CN111575451A - Cold-rolled strip steel continuous annealing process with energy-saving effect - Google Patents
Cold-rolled strip steel continuous annealing process with energy-saving effect Download PDFInfo
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- CN111575451A CN111575451A CN202010352078.5A CN202010352078A CN111575451A CN 111575451 A CN111575451 A CN 111575451A CN 202010352078 A CN202010352078 A CN 202010352078A CN 111575451 A CN111575451 A CN 111575451A
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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
- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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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
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- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a cold-rolled strip steel continuous annealing process with an energy-saving effect, which comprises the following steps: s1, preheating strip steel: the recovered unburned fuel gas and protective gas are subjected to afterburning through a preheating furnace, so that the temperature of the strip steel reaches 400-500 ℃; s2, non-oxidation rapid heating: the strip steel is subjected to open-fire non-oxidation heating of fuel gas by a non-oxidation heating furnace, unburned fuel gas is recovered, and heat energy of high-temperature flue gas is recovered by a heat exchanger; s3, heating the radiant tube at high temperature: heating the strip steel through a radiant tube heating furnace, and recovering heat energy of high-temperature flue gas through a heat exchanger; s4, soaking and preserving heat: and (4) preserving the heat of the cold-rolled strip steel by a soaking furnace, and recovering protective gas. The invention can greatly improve the energy utilization rate by effectively recovering and fully utilizing the unburned fuel gas, the protective gas and the high-temperature waste heat of the flue gas in the system, thereby achieving the effect of energy conservation.
Description
Technical Field
The invention relates to a cold-rolled strip steel continuous annealing process, in particular to a cold-rolled strip steel continuous annealing process with an energy-saving effect.
Background
The cold-rolled steel strip usually needs to be annealed in the production process to eliminate cold-rolling work hardening and restore plasticity. At present, the main annealing modes of the cold-rolled strip steel comprise cover annealing and continuous annealing, wherein the continuous annealing has the advantages of short process time, high surface quality and the like.
The continuous annealing is divided into vertical continuous annealing and horizontal continuous annealing. Protective gas is generally introduced into the furnace. The continuous annealing is a new annealing technology for cold-rolled plate strip steel, which is introduced in the 70 s of the 20 th century, and the annealing yield is large. The continuous furnace annealing is developed for years, annealing equipment is continuously improved, and the continuous furnace annealing is gradually specialized according to the variety of production, so that the unit capital construction cost is reduced, and the product quality is favorably improved. The continuous furnace annealing can not only produce the strip steel with good surface grade and special deep drawing grade, but also produce high-strength plate strip steel. Therefore, the method has higher popularization and improvement values.
However, the current cold-rolled strip steel continuous annealing process does not adopt an energy-saving technology combining preheating, high-temperature heating and full energy recycling, so that the energy consumption is generally high, the process is very unfavorable for saving increasingly scarce precious energy resources, and meanwhile, the external emission cannot be better controlled, and the process is not favorable for environmental protection.
Disclosure of Invention
The invention aims to provide a cold-rolled strip steel continuous annealing process with an energy-saving effect, which can efficiently recycle the discharge resources of a system so as to realize the energy-saving effect.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a cold-rolled strip steel continuous annealing process with an energy-saving effect comprises the following steps: s1, preheating strip steel: combustion-supporting air is input into the preheating furnace, and the recovered unburned fuel gas and protective gas are subjected to afterburning through the preheating furnace, so that the temperature of the strip steel reaches 400-; s2, non-oxidation rapid heating: combustion-supporting air is input into the non-oxidation heating furnace, the strip steel is subjected to gas open fire non-oxidation heating through the non-oxidation heating furnace, the strip steel reaches 700-; s3, heating the radiant tube at high temperature: combustion-supporting air is input into the radiant tube heating furnace, the strip steel is heated by the radiant tube heating furnace to reach 800-; s4, soaking and preserving heat: the cold-rolled strip steel is subjected to heat preservation through a soaking furnace, the heat preservation temperature is 800-; s5, cooling by circulating gas injection: and (3) spraying circulating air to the surface of the strip steel by using a gas nozzle to uniformly cool the strip steel to below 100 ℃.
The cold-rolled strip steel continuous annealing process with the energy-saving effect utilizes unburned fuel gas and protective gas recovered by the system to carry out afterburning, can effectively preheat strip steel, thereby saving the energy consumption of the next working procedure, simultaneously exchanges and recovers heat energy in high-temperature flue gas of the system, and is used for preheating combustion-supporting air input in a preheating furnace, combustion-supporting air input in a non-oxidation heating furnace and combustion-supporting air input in a radiant tube heating furnace, so that the energy utilization rate of the system can be further improved, and the effects of energy conservation and environmental protection are achieved.
Preferably, the unburned gas recovered in step S1 is obtained from an non-oxidation heating furnace, and the content of the unburned gas is generally high in the process of rapidly heating the cold-rolled steel strip in the non-oxidation heating furnace.
Preferably, the protective gas recovered in step S1 is from a soaking furnace, and the soaking furnace usually needs to use a protective gas during the long-term heat preservation of the cold-rolled steel strip, and most of these gases are combustible gases.
Preferably, the combustion air input in the step S1 is preheated to 400 ℃ and 500 ℃, which is beneficial to rapidly preheating the cold-rolled strip steel.
Preferably, the combustion air input in the step S2 is preheated to 400 ℃ and 500 ℃, which is beneficial to rapidly heating the cold-rolled strip steel.
Preferably, the combustion air input in the step S3 is preheated to 300-.
Preferably, the heat energy recovered by the heat exchanger in the step S2 is used for preheating the combustion air used in S1 and S2, and the heat energy recovered by the heat exchanger can be reused nearby, so that the heat loss is small.
Preferably, the heat energy recovered by the heat exchanger in the step S3 is used to preheat the combustion air used in S3, and the heat energy recovered by the heat exchanger can be reused nearby, so that the heat loss is small.
Preferably, the heating mode of the soaking pit furnace in the S4 is resistance band heating, so that the heating temperature can be adjusted in real time and accurately controlled.
Preferably, the protective gas in the S4 is hydrogen or/and nitrogen, so that the better surface quality of the cold-rolled strip steel can be ensured, and the cost is lower.
Compared with the prior art, the cold-rolled strip steel continuous annealing process has the beneficial effects that: through effectively retrieving and make full use of unburned gas, protective gas and flue gas high temperature waste heat in the system, can improve entire system's energy utilization ratio greatly and reduce to empty the emission to reach energy-concerving and environment-protective effect.
Drawings
FIG. 1 is a flow chart of a cold-rolled strip steel continuous annealing process with energy-saving effect.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the cold-rolled strip steel continuous annealing process with energy-saving effect provided by the invention comprises the following steps: s1, preheating strip steel: combustion-supporting air is input into the preheating furnace, and the recovered unburned fuel gas and protective gas are subjected to afterburning through the preheating furnace, so that the temperature of the strip steel reaches 400-; s2, non-oxidation rapid heating: combustion-supporting air is input into the non-oxidation heating furnace, the strip steel is subjected to gas open fire non-oxidation heating through the non-oxidation heating furnace, the strip steel reaches 700-; s3, heating the radiant tube at high temperature: combustion-supporting air is input into the radiant tube heating furnace, the strip steel is heated by the radiant tube heating furnace to reach 800-; s4, soaking and preserving heat: the cold-rolled strip steel is subjected to heat preservation through a soaking furnace, the heat preservation temperature is 800-; s5, cooling by circulating gas injection: and (3) spraying circulating air to the surface of the strip steel by using a gas nozzle to uniformly cool the strip steel to below 100 ℃.
As shown in fig. 1, in the cold-rolled strip steel continuous annealing process with energy-saving effect of the present invention, the unburned fuel gas recovered in step S1 comes from a non-oxidation heating furnace; the protective gas recovered in the step S1 comes from a soaking pit; preheating the combustion-supporting air input in the step S1 to 400-500 ℃; preheating the combustion-supporting air input in the step S2 to 400-500 ℃; preheating the combustion-supporting air input in the step S3 to 300-400 ℃; the heat energy recovered by the heat exchanger in the step S2 is used to preheat the combustion air used in S1 and S2; the heat energy recovered by the heat exchanger in the step S3 is used to preheat the combustion air used in the step S3; the heating mode of the soaking pit furnace in the S4 is resistance zone heating; the protective gas in the S4 is hydrogen or/and nitrogen.
As shown in figure 1, the cold-rolled strip steel continuous annealing process with the energy-saving effect, disclosed by the invention, has the advantages that when the strip steel is preheated, an afterburner is adopted for heating, and only recycled unburnt fuel gas and protective gas are required to be introduced into the process during heating, and no special combustible gas is required to be introduced into the process.
Example 1
As shown in fig. 1, the cold-rolled strip steel continuous annealing process with energy-saving effect provided by the invention comprises the following steps: s1, preheating strip steel: inputting combustion-supporting air into the preheating furnace, and performing afterburning on the recovered unburned gas and the protective gas through the preheating furnace to enable the strip steel to reach the temperature of 400-450 ℃, wherein the recovered unburned gas comes from the non-oxidation heating furnace, the recovered protective gas comes from the soaking furnace, and the input combustion-supporting air is preheated to the temperature of 400-450 ℃; s2, non-oxidation rapid heating: combustion-supporting air is input into the non-oxidation heating furnace, the input combustion-supporting air is preheated to 400-; s3, heating the radiant tube at high temperature: combustion-supporting air is input into the radiant tube heating furnace, the input combustion-supporting air is preheated to 350 ℃, the radiant tube heating furnace is used for heating the strip steel to 800-; s4, soaking and preserving heat: the cold-rolled strip steel is subjected to heat preservation through a soaking furnace, the heat preservation temperature is 800-; s5, cooling by circulating gas injection: and (3) spraying circulating air to the surface of the strip steel by using a gas nozzle to uniformly cool the strip steel to below 100 ℃.
Example 2
As shown in fig. 1, the cold-rolled strip steel continuous annealing process with energy-saving effect provided by the invention comprises the following steps: s1, preheating strip steel: inputting combustion-supporting air into the preheating furnace, and performing afterburning on the recovered unburned gas and the protective gas through the preheating furnace to enable the strip steel to reach 500 ℃ at 450-; s2, non-oxidation rapid heating: combustion-supporting air is input into the non-oxidation heating furnace, the input combustion-supporting air is preheated to 500 ℃ plus 450 ℃, the strip steel is subjected to gas open flame non-oxidation heating through the non-oxidation heating furnace, the strip steel reaches 750 ℃ plus 720 ℃, unburned gas is recovered, heat energy of high-temperature flue gas is recovered through a heat exchanger, and the heat energy recovered through the heat exchanger is used for preheating the combustion-supporting air used in S1 and S2; s3, heating the radiant tube at high temperature: combustion-supporting air is input into the radiant tube heating furnace, the input combustion-supporting air is preheated to 350-; s4, soaking and preserving heat: the cold-rolled strip steel is subjected to heat preservation through a soaking furnace, the heat preservation temperature is 820-; s5, cooling by circulating gas injection: and (3) spraying circulating air to the surface of the strip steel by using a gas nozzle to uniformly cool the strip steel to below 100 ℃.
Example 3
As shown in fig. 1, the cold-rolled strip steel continuous annealing process with energy-saving effect provided by the invention comprises the following steps: s1, preheating strip steel: inputting combustion-supporting air into the preheating furnace, and performing afterburning on the recovered unburned gas and the protective gas through the preheating furnace to enable the strip steel to reach 480 ℃ of 430-; s2, non-oxidation rapid heating: combustion-supporting air is input into the non-oxidation heating furnace, the input combustion-supporting air is preheated to the temperature of 430-; s3, heating the radiant tube at high temperature: inputting combustion-supporting air into the radiant tube heating furnace, preheating the input combustion-supporting air to 330-; s4, soaking and preserving heat: the cold-rolled strip steel is subjected to heat preservation through a soaking furnace, the heat preservation temperature is 810-; s5, cooling by circulating gas injection: and (3) spraying circulating air to the surface of the strip steel by using a gas nozzle to uniformly cool the strip steel to below 100 ℃.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (10)
1. A cold-rolled strip steel continuous annealing process with an energy-saving effect is characterized by comprising the following steps:
s1, preheating strip steel: combustion-supporting air is input into the preheating furnace, and the recovered unburned fuel gas and protective gas are subjected to afterburning through the preheating furnace, so that the temperature of the strip steel reaches 400-;
s2, non-oxidation rapid heating: combustion-supporting air is input into the non-oxidation heating furnace, the strip steel is subjected to gas open fire non-oxidation heating through the non-oxidation heating furnace, the strip steel reaches 700-;
s3, heating the radiant tube at high temperature: combustion-supporting air is input into the radiant tube heating furnace, the strip steel is heated by the radiant tube heating furnace to reach 800-;
s4, soaking and preserving heat: the cold-rolled strip steel is subjected to heat preservation through a soaking furnace, the heat preservation temperature is 800-;
s5, cooling by circulating gas injection: and (3) spraying circulating air to the surface of the strip steel by using a gas nozzle to uniformly cool the strip steel to below 100 ℃.
2. The cold-rolled steel strip continuous annealing process with energy-saving effect as claimed in claim 1, characterized in that: the unburned fuel gas recovered in step S1 is from a non-oxidizing heating furnace.
3. The cold-rolled steel strip continuous annealing process with energy-saving effect as claimed in claim 1, characterized in that: the protective gas recovered in step S1 comes from a soaking furnace.
4. The cold-rolled steel strip continuous annealing process with energy-saving effect as claimed in claim 1, characterized in that: the combustion air input in the step S1 is preheated to 400-.
5. The cold-rolled steel strip continuous annealing process with energy-saving effect as claimed in claim 1, characterized in that: the combustion air input in the step S2 is preheated to 400-.
6. The cold-rolled steel strip continuous annealing process with energy-saving effect as claimed in claim 1, characterized in that: the combustion air input in the step S3 is preheated to 300-.
7. The cold-rolled steel strip continuous annealing process with energy-saving effect as claimed in claim 1, characterized in that: the thermal energy recovered by the heat exchanger in the step S2 is used to preheat the combustion air used in S1 and S2.
8. The cold-rolled steel strip continuous annealing process with energy-saving effect as claimed in claim 1, characterized in that: the heat energy recovered by the heat exchanger in the step S3 is used to preheat the combustion air used in S3.
9. The cold-rolled steel strip continuous annealing process with energy-saving effect as claimed in claim 1, characterized in that: the heating mode of the soaking furnace in the S4 is resistance band heating.
10. The cold-rolled steel strip continuous annealing process with energy-saving effect as claimed in claim 1, characterized in that: the protective gas in the S4 is hydrogen or/and nitrogen.
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| CN202010352078.5A CN111575451A (en) | 2020-04-28 | 2020-04-28 | Cold-rolled strip steel continuous annealing process with energy-saving effect |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113046674A (en) * | 2021-03-31 | 2021-06-29 | 常熟科弘材料科技有限公司 | Preparation process of thin hot-dip galvanized steel plate and thin hot-dip galvanized steel plate |
| CN113234915A (en) * | 2021-05-17 | 2021-08-10 | 山东一清光亮炉设备有限公司 | Intelligent heat energy circulation matching process for continuous annealing process |
| CN113587638A (en) * | 2021-06-28 | 2021-11-02 | 河钢股份有限公司 | Heating furnace and method for preparing hot-forming agricultural implement wear-resistant part |
| CN113894159A (en) * | 2021-09-30 | 2022-01-07 | 中冶赛迪上海工程技术有限公司 | Hot-rolled strip steel heat treatment processing method |
| CN114561520A (en) * | 2022-03-04 | 2022-05-31 | 新疆八一钢铁股份有限公司 | Hydrogen-rich cyclic annealing process for cold-rolled oil drum plate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113046674A (en) * | 2021-03-31 | 2021-06-29 | 常熟科弘材料科技有限公司 | Preparation process of thin hot-dip galvanized steel plate and thin hot-dip galvanized steel plate |
| CN113234915A (en) * | 2021-05-17 | 2021-08-10 | 山东一清光亮炉设备有限公司 | Intelligent heat energy circulation matching process for continuous annealing process |
| CN113587638A (en) * | 2021-06-28 | 2021-11-02 | 河钢股份有限公司 | Heating furnace and method for preparing hot-forming agricultural implement wear-resistant part |
| CN113894159A (en) * | 2021-09-30 | 2022-01-07 | 中冶赛迪上海工程技术有限公司 | Hot-rolled strip steel heat treatment processing method |
| CN114561520A (en) * | 2022-03-04 | 2022-05-31 | 新疆八一钢铁股份有限公司 | Hydrogen-rich cyclic annealing process for cold-rolled oil drum plate |
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Application publication date: 20200825 |