CN111424163A - Equipment and process for quickly realizing temperature transition of strip steel in continuous annealing furnace - Google Patents
Equipment and process for quickly realizing temperature transition of strip steel in continuous annealing furnace Download PDFInfo
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- CN111424163A CN111424163A CN201910022891.3A CN201910022891A CN111424163A CN 111424163 A CN111424163 A CN 111424163A CN 201910022891 A CN201910022891 A CN 201910022891A CN 111424163 A CN111424163 A CN 111424163A
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- heating
- strip steel
- temperature
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- magnetic induction
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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
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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
- 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
- C21D9/60—Continuous furnaces for strip or wire with induction heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses equipment and a process for quickly realizing temperature transition of strip steel in a continuous annealing furnace, wherein the equipment comprises the following steps: the heating section, the transverse magnetic induction heating section, the radiant tube soaking section, the slow cooling section and the fast cooling section are connected in sequence. The heating section is a direct fire heating section and a radiant tube heating section which are connected in sequence. The heating section is a direct-fire heating section. The heating section is used for longitudinal magnetic induction heating. The invention can quickly change the temperature of the strip steel by quickly adjusting the heating load of the heating equipment, and meet the requirement of quick response to the temperature of the strip steel when the specification of the strip steel changes or the annealing curve changes.
Description
Technical Field
The invention relates to the field of continuous heat treatment of steel strips, in particular to equipment and a process for quickly realizing temperature transition of steel strips in a continuous annealing furnace.
Background
In the continuous annealing furnace, the cold-rolled strip steel can reach the mechanical properties required by users after being treated by various heat treatment processes such as heating, cooling and the like. As shown in figure 1, the traditional continuous annealing furnace mainly comprises a heating section 1, a soaking section 2, a slow cooling section 3, a fast cooling section 4 and other process sections, and strip steel 5 passes through the process sections successively to complete the heat treatment process. The heat treatment process comprises detection of each process temperature, process temperature control and heat treatment time control. Wherein, the process temperature control mainly comprises heating temperature control and cooling temperature control. The heating temperature is generally controlled by heating methods such as direct firing heating, gas radiant tube heating, electric heating, induction heating, and the like, and the cooling temperature is generally controlled by jet cooling, water cooling roller cooling, water quenching cooling, and the like. In a conventional air injection cooling mode, the cooling temperature is adjusted by changing the rotation speed of a cooling fan to achieve the purpose of rapid temperature switching. However, compared with the control of the cooling temperature, the heating causes the thermal inertia of the hearth to be very strong, so that the reaction speed of the adjustment and control of the heating temperature which can be realized by the conventional heating mode is far lower than the adjustment speed of the cooling temperature, the actual strip steel heating temperature is easy to deviate from the control target when the annealing temperature or the strip steel specification is switched, and the strip steel performance is inconsistent as a result. Therefore, there is a need for a method of rapidly switching the heating temperature, which can greatly reduce the heating temperature mismatch caused by the annealing temperature or the strip specification transition.
In the existing continuous annealing furnace, the highest heating temperature of the strip steel is as high as 900 ℃, the heating mode of the radiant tube shown in figure 1 is mainly adopted, the average heating speed is generally within 3-15 ℃/s, and the higher the strip steel temperature is, the slower the heating speed is. In actual production, the specification of the strip steel and the annealing temperature change often exist, and when the temperature needs to be reduced, the temperature reduction speed is slow due to the large inertia of the heating furnace; when the temperature needs to be raised, the heating speed of the strip steel is low due to the fact that the relative heating speed of the radiant tube is low. The temperature rise and the temperature fall can cause the temperature transition section to be very long and the strip steel temperature to be inconsistent, thereby causing the strip steel performance to be inconsistent. In order to solve the problem, in the actual production, a steel coil for transition (non-finished product) is generally inserted into a finished product production plan, which occupies the capacity of a production line and consumes a large amount of unnecessary energy medium, so that the response speed of the temperature transition of the strip steel in the continuous annealing furnace needs to be increased, the use of the transition coil is reduced, the production efficiency is improved, and the product quality is improved.
At present, the heating technology used in the continuous annealing furnace at home and abroad comprises the following steps: direct fire heating, gas radiant tube heating, electric heating, induction heating and the like, wherein the heating speeds are in the sequence from fast to slow: induction heating > direct fire heating > gas radiant tube heating > electrical heating, the furnace thermal inertia is ordered from big to small: the analysis shows that the direct fire heating and the induction heating can not only obtain the fast heating speed, but also have the advantage of small thermal inertia, and can realize the fast switching of the strip steel temperature in the actual continuous annealing production. The induction heating performance is more excellent, but the conventional induction heaters generally used in the continuous annealing furnace are longitudinal magnetic induction heating (magnetic line of force parallel strip steel), the induction heaters can not effectively heat the thin strip steel at the temperature of more than 700 ℃, and only the newly developed and successful transverse magnetic induction heating (magnetic line of force vertical strip steel) equipment in the industry can effectively heat the thin strip steel at the temperature of more than 700 ℃. With regard to the transverse magnetic induction heating (magnetic line of force vertical strip) technology, currently, Cellas company and inducotern company in Belgium, which belong to the France FIVES group, can manufacture equipment and have practical application.
Based on the above analysis and description of the heating and cooling method, there is a possibility to develop a control mode that can realize the rapid switching of the strip temperature in the continuous annealing furnace, but no similar rapid transition control technology of the continuous annealing temperature is found in practical industrialized use performance, and the analysis main reasons should be as follows:
1) the prior induction heating equipment manufacturers do not develop transverse magnetic induction heating equipment, and cannot heat carbon steel thin strip steel above 700 ℃;
2) the advanced direct fire heating technology and the like are not fully popularized and used in industrialization.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide equipment and a process for quickly realizing the temperature transition of strip steel in a continuous annealing furnace, which can quickly change the temperature of the strip steel by quickly adjusting the heating load of heating equipment and meet the requirement of quick response to the temperature of the strip steel when the specification of the strip steel changes or an annealing curve changes.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the equipment for rapidly realizing the temperature transition of the strip steel in the continuous annealing furnace comprises: the strip steel is sequentially conveyed to pass through the heating section, the transverse magnetic induction heating section, the radiant tube soaking section, the slow cooling section and the fast cooling section.
The heating section is a direct fire heating section and a radiant tube heating section which are connected in sequence.
The heating section is a direct-fire heating section.
The heating section is used for longitudinal magnetic induction heating.
On the other hand, a process for rapidly realizing the temperature transition of strip steel in a continuous annealing furnace comprises the following steps:
when the temperature of the strip steel is less than 600 ℃, heating the strip steel by adopting a radiant tube heating section, when the temperature of the strip steel is more than 600 ℃, heating the strip steel to a target temperature by adopting transverse magnetic induction heating, and when the specification or the annealing curve of the strip steel is changed, adjusting the temperature of the strip steel by the heating power of the transverse magnetic induction heating;
when the temperature of the strip steel is less than 600 ℃, heating the strip steel by adopting a direct fire heating section, when the temperature of the strip steel is more than 600 ℃, continuously heating the strip steel to below 700 ℃ by adopting a radiant tube heating section, when the temperature of the strip steel reaches above 700 ℃, heating the strip steel to a target temperature by adopting transverse magnetic induction heating, and when the specification or annealing curve of the strip steel is changed, adjusting the temperature of the strip steel by using the combustion load of the direct fire heating section and the heating power of the transverse magnetic induction heating;
when the temperature of the strip steel is less than 700 ℃, heating the strip steel by adopting a direct fire heating section, when the temperature of the strip steel reaches above 700 ℃, heating the strip steel to a target temperature by adopting transverse magnetic induction heating, and when the specification or the annealing curve of the strip steel changes, adjusting the temperature of the strip steel by using the combustion load of the direct fire heating section and the heating power of the transverse magnetic induction heating;
the strip steel is heated to 700 ℃ by utilizing longitudinal magnetic induction heating, when the temperature of the strip steel reaches above 700 ℃, the strip steel is heated to a target temperature by adopting transverse magnetic induction heating, and when the specification or the annealing curve of the strip steel changes, the temperature of the strip steel is adjusted by the heating power of the longitudinal magnetic induction heating and the heating power of the transverse magnetic induction heating.
The heating speed of the heating section of the radiant tube is 20-30 ℃/s, the heating speed of transverse magnetic induction heating is 300 ℃/s, the heating speed of the direct-fire heating section is 50-100 ℃/s, and the heating speed of longitudinal magnetic induction heating is 300 ℃/s.
In the technical scheme, the equipment and the process for quickly realizing the temperature transition of the strip steel in the continuous annealing furnace provided by the invention also have the following beneficial effects:
1) the equipment and the process technology greatly improve the heating speed of the strip steel by introducing and using a direct fire heating technology and an electromagnetic induction heating technology in the continuous annealing furnace, and compared with the traditional continuous annealing furnace, the heating speed of the strip steel is improved from 3-15 ℃/s to the maximum of 100-300 ℃/s;
2) because the heating speed of the strip steel is greatly improved, and compared with the traditional radiant tube heating, the thermal inertia of the used direct fire heating and electromagnetic induction heating modes is greatly reduced, when the specification or annealing temperature of the strip steel is changed, the purpose of quickly adjusting the temperature of the strip steel can be achieved by quickly adjusting the combustion load of the direct fire heating and the heating power of the electromagnetic induction heating;
3) based on the beneficial effects of the two points, in the actual production using the continuous annealing furnace, the control precision of the strip steel temperature is improved, and the defective products with inconsistent temperature can be greatly reduced.
Drawings
FIG. 1 is a schematic view of a structure of a conventional continuous annealing furnace;
FIG. 2 is a schematic diagram of a first embodiment of the apparatus of the present invention;
FIG. 3 is a schematic diagram of a second embodiment of the apparatus of the present invention;
FIG. 4 is a schematic diagram of a third embodiment of the apparatus of the present invention;
fig. 5 is a schematic diagram of a fourth embodiment of the apparatus of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 2 to 5, the apparatus for rapidly implementing temperature transition of strip steel in a continuous annealing furnace provided by the present invention includes: the heating section, the transverse magnetic induction heating section 6, the radiant tube soaking section 7, the slow cooling section 8 and the fast cooling section 9 are connected in sequence, and the strip steel 10 is conveyed through the heating section, the transverse magnetic induction heating section 6, the radiant tube soaking section 7, the slow cooling section 8 and the fast cooling section 9 in sequence.
Preferably, the heating section is a direct-fire heating section 11 and a radiant tube heating section 12 which are connected in sequence.
Preferably, the heating section is a direct-fire heating section 11.
Preferably, the heating section is longitudinal magnetic induction heating 13.
The invention also provides a process for quickly realizing the temperature transition of the strip steel in the continuous annealing furnace, which comprises the following steps:
as shown in fig. 2, when the temperature of the strip steel 10 is less than 600 ℃, the heating section 12 of the radiant tube is adopted for heating, and the heating speed can reach 20-30 ℃/s because the temperature of the strip steel 10 is relatively low; when the temperature of the strip steel is more than 10 ℃ and more than 600 ℃, the strip steel is heated to the target temperature by adopting the transverse magnetic induction heating 6, and the heating speed can reach 100-; when the specification or the annealing curve of the strip steel 8 changes, the purpose of quickly adjusting the temperature of the strip steel 10 can be achieved by quickly adjusting the heating power of the transverse magnetic induction heating 6.
As shown in fig. 3, when the temperature of the strip steel 10 is less than 600 ℃, the direct fire heating section 11 is used for heating, and the heating speed of the direct fire heating section 10 can reach 50-100 ℃/s; when the temperature of the strip steel 10 is higher than 600 ℃, the strip steel 10 is continuously heated to below 700 ℃ by adopting the radiant tube heating section 12, and the heating speed can reach 20-30 ℃/s; when the temperature of the strip steel 10 reaches above 700 ℃, the strip steel 10 is heated to the target temperature by adopting the transverse magnetic induction heating 6, and the heating speed can reach 100-; when the specification or the annealing curve of the strip steel 10 changes, the purpose of quickly adjusting the temperature of the strip steel 10 can be achieved by quickly adjusting the combustion load of the direct-fire heating section 11 and the heating power of the transverse magnetic induction heating 6.
As shown in fig. 4, when the temperature of the strip steel 10 is less than 700 ℃, the direct fire heating section 11 is used for heating, and the heating speed of the direct fire heating section 10 can reach 50-100 ℃/s; when the temperature of the strip steel 10 reaches above 700 ℃, the strip steel 10 is heated to the target temperature by adopting the transverse magnetic induction heating 6, and the heating speed can reach 100-; when the specification or the annealing curve of the strip steel 10 changes, the purpose of quickly adjusting the temperature of the strip steel 10 can be achieved by quickly adjusting the combustion load of the direct-fire heating section 11 and the heating power of the transverse magnetic induction heating 6.
As shown in FIG. 5, the strip steel 10 is heated to 700 ℃ by the longitudinal magnetic induction heating 13, and the heating speed can reach 100-; when the temperature of the strip steel 10 reaches above 700 ℃, the strip steel 10 is heated to the target temperature by adopting the transverse magnetic induction heating 6, and the heating speed can reach 100-; when the specification or annealing curve of the strip steel 10 changes, the purpose of quickly adjusting the temperature of the strip steel 10 can be achieved by quickly adjusting the heating power of the longitudinal magnetic induction heating 13 and the heating power of the transverse magnetic induction heating 6.
In conclusion, the equipment and the process for rapidly realizing the temperature transition of the strip steel in the continuous annealing furnace have the advantages that the heating efficiency of the strip steel is high, the heating speed is high, the temperature switching of the strip steel can be rapidly completed in production, the temperature control precision of the strip steel is improved, and the occurrence of the inconsistency of the strip steel performance caused by the inconsistency of the heat treatment temperature is greatly reduced.
The equipment and the process of the invention have very positive and effective effects on more effectively controlling the heat treatment annealing temperature of the strip steel, and have very good popularization and application prospects in the fields of production process of continuous annealing process and product quality control.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (6)
1. The utility model provides an equipment of quick realization belted steel temperature transition in continuous annealing stove which characterized in that includes: the strip steel is sequentially conveyed to pass through the heating section, the transverse magnetic induction heating section, the radiant tube soaking section, the slow cooling section and the fast cooling section.
2. The apparatus for rapidly realizing the transition of the strip steel temperature in the continuous annealing furnace according to claim 1, characterized in that: the heating section is a direct fire heating section and a radiant tube heating section which are connected in sequence.
3. The apparatus for rapidly realizing the transition of the strip steel temperature in the continuous annealing furnace according to claim 1, characterized in that: the heating section is a direct-fire heating section.
4. The apparatus for rapidly realizing the transition of the strip steel temperature in the continuous annealing furnace according to claim 1, characterized in that: the heating section is used for longitudinal magnetic induction heating.
5. A process for rapidly achieving a strip temperature transition in a continuous annealing furnace according to any of claims 1 to 4, characterized in that:
when the temperature of the strip steel is less than 600 ℃, heating the strip steel by adopting a radiant tube heating section, when the temperature of the strip steel is more than 600 ℃, heating the strip steel to a target temperature by adopting transverse magnetic induction heating, and when the specification or the annealing curve of the strip steel is changed, adjusting the temperature of the strip steel by the heating power of the transverse magnetic induction heating;
when the temperature of the strip steel is less than 600 ℃, heating the strip steel by adopting a direct fire heating section, when the temperature of the strip steel is more than 600 ℃, continuously heating the strip steel to below 700 ℃ by adopting a radiant tube heating section, when the temperature of the strip steel reaches above 700 ℃, heating the strip steel to a target temperature by adopting transverse magnetic induction heating, and when the specification or annealing curve of the strip steel is changed, adjusting the temperature of the strip steel by using the combustion load of the direct fire heating section and the heating power of the transverse magnetic induction heating;
when the temperature of the strip steel is less than 700 ℃, heating the strip steel by adopting a direct fire heating section, when the temperature of the strip steel reaches above 700 ℃, heating the strip steel to a target temperature by adopting transverse magnetic induction heating, and when the specification or the annealing curve of the strip steel changes, adjusting the temperature of the strip steel by using the combustion load of the direct fire heating section and the heating power of the transverse magnetic induction heating;
the strip steel is heated to 700 ℃ by utilizing longitudinal magnetic induction heating, when the temperature of the strip steel reaches above 700 ℃, the strip steel is heated to a target temperature by adopting transverse magnetic induction heating, and when the specification or the annealing curve of the strip steel changes, the temperature of the strip steel is adjusted by the heating power of the longitudinal magnetic induction heating and the heating power of the transverse magnetic induction heating.
6. The process for rapidly realizing the temperature transition of the strip steel in the continuous annealing furnace according to claim 5, characterized in that: the heating speed of the heating section of the radiant tube is 20-30 ℃/s, the heating speed of transverse magnetic induction heating is 300 ℃/s, the heating speed of the direct-fire heating section is 50-100 ℃/s, and the heating speed of longitudinal magnetic induction heating is 300 ℃/s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910022891.3A CN111424163A (en) | 2019-01-10 | 2019-01-10 | Equipment and process for quickly realizing temperature transition of strip steel in continuous annealing furnace |
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| CN201910022891.3A CN111424163A (en) | 2019-01-10 | 2019-01-10 | Equipment and process for quickly realizing temperature transition of strip steel in continuous annealing furnace |
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| CN111424163A true CN111424163A (en) | 2020-07-17 |
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| CN201910022891.3A Pending CN111424163A (en) | 2019-01-10 | 2019-01-10 | Equipment and process for quickly realizing temperature transition of strip steel in continuous annealing furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111979408A (en) * | 2020-07-22 | 2020-11-24 | 重庆赛迪热工环保工程技术有限公司 | Sectional type strip steel process transition control method for horizontal annealing furnace |
| WO2024056085A1 (en) * | 2022-09-15 | 2024-03-21 | 宝山钢铁股份有限公司 | Rapid heat treatment production line of strip steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111979408A (en) * | 2020-07-22 | 2020-11-24 | 重庆赛迪热工环保工程技术有限公司 | Sectional type strip steel process transition control method for horizontal annealing furnace |
| CN111979408B (en) * | 2020-07-22 | 2021-12-07 | 重庆赛迪热工环保工程技术有限公司 | Sectional type strip steel process transition control method for horizontal annealing furnace |
| WO2024056085A1 (en) * | 2022-09-15 | 2024-03-21 | 宝山钢铁股份有限公司 | Rapid heat treatment production line of strip steel |
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