CN111154965A - Calculation method suitable for strip steel temperature of rapid cooling section of continuous annealing unit - Google Patents
Calculation method suitable for strip steel temperature of rapid cooling section of continuous annealing unit Download PDFInfo
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- CN111154965A CN111154965A CN202010010289.0A CN202010010289A CN111154965A CN 111154965 A CN111154965 A CN 111154965A CN 202010010289 A CN202010010289 A CN 202010010289A CN 111154965 A CN111154965 A CN 111154965A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
- C21D9/5735—Details
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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Abstract
The invention discloses a calculation method suitable for the strip steel temperature of a rapid cooling section of a continuous annealing unit, belongs to the technical field of continuous annealing, solves the problems of how to effectively avoid measurement errors caused by the temperature detected by a sensor and realize accurate prediction of the performance of outlet strip steel, and comprises the steps of strip steel specific heat capacity c, strip steel mass m and strip steel entering temperature T of a rapid cooling arearAnd the comprehensive radiation coefficient C of the sample to the cooling wallLAverage temperature T of cooling gasbContact area S and furnace temperature TjCollecting parameters including gas ejection speed v, gas flow spacing l and the like; the quality of the finished product strip steel is predicted in advance by accurately predicting the outlet temperature of the strip steel of the rapid cooling section of the continuous annealing unit, and meanwhile, the inlet of the continuous annealing section can be predicted according to the outlet temperature of the strip steelThe temperature and the temperature in the furnace are adjusted and controlled in time to achieve the ideal strip steel outlet temperature, ensure the high-speed production of the continuous annealing unit, improve the production efficiency and increase the economic benefits of enterprises.
Description
Technical Field
The invention relates to the technical field of continuous annealing, in particular to a calculation method suitable for the strip steel temperature of a rapid cooling section of a continuous annealing unit.
Background
In recent years, with the rapid development of the industries of automobiles, household electrical appliances, electronics and packaging, the quality requirements of strip steel users on products are higher and higher. The strip steel produced by cold continuous rolling has the defect of work hardening due to continuous pressing of all the racks, so that the strip steel has high hardness and low plasticity, and is extremely not beneficial to subsequent processing and forming of cold-rolled strips. Therefore, the strip steel produced by cold continuous rolling often needs to be subjected to mechanical property adjustment and improvement through an annealing unit. Continuous annealing has the advantages of improving productivity and reducing labor cost due to continuous production operation, and is more and more favored in large-scale steel enterprises.
The key equipment of the continuous annealing unit is an annealing furnace, the furnace is divided into different process sections such as a preheating section, a heating section, a soaking section, a slow cooling section, a fast cooling section, an overaging section, a final cooling section and the like, wherein the fast cooling section can rapidly reduce the surface temperature of the strip steel, thereby playing an important role in improving the internal grain structure and size of the strip steel. At present, most of continuous annealing units are provided with a temperature sensor at the outlet of a cooling section to detect the temperature of strip steel at the outlet of a rapid cooling section, but in the actual production process, on one hand, the working environment of the temperature sensor is severe; on the other hand, as the service life of the sensor is increased, the temperature precision of the strip steel tested by the sensor is seriously interfered, so that misjudgment can be brought to an operator when the temperature with errors is transmitted to a computer interface of a field operator by the sensor, and after the process parameters of the cooling section are modified on the basis of the misjudgment, the mechanical property of the strip steel product at the continuous exit port is poor, and great economic loss is brought to an enterprise.
Therefore, how to establish a set of mathematical model suitable for forecasting the temperature of the strip steel at the rapid cooling section of the continuous annealing unit based on the running mechanism of the strip steel in the furnace effectively avoids the measurement error caused by the temperature detected by a sensor, and the accurate forecasting of the performance of the strip steel at the outlet becomes the key and difficult point of field technicians. Therefore, a set of continuous annealing unit rapid cooling section strip steel temperature calculation model is established, and effective prediction of the strip steel temperature in the actual production process is realized.
Disclosure of Invention
Aiming at the defects in the prior art, the embodiment of the invention aims to provide a calculation method suitable for the strip steel temperature of the rapid cooling section of a continuous annealing unit, so that the error problem caused by the fact that a temperature sensor detects the strip steel temperature is effectively avoided. The method has the advantages that the outlet temperature of the strip steel at the rapid cooling section of the continuous annealing unit is calculated, so that the accurate prediction of the quality of the finished product strip steel is realized, the quality of the final product is improved, and the unit brings great economic benefit, so as to solve the problems in the background technology.
In the continuous annealing process, the quality of the finished product strip steel is predicted in advance by accurately predicting the outlet temperature of the strip steel at the rapid cooling section of the continuous annealing unit, and meanwhile, the inlet temperature of the continuous annealing section and the temperature in the furnace can be adjusted and controlled in time according to the outlet temperature prediction of the strip steel, so that the ideal outlet temperature of the strip steel is achieved.
In order to achieve the purpose, the invention provides the following technical scheme:
a calculation method suitable for the strip steel temperature of a rapid cooling section of a continuous annealing unit comprises the following steps:
step 1), collecting parameters, which are respectively: specific heat capacity c of strip steel, mass m of strip steel and temperature T of strip steel entering rapid cooling arearAnd the comprehensive radiation coefficient C of the sample to the cooling wallLAverage temperature T of cooling gasbContact area S and furnace temperature TjGas ejection speed v, gas flow spacing l, distance s between the nozzle and the sample, and nozzle diameter d;
step 2), defining physical quantities which are respectively as follows: nozzle shape factor n, step Δ TsPrecision epsilon;
step 3) setting the strip steel outlet temperature Ts；
Step 4), Ts＝Ts+β·ΔTs；
Wherein: delta t-temperature of strip entering and leaving the fast cooling zoneA difference of Δ T ═ Tr-Ts，K；
Step 5), calculating the heat Q lost when the strip steel runs in the fast cooling section of the continuous annealing furnacez＝cm(Tr-Ts)；
Step 6) utilizing the equilibrium equation
Calculating Ts1；
Wherein: crDepending on the physical parameters of the blowing gas;
n is a nozzle shape coefficient, wherein the flat airflow n is equal to 1, and the circular airflow n is equal to 0.3-0.6;
λ -the thermal conductivity of the cooling medium, W/(m.K);
step 7), solving the obtained T by using the equilibrium equations1Calculating Qz1＝cm(Tr-Ts1)；
Step 8), judging Qz1-Qz≦ ε? If yes, jumping to the step 10), if not, continuing the next step;
step 9), β ═ β +1, jump to step 4);
step 10), outputting the strip steel temperature T of the fast cooling section of the continuous annealing units1。
In summary, compared with the prior art, the embodiment of the invention has the following beneficial effects:
the invention establishes a calculation method suitable for forecasting the strip steel temperature of the rapid cooling section of the continuous annealing unit, realizes the advanced forecasting of the quality of finished product strip steel by accurately forecasting the strip steel outlet temperature of the rapid cooling section of the continuous annealing unit, and can timely adjust and control the inlet temperature of the continuous annealing section and the temperature in a furnace according to the outlet strip steel outlet temperature forecast so as to achieve the ideal strip steel outlet temperature, ensure the high-speed production of the continuous annealing unit, improve the production efficiency and increase the economic benefit of enterprises.
To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a flow chart of a calculation method for forecasting the strip steel temperature of the rapid cooling section of the continuous annealing unit.
Detailed Description
The technical solution of the present invention is further described with reference to the accompanying drawings and specific embodiments.
To further explain the application process of the technology of the invention, a calculation method suitable for forecasting the strip steel temperature of the rapid cooling section of a continuous annealing unit is described in detail by taking a certain continuous annealing unit as an example:
referring to fig. 1, a method for calculating the strip steel temperature of the rapid cooling section of the continuous annealing unit comprises the following steps:
step (1), collecting parameters, which are respectively:
the specific heat capacity c of the strip steel is 450J/(kg. K), the mass m of the strip steel is 10000kg, and the temperature T of the strip steel entering a rapid cooling arear900K, integrated emissivity of the sample to the cooling wall CL0.65, average temperature T of cooling gasb70K, contact area S1000 m2Temperature T in furnacej400K, the gas ejection speed v is 80m/s, the gas flow interval l is 110mm, the distance s between the nozzle and the sample is 10mm, and the nozzle diameter d is 4 mm;
step (2), defining physical quantities, which are respectively: nozzle shape factor n is 0.5, step size Δ Ts20K, and 1000J;
step (3) setting the strip steel outlet temperature Ts＝570K；
Step (4), Ts＝Ts+β·ΔTs＝570K；
Step (5), calculating Qz＝cm(Tr-Ts)＝450×10000×(900-570)J＝1485000000J；
Step (6) utilizing a balance equation
Calculating Ts1＝600K；
Step (7), calculating Qz1＝cm(Tr-Ts1)＝1350000000J；
Step (8) of judging Qz1-Qz≦ ε? If the inequality is not true, continuing the next step;
step (9), β ═ β +1 ═ 1;
step (10), outputting Ts1＝630K；
According to the field application condition of the invention in the Bao steel cold rolling mill, the scheme is feasible, can be further popularized to other similar continuous annealing units in China, is used for forecasting the temperature of the strip steel at the fast cooling section of the continuous annealing unit, and has wide popularization and application prospects.
The technical principle of the present invention has been described above with reference to specific embodiments, which are merely preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. Other embodiments of the invention will occur to those skilled in the art without the exercise of inventive faculty, and such will fall within the scope of the invention.
Claims (5)
1. A calculation method suitable for the strip steel temperature of a rapid cooling section of a continuous annealing unit is characterized by comprising the following steps:
step 1), collecting parameters, which are respectively: specific heat capacity c of strip steel, mass m of strip steel and temperature T of strip steel entering rapid cooling arearAnd the comprehensive radiation coefficient C of the sample to the cooling wallLAverage temperature T of cooling gasbContact area S and furnace temperature TjGas ejection speed v, gas flow spacing l, distance s between the nozzle and the sample, and nozzle diameter d;
step 2), defining physical quantities which are respectively as follows: nozzle shape factor n, step Δ TsPrecision epsilon;
step 3) setting the strip steel outlet temperature Ts；
Step 4), Ts＝Ts+β·ΔTs；
Step 5), calculating the heat Q lost when the strip steel runs in the fast cooling section of the continuous annealing furnaceZ；
Step 6) utilizing the equilibrium equation
Calculating Ts1；
Step 7), solving the obtained T by using the equilibrium equations1；
Step 8), judging Qz1-Qz≦ ε? If yes, jumping to the step 10), if not, continuing the next step;
step 9), β ═ β +1, jump to step 4);
step 10), outputting the strip steel temperature T of the fast cooling section of the continuous annealing units1。
2. The method for calculating the temperature of the strip steel at the fast cooling section of the continuous annealing line according to claim 1, wherein in the step 4), Δ T is the temperature difference between the strip steel entering the fast cooling section and the strip steel leaving the fast cooling section, namely, Δ T ═ T-r-Ts，K。
3. The method for calculating the temperature of the strip steel at the fast cooling section of the continuous annealing unit as claimed in claim 2, wherein in the step 5), the heat Q lost isz＝cm(Tr-Ts)。
4. The method for calculating the temperature of the strip steel at the fast cooling section of the continuous annealing unit according to the claim 3, wherein in the balance equation of the step 6),
wherein: crDepending on the physical parameters of the blowing gas;
n is a nozzle shape coefficient, wherein the flat airflow n is equal to 1, and the circular airflow n is equal to 0.3-0.6;
λ is the thermal conductivity of the cooling medium, W/(m.K).
5. The method for calculating the strip steel temperature in the fast cooling section of the continuous annealing unit as claimed in claim 4, wherein in the step 7), Q is calculatedz1＝cm(Tr-Ts1)。
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| TW201330944A (en) * | 2012-01-20 | 2013-08-01 | China Steel Corp | Continuous annealing line cooling process parameter regulation method |
| CN103998631A (en) * | 2011-12-15 | 2014-08-20 | Posco公司 | Method and apparatus for controlling the strip temperature of the rapid cooling section of a continuous annealing line |
| CN104451118A (en) * | 2014-10-27 | 2015-03-25 | 燕山大学 | Forecasting method for segmental evolution of strip steel shape in continuous annealing process |
| WO2018024693A1 (en) * | 2016-08-02 | 2018-02-08 | Sms Group Gmbh | Method for operating an annealing furnace for annealing a metal strip |
| CN108034804A (en) * | 2017-12-08 | 2018-05-15 | 中国地质大学（武汉） | A kind of method and system of continuous annealing unit stove area energy consumption modeling |
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Patent Citations (9)
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| CN101131572A (en) * | 2006-08-25 | 2008-02-27 | 上海宝信软件股份有限公司 | Method and system for fast cooling temperature control |
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| CN103998631A (en) * | 2011-12-15 | 2014-08-20 | Posco公司 | Method and apparatus for controlling the strip temperature of the rapid cooling section of a continuous annealing line |
| TW201330944A (en) * | 2012-01-20 | 2013-08-01 | China Steel Corp | Continuous annealing line cooling process parameter regulation method |
| CN104451118A (en) * | 2014-10-27 | 2015-03-25 | 燕山大学 | Forecasting method for segmental evolution of strip steel shape in continuous annealing process |
| WO2018024693A1 (en) * | 2016-08-02 | 2018-02-08 | Sms Group Gmbh | Method for operating an annealing furnace for annealing a metal strip |
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