two sealing elements 5, 6, taking into account the properties of the atmosphere gas and the strip thickness.
    On the other hand, it is used for the calculation of the value for the critical differential pressure ΔΡο ^^, κ between the sealing chamber 7 and the protective gas chamber 2. With the aid of the calculated critical differential pressure APachtung.k the differential pressure APoicwung (setpoint value) to be set is then determined.
    The adjustment parameters calculated with the mathematical model form the setpoint values for the control of the lock. 17
    5005-AT
    权利要求:
    Claims (10)
    [1]
    1. A method for controlling the protective gas atmosphere in a protective gas chamber {2) for the continuous treatment of metal strips (3), wherein the metal strip (3) via locks (4) in and out of the protective gas chamber (3). 2) and wherein at least one of the locks (4) has two sealing elements (5, 6) for the passing metaiiband (3) so that a sealing chamber (7) forms between the two sealing elements (5, 6), characterized in that the gas pressure (P2, PD) in the protective gas chamber (2) and in the sealing chamber (7) of the lock (4) is measured and that the pressure (Pd) in the sealing chamber (7) is regulated in such a way that during operation of the Differential pressure (APoichtung) between the protective gas chamber (2) and the seal chamber (7) as far as possible above or below a predetermined value for the critical differential pressure (ΔΡα ^^ *) is maintained.
    [2]
    2. The method according to claim 1, characterized in that the pressure (Pd) in the sealing chamber (7) via a control valve (10) and a gas supply (8) is regulated.
    [3]
    3. The method according to claim 1, characterized in that the pressure (Pd) in the sealing chamber (7) is controlled by a control valve (10) and a vacuum source (9).
    [4]
    4. The method according to claim 1, characterized in that the pressure (PD) in the sealing chamber (7) via two control valves (10), a gas supply (8) and a vacuum source (9) is regulated.
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that the lock (4) between the protective gas chamber (2) and a further treatment chamber (1) is arranged with a protective gas atmosphere.
    [6]
    6. The method according to claim 5, characterized in that the metal strip (3) is first passed through the further treatment chamber (1) and then through the protective gas chamber (2). 18 5005-AT φφ • φ • φφφφ φ • ♦ * * *
    [7]
    7. The method according to claim 5, characterized in that the metal strip (3) is first passed through the protective gas chamber (2) and then through the further treatment chamber (1).
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that, the critical value for the differential pressure (APoichtung.k) is calculated via a mathematical model, the speed of the metal strip, the gap opening of the two Dichtungsseiemente (5, 6) , which takes into account properties of the protective gas and the thickness of the metal strip (3).
    [9]
    9. The method according to claim 8, characterized in that the optimum gap opening of the two sealing elements (5, 6) based on the properties of the protective gas and the thickness of the metal strip (3) is calculated.
    [10]
    10. The method according to any one of claims 1 to 9, characterized in that the set in operation value for the differential pressure (APotchtung,) is kept as close to the critical value for the differential pressure (APoichtung, k), so that the gas flow (F2) from or in the protective gas chamber (2) is minimized. 19 5005-AT
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    同族专利:
    公开号 | 公开日
    US8893402B2|2014-11-25|
    CA2825855C|2018-05-01|
    JP2014505795A|2014-03-06|
    KR101807344B1|2017-12-08|
    ZA201306439B|2014-10-29|
    RU2592653C2|2016-07-27|
    PL2671035T3|2015-04-30|
    EP2671035B1|2014-12-03|
    AT511034B1|2013-01-15|
    JP6061400B2|2017-01-18|
    WO2012103563A1|2012-08-09|
    EP2671035A1|2013-12-11|
    ES2531482T3|2015-03-16|
    CN103380346B|2015-08-05|
    RU2013138601A|2015-03-10|
    BR112013019485A2|2019-11-05|
    US20130305559A1|2013-11-21|
    BR112013019485B1|2021-03-09|
    KR20140022003A|2014-02-21|
    CA2825855A1|2012-08-09|
    CN103380346A|2013-10-30|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA152/2011A|AT511034B1|2011-02-04|2011-02-04|METHOD FOR CONTROLLING A PROTECTION GASATOMOS IN A PROTECTIVE GAS CHAMBER FOR TREATING A METAL STRIP|ATA152/2011A| AT511034B1|2011-02-04|2011-02-04|METHOD FOR CONTROLLING A PROTECTION GASATOMOS IN A PROTECTIVE GAS CHAMBER FOR TREATING A METAL STRIP|
    PL12715806T| PL2671035T3|2011-02-04|2012-01-30|Method for controlling a protective gas atmosphere in a protective gas chamber for the treatment of a metal strip|
    JP2013552060A| JP6061400B2|2011-02-04|2012-01-30|Method for controlling the protective gas atmosphere in a protective gas chamber for the treatment of metal strips|
    BR112013019485-5A| BR112013019485B1|2011-02-04|2012-01-30|method for controlling a shielding gas atmosphere|
    PCT/AT2012/000013| WO2012103563A1|2011-02-04|2012-01-30|Method for controlling a protective gas atmosphere in a protective gas chamber for the treatment of a metal strip|
    KR1020137022825A| KR101807344B1|2011-02-04|2012-01-30|Method for controlling a protective gas atmosphere in a protective gas chamber for the treatment of a metal strip|
    US13/982,348| US8893402B2|2011-02-04|2012-01-30|Method for controlling a protective gas atmosphere in a protective gas chamber for the treatment of a metal strip|
    CA2825855A| CA2825855C|2011-02-04|2012-01-30|Method for controlling a protective gas atmosphere in a protective gas chamber for the treatment of a metal strip|
    ES12715806.1T| ES2531482T3|2011-02-04|2012-01-30|Procedure for controlling a protective gas atmosphere in a protective gas chamber for the treatment of a metal band|
    EP12715806.1A| EP2671035B1|2011-02-04|2012-01-30|Method for controlling a protective gas atmosphere in a protective gas chamber for the treatment of a metal strip|
    CN201280007304.XA| CN103380346B|2011-02-04|2012-01-30|For the treatment of the control method of protective gas atmosphere in the protective gas room of metal band|
    RU2013138601/02A| RU2592653C2|2011-02-04|2012-01-30|Method of controlling protective gas atmosphere in protective gas chamber for treatment of metal strip|
    ZA2013/06439A| ZA201306439B|2011-02-04|2013-08-27|Method for controlling a protective gas atmosphere in a protective gas chamber for the treatment of a metal strip|
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