CN110643805A - Furnace chamber atmosphere fluctuation pressurization replacement method for continuous annealing furnace - Google Patents
Furnace chamber atmosphere fluctuation pressurization replacement method for continuous annealing furnace Download PDFInfo
- Publication number
- CN110643805A CN110643805A CN201910815992.6A CN201910815992A CN110643805A CN 110643805 A CN110643805 A CN 110643805A CN 201910815992 A CN201910815992 A CN 201910815992A CN 110643805 A CN110643805 A CN 110643805A
- Authority
- CN
- China
- Prior art keywords
- atmosphere
- furnace
- hearth
- nitrogen
- continuous annealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
Abstract
The invention relates to a furnace hearth atmosphere fluctuation pressurization replacement method of a continuous annealing furnace, belonging to the technical field of cold-rolled sheet continuous annealing production in the metallurgical industry, which adopts the technical scheme that the furnace hearth atmosphere pressure and the heat-preservation cotton atmosphere pressure are both replaced in the state of 200 ~ 300Pa, when the oxygen content m1 of the furnace hearth atmosphere is reduced to 7000 ~ 8000ppm, the furnace hearth atmosphere pressure is increased to 600 ~ 800Pa, until the pressure difference between the furnace hearth atmosphere and the heat-preservation cotton atmosphere is less than 10Pa, the nitrogen injection amount is gradually reduced until the oxygen content of the furnace hearth atmosphere is less than 200ppm, the continuous furnace hearth atmosphere fluctuation pressurization replacement is completed.
Description
Technical Field
The invention relates to a furnace atmosphere fluctuation pressurization replacement method for a continuous annealing furnace, belonging to the technical field of continuous annealing production of cold-rolled sheets in the metallurgical industry.
Background
The continuous annealing line is a production unit mainly used for producing cold-rolled sheets, wherein the continuous annealing line is key equipment for carrying out annealing process treatment on the cold-rolled sheets. The continuous annealing furnace adopts a full radiant tube for heating, the atmosphere in the furnace is protective gas mainly containing nitrogen, and the protective gas is used for isolating air, so that the furnace is always kept in an oxygen-free reducing atmosphere, and the condition that the plate strip is oxidized in the continuous annealing furnace is ensured.
The inner wall of the annealing furnace adopts heat insulation cotton and a stainless steel lining board as refractory materials to isolate heat. In the production process of the cold-rolled sheet, blow-in operation is required due to production accidents such as strip steel breakage in a furnace, furnace roller nodulation and the like or maintenance of equipment in the furnace. In the blow-in operation, the annealing furnace needs to be cooled, and then the supply of nitrogen and hydrogen is stopped. After air enters the hearth to replace residual nitrogen, the maintainers can enter the annealing furnace to treat accidents. When the furnace is opened and normal production is resumed again, atmosphere replacement operation needs to be carried out on the hearth of the continuous annealing furnace firstly, namely, air with oxidability in the hearth is replaced by inert gas nitrogen, so that equipment or product damage caused by oxidation reaction of equipment or strip steel in the temperature rising stage is avoided. The atmosphere replacement work of the annealing furnace is an important part in the recovery process.
At present, the method for replacing the atmosphere of the hearth of the annealing furnace is to inject a large amount of nitrogen into the hearth, open a diffusion valve at the same time, and perform atmosphere replacement work through long-time gas flowing and diffusion. Because the inside of the continuous annealing furnace is a closed space, nitrogen in the furnace is replaced by injecting the nitrogen into the furnace through a furnace bottom injection pipeline and then discharging the nitrogen from an automatic bleeding valve at the top of the furnace. And the oxygen in the hearth is reduced to the required oxygen content value through continuous blowing and dilution of nitrogen in the furnace. Because the annealing furnace is internally provided with a large amount of heat preservation cotton, after the continuous annealing furnace is opened for a long time, a large amount of air enters the heat preservation cotton through diffusion, and only oxygen in a hearth outside the heat preservation cotton can be blown away in the nitrogen replacement process of the hearth. And the oxygen in the heat preservation cotton needs to be diluted and replaced after gas molecules gradually diffuse to the hearth by the self diffusion motion. In the whole nitrogen purging process of the hearth, air adsorbed in the heat-insulating cotton cannot be rapidly purged and eliminated due to the refractory lining plate and the heat-insulating cotton and can only be reduced through gas diffusion, so that the purging time of the hearth is too long, the energy consumption medium is too much, the production time needs to be recovered, and the production rhythm and the production yield are seriously influenced.
Disclosure of Invention
The invention aims to provide a furnace atmosphere fluctuation pressurization replacement method for a continuous annealing furnace, which can quickly eliminate air adsorbed into heat-preservation cotton, thereby reducing the furnace purging time and the furnace purging nitrogen consumption and solving the problems in the background technology.
The technical scheme of the invention is as follows:
a continuous annealing furnace hearth atmosphere fluctuation pressurization replacement method is characterized in that heat preservation cotton and a stainless steel lining plate are arranged on the inner wall of a continuous annealing furnace and used for heat preservation and heat insulation of a hearth; the continuous annealing furnace is provided with a nitrogen displacement pipeline, and a nitrogen flow regulating valve is arranged on the nitrogen displacement pipeline and used for regulating the flow of the blowing nitrogen; the furnace top diffusion regulating valve is arranged on a furnace top diffusion pipeline and used for regulating the nitrogen replacement purging opening, and the furnace hearth atmosphere fluctuation pressurization replacement method of the continuous annealing furnace comprises the following steps:
firstly, after the annealing furnace is sealed, regulating the nitrogen injection amount and the opening degree of a furnace top diffusion regulating valve through a nitrogen flow regulating valve, so that the internal atmosphere pressure of the hearth and the internal atmosphere pressure of the heat preservation cotton are subjected to internal atmosphere replacement in the hearth under the condition of 200 ~ 300 Pa;
when the oxygen content of the atmosphere in the hearth is reduced to 7000 ~ 8000ppm, gradually increasing the nitrogen injection amount, and gradually reducing the opening of a furnace top diffusion regulating valve until the atmosphere pressure in the hearth is increased to 600 ~ 800Pa, and the atmosphere pressure in the heat-preservation cotton is increased to 450 ~ 550 Pa;
keeping the nitrogen injection amount and the opening degree of a furnace top diffusion regulating valve in the step, continuously performing atmosphere replacement inside the hearth until the pressure difference between the atmosphere inside the hearth and the atmosphere inside the heat preservation cotton is less than 10Pa, and continuously performing atmosphere replacement inside the hearth for 10 ~ 15min in the state;
gradually reducing the nitrogen injection amount, and simultaneously gradually increasing the opening of the furnace top diffusion regulating valve until the internal atmosphere pressure of the hearth is reduced to 320 ~ Pa and the internal atmosphere pressure of the heat-preservation cotton is 450 ~ Pa;
keeping the nitrogen injection amount and the opening degree of the furnace top diffusion regulating valve in the step IV, continuously replacing the atmosphere in the hearth until the pressure difference between the atmosphere in the hearth and the atmosphere in the heat preservation cotton is less than 10Pa, and continuously replacing the atmosphere in the hearth for 3 ~ 5min in the state;
sixthly, repeating the step III to the step V, and starting to ignite and heat the continuous annealing furnace when the oxygen content of the atmosphere in the hearth is reduced to 300 ~ 500 ppm;
and seventhly, in the ignition temperature rise process of the continuous annealing furnace, repeating the step III-the step V at the same time, and finishing the fluctuation pressurization replacement of the furnace chamber atmosphere of the continuous annealing furnace when the oxygen content of the furnace chamber atmosphere is less than 200 ppm.
The nitrogen injection amount in the step (i) is 4000 ~ 5000Nm and 5000Nm3H, the opening degree of the furnace top diffusion regulating valve is 50 percent;
the injection amount of the nitrogen in the step (II) is 4000 ~ 5000Nm and 5000Nm3Step-wise increase in/H to 5500 ~ 6500Nm3H, gradually reducing the opening degree of the furnace top diffusion regulating valve from 50% to 10%;
the injection amount of nitrogen in the step (c) is 5500 ~ 6500Nm3H, the opening degree of the furnace top diffusion regulating valve is 10 percent;
in the step (iv)The nitrogen injection amount is from 5500 ~ 6500Nm3Stepwise reduction of/H to 2800 ~ 3500 Nm3H, gradually increasing the opening of the furnace top diffusion regulating valve from 10% to 50%;
the injection amount of nitrogen in the step (v) is 2800 ~ 3500 Nm3And H, the opening degree of the furnace top diffusion regulating valve is 50 percent.
The method mainly comprises the steps of adjusting the injection amount of nitrogen of the annealing furnace and the opening degree of a furnace top bleeding valve to enable the pressure difference between the internal atmosphere pressure of the hearth and the internal atmosphere pressure of the heat-preservation cotton to exist, increasing the diffusion efficiency of oxygen and nitrogen in the annealing hearth through high pressure difference, enabling the oxygen in the heat-preservation cotton to be rapidly diffused into the hearth, and rapidly discharging the atmosphere containing oxygen out of the hearth through the furnace top bleeding valve through high pressure difference airflow, thereby shortening the atmosphere replacement time of the hearth of the annealing furnace.
The invention has the beneficial effects that: through the fluctuation pressure difference of furnace atmosphere pressure and the cotton atmosphere internal pressure that keeps warm, the cotton internal oxygen that keeps warm is replaced with higher speed to can effectually shorten furnace nitrogen gas replacement time, reduce the nitrogen gas consumption, shorten and resume production time consuming, very big satisfying production rhythm and energy-conserving demand.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1. the device comprises a continuous annealing furnace, 2 parts of heat preservation cotton, 3 parts of a stainless steel lining plate, 4 parts of a nitrogen replacement pipeline, 5 parts of a furnace top diffusion pipeline, 6 parts of a nitrogen flow regulating valve, 7 parts of a furnace top diffusion regulating valve, 8 parts of a hearth pressure transmitter, 9 parts of a heat preservation cotton internal pressure transmitter, 10 parts of an atmosphere analyzer.
Detailed Description
The invention is further illustrated by way of example in the following with reference to the accompanying drawings.
Referring to the attached figure 1, a furnace hearth atmosphere fluctuation pressurization replacement method of a continuous annealing furnace, wherein heat preservation cotton 2 and a stainless steel lining plate 3 are arranged on the inner wall of the continuous annealing furnace 1 and used for preserving and insulating heat of a furnace hearth; the continuous annealing furnace 1 is provided with a nitrogen replacement pipeline 4, and a nitrogen flow regulating valve 6 is arranged on the nitrogen replacement pipeline 4 and used for regulating the flow of the purging nitrogen; the furnace top diffusion regulating valve 7 is arranged on the furnace top diffusion pipeline 5 and is used for regulating the nitrogen replacement purging opening, and the furnace hearth atmosphere fluctuation pressurization replacement method of the continuous annealing furnace comprises the following steps:
firstly, after the annealing furnace is sealed, regulating the nitrogen injection amount through a nitrogen flow regulating valve 6 and regulating the opening degree of a furnace top diffusion regulating valve 7 to ensure that the internal atmosphere pressure of the hearth and the internal atmosphere pressure of the heat preservation cotton are subjected to internal atmosphere replacement of the hearth under the state of 200 ~ 300 Pa;
when the oxygen content of the atmosphere in the hearth is reduced to 7000 ~ 8000ppm, gradually increasing the nitrogen injection amount, and gradually reducing the opening degree of the furnace top diffusion regulating valve 7 until the atmosphere pressure in the hearth is increased to 600 ~ 800Pa, and the atmosphere pressure in the heat-preservation cotton is increased to 450 ~ 550 Pa;
keeping the nitrogen injection amount and the opening degree of the furnace top diffusion regulating valve 7 in the step II, continuously performing the atmosphere replacement inside the hearth until the pressure difference between the atmosphere inside the hearth and the atmosphere inside the heat preservation cotton is less than 10Pa, and continuously performing the atmosphere replacement inside the hearth for 10 ~ 15min in the state;
gradually reducing the nitrogen injection amount, and simultaneously gradually increasing the opening degree of the furnace top diffusion regulating valve 7 until the internal atmosphere pressure of the hearth is reduced to 320 ~ Pa and the internal atmosphere pressure of the heat-preservation cotton is 450 ~ Pa;
keeping the nitrogen injection amount and the opening degree of the furnace top diffusion regulating valve 7 in the step IV, continuously replacing the atmosphere inside the hearth until the pressure difference between the atmosphere inside the hearth and the atmosphere inside the heat preservation cotton is less than 10Pa, and continuously replacing the atmosphere inside the hearth for 3 ~ 5min under the state;
sixthly, repeating the step III to the step V, and starting to ignite and heat the continuous annealing furnace when the oxygen content of the atmosphere in the hearth is reduced to 300 ~ 500 ppm;
and seventhly, in the ignition temperature rise process of the continuous annealing furnace, repeating the step III-the step V at the same time, and finishing the fluctuation pressurization replacement of the furnace chamber atmosphere of the continuous annealing furnace when the oxygen content of the furnace chamber atmosphere is less than 200 ppm.
The specific embodiment is as follows:
in this embodiment, referring to fig. 1, a furnace atmosphere fluctuation pressurization replacement method for a continuous annealing furnace mainly comprises a continuous annealing furnace 1, heat preservation cotton 2, a stainless steel lining plate 3, a nitrogen replacement pipeline 4, a furnace top diffusion pipeline 5, a nitrogen flow regulating valve 6, a furnace top diffusion regulating valve 7, a furnace pressure transmitter 8, a heat preservation cotton internal pressure transmitter 9 and an atmosphere analyzer 10.
The heat preservation cotton 2 and the stainless steel lining plate 3 shown in figure 1 are arranged on the inner wall of the continuous annealing furnace 1 and are used for preserving and insulating the heat of a hearth;
a nitrogen flow rate regulating valve 6 shown in fig. 1 is installed on the nitrogen substitution line 4 for regulating the flow rate of the purge nitrogen; the furnace top diffusion regulating valve 7 is arranged on the furnace top diffusion pipeline 5 and is used for regulating the nitrogen replacement purging opening degree.
The furnace pressure transmitter 8 shown in FIG. 1 is installed on the continuous annealing furnace 1 for measuring the gas pressure inside the furnace; the pressure transmitter 9 inside the heat insulation cotton is arranged inside the heat insulation cotton 2 and used for adjusting the gas pressure inside the heat insulation cotton 2; the atmosphere analyzer 10 is used to detect the oxygen content of the atmosphere in the furnace.
The continuous annealing furnace hearth atmosphere fluctuation pressurization replacement method specifically comprises the following steps:
firstly, after the annealing furnace is sealed, constant-pressure hearth nitrogen replacement is carried out for 1 hour, namely during the hearth nitrogen replacement, the atmosphere pressure in the hearth is kept constant by adjusting the injection amount of nitrogen, and meanwhile, the top relief valve is opened to quickly replace the air in the hearth, wherein the injection amount of nitrogen is 4000 ~ 5000Nm3H, the internal atmosphere pressure of the hearth is 200 ~ 300Pa, the internal atmosphere pressure of the heat-preservation cotton is 200 ~ 300Pa, the difference between the internal atmosphere pressure of the hearth and the internal atmosphere pressure of the heat-preservation cotton is delta P =0, and the opening degree of the furnace top diffusion regulating valve 7 is 50%;
starting a furnace area furnace atmosphere fluctuation pressurization replacement mode after the oxygen content of the furnace area furnace atmosphere is reduced to 7000 ~ 8000 ppm;
③ increasing the nitrogen injection quantity to 5500 ~ 6500Nm step by step3H, gradually reducing the opening of a furnace top diffusion regulating valve 7 to 10 percent for 3 ~ 5min, and increasing the internal atmosphere pressure of the furnace chamber to 600 ~ 800Pa and the internal atmosphere pressure of the heat-preservation cottonWhen the pressure is 450 ~ 550Pa, keeping the current injection amount of nitrogen and the opening of the furnace top diffusion regulating valve 7, and ensuring that the pressure difference delta P between the internal atmosphere of the hearth and the internal atmosphere of the heat-preservation cotton is more than 0;
keeping various parameters in the state when the pressure difference delta P between the furnace atmosphere and the internal atmosphere of the heat preservation cotton is =0, wherein the keeping time is 10 ~ 15 min;
gradually reducing the nitrogen injection amount to 2800 ~ 3500 Nm3H, simultaneously gradually increasing the opening of the furnace top diffusion regulating valve 7 to 50 percent for 2 ~ 3min, keeping the current nitrogen injection amount and the opening of the furnace top diffusion regulating valve when the internal atmosphere pressure of the furnace hearth is reduced to 320 ~ 400Pa and the internal atmosphere pressure of the heat-preservation cotton is 450 ~ 550Pa, and at the moment, the difference between the internal atmosphere pressure of the furnace hearth and the internal atmosphere pressure of the heat-preservation cotton is less than 0;
when the pressure difference between the internal atmosphere pressure of the hearth and the internal atmosphere pressure of the heat preservation cotton is delta P =0, maintaining the parameters in the state for 3 ~ 5 min;
seventhly, repeating the step III to the step VI until the oxygen content of the atmosphere in the hearth is reduced to 300 ~ 500ppm, and starting to ignite and heat the continuous annealing furnace;
repeating the step III to the step VI while igniting and heating the continuous annealing furnace until the oxygen content of the atmosphere in the hearth is reduced to below 200ppm, thus completing the atmosphere fluctuation pressurization replacement mode of the hearth and recovering the normal use of nitrogen;
and ninthly, continuously heating the annealing furnace to the temperature required by the process, and recovering the normal production of the production line.
Claims (2)
1. A furnace hearth atmosphere fluctuation pressurization replacement method of a continuous annealing furnace is characterized in that heat insulation cotton (2) and a stainless steel lining plate (3) are arranged on the inner wall of the continuous annealing furnace (1) and used for heat insulation and heat insulation of a furnace hearth; the continuous annealing furnace (1) is provided with a nitrogen replacement pipeline (4), and a nitrogen flow regulating valve (6) is arranged on the nitrogen replacement pipeline (4) and used for regulating the flow of the purging nitrogen; furnace roof diffuse governing valve (7) are installed on furnace roof diffuse pipeline (5), are used for adjusting nitrogen gas replacement and sweep the aperture, its characterized in that: the continuous annealing furnace hearth atmosphere fluctuation pressurization replacement method comprises the following steps:
firstly, after the annealing furnace is sealed, adjusting the nitrogen injection amount and the opening degree of a furnace top diffusion adjusting valve (7) through a nitrogen flow adjusting valve (6), so that the internal atmosphere pressure of the hearth and the internal atmosphere pressure of the heat-preservation cotton are replaced under the condition of 200 ~ 300 Pa;
when the oxygen content of the atmosphere in the hearth is reduced to 7000 ~ 8000ppm, the nitrogen injection amount is gradually increased, and the opening degree of a furnace top diffusion regulating valve (7) is gradually reduced until the atmosphere pressure in the hearth is increased to 600 ~ 800Pa and the atmosphere pressure in the heat-preservation cotton is increased to 450 ~ 550 Pa;
keeping the nitrogen injection amount and the opening degree of the furnace top diffusion regulating valve (7) in the step II, continuously performing atmosphere replacement inside the hearth until the pressure difference between the atmosphere inside the hearth and the atmosphere inside the heat preservation cotton is less than 10Pa, and continuously performing atmosphere replacement inside the hearth for 10 ~ 15min under the state;
gradually reducing the nitrogen injection amount, and simultaneously gradually increasing the opening degree of a furnace top diffusion regulating valve (7) until the internal atmosphere pressure of the hearth is reduced to 320 ~ Pa and the internal atmosphere pressure of the heat-preservation cotton is 450 ~ Pa;
keeping the nitrogen injection amount and the opening degree of the furnace top diffusion regulating valve (7) in the step IV, continuously replacing the atmosphere in the hearth until the pressure difference between the atmosphere in the hearth and the atmosphere in the heat preservation cotton is less than 10Pa, and continuously replacing the atmosphere in the hearth for 3 ~ 5min under the state;
sixthly, repeating the step III to the step V, and starting to ignite and heat the continuous annealing furnace when the oxygen content of the atmosphere in the hearth is reduced to 300 ~ 500 ppm;
and seventhly, in the ignition temperature rise process of the continuous annealing furnace, repeating the step III-the step V at the same time, and finishing the fluctuation pressurization replacement of the furnace chamber atmosphere of the continuous annealing furnace when the oxygen content of the furnace chamber atmosphere is less than 200 ppm.
2. The method for replacing furnace hearth atmosphere of continuous annealing furnace by fluctuating pressurization according to claim 1, characterized in that the nitrogen injection amount in the step (r) is 4000 ~ 5000Nm and 5000Nm3/HThe opening degree of the furnace top diffusion regulating valve (7) is 50 percent;
the injection amount of the nitrogen in the step (II) is 4000 ~ 5000Nm and 5000Nm3Step-wise increase in/H to 5500 ~ 6500Nm3H, the opening degree of the furnace top diffusion regulating valve (7) is gradually reduced to 10 percent from 50 percent;
the injection amount of nitrogen in the step (c) is 5500 ~ 6500Nm3H, the opening degree of the furnace top diffusion regulating valve (7) is 10 percent;
the injection amount of the nitrogen in the step (iv) is from 5500 ~ 6500Nm3Stepwise reduction of/H to 2800 ~ 3500 Nm3H, the opening degree of the furnace top diffusion regulating valve (7) is gradually increased from 10% to 50%;
the injection amount of nitrogen in the step (v) is 2800 ~ 3500 Nm3And H, the opening degree of the furnace top diffusion regulating valve (7) is 50 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910815992.6A CN110643805B (en) | 2019-08-30 | 2019-08-30 | Furnace chamber atmosphere fluctuation pressurization replacement method for continuous annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910815992.6A CN110643805B (en) | 2019-08-30 | 2019-08-30 | Furnace chamber atmosphere fluctuation pressurization replacement method for continuous annealing furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110643805A true CN110643805A (en) | 2020-01-03 |
| CN110643805B CN110643805B (en) | 2021-03-26 |
Family
ID=69009898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910815992.6A Active CN110643805B (en) | 2019-08-30 | 2019-08-30 | Furnace chamber atmosphere fluctuation pressurization replacement method for continuous annealing furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110643805B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114231704A (en) * | 2021-12-20 | 2022-03-25 | 本钢板材股份有限公司 | Method for quickly replacing atmosphere in vertical annealing furnace |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215412A (en) * | 2013-04-22 | 2013-07-24 | 中冶南方(武汉)威仕工业炉有限公司 | Safety valve device for stainless steel bright annealing furnace |
| CN104212952A (en) * | 2013-06-03 | 2014-12-17 | 上海梅山钢铁股份有限公司 | Subsection blowing control method of atmosphere in vertical continuous annealing furnace |
| CN108070707A (en) * | 2016-11-15 | 2018-05-25 | 上海梅山钢铁股份有限公司 | A kind of method of the quick furnace lifting of vertical continuous annealing furnace |
| CN208536621U (en) * | 2018-06-13 | 2019-02-22 | 山东剑桥新型材料有限公司 | A kind of annealing furnace furnace atmosphere exchange system |
-
2019
- 2019-08-30 CN CN201910815992.6A patent/CN110643805B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215412A (en) * | 2013-04-22 | 2013-07-24 | 中冶南方(武汉)威仕工业炉有限公司 | Safety valve device for stainless steel bright annealing furnace |
| CN104212952A (en) * | 2013-06-03 | 2014-12-17 | 上海梅山钢铁股份有限公司 | Subsection blowing control method of atmosphere in vertical continuous annealing furnace |
| CN108070707A (en) * | 2016-11-15 | 2018-05-25 | 上海梅山钢铁股份有限公司 | A kind of method of the quick furnace lifting of vertical continuous annealing furnace |
| CN208536621U (en) * | 2018-06-13 | 2019-02-22 | 山东剑桥新型材料有限公司 | A kind of annealing furnace furnace atmosphere exchange system |
Non-Patent Citations (2)
| Title |
|---|
| 周恒龙 等: ""连续退火炉炉内露点温度高故障分析与控制"", 《金属世界》 * |
| 李勇: "铝合金时效退火炉充氮工艺分析", 《工业炉》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114231704A (en) * | 2021-12-20 | 2022-03-25 | 本钢板材股份有限公司 | Method for quickly replacing atmosphere in vertical annealing furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110643805B (en) | 2021-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104212952B (en) | The subsection blowing control method of atmosphere in vertical continuous annealing furnace stove | |
| CN110643805B (en) | Furnace chamber atmosphere fluctuation pressurization replacement method for continuous annealing furnace | |
| CN103555924B (en) | Atmosphere replacement system of continuous annealing furnace | |
| EP2871247B1 (en) | Method for operating blast furnace | |
| EP2434026B1 (en) | Continuous annealing furnace | |
| KR100964904B1 (en) | Heater for annealing furnace | |
| CN103205515A (en) | System and method for injecting coke oven gas into blast furnace | |
| CN114350866B (en) | Blast furnace blowing-out method for full-oxygen rapid blowing-out | |
| CN201811590U (en) | Embedded methanol drop-feeding decomposing furnace | |
| CN108659889B (en) | Cold-standby start-up process method for BGL gasification furnace | |
| CN109797271B (en) | Method for quickly producing continuous annealing furnace again | |
| US4398971A (en) | Method of heating, holding or heat treatment of metal material | |
| CN111218627A (en) | High-temperature metal annealing process | |
| CN103740873B (en) | A kind of system for blast furnace ironmaking | |
| EP3330387B1 (en) | Apparatus for blowing dust coal of melting furnace | |
| JP6604343B2 (en) | Preheating gas blowing method, blast furnace operating method, and oxygen blast furnace operating method | |
| JPS581163B2 (en) | Blast furnace operating method | |
| CN104791843B (en) | Cold-state prefiring gas replacement operation method of full gas fired boiler | |
| CN211896818U (en) | Shell gasification furnace for eliminating annular space temperature fluctuation | |
| CN219572720U (en) | Sulfur recovery shutdown hot nitrogen sulfur blowing device | |
| CN219898177U (en) | Hexafluoropropylene schizolysis automatic control system | |
| US20240077255A1 (en) | Method for operating a blast furnace plant | |
| EP2527772B1 (en) | Heating apparatus | |
| CN102071062B (en) | Method for Texaco gasification process oven | |
| JP6468272B2 (en) | Lance protection method in blast furnace tuyeres lance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |