CN113652622A - Method and system suitable for optimizing cooling process of fan of galvanizing unit - Google Patents

Method and system suitable for optimizing cooling process of fan of galvanizing unit Download PDF

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CN113652622A
CN113652622A CN202110934657.5A CN202110934657A CN113652622A CN 113652622 A CN113652622 A CN 113652622A CN 202110934657 A CN202110934657 A CN 202110934657A CN 113652622 A CN113652622 A CN 113652622A
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strip steel
cooling
determining
warping
nozzle
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白振华
钱胜
王孝建
魏宝民
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Yanshan University
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Yanshan University
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    • C—CHEMISTRY; METALLURGY
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • 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
    • 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
    • C21D1/26—Methods of annealing
    • 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
    • C—CHEMISTRY; METALLURGY
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C—CHEMISTRY; METALLURGY
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The invention relates to a method and a system suitable for optimizing a cooling process of a fan of a galvanizing unit, wherein the method comprises the following steps: determining output information according to the equipment parameters and the pressure initial value information; determining the genetic plate shape warping direction of the strip steel of each section according to the process parameters; determining actual nozzle output information according to the genetic plate shape warping direction and the output information of the strip steel in each section; determining the cooling amplitude of the strip steel cooling affected area according to the actual nozzle output information and the equipment parameters; determining the warping distribution of the cooled strip steel according to the cooling amplitude of the strip steel cooling affected area and the maximum cooling amplitude of the strip steel so as to determine the warping average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process; and finishing the parameter optimization of the cooling fan according to the warping average warping information, warping inhibition initial value information and flow initial adjustment information of the strip steel C corresponding to the nozzles of each section in the cooling process. The invention can solve the problem of high warping incidence of the strip steel at the outlet of the unit.

Description

Method and system suitable for optimizing cooling process of fan of galvanizing unit
Technical Field
The invention relates to the field of cooling processes in a galvanizing continuous annealing process, in particular to a method and a system suitable for optimizing a cooling process of a fan of a galvanizing unit.
Background
The galvanization is the last process in the production of the plate strip, the purpose is to improve the aesthetic property, the corrosion resistance and the like of the product, and the galvanization process of the strip steel mainly comprises two parts: continuous annealing process and hot galvanizing process. The unfinished strip steel is firstly cleaned and then enters a continuous annealing furnace for annealing process, and four sub-procedures of preheating, heating, soaking, cooling and the like are required.
When the strip steel is heated to an annealing state in the continuous annealing furnace, the strip steel structure is changed from broken fine grains into coarse and complete grains, and the plasticity of the strip steel is improved. In order to meet the temperature condition of hot galvanizing, the continuous annealing furnace needs to finish rapid cooling so as to reduce the annealing temperature to the galvanizing temperature. The cooling process is realized by a fan system, and the fan system comprises a spray box with a cooling nozzle, a protective gas circulating fan and a protective gas heat exchanger. The protective gas in the furnace circulates through a circulating fan, and is blown to the strip steel from two sides of the strip steel at high speed by a nozzle of a spray box after being cooled by a gas heat exchanger. The cooling nozzles are divided into 3 zones along the longitudinal direction of the strip steel to ensure the temperature uniformity of the strip steel, and the gas flow of each zone is controlled and regulated by a flow valve.
When in the production process of an actual galvanizing unit, plate-shaped warping defects such as C warping and transverse warping defects along the width direction of strip steel often appear at the outlet of the unit, and the geometric deformation of transverse uneven extension (plastic strain) of the strip steel is caused by the surface temperature distribution of the strip steel in the heat treatment process. The defects can cause uneven surface distribution in the process of galvanizing the plate strip, cause unqualified products and waste of a large amount of strips. Therefore, the original unit equipment is required to be used for controlling the incidence rate of the defects of the strip steel, the cooling process is used as an important technical means, the cooling fan process is required to be optimized, the surface temperature distribution is optimized, the plate shape warping degree of an upstream process section is reduced, the C warping of the strip steel of the process section is inhibited, and the incidence rate of the plate shape warping of the unit outlet is finally reduced.
The relevant literature has been studied for some: in the patent of the gas circulation jet cooling device, the upper and lower air boxes are arranged on the upper and lower surfaces of the strip steel, and the uniformly distributed nozzles are arranged on the air boxes, so that the cooling uniformity in the width direction of the strip steel is improved; the patent annealing furnace cooling section cooling system, cooling process and stainless steel has the advantages that the annealing furnace cooling section and the cooling water supply pool are arranged, the strip steel cooling effect and the plate type control are improved, and the service lives of the first pipeline, the first spray head and the second spray head are prolonged; the patent 'an adjusting method for a cooling fan at an overaging section of a continuous annealing unit' provides an adjusting method for a cooling fan at an overaging section of a continuous annealing unit, and solves the problem of uneven power distribution of the cooling fan at the overaging section. Patent "gas circulation sprays cooling device with waste heat recovery function" a gas circulation sprays cooling device with waste heat recovery function, can transmit a large amount of heats under the low temperature difference, and heat transfer speed is fast, and is efficient. The prior literature has focused primarily on improvements in the equipment and the cooling effect and the uniformity of the temperature distribution over the surface of the strip without optimization from the point of view of the plant technology.
Disclosure of Invention
The invention aims to provide a fan cooling process optimization method and system suitable for a galvanizing unit so as to solve the problem of high warping incidence rate of strip steel at the outlet of the unit.
In order to achieve the purpose, the invention provides the following scheme:
a method suitable for optimizing a fan cooling process of a galvanizing unit comprises the following steps:
acquiring equipment parameters and process parameters of a galvanizing unit in a cooling process; the equipment parameters comprise the size of a nozzle, the specification of incoming strip steel, physical parameters and mechanical property parameters; the process parameters comprise belt speed, strip steel tension, upper surface temperature and lower surface temperature before strip steel enters a cooling section, furnace temperature of the cooling section and plate shape warping distribution of an upstream process section;
setting the maximum cooling amplitude, warping inhibition initial value information and pressure initial value information of the strip steel;
determining output information according to the equipment parameters and the pressure initial value information; the output information comprises a pressure output value, an upper wind box output total flow, a lower wind box output total flow and each section nozzle output maximum flow;
setting initial flow regulation information;
determining the genetic plate shape warping direction of the strip steel of each section according to the process parameters;
determining actual nozzle output information according to the strip steel genetic plate shape warping direction and the output information of each section;
determining the cooling amplitude of the strip steel cooling affected area according to the actual nozzle output information and the equipment parameters;
determining the warping distribution of the cooled strip steel according to the cooling amplitude of the strip steel cooling affected area and the maximum cooling amplitude of the strip steel;
determining the warping average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process according to the warping distribution of the cooled strip steel; the warping average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process comprises warping average warping inhibition rate of the strip steel C corresponding to the nozzles of each section in the cooling process and warping average warping sensitivity of the strip steel C corresponding to the nozzles of each section in the cooling process;
and finishing the parameter optimization of the cooling fan according to the warping average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process, the warping inhibition initial value information and the flow initial adjustment information.
Optionally, the determining of the cooling amplitude of the strip steel cooling affected area according to the actual nozzle output information and the equipment parameters specifically includes:
determining the sagging amount of the strip steel between the two furnace rollers according to the actual nozzle output information and the equipment parameters;
determining the actual vertical distance distribution between the nozzles and the strip steel according to the sagging amount of the strip steel between the two furnace rollers and the genetic plate shape warping direction of the strip steel in each section;
and determining the cooling amplitude of the strip steel cooling affected area by using a jet flow cooling model according to the actual vertical distance distribution between the nozzle and the strip steel.
Optionally, the determining the sagging amount of the strip steel between the two furnace rollers according to the actual nozzle output information and the equipment parameters specifically includes:
determining the pressure of the strip steel acted by the gas flowing out of the nozzle according to the actual nozzle output information;
determining a half-width value, a gravity equivalent load concentration, an upper and lower surface unbalanced wind equivalent concentrated load and a strip steel inertia moment of a cooling affected area according to the equipment parameters;
and determining the sagging amount of the strip steel between the two furnace rollers according to the pressure of the gas flowing out from the nozzle on the strip steel, the half-width value of the cooling affected area, the gravity equivalent load concentration, the wind equivalent concentrated loads with unbalanced upper and lower surfaces and the inertia moment of the strip steel.
Optionally, the determining of the cooling amplitude of the strip steel cooling affected area by using the jet cooling model according to the actual vertical distance distribution between the nozzle and the strip steel specifically includes:
determining the Reynolds number of the cooling gas of the cooling nozzle according to the actual nozzle output information;
determining the coefficient of the cooling nozzle according to the actual vertical distance distribution between the nozzle and the strip steel;
determining a Knudsen number from the cooling gas Reynolds number and the cooling nozzle coefficient;
determining the heat exchange coefficient of the surface of the strip steel according to the Knoop number and the equipment parameters;
and determining the cooling amplitude of the strip steel cooling affected area according to the surface heat exchange coefficient of the strip steel.
Optionally, the cooling distribution of the cooled strip steel is determined according to the cooling amplitude of the strip steel cooling affected area and the maximum cooling amplitude of the strip steel, and the method specifically comprises the following steps:
and judging whether the cooling amplitude of the strip steel cooling affected zone is smaller than or equal to the maximum cooling amplitude of the strip steel or not, if so, determining the warping distribution of the cooled strip steel according to the process parameters, and if not, returning to the step of setting the maximum cooling amplitude of the strip steel, warping inhibition initial value information and pressure initial value information.
Optionally, determining the average warping information of the band steel C warped corresponding to the nozzles of each section in the cooling process according to the warping distribution of the cooled band steel specifically includes:
determining the average warping inhibition rate of the strip steel C corresponding to the nozzles of each section in the cooling process according to the warping distribution of the cooled strip steel;
determining the average output flow of the nozzles according to the actual output information of the nozzles;
determining the relative difference of the average output flow of the cooling nozzles according to the average output flow of the nozzles;
and determining the warping average warping inhibition sensitivity of the strip steel C corresponding to the nozzles of each section in the cooling process according to the relative difference of the average output flow of the cooling nozzles.
A fan cooling process optimization system suitable for a galvanizing unit comprises:
the acquisition module is used for acquiring equipment parameters and process parameters of a galvanizing unit in a cooling process; the equipment parameters comprise the size of a nozzle, the specification of incoming strip steel, physical parameters and mechanical property parameters; the process parameters comprise belt speed, strip steel tension, upper surface temperature and lower surface temperature before strip steel enters a cooling section, furnace temperature of the cooling section and plate shape warping distribution of an upstream process section;
the first setting module is used for setting the maximum cooling amplitude, the warping inhibition initial value information and the pressure initial value information of the strip steel;
the output information determining module is used for determining output information according to the equipment parameters and the pressure initial value information; the output information comprises a pressure output value, an upper wind box output total flow, a lower wind box output total flow and each section nozzle output maximum flow;
the second setting module is used for setting initial flow regulation information;
the band steel genetic plate shape warping direction determining module is used for determining the band steel genetic plate shape warping direction of each section according to the process parameters;
the actual nozzle output information determining module is used for determining actual nozzle output information according to the strip steel genetic plate shape warping direction of each section and the output information;
the strip steel cooling affected area cooling amplitude determining module is used for determining the strip steel cooling affected area cooling amplitude according to the actual nozzle output information and the equipment parameters;
the cooled strip steel warpage distribution determining module is used for determining cooled strip steel warpage distribution according to the cooling amplitude of the strip steel cooling affected area and the maximum cooling amplitude of the strip steel;
the cooling process comprises a cooling process section nozzle and a cooling process section nozzle, wherein the cooling process section nozzle corresponds to a strip steel C warping average warping information determination module is used for determining the strip steel C warping average warping information corresponding to the cooling process section nozzle according to the cooled strip steel warping distribution; the warping average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process comprises warping average warping inhibition rate of the strip steel C corresponding to the nozzles of each section in the cooling process and warping average warping sensitivity of the strip steel C corresponding to the nozzles of each section in the cooling process;
and the cooling fan parameter optimization module is used for finishing cooling fan parameter optimization according to the average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process, the warping inhibition initial value information and the flow initial adjustment information.
Optionally, the module for determining the cooling amplitude of the strip steel cooling affected area specifically includes:
the device comprises a furnace roller and a furnace roller inter-roller strip steel sag determining unit, wherein the furnace roller inter-roller strip steel sag determining unit is used for determining the furnace roller inter-roller strip steel sag according to the actual nozzle output information and the equipment parameters;
the actual vertical distance distribution determining unit is used for determining the actual vertical distance distribution between the nozzles and the strip steel according to the sagging amount of the strip steel between the two furnace rollers and the genetic plate shape warping direction of the strip steel in each section;
and the strip steel cooling affected zone cooling amplitude determining unit is used for determining the strip steel cooling affected zone cooling amplitude by utilizing a jet flow cooling model according to the actual vertical distance distribution between the nozzle and the strip steel.
Optionally, the unit for determining the sagging amount of the strip steel between the two furnace rollers specifically comprises:
the pressure subunit of the strip steel acted by the gas flowing out of the nozzle is used for determining the pressure of the strip steel acted by the gas flowing out of the nozzle according to the actual nozzle output information;
the first determining subunit is used for determining the half-width value, the gravity equivalent load concentration, the wind power equivalent concentrated load with unbalanced upper and lower surfaces and the strip steel inertia moment of the cooling affected area according to the equipment parameters;
and the strip steel sagging amount determining subunit is used for determining the strip steel sagging amount between the two furnace rollers according to the pressure of the strip steel acted by the gas flowing out of the nozzle, the half-width value of the cooling influence area, the gravity equivalent load concentration, the wind power equivalent concentrated load with unbalanced upper and lower surfaces and the strip steel inertia moment.
Optionally, the cooling amplitude determining unit for the strip steel cooling affected area specifically includes:
the reynolds number determining subunit is used for determining the reynolds number of the cooling gas of the cooling nozzle according to the actual nozzle output information;
the cooling nozzle coefficient determining subunit is used for determining the cooling nozzle coefficient according to the actual vertical distance distribution between the nozzle and the strip steel;
a Knudel number determining subunit for determining the Knudel number according to the Reynolds number of the cooling gas and the coefficient of the cooling nozzle;
the strip steel surface heat exchange coefficient determining subunit is used for determining the strip steel surface heat exchange coefficient according to the Knudsen number and the equipment parameters;
and the strip steel cooling affected zone cooling amplitude determining subunit is used for determining the strip steel cooling affected zone cooling amplitude according to the strip steel surface heat exchange coefficient.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the optimization method and the optimization system for the cooling process of the fan of the galvanizing unit, the problem of C warping of strip steel is considered from the equipment process, and the cooling fan parameters are optimized by taking the average warping inhibition rate of the C warping of the strip steel corresponding to the nozzles in each section in the cooling process and the average warping sensitivity of the C warping of the strip steel corresponding to the nozzles in each section in the cooling process as objective functions, so that the problem of high warping incidence rate of the strip steel at the outlet of the unit is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a method for optimizing a fan cooling process of a galvanizing unit according to the present invention;
FIG. 2 is a schematic diagram of the establishment of the strip steel coordinates provided by the present invention;
FIG. 3 is a simplified mechanical model diagram for calculating the sag of the strip steel between adjacent furnace rollers provided by the invention;
FIG. 4 is a flow chart of the optimization method for the cooling process of the fan of the galvanizing unit in practical application;
FIG. 5 is a schematic view of a system suitable for optimizing a fan cooling process of a galvanizing unit provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a fan cooling process optimization method and system suitable for a galvanizing unit so as to solve the problem of high warping incidence rate of strip steel at the outlet of the unit.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
As shown in fig. 1, the method for optimizing the cooling process of the fan of the galvanizing unit provided by the invention comprises the following steps:
step 101: acquiring equipment parameters and process parameters of a galvanizing unit in a cooling process; the equipment parameters comprise the size of a nozzle, the specification of incoming strip steel, physical parameters and mechanical property parameters; the technological parameters comprise belt speed, strip steel tension, upper surface temperature and lower surface temperature before strip steel enters a cooling section, furnace temperature of the cooling section and plate shape warping distribution of an upstream technological section.
Step 102: and setting the maximum cooling amplitude, the warping inhibition initial value information and the pressure initial value information of the strip steel.
Step 103: determining output information according to the equipment parameters and the pressure initial value information; the output information comprises a pressure output value, an upper wind box output total flow, a lower wind box output total flow and each section nozzle output maximum flow.
Step 104: and setting initial flow regulation information.
Step 105: and determining the genetic plate shape warping direction of the strip steel of each section according to the process parameters.
Step 106: and determining actual nozzle output information according to the genetic plate shape warping direction and the output information of the strip steel of each section.
Step 107: and determining the cooling amplitude of the strip steel cooling affected area according to the actual nozzle output information and the equipment parameters. Step 107, specifically including:
and determining the sagging amount of the strip steel between the two furnace rollers according to the actual nozzle output information and the equipment parameters. Determining the sagging amount of the strip steel between two furnace rollers according to the actual nozzle output information and the equipment parameters, and specifically comprising the following steps: determining the pressure of the strip steel acted by the gas flowing out of the nozzle according to the actual nozzle output information; determining a half-width value, a gravity equivalent load concentration, an upper and lower surface unbalanced wind equivalent concentrated load and a strip steel inertia moment of a cooling affected area according to equipment parameters; and determining the sagging amount of the strip steel between the two furnace rollers according to the pressure of the gas flowing out from the nozzle on the strip steel, the half-width value of a cooling affected area, the gravity equivalent load concentration, the wind equivalent concentrated load with unbalanced upper and lower surfaces and the inertia moment of the strip steel.
And determining the actual vertical distance distribution between the nozzles and the strip steel according to the sagging amount of the strip steel between the two furnace rollers and the genetic plate shape warping direction of the strip steel in each section.
And determining the cooling amplitude of the strip steel cooling affected zone by using a jet flow cooling model according to the actual vertical distance distribution between the nozzle and the strip steel. According to actual vertical distance distribution between nozzle and belted steel, utilize efflux cooling model to confirm belted steel cooling influence district cooling range, specifically include: determining the Reynolds number of the cooling gas of the cooling nozzle according to the actual nozzle output information; determining the coefficient of the cooling nozzle according to the actual vertical distance distribution between the nozzle and the strip steel; determining the Nussel number according to the Reynolds number of the cooling gas and the coefficient of the cooling nozzle; determining the heat exchange coefficient of the surface of the strip steel according to the Nossel number and the equipment parameters; and determining the cooling amplitude of the strip steel cooling affected zone according to the surface heat exchange coefficient of the strip steel.
Step 108: and determining the warping distribution of the cooled strip steel according to the cooling amplitude of the strip steel cooling affected area and the maximum cooling amplitude of the strip steel. Step 108, specifically comprising:
and judging whether the cooling amplitude of the strip steel cooling affected area is smaller than or equal to the maximum cooling amplitude of the strip steel, if so, determining the warping distribution of the cooled strip steel according to the process parameters, and if not, returning to the step of setting the maximum cooling amplitude of the strip steel, the warping inhibition initial value information and the pressure initial value information.
Step 109: determining the warping average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process according to the warping distribution of the cooled strip steel; the warping average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process comprises warping average warping inhibition rate of the strip steel C corresponding to the nozzles of each section in the cooling process and warping average warping sensitivity of the strip steel C corresponding to the nozzles of each section in the cooling process. Step 109, specifically including: determining the warping average warping inhibition rate of the strip steel C corresponding to the nozzles of each section in the cooling process according to the warping distribution of the cooled strip steel; determining the average output flow of the nozzles according to the actual output information of the nozzles; determining the relative difference of the average output flow of the cooling nozzles according to the average output flow of the nozzles; and determining the warping average warping inhibition sensitivity of the strip steel C corresponding to the nozzles of each section in the cooling process according to the relative difference of the average output flow of the cooling nozzles.
Step 110: and finishing the parameter optimization of the cooling fan according to the warping average warping information, warping inhibition initial value information and flow initial adjustment information of the strip steel C corresponding to the nozzles of each section in the cooling process.
The method provided by the invention takes two quantitative indexes for controlling the warping in the cooling process of the strip steel as objective functions: the average warping inhibition rate and the average warping inhibition sensitivity are optimized for the distribution of the pressure of a cooling fan, the total gas output flow and the flow of gas sprayed by a cooling nozzle, the surface temperature distribution of the strip steel is optimized, wherein the coordinates of the strip steel are shown in figure 2 and figure 4, and the specific technical scheme is as follows:
A) collecting the equipment parameters of the galvanizing unit in the cooling process, including the nozzle size: transverse length l of each sectional nozzle, longitudinal width b of nozzle0The theoretical distance Z between the nozzle and the surface of the strip steel0Number of nozzle segments M, fan output P0Efficiency eta of fan transmission devicerEfficiency η of fanf(ii) a The specification of incoming strip steel, physical parameters and mechanical property parameters thereof comprise width B, thickness H, strip density rho, and material average linear expansion coefficient in a cooling environment
Figure BDA0003212500060000092
Strip thermal conductivity lambda in a cooled environmentaThe average specific heat capacity c of the strip, the elastic modulus E of the strip at normal temperature and the yield strength sigma of the strip at normal temperature in the cooling processsAnd the modulus of elasticity of the strip material in the environment of the cooling process section is reduced by the coefficient chiTAnd yield strength reduction coefficient eta of strip in cooling process section environmentTCooling gas density rho in a cooling environmenta。
B) Collecting technological parameters of cooling process including strip speed V, strip steel tension F, strip steel upper surface temperature T before entering cooling sectionsThe temperature T of the front lower surface of the strip steel entering the cooling sectionxTemperature T of furnace in cooling sectionfUpstream process section plate shape warp profile w0(y), setting the segment number i to 1.
C) Setting the maximum cooling amplitude Delta T of the strip steelA0Allowable value of warpage suppressing rate theta*Initial value of maximum value of sensitivity for suppressing warpagemaxAnd 0, and the initial value k of the pressure optimization process variable k is 0.
D) Setting an initial value p of fan output pressure0Incremental pressure Δ p, number of pressure optimization steps Np；
E) Calculating the pressure output value p and the total flow Q output by the upper wind boxs0Lower wind box output total flow Qx0Each zone nozzle outputting a maximum flow, wherein QsmaxFor maximum flow output of nozzles in each section, QxmaxThe lower nozzle of each section outputs the maximum flow.
E1) Calculating a pressure output value p ═ p0+k·Δp。
E2) Calculate the total flow of the wind box output
Figure BDA0003212500060000091
E3) Calculating the maximum flow output of the zone nozzle
Figure BDA0003212500060000101
F) Setting the initial value j of the flow regulating variable to be 0 and the flow optimizing step number NQCalculating incremental change of flow
Figure BDA0003212500060000102
G) Judging the genetic plate shape warping direction of the strip steel in each section: w is a0(y) ≧ 0? If yes, go to H1); if not, the routine proceeds to H2).
H) Calculating the actual output flow of the nozzle and the flow velocity of the upper nozzle and the lower nozzle:
H1) calculating the output flow Q of the nozzles＝Qsmax-j·ΔQ、Qx＝QxmaxAnd the output flow rate of the upper and lower nozzles
Figure BDA0003212500060000103
Where a is a coefficient relating to the nozzle shape, the outlet flow velocity, and the flow pattern characteristics.
H2) Calculating the actual output flow Q of the nozzles＝Qsmax、Qx＝Qxmax-j.DELTA.Q, and upper and lower nozzle output flow rates
Figure BDA0003212500060000104
Where a is a coefficient relating to the nozzle shape, the outlet flow velocity, and the flow pattern characteristics.
I) Calculating the sag theta of the strip steel between the two furnace rollers
I1) Calculating the pressure p of the upper and lower surfaces of the strip steel acted by the gas discharged from the nozzlems＝ρaus 2、pmx＝ρaux 2Pressure difference delta p between upper surface and lower surface of strip steelm＝pms-pmxHalf width value X of cooling influence region omegac＝κb0Gravity equivalent load concentration q1Equal rho gH, wind power equivalent concentrated load q with unbalanced upper and lower surfaces2＝ΔpmXcMoment of inertia of strip in y' direction
Figure BDA0003212500060000105
In the formula, ρaTo cool the gas density in a cooling environment.
I2) Calculating the sag theta (x') of the strip steel at each position between the furnace rollers
Figure BDA0003212500060000111
Wherein g is gravitational acceleration (kg/m.s.)2)；Iy′Is the inertia moment (mm) of the strip steel along the y' direction4) (ii) a Kappa is the nozzle outlet flow velocity and flow state characteristic coefficient; l is0The distance (mm) between adjacent furnace rollers; x 'and y' are local coordinates along the longitudinal direction and the transverse direction of the strip steel respectively; q. q.s1Is gravity equivalent load concentration; q. q.s2The wind power equivalent concentrated load with unbalanced upper and lower surfaces is obtained; chi shapeTThe reduction coefficient of the elastic modulus of the strip material under the environment of the cooling process section; e is the elastic modulus of the strip material at normal temperature.
J) Calculating the actual vertical distance distribution Z between the upper nozzle and the strip steels＝Z0+θ(x′)-w0(y) actual vertical distance distribution Z between lower nozzle and stripx＝Z0-θ(x′)+w0(y)。
In the formula, ZsThe actual vertical distance (mm) between the cooling nozzle and the upper surface of the strip steel; zxThe actual vertical distance (mm) between the cooling nozzle and the lower surface of the strip steel.
K) And (4) calculating the omega cooling amplitude of the strip steel cooling affected zone according to the jet cooling model. Wherein, Delta TsAFor the cooling amplitude, Delta T, of the upper surface of the stripxAThe lower surface is cooled.
K1) Reynolds number of cooling gas for upper and lower cooling nozzles
Figure BDA0003212500060000112
Wherein gamma is kinematic viscosity (mm) of cooling gas2/s)。
K2) Upper and lower cooling nozzle coefficients
Figure BDA0003212500060000113
Figure BDA0003212500060000114
In the formula, XcHalf width value (mm) of cooling affected zone Ω; zsThe actual vertical distance (mm) between the cooling nozzle and the upper surface of the strip steel; zxThe actual vertical distance (mm) between the cooling nozzle and the lower surface of the strip steel; b0Is the nozzle longitudinal width (mm).
K3) Upper and lower cooling nozzles 2b0Nussel number as characteristic length
Figure BDA0003212500060000115
Wherein γ is kinematic viscosity (mm) of cooling gas2S); pr is the Plantt number; kappa is the nozzle outlet flow velocity and flow state characteristic coefficient; res、RexReynolds numbers of the cooling gas of the upper and lower cooling nozzles.
K4) Calculating the heat exchange coefficient of the upper surface and the lower surface of the strip steel
Figure BDA0003212500060000121
K5) Calculating omega temperature of strip steel cooling affected zoneAmplitude of variation Δ TsA、ΔTxA：
Figure BDA0003212500060000122
Figure BDA0003212500060000123
Judged as Δ TsA≤ΔTA0And Δ TxA≤ΔTA0Is there no? If yes, turning to M); if not, the operation goes to D).
M) determining the warping distribution w (y) of the strip steel after cooling.
M1) calculating the plastic deformation of the upper and lower surfaces of the strip steel
Figure BDA0003212500060000124
Figure BDA0003212500060000125
Wherein Λ is the maximum elastic deformation function of the strip.
M2) calculating the maximum plastic strain difference epsilon of the upper surface and the lower surfaceB＝εs-εx。
M3) determining the warpage distribution of the strip after cooling
Figure BDA0003212500060000126
Wherein y is a transverse coordinate along the surface of the strip steel.
In the formula, Λ (T, F) is the maximum elastic deformation function of the strip material and is related to factors such as the temperature T, the tension F and the like of the strip material, and Λ ═ etaTσs/χTE+ψμF/BHχTE) In that respect ψ is a temperature-dependent coefficient, and μ is a poisson's ratio.
N) calculating the average warping inhibition rate of the strip steel C corresponding to the nozzles of each section in the cooling process
Figure BDA0003212500060000127
Average warpage suppressing sensitivity
Figure BDA0003212500060000128
N1) cold calculationAverage warping inhibition rate of strip steel C corresponding to nozzles of each section in cooling process
Figure BDA0003212500060000129
N2) calculating the average output flow of the upper and lower nozzles
Figure BDA00032125000600001210
Determining the maximum average flow of the upper and lower surfaces
Figure BDA00032125000600001211
Calculating the average output flow relative difference of the upper and lower cooling nozzles corresponding to the cooling region
Figure BDA0003212500060000131
Figure BDA0003212500060000132
The average flow rate difference of the cooling gas sprayed out from the upper and lower cooling nozzles.
N3) calculating average warp suppression sensitivity
Figure BDA0003212500060000133
O) judgment
Figure BDA0003212500060000134
Is there any? If yes, go to P1); if not, the routine proceeds to P2).
P1) judgment
Figure BDA0003212500060000135
Is there any? If yes, turning to Q); if not, the routine proceeds to P2).
P2) judging j < NQIs there any? If yes, let j equal j +1, and go to F); if not, the routine proceeds to P3).
P3) judging k < NpIs there any? If yes, let k be k +1, and go to E); if not, the process is switched to R).
Q) order
Figure BDA0003212500060000136
R) output p,
Figure BDA0003212500060000137
S) judging whether i < M is true? If yes, making i equal to i +1, and turning to C); if not, the flow is ended.
The method can fully combine the equipment characteristics of the galvanizing unit according to the field production condition of the strip steel galvanizing, optimizes the key parameters of the cooling fan through the process parameters of the unit cooling process, and effectively solves the problem of high warping incidence rate of the strip steel at the unit outlet according to the optimization method and the process.
Example 2:
taking a certain aluminizing unit cooling process as an example, the fan key process parameters are optimized, and the optimization method of the aluminizing unit fan cooling process of the invention is explained in detail by combining fig. 3 and fig. 4.
Firstly, in the step A), collecting parameters of equipment in a cooling process of a galvanizing unit, wherein the parameters comprise the nozzle size: transverse length l of each sectional nozzle, longitudinal width b of nozzle0The theoretical distance Z between the nozzle and the surface of the strip steel0Number of nozzle segments M, fan output P0Efficiency eta of fan transmission devicerEfficiency η of fanf(ii) a The specification of incoming strip steel, physical parameters and mechanical property parameters thereof comprise width B, thickness H, strip density rho, and material average linear expansion coefficient in a cooling environment
Figure BDA0003212500060000138
Strip thermal conductivity lambda in a cooled environmentaThe average specific heat capacity c of the strip, the elastic modulus E of the strip at normal temperature and the yield strength sigma of the strip at normal temperature in the cooling processsAnd the modulus of elasticity of the strip material in the environment of the cooling process section is reduced by the coefficient chiTAnd yield strength reduction coefficient eta of strip in cooling process section environmentTCooling gas density rho in a cooling environmenta. The galvanizing rig equipment parameters are shown in tables 1 and 2.
Table 1 example 2 galvanizing unit equipment parameters
Name (R) Numerical value
Number of nozzle stages M 3
Transverse length l/mm of nozzle 300,700,300
Longitudinal width b of nozzle0/mm 25
Theoretical distance Z between nozzle and surface of strip steel0/mm 150
Efficiency eta of fan transmissionr 80％
Efficiency η of the fanf 91％
Output power P of fan0/kW 100
Table 2 example 2 strip steel related parameters
Figure BDA0003212500060000141
Then in step B), collecting technological parameters of the cooling process, including strip speed V, strip steel tension F, and strip steel upper and lower surface temperature T before entering the cooling sections、TxTemperature T of furnace in cooling sectionfUpstream process section plate shape warp profile w0(y), set segment number i to 1, as shown in table 3.
Table 3 example 2 galvanizing unit cooling section process parameters
Figure BDA0003212500060000151
Then in step C), setting the maximum cooling amplitude Delta T of the strip steelA0240, allowable warpage suppression ratio Θ*60%, initial value δ of maximum value of warpage suppressing sensitivitymaxAnd 0, and 0 is the initial value k of the pressure optimization process variable.
Then in step D), setting an initial value p of the output pressure of the fan0600Pa, 50Pa for increasing pressure increment delta p, and optimized number of pressure steps Np＝12。
Subsequently, in step E), the pressure output value p ═ p is calculated0600Pa, total flow Q of upper and lower bellowss0＝Qx094.79, each zone nozzle outputs the maximum flow Qsmax＝Qxmax＝31.59m3/min。
Subsequently, in step F), the initial value j of the flow rate control variable is set to 0 and the flow rate optimization step number N is setQThe calculated incremental flow Δ Q is 15m at 203/min。
And G), judging the genetic plate shape warping direction of the strip steel of each section: w is a0(y) ≧ 0? If yes, go to H1); if not, the routine proceeds to H2).
Subsequently in step H1), the nozzle output flow Q is calculateds＝Qx＝31.59m3Min, and upper and lower nozzle output flow rate us＝ux＝288m/min。
Subsequently in step I1), the nozzle outflow is calculatedPressure p of upper and lower surfaces of strip steel under gas actionms＝ρaus 2＝11.52Pa、pmx＝ρaux 2Pressure difference delta p between upper surface and lower surface of the steel strip of 11.52Pa m0, half width value X of cooling influence region Ωc＝κb022.5mm, gravity equivalent load density q1Rho gH 76.44Pa, wind power equivalent concentrated load q with unbalanced upper and lower surfaces2＝ΔpmXcMoment of inertia of the strip in the y' direction (0)
Figure BDA0003212500060000161
L0＝5mm。
Subsequently, in step I2), the sagging amount theta of the strip steel between the two furnace rollers is calculated.
Figure BDA0003212500060000162
Wherein g is the acceleration of gravity; i isy′The inertia moment of the strip steel along the y' direction; kappa is the nozzle outlet flow velocity and flow state characteristic coefficient; l is0Is the distance between adjacent furnace rollers.
Then, in step J), the actual vertical distance distribution between the upper nozzle and the lower nozzle and the strip steel is calculated:
Figure BDA0003212500060000163
in the formula, ZsThe actual vertical distance (mm) between the cooling nozzle and the upper surface of the strip steel; zxThe actual vertical distance (mm) between the cooling nozzle and the lower surface of the strip steel.
Then in the step K), the variation amplitude delta T of the omega temperature of the strip steel cooling influence area is calculated according to the jet flow cooling modelsA＝14℃、ΔTxA＝19℃。
Subsequently in step L), it is judged to be Δ TsA≤ΔTA0And Δ TxA≤ΔTA0Is there no? If yes, turning to M); if not, the operation goes to D).
Subsequently, in the step M), calculating the warping distribution w (y) of the strip steel after cooling
Figure BDA0003212500060000164
In the formula, epsilonsThe plastic strain of the upper surface of the strip steel; epsilonxThe lower surface plastic strain of the strip steel is measured; lambda (T, F) is a maximum elastic deformation function of the strip material and is related to factors such as the temperature T, the tension F and the like of the strip material, and Lambda ═ etaTσs/χTE+ψμF/BHχTE)；εBThe maximum plastic strain difference of the upper surface and the lower surface of the strip material is shown.
Then in the step N), calculating the average warping inhibition rate of the strip steel C corresponding to the nozzles of each section in the cooling process
Figure BDA0003212500060000171
Average warpage suppressing sensitivity
Figure BDA0003212500060000172
Subsequently in step O), judging
Figure BDA0003212500060000173
Is there any? If yes, go to P1); if not, the routine proceeds to P2).
Subsequently in step P1), a judgment is made
Figure BDA0003212500060000174
Is there any? If yes, turning to Q); if not, the routine proceeds to P2).
Subsequently, in step P2), j < N is judgedQIs there any? If yes, let j equal j +1, and go to F); if not, the routine proceeds to P3).
Subsequently, in step P3), it is judged that k < NpIs there any? If yes, let k be k +1, and go to E); if not, the process is switched to R).
Subsequently in a step Q), let
Figure BDA0003212500060000175
Then in step R), the output p 980Pa, Qs＝58m3/min、Qx＝62m3/min。
Subsequently in step S), it is determined whether i < M? If yes, making i equal to i +1, and turning to C);
if not, ending the flow; and analogizing, and continuously circulating until i is equal to 3.
Table 4 optimization of cooling fan process parameters in example 2
Figure BDA0003212500060000176
Table 5 comparison of cooling fan process parameters before and after optimization in example 2
Before optimization After optimization
Amount of warpage/mm 20 9
Table 4 shows the flow rates of the cooling gas output from the upper and lower cooling nozzles after the optimization calculation of the above process, and the amount of warping of the strip steel after the unit is discharged is shown in table 5 after the process parameters in table 4 are utilized, so that the strip steel can be effectively reduced.
Example 3:
firstly, in the step A), the first step,collecting the equipment parameters of the galvanizing unit in the cooling process, including the nozzle size: transverse length l of each sectional nozzle, longitudinal width b of nozzle0The theoretical distance Z between the nozzle and the surface of the strip steel0Number of nozzle segments M, fan output P0Efficiency eta of fan transmission devicerEfficiency η of fanf(ii) a The specification of incoming strip steel, physical parameters and mechanical property parameters thereof comprise width B, thickness H, strip density rho, and material average linear expansion coefficient in a cooling environment
Figure BDA0003212500060000181
Strip thermal conductivity lambda in a cooled environmentaThe average specific heat capacity c of the strip, the elastic modulus E of the strip at normal temperature and the yield strength sigma of the strip at normal temperature in the cooling processsAnd the modulus of elasticity of the strip material in the environment of the cooling process section is reduced by the coefficient chiTAnd yield strength reduction coefficient eta of strip in cooling process section environmentTCooling gas density rho in a cooling environmenta. As shown in tables 6-7.
Table 6 example 3 galvanizing unit equipment parameters
Name (R) Numerical value
Number of nozzle stages M 3
Transverse length l/mm of nozzle 300,700,300
Longitudinal width b of nozzle0/mm 25
Nozzle distance strip steel meterTheoretical distance Z0/mm 150
Efficiency eta of fan transmissionr 80％
Efficiency η of the fanf 91％
Output power P of fan0/kW 100
Table 7 example 3 strip steel related parameters
Figure BDA0003212500060000182
Figure BDA0003212500060000191
Then in step B), collecting technological parameters of the cooling process, including strip speed V, strip steel tension F, and strip steel upper and lower surface temperature T before entering the cooling sections、TxTemperature T of furnace in cooling sectionfUpstream process section plate shape warp profile w0(y), setting the segment number i to 1; as shown in table 8.
Table 8 example 3 galvanizing unit cooling section process parameters
Name (R) Numerical value
Belt speed V/(m/min) 58
Strip steel tension F/KN 13
Temperature T of upper and lower surfaces before entering cooling sections、Tx/℃ 660、674
Temperature T of cooling zone furnacef/℃ 180
Upstream process segment genetic plate shape warp profile w0(y)/mm 34+0.85y2
Then in step C), setting the maximum cooling amplitude Delta T of the strip steelA0240, allowable warpage suppression ratio Θ*72%, initial value δ of maximum value of warpage-suppressing sensitivitymaxAnd 0, and 0 is the initial value k of the pressure optimization process variable.
Then in step D), setting an initial value p of the output pressure of the fan0650Pa, 50Pa for increasing pressure increment, and optimized number of pressure steps Np＝13。
Subsequently, in step E), the actual pressure output value p ═ p is calculated0650Pa, total flow Q of upper and lower bellowss0＝Qx0102.35, each zone nozzle outputs a maximum flow rate Qsmax＝Qxmax＝45.52m3/min。
Subsequently, in step F), the initial value j of the flow rate control variable is set to 0 and the flow rate optimization step number N is setQAt 18, the incremental flow Δ Q was calculated at 17m 3/min.
And G), judging the genetic plate shape warping direction of the strip steel of each section: w is a0(y) ≧ 0? If yes, go to H1); if not, the routine proceeds to H2).
Subsequently in step H1), the nozzle actual output flow Q is calculateds＝Qx＝45.52m3Min, and upper and lower nozzle output flow rate us＝ux＝263m/min。
Subsequently, in step I1), the pressure p of the gas from the nozzles acting on the upper and lower surfaces of the strip is calculatedms＝ρaus 2＝15.52Pa、pmx＝ρaux 215.52Pa, pressure difference delta p between the upper surface and the lower surface of the strip steel m0, half width value X of cooling influence region Ωc＝κb025.2mm, gravity equivalent load density q179.78Pa, and the wind power equivalent concentrated load q with unbalanced upper and lower surfaces2＝ΔpmXcMoment of inertia of the strip in the y' direction (0)
Figure BDA0003212500060000201
L0＝5mm。
Subsequently, in step I2), the amount of strip sagging θ between the two furnace rolls is calculated:
Figure BDA0003212500060000202
wherein g is the acceleration of gravity; i isy′-moment of inertia of the strip in the y' direction; kappa-nozzle outlet flow velocity and flow state characteristic coefficient; l is0-spacing of adjacent furnace rolls.
Then in step J), calculating the actual vertical distance distribution between the upper and lower nozzles and the strip steel
Figure BDA0003212500060000203
In the formula, ZsThe actual perpendicular distance (mm) of the cooling nozzles from the upper surface of the strip.
Zx-the actual perpendicular distance (mm) of the cooling nozzles from the lower surface of the strip.
Then in the step K), the omega cooling amplitude delta T of the strip steel cooling influence area is calculated according to the jet flow cooling modelsA＝12℃、ΔTxA＝15℃。
Subsequently in step L), it is judged to be Δ TsA≤ΔTA0And Δ TxA≤ΔTA0Is there no? If yes, turning to M); if not, the operation goes to D).
Subsequently, in the step M), calculating the warping distribution w (y) of the strip steel after cooling
Figure BDA0003212500060000211
In the formula, epsilons-plastic strain on the upper surface of the strip steel; epsilonx-plastic strain of the lower surface of the strip steel; lambda (T, F) -maximum elastic deformation function of the strip, dependent on factors such as temperature T, tension F, etc. of the strip, lambda (eta ═ eta)Tσs/χTE+ψμF/BHχTE)；εBMaximum difference in plastic strain of the upper and lower surfaces of the strip.
Then in the step N), calculating the average warping inhibition rate of the strip steel C corresponding to the nozzles of each section in the cooling process
Figure BDA0003212500060000212
Average warpage suppressing sensitivity
Figure BDA0003212500060000213
Subsequently in step O), judging
Figure BDA0003212500060000214
Is there any? If yes, go to P1); if not, the routine proceeds to P2).
Subsequently in step P1), a judgment is made
Figure BDA0003212500060000215
Is there any? If yes, turning to Q); if not, the routine proceeds to P2).
Subsequently in step P2)And j < NQIs there any? If yes, let j equal j +1, and go to F); if not, the routine proceeds to P3).
Subsequently, in step P3), it is judged that k < NpIs there any? If yes, let k be k +1, and go to E); if not, the process is switched to R).
Subsequently in a step Q), let
Figure BDA0003212500060000216
Then in step R), the output p 910Pa, Qs＝62m3/min、Qx＝70m3/min。
Subsequently in step S), it is determined whether i < M? If yes, making i equal to i +1, and turning to C); if not, ending the flow; and repeating the steps until i is equal to 3.
Table 9 optimization of cooling fan process parameters in example 3
Figure BDA0003212500060000217
Figure BDA0003212500060000221
Table 10 comparison of cooling fan process parameters before and after optimization in example 3
Before optimization After optimization
Amount of warpage/mm 34 12
Table 9 shows the flow rates of the cooling gas output from the upper and lower cooling nozzles after the optimization calculation of the above process, and the amount of warp of the strip steel after the unit is discharged is shown in table 10 after the process parameters in table 9 are used, so that the strip steel can be effectively reduced.
Example 4
As shown in fig. 5, the present invention provides a system suitable for optimizing a fan cooling process of a galvanizing unit, which includes:
an obtaining module 501, configured to obtain equipment parameters and process parameters of a galvanizing unit in a cooling process; the equipment parameters comprise the size of a nozzle, the specification of incoming strip steel, physical parameters and mechanical property parameters; the technological parameters comprise belt speed, strip steel tension, upper surface temperature and lower surface temperature before strip steel enters a cooling section, furnace temperature of the cooling section and plate shape warping distribution of an upstream technological section.
The first setting module 502 is configured to set a maximum cooling amplitude of the strip steel, initial value information of warp suppression, and initial value information of pressure.
An output information determining module 503, configured to determine output information according to the device parameter and the pressure initial value information; the output information comprises a pressure output value, an upper wind box output total flow, a lower wind box output total flow and each section nozzle output maximum flow.
And a second setting module 504, configured to set initial flow adjustment information.
And the warping direction determining module 505 for determining the warping direction of the genetic plate shape of the strip steel in each section according to the process parameters.
And an actual nozzle output information determining module 506, configured to determine actual nozzle output information according to the strip steel genetic board shape warping direction and the output information of each section.
And a strip steel cooling affected zone cooling amplitude determining module 507, configured to determine a strip steel cooling affected zone cooling amplitude according to the actual nozzle output information and the equipment parameter.
And a cooled strip steel warpage distribution determining module 508, configured to determine the cooled strip steel warpage distribution according to the strip steel cooling influence area cooling amplitude and the strip steel maximum cooling amplitude.
The determination module 509 for determining the warping average warping information of the strip steel C corresponding to each section nozzle in the cooling process is used for determining the warping average warping information of the strip steel C corresponding to each section nozzle in the cooling process according to the warping distribution of the cooled strip steel; the warping average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process comprises warping average warping inhibition rate of the strip steel C corresponding to the nozzles of each section in the cooling process and warping average warping sensitivity of the strip steel C corresponding to the nozzles of each section in the cooling process.
And the cooling fan parameter optimization module 510 is configured to complete cooling fan parameter optimization according to the average warping information, the warping inhibition initial value information, and the initial flow adjustment information of the strip steel C corresponding to each nozzle section in the cooling process.
Wherein, belted steel cooling affected zone cooling range confirms module 507, specifically includes:
the device comprises a furnace roller and a furnace roller inter-roll strip steel sag determining unit, wherein the furnace roller inter-roll strip steel sag determining unit is used for determining the furnace roller inter-roll strip steel sag according to actual nozzle output information and equipment parameters; wherein, belted steel sag amount confirms the unit between two stove rollers, specifically includes: the pressure subunit of the strip steel acted by the gas flowing out of the nozzle is used for determining the pressure of the strip steel acted by the gas flowing out of the nozzle according to the output information of the actual nozzle; the first determining subunit is used for determining the half-width value, the gravity equivalent load concentration, the wind power equivalent concentrated load with unbalanced upper and lower surfaces and the strip steel inertia moment of the cooling affected area according to the equipment parameters; and the strip steel sagging amount determining subunit is used for determining the strip steel sagging amount between the two furnace rollers according to the pressure of the strip steel acted by the gas flowing out of the nozzle, the half-width value of the cooling affected area, the gravity equivalent load concentration, the wind equivalent concentrated load with unbalanced upper and lower surfaces and the strip steel inertia moment.
And the actual vertical distance distribution determining unit is used for determining the actual vertical distance distribution between the nozzles and the strip steel according to the sagging amount of the strip steel between the two furnace rollers and the genetic plate shape warping direction of the strip steel in each section.
And the strip steel cooling affected zone cooling amplitude determining unit is used for determining the strip steel cooling affected zone cooling amplitude by utilizing the jet flow cooling model according to the actual vertical distance distribution between the nozzles and the strip steel. Wherein, belted steel cooling influence district cooling range confirms the unit, specifically includes: the reynolds number determining subunit is used for determining the reynolds number of the cooling gas of the cooling nozzle according to the actual nozzle output information; the cooling nozzle coefficient determining subunit is used for determining the cooling nozzle coefficient according to the actual vertical distance distribution between the nozzle and the strip steel; the Knudel number determining subunit is used for determining the Knudel number according to the Reynolds number of the cooling gas and the coefficient of the cooling nozzle; the strip steel surface heat exchange coefficient determining subunit is used for determining the strip steel surface heat exchange coefficient according to the Knudsen number and the equipment parameters; and the strip steel cooling affected zone cooling amplitude determining subunit is used for determining the strip steel cooling affected zone cooling amplitude according to the strip steel surface heat exchange coefficient.
The invention fully combines the equipment characteristics of the galvanizing unit, starts from the angle of equipment technology, considers the problem of C warping caused by the combined action of longitudinal tensile stress and thermal stress on the strip steel in the continuous annealing furnace, realizes the segmented cooling of the surface of the strip steel by adjusting the output pressure, the outlet flow control and the flow distribution along the transverse direction of the strip steel on a cooling fan system in the continuous annealing furnace, finally realizes the optimal distribution of the temperature of the strip steel, reduces the nonuniformity of the transverse extension of the strip steel and reversely compensates the warping degree of the strip steel.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (10)

1. A method suitable for optimizing a cooling process of a fan of a galvanizing unit is characterized by comprising the following steps:
acquiring equipment parameters and process parameters of a galvanizing unit in a cooling process; the equipment parameters comprise the size of a nozzle, the specification of incoming strip steel, physical parameters and mechanical property parameters; the process parameters comprise belt speed, strip steel tension, upper surface temperature and lower surface temperature before strip steel enters a cooling section, furnace temperature of the cooling section and plate shape warping distribution of an upstream process section;
setting the maximum cooling amplitude, warping inhibition initial value information and pressure initial value information of the strip steel;
determining output information according to the equipment parameters and the pressure initial value information; the output information comprises a pressure output value, an upper wind box output total flow, a lower wind box output total flow and each section nozzle output maximum flow;
setting initial flow regulation information;
determining the genetic plate shape warping direction of the strip steel of each section according to the process parameters;
determining actual nozzle output information according to the strip steel genetic plate shape warping direction and the output information of each section;
determining the cooling amplitude of the strip steel cooling affected area according to the actual nozzle output information and the equipment parameters;
determining the warping distribution of the cooled strip steel according to the cooling amplitude of the strip steel cooling affected area and the maximum cooling amplitude of the strip steel;
determining the warping average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process according to the warping distribution of the cooled strip steel; the warping average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process comprises warping average warping inhibition rate of the strip steel C corresponding to the nozzles of each section in the cooling process and warping average warping sensitivity of the strip steel C corresponding to the nozzles of each section in the cooling process;
and finishing the parameter optimization of the cooling fan according to the warping average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process, the warping inhibition initial value information and the flow initial adjustment information.
2. The optimization method suitable for the cooling process of the fan of the galvanizing unit according to claim 1, wherein the determining of the cooling amplitude of the strip steel cooling affected zone according to the actual nozzle output information and the equipment parameters specifically comprises:
determining the sagging amount of the strip steel between the two furnace rollers according to the actual nozzle output information and the equipment parameters;
determining the actual vertical distance distribution between the nozzles and the strip steel according to the sagging amount of the strip steel between the two furnace rollers and the genetic plate shape warping direction of the strip steel in each section;
and determining the cooling amplitude of the strip steel cooling affected area by using a jet flow cooling model according to the actual vertical distance distribution between the nozzle and the strip steel.
3. The optimization method suitable for the fan cooling process of the galvanizing unit according to claim 2, wherein the determining of the sagging amount of the strip steel between the two furnaces according to the actual nozzle output information and the equipment parameters specifically comprises:
determining the pressure of the strip steel acted by the gas flowing out of the nozzle according to the actual nozzle output information;
determining a half-width value, a gravity equivalent load concentration, an upper and lower surface unbalanced wind equivalent concentrated load and a strip steel inertia moment of a cooling affected area according to the equipment parameters;
and determining the sagging amount of the strip steel between the two furnace rollers according to the pressure of the gas flowing out from the nozzle on the strip steel, the half-width value of the cooling affected area, the gravity equivalent load concentration, the wind equivalent concentrated loads with unbalanced upper and lower surfaces and the inertia moment of the strip steel.
4. The optimization method suitable for the cooling process of the fan of the galvanizing unit according to the claim 3, wherein the step of determining the cooling amplitude of the strip steel cooling affected zone by using a jet flow cooling model according to the actual vertical distance distribution between the nozzle and the strip steel specifically comprises the following steps:
determining the Reynolds number of the cooling gas of the cooling nozzle according to the actual nozzle output information;
determining the coefficient of the cooling nozzle according to the actual vertical distance distribution between the nozzle and the strip steel;
determining a Knudsen number from the cooling gas Reynolds number and the cooling nozzle coefficient;
determining the heat exchange coefficient of the surface of the strip steel according to the Knoop number and the equipment parameters;
and determining the cooling amplitude of the strip steel cooling affected area according to the surface heat exchange coefficient of the strip steel.
5. The optimization method suitable for the fan cooling process of the galvanizing unit according to claim 1, wherein the determining of the warpage distribution of the strip steel after cooling according to the cooling amplitude of the strip steel cooling affected area and the maximum cooling amplitude of the strip steel specifically comprises:
and judging whether the cooling amplitude of the strip steel cooling affected zone is smaller than or equal to the maximum cooling amplitude of the strip steel or not, if so, determining the warping distribution of the cooled strip steel according to the process parameters, and if not, returning to the step of setting the maximum cooling amplitude of the strip steel, warping inhibition initial value information and pressure initial value information.
6. The optimization method suitable for the cooling process of the fan of the galvanizing unit according to claim 1, wherein the determining of the average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process according to the warping distribution of the cooled strip steel specifically comprises:
determining the average warping inhibition rate of the strip steel C corresponding to the nozzles of each section in the cooling process according to the warping distribution of the cooled strip steel;
determining the average output flow of the nozzles according to the actual output information of the nozzles;
determining the relative difference of the average output flow of the cooling nozzles according to the average output flow of the nozzles;
and determining the warping average warping inhibition sensitivity of the strip steel C corresponding to the nozzles of each section in the cooling process according to the relative difference of the average output flow of the cooling nozzles.
7. A is suitable for galvanizing unit fan cooling technology optimization system, characterized by comprising:
the acquisition module is used for acquiring equipment parameters and process parameters of a galvanizing unit in a cooling process; the equipment parameters comprise the size of a nozzle, the specification of incoming strip steel, physical parameters and mechanical property parameters; the process parameters comprise belt speed, strip steel tension, upper surface temperature and lower surface temperature before strip steel enters a cooling section, furnace temperature of the cooling section and plate shape warping distribution of an upstream process section;
the first setting module is used for setting the maximum cooling amplitude, the warping inhibition initial value information and the pressure initial value information of the strip steel;
the output information determining module is used for determining output information according to the equipment parameters and the pressure initial value information; the output information comprises a pressure output value, an upper wind box output total flow, a lower wind box output total flow and each section nozzle output maximum flow;
the second setting module is used for setting initial flow regulation information;
the band steel genetic plate shape warping direction determining module is used for determining the band steel genetic plate shape warping direction of each section according to the process parameters;
the actual nozzle output information determining module is used for determining actual nozzle output information according to the strip steel genetic plate shape warping direction of each section and the output information;
the strip steel cooling affected area cooling amplitude determining module is used for determining the strip steel cooling affected area cooling amplitude according to the actual nozzle output information and the equipment parameters;
the cooled strip steel warpage distribution determining module is used for determining cooled strip steel warpage distribution according to the cooling amplitude of the strip steel cooling affected area and the maximum cooling amplitude of the strip steel;
the cooling process comprises a cooling process section nozzle and a cooling process section nozzle, wherein the cooling process section nozzle corresponds to a strip steel C warping average warping information determination module is used for determining the strip steel C warping average warping information corresponding to the cooling process section nozzle according to the cooled strip steel warping distribution; the warping average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process comprises warping average warping inhibition rate of the strip steel C corresponding to the nozzles of each section in the cooling process and warping average warping sensitivity of the strip steel C corresponding to the nozzles of each section in the cooling process;
and the cooling fan parameter optimization module is used for finishing cooling fan parameter optimization according to the average warping information of the strip steel C corresponding to the nozzles of each section in the cooling process, the warping inhibition initial value information and the flow initial adjustment information.
8. The system suitable for optimizing the cooling process of the fan of the galvanizing unit according to claim 7, wherein the module for determining the cooling amplitude of the strip steel cooling affected zone specifically comprises:
the device comprises a furnace roller and a furnace roller inter-roller strip steel sag determining unit, wherein the furnace roller inter-roller strip steel sag determining unit is used for determining the furnace roller inter-roller strip steel sag according to the actual nozzle output information and the equipment parameters;
the actual vertical distance distribution determining unit is used for determining the actual vertical distance distribution between the nozzles and the strip steel according to the sagging amount of the strip steel between the two furnace rollers and the genetic plate shape warping direction of the strip steel in each section;
and the strip steel cooling affected zone cooling amplitude determining unit is used for determining the strip steel cooling affected zone cooling amplitude by utilizing a jet flow cooling model according to the actual vertical distance distribution between the nozzle and the strip steel.
9. The optimization system suitable for the fan cooling process of the galvanizing unit according to claim 8, wherein the unit for determining the sagging amount of the strip steel between the two furnace rollers specifically comprises:
the pressure subunit of the strip steel acted by the gas flowing out of the nozzle is used for determining the pressure of the strip steel acted by the gas flowing out of the nozzle according to the actual nozzle output information;
the first determining subunit is used for determining the half-width value, the gravity equivalent load concentration, the wind power equivalent concentrated load with unbalanced upper and lower surfaces and the strip steel inertia moment of the cooling affected area according to the equipment parameters;
and the strip steel sagging amount determining subunit is used for determining the strip steel sagging amount between the two furnace rollers according to the pressure of the strip steel acted by the gas flowing out of the nozzle, the half-width value of the cooling influence area, the gravity equivalent load concentration, the wind power equivalent concentrated load with unbalanced upper and lower surfaces and the strip steel inertia moment.
10. The system suitable for optimizing the cooling process of the fan of the galvanizing unit according to claim 9, wherein the cooling amplitude determining unit for the strip steel cooling affected zone specifically comprises:
the reynolds number determining subunit is used for determining the reynolds number of the cooling gas of the cooling nozzle according to the actual nozzle output information;
the cooling nozzle coefficient determining subunit is used for determining the cooling nozzle coefficient according to the actual vertical distance distribution between the nozzle and the strip steel;
a Knudel number determining subunit for determining the Knudel number according to the Reynolds number of the cooling gas and the coefficient of the cooling nozzle;
the strip steel surface heat exchange coefficient determining subunit is used for determining the strip steel surface heat exchange coefficient according to the Knudsen number and the equipment parameters;
and the strip steel cooling affected zone cooling amplitude determining subunit is used for determining the strip steel cooling affected zone cooling amplitude according to the strip steel surface heat exchange coefficient.
CN202110934657.5A 2021-08-16 2021-08-16 Method and system suitable for optimizing cooling process of fan of galvanizing unit Pending CN113652622A (en)

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Application publication date: 20211116