CN111020170A - Process for cleaning inner cover of bell-type annealing furnace - Google Patents
Process for cleaning inner cover of bell-type annealing furnace Download PDFInfo
- Publication number
- CN111020170A CN111020170A CN201911326905.7A CN201911326905A CN111020170A CN 111020170 A CN111020170 A CN 111020170A CN 201911326905 A CN201911326905 A CN 201911326905A CN 111020170 A CN111020170 A CN 111020170A
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- Prior art keywords
- annealing furnace
- inner cover
- cover
- valve
- furnace
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- 238000000137 annealing Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004140 cleaning Methods 0.000 title claims abstract description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 59
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 238000004321 preservation Methods 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 239000001257 hydrogen Substances 0.000 claims abstract description 19
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 19
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000005406 washing Methods 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- 238000010926 purge Methods 0.000 claims description 4
- 230000004888 barrier function Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract description 2
- 239000000428 dust Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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
- C21D9/52—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
- C21D9/663—Bell-type furnaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
-
- 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
- Y02P10/20—Recycling
Abstract
The invention relates to a process for cleaning an inner cover of a cover type annealing furnace, belonging to the technical field of cold-rolled sheet strip coil cover type annealing furnace equipment in the metallurgical industry. The technical scheme is as follows: loading a convection plate and a steel coil with the stacking height more than half or the whole furnace on an annealing furnace platform, rapidly heating in a nitrogen low-flow mode, then preserving heat for a period of time, introducing compressed air during the heat preservation period, closing the compressed air after the heat preservation is finished, and normally cooling and discharging in a nitrogen mode; then washing the residues on the inner wall of the inner cover by using high-pressure water; and finally, carrying out secondary annealing in a hydrogen mode to reduce the oxidized part of the inner cover, the furnace platform, the convection plate or the scrap steel coil. The invention has the beneficial effects that: the inner cover of the annealing furnace is cleaned regularly, the annealing efficiency is improved, and the defects of roller damage and bright lines are prevented when a post-procedure leveling machine is produced.
Description
Technical Field
The invention relates to a process for cleaning an inner cover of a cover type annealing furnace, belonging to the technical field of cold-rolled sheet strip coil cover type annealing furnace equipment in the metallurgical industry.
Background
At present, after a bell-type annealing inner cover is used for a long time in the production process of a cold-rolled sheet, a layer of deposited dust and carbon powder are attached to the surface of the inner wall of the inner cover, so that the heat transfer effect of the inner cover wall is reduced, the energy consumption is increased, the annealing efficiency is reduced, and the inner cover wall is embrittled due to carburization. When the accumulated dust and carbon powder are accumulated to a certain degree, the inner cover is lifted out and buckled, foreign matters attached to the inner wall fall off to the end face of the cold-rolled sheet strip coil, and when the post-process temper mill is used for production, the defects of roller damage and bright lines can be generated, and the product quality is influenced.
Disclosure of Invention
The invention aims to provide a process for cleaning an inner cover of a cover type annealing furnace, which is used for periodically cleaning the inner cover of the annealing furnace, improving the annealing efficiency, preventing the defects of roller damage and bright lines generated during the production of a flattening machine in the subsequent process and solving the problems in the background technology.
The technical scheme of the invention is as follows:
a process for cleaning an inner cover of a hood-type annealing furnace is characterized in that: comprises the following steps:
the method comprises the following steps that firstly, convection discs and steel coils are alternately stacked on an annealing furnace barrier hearth, an inner cover is buckled on the annealing furnace hearth, a heating cover is buckled on the annealing furnace hearth, a nitrogen valve and a compressed air valve are opened, a hydrogen valve and an evacuation valve are closed, nitrogen and compressed air are injected into an annealing furnace, the heating cover is electrified to be rapidly heated at the same time, heat preservation is carried out after the set temperature is reached, the compressed air valve is closed after the heat preservation is finished, the heating cover is lifted out, a cooling cover is buckled on the annealing furnace hearth, water cooling and air cooling are carried out, when the temperature in the inner cover is reduced to a set value, the evacuation valve is opened, the nitrogen valve is closed, the cooling cover, the inner cover, the convection discs and the steel coils are lifted out, and the annealing furnace hearth and the convection discs are manually cleaned;
secondly, inserting the collecting pipe into the fixed seat, connecting the hose with the collecting pipe, covering the collecting pipe by the inner cover from top to bottom, starting the water pump to spray circulating water onto the inner wall of the inner cover, washing away carbon powder and accumulated dust on the inner wall of the inner cover, and then drying the carbon powder and the accumulated dust;
and thirdly, loading the same convection plate or waste strip steel as the first step into the same annealing furnace base, covering the dried inner cover on the annealing furnace base, covering the heating cover on the annealing furnace base, opening a hydrogen valve, closing a nitrogen valve, a compressed air valve and an evacuation valve, filling hydrogen into the annealing furnace, simultaneously electrifying the heating cover for rapid heating, preserving heat after the set temperature is reached, hanging out the heating cover after the heat preservation is finished, covering the cooling cover on the annealing furnace base, carrying out water cooling and air cooling, opening the evacuation valve, closing the hydrogen valve, hanging out the cooling cover, the inner cover, the convection disc and the steel coil when the temperature in the inner cover is reduced to the set value, and manually cleaning the annealing furnace base and the convection disc.
In the first step, the stacking height of the convection disc and the steel coil exceeds a half of that of the annealing furnace.
In the first step and the third step, after the heating hood is buckled on a furnace platform of an annealing furnace, the heating hood is pressed by nitrogen until the pressure in the furnace is 50MPa for sealing inspection, after the sealing inspection is passed, nitrogen is filled into the furnace for purging for one hour at the flow rate of 120 m/h, the furnace is heated to 450 ℃ at the speed of 150 ℃/h under the premise of ensuring the furnace pressure of 50MPa, the heat preservation is started, compressed air is filled at the flow rate of 20 m/h while the heat preservation is carried out, the compressed air is closed after the heat preservation is carried out for 5 hours, the nitrogen is filled into the furnace for replacing the air in the furnace at the flow rate of 120 m/h, and finally, the temperature is reduced and the.
The pressure of the circulating water in the second collecting pipe is 20-25 MPa.
The invention has the beneficial effects that: loading a convection plate and a steel coil with the stacking height more than half or the whole furnace on an annealing furnace platform, rapidly heating in a nitrogen low-flow mode, then preserving heat for a period of time, introducing compressed air during the heat preservation period, closing the compressed air after the heat preservation is finished, and normally cooling and discharging in a nitrogen mode; then washing the residues on the inner wall of the inner cover by using high-pressure water; and finally, carrying out secondary annealing in a hydrogen mode, and aiming at reducing the oxidized part of the inner cover, the furnace platform, the convection plate or the scrap steel coil, thereby improving the annealing efficiency and preventing the defects of roller damage and bright lines during the production of a post-procedure leveling machine.
Drawings
FIG. 1 is a schematic view of a first step of the present invention;
FIG. 2 is a schematic diagram of the second step of the present invention:
FIG. 3 is a schematic diagram of a third step of the present invention:
in the figure: the device comprises an inner cover 1, a collecting pipe 2, a nozzle 3, a fixed seat 4, a hose 5, a water pump 6, an annealing furnace hearth 11, a hydrogen valve 12, a nitrogen valve 13, a compressed air valve 14, a heating cover 15, a convection disc 16, a steel coil 17, an emptying valve 18 and a cooling cover 19.
Detailed Description
The invention is further illustrated by way of example in the following with reference to the accompanying drawings.
Referring to the attached figures 1-3, a process for cleaning an inner cover of a hood-type annealing furnace is characterized in that: comprises the following steps:
firstly, alternately stacking a convection disc 16 and a steel coil 17 on an annealing furnace barrier hearth 11, covering an inner cover 1 on the annealing furnace hearth 11, covering a heating cover 15 on the annealing furnace hearth 11, opening a nitrogen valve 13 and a compressed air valve 14, closing a hydrogen valve 12 and an evacuation valve 18, filling nitrogen and compressed air into an annealing furnace, simultaneously electrifying the heating cover 15 for rapid heating, preserving heat after a set temperature is reached, closing the compressed air valve 14 after the heat preservation is finished, hanging the heating cover 15, covering a cooling cover 19 on the annealing furnace hearth 11, carrying out water cooling and air cooling, opening the evacuation valve 18, closing the nitrogen valve 13, hanging the cooling cover 19, the steel coil 1, the convection disc 16 and the annealing furnace 17 when the temperature in the inner cover 1 is reduced to a set value, and manually cleaning the annealing furnace hearth 11 and the convection disc 16;
secondly, inserting the collecting pipe 2 into the fixed seat 4, connecting the hose 5 with the collecting pipe 2, covering the collecting pipe 2 by the inner cover 1 from top to bottom, starting the water pump 6 to spray circulating water onto the inner wall of the inner cover 1, washing away carbon powder and deposited ash on the inner wall of the inner cover 1, and then drying;
and thirdly, loading the same convection plate 16 or waste strip steel as the first step into the same annealing furnace base 11, covering the dried inner cover 1 on the annealing furnace base 11, covering the heating cover 15 on the annealing furnace base 11, opening the hydrogen valve 12, closing the nitrogen valve 13, the compressed air valve 14 and the evacuation valve 18, filling hydrogen into the annealing furnace, simultaneously electrifying the heating cover 15 for rapid heating, preserving heat after the set temperature is reached, hanging the heating cover 15, covering the cooling cover 19 on the annealing furnace base 11, carrying out water cooling and air cooling, opening the evacuation valve 18 when the temperature in the inner cover 1 is reduced to the set value, closing the hydrogen valve 12, hanging the cooling cover 19, the annealing furnace base 11 and the convection coil 16, and manually cleaning the annealing furnace base 11 and the convection coil 16.
The specific embodiment is as follows:
in this embodiment, referring to fig. 1, in a first step, a convection plate or a scrap coil with a stacking height of more than half or the entire furnace is loaded on a trouble-free annealing furnace platform, an inner cover and a heating cover are fastened, a sealing test is performed by punching nitrogen gas to a pressure of about 50MPa in the furnace, after the sealing test is passed, the furnace is purged with nitrogen gas at a flow rate of 120 m/h for one hour, the furnace is heated to 450 ℃ at a speed of 150 ℃/h while ensuring a furnace pressure of about 50MPa, heat preservation is started, compressed air is simultaneously pumped at a flow rate of 20 m/h, the compressed air is closed after the heat preservation is performed for 5 hours, the furnace is replaced with nitrogen gas at a flow rate of 120 m/h, and finally the furnace is cooled and taken out normally in a nitrogen mode;
referring to the attached figure 2, in the second step, the inner wall of the inner cover after the first step of heating is washed by high-pressure fire-fighting water with the working pressure of 20-25 MPa, and the oxidation residues attached to the inner wall after annealing are completely washed.
Referring to the attached figure 3, in the third step, the same convection plate or waste steel strip as in the first step is loaded on the same furnace platform, secondary annealing is performed in a hydrogen mode, so as to reduce the oxidized part of the inner cover, the furnace platform equipment, the convection plate or the waste steel strip coil, the inner cover and the heating cover are buckled, the inner cover and the heating cover are pressed by nitrogen until the pressure in the furnace is about 50MPa for tightness inspection, after the tightness inspection is passed, the nitrogen purging furnace heated to about 50 ℃ is filled at 120m year/h flow rate for one hour, the nitrogen purging furnace is heated to 450 ℃ at 150 ℃/h speed on the premise of ensuring the furnace pressure to about 50MPa, heat preservation is started, hydrogen is filled at 20m year/h flow rate while heat preservation is performed, the hydrogen is closed after heat preservation is performed for 5 hours, the nitrogen is filled at 120m year/h flow rate to replace the hydrogen in the furnace, and finally, the temperature is.
Claims (4)
1. A process for cleaning an inner cover of a hood-type annealing furnace is characterized in that: comprises the following steps:
firstly, alternately stacking a convection current disc (16) and a steel coil (17) on an annealing furnace barrier hearth (11), then buckling an inner cover (1) on the annealing furnace hearth (11), then buckling a heating cover (15) on the annealing furnace hearth (11), opening a nitrogen valve (13) and a compressed air valve (14), closing a hydrogen valve (12) and an emptying valve (18), flushing nitrogen and compressed air into the annealing furnace, simultaneously electrifying the heating cover (15) for rapid heating, preserving heat after reaching a set temperature, closing the compressed air valve (14), hanging out the heating cover (15), buckling a cooling cover (19) on the annealing furnace hearth (11), carrying out water cooling and air cooling, opening the emptying valve (18) when the temperature in the inner cover (1) drops to the set temperature, closing the nitrogen valve (13), hanging out the cooling cover (19), The inner cover (1), the convection disc (16) and the steel coil (17), and the annealing furnace hearth (11) and the convection disc (16) are manually cleaned;
secondly, inserting the collecting pipe (2) into the fixed seat (4), connecting the hose (5) with the collecting pipe (2), covering the collecting pipe (2) by the inner cover (1) from top to bottom, starting the water pump (6) to spray circulating water onto the inner wall of the inner cover (1), washing away carbon powder and deposited ash on the inner wall of the inner cover (1), and then airing;
thirdly, a convection plate (16) or waste strip steel which is the same as that in the first step is arranged in the same annealing furnace base (11), the dried inner cover (1) is buckled on the annealing furnace base (11), then a heating cover (15) is buckled on the annealing furnace base (11), a hydrogen valve (12) is opened, a nitrogen valve (13), a compressed air valve (14) and an emptying valve (18) are closed, hydrogen is filled into the annealing furnace, the heating cover (15) is electrified to carry out rapid heating at the same time, heat preservation is carried out after the set temperature is reached, the heating cover (15) is lifted out after the heat preservation is finished, a cooling cover (19) is buckled on the annealing furnace base (11) for water cooling and air cooling, when the temperature in the inner cover (1) is reduced to the set value, the emptying valve (18) is opened, the hydrogen valve (12) is closed, the cooling cover (19), the inner cover (1), a convection disc (16) and a steel coil (17) are lifted out, the furnace platform (11) and the convection disc (16) of the annealing furnace are cleaned manually.
2. The process for cleaning an inner cover of a hood-type annealing furnace according to claim 1, wherein: in the first step, the stacking height of the convection disc (16) and the steel coil (17) exceeds half of the annealing furnace.
3. The process for cleaning an inner cover of a hood-type annealing furnace according to claim 2, wherein: in the first step and the third step, after a heating hood (15) is buckled on a furnace platform (11) of an annealing furnace, the sealing performance is checked under the condition that the pressure in the annealing furnace is 50MPa through nitrogen stamping, after the sealing inspection is passed, nitrogen is filled into the annealing furnace at a flow rate of 120 m/h for purging the annealing furnace for one hour, the annealing furnace is heated to 450 ℃ at a speed of 150 ℃/h under the premise of ensuring the furnace pressure of 50MPa, the heat preservation is started, compressed air is filled at a flow rate of 20m for year/h while the heat preservation is carried out, the compressed air is closed after the heat preservation is carried out for 5 hours, the nitrogen is filled into the annealing furnace at a flow rate of 120m for year/h for replacing the air in.
4. The process for cleaning an inner cover of a hood-type annealing furnace according to claim 1, wherein: the pressure of the circulating water in the second-step collecting pipe (2) is 20-25 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911326905.7A CN111020170B (en) | 2019-12-20 | 2019-12-20 | Process for cleaning inner cover of bell-type annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911326905.7A CN111020170B (en) | 2019-12-20 | 2019-12-20 | Process for cleaning inner cover of bell-type annealing furnace |
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| Publication Number | Publication Date |
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| CN111020170A true CN111020170A (en) | 2020-04-17 |
| CN111020170B CN111020170B (en) | 2021-10-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646434A (en) * | 2022-03-20 | 2022-06-21 | 山西太钢不锈钢股份有限公司 | Automatic detection device for air tightness of all-hydrogen bell-type furnace load space and use method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB348859A (en) * | 1929-05-01 | 1931-05-21 | Siemens-Schuckertwerke Aktiengesellschaft | |
| US1938306A (en) * | 1931-05-04 | 1933-12-05 | Eastwood Nealley Corp | Annealing furnace |
| JPS62247034A (en) * | 1986-04-18 | 1987-10-28 | Kawasaki Steel Corp | Tight annealing method for coil of steel strip |
| JPH0978144A (en) * | 1995-09-07 | 1997-03-25 | Sumitomo Metal Ind Ltd | Method for furnace purging in bell-type batch annealing furnace |
| CN206838622U (en) * | 2017-06-09 | 2018-01-05 | 邯钢集团衡水薄板有限责任公司 | A kind of bell type annealing furnace internal casing cleaning device |
-
2019
- 2019-12-20 CN CN201911326905.7A patent/CN111020170B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB348859A (en) * | 1929-05-01 | 1931-05-21 | Siemens-Schuckertwerke Aktiengesellschaft | |
| US1938306A (en) * | 1931-05-04 | 1933-12-05 | Eastwood Nealley Corp | Annealing furnace |
| JPS62247034A (en) * | 1986-04-18 | 1987-10-28 | Kawasaki Steel Corp | Tight annealing method for coil of steel strip |
| JPH0978144A (en) * | 1995-09-07 | 1997-03-25 | Sumitomo Metal Ind Ltd | Method for furnace purging in bell-type batch annealing furnace |
| CN206838622U (en) * | 2017-06-09 | 2018-01-05 | 邯钢集团衡水薄板有限责任公司 | A kind of bell type annealing furnace internal casing cleaning device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646434A (en) * | 2022-03-20 | 2022-06-21 | 山西太钢不锈钢股份有限公司 | Automatic detection device for air tightness of all-hydrogen bell-type furnace load space and use method |
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| Publication number | Publication date |
|---|---|
| CN111020170B (en) | 2021-10-15 |
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Address after: 053400 New District of Wuyi County, Hengshui City, Hebei Province (southwest of huanlongzhuang Village) Patentee after: Hengshui Board Packaging Materials Technology Co.,Ltd. Address before: 053400 southwest of New District (huanlongzhuang Village), Wuyi County, Hengshui City, Hebei Province Patentee before: HBIS GROUP HENGSHUI PLATE INDUSTRY CO.,LTD. |
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