CN104596316B - Be suitable to the furnace power control method of the foamed slag working of a furnace - Google Patents

Abstract

The present invention proposes a kind of furnace power control method being suitable to the foamed slag working of a furnace, comprises the following steps: set the set value of the power P of electric furnace_set, and obtain actual power value P of electric furnace_act；Set value of the power P according to electric furnace_setWith actual power value P_actCalculate the current setting value I of electric furnace_setWith current measurement value I_act；According to current setting value I_setWith current measurement value I_actJudge whether electric furnace produces foamed slag；If generation foamed slag, then promote electrode with the first travel set point；And if not producing 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.Foamed slag can be predicted and identify by the method for the present invention, and controls electrode lifting, makes the fast quick-recovery of the working of a furnace normal, improves the safety that electric furnace runs.

Description

Be suitable to the furnace power control method of the foamed slag working of a furnace

Technical field

The present invention relates to smelting process technical field, particularly to a kind of furnace power control method being suitable to the foamed slag working of a furnace.

Background technology

Electric furnace has a wide range of applications in smelting process, such as the electric mantle heater in lead-zinc smelting, the dilution in Copper making, sedimentation Electric furnace, the electric melting furnace etc. in nickel-iron smelting.Electric furnace runs the most steady, often to whole technological process and the matter of final products Amount has vital impact.Strong nonlinearity yet with electric furnace control object so that its power automatically controls and easily loses Stable.Foamed slag be during electric furnace runs it is often the case that, it shows as electrode current and rises rapidly, now as can not be timely Control electrode lifting, will result in the serious consequence of furnace charge ejection.And this random skip under the foamed slag working of a furnace is changed, Conventional autocontrol method is difficult in adapt to, and needs artificial judgment and manually regulates.

Summary of the invention

It is contemplated that one of technical problem solved the most to a certain extent in above-mentioned correlation technique.

To this end, it is an object of the invention to propose a kind of furnace power control method being suitable to the foamed slag working of a furnace, the method can be right Foamed slag is predicted and identifies, and controls electrode lifting, makes the fast quick-recovery of the working of a furnace normal, improves what electric furnace ran Safety.

To achieve these goals, embodiments of the invention propose a kind of furnace power control method being suitable to the foamed slag working of a furnace, Comprise the following steps: set the set value of the power P of electric furnace_set, and obtain actual power value P of described electric furnace_act；According to described electricity The set value of the power P of stove_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 with First travel set point promotes electrode；And if not producing foamed slag, then according to the current setting value I of described electric furnace_setAnd electricity Flow measure I_actCalculate the lifting amplitude of electrode, and according to described lifting amplitude, described electrode is controlled.

The furnace power control method being suitable to the foamed slag working of a furnace according to embodiments of the present invention, by current setting value I_setAnd electricity Flow measure I_actIt is monitored, to judge whether electric furnace produces foamed slag, when monitoring generation foamed slag, exits conventional control Rule processed, makes electric current reduce rapidly by promoting electrode, so that foamed slag is quickly obtained alleviation and recovers, is not producing foam During slag, according to calculated lifting amplitude, electrode is controlled.To sum up, foamed slag can be carried out pre-by the method Survey and identify, and controlling electrode lifting, making the fast quick-recovery of the working of a furnace normal, improve the safety that electric furnace runs.

It addition, the furnace power control method being suitable to the foamed slag working of a furnace according to the above embodiment of the present invention can also have the most attached The technical characteristic added:

In some instances, the current setting value I of described electric furnace is calculated by below equation_setWith current measurement value I_act:

$I_{\mathrm{set}}=\frac{P_{\mathrm{set}}}{U},$

$I_{\mathrm{act}}=\frac{P_{\mathrm{act}}}{U},$

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 bubble Foam slag specifically includes: according to the current setting value I of described electric furnace_setWith current measurement value I_actCalculate t control error e (t) and miss Difference rate of change 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)≥Δe_set, then judge not produce foamed slag.

In some instances, according to below equation calculating t control error e (t) and error rate Δ e (t):

E (t)=I_set(t)-I_act(t),

Δ e (t)=e (t)-e (t-1),

Wherein, I_setT () is the current setting value of t, I_actT () is the current measurement value of t, e (t-1) is the control in t-1 moment Error processed.

In some instances, the lifting amplitude of described electrode is calculated by below equation:

D (t)=KP e (t)+KI de (t),

Wherein, KP is proportional control factor, and KI is derivative control coefficient.

In some instances, also include: if I_act(t)≥k·I_trip, then judge close to tripping operation, then with the second travel set point Promoting described electrode, wherein, k < 1 is safety factor, I_tripFor circuit breaker trip setting valve.

The additional aspect of the present invention and advantage will part be given in the following description, and part will become bright from the following description Aobvious, or recognized by the practice of the present invention.

Accompanying drawing explanation

Above-mentioned and/or the additional aspect of the present invention and advantage the accompanying drawings below description to embodiment will be apparent from from combining and Easy to understand, wherein:

Fig. 1 is the flow chart of the furnace power control method being suitable to 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 to 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 to the foamed slag working of a furnace according to an embodiment of the invention.

Detailed description of the invention

Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most identical or Similar label represents same or similar element or has the element of same or like function.Describe below with reference to accompanying drawing Embodiment is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.

Below in conjunction with accompanying drawing, the furnace power control method being suitable to the foamed slag working of a furnace according to embodiments of the present invention and device are described.

Fig. 1 is the flow chart of the furnace power control method being suitable to the foamed slag working of a furnace according to an embodiment of the invention.Fig. 2 is Be suitable to the flow chart of the furnace power control method of the foamed slag working of a furnace in accordance with another embodiment of the present invention.In conjunction with Fig. 1 and Fig. 2 Shown in, the method comprises the following steps:

Step S101, sets the set value of the power P of electric furnace_set, and obtain 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_setAnd electricity Flow measure I_act。

In one embodiment of the invention, the current setting value I of electric furnace is such as calculated by below equation_setAnd current measurement value I_act:

$I_{\mathrm{set}}=\frac{P_{\mathrm{set}}}{U},$

$I_{\mathrm{act}}=\frac{P_{\mathrm{act}}}{U},$

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, controls error e (t) and error rate Δ e (t) presents negative bigger Value (relative to the normal working of a furnace), thus, can be by e (t) and Δ e (t) be monitored and judge whether electric furnace produces foamed slag. When monitoring foamed slag and occurring, exit conventional control rule, make electric current reduce rapidly by promoting electrode, promote foamed slag to obtain To alleviating as early as possible and recovering.

In one embodiment of the invention, step S103 specifically includes:

Step 1: according to the current setting value I of electric furnace_setWith current measurement value I_actCalculate t and control error e (t) and error change Rate Δ e (t).More specifically, in some instances, calculate t according to below equation and control error e (t) and error rate Δ e (t):

E (t)=I_set(t)-I_act(t),

Δ e (t)=e (t)-e (t-1),

Wherein, I_setT () is the current setting value of t, I_actT () is the current measurement value of t, e (t-1) is the control in t-1 moment Error processed.

Step 2: if e (t) is ＜ e_setAnd Δ e (t) ＜ Δ e_set, then judge that producing foamed slag, i.e. electric furnace is dangerous foam scoriform State.

Step 3: if e (t) >=e_setOr Δ e (t) >=Δ e_set, then judge that not producing foamed slag, i.e. electric furnace is normal condition. Wherein, e_setWith Δ e_setControl error e (t) observed when can collapse expect according to history run and error rate Δ e (t) Data determine, in order to ensure the accuracy identified, in this example, e_setWith Δ e_setSuch as can be set to be in normal condition with An intermediate value between dangerous foamed slag state.

Step S104, if producing foamed slag, then promotes electrode with the first travel set point.In some instances, the first row Journey setting value for example, dmax1, wherein, dmax1 is the travel set point that electrode upwards does lifter motion, and it is real according to engineering Depending on the operating mode of border.

Step S105, if not producing foamed slag, then according to the current setting value I of electric furnace_setWith current measurement value I_actCalculate electrode Lifting amplitude, and according to lifting amplitude, electrode is controlled, lifts with drive electrode, and then make furnace power adjusted. More specifically, in one embodiment of the invention, such as by the lifting amplitude of below equation calculating 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 be according to Actual Control Effect of Strong Regulation.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 is usually associated with big current fluctuation, for avoiding sending out Raw overcurrent tripping, uses lifting electrode to reduce electric current when electrode current is close to trip value.Specifically, in the one of the present invention In individual embodiment, if I_act(t)≥k·I_trip, then judge close to tripping operation, 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.I_tripFor circuit breaker trip setting valve. Second travel set point for example, dmax2, wherein, dmax2 is the setting value of electrode lifting, and it is according to engineering actual condition Fixed.

To sum up, the furnace power control method being suitable to the foamed slag working of a furnace according to embodiments of the present invention, by current setting value I_set With current measurement value I_actIt is monitored, to judge whether electric furnace produces foamed slag, when monitoring generation foamed slag, often exits Rule control law, makes electric current reduce rapidly by promoting electrode, so that foamed slag is quickly obtained alleviation and recovers, is not producing During foamed slag, according to calculated lifting amplitude, electrode is controlled.To sum up, foamed slag can be entered by the method Row prediction and identification, and control electrode lifting, make the fast quick-recovery of the working of a furnace normal, improve the safety that electric furnace runs.

Further embodiment of the present invention additionally provides a kind of furnace power being suitable to the foamed slag working of a furnace and controls device.

Fig. 3 is the structured flowchart of the furnace power control device being suitable to the foamed slag working of a furnace according to an embodiment of the invention.Such as figure Shown in 3, this device 300 includes: 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.

Specifically, 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 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 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 by with Lower formula calculates the current setting value I of electric furnace respectively_setWith current measurement value I_act:

$I_{\mathrm{set}}=\frac{P_{\mathrm{set}}}{U},$

$I_{\mathrm{act}}=\frac{P_{\mathrm{act}}}{U},$

Wherein, U is electrode voltage.

Judge module 350 is connected with current setting value computing module 330 and actual current computing module 340 respectively, for basis Current setting value I_setWith current measurement value I_actJudge whether electric furnace produces foamed slag.Specifically, feature when foamed slag occurs Increase rapidly for electrode current, control error e (t) and error rate Δ e (t) presents negative higher value (relative to the normal working of a furnace), Thus, can be by e (t) and Δ e (t) be monitored and judge whether electric furnace produces foamed slag.When monitoring foamed slag and occurring, Exit conventional control rule, make electric current reduce rapidly by promoting electrode, promote foamed slag alleviated as early as possible and recover.

In one embodiment of the invention, it is judged that module 350 is according to current setting value I_setWith current measurement value I_actJudge electric furnace Whether produce foamed slag, specifically include:

Step 1: according to the current setting value I of electric furnace_setWith current measurement value I_actCalculate t and control error e (t) and error change Rate Δ e (t).More specifically, in some instances, calculate t according to below equation and control error e (t) and error rate Δ e (t):

E (t)=I_set(t)-I_act(t),

Δ e (t)=e (t)-e (t-1),

Wherein, I_setT () is the current setting value of t, I_actT () is the current measurement value of t, e (t-1) is the control in t-1 moment Error processed.

Step 2: if e (t) is ＜ e_setAnd Δ e (t) ＜ Δ e_set, then judge that producing foamed slag, i.e. electric furnace is dangerous foam scoriform State.

Step 3: if e (t) >=e_setOr Δ e (t) >=Δ e_set, then judge that not producing foamed slag, i.e. electric furnace is normal condition. Wherein, e_setWith Δ e_setControl error e (t) observed when can collapse expect according to history run and error rate Δ e (t) Data determine, in order to ensure the accuracy identified, in this example, e_setWith Δ e_setSuch as can be set to be in normal condition with An intermediate value between dangerous foamed slag state.

Lifting amplitude computing module 360 is not for when producing foam, according to the current setting value I of electric furnace_setAnd current measurement value I_actCalculate the lifting amplitude of electrode.In one embodiment of the invention, as calculated the lifting amplitude of electrode by below equation:

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 be according to Actual Control Effect of Strong Regulation.De (t) is the value of error change amount.

Control module 370 is connected with described judge module 350, is used for when judge module 350 judges that electric furnace produces foamed slag, Promote electrode with the first travel set point, and when electric furnace does not produces foamed slag, according to lifting amplitude, electrode be controlled, Lift with drive electrode, and then make furnace power adjusted.Specifically, in some instances, the first travel set point is such as For dmax1, wherein, dmax1 is the travel set point that electrode upwards does lifter motion, and it is according to depending on engineering actual condition.

Further, in the actual moving process of electric furnace, the foamed slag working of a furnace is usually associated with big current fluctuation, for avoiding sending out Raw overcurrent tripping, uses lifting electrode to reduce electric current when electrode current is close to trip value.Specifically, in the one of the present invention In individual embodiment, it is judged that module 350 is additionally operable to work as I_act(t)≥k·I_tripTime, it is judged that close to tripping operation, now, control module 370 Promoting 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.I_tripFor circuit breaker trip setting valve.Second travel set point for example, dmax2, wherein, dmax2 is that electrode carries The setting value risen, it is according to depending on engineering actual condition.

To sum up, the furnace power being suitable to the foamed slag working of a furnace according to embodiments of the present invention controls device, by current setting value I_setWith current measurement value I_actIt is monitored, to judge whether electric furnace produces foamed slag, when monitoring generation foamed slag, exits Conventional control rule, makes electric current reduce rapidly by promoting electrode, so that foamed slag is quickly obtained alleviation and recovers, is not producing During raw foamed slag, according to calculated lifting amplitude, electrode is controlled.To sum up, this device can be to the generation of foamed slag It is predicted and identifies, and controlling electrode lifting, making the fast quick-recovery of the working of a furnace normal, improve the safety that electric furnace runs.

In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", " length ", " width ", " thickness Degree ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward ", " suitable Hour hands ", " counterclockwise ", " axially ", " radially ", the orientation of the instruction such as " circumferential " or position relationship be based on orientation shown in the drawings Or position relationship, it is for only for ease of the description present invention and simplifies description rather than instruction or imply that the device of indication or element must Must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.

Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance or The implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or implicit Ground includes at least one this feature.In describing the invention, " multiple " are meant that at least two, such as two, three etc., Unless otherwise expressly limited specifically.

In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", the art such as " fixing " Language should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be that machinery connects Connect, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, in can being two elements The connection in portion or the interaction relationship of two elements, unless otherwise clear and definite restriction.For those of ordinary skill in the art Speech, can understand above-mentioned term concrete meaning in the present invention 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 One directly contacts with second feature, or the first and second features are by intermediary mediate contact.And, fisrt feature is second Feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or it is special to be merely representative of first Levy level height higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be that fisrt feature exists Immediately below second feature or obliquely downward, or it is merely representative of fisrt feature level height less than second feature.

In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " concrete example ", Or specific features, structure, material or the feature that the description of " some examples " etc. means to combine this embodiment or example describes comprises In at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term necessarily for Be identical embodiment or example.And, the specific features of description, structure, material or feature can any one or many Individual embodiment or example combine in an appropriate manner.Additionally, in the case of the most conflicting, those skilled in the art can It is combined with the feature of the different embodiments described in this specification or example and different embodiment or example and combines.

Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is exemplary, Being not considered as limiting the invention, above-described embodiment can be entered by those of ordinary skill in the art within the scope of the invention Row changes, revises, replaces and modification.

Claims (5)

1. the furnace power control method being suitable to the foamed slag working of a furnace, it is characterised in that comprise the following steps:

Set the set value of the power P of electric furnace_set, and obtain actual power value P of described electric furnace_act；

Set value of the power P according to 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, specifically include: according to the current setting value I of described electric furnace_setWith current measurement value I_actCalculate t and control error e (t) and error rate △ e (t), if e (t) is < e_setAnd △ e (t) < △ e_set, then judge to produce foamed slag, if e (t) >=e_setOr △ e (t) >=△ e_set, then judge not produce foamed slag；

If generation foamed slag, then promote electrode with the first travel set point；And

If not producing 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.

Be suitable to the furnace power control method of the foamed slag working of a furnace the most as claimed in claim 1, it is characterised in that calculated the current setting value I of described electric furnace by below equation_setWith current measurement value I_act:

Wherein, U is electrode voltage.

Be suitable to the furnace power control method of the foamed slag working of a furnace the most as claimed in claim 1, it is characterised in that according to below equation calculating t control error e (t) and error rate △ e (t):

E (t)=I_set(t)-I_act(t),

△ e (t)=e (t)-e (t-1),

Wherein, I_setT () is the current setting value of t, I_actT () is the current measurement value of t, e (t-1) is the control error in t-1 moment.

Be suitable to the furnace power control method of the foamed slag working of a furnace the most as claimed in claim 1, it is characterised in that calculated the lifting amplitude of described electrode by below equation:

D (t)=KP e (t)+KI de (t),

Wherein, KP is proportional control factor, and KI is derivative control coefficient.

Be suitable to the furnace power control method of the foamed slag working of a furnace the most as claimed in claim 3, it is characterised in that also include:

If I_act(t)≥k·I_trip, then judge close to tripping operation, then promoting described electrode with the second travel set point, wherein, k < 1 is safety factor, I_tripFor circuit breaker trip setting valve.