CN105154634A - Cover-type annealing furnace hydrogen use amount saving method - Google Patents
Cover-type annealing furnace hydrogen use amount saving method Download PDFInfo
- Publication number
- CN105154634A CN105154634A CN201510257482.3A CN201510257482A CN105154634A CN 105154634 A CN105154634 A CN 105154634A CN 201510257482 A CN201510257482 A CN 201510257482A CN 105154634 A CN105154634 A CN 105154634A
- Authority
- CN
- China
- Prior art keywords
- hydrogen
- section
- stage
- purging
- hydrogen purge
- 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.)
- Pending
Links
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to the technical field of cold rolling and heat treatment and discloses a cover-type annealing furnace hydrogen use amount saving method. A heating insulation stage of an annealing process is divided into three time phases, the three time phases comprises a first hydrogen purging stage, a second hydrogen purging stage and a third hydrogen purging stage in a time order, a cooling stage comprises a cooling hydrogen purging stage, a first-stage hydrogen purging flow is 27-29m<3>/h, first-stage purging time is in a range of 4.5-6h, a second-stage hydrogen purging flow is 8-10m<3>/h, second-stage purging time is in a range of 10-12h, a third-stage hydrogen purging flow is 4-6m<3>/h, third-stage purging time is in a range of 4-6h, a cooling hydrogen purging flow is 2-2.5m<3>/h and cooling-stage hydrogen purging time is in a range of 18-21h. The method finishes steel coil annealing by the minimum hydrogen purging flow so that the optimal balance of hydrogen use amount, quality and safety is realized. The method satisfies product quality, realizes equipment stable operation and reduces hydrogen purging flow.
Description
Technical field
The cold rolling thermal treatment process field of the present invention is particularly a kind of method of saving bell type annealing furnace hydrogen usage.
Background technology
Existing cold rolling Heat treating machine set, many German Luo Yi companies of employing introduce HUGF220-520HPH type full-hydrogen hood-type annealing furnace.In heating, insulation and process of cooling, annealing furnace utilizes hydrogen purge belt steel surface to remain thing, and improves heat transmission, carries out recrystallize clean annealing to the coil of strip after cold rolling.Because hydrogen unit price constantly raises, and constantly increase by annealing device Continuous Running Equipment failure rate for many years, the impact of spare parts critical shortage, ton steel hydrogen consumption is increasing, causes unit process cost to continue to rise.For improving the market competitiveness of cold-rolled products, determining the method by adjustment hydrogen purge system, reducing annealing operation ton steel hydrogen consumption.
Hydrogen along with annealing process temperature control process all the time, sets different hydrogen purge sections and corresponding hydrogen purge flow respectively when heating, being incubated and cooling, to meet the product surface smooth finish that user requires.The annealing process of DC01 product (accounting for annealing output 91.6%) and hydrogen purge section situation, as shown in Figure 1.For annealing process and hydrogen purge section schematic diagram, as seen from Figure 1, hydrogen purge section is divided into four sections, wherein the heating of annealing process and the corresponding hydrogen purge 1 section to 3 sections of insulating process, the cooling section of the corresponding hydrogen purge of process of cooling.The hydrogen purge system of annealing process continues to use her technology of German Lip river always.
Because the coil of strip after some factory's rollings is without cleaning by degreasing process, it is more that belt steel surface remains thing, and smooth finish is poor.The product surface reflectivity that her annealing process system of former German Lip river obtains, cannot meet the requirement that user is more and more higher to product surface smooth finish, and hydrogen usage quantity is too high, annealing operation cost is seriously overspend.Therefore, need the annealing process system that exploitation is more excellent, while raising product surface reflectivity, reduce process cost, reduce useless hydrogen discharge.
The shortcoming of prior art is mainly manifested in following 3 points:
1) in annealing process, hydrogen usage quantity is large, show purging 2 sections, 3 sections, the hydrogen usage of cooling section is high, is the major cause that annealing operation cost is high;
2) after annealing, band steel reflectivity is low, cannot reach the high-quality surface quality product that user requires;
3) because hydrogen usage quantity is large, high temperature hydrogen discharge of giving up is caused to enter air.
Summary of the invention
Technical problem to be solved by this invention is that providing a kind of reduces annealing operation cost, the rear method be with steel reflectivity, reduced the saving bell type annealing furnace hydrogen usage of hydrogen discharge of giving up of raising annealing.
The present invention realizes like this, a kind of method of saving bell type annealing furnace hydrogen usage, three time periods are divided within the heating and thermal insulation stage of annealing process, be respectively the 1st section, the 2nd section according to time order and function order and the 3rd section carry out hydrogen purge section, as cooling section hydrogen purge section in cooling stages, the 1st section of hydrogen purge flow is 27-29m
3/ h, the purging used time is 4.5-6 hour; 2nd section of hydrogen purge flow is 8-10m
3/ h, the purging used time is 10-12 hour; 3rd section of hydrogen purge flow is 4-6m
3/ h, purges used time 4-6 hour; Cooling section hydrogen purge section, hydrogen purge flow is 2-2.5m
3/ h, purges used time 18-21 hour.
Further preferably, the 1st section of hydrogen purge flow is 28m
3/ h, purging the used time is 5 hours; 2nd section of hydrogen purge flow is 9m
3/ h, purging the used time is 11 hours; 3rd section of hydrogen purge flow is 5m
3/ h, purges 5 hours used times; Cooling section hydrogen purge section, hydrogen purge flow is 2m
3/ h, purges 20 hours used times.
Further, described 1st section for ROLLING OIL volatilization in 450 ~ 540 DEG C of temperature ranges.
Compared with prior art, beneficial effect is in the present invention: the present invention remains and volatilization feature and annealing device state in conjunction with annealing process theoretical characteristics, ROLLING OIL, is distributed in different sections and adopts different hydrogen purge consumptions.Follow the tracks of belt steel surface reflectivity, function qualification rate and the equipment failure rate under different hydrogen purging consumption, hydrogen purge amount is constantly adjusted, utilizes minimum hydrogen purge flow to complete coil annealing, reach hydrogen usage and quality, safe optimal balance point.Under the prerequisite meeting quality product and equipment steady running, reduce hydrogen purge flow, form new annealing process system, replace her hydrogen purge technique of former German Lip river, after being loaded into computer, in annealing process, automatically perform new hydrogen purge flow, solve the problem that in annealing process, ton steel hydrogen gas consumption is large.
Accompanying drawing explanation
Fig. 1 is annealing process and hydrogen purge section schematic diagram;
Fig. 2 is the reflectivity contrast of the 3rd section of different hydro flow;
Fig. 3 is the reflectivity contrast of the 2nd section of different hydro flow;
Fig. 4 is that the embodiment of the present invention and single stove hydrogen usage of the prior art contrast.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
A kind of method of saving bell type annealing furnace hydrogen usage of the present invention, three time periods are divided within the heating and thermal insulation stage of annealing process, be respectively the 1st section, the 2nd section according to time order and function order and the 3rd section carry out hydrogen purge section, as cooling section hydrogen purge section in cooling stages, the 1st section of hydrogen purge flow is 27-29m
3/ h, the purging used time is 4.5-6 hour; 2nd section of hydrogen purge flow is 8-10m
3/ h, the purging used time is 10-12 hour; 3rd section of hydrogen purge flow is 4-6m
3/ h, purges used time 4-6 hour; Cooling section hydrogen purge section, hydrogen purge flow is 2-2.5m
3/ h, purges used time 18-21 hour.
In preferred embodiment, the 1st section of hydrogen purge flow is 28m
3/ h, purging the used time is 5 hours; 2nd section of hydrogen purge flow is 9m
3/ h, purging the used time is 11 hours; 3rd section of hydrogen purge flow is 5m
3/ h, purges 5 hours used times; Cooling section hydrogen purge section, hydrogen purge flow is 2m
3/ h, purges 20 hours used times.
The explanation that above-mentioned method is undertaken testing by a best embodiment:
(1) first, before annealing, belt steel surface reflectivity controls
For belt steel surface reflectivity before annealing, the reflectivity after namely cold rolling controls, and keeps current standard state, performs existing processing parameter index, do not make any adjustments, and could judge the improvement situation of the rear product surface reflectivity of hydrogen flowing quantity reconstruction like this.The control situation of existing every rolling technological parameter index is as follows.
1) milling train No.1, No.2 working roll uses chrome-plated roller, chromium coating thickness 0.010 ~ 0.012mm;
2) milling train No.4 working roll roughness 2.8 ~ 3.5 μm;
3) emulsion A systemic concentration 2 ~ 5%;
4) emulsion hetero oil content≤15%;
5) milling train No.4 exports and purges pressure >=0.6MPa.
(2) ensureing to adjust each section of hydrogen flowing quantity under the prerequisite that hydrogen purge total amount is constant, reflectivity is improved
Consider and ensure and progressively improve existing belt steel surface reflectivity, first annealing hydrogen purge total amount is not adjusted, according to the evaporation curve of cold rolling oil, redistribute each section of hydrogen purge flow, adopt large discharge hydrogen purge in the optimal state 450 ~ 540 DEG C (1 section) of ROLLING OIL volatilization, each section of hydrogen purge technique is in table 1.
The hydrogen purge technique that table 1 ROLLING OIL is efficiently volatilized
After adopting the hydrogen purge process system of table 1, band steel reflectivity is provided to 85% by 78%.
(3) rebuild hydrogen flowing quantity, reduce hydrogen purge amount and quantity discharged
Testing program: the surface quality considering the stability of annealing process, security and annealing product, determines that process of the test is carried out from back to front by hydrogen purge section, is namely undertaken by first cooling section, then the 3rd section, the order of last 2nd section.
Cooling section blows hydrogen process stipulation: blowing hydrogen flowrate is 3m
3/ h, the time is 20h, and in process of cooling, furnace pressure is stablized.
Process of the test: choose 6 tables and test in 36 tables, each table adopts 3m respectively when cooling section blows hydrogen
3/ h and 2m
3/ h, identical cold section is blown hydrogen flowrate and respectively carries out 5 annealing tests, and observation is different blows pressure surge situation under hydrogen flowrate in annealing furnace.
Test-results: it is 2m that cooling section blows hydrogen flowrate
3/ h and 3m
3during/h, 60 stoves of test amount in 6270.2t product, and the average value difference of different hydro flow same table internal pressure is 0 ~ 0.1mbar.Cooling section hydrogen flowrate reduces 1m
3during/h, furnace pressure, without considerable change, reaches more than the 40mbar of design requirements.
According to the test-results of the 3rd section and cooling section being blown to hydrogen, promote novel process and do further checking on all 36 tables.Through the tracking of month, after annealing, every quality index of product was all within the span of control required, and meets the requirement of equipment steady running.
(4) the 3rd sections are blown hydrogen
Process of the test: random selecting 5 tables are as experiment table in 36 tables, and each table sets the 3rd section respectively in 15 annealing cycles to blow hydrogen flowrate be 10m
3/ h, 7m
3/ h and 5m
3/ h, namely same 3 sections are blown hydrogen flowrate and carry out 5 annealing tests.Follow the tracks of belt steel surface after coming out of the stove and whether there is oxidation tint defect, and sampling analysis is carried out to the reflectivity of coil of strip, see Fig. 2.
As seen from Figure 2,75 stoves of annealing test amount to 7837.5 tons of products, and the 3rd section is blown hydrogen flowrate and be respectively 10m
3/ h, 7m
3/ h, 5m
3during/h, corresponding average reflectance is 85.9%, 85.7%, 85.8%, and difference is 0.1 ~ 0.2%, and coil of strip surface cleaning is without considerable change, and reflectivity all reaches more than 84% of regulation, non-oxidation look defect.Therefore, the 3rd section of hydrogen flowrate reduces to 5m
3/ h on product surface quality without impact.
(5) the 2nd sections are blown hydrogen system
The evaporation curve of the DC01 product provided according to ROLLING OIL producer in conjunction with annealing process analysis, the 2nd section to blow the volatilization impact that hydrogen amount remains thing to belt steel surface less,
Process of the test: random selecting 5 stove is tested in 36 tables, each table sets the 2nd section respectively in 15 annealing cycles to blow hydrogen flowrate be 19m
3/ h, 14m
3/ h and 9m
3/ h, each 2 sections are blown hydrogen flowrate and carry out 5 annealing tests respectively.After coming out of the stove, whether the mechanical property of track band steel has significant change, and carries out sampling analysis to the reflectivity of belt steel surface, sees Fig. 3.
Experimental result 1: as seen from Figure 3,75 stoves of annealing test amount to 7796.8 tons of DC01 products, and the hydrogen flowrate that blows of the 2nd section is respectively 19m
3/ h, 14m
3/ h, 9m
3during/h, corresponding average reflectance is followed successively by 85.74%, 85.76%, 85.54%, and difference is 0.2%, and coil of strip surface cleaning is without considerable change, and reflectivity all reaches more than 84% of regulation.
Experimental result 2: the 2 sections blows hydrogen flowrate 19m
3/ h, 14m
3/ h and 9m
3a function qualification rate corresponding to/h is respectively 96.1%, 95.8% and 96.5%, all reaches more than 95% of regulation.Therefore, the 2nd section is blown hydrogen flowrate and reduces to 9m
3during/h, product mechanical property is unchanged.
According to the test-results of the 2nd section being blown to hydrogen institution adjustment, promote and on 36 tables, produce DC01 product do further checking.Through the tracking of half a year, after annealing, every quality index of product is all within the span of control required.
The inventive method saves amounts of hydrogen:
The each section of hydrogen purge saves amounts of hydrogen:
1) every stove cooling section saves amounts of hydrogen=(3-2) m
3/ h × 20h=20m
3;
2) amounts of hydrogen=(14-5) m saved by every the 3rd section, stove
3/ h × 5h=45m
3;
3) amounts of hydrogen=(19-9) m saved by every the 2nd section, stove
3/ h × 11h=110m
3;
4) every stove adds up to saving amounts of hydrogen=20m
3+ 45m
3+ 110m
3=175m
3;
Before and after improving, annealing cycle hydrogen usage quantity contrast, is shown in Fig. 4.
As seen from Figure 4, hydrogen purge system of the present invention is except the 1st section, and all the other each section of hydrogen flowing quantities are all lower than prior art, and hydrogen total flux reduces 36.6%.
Find through overtesting:
1) each annealing cycle saves hydrogen usage 175m
3.
2) product surface reflectivity brings up to 85% by 78%.
3) the useless hydrogen quantity discharged (calculating by 80%) of 400 DEG C decreases 140m
3.
4) cooling section hydrogen purge amount ensure that furnace pressure is stablized.
5) certain iron and steel corporation can save that hydrogen wound benefit is accumulative reaches 2,840 ten thousand yuan in 4 years.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. save the method for bell type annealing furnace hydrogen usage for one kind, it is characterized in that, three time periods are divided within the heating and thermal insulation stage of annealing process, be respectively the 1st section, the 2nd section according to time order and function order and the 3rd section carry out hydrogen purge section, as cooling section hydrogen purge section in cooling stages, the 1st section of hydrogen purge flow is 27-29m
3/ h, the purging used time is 4.5-6 hour; 2nd section of hydrogen purge flow is 8-10m
3/ h, the purging used time is 10-12 hour; 3rd section of hydrogen purge flow is 4-6m
3/ h, purges used time 4-6 hour; Cooling section hydrogen purge section, hydrogen purge flow is 2-2.5m
3/ h, purges used time 18-21 hour.
2., according to the method for saving bell type annealing furnace hydrogen usage according to claim 1, it is characterized in that,
1st section of hydrogen purge flow is 28m
3/ h, purging the used time is 5 hours; 2nd section of hydrogen purge flow is 9m
3/ h, purging the used time is 11 hours; 3rd section of hydrogen purge flow is 5m
3/ h, purges 5 hours used times; Cooling section hydrogen purge section, hydrogen purge flow is 2m
3/ h, purges 20 hours used times.
3., according to the method for saving bell type annealing furnace hydrogen usage according to claim 1, it is characterized in that, described 1st section for ROLLING OIL volatilization in 450 ~ 540 DEG C of temperature ranges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510257482.3A CN105154634A (en) | 2015-05-19 | 2015-05-19 | Cover-type annealing furnace hydrogen use amount saving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510257482.3A CN105154634A (en) | 2015-05-19 | 2015-05-19 | Cover-type annealing furnace hydrogen use amount saving method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105154634A true CN105154634A (en) | 2015-12-16 |
Family
ID=54795674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510257482.3A Pending CN105154634A (en) | 2015-05-19 | 2015-05-19 | Cover-type annealing furnace hydrogen use amount saving method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105154634A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111944960A (en) * | 2020-07-15 | 2020-11-17 | 涟源钢铁集团有限公司 | Method for reducing spheroidizing annealing decarburization of medium-high carbon steel in hot rolling |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828006A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | Annealing method of cold rolled silicon steel by intermittently reducing introduction of hydrogen |
| CN103276191A (en) * | 2013-06-06 | 2013-09-04 | 攀钢集团攀枝花钢钒有限公司 | Purge method for annealing of low-carbon cold-roll steel sheets |
| CN103305680A (en) * | 2013-06-08 | 2013-09-18 | 首钢总公司 | Method for producing cold-rolled sheet by means of cover annealing blowing |
-
2015
- 2015-05-19 CN CN201510257482.3A patent/CN105154634A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828006A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | Annealing method of cold rolled silicon steel by intermittently reducing introduction of hydrogen |
| CN103276191A (en) * | 2013-06-06 | 2013-09-04 | 攀钢集团攀枝花钢钒有限公司 | Purge method for annealing of low-carbon cold-roll steel sheets |
| CN103305680A (en) * | 2013-06-08 | 2013-09-18 | 首钢总公司 | Method for producing cold-rolled sheet by means of cover annealing blowing |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111944960A (en) * | 2020-07-15 | 2020-11-17 | 涟源钢铁集团有限公司 | Method for reducing spheroidizing annealing decarburization of medium-high carbon steel in hot rolling |
| CN111944960B (en) * | 2020-07-15 | 2022-03-08 | 涟源钢铁集团有限公司 | Method for reducing spheroidizing annealing decarburization of medium-high carbon steel in hot rolling |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Lu et al. | An energy apportionment model for a reheating furnace in a hot rolling mill–A case study | |
| Rojas-Cardenas et al. | Energy efficiency in the Mexican iron and steel industry from an international perspective | |
| CN102896161B (en) | A kind of minimizing technology of boracic cold-rolled steel hot rolling iron scale | |
| CN102755992B (en) | A kind of flux-cored wire cold-rolled strip production method | |
| CN102115809A (en) | Environment-friendly heat treatment process for large shaft forgings | |
| Brandt et al. | Ownership and productivity in vertically integrated firms: evidence from the Chinese steel industry | |
| Juntueng et al. | Energy and carbon dioxide intensity of Thailand's steel industry and greenhouse gas emission projection toward the year 2050 | |
| CN103173681B (en) | Cold rolled steel working roll using SKD-11 steel and production process thereof | |
| Hasanbeigi | Assessment of energy efficiency improvement and CO2 emission reduction potentials in the iron and steel industry in China | |
| Chen et al. | Fluctuation characteristic of billet region gas consumption in reheating furnace based on energy apportionment model | |
| CN105154634A (en) | Cover-type annealing furnace hydrogen use amount saving method | |
| CN205024290U (en) | Continuous annealing furnace overaging section belted steel cooling device | |
| Gołdasz et al. | Technical, economic, and environmental analyses of the modernization of a chamber furnace operating on natural gas or hydrogen | |
| Chen et al. | Hierarchical model to find the path reducing CO2 emissions of integrated iron and steel production | |
| Zhou et al. | Production and development of large blast furnaces from 2011 to 2014 in China | |
| He et al. | Time to change the energy conservation direction of China’s steel industry: From upgrading the technology level to increasing scrap ratio | |
| Na et al. | Evaluation and Improvement of Energy Utilization Efficiency in Typical Iron and Steel Smelting Route Based on Input‐Use‐End Model | |
| Liu et al. | Co-abatement of carbon and air pollutants emissions in China’s iron and steel industry under carbon neutrality scenarios | |
| Ren et al. | Analysis of existing problems and carbon emission reduction in Shandong's iron and steel industry | |
| CN114686769B (en) | Low-cost cold-rolled steel strip for electricians and manufacturing method thereof | |
| CN102876881A (en) | Method for shortening soaking time of straight carbon steel in heating furnace | |
| CN103074544B (en) | Cr-Mo-RE low-alloy seamless steel pipe for high-pressure boiler and manufacturing method of pipe | |
| CN202450114U (en) | Intelligent stainless steel smelting system | |
| CN109332418A (en) | For improve 300 be stainless steel BA plate surface grade technique | |
| Lu et al. | A novelty data mining approach for multi-influence factors on billet gas consumption in reheating furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151216 |
|
| RJ01 | Rejection of invention patent application after publication |