CN102716921B - Use method of cleaning section alkali liquor on continuous annealing production line - Google Patents
Use method of cleaning section alkali liquor on continuous annealing production line Download PDFInfo
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- CN102716921B CN102716921B CN201210211568.9A CN201210211568A CN102716921B CN 102716921 B CN102716921 B CN 102716921B CN 201210211568 A CN201210211568 A CN 201210211568A CN 102716921 B CN102716921 B CN 102716921B
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Abstract
The invention discloses a use method of cleaning section alkali liquor on a continuous annealing production line. The method comprises the following steps that when the conductivity and the liquid level of the alkali liquor cleaning section are controlled, the flowing direction of cleaning agents along the alkali liquor cleaning section is opposite to the moving direction of band steel, and the alkali liquor cleaning section comprises an electrolysis cleaning section and a spray brushing washing section; and when the liquid level of the spray brushing washing section is controlled, the alkali liquor of the electrolysis cleaning section flows to the spray brushing cleaning section. The use method of the cleaning section alkali liquor on the continuous annealing production line provided by the invention has the advantages that desalted water and band steel completely realize reverse cleaning, new alkali liquor is prepared in the electrolysis cleaning section, the gradual cleaning of the alkali liquor is ensured, the water quality of subsequent groove bodies is obviously improved, and the surface quality requirement of the band steel is improved.
Description
Technical field
The present invention relates to cold rolled sheet cleaning and degreasing technical field, particularly a kind of using method of cleaning section alkali lye on continuous annealing production line.
Background technology
Belt steel surface total residual after cold rolling some ROLLING OIL, iron powder and other pollutant.Cleaning section is exactly by the removing residues of Cold-strip Steel Surface, ensure the cleaning quality of band steel, and the clean-up performance of alkali lye is most important for the surface quality of product.
In cold-rolling continuous annealing cleaning section, cleaning section technology groove is mainly divided into No. 1 spary to wash, No. 2 sparies are washed, electrolytic cleaned, No. 3 brush machines, rinsing.Its process chart as shown in Figure 1, cleaning section technology groove correspond to No. 1 alkali lye circulating slot, No. 2 alkali lye circulating slots, electrolytic lye circulating slot, No. 3 brush machine circulating slots, rinse cycle grooves respectively, the flow direction of its alkali lye as shown in Figure 1, former design Problems existing is that 1, No. 2 spary is washed and to be become 2 isolated cell bodies with electrolysis, between do not have pipeline to connect, more cannot realize automatic control.To carry out in the process of cleaning in cleaning section with steel, due to the continuous accumulation of belt steel surface greasy filth, alkali lye is dirty gradually, particularly electrolysis section, the consequence brought is: 1. electrolysis section alkali lye can enter the desalted water circulating slot of No. 3 brush machines and rinsing with band steel, electrolysis section alkali lye is dirtier, more serious to water pollution below, reduces cleaning quality; 2. electrolytic cell is as an isolated cell body, needs to clean out a large amount of greasy filth, ensure the spatter property of alkali lye during maintenance; 3. in order to keep the spatter property of alkali lye, the alkali lye often simultaneously discharging No. 1 circulating slot and electrolytic cell to ensure to be with the cleaning quality of steel.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of using method of cleaning section alkali lye on continuous annealing production line, solves traditional electrolysis and spary soda liquid independently cleaning dirty, alkali lye consumption is high, technique cleaning labour intensity the is large defect brought of cleaning model.
For solving the problems of the technologies described above, the invention provides a kind of using method of cleaning section alkali lye on continuous annealing production line, comprise: when controlling electrical conductivity and the liquid level of caustic dip section, make cleaning agent contrary with the direction of motion of band steel along the flow direction of caustic dip section, described caustic dip section comprises electrolytic cleaned section and spray brushing stage; When controlling the liquid level of spray brushing stage, make the alkaline stream of electrolytic cleaned section to spray brushing stage.
The using method of cleaning section alkali lye on continuous annealing production line provided by the invention, desalted water and the complete reverse cleaning of band steel, new alkali lye is configured in electrolytic cleaned section, ensure that alkali lye cleans gradually, the water quality of cell body below is obviously improved, improves the requirement of strip surface quality.
Accompanying drawing explanation
The cleaning section technological process of the using method of cleaning section alkali lye on continuous annealing production line that Fig. 1 provides for the embodiment of the present invention;
The schematic flow sheet of the using method of cleaning section alkali lye on continuous annealing production line that Fig. 2 provides for the embodiment of the present invention.
Detailed description of the invention
See Fig. 1 and Fig. 2, the using method of cleaning section alkali lye on continuous annealing production line that the embodiment of the present invention provides, wherein, cleaning section comprises caustic dip section and desalted water cleaning section and drying section, caustic dip section comprises electrolytic cleaned section and spray brushing stage, and desalted water cleaning section comprises rinsing section and brush machine section; Further, rinsing section, brush machine section, electrolytic cleaned section and spray brushing stage arrange by the direction contrary with the band steel direction of motion.The method comprises: when controlling electrical conductivity or the liquid level of caustic dip section circulating slot, and make cleaning agent contrary with the direction of motion of band steel along the flow direction of caustic dip section, detergent package is containing alkali lye and desalted water.When controlling the liquid level of spray brushing stage circulating slot, make the alkaline stream of electrolytic cleaned section to spray brushing stage;
Wherein, the electrical conductivity controlling caustic dip section comprises: under the electrical conductivity of caustic dip section circulating slot is lower than its electrical conductivity in limited time, add alkali lye toward this caustic dip section circulating slot.
The liquid level controlling caustic dip section comprises: when the liquid level of caustic dip section circulating slot is prescribed a time limit lower than the lower of its liquid level, by with the circulating slot being with alkali lye that the steel direction of motion is the preceding adjacent caustic dip section of benchmark to add this caustic dip section, or the desalted water of brush machine section is added the circulating slot of this caustic dip section;
The electrical conductivity and the liquid level that control caustic dip section comprise: while lower limit lower than its electrical conductivity of the electrical conductivity of caustic dip section circulating slot, liquid level is also prescribed a time limit lower than the lower of its liquid level, first by be with the steel direction of motion to add this caustic dip section for the alkali lye of the preceding adjacent cleaning section of benchmark, or add desalted water, then add alkali lye toward this caustic dip section.
Wherein, electrolytic cleaned section, spray brushing stage alkali lye separately recycle separately.
Here is the concrete operations of the using method of cleaning section alkali lye on continuous annealing production line that the embodiment of the present invention provides:
First band steel enters No. 1 spray brushing stage, immerse in the alkali lye of this section of circulating slot, clean, and scrubbed by No. 1 brush machine, then after squeeze roll is extracted, enter No. 2 spray brushing stages, immerse in the alkali lye of this section of circulating slot, clean, and scrubbed by No. 2 brush machines, then again after squeeze roll is extracted, enter electrolytic cleaned section and carry out electrolytic cleaned, remove the spot of band steel recess; After alkali lye section has been cleaned, enter desalted water wash phase, clean in brush machine section, rinsing section successively, finally enter drying section and dry.
In cleaning process, be ensure cleaning performance, the electrical conductivity of the alkali lye of spray brushing stage, electrolytic cleaned section and liquid level must be made to reach the bound of each circulating slot, namely following table is each electrical conductivity of cleaning section circulating slot and the bound of liquid level or target zone:
Below the electrical conductivity of caustic dip section circulating slot and the control method of liquid level:
1, as the lower limit 40ms/cm of alkali lye circulating slot electrical conductivity lower than this groove electrical conductivity of No. 1 spray brushing stage, add alkali lye, make No. 1 alkali lye circulating slot electrical conductivity of spraying brushing stage reach 40-50ms/cm.The cycle detection time, for adding 6 seconds alkali lye, stops 50 seconds, reciprocation cycle, until electrical conductivity reaches 40-50ms/cm.
2, as the lower limit 40ms/cm of alkali lye circulating slot electrical conductivity lower than this groove electrical conductivity of No. 2 spray brushing stages, add new alkali lye, make No. 2 alkali lye circulating slot electrical conductivity of spraying brushing stages reach 40-50ms/cm.The cycle detection time is, adds 6 seconds new alkali lye, stops 50 seconds, reciprocation cycle, until electrical conductivity reaches 40-50ms/cm.
3, when the alkali lye circulating slot liquid level of No. 1 spray brushing stage is lower than the lower limit of this tank liquor position, namely this circulating slot degree of depth 40% time, pay the utmost attention to the alkali lye of the circulating slot of No. 2, interpolation spray brushing stage, be secondly No. 3 brush machine desalted waters, can also be added the two simultaneously.If the addition manner of one of both is manual mode, then system can select the automatic interpolation supplement mode of another automatically.When liquid level is lower than low alarm liquid level, add new desalted water.
4, when the alkali lye circulating slot liquid level of No. 2 spray brushing stages is lower than the lower limit of this tank liquor position, namely this circulating slot degree of depth 40% time, paying the utmost attention to the circulating slot alkali lye adding electrolytic cleaned section, is secondly No. 3 brush machine desalted waters, can also add the two simultaneously.If the addition manner of one of both is manual mode, then system can select the automatic interpolation arbitrary way of another automatically.When liquid level is lower than low alarm liquid level, add new desalted water.
5, while the lower limit of circulating slot liquid level lower than this tank liquor position of No. 1 spray brushing stage, namely this circulating slot degree of depth 40%, during the lower limit 40ms/cm of electrical conductivity also lower than this groove electrical conductivity, first the alkali lye of circulating slot of No. 2 spray brushing stages should be added the circulating slot of No. 1 spray brushing stage or add desalted water and supplement liquid level, then considering whether add new alkali lye according to electrical conductivity size.
6, while the lower limit of circulating slot liquid level lower than this tank liquor position of No. 2 spray brushing stages, namely this circulating slot degree of depth 40%, during the lower limit 40ms/cm of electrical conductivity also lower than this groove electrical conductivity, first the alkali lye of the circulating slot of electrolytic cleaned section or desalted water should be added No. 2 spray brushing stages and supplement liquid level, then consider whether add new alkali lye according to electrical conductivity.
7, as lower limit 50ms/cm lower than this groove electrical conductivity of the circulating slot electrical conductivity of electrolytic cleaned section, directly add alkali lye and regulate, make it reach 50-80ms/cm.
The using method of cleaning section alkali lye on continuous annealing production line provided by the invention, desalted water, both alkali lye and the complete reverse cleaning of band steel, and automatically control the adverse current of alkali lye.If the liquid level of certain circulation cell body lower than its liquid level lower limit time, by circulating below, cell body automatic powder adding adds alkali lye; If liquid level stops adding alkali lye higher than the upper of its liquid level in limited time, use control program to realize the reverse cleaning of alkali lye, thus ensure that alkali lye cleans gradually, the water quality of cell body below is obviously improved, improve the requirement of strip surface quality.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (3)
1. the using method of cleaning section alkali lye on continuous annealing production line, is characterized in that, comprise:
When controlling electrical conductivity or the liquid level of caustic dip section, make cleaning agent contrary with the direction of motion of band steel along the flow direction of caustic dip section, described caustic dip section comprises electrolytic cleaned section and spray brushing stage;
Wherein, when controlling the liquid level of spray brushing stage, make the alkaline stream of described electrolytic cleaned section to spray brushing stage;
The electrical conductivity of described control caustic dip section comprises: under the electrical conductivity of caustic dip section is lower than its electrical conductivity in limited time, adds alkali lye toward this caustic dip section;
The liquid level of described control caustic dip section comprises: when caustic dip section liquid level lower than its liquid level lower in limited time, by be with the steel direction of motion to add this caustic dip section for the alkali lye of the preceding adjacent cleaning section of benchmark, or add desalted water.
2. the using method of cleaning section alkali lye on continuous annealing production line as claimed in claim 1, it is characterized in that, the liquid level of described control caustic dip section comprises the liquid level upper limit controlling described caustic dip section is described caustic dip section full load 50%, and its lower limit is 40%.
3. the using method of cleaning section alkali lye on continuous annealing production line as claimed in claim 1 or 2, it is characterized in that, electrical conductivity and the liquid level of described control caustic dip section comprise:
While lower limit lower than its electrical conductivity of the electrical conductivity of caustic dip section, liquid level is also prescribed a time limit lower than the lower of its liquid level, first liquid level is controlled, by to be with the steel direction of motion to add this caustic dip section for the alkali lye of the preceding adjacent cleaning section of benchmark, or add desalted water, then control electrical conductivity, under the electrical conductivity of caustic dip section is lower than its electrical conductivity in limited time, add alkali lye toward this caustic dip section.
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| CN201210211568.9A CN102716921B (en) | 2012-06-20 | 2012-06-20 | Use method of cleaning section alkali liquor on continuous annealing production line |
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| CN201210211568.9A CN102716921B (en) | 2012-06-20 | 2012-06-20 | Use method of cleaning section alkali liquor on continuous annealing production line |
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| CN102716921B true CN102716921B (en) | 2015-02-25 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106757295B (en) * | 2015-11-19 | 2020-05-19 | 日铁工程技术株式会社 | Electrolytic cleaning device and control method for electrolytic cleaning device |
| CN106757099B (en) * | 2015-11-19 | 2020-03-27 | 新日铁住金工程技术株式会社 | Cleaning device for steel strip processing equipment and control method thereof |
| CN106077112B (en) * | 2016-06-22 | 2019-04-09 | 首钢京唐钢铁联合有限责任公司 | Method for reducing consumption of desalted water and steam for cleaning degreasing unit |
| CN108405641B (en) * | 2018-02-27 | 2019-09-20 | 首钢京唐钢铁联合有限责任公司 | Method for controlling alkali liquor in cold-rolled strip steel cleaning section |
| CN113862685A (en) * | 2021-08-23 | 2021-12-31 | 山东钢铁集团日照有限公司 | Control method for automatically adjusting cleaning effect of continuous hot-dip galvanizing production line |
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| CN102011131A (en) * | 2010-07-27 | 2011-04-13 | 方明钢业(漳州)有限公司 | Sewage zero-emission metal strip surface cleaning device and method |
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| JP3603928B2 (en) * | 1998-03-20 | 2004-12-22 | 住友金属工業株式会社 | Method and apparatus for cleaning cold rolled steel strip in continuous annealing equipment |
| US6524391B2 (en) * | 2001-03-30 | 2003-02-25 | Alcan International Limited | Method for automatically controlling a chemical cleaning stage of a metal strip cleaning line |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2873342Y (en) * | 2005-07-29 | 2007-02-28 | 宝山钢铁股份有限公司 | Strip steel cleaner |
| CN201757847U (en) * | 2010-06-25 | 2011-03-09 | 鞍钢股份有限公司 | Cleaning control device for continuous annealing strip steel |
| CN201785499U (en) * | 2010-07-27 | 2011-04-06 | 方明钢业(漳州)有限公司 | Sewage zero-discharge surface cleaning device for metal strips |
| CN102011131A (en) * | 2010-07-27 | 2011-04-13 | 方明钢业(漳州)有限公司 | Sewage zero-emission metal strip surface cleaning device and method |
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Application publication date: 20121010 Assignee: BEIJING SHOUGANG COLD ROLLING THIN PLATE CO., LTD. Assignor: Capital Iron & Steel General Company Contract record no.: 2015990001019 Denomination of invention: Use method of cleaning section alkali liquor on continuous annealing production line Granted publication date: 20150225 License type: Common License Record date: 20151209 |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
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