CN104596316A - Electric furnace power control method suitable for foaming slag furnace condition - Google Patents
Electric furnace power control method suitable for foaming slag furnace condition Download PDFInfo
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- CN104596316A CN104596316A CN201510039403.1A CN201510039403A CN104596316A CN 104596316 A CN104596316 A CN 104596316A CN 201510039403 A CN201510039403 A CN 201510039403A CN 104596316 A CN104596316 A CN 104596316A
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Abstract
The invention provides an electric furnace power control method suitable for foaming slag furnace condition. The electric furnace power control method comprises the following steps: setting a power set value Pset of an electric furnace, and obtaining the practical power value Pact of the electric furnace; calculating the current set value Iset and the current measured value Iact of the electric furnace according to the power set value Pset and the practical power value Pact of the electric furnace; judging whether foaming slag is generated in the electric furnace according to the current set value Iset and the current measured value Iact; if the foaming slag is generated, promoting electrodes by using a first travel set value; if the foaming slag is not generated, calculating the lifting amplitude of the electrodes according to the current set value Iset and the current measured value Iact of the electric furnace, and controlling the electrodes according to the lifting amplitude. According to the method provided by the invention, the generation of the foaming slag can be predicted and identified, and the promotion of the electrodes is controlled, so that the furnace condition is quickly recovered to normal, and the operating safety of the electric furnace is improved.
Description
Technical field
The present invention relates to smelting process technical field, particularly a kind of furnace power control method being suitable for the foamed slag working of a furnace.
Background technology
Electric furnace has a wide range of applications in smelting process, as the electric mantle heater in lead-zinc smelting, and the dilution in Copper making, sedimentation electric furnace, the electric melting furnace etc. in nickel-iron smelting.Whether electric furnace runs steady, often has vital impact to the quality of whole technological process and final products.But due to the strong nonlinearity of electric furnace control object, make its power automatically control very easily to lose stable.Foamed slag is situation about often occurring during electric furnace runs, and it shows as electrode current and rises rapidly, now as do not promoted by control electrode in time, and the serious consequence sprayed causing furnace charge.And for this random skip change under the foamed slag working of a furnace, conventional autocontrol method is difficult to adapt to, need artificial judgment and manual adjustments.
Summary of the invention
The present invention is intended to solve one of technical problem in above-mentioned correlation technique at least to a certain extent.
For this reason, the object of the invention is to propose a kind of furnace power control method being suitable for the foamed slag working of a furnace, the method can be predicted the carrying out of foamed slag and identify, and control electrode promotes, and makes the fast quick-recovery of the working of a furnace normal, improves the security that electric furnace runs.
To achieve these goals, embodiments of the invention propose a kind of furnace power control method being suitable for the foamed slag working of a furnace, comprise the following steps: the set value of the power P of setting electric furnace
set, and obtain the actual power value P of described electric furnace
act; According to the set value of the power P of described electric furnace
setwith actual power value P
actcalculate the current setting value I of described electric furnace
setwith current measurement value I
act; According to described current setting value I
setwith current measurement value I
actjudge whether described electric furnace produces foamed slag; If generation foamed slag, then promote electrode with the first travel set point; And if do not produce foamed slag, then according to the current setting value I of described electric furnace
setwith current measurement value I
actcalculate the lifting amplitude of electrode, and according to described lifting amplitude, described electrode is controlled.
According to the furnace power control method being suitable for the foamed slag working of a furnace of the embodiment of the present invention, by current setting value I
setwith current measurement value I
actmonitor, to judge whether electric furnace produces foamed slag, when monitoring generation foamed slag, exit conventional control rule, by promoting electrode, electric current is reduced rapidly, to make foamed slag be eased rapidly and recover, when not producing foamed slag, the lifting amplitude according to calculating controls electrode.To sum up, the method can be predicted the carrying out of foamed slag and identify, and control electrode promotes, and makes the fast quick-recovery of the working of a furnace normal, improves the security that electric furnace runs.
In addition, the furnace power control method being suitable for the foamed slag working of a furnace according to the above embodiment of the present invention can also have following additional technical characteristic:
In some instances, by the current setting value I of electric furnace described in following formulae discovery
setwith current measurement value I
act:
Wherein, U is electrode voltage.
In some instances, described according to described current setting value I
setwith current measurement value I
actjudge whether described electric furnace produces foamed slag and specifically comprise: according to the current setting value I of described electric furnace
setwith current measurement value I
actcalculate t departure e (t) and error rate Δ e (t); If e (t) < is e
setand Δ e (t) < Δ e
set, then judge to produce foamed slag; If e (t)>=e
setor Δ e (t)>=Δ e
set, then judge not produce foamed slag.
In some instances, according to following formulae discovery t departure e (t) and error rate Δ e (t):
e(t)＝I
set(t)-I
act(t)，
Δe(t)＝e(t)-e(t-1)，
Wherein, I
sett current setting value that () is t, I
actt current measurement value that () is t, the departure that e (t-1) is the t-1 moment.
In some instances, by the lifting amplitude of electrode described in following formulae discovery:
d(t)＝KP·e(t)+KI·de(t)，
Wherein, KP is proportional control factor, and KI is derivative control coefficient.
In some instances, also comprise: if I
act(t)>=kI
trip, then judge that then promote described electrode with the second travel set point, wherein, k<1 is safety factor, I close to tripping operation
tripfor circuit breaker trip setting valve.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the flow chart of the furnace power control method being suitable for the foamed slag working of a furnace according to an embodiment of the invention;
Fig. 2 is the flow chart of the furnace power control method being suitable for the foamed slag working of a furnace in accordance with another embodiment of the present invention; And
Fig. 3 is the structured flowchart of the furnace power control method being suitable for the foamed slag working of a furnace according to an embodiment of the invention.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Below in conjunction with accompanying drawing description according to the furnace power control method being suitable for the foamed slag working of a furnace of the embodiment of the present invention and device.
Fig. 1 is the flow chart of the furnace power control method being suitable for the foamed slag working of a furnace according to an embodiment of the invention.Fig. 2 is the flow chart of the furnace power control method being suitable for the foamed slag working of a furnace in accordance with another embodiment of the present invention.Shown in composition graphs 1 and Fig. 2, the method comprises the following steps:
Step S101, the set value of the power P of setting electric furnace
set, and obtain the actual power value P of electric furnace
act.
Step S102, according to the set value of the power P of electric furnace
setwith actual power value P
actcalculate the current setting value I of electric furnace
setwith current measurement value I
act.
In one embodiment of the invention, such as, by the current setting value I of following formulae discovery electric furnace
setwith current measurement value I
act:
Wherein, U is electrode voltage.
Step S103, according to current setting value I
setwith current measurement value I
actjudge whether electric furnace produces foamed slag.Specifically, feature when foamed slag occurs is that electrode current increases rapidly, departure e (t) and error rate Δ e (t) present negative higher value (relative to the normal working of a furnace), thus, by monitoring e (t) and Δ e (t) and judge whether electric furnace produces foamed slag.When monitoring foamed slag and occurring, exit conventional control rule, by promoting electrode, electric current being reduced rapidly, impelling foamed slag alleviated as early as possible and recover.
In one embodiment of the invention, step S103 specifically comprises:
Step 1: according to the current setting value I of electric furnace
setwith current measurement value I
actcalculate t departure e (t) and error rate Δ e (t).More specifically, in some instances, according to following formulae discovery t departure e (t) and error rate Δ e (t):
e(t)＝I
set(t)-I
act(t)，
Δe(t)＝e(t)-e(t-1)，
Wherein, I
sett current setting value that () is t, I
actt current measurement value that () is t, the departure that e (t-1) is the t-1 moment.
Step 2: if e (t) < is e
setand Δ e (t) < Δ e
set, then judge to produce foamed slag, namely electric furnace is dangerous foamed slag state.
Step 3: if e (t)>=e
setor Δ e (t)>=Δ e
set, then judge not produce foamed slag, namely electric furnace is normal condition.Wherein, e
setwith Δ e
setthe departure e (t) observed when can collapse and expect according to history run and the data of error rate Δ e (t) are determined, in order to ensure the accuracy identified, in this example, and e
setwith Δ e
setsuch as can be set to the median be between normal condition and dangerous foamed slag state.
Step S104, if produce foamed slag, then promotes electrode with the first travel set point.In some instances, the first travel set point is such as dmax1, and wherein, dmax1 is the travel set point that electrode upwards does lifter motion, and it is determined according to engineering actual condition.
Step S105, if do not produce foamed slag, then according to the current setting value I of electric furnace
setwith current measurement value I
actcalculate the lifting amplitude of electrode, and according to lifting amplitude, electrode is controlled, with drive electrode lifting, and then make furnace power adjusted.More specifically, in one embodiment of the invention, such as, by the lifting amplitude of following formulae discovery electrode:
d(t)＝KP·e(t)+KI·de(t)，
Wherein, KP is proportional control factor, and KI is derivative control coefficient, and the value of KP and KI such as can regulate according to Actual Control Effect of Strong.De (t) is the value of error change amount.
Further, in the actual moving process of electric furnace, the foamed slag working of a furnace, often along with large current fluctuation, for avoiding that overcurrent tripping occurs, reduces electric current when electrode current promotes electrode close to employing during trip value.Specifically, in one embodiment of the invention, if I
act(t)>=kI
trip, then judge that then promote described electrode with the second travel set point, wherein, k<1 is safety factor, and in concrete example, the general value of k is 0.7 ~ 0.8 close to tripping operation.I
tripfor circuit breaker trip setting valve.Second travel set point is such as dmax2, and wherein, dmax2 is the setting value of electrode lifting, and it is determined according to engineering actual condition.
To sum up, according to the furnace power control method being suitable for the foamed slag working of a furnace of the embodiment of the present invention, by current setting value I
setwith current measurement value I
actmonitor, to judge whether electric furnace produces foamed slag, when monitoring generation foamed slag, exit conventional control rule, by promoting electrode, electric current is reduced rapidly, to make foamed slag be eased rapidly and recover, when not producing foamed slag, the lifting amplitude according to calculating controls electrode.To sum up, the method can be predicted the carrying out of foamed slag and identify, and control electrode promotes, and makes the fast quick-recovery of the working of a furnace normal, improves the security that electric furnace runs.
The present invention embodiment still provides a kind of furnace power control device being suitable for the foamed slag working of a furnace further.
Fig. 3 is the structured flowchart of the furnace power control device being suitable for the foamed slag working of a furnace according to an embodiment of the invention.As shown in Figure 3, this device 300 comprises: power setting module 310, power acquisition module 320, current setting value computing module 330, actual current computing module 340, judge module 350, lifting amplitude computing module 360 and control module 370.
Particularly, power setting module 310 is for setting the set value of the power P of electric furnace
set.
Power acquisition module 320 is for obtaining the actual power value P of electric furnace
act.
Current setting value computing module 330 is for the set value of the power P according to electric furnace
setcalculate the current setting value I of electric furnace
set.
Actual current computing module 340 is for the actual power value P according to electric furnace
actcalculate the current measurement value I of electric furnace
act.
In one embodiment of the invention, current setting value computing module 330 and actual current computing module 340 such as calculate the current setting value I of electric furnace respectively by following formula
setwith current measurement value I
act:
Wherein, U is electrode voltage.
Judge module 350 is connected with actual current computing module 340 with current setting value computing module 330 respectively, for according to current setting value I
setwith current measurement value I
actjudge whether electric furnace produces foamed slag.Specifically, feature when foamed slag occurs is that electrode current increases rapidly, departure e (t) and error rate Δ e (t) present negative higher value (relative to the normal working of a furnace), thus, by monitoring e (t) and Δ e (t) and judge whether electric furnace produces foamed slag.When monitoring foamed slag and occurring, exit conventional control rule, by promoting electrode, electric current being reduced rapidly, impelling foamed slag alleviated as early as possible and recover.
In one embodiment of the invention, judge module 350 is according to current setting value I
setwith current measurement value I
actjudge whether electric furnace produces foamed slag, specifically comprises:
Step 1: according to the current setting value I of electric furnace
setwith current measurement value I
actcalculate t departure e (t) and error rate Δ e (t).More specifically, in some instances, according to following formulae discovery t departure e (t) and error rate Δ e (t):
e(t)＝I
set(t)-I
act(t)，
Δe(t)＝e(t)-e(t-1)，
Wherein, I
sett current setting value that () is t, I
actt current measurement value that () is t, the departure that e (t-1) is the t-1 moment.
Step 2: if e (t) < is e
setand Δ e (t) < Δ e
set, then judge to produce foamed slag, namely electric furnace is dangerous foamed slag state.
Step 3: if e (t)>=e
setor Δ e (t)>=Δ e
set, then judge not produce foamed slag, namely electric furnace is normal condition.Wherein, e
setwith Δ e
setthe departure e (t) observed when can collapse and expect according to history run and the data of error rate Δ e (t) are determined, in order to ensure the accuracy identified, in this example, and e
setwith Δ e
setsuch as can be set to the median be between normal condition and dangerous foamed slag state.
Be elevated amplitude computing module 360 for when not producing foam, according to the current setting value I of electric furnace
setwith current measurement value I
actcalculate the lifting amplitude of electrode.In one embodiment of the invention, as the lifting amplitude by following formulae discovery electrode:
d(t)＝KP·e(t)+KI·de(t)，
Wherein, KP is proportional control factor, and KI is derivative control coefficient, and the value of KP and KI such as can regulate according to Actual Control Effect of Strong.De (t) is the value of error change amount.
Control module 370 is connected with described judge module 350, during for judging that at judge module 350 electric furnace produces foamed slag, electrode is promoted with the first travel set point, and when electric furnace does not produce foamed slag, according to lifting amplitude, electrode is controlled, with drive electrode lifting, and then make furnace power adjusted.Particularly, in some instances, the first travel set point is such as dmax1, and wherein, dmax1 is the travel set point that electrode upwards does lifter motion, and it is determined according to engineering actual condition.
Further, in the actual moving process of electric furnace, the foamed slag working of a furnace, often along with large current fluctuation, for avoiding that overcurrent tripping occurs, reduces electric current when electrode current promotes electrode close to employing during trip value.Specifically, in one embodiment of the invention, judge module 350 is also for working as I
act(t)>=kI
triptime, judge that now, control module 370 promotes described electrode with the second travel set point, and wherein, k<1 is safety factor, and in concrete example, the general value of k is 0.7 ~ 0.8 close to tripping operation.I
tripfor circuit breaker trip setting valve.Second travel set point is such as dmax2, and wherein, dmax2 is the setting value of electrode lifting, and it is determined according to engineering actual condition.
To sum up, according to the furnace power control device being suitable for the foamed slag working of a furnace of the embodiment of the present invention, by current setting value I
setwith current measurement value I
actmonitor, to judge whether electric furnace produces foamed slag, when monitoring generation foamed slag, exit conventional control rule, by promoting electrode, electric current is reduced rapidly, to make foamed slag be eased rapidly and recover, when not producing foamed slag, the lifting amplitude according to calculating controls electrode.To sum up, this device can be predicted the carrying out of foamed slag and identify, and control electrode promotes, and makes the fast quick-recovery of the working of a furnace normal, improves the security that electric furnace runs.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this description or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (6)
1. be suitable for a furnace power control method for the foamed slag working of a furnace, it is characterized in that, comprise the following steps:
The set value of the power P of setting electric furnace
set, and obtain the actual power value P of described electric furnace
act;
According to the set value of the power P of described electric furnace
setwith actual power value P
actcalculate the current setting value I of described electric furnace
setwith current measurement value I
act;
According to described current setting value I
setwith current measurement value I
actjudge whether described electric furnace produces foamed slag;
If generation foamed slag, then promote electrode with the first travel set point; And
If do not produce foamed slag, then according to the current setting value I of described electric furnace
setwith current measurement value I
actcalculate the lifting amplitude of electrode, and according to described lifting amplitude, described electrode is controlled.
2. be suitable for the furnace power control method of the foamed slag working of a furnace as claimed in claim 1, it is characterized in that, by the current setting value I of electric furnace described in following formulae discovery
setwith current measurement value I
act:
Wherein, U is electrode voltage.
3. be suitable for the furnace power control method of the foamed slag working of a furnace as claimed in claim 1 or 2, it is characterized in that, described according to described current setting value I
setwith current measurement value I
actjudge whether described electric furnace produces foamed slag, specifically comprises:
According to the current setting value I of described electric furnace
setwith current measurement value I
actcalculate t departure e (t) and error rate Δ e (t);
If e (t) < is e
setand Δ e (t) < Δ e
set, then judge to produce foamed slag;
If e (t)>=e
setor Δ e (t)>=Δ e
set, then judge not produce foamed slag.
4. the furnace power control method being suitable for the foamed slag working of a furnace as described in any one of claim 1-3, is characterized in that, according to following formulae discovery t departure e (t) and error rate Δ e (t):
e(t)＝I
set(t)-I
act(t)，
Δe(t)＝e(t)-e(t-1)，
Wherein, I
sett current setting value that () is t, I
actt current measurement value that () is t, the departure that e (t-1) is the t-1 moment.
5. the furnace power control method being suitable for the foamed slag working of a furnace as described in any one of claim 1-3, is characterized in that, the lifting amplitude by electrode described in following formulae discovery:
d(t)＝KP·e(t)+KI·de(t)，
Wherein, KP is proportional control factor, and KI is derivative control coefficient.
6. the furnace power control method being suitable for the foamed slag working of a furnace as described in any one of claim 1-5, is characterized in that, also comprise:
If I
act(t)>=kI
trip, then judge that then promote described electrode with the second travel set point, wherein, k < 1 is safety factor, I close to tripping operation
tripfor circuit breaker trip setting valve.
Priority Applications (1)
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|---|---|---|---|
| CN201510039403.1A CN104596316B (en) | 2015-01-27 | 2015-01-27 | Be suitable to the furnace power control method of the foamed slag working of a furnace |
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| TWI667473B (en) * | 2018-07-24 | 2019-08-01 | 國立中興大學 | Method for measuring foaming height of molten slag |
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