CN103353776B - Method for controlling acid liquid temperature in pickling in acid rolling mill set - Google Patents
Method for controlling acid liquid temperature in pickling in acid rolling mill set Download PDFInfo
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- CN103353776B CN103353776B CN201310236217.8A CN201310236217A CN103353776B CN 103353776 B CN103353776 B CN 103353776B CN 201310236217 A CN201310236217 A CN 201310236217A CN 103353776 B CN103353776 B CN 103353776B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
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Abstract
The invention relates to a method for controlling acid liquid temperature in pickling in an acid rolling mill set. The technical scheme is realized as follows: the pickling temperature control adopts a three-level picking stepped control, a first-level pickling temperature is 85 +/- 3 DEG C, a second-level pickling temperature is 82 +/- 3 DEG C and a third-level pickling temperature is 79 +/- 3 DEG C; the acid liquid is indirectly heated by using a block-aperture type graphite heat exchanger and the feeding opening amount of the quantity of steam is continuously regulated by a regulating valve; at the first-level pickling temperature at the beginning of the pickling, a surface temperature of a strip steel is relatively low, and the first-level pickling temperature can be set to be 85 +/- 3 DEG C; and after the temperature of the strip steel being gradually increased, the pickling temperature is set to be under gradient control, wherein the second-level pickling temperature is set to be 82 +/- 3 DEG C and the third-level pickling temperature 79 +/- 3 DEG C. According to the method, through the adoption of three-level pickling stepped control, an opening amount control curve of the regulating valve is modified, damage caused by direct impact on the block-aperture type graphite heat exchanger by saturated steam is prevented, the pickling quality is substantially improved, stable running of the pickling is guaranteed, and quality improvement and efficiency improvement are achieved.
Description
Technical field
The present invention relates to a kind of sour rolling mill pickling acid liquid temp control method, belong to cold-rolling pickling technical field.
Background technology
Along with China's rapid development of economy, the demand for iron and steel sheet and plate increases day by day, and hot rolled plate, before deep processing, must remove iron scale.When carrying out coating, the surface requiring steel plate to clean is to realize the adhesion of intermetallic alloying or guarantee coating.Pickling is cold rolling first treatment process, and its Main Function is to remove the iron oxide cortex sticking to steel surface, for following process is ready, and prevents from acid cleaning process, occur new defect.2180mm sour rolling mill pickling line conventional at present adopts shallow slot turbulence acid dip technology mostly, and in acid cleaning process, pickling temperature controls to adopt three-stage constant temperature (70-90 DEG C) to control.Acid liquor temperature controls, the first step, temperature setting stages, the graphite heat exchanger of three grades of pickling is arranged on the outlet of acid circulating pump, and the monitoring of acid liquor temperature is arranged on the outlet of graphite heat exchanger, in time working, manually give setting value or give setting value from level two, compare between the actual acid liquor temperature that records and setting value, when temperature is opened lower than variable valve during setting value XT, acid solution is heated; When temperature is closed, until temperature is close to setting value higher than variable valve during setting value XT.Second step, the acid solution heating period, acid solution heating relies on block hole-type graphite heat exchanger indirect heating.The medium adopted in heat interchanger is saturated vapour, feeds aperture by the continuous steam regulation amount of variable valve, adopts single closed-loop control, by thermal resistance on-line monitoring, and monitor value is shown to HMI and uses PID control theory to control.The height of acid liquor temperature is directly controlled by control valve opening.The initial control procedure curve of operation valve is shown in accompanying drawing 1.3rd step, the unloading phase of operation valve, first start acid circulating pump and keep being about 120s(pump working time in full-speed operation), control afterwards to start working, aperture within the X time is regulated to become 60% after pump running 2min, after valve opening becomes 60%, keep 2min, the aperture of valve becomes 100% after the X time, and the aperture of maintaining valve keeps 100% until acid liquor temperature is heated to setting value.4th step, operation valve dwell period, first closes variable valve, acid circulating pump full speed running 3-5min, ensures that heat interchanger is in a suitable temperature, avoids the improper damage of heat interchanger.
Acid liquor temperature control procedure by analysis, the pickling quality of acid cleaning process three-stage constant temperature on strip of background technology has larger impact, easily there is overpickling phenomenon, through statistics, use background technology, the product 134 tons that every monthly average is demoted because of pickling quality, the too high heat interchanger that easily causes of temperature damages in addition, simultaneously larger to burnup; Although operation valve control procedure can avoid the improper damage of heat interchanger to a certain extent, but, in the winter time, on-site environment temperature is about 15 DEG C, the general periodical repair time, stop for a long time and cause acid liquor temperature, heat interchanger and line temperature close to 15 DEG C, the saturated vapour pipeline around heat interchanger was the stainless steel pipe of DN80 between 8-16h, saturated vapour temperature about 170 DEG C, pressure is 0.7bar.When background technology production line opens car production, initial adjustment valve opening in 2min in remain unchanged, after the of short duration X time, the aperture of variable valve becomes 60%, but now the temperature of acid solution is substantially the same with the temperature of heat interchanger, after 2min, valve leaves and becomes 100% again, the aperture of variable valve becomes 100% from 0 within short 5min, the one-sided temperature of graphite block is elevated to 170 DEG C by 15 DEG C in a short period of time, and opposite side temperature does not have too large change substantially, the steam impringement heat interchanger easily causing pickling heating process to occur causes damaging, and then when heat interchanger is subject to serious thermal shock, causing expands with heat and contract with cold causes graphite block to break, acid solution is revealed, corrosion is pipeline and valve element around.Such as: certain cold rolling mill 2180mm sour rolling mill pickling line damaged heat interchanger 4 in short one year, and drain valve, non-return valve, filtrator, stop valve 4, cause heavy economic losses; After heat interchanger damages, condensate water conductivity value is high, causes condensate water to be directly discharged in cesspit, causes rinsing section condensation water quantity deficiency to affect wash effect; After heat interchanger damages, acid liquor temperature cannot ensure, causes pickling time longer, and affects strip quality, had a strong impact on the travelling speed of production line, caused heavy economic losses.
Summary of the invention
The object of the invention is to provide a kind of sour rolling mill pickling acid liquid temp control method, adopt three grades of pickling Stepped controls, have modified the aperture controlling curve of variable valve, avoid the impact of the direct heat exchanger of saturated vapour and the heat interchanger that causes damages, solve the problems referred to above existed in background technology.
The technical scheme of invention is: a kind of sour rolling mill pickling acid liquid temp control method, and pickling temperature controls employing three grades of pickling Stepped controls, and one-level pickling temperature is 85 ± 3 DEG C, and secondary pickling temperature is 82 ± 3 DEG C, and three grades of pickling temperatures are 79 ± 3 DEG C; Acid solution heating adopts block hole-type graphite heat exchanger indirect heating, feeds aperture by the continuous steam regulation amount of variable valve; In the one-level pickling temperature that pickling starts, belt steel surface temperature is lower, and in acid cleaning process, the heat interchange of acid solution and band steel is than very fast, and the setting of one-level pickling temperature is higher is 85 ± 3 DEG C; After belt steel temperature promotes gradually, pickling temperature is set to that gradient controls: secondary pickling temperature is 82 ± 3 DEG C, and three grades of pickling temperatures are 79 ± 3 DEG C.
Embodiment comprises following steps more specifically:
The first step, temperature setting stages, the monitoring device of acid liquor temperature is arranged on the outlet of block hole-type graphite heat exchanger, in time working, manually gives setting value or gives setting value from level two, one-level pickling temperature is set as 82-88 DEG C, preferably 85 DEG C, secondary pickling temperature is set as 79-85 DEG C, preferably 82 DEG C, three grades of pickling temperatures are set as 76-82 DEG C, preferably 79 DEG C; Compare between actual for the monitoring device acid liquor temperature that records and setting value, when acid liquor temperature is lower than setting value, variable valve is opened, and heats acid solution, until acid liquor temperature equals setting value; When acid liquor temperature is higher than setting value, variable valve cuts out, until acid liquor temperature equals setting value;
Second step, the acid solution heating period, acid solution heating relies on block hole-type graphite heat exchanger indirect heating, feeds aperture by the continuous steam regulation amount of variable valve; The height of acid liquor temperature is directly controlled by control valve opening;
3rd step, the unloading phase of variable valve, the unloading phase of variable valve, three grades of acid solution variable valve initially avoid steam to be directly 0.9-1.1min to the retention time of the impact of block hole-type graphite heat exchanger, and after the of short duration X time, 20-25% opened by variable valve, through the preheating of 10-12min, variable valve is opened to 60-65%, and heat interchanger rises gradually to acid solution thermal-stable, then after 6-7min, variable valve is opened to 100% completely, and the aperture of maintaining valve keeps 100% until acid liquor temperature is heated to setting value; Realize comprehensive acid solution heat exchange, ensure that pickling is normally carried out; In order to ensure the abundant heating of acid solution, and avoid heat interchanger to cause the graphite block of block hole-type graphite heat exchanger to break due to thermal shock, the control valve opening controlling curve for background technology adjusts; Three grades of acid solution variable valve initially avoid steam to be directly reduced to 0.9-1.1min to the retention time of the impact of block hole-type graphite heat exchanger by 2min, after the of short duration X time, 20-25% opened by variable valve, through the preheating of 10-12min, variable valve is opened to 60-65%, heat interchanger rises gradually to acid solution thermal-stable, again after 6-7min, variable valve is opened to 100% completely, and the aperture of maintaining valve keeps 100% until acid liquor temperature is heated to setting value; Realize comprehensive acid solution heat exchange, ensure that pickling is normally carried out; The described of short duration X time is control valve opening transformation period, is 2-5s;
4th step, variable valve dwell period, first closes variable valve, and acid circulating pump is full speed running 3-5min again, ensures the temperature of block hole-type graphite heat exchanger, avoids the improper damage of block hole-type graphite heat exchanger.
Described temperature setting stages, one-level pickling temperature is set as 85 DEG C, and secondary pickling temperature is set as 82 DEG C, and three grades of pickling temperatures are set as 79 DEG C.
The present invention has the following advantages: by adopting three grades of pickling Stepped controls, the aperture controlling curve of amendment variable valve, avoid saturated vapour directly to the impact of block hole-type graphite heat exchanger and the damage caused, pickling quality is enhanced, pickling defect is from the original moon 134 tons, be reduced to the moon less than 30 tons, reduce nearly 80%; The damage of block hole-type graphite heat exchanger is from heat interchanger 4 original a year, and drain valve, non-return valve, filtrator, stop valve 4, change 1 heat interchanger in 1 year up till now, failure rate reduces 75%, ensure that the stable operation of pickling, reaches upgrading synergy.
Accompanying drawing explanation
Fig. 1 is background technology variable valve operation curve;
Fig. 2 is background technology variable valve operation curve of the present invention.
Embodiment
The present invention will be further described by the following examples.
Embodiment one: 2180mm sour rolling mill pickling line, temperature setting stages, manually give setting value or give setting value from level two, one-level pickling temperature is set as 82 DEG C, and secondary pickling temperature is set as 79 DEG C, and three grades of pickling temperatures are set as 76 DEG C.The height of acid liquor temperature is directly controlled by control valve opening.The unloading phase of variable valve, in order to ensure the abundant heating of acid solution, and avoid block hole-type graphite heat exchanger to cause breaking of graphite block due to thermal shock, the control valve opening controlling curve for background technology adjusts.Three grades of acid solution variable valve initially avoid steam to be directly reduced to 0.9min to the retention time of the impact of block hole-type graphite heat exchanger by 2min, after the of short duration X time, variable valve opens 20%, through the preheating of 10min, variable valve is opened to 60%, block hole-type graphite heat exchanger rises gradually to acid solution thermal-stable, again after 6min, variable valve is opened to 100% completely, and the aperture of maintaining valve keeps 100% until acid liquor temperature is heated to setting value.Realize comprehensive acid solution heat exchange, ensure that pickling is normally carried out.Variable valve dwell period, first closes variable valve, acid circulating pump full speed running 3min, and guarantee block hole-type graphite heat exchanger is in a suitable temperature, avoids the improper damage of block hole-type graphite heat exchanger.After measuring pickling, strip surface clearness (reflectivity) reaches 86%.
Embodiment two: 2180mm sour rolling mill pickling line, temperature setting stages, manually give setting value or give setting value from level two, one-level pickling temperature is set as 85 DEG C, and secondary pickling temperature is set as 82 DEG C, and three grades of pickling temperatures are set as 79 DEG C.The height of acid liquor temperature is directly controlled by control valve opening.The unloading phase of variable valve, in order to ensure the abundant heating of acid solution, and avoiding block hole-type graphite heat exchanger to cause breaking of graphite block due to thermal shock, adjusting for the control valve opening controlling curve in background technology.Three grades of acid solution variable valve initially avoid the retention time of the impact of the direct heat exchanger of steam to be reduced to 1min by 2min, after the of short duration X time, variable valve opens 22.5%, through the preheating of 11min, variable valve is opened to 62.5%, block hole-type graphite heat exchanger rises gradually to acid solution thermal-stable, again after 6.5min, variable valve is opened to 100% completely, and the aperture of maintaining valve keeps 100% until acid liquor temperature is heated to setting value.Realize comprehensive acid solution heat exchange, ensure that pickling is normally carried out.Variable valve dwell period, first closes variable valve, acid circulating pump full speed running 4min, and guarantee block hole-type graphite heat exchanger is in a suitable temperature, avoids the improper damage of block hole-type graphite heat exchanger.After measuring pickling, strip surface clearness (reflectivity) reaches 88%.
Embodiment three: 2180mm sour rolling mill pickling line, temperature setting stages, manually give setting value or give setting value from level two, one-level pickling temperature is set as 88 DEG C, and secondary pickling temperature is set as 85 DEG C, and three grades of pickling temperatures are set as 82 DEG C.The height of acid liquor temperature is directly controlled by control valve opening.The unloading phase of variable valve, in order to ensure the abundant heating of acid solution, and avoid block hole-type graphite heat exchanger to cause breaking of graphite block due to thermal shock, the control valve opening controlling curve for background technology adjusts.Three grades of acid solution variable valve initially avoid the retention time of the impact of the direct heat exchanger of steam to be reduced to 1.1min by 2min, after the of short duration X time, variable valve opens 25%, through the preheating of 12min, variable valve is opened to 65%, block hole-type graphite heat exchanger rises gradually to acid solution thermal-stable, again after 7min, variable valve is opened to 100% completely, and the aperture of maintaining valve keeps 100% until acid liquor temperature is heated to setting value.Realize comprehensive acid solution heat exchange, ensure that pickling is normally carried out.Variable valve dwell period, first closes variable valve, acid circulating pump full speed running 5min, and guarantee block hole-type graphite heat exchanger is in a suitable temperature, avoids the improper damage of block hole-type graphite heat exchanger.After measuring pickling, strip surface clearness (reflectivity) reaches 84%.
After the invention process, effectively can ensure that pickling temperature controls stable, avoid the frequent breakage of acid solution firing equipment, strip surface reflectivity all reaches more than 80%, there is very large effect to cold-rolled products quality and steady production, preferably resolve the bottleneck problem of rhythm of production instability.
Claims (2)
1. a sour rolling mill pickling acid liquid temp control method, is characterized in that: pickling temperature controls employing three grades of pickling Stepped controls, and one-level pickling temperature is 85 ± 3 DEG C, and secondary pickling temperature is 82 ± 3 DEG C, and three grades of pickling temperatures are 79 ± 3 DEG C; Acid solution heating adopts block hole-type graphite heat exchanger indirect heating, feeds aperture by the continuous steam regulation amount of variable valve; In the one-level pickling temperature that pickling starts, belt steel surface temperature is lower, and the setting of one-level pickling temperature is higher is 85 ± 3 DEG C; After belt steel temperature promotes gradually, pickling temperature is set to that gradient controls: secondary pickling temperature is 82 ± 3 DEG C, and three grades of pickling temperatures are 79 ± 3 DEG C;
Concrete steps are:
The first step, temperature setting stages, the monitoring device of acid liquor temperature is arranged on the outlet of block hole-type graphite heat exchanger, manually give setting value or give setting value from level two, one-level pickling temperature is set as 82-88 DEG C, secondary pickling temperature is set as 79-85 DEG C, and three grades of pickling temperatures are set as 76-82 DEG C; Compare between actual for the monitoring device acid liquor temperature that records and setting value, when acid liquor temperature is lower than setting value, variable valve is opened, and heats acid solution, until acid liquor temperature equals setting value; When acid liquor temperature is higher than setting value, variable valve cuts out, until acid liquor temperature equals setting value;
Second step, the acid solution heating period, acid solution heating relies on block hole-type graphite heat exchanger indirect heating, feeds aperture by the continuous steam regulation amount of variable valve; The height of acid liquor temperature is directly controlled by control valve opening;
3rd step, the unloading phase of variable valve, control valve opening controlling curve is adjusted, three grades of acid solution variable valve initially avoid steam to be directly 0.9-1.1min to the retention time of the impact of block hole-type graphite heat exchanger, after the of short duration X time, 20-25% opened by variable valve, through the preheating of 10-12min, variable valve is opened to 60-65%, heat interchanger rises gradually to acid solution thermal-stable, again after 6-7min, variable valve is opened to 100% completely, and the aperture of maintaining valve keeps 100% until acid liquor temperature is heated to setting value; The described of short duration X time is control valve opening transformation period, is 2-5s;
4th step, variable valve dwell period, first closes variable valve, and acid circulating pump is full speed running 3-5min again, ensures the temperature of block hole-type graphite heat exchanger.
2. a kind of sour rolling mill pickling acid liquid temp control method according to claim 1, it is characterized in that described temperature setting stages, one-level pickling temperature is set as 85 DEG C, and secondary pickling temperature is set as 82 DEG C, and three grades of pickling temperatures are set as 79 DEG C.
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| CN110486897A (en) * | 2019-08-07 | 2019-11-22 | 浙江中烟工业有限责任公司 | Air-conditioning heating valve optimal control method and system based on PID control |
| CN110825130A (en) * | 2019-10-31 | 2020-02-21 | 中冶陕压重工设备有限公司 | Acid liquor temperature control method for pickling line process section |
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Patent Citations (3)
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| CN102233364A (en) * | 2010-04-21 | 2011-11-09 | 宝山钢铁股份有限公司 | Martensite air valve steel bar production method |
| CN102899672A (en) * | 2012-09-12 | 2013-01-30 | 山西太钢不锈钢股份有限公司 | Continuous pickling method for super austenitic stainless steel coil |
| CN102877080A (en) * | 2012-09-26 | 2013-01-16 | 中冶南方工程技术有限公司 | Hot-rolled stainless steel strip steel mixed-acid pickling circulation system and method |
Non-Patent Citations (1)
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| 刘振杰 等.冷轧薄板酸洗表面缺陷分析及探讨.《2012年河北省轧钢技术暨学术年会论文集(下)》.2012, * |
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