CN106544471A - A kind of control method of KR methods desulfurization smelting process speed of agitator - Google Patents
A kind of control method of KR methods desulfurization smelting process speed of agitator Download PDFInfo
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- CN106544471A CN106544471A CN201610907571.2A CN201610907571A CN106544471A CN 106544471 A CN106544471 A CN 106544471A CN 201610907571 A CN201610907571 A CN 201610907571A CN 106544471 A CN106544471 A CN 106544471A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
A kind of control method of KR methods desulfurization smelting process speed of agitator, belongs to technical field of ferrous metallurgy, it is adaptable to KR molten iron pre-desulfurization process control technologies.The method can calculate each heat in the whole usage cycles of stirring-head and meet desulfurization needs and the Rational Rotation Speed that stably can be stirred.The method can be such that smelting stirring accelerator steadily carries out safely by formulating acceleration control parameter of the stirring-head in whole usage cycles.Advantage using the method is can to reduce smelting process and get rid of iron, current overload probability, mixing control process standardization in stirring-head whole usage cycles while the labour intensity of operative employee can be significantly reduced.
Description
Technical field
The invention discloses a kind of KR methods desulfurization smelting process speed of agitator control method, belongs to Ferrous Metallurgy technology neck
Domain, it is adaptable to KR molten iron pre-desulfurization process control technologies.
Background technology
KR doctor treatments are the Main Means of Liquid Iron Pretreatment Technology, and which passes through mechanical agitation makes molten iron and desulfurizing agent fully mix
Close, the dynamic conditions for improving sweetening process reaches the purpose of desulfurization rapidly.KR doctor treatments are because its equipment is stable, operate letter
Singly extensively applied by domestic and international iron and steel enterprise.
KR doctor treatments need for refractory material stirring-head to immerse molten iron certain depth, by the high speed Stirring of stirring-head
Molten iron is sufficiently mixed which with desulfurizing agent motion.Due to the erosion of washing away of molten iron in whipping process, the refractory material mill of stirring-head
Damage extremely serious.The generally service life of stirring-head fluctuation between 150-300 time according to the difference of working condition and manufacture level.
In a usage cycles, the ability of stirring-head stirring molten iron gradually can change, therefore adding up with access times, need not
Disconnected adjustment rotating speed is caused operative employee's working strength high and reduces the standardization smelted to ensure mixing effect, at the same easily because
Rotating speed is too fast to cause whipping process to get rid of iron and motor current overload.
In KR whipping process, stirring-head needs from static to start to accelerate to required speed of agitator, the acceleration of stirring-head
Process is generally not what is be done directly, needs to accelerate through multiple intermediate speeds substep so that the electric current that accelerator is caused rises
Carry out falling and avoid current overload.In the different operational phases of stirring-head, substep accelerates the tachometer value for accelerating every time and has accelerated
It is different into the rear required time for waiting electric current to fall after rise, it is therefore desirable to set respectively.
The content of the invention
The invention discloses a kind of control method of KR methods desulfurization smelting process speed of agitator, comprises the steps：
Step one：Before molten iron process starts, the access times n of this processing procedure stirring-head is obtained；
Step 2：The calculating parameter calculating benchmark rotational speed omega of reference rotation speed are selected according to the access times of stirring-head0；
Step 3：According to the access times selection operation pattern of stirring-head, each stage included in obtaining operator scheme turns
Fast amount of floating, the floating that each stage rotating speed is carried out to control by stages KR whipping process are calculated.
Step 4：Substep is obtained in the operator scheme chosen from step 3 and accelerates control parameter.
Step 5：After process starts, control parameter is obtained according to above-mentioned selection, calculating and completed substep acceleration, stirred stage by stage
Mix control process.When control occur and being abnormal, the setting value of rotating speed can be changed according to actual needs.
Step 6：This heat is smelted after finishing, and records this and smelts stirring-head access times, mean speed information, to turning
Fast calculating parameter is fitted again and is updated calculating parameter.
In said method, the reference rotation speed calculating parameter described in step 2 is selected as follows：1：When stirring-head
Access times are less than or equal to n0When secondary, first group of calculating parameter a1, b1, reference rotation speed computing formula ω are selected0=a1 × n+
b1.2：Remaining heat selects calculating parameter a2, b2, reference rotation speed computing formula ω0=a2 × n+b2.Wherein parameter n0For heat
Stirring-head access times when substantially slowing down occurs in the increase of average agitation rotating speed, between 6-15.A1, b1, a2, b2 parameter passes through
Fitting stirring-head access times and correspondence heat stirring mean speed are obtained.Different according to stirring-head characteristic, a1 is made with 0.5-1.5
For control range, using 80-90 as control range, using 0.2-0.3 as control range, b2 is using 85-95 as control model for a2 for b1
Enclose.
In said method, the operator scheme described in step 3 is set as follows：Operator scheme is made according to stirring
With number of times as the basis for setting.New stirring-head (access times are less than 30 times), using 6-10 time as a stir mode, after
Each stir mode may span across more access times, and such as 20,30,40.The all possible stirring-head of operator scheme correspondence is used
Number of times.Each operator scheme need to include rotating speed floating calculating parameter, accelerate control parameter information.
In said method, the floating of each stage rotating speed described in step 3 is calculated, the amount of floating Δ ω of each stage rotating speed1、
Δω2…ΔωiSet in operator scheme according to the different operational phases of stirring-head.Setting speed ω in stage 11=ω0+
Δω1, the setting speed in stage 2 is ω2=ω0+Δω2, the setting speed of stage i is ωi=ω0+Δωi.Amount of floating Δ
ω1、Δω2…ΔωiSetting range is chosen in the range of [- 10,10].Total agitation phases number i values are 4-6.
In said method, described in step 3, the choosing method of each stage rotating speed amount of floating is as follows：Stage 1,2 takes negative value, prevents
Starting stage rotating speed is smelted only too fast, stable furnace condition；Most latter two stage of smelting is taken on the occasion of raising speed of agitator.If stirring
Equipment has minimum, peak to limit to rotating speed, when calculated value exceedes minimum, peak scope, then takes minimum, peak for setting
Value.
In said method, the substep described in step 4 accelerates control parameter, joins including following three under each operator scheme
Number：Accelerate initial speed ωacc0, substep accelerate step-length ωacc, electric current fall after rise duration twait.Wherein ωacc0It is set to the stirring-head
The 50-70% of reference rotation speed under access times, with stir current nonoverload as principle.Substep accelerates step-length ωaccSetting value according to
The access times of stirring-head are chosen in the range of [4,15], and with after acceleration, current increase as overload current 10% or so is original
Then.Electric current falls duration t after risewaitFallen after rise to the stable time according to history heat electric current and determined, chosen between [3,10] (second).
In said method, the substep described in step 4 accelerates control parameter working method as follows：Stirring-head is by static or one
Determine rotating speed and accelerate to acceleration initial speed ω firstacc0.After the completion of acceleration, stable stir current falls duration t after risewait, backward turn
Speed is ωacc0+ωaccAccelerated.After the completion of acceleration, stable stir current falls duration t after risewait, method is until accelerate to according to this
1 setting speed of stage described in step 3.
In said method, the substep described in step 4 accelerates control parameter also to include following current control parameter Ialarm.Should
85%-90% of the choosing method of parameter for overload current, the mode of action of the parameter be when actual current is more than this parameter,
Acceleration operation is not carried out immediately but is stablized stir current again and is fallen duration t after risewaitUntil actual current is not more than this current control
Parameter.
In said method, be fitted to calculating parameter again described in step 6 is adopted with the following method：When this stirring
Head access times are n0When, with stirring-head access times as 1-n0For parameter x, with the corresponding average agitation rotating speed of access times it is
Y, goes out calculating parameter a1, b1 using least square fitting, and a1, b1 value after self study has one or exceedes control range
When, then a1, b1 are not updated, otherwise update a1, b1.
In said method, described in step 6 calculating parameter is fitted again also include parameter m is calculated as below：M's
Span is [30,40].When the access times of stirring-head are more than m, with stirring-head access times as n0- n be parameter x, with
The corresponding average agitation rotating speed of access times is y, goes out calculating parameter a2, b2 using least square fitting, after self study
When a2, b2 value has one or exceedes control range, then a2, b2 are not updated, otherwise update a2, b2.
Above-mentioned control method can be automatically performed by primary PLC system or level two.When this control method passes through
When primary PLC system or level two are automatically performed, it is possible to achieve the whipping process in the whole usage cycles of stirring-head
Automatically control, greatly reduce the labour intensity of operative employee, improve automatization level.
Description of the drawings
Fig. 1 is the control flow chart of speed of agitator of the present invention.
Specific embodiment
This method is described in further detail with reference to embodiment.
Set several basic initial parameters such as table one, stir mode parameter such as table two.
1 parameter setting of table
| a1 | b1 | a2 | b2 | n0 | m | Ialarm/A |
| 1 | 84 | 0.245 | 88 | 6 | 50 | 810 |
2 stir mode parameter of table
| Mode number | Applicable stirring-head access times | Δω1 | Δω2 | Δω3 | Δω4 | ωacc0 | ωacc | twait |
| 1 | [1,6] | -8 | -4 | 0 | 0 | 45 | 4 | 3 |
| 2 | (6,16] | -8 | -4 | 0 | 0 | 50 | 4 | 3 |
| 3 | (16,26] | -6 | -3 | 0 | 0 | 65 | 4 | 5 |
| 4 | (26,40] | -6 | -3 | 0 | 0 | 70 | 4 | 5 |
| 5 | (40,60] | -4 | -2 | 0 | 0 | 75 | 8 | 5 |
| 6 | (60,90] | -2 | 0 | 0 | 0 | 80 | 10 | 6 |
| 7 | (90,120] | 0 | 0 | 0 | 0 | 90 | 10 | 6 |
| 8 | (120,160] | 0 | 0 | 2 | 4 | 90 | 10 | 6 |
| 9 | (160,200] | 0 | 0 | 2 | 4 | 100 | 10 | 5 |
| 10 | (200,240] | 0 | 0 | 3 | 6 | 110 | 15 | 6 |
| 11 | (240,280] | 0 | 0 | 3 | 6 | 110 | 15 | 6 |
| 12 | (280,320] | 0 | 0 | 4 | 8 | 110 | 15 | 6 |
| 13 | (320,360] | 0 | 0 | 4 | 8 | 110 | 15 | 6 |
Referring to figure one, the present invention is applied to the control method of KR method desulfurization smelting process speeds of agitator, comprises the steps.
Step one：Before molten iron process starts, the access times n of this processing procedure stirring-head, such as n=6 or n=are obtained
140；
Step 2：The calculating parameter calculating benchmark rotational speed omega of reference rotation speed are selected according to the access times of stirring-head0.When
During n=6, ω0=1 × 6+84=90 (r/min)；As n=140, ω0=0.245 × 140+88=122 (r/min).
Step 3：According to the access times selection operation pattern of stirring-head, each stage included in obtaining operator scheme turns
Fast amount of floating, the floating that each stage rotating speed is carried out to control by stages KR whipping process are calculated.
Such as n=6, pattern 1, Δ ω are selected1=-8, Δ ω2=-4, Δ ω3=0, Δ ω4=0.ω1=90-8=
82 (r/min), ω2=90-4=84 (r/min), ω3=90+0=90 (r/min), ω4=90+0=90 (r/min).
As n=140, pattern 8, Δ ω are selected1=0, Δ ω2=0, Δ ω3=2, Δ ω4=4.ω1=122+0=
122 (r/min), ω2=122+0=122 (r/min), ω3=122+2=124 (r/min), ω4=122+4=126 (r/
min)。
Step 4：Substep is obtained in the operator scheme chosen from step 3 and accelerates control parameter.
Such as n=6, ωacc0=45 (r/min), ωacc=4 (r/min), twait=3s.
Such as n=140, ωacc0=90 (r/min), ωacc=10 (r/min), twait=6s.
Step 5：After process starts, control parameter is obtained according to above-mentioned selection, calculating and completed substep acceleration, stirred stage by stage
Mix control process.
Such as n=6, the control process of speed of agitator is as described below：Speed of agitator accelerates to 45r/min first, stable
Stirring 3s waits electric current to fall after rise, and such as now electric current increases to 45+4=49 (r/min) not less than 810A, then rotating speed.Method successively
Rotating speed increases to 82 (r/min), and the distribution accelerator of speed of agitator is completed.As the first stage (82 (r/ of stable stirring
Min, after the completion of)), second stage (84 (r/min)), phase III (90r/min), fourth stage (90r/min) are sequentially entered
Until stirring terminates.
As n=140, the control process of speed of agitator is as described below：Speed of agitator accelerates to 90r/min first, stable
Stirring 6s waits electric current to fall after rise, and such as now electric current increases to 90+10=100 (r/min) not less than 810A, then rotating speed.It is square successively
Method rotating speed increases to 110 (r/min), and the distribution accelerator of speed of agitator is completed.When first and second stage (122 of stable stirring
(r/min), after the completion of), phase III (124 (r/min)), fourth stage (126 (r/min)) are sequentially entered until stirring knot
Beam.
Step 6：This heat is smelted after finishing, and records this and smelts stirring-head access times, mean speed information, to turning
Fast calculating parameter is fitted again and is updated calculating parameter.
Smelt the following table is heat that stirring-head access times are the 94th time after finishing, the from the 7th to the 94th time of acquisition
Median needed for stirring-head access times, corresponding actual average rotating speed and calculating.
Fitting formula is：
The a2=93 of calculating, b2=0.214.A2, b2 are then updated to a2, b2 parameter in control range.Instantly
When one heat is calculated, calculating parameter chooses a2=93, b2=0.214.
Claims (10)
1. a kind of control method of KR methods desulfurization smelting process speed of agitator, it is characterised in that：
Step one：Before molten iron process starts, the access times n of this processing procedure stirring-head is obtained；
Step 2：Reference rotation speed calculating parameter calculating benchmark rotational speed omega are selected according to the access times n of stirring-head0；
Step 3：According to the access times selection operation pattern of stirring-head, each stage rotating speed included in obtaining operator scheme is floated
Momentum, the floating that each stage rotating speed is carried out to control by stages KR whipping process are calculated；
Step 4：Substep is obtained in the operator scheme chosen from step 3 and accelerates control parameter；
Step 5：After process starts, control parameter is obtained according to above-mentioned selection, calculating and completed substep acceleration, stirred stage by stage and control
Process processed；When control occur and being abnormal, the setting value of rotating speed can be changed according to actual needs；
Step 6：This heat is smelted after finishing, and records this and smelts stirring-head access times, mean speed information, to tachometer
Calculate parameter to be fitted again and update calculating parameter.
2. control method as claimed in claim 1, it is characterised in that：Described reference rotation speed calculating parameter system of selection：When
The access times of stirring-head are less than or equal to n0When secondary, first group of calculating parameter a1, b1, reference rotation speed computing formula ω are selected0=
a1×n+b1；Remaining heat selects calculating parameter a2, b2, reference rotation speed computing formula ω0=a2 × n+b2；
Wherein parameter n0For heat average agitation rotating speed increase occur substantially slow down when stirring-head access times, between 6-15；
Parameter a1, b1, a2, b2 parameter stir mean speed and obtain by being fitted stirring-head access times and correspondence heat.
3. control method as claimed in claim 2, it is characterised in that：Described n0Span is between 6-15；According to stirring
Head characteristic is different, and, using 0.5-1.5 as control range, described b1 is using 80-90 as control range, described a2 for described a1
Using 0.2-0.3 as control range, described b2 is using 85-95 as control range.
4. control method as claimed in claim 1, it is characterised in that：Described operator scheme is made according to the access times of stirring
For the basis of setting；
New stirring-head, using 6-10 time as a stir mode, each stir mode may span across one or more using secondary later
Number；The all possible stirring-head access times of operator scheme correspondence；Each operator scheme need to include rotating speed floating calculating parameter, add
Fast control parameter information.
5. control method as claimed in claim 4, it is characterised in that：It is each stage that the floating of described each stage rotating speed is calculated
The amount of floating of rotating speed, is designated as Δ ω1、Δω2…Δωi, set in operator scheme according to the different operational phases of stirring-head；
Setting speed ω in stage 11=ω0+Δω1, the setting speed in stage 2 is ω2=ω0+Δω2, the setting speed of stage i is
ωi=ω0+Δωi；Amount of floating Δ ω1、Δω2…ΔωiSetting range is chosen in the range of [- 10,10]；Total agitation phases
Number i values are 4-6.
6. control method as claimed in claim 5, it is characterised in that：The choosing method of described each stage rotating speed amount of floating is such as
Under：Stage 1,2 takes negative value, prevents smelting starting stage rotating speed too fast, stable furnace condition；Most latter two stage of smelting is taken on the occasion of carrying
High speed of agitator；If mixing plant has minimum, peak to limit to rotating speed, when calculated value exceedes minimum, peak scope, then
Minimum, peak is taken for setting value.
7. control method as claimed in claim 1, it is characterised in that：Described substep accelerates control parameter to include accelerating initially
Rotational speed omegaacc0, substep accelerate step-length ωacc, electric current fall after rise duration twait；Wherein ωacc0It is set under the stirring-head access times
The 50-70% of reference rotation speed, with stir current nonoverload as principle；Substep accelerates step-length ωaccSetting value making according to stirring-head
Chosen in the range of [4,15] with number of times, with after acceleration, current increase as overload current 10% or so is as principle；Electric current is returned
Fall duration twaitFallen after rise to the stable time according to history heat electric current and determined, choose between [3,10], electric current falls duration t after risewait
Unit is the second；
Substep accelerates control parameter working method as follows：Stirring-head accelerates to acceleration initial speed first by static or certain rotating speed
ωacc0；After the completion of acceleration, stable stir current falls duration t after risewait, backward rotating speed be ωacc0+ωaccAccelerated；Accelerate
After the completion of, stable stir current falls duration t after risewait, method is until accelerate to 1 setting speed of stage described in step 3 according to this.
8. control method as claimed in claim 7, it is characterised in that：Described substep accelerates control parameter also to include electric current control
Parameter I processedalarm；85%-90% of the choosing method of the parameter for overload current, the mode of action of the parameter is to work as actual current
During more than this parameter, acceleration operation is not carried out immediately but is stablized stir current again and is fallen duration t after risewaitUntil actual current is little
In this current control parameter.
9. control method as claimed in claim 1, it is characterised in that：Described is fitted to calculating parameter again using such as
Lower method：When this stirring-head access times is n0When, with stirring-head access times as 1-n0For parameter x, with access times correspondence
Average agitation rotating speed be y, calculating parameter a1, b1 is gone out using least square fitting, a1, b1 value after self study has one
Or during more than control range, then a1, b1 are not updated, otherwise update a1, b1.
10. control method as claimed in claim 9, it is characterised in that：Described being fitted to calculating parameter again is also wrapped
Include and parameter m is calculated as below：The span of m is [30,40]；When the access times of stirring-head are more than m, with stirring-head using secondary
Number is n0- n be parameter x, with the corresponding average agitation rotating speed of access times as y, calculating parameter is gone out using least square fitting
A2, b2, when a2, b2 value after self study has one or exceedes control range, are not then updated to a2, b2, otherwise more
New a2, b2.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107586913A (en) * | 2017-08-25 | 2018-01-16 | 宁波钢铁有限公司 | A kind of efficient stirring desulphurization method |
| CN108588318A (en) * | 2018-05-22 | 2018-09-28 | 武汉钢铁有限公司 | Molten iron mechanical agitation efficient low-consume sulfur method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102234703B (en) * | 2010-04-23 | 2013-03-20 | 宝山钢铁股份有限公司 | On-line thermal state cleaning method for accumulated burl on mechanical desulfuration stirring paddle by using knotted reactor (KR) method |
| CN103390098B (en) * | 2013-06-28 | 2016-07-06 | 武汉钢铁(集团)公司 | A kind of system of Desulfurization Calculation method and application thereof |
| CN105400929B (en) * | 2015-11-17 | 2017-09-29 | 北京首钢自动化信息技术有限公司 | A kind of control method of KR final sulfur contents |
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- 2016-10-18 CN CN201610907571.2A patent/CN106544471B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107586913A (en) * | 2017-08-25 | 2018-01-16 | 宁波钢铁有限公司 | A kind of efficient stirring desulphurization method |
| CN107586913B (en) * | 2017-08-25 | 2019-12-20 | 宁波钢铁有限公司 | High-efficiency stirring desulfurization method |
| CN108588318A (en) * | 2018-05-22 | 2018-09-28 | 武汉钢铁有限公司 | Molten iron mechanical agitation efficient low-consume sulfur method |
| CN108588318B (en) * | 2018-05-22 | 2019-11-08 | 武汉钢铁有限公司 | Molten iron mechanical stirring efficient low-consume sulfur method |
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