CN107665264B - Monitoring method for dynamic accumulation of zinc pot bottom slag - Google Patents
Monitoring method for dynamic accumulation of zinc pot bottom slag Download PDFInfo
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- CN107665264B CN107665264B CN201610600141.6A CN201610600141A CN107665264B CN 107665264 B CN107665264 B CN 107665264B CN 201610600141 A CN201610600141 A CN 201610600141A CN 107665264 B CN107665264 B CN 107665264B
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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Abstract
The invention discloses a monitoring method for dynamic accumulation of zinc pot bottom slag, which comprises the following steps: parameter for obtaining zinc liquid and zinc pot bottom slag in zinc pot to be monitoredCounting; selecting a fluid simulating the zinc liquid to obtain parameters of the fluid simulating the zinc liquid; determining the density rho of particles simulating the bottom slag of a zinc potinc,m(ii) a Determining the diameter D of the particles simulating the bottom slag of the zinc potinc,m(ii) a According to the density pinc,mAnd diameter Dinc,mSelecting particles simulating zinc pot bottom slag; constructing a dynamic accumulation model of the bottom slag of the zinc pot according to the selected fluid simulating the zinc liquid and the selected particles simulating the bottom slag of the zinc pot; simulation strip steel running speed V for determining bottom slag particle flooding in zinc pot bottom slag dynamic accumulation modelL: and (3) calculating the critical speed Vp of the strip steel when the slag in the actual zinc pot is flooded, and controlling the actual running speed of the strip steel to be less than or equal to Vp. Compared with a slag-free flow field experiment, the method is more suitable for researching the movement and accumulation behavior of the bottom slag of the zinc pot relative to the zinc liquid, so that the bottom slag is effectively controlled to be overflowed.
Description
Technical Field
The invention relates to a monitoring method for dynamic accumulation of bottom slag in the field of metallurgy, in particular to a monitoring method for dynamic accumulation of bottom slag in a zinc pot.
Background
In the continuous hot galvanizing production process, strip steel is subjected to high-temperature pretreatment and then continuously enters a zinc pot for hot galvanizing in zinc liquid at 460 ℃ under the drive of a sink roll, and zinc-iron phase alloy-zinc slag which takes iron and zinc as main components is continuously accumulated in the zinc pot due to metallurgical reaction of metals such as iron, zinc, aluminum and the like. The zinc slag is divided into dross, free slag and bottom slag according to different density ratios of the dross to the zinc liquid. Wherein, the bottom slag with higher density is piled up at the bottom of the zinc pot. The movement of the strip steel and the sink roll in the zinc liquid can cause a zinc liquid flow field, and the bottom slag which is flooded under the zinc liquid flow field can cause the zinc liquid to have poor fluidity and can be adhered to the surface of a galvanized plate to cause serious surface quality problems. The higher the stacking height of the bottom slag is, the more easily the bottom slag is spread, so that the regular cleaning of the bottom slag is beneficial to controlling the spreading of the bottom slag. However, frequent cleaning of the bottom slag also reduces the production efficiency of the unit and increases the production cost. Therefore, the rule of the dynamic accumulation of the bottom slag of the zinc pot needs to be researched, and a method for effectively controlling the bottom slag to overflow is found.
A numerical simulation method is generally adopted for researching the movement and accumulation problems of the zinc dross in the zinc pot, but the deviation of the result from the field situation is large because of introducing assumed conditions and empirical formulas in the calculation process. Model experiment is another important research method, and the complex system can be directly observed by an effective model experiment method without the limitation of production field conditions. Therefore, the model experiment result is closer to the field condition and further realizes the monitoring of production.
At present, an approximation method of a slag-free flow field experiment is adopted in a model experiment of movement and accumulation behaviors of zinc slag in a zinc pot, and the method is not suitable for researching the movement and accumulation behaviors of bottom slag with larger particle size and density relative to zinc liquid, namely the bottom slag in the zinc pot.
Disclosure of Invention
The invention aims to provide a monitoring method for dynamic accumulation of bottom slag of a zinc pot, which obtains the rule of the dynamic accumulation of the bottom slag of the zinc pot based on a model experiment suitable for researching the motion and accumulation behavior of the bottom slag of the zinc pot relative to molten zinc and effectively controls the overflow of the bottom slag based on the rule.
In order to achieve the aim, the invention provides a monitoring method for dynamic accumulation of zinc pot bottom slag, which comprises the following steps:
obtaining the density rho of the zinc liquid in the zinc pot to be monitoredf,pViscosity upsilon of zinc liquidf,pDensity rho of bottom slag of zinc potinc,pDiameter D of zinc pot bottom slaginc,p(ii) a Wherein the viscosity v of the zinc liquidf,pHas the unit of m2(s) density of slag at bottom of zinc pot ρinc,pUnit of (b) is kg/m3(ii) a Zinc liquid density rhof,pUnit of (b) is kg/m3(ii) a Diameter D of zinc pot bottom slaginc,pThe unit of (a) is m;
selecting a fluid simulating the zinc liquid to obtain the viscosity upsilon of the fluid simulating the zinc liquidf,mAnd density ρf,m(ii) a In which the viscosity v of the fluid simulating the zinc liquid isf,mHas the unit of m2S; density rho of fluid simulating zinc liquid at normal temperaturef,mUnit of (b) is kg/m3；
Determining the density rho of particles simulating the bottom slag of a zinc pot according to the following formula (1)inc,m：
Wherein the density of the particles is rhoinc,mUnit of (b) is kg/m3(ii) a Lambda represents the geometric similarity ratio, and the value range of the lambda is lambda less than 1;
determining the diameter D of the particles simulating the bottom slag of the zinc pot according to the following formula (2)inc,m：
Wherein the diameter D of the particlesinc,mThe unit of (a) is m;
according to the density pinc,mAnd diameter Dinc,mSelecting particles simulating zinc pot bottom slag;
constructing a dynamic accumulation model of the bottom slag of the zinc pot according to the selected fluid simulating the zinc liquid and the selected particles simulating the bottom slag of the zinc pot;
determining the simulated strip steel running speed V when bottom slag particles in the dynamic accumulation model of the zinc pot bottom slag are flooded according to the following formula (3)L：
VL＝K×(Dinc,m×ρinc,m×ρf,m×νf,m)/(W×H) (3)
Wherein, VLThe unit of (a) is m/s; k is a fitting coefficient in m6/kg2(ii) a W represents the width of the simulated strip steel, and the unit of W is m; h represents the simulated bottom slag stacking height, and the unit of the simulated bottom slag stacking height is m;
according to the simulation of the running speed of the strip steel
And (3) calculating the critical speed Vp of the strip steel when the slag in the actual zinc pot is flooded, and controlling the actual running speed of the strip steel to be not more than Vp, wherein lambda represents a geometric similarity ratio which is the same as the value in the formula (1).
Hair brushThe conception of the monitoring method for the dynamic accumulation of the zinc pot bottom slag is mainly as follows: a simulated zinc pot, simulated zinc liquid (usually transparent fluid to facilitate observation), simulated zinc pot bottom slag and simulated strip steel are respectively manufactured on the basis of a similar theory by referring to an actual zinc pot, zinc liquid, zinc pot bottom slag and strip steel, so that a dynamic stacking model of the zinc pot bottom slag is constructed, wherein the size of the simulated zinc pot, the width W of the simulated strip steel and the stacking height H of the simulated zinc pot bottom slag are determined by a geometric similarity ratio lambda, the lambda is the size ratio of the model to a prototype, and the lambda is preferably selected according to the size of the determined model to observe and monitor properly. Based on the model, the simulated strip steel running speed V when bottom slag particles in the dynamic accumulation model of the zinc pot bottom slag are flooded is observedLSimulating the width W of the strip steel, the stacking height H of the bottom slag and the diameter D of the particles simulating the bottom slag of the zinc potinc,mSimulating the density rho of the particles of the bottom slag of the zinc potinc,mSimulating the fluid density rho of the zinc liquidf,mViscosity upsilon of fluid simulating zinc liquidf,mSelecting a proper fitting coefficient K according to the fitting relation between the bottom slag particles and the bottom slag particles, and obtaining the simulated strip steel running speed V when the bottom slag particles in the zinc pot bottom slag dynamic accumulation model are expanded under any simulation parameter value (the value corresponds to an actual parameter and is determined based on a similar theory) based on the fitting coefficient KL. Then according to the gravity similarity equation
The critical speed Vp of the strip steel when the slag in the actual zinc pot is flooded can be obtained, and the actual running speed of the strip steel is controlled to be not more than Vp, so that the slag in the actual zinc pot is always controlled to be in a non-flooded state. Because the model adopted by the method is constructed based on a similar theory, the experiment based on the model is suitable for researching the movement and the accumulation behavior of the bottom slag of the zinc pot relative to the zinc liquid, and the rule of the dynamic accumulation of the bottom slag of the zinc pot is obtained, so that the bottom slag overflow is effectively controlled based on the rule.
The invention provides a similar theoretical framework of a zinc pot bottom slag dynamic accumulation model experiment based on a point-based synthetic motion theorem. The relative motion and the linked motion of the bottom slag particles are synthesized into absolute motion, and the similarity of the absolute motion of the bottom slag in the model and the prototype is equivalent to the similarity of the model and the prototype in the zinc liquid flow field and the similarity of the bottom slag relative to the zinc liquid motion. Through a plurality of experimental simulations, a geometric similarity equation as formula (1) and a particle similarity equation as formula (2) are derived. Compliance with turbulent reynolds similarity criteria may be verified under certain embodiments to further ensure that the model zinc-liquid flow field is similar to that of the prototype. The method has complete similar theoretical basis and comprises a whole set of technical scheme, and is simple to operate and easy to realize.
Furthermore, in the monitoring method for the dynamic accumulation of the zinc pot bottom slag, the dynamic accumulation of the zinc pot bottom slag is 1.0 × 10-6m2/s＜υf,m＜1.0×10-4m2The fluid simulating the zinc bath is selected as the/s.
Further, in the monitoring method for the dynamic accumulation of the bottom slag of the zinc pot according to the invention or the above, the weight is 1000kg/m3＜ρf,m＜1500kg/m3A fluid simulating zinc bath was selected.
Furthermore, in the monitoring method for the dynamic accumulation of the zinc pot bottom slag, the value range of K is 9m6/kg2-12m6/kg2。
Further, in the monitoring method for the dynamic accumulation of the zinc pot bottom slag, the value range of W is 0.25m to 0.34 m.
Further, in the monitoring method for the dynamic accumulation of the zinc pot bottom slag, the value range of H is 0.055m-0.095 m.
Compared with a slag-free flow field experiment, the monitoring method for the dynamic accumulation of the bottom slag of the zinc pot is more suitable for researching the movement and accumulation behavior of the bottom slag with larger particle size and density relative to the zinc liquid, so that the rule of the dynamic accumulation of the bottom slag of the zinc pot closer to the real condition is obtained, and the bottom slag overflow is effectively controlled based on the rule.
Drawings
FIG. 1 is a schematic flow chart of a monitoring method for dynamic accumulation of zinc pot bottom slag according to an embodiment of the invention.
Detailed Description
The monitoring method for the dynamic accumulation of the bottom slag of the zinc pot is further explained with reference to the drawings and the specific examples in the specification, but the explanation does not constitute an improper limitation to the technical scheme of the invention.
FIG. 1 illustrates a flow of the monitoring method for the dynamic accumulation of the bottom slag of the zinc pot in one embodiment of the invention.
As shown in fig. 1, the monitoring method for the dynamic accumulation of the bottom slag of the zinc pot in the embodiment comprises the following steps:
step 110: obtaining the density rho of the zinc liquid in the zinc pot to be monitoredf,pViscosity upsilon of zinc liquidf,pDensity rho of bottom slag of zinc potinc,pDiameter D of zinc pot bottom slaginc,p(ii) a Wherein the viscosity v of the zinc liquidf,pHas the unit of m2(s) density of slag at bottom of zinc pot ρinc,pUnit of (b) is kg/m3(ii) a Density of zinc liquid rho f,pUnit of (b) is kg/m3(ii) a Diameter D of zinc pot bottom slaginc,pThe unit of (d) is m.
In the step, zinc pot prototype parameters in the zinc pot to be monitored, including main structure parameters of the zinc pot (such as the height and diameter of a zinc pot cavity) and the width W of the strip steel, are also obtainedp(unit is m), bottom slag stacking height Hp(unit is m). In the present embodiment, the molten zinc density ρf,p＝6700kg/m3Viscosity v of zinc liquidf,p＝5.9×10-7m2(s) density of slag at bottom of zinc pot ρinc,p＝7300kg/m3Diameter D of zinc pot bottom slaginc,p＝0.3×10-3m, strip width Wp1.7m, bottom slag stacking height Hp＝0.165m。
Step 120: selecting a fluid simulating the zinc liquid to obtain the viscosity upsilon of the fluid simulating the zinc liquidf,mAnd density ρf,m(ii) a In which the viscosity v of the fluid simulating the zinc liquid isf,mHas the unit of m2S; density rho of fluid simulating zinc liquid at normal temperaturef,mUnit of (b) is kg/m3。
In this step, the pressure may be adjusted to 1.0 × 10-6m2/s＜υf,m＜1.0×10-4m2Selecting a fluid simulating zinc liquid; can be according to 1000kg/m3＜ρf,m＜1500kg/m3A fluid simulating zinc bath was selected. In this embodiment, the simulated zinc solution is selected to be a transparent sodium chloride aqueous solution with a viscosity upsilonf,m＝1.05×10-6m2S, density at room temperature ρf,m＝1035kg/m3。
Step 130: determining the density rho of particles simulating the bottom slag of a zinc pot according to the following formula (1)inc,m：
Wherein the density of the particles is rhoinc,mUnit of (b) is kg/m3(ii) a And lambda represents the geometric similarity ratio, and the value range of the lambda is lambda less than 1.
In this step, λ is the ratio of the dimensions of the model to the prototype, and λ is selected so that the model size determined is suitable for observation and monitoring. In the present embodiment, λ is selected to be 1/5. Substituting the parameter data into a formula (1) to obtain the density rho of the particles simulating the bottom slag of the zinc potinc,m＝1040kg/m3。
Step 140: determining the diameter D of the particles simulating the bottom slag of the zinc pot according to the following formula (2)inc,m：
Wherein the diameter D of the particlesinc,mThe unit of (d) is m.
In the step, the parameter data are substituted into a formula (2) to obtain the diameter D of the particles simulating the bottom slag of the zinc potinc,m＝1.2×10-3m。
Step 150: according to the density pinc,mAnd diameter Dinc,mSelecting particles simulating the bottom slag of the zinc pot.
In the step, ABS particles simulating black zinc pot bottom slag are selected according to the requirement of wettability.
Step 160: and constructing a dynamic accumulation model of the bottom slag of the zinc pot according to the selected fluid simulating the zinc liquid and the selected particles simulating the bottom slag of the zinc pot.
In the step, the constructed dynamic stacking model of the bottom slag of the zinc pot further comprises a simulated zinc pot and a simulated strip steel, wherein the size of the simulated zinc pot, the width W of the simulated strip steel and the stacking height H of the bottom slag of the simulated zinc pot are determined by a geometric similarity ratio λ, the value range of W is usually 0.25m to 0.34m, the value range of H is 0.055m to 0.095m, the width W of the simulated strip steel is 0.34m in the embodiment, and the stacking height H of the bottom slag of the simulated zinc pot is 0.055 m. The main parts of the simulated zinc pot are made of transparent organic glass, and the simulated steel band is made of a transparent PVC soft plate. In addition, in order to realize the simulation of the continuous movement of the strip steel, a driving roller, a balance roller and a tension roller are designed, a 90W alternating current speed regulating motor is selected as the motor, and is connected with the driving roller through a plum coupling and drives a belt to rotate; the stopper device is designed and arranged on the tension roller, so that the belt is prevented from deviating, and the guide plate is additionally arranged below the tension roller to prevent the fluid on the upper part from dripping and interfering the flow field.
Step 170: determining the simulated strip steel running speed V when bottom slag particles in the dynamic accumulation model of the zinc pot bottom slag are flooded according to the following formula (3)L：
VL＝K×(Dinc,m×ρinc,m×ρf,m×νf,m)/(W×H) (3)
Wherein, VLThe unit of (a) is m/s; k is a fitting coefficient in m6/kg2(ii) a W represents the width of the simulated strip steel, and the unit of W is m; h represents the simulated bottom slag stacking height, and the unit of the simulated bottom slag stacking height is m.
In this step, K is usually in the range of 9m6/kg2-12m6/kg2. In the present embodiment, an experiment was performed based on the zinc pot bottom slag dynamic deposition model constructed as described above, and a fitting relationship was observed, with K being 11m6/kg2. Substituting the parameter data into a formula (3) to obtain the simulated strip steel running speed V when bottom slag particles in the zinc pot bottom slag dynamic accumulation model are flooded in the embodimentL＝0.79m/s。
Step 180: root of herbaceous plantAccording to the simulation of the running speed of the strip steel
And (3) calculating the critical speed Vp of the strip steel when the slag in the actual zinc pot is flooded, and controlling the actual running speed of the strip steel to be not more than Vp, wherein lambda represents a geometric similarity ratio which is the same as the value in the formula (1).
In this step, the above parameter data are substituted
Obtaining the critical speed of the strip steel when the bottom slag in the actual zinc pot is flooded
In addition, whether the simulated zinc liquid meets the Reynolds similarity criterion of turbulent flow, namely the Reynolds number Re > 1.0 × 10 can be verified5And if the simulation result does not meet the requirement, the particle parameters of the simulated zinc liquid and the simulated zinc pot bottom slag are determined again so as to further ensure that the simulated zinc liquid flow field is similar to that of the prototype.
It should be noted that the above-mentioned embodiments are only specific examples of the present invention, and obviously, the present invention is not limited to the above-mentioned embodiments, and many similar variations exist. All modifications which would occur to one skilled in the art and which are, therefore, directly derived or suggested from the disclosure herein are deemed to be within the scope of the present invention.
Claims (6)
1. A monitoring method for dynamic accumulation of zinc pot bottom slag comprises the following steps:
obtaining the density rho of the zinc liquid in the zinc pot to be monitoredf,pViscosity upsilon of zinc liquidf,pDensity rho of bottom slag of zinc potinc,pDiameter D of zinc pot bottom slaginc,p(ii) a Wherein the viscosity v of the zinc liquidf,pHas the unit of m2(s) density of slag at bottom of zinc pot ρinc,pUnit of (b) is kg/m3(ii) a Zinc liquid density rhof,pUnit of (b) is kg/m3(ii) a Diameter D of zinc pot bottom slaginc,pThe unit of (a) is m;
selecting a fluid simulating the zinc bath to obtain a simulated zinc bathViscosity v of the fluidf,mAnd density ρf,m(ii) a In which the viscosity v of the fluid simulating the zinc liquid isf,mHas the unit of m2S; density rho of fluid simulating zinc liquid at normal temperaturef,mUnit of (b) is kg/m3；
Determining the density rho of particles simulating the bottom slag of a zinc pot according to the following formula (1)inc，m：
Wherein the density of the particles is rhoinc,mUnit of (b) is kg/m3(ii) a Lambda represents the geometric similarity ratio, and the value range of the lambda is lambda less than 1;
determining the diameter D of the particles simulating the bottom slag of the zinc pot according to the following formula (2)inc,m：
Wherein the diameter D of the particlesinc,mThe unit of (a) is m;
according to the density pinc,mAnd diameter Dinc,mSelecting particles simulating zinc pot bottom slag;
constructing a dynamic accumulation model of the bottom slag of the zinc pot according to the selected fluid simulating the zinc liquid and the selected particles simulating the bottom slag of the zinc pot;
determining the simulated strip steel running speed V when bottom slag particles in the dynamic accumulation model of the zinc pot bottom slag are flooded according to the following formula (3)L：
VL＝K×(Dinc,m×ρinc,m×ρf,m×νf,m)/(W×H) (3)
Wherein, VLThe unit of (a) is m/s; k is a fitting coefficient in m6/kg2(ii) a W represents the width of the simulated strip steel, and the unit of W is m; h represents the simulated bottom slag stacking height, and the unit of the simulated bottom slag stacking height is m;
according to the simulation of the running speed of the strip steel
And (3) calculating the critical speed Vp of the strip steel when the slag in the actual zinc pot is flooded, and controlling the actual running speed of the strip steel to be not more than Vp, wherein lambda represents a geometric similarity ratio which is the same as the value in the formula (1).
2. The method for monitoring the dynamic accumulation of the bottom slag of the zinc pot as claimed in claim 1, wherein the monitoring is performed according to 1.0 × 10-6m2/s＜υf,m＜1.0×10-4m2The fluid simulating the zinc bath is selected as the/s.
3. The method for monitoring the dynamic accumulation of the bottom slag of the zinc pot as claimed in claim 1 or 2, characterized in that the method is based on 1000kg/m3＜ρf,m＜1500kg/m3A fluid simulating zinc bath was selected.
4. The method for monitoring the dynamic accumulation of the zinc pot bottom slag as claimed in claim 1, wherein the value range of K is 9m6/kg2-12m6/kg2。
5. The method for monitoring the dynamic accumulation of the zinc pot bottom slag as claimed in claim 1, wherein the value range of W is 0.25m to 0.34 m.
6. The monitoring method for the dynamic accumulation of the zinc pot bottom slag as claimed in claim 1, wherein the value range of H is 0.055m-0.095 m.
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