CN104531978A - Non-oriented silicon steel heating method and modeling control method of non-oriented silicon steel heating method - Google Patents
Non-oriented silicon steel heating method and modeling control method of non-oriented silicon steel heating method Download PDFInfo
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- CN104531978A CN104531978A CN201510010460.7A CN201510010460A CN104531978A CN 104531978 A CN104531978 A CN 104531978A CN 201510010460 A CN201510010460 A CN 201510010460A CN 104531978 A CN104531978 A CN 104531978A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/70—Furnaces for ingots, i.e. soaking pits
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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Abstract
The invention discloses a non-oriented silicon steel heating method and a modeling control method of the non-oriented silicon steel heating method. By means of the non-oriented silicon steel heating method, silicon steel can be heated through a walking beam furnace. The non-oriented silicon steel heating method includes the following steps: heating control regions are divided according to the percentage content of silicon in the silicon steel; the furnace box temperature is detected; the heating control region of the silicon steel is selected, and the furnace box temperature is adjusted; soaking processing is carried out on the silicon steel. By means of the modeling control method, automatic control over the non-oriented silicon steel heating method can be achieved; the modeling control method includes the following steps: control models are built according to the heating control regions of the silicon steel; the control models and the furnace box temperature obtained through measurement are stored in a storage device of a process PLC; a selector and a comparator are arranged on the PLC, and the control model corresponding to the silicon steel is selected through the selector; the furnace box temperature is compared with the heating temperature in the control model through the comparator, and the furnace box temperature is adjusted through comparison results. By means of the methods, the silicon steel can be heated through the walking beam furnace, and the work efficiency is improved; the production cost is reduced.
Description
Technical field
The present invention relates to Steel Rolling Control technical field, especially a kind of non orientating silicon steel heating means also relate to a kind of modelling control method of non orientating silicon steel heating means.
Background technology
Known: along with the fast development of national economy, the demand of motor is increased year by year, non orientating silicon steel as the important component part of motor, more and more by more iron and steel enterprise as main production kind.Described non orientating silicon steel refers to: the ferro-silicon that carbon containing is very low; In steel plate after deformation and annealing, its crystal grain is random orientation distribution.The silicone content of alloy is 1.5% ~ 3.O%, or sial content sum is 1.8% ~ 4.0%.
Silicon steel requires high to iron loss and magnetic induction density, the non orientating silicon steel of the especially high trade mark, iron loss and magnetic induction density are two important indicators weighing silicon steel quality, countries in the world all divide the trade mark with core loss value, iron loss is lower, the trade mark is higher, quality is also high, certain magnetic induction density is as another important indicator, the siliconized plate of higher magnetic strength mainly can be obtained under same magnetic field, the motor manufactured with its or the volume and weight of transformer core less, siliconized plate, copper cash and insulating material etc. can be saved comparatively speaking.In silicon steel production process, the heating that of paramount importance operation is silicon steel strand is affected on iron loss and magnetic induction density, in order to obtain good iron loss and the silicon steel of magnetic induction density, the non orientating silicon steel of the especially high trade mark.In the heat-treatment process of silicon steel, to the heating accuracy of the Heating temperature of silicon steel and the equal heat treatment requirements of silicon steel higher, need the homogeneous temperature at each position on higher heating accuracy and silicon steel.Because walking beam furnace is in the process of heating low-temperature steel, because each physical segment (heat-recovery section, preheating section, heating zone, soaking zone etc.) has carried out tune flame or the process of restriction load to burner, so high temperature gas flow can not be full of whole burner hearth, there will be localized hyperthermia or topical hypothermia, in air current flow process, cause thermopair detected temperatures fluctuated.This detected temperatures uploads to process automation system by basic automatization PLC, and Combustion System model utilizes this detected temperatures to carry out steel billet temperature calculating and completes burner hearth design temperature and calculates.If detected temperatures is forbidden, then make model prediction steel billet temperature be forbidden, finally cause model errors decision-making, occur steel billet burning or Heating temperature not, affect low-temperature steel rolling and stablize and end product quality.Therefore walking beam furnace heating accuracy is low, and walking beam furnace cannot realize the heat treated to silicon steel.
Described heating accuracy refers to the error in Heating temperature and burner hearth between actual temperature.The less heating accuracy of error in Heating temperature and burner hearth between actual temperature is higher, and the larger heating accuracy of error in Heating temperature and burner hearth between actual temperature is lower.
In prior art, mainly take to build silicon steel heating special heating furnace.But the fund needing input a large amount of built by silicon steel heating special heating furnace, extends a factory building, therefore cause the cycle of investment and production long and the human and material resources of at substantial.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of non orientating silicon steel heating means, the heating making walking beam furnace can realize silicon steel by the method.
The technical solution adopted for the present invention to solve the technical problems is: non orientating silicon steel heating means, adopts walking beam furnace heating, comprises the following steps successively:
1) scope of the weight percent content of silicon in silicon steel (Si) is divided into multiple control interval; According to the heating requirements of silicon steel at each control interval; Determine the heating parameters of silicon steel in each silicon steel control interval; Determine the Heating temperature adjusting deviation that actual temperature in heating zone burner hearth is corresponding with difference between Heating temperature; The stove preheating section that silicon steel strand enters stepped heating carries out preheating; Until silicon steel strand temperature is 500 ~ 650 DEG C;
2) the silicon steel strand after preheating enters walking beam furnace heating zone, according to the degree determination silicon steel control interval of silicon (Si) in silicon steel strand in walking beam furnace; The silicon steel Heating temperature T corresponding according to the silicon steel control interval determined controls the temperature of process furnace heating zone;
3) silicon steel strand enters in walking beam furnace heating zone process, adopts the process temperature check processing method of walking beam furnace heating low-temperature steel to detect the actual temperature Ta of district's burner hearth and the actual temperature Tb of heating zone inferior segment burner hearth in walking beam furnace heating zone;
4) according to step 3) in obtain process furnace heating zone on the actual temperature Ta of district's burner hearth and the actual temperature Tb of heating zone inferior segment burner hearth compare separately with silicon steel Heating temperature T respectively;
According to the actual temperature Ta of district's burner hearth in heating zone and the comparative result of Heating temperature T; Determine upper district Heating temperature adjusting deviation Δ T1; The Heating temperature regulating district's burner hearth in heating zone is T+ Δ T1;
According to the actual temperature Tb of heating zone inferior segment burner hearth and the comparative result of Heating temperature T; Determine inferior segment Heating temperature adjusting deviation Δ T2; The Heating temperature regulating heating zone inferior segment burner hearth is T+ Δ T2;
5) silicon steel strand is heated to target temperature 1150-1180 DEG C in heating zone, enters into walking beam furnace soaking zone, regulates the temperature-control device of soaking zone, makes the soaking temperature of soaking zone be target temperature ± 5 DEG C;
6) silicon steel strand is soaked to each several part temperature on silicon steel strand in soaking zone is soaking temperature, then comes out of the stove.
Further, in step 5) in further comprising the steps of: regulate air intake, guarantee that Control for Oxygen Content is 2 ~ 6%; Regulate the pressure in burner hearth, guarantee that furnace pressure is 1 ~ 10Pa.
Further, step 6) mid-early stage enters silicon steel strand soaking more than 30 minutes in soaking zone of walking beam furnace soaking zone, and the later stage enters silicon steel strand soaking more than 40 minutes in soaking zone of walking beam furnace soaking zone.
By the heating that above-mentioned non orientating silicon steel heating means can make walking beam furnace can realize silicon steel, thus avoid to silicon steel heating in order to realize, reconstruct process furnace, shortening the construction cycle, saved operation cost; Achieve the multi-use of walking beam furnace simultaneously.
Present invention also offers a kind of modelling control method realizing the non orientating silicon steel heating means of non orientating silicon steel heating means Automated condtrol, comprise the following steps:
A, by step 1) in each silicon steel control interval heating parameters of obtaining set up Temperature Control Model, and be stored in the storer on the PLC of process automation; The Heating temperature adjusting deviation corresponding with difference between Heating temperature according to the actual temperature in heating zone burner hearth sets up temperature difference Controlling model; And be stored in the storer on the PLC of process automation; Require to set up constant temperature model according to the uniform heating process of silicon steel strand, constant temperature model is stored in the storer on the PLC of process automation; One is arranged for selecting the selector switch of heating parameters Controlling model, constant temperature selector switch and a comparer compared for heating zone burner hearth actual temperature and silicon steel Heating temperature in the PLC of process automation;
B, step 2) in PLC according to the degree of silicon (Si) in silicon steel strand in walking beam furnace by silicon steel Heating temperature T corresponding to silicon steel strand in selector switch selective temperature Controlling model; Heating temperature T is sent to the temperature of the temperature-control device control heating zone of process furnace heating zone by PLC;
C, by step 3) in adopt the process temperature check processing method of walking beam furnace heating low-temperature steel to detect the actual temperature Ta of district's burner hearth and the actual temperature Tb of heating zone inferior segment burner hearth in the heating zone that obtains to be sent to the PLC of process automation by transmitter; Be stored in the storer in PLC;
D, PLC are compared the actual temperature Ta of district's burner hearth in heating zone and Heating temperature T by comparer; Corresponding upper district Heating temperature adjusting deviation Δ T1 is selected by temperature difference selector switch according to comparative result; Control the actual temperature of district's burner hearth in heating zone;
PLC is compared the actual temperature Tb of heating zone inferior segment burner hearth and Heating temperature T by comparer; According to comparative result; Corresponding inferior segment Heating temperature adjusting deviation Δ T2 is selected by temperature difference selector switch; Control the actual temperature of heating zone inferior segment burner hearth;
E, enter time of soaking zone according to silicon steel strand, by the soaking of the constant temperature model cootrol walking beam furnace soaking zone silicon steel strand in constant temperature selector switch word-select memory.
Concrete, described Controlling model comprises Heating temperature, heat flow density, heat emissivity coefficient, the shortest time inside furnace.
Concrete, described constant temperature model comprises thermostat temperature, constant temperature time.
Further, the PLC of process automation is arranged parameter comparer and a warning device for reporting to the police that a processing parameter required for actual process parameter in silicon steel heat-processed and silicon steel heating process compares; State modulator model is set up according to the oxygen level in the burner hearth that silicon steel heating process requires, furnace pressure; By state modulator model storage in the storer of the PLC of process automation;
By by oxygen level in the residual oxygen detection in walking beam furnace the burner hearth to schedule burner hearth that arrives of interval measurement, measured the real data of pressure in the burner hearth by pressure detecting instrument; The real data of described oxygen level and pressure in the burner hearth is sent to the PLC of process automation by transmitter;
By the comparer on PLC, the oxygen level in the oxygen level obtained and state modulator model is compared; When exceeding the oxygen level scope in state modulator model when step oxygen level; PLC controls warning device and reports to the police; When not exceeding the oxygen level scope in state modulator model when oxygen level, warning howler is not reported to the police;
By comparer, the furnace pressure in the real data of furnace pressure and state modulator model is compared; When exceeding the furnace pressure scope in state modulator model when furnace pressure; PLC controls warning device and reports to the police; When not exceeding the furnace pressure scope in state modulator model when furnace pressure; Warning howler is not reported to the police.
By the modelling control method of non orientating silicon steel heating means, the modelling control to non orientating silicon steel heating means can be realized, thus increase work efficiency, reduce costs, reduce labor strength, optimize the Working environment of workman.
Accompanying drawing explanation
Fig. 1 is the schema of non orientating silicon steel heating means.
Fig. 2 is the logical diagram of non orientating silicon steel heating means Automated condtrol.
Fig. 3 is the Automated condtrol logical diagram at walking beam furnace soaking zone of non orientating silicon steel.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
Non orientating silicon steel heating means, adopt walking beam furnace heating, comprise the following steps successively:
1) scope of the weight percent content of silicon in silicon steel (Si) is divided into multiple control interval; According to the heating requirements of silicon steel at each control interval; Determine the heating parameters of silicon steel in each silicon steel control interval; Determine the Heating temperature adjusting deviation that actual temperature in heating zone burner hearth is corresponding with difference between Heating temperature; The stove preheating section that silicon steel strand enters stepped heating carries out preheating; Until silicon steel strand temperature is 500 ~ 650 DEG C;
2) the silicon steel strand after preheating enters walking beam furnace heating zone, according to the degree determination silicon steel control interval of silicon (Si) in silicon steel strand in walking beam furnace; The silicon steel Heating temperature T corresponding according to the silicon steel control interval determined controls the temperature of process furnace heating zone;
3) silicon steel strand enters in walking beam furnace heating zone process, adopts the process temperature check processing method of walking beam furnace heating low-temperature steel to detect the actual temperature Ta of district's burner hearth and the actual temperature Tb of heating zone inferior segment burner hearth in walking beam furnace heating zone;
4) according to step 3) in obtain process furnace heating zone on the actual temperature Ta of district's burner hearth and the actual temperature Tb of heating zone inferior segment burner hearth compare separately with silicon steel Heating temperature T respectively;
According to the actual temperature Ta of district's burner hearth in heating zone and the comparative result of Heating temperature T; Determine upper district Heating temperature adjusting deviation Δ T1; The Heating temperature regulating district's burner hearth in heating zone is T+ Δ T1;
According to the actual temperature Tb of heating zone inferior segment burner hearth and the comparative result of Heating temperature T; Determine inferior segment Heating temperature adjusting deviation Δ T2; The Heating temperature regulating heating zone inferior segment burner hearth is T+ Δ T2;
5) silicon steel strand is heated to target temperature 1150-1180 DEG C in heating zone, enters into walking beam furnace soaking zone, regulates the temperature-control device of soaking zone, makes the soaking temperature of soaking zone be target temperature ± 5 DEG C;
6) silicon steel strand is soaked to each several part temperature on silicon steel strand in soaking zone is soaking temperature, then comes out of the stove.
In step 1) in the scope of the weight percent content of silicon in silicon steel (Si) is divided into multiple control interval; According to the heating requirements of silicon steel at each control interval; Determine the heating parameters of silicon steel in each silicon steel control interval; The stove preheating section that silicon steel strand enters stepped heating carries out preheating; Until silicon steel strand temperature is 500 ~ 650 DEG C.
Such as: in silicon steel, the scope of the weight percent content of silicon (Si) is [a1, an]; The described scope by the weight percent content of silicon in silicon steel (Si) is divided into multiple control interval and refers to: [a1, an] this scope is divided into several little scope; As [a1, a2], [a2, a3], [a3, a4] ..., [a (n-1), an], wait multiple interval, wherein a1<a2<a3< ... <an; Belong to the heating parameters that two interval points can get the silicon steel in any one control interval at its place simultaneously.
Due to the steel grade that silicon steel is special, its heating requirements is higher; With also different according to the content of silicon (S i) its heating condition different in silicon steel.Therefore in step 1) according to the degree of silicon in silicon steel (Si), silicon steel to be carried out to the division in computer heating control interval.Thus the refinement heating condition of silicon steel, silicon in silicon steel (Si) can be heated according to corresponding heating parameters when different content, avoid because heating damages the electric property of silicon steel.The preheating temperature of silicon steel 500 ~ 650 DEG C is known pre-thermal parameter in the heating process of silicon steel.
Simultaneously silicon steel strand carries out preheating at walking beam furnace preheating section, avoids silicon steel strand and directly heats, and the temperature difference due to silicon steel strand outside surface and internal temperature causes greatly the change of the inner crystalline phase body of silicon steel, thus affects the electric property of silicon steel.Therefore first thermal pretreatment is carried out to silicon steel, silicon steel inside and outside temperature difference of silicon steel strand in heat-processed can be made less, be conducive to ensureing that the inside and outside of silicon steel is heated evenly.
In step 2) in select corresponding computer heating control interval according to the degree of silicon in silicon steel strand, regulate the Heating temperature of heating zone according to the interval corresponding heating parameters of the computer heating control selected.According to the silicon steel control interval that the degree of silicon (Si) in the silicon steel strand in walking beam furnace stove is selected, the heating process requirement of silicon steel strand in stove could be met.Thus make the temperature of process furnace heating zone meet the requirement of silicon steel strand heating in theory.
In step 3) in silicon steel strand after preheating enter walking beam furnace heating zone, adopt the process temperature check processing method of walking beam furnace heating low-temperature steel to detect the fire box temperature in district and the fire box temperature of heating zone inferior segment in walking beam furnace heating zone.
The process temperature check processing method of described walking beam furnace heating low-temperature steel for known patent name be " walking beam furnace heats the process temperature check processing of low-temperature steel " patent No. prior art disclosed in the patent application of ZL 201110326347.1.
The process temperature check processing method of described walking beam furnace heating low-temperature steel mainly comprises the following steps:
(1) heating zone of walking beam furnace during heating low-temperature steel is divided into upper district and inferior segment, arranges the first thermopair and the second thermopair respectively in the left and right sides, upper district, arrange three thermocouple and the 4th thermopair in the inferior segment left and right sides respectively;
(2) according to the actual heat supplied of heating zone and the ratio of maximum heat supplied, the high temperature gas flow of heating zone and the high and low temperature weight of low-temperature airflow is determined;
(3) first thermopairs, two thermopairs, three thermocouple and the 4th thermopair interval measurement burner hearth actual temperature to schedule;
(4) from the burner hearth actual temperature of the first thermocouple measurement, gather the burner hearth actual temperature of pre-determined quantity n, and from the burner hearth actual temperature of the second thermocouple measurement, gather the burner hearth actual temperature of same predetermined number n, use the high and low temperature weight of heating zone to be weighted process to the burner hearth actual temperature gathered;
(5) data that weighting process obtains are averaging processing, obtain the fire box temperature in district in heating zone;
(6) from the burner hearth actual temperature that three thermocouple is measured, gather the burner hearth actual temperature of same predetermined number n, and from the burner hearth actual temperature of the 4th thermocouple measurement, gather the burner hearth actual temperature of same predetermined number n, use the high and low temperature weight of heating zone to be weighted process to the burner hearth actual temperature gathered;
(7) data that weighting process obtains are averaging processing, obtain the fire box temperature of heating zone inferior segment.
In step 4) according to the degree determination silicon steel control interval of silicon in silicon steel in walking beam furnace (Si); In step 4 according to silicon steel Heating temperature and step 2 in the heating parameters of the silicon steel control interval determined) in the heating zone that obtains the fire box temperature Ta in district and the fire box temperature Tb of heating zone inferior segment compare separately respectively;
According to the actual temperature Ta of district's burner hearth in heating zone and the comparative result of Heating temperature T; Determine upper district Heating temperature adjusting deviation Δ T1; The Heating temperature regulating district's burner hearth in heating zone is T+ Δ T1;
According to the actual temperature Tb of heating zone inferior segment burner hearth and the comparative result of Heating temperature T; Determine inferior segment Heating temperature adjusting deviation Δ T2; The Heating temperature regulating heating zone inferior segment burner hearth is T+ Δ T2;
The fire box temperature of the fire box temperature in district in heating zone and heating zone inferior segment is finally made to be the Heating temperature of silicon steel.
Due to can certain error be there is between the actual temperature value of process furnace and heat set points in the process of heating; Simultaneously because the accuracy requirement of heating process to Heating temperature of silicon steel is higher, heating accuracy is typically chosen in ± and 5 DEG C.Heating accuracy refers to the error between Heating temperature and actual Heating temperature.Therefore need strictly to control the Heating temperature of walking beam furnace heating zone; Otherwise the heat treated that can not realize silicon steel strand; Physical properties after causing silicon steel strand to heat and mechanical property can not meet production requirement.
Due in step 3) in the fire box temperature that measured by the process temperature check processing method of walking beam furnace heating low-temperature steel little with actual fire box temperature error.Therefore in step 4) in utilize step 3) in the upper district burner hearth actual temperature Ta that measures and inferior segment burner hearth actual temperature Tb compare with Heating temperature respectively, then by comparative result, district in walking beam furnace heating zone and heating zone inferior segment are carried out separately to the adjustment of Heating temperature.Thus it is uneven to overcome walking beam furnace heating, heating zone burner hearth Nei Shang district and the inconsistent problem of inferior segment temperature.Make walking beam furnace heating zone can meet the heating requirements of silicon steel strand heating process.
In step 5) middle silicon steel strand is after heating zone is heated to 500 ~ 650 DEG C, and enter into walking beam furnace soaking zone, the temperature-control device of adjustment soaking zone, makes the soaking temperature of soaking zone be 1180 ± 5 DEG C.By carrying out equal thermal treatment to silicon steel strand, can eliminate that silicon steel strand causes when heating zone heats inside and outside between the less error that may exist; The tapping temperature of silicon steel strand is regulated simultaneously, control silicon steel tapping temperature, ensure the physical properties of silicon steel.
In step 6) in silicon steel strand in soaking zone, be soaked to each several part temperature on silicon steel strand be soaking temperature, then come out of the stove.Thus ensure that the temperature of the various piece on silicon steel strand is identical, avoid because silicon steel inside has temperature head silicon steel due to the different generation stress of inside and outside deflection from outside.
Therefore by non orientating silicon steel heating means of the present invention, the heating of walking beam furnace to silicon steel can be realized, thus avoid the heating process in order to realize silicon steel, reconstruct process furnace.Shorten the construction cycle, save operation cost; Achieve the multi-use of walking beam furnace simultaneously; Reduce cost, improve production efficiency.
In order to ensure the accuracy of other heating parameters of silicon steel strand in the process of carrying out soaking in walking beam furnace except heating temperatures parameter.In step 5) in further comprising the steps of: by oxygen level in the residual oxygen detection in walking beam furnace the burner hearth to schedule burner hearth that arrives of interval measurement, regulate air intake in real time, guarantee that Control for Oxygen Content is 2 ~ 6%; The real data of pressure in the burner hearth is measured by pressure detecting instrument; Then regulate the pressure in burner hearth by pressure regulating device, guarantee that furnace pressure is 1 ~ 10Pa.By detecting in real time at interval to schedule the oxygen level in burner hearth, thus the oxygen level in burner hearth can be learnt; The data that timely follow-up detects regulate air output.Avoid burner hearth due to the not enough oxygen level of air intake too low, cause soaking temperature too low, or due to ventilation excess of oxygen too high levels, cause surface of silicon steel to be oxidized and the situation such as process furnace heat losses.Control for Oxygen Content in process furnace is the oxygen level parameter meeting silicon steel heat regulation formulated voluntarily according to the different walking beam furnace of each factory self 2 ~ 6%.Control for Oxygen Content can be reduced heat losses 2 ~ 6%, ensure soaking temperature simultaneously, avoid surface of silicon steel over oxidation.Simultaneously by the detection to pressure in the burner hearth, control furnace pressure is 1 ~ 10Pa; Guarantee that heating process normally carries out.Pressurize parameter furnace pressure is 1 ~ 10Pa is known parameters conventional in silicon steel heating process.
In order to improve the heating efficiency of silicon steel.Step 6) mid-early stage enters silicon steel strand soaking more than 30 minutes in soaking zone of walking beam furnace soaking zone, and the later stage enters silicon steel strand soaking more than 40 minutes in soaking zone of walking beam furnace soaking zone.Its thermal uniformity of silicon steel strand entering walking beam furnace soaking zone due to early stage is better, can in the very fast effect reaching soaking of soaking zone, and therefore soaking time can make the temperature of various piece on silicon steel strand be soaking temperature at 30 minutes.But the later stage enters the silicon steel strand of walking beam furnace soaking zone, due to the soaking chance that the slab entering soaking zone early stage has a closedown fire door no longer to tap, what the later stage entered does not then have this chance, continuous switch fire door causes the equal thermal effect of temperature fluctuation bad, therefore need to slow down tapping interval, satisfied equal thermal effect is carried out, so soaking time is more than 40 minutes by extending soaking time.The silicon steel strand entering walking beam furnace soaking zone described early stage refers to: the silicon steel strand advancing into process furnace of not tapping at process furnace; The silicon steel strand that the described later stage enters walking beam furnace soaking zone refers to: just enter into the silicon steel strand in process furnace after process furnace first time tapping.
Invention also improves a kind of modelling control method realizing the non orientating silicon steel heating means of non orientating silicon steel heating means Automated condtrol.
The modelling control method of described non orientating silicon steel heating means comprises the following steps:
A, by step 1) in each silicon steel control interval heating parameters of obtaining set up Temperature Control Model, and be stored in the storer on the PLC of process automation; The Heating temperature adjusting deviation corresponding with difference between Heating temperature according to the actual temperature in heating zone burner hearth sets up temperature difference Controlling model; And be stored in the storer on the PLC of process automation; Require to set up constant temperature model according to the uniform heating process of silicon steel strand, constant temperature model is stored in the storer on the PLC of process automation; One is arranged for selecting the selector switch of heating parameters Controlling model, constant temperature selector switch and a comparer compared for heating zone burner hearth actual temperature and silicon steel Heating temperature in the PLC of process automation;
B, step 2) in PLC according to the degree of silicon (Si) in silicon steel strand in walking beam furnace by silicon steel Heating temperature T corresponding to silicon steel strand in selector switch selective temperature Controlling model; Heating temperature T is sent to the temperature of the temperature-control device control heating zone of process furnace heating zone by PLC;
C, by step 3) in adopt the process temperature check processing method of walking beam furnace heating low-temperature steel to detect the actual temperature Ta of district's burner hearth and the actual temperature Tb of heating zone inferior segment burner hearth in the heating zone that obtains to be sent to the PLC of process automation by transmitter; Be stored in the storer in PLC;
D, PLC are compared the actual temperature Ta of district's burner hearth in heating zone and Heating temperature T by comparer; Corresponding upper district Heating temperature adjusting deviation Δ T1 is selected by temperature difference selector switch according to comparative result; Control the actual temperature of district's burner hearth in heating zone;
PLC is compared the actual temperature Tb of heating zone inferior segment burner hearth and Heating temperature T by comparer; According to comparative result; Corresponding inferior segment Heating temperature adjusting deviation Δ T2 is selected by temperature difference selector switch; Control the actual temperature of heating zone inferior segment burner hearth;
E, enter time of soaking zone according to silicon steel strand, by the soaking of the constant temperature model cootrol walking beam furnace soaking zone silicon steel strand in constant temperature selector switch word-select memory.
The automatic control of non orientating silicon steel heating means can be realized by the modelling control method of above-mentioned non orientating silicon steel heating means, realize silicon steel strand and carry out all heat treated Automated condtrol at soaking zone, thus can enhance productivity, reduce production cost, reduce labor strength.
Concrete, described Controlling model comprises Heating temperature, heat flow density, heat emissivity coefficient, the shortest time inside furnace.
Concrete, described constant temperature model comprises thermostat temperature, constant temperature time.
In order to realize the automatic alarm of parameters in silicon steel heat-processed, the PLC of process automation arranges parameter comparer and a warning device for reporting to the police that a processing parameter required for actual process parameter in silicon steel heat-processed and silicon steel heating process compares; State modulator model is set up according to the oxygen level in the burner hearth that silicon steel heating process requires, furnace pressure; By state modulator model storage in the storer of the PLC of process automation;
By by oxygen level in the residual oxygen detection in walking beam furnace the burner hearth to schedule burner hearth that arrives of interval measurement, measured the real data of pressure in the burner hearth by pressure detecting instrument; The real data of described oxygen level and pressure in the burner hearth is sent to the PLC of process automation by transmitter;
By the comparer on PLC, the oxygen level in the oxygen level obtained and state modulator model is compared; When exceeding the oxygen level scope in state modulator model when step oxygen level; PLC controls warning device and reports to the police; When not exceeding the oxygen level scope in state modulator model when oxygen level, warning howler is not reported to the police;
By comparer, the furnace pressure in the real data of furnace pressure and state modulator model is compared; When exceeding the furnace pressure scope in state modulator model when furnace pressure; PLC controls warning device and reports to the police; When not exceeding the furnace pressure scope in state modulator model when furnace pressure; Warning howler is not reported to the police.
Embodiment 1:
Certain enterprise uses the present invention to improve non orientating silicon steel heating and production and process, and before using the present invention, the primitive economy technical parameter changing enterprise is as follows:
The invention process process is as follows:
(1) silicon steel heating process system is formulated as shown in table 1.
Table 1
(2) according to silicone content, determine the control interval of mathematical model, the data being convenient to transfer in silicon steel combustion control processes model cootrol are as shown in table 2.
Table 2
| Silicone content (%) | Control interval | Heating zone Heating temperature | The shortest time inside furnace |
| 1.5～2.0 | SI_ZONE1 | 1150℃ | 50min |
Continued 2
| 2.0～2.5 | SI_ZONE2 | 1160℃ | 60min |
| 2.5～3.0 | SI_ZONE3 | 1170℃ | 70min |
(3) in silicon steel MATHEMATICAL MODEL OF COMBUSTION, set up silicon steel Combustion System model, according to heating zone Heating temperature, set up the main control parameters that model needs, such as: heat flow density rat1, heat emissivity coefficient rat2, the shortest time inside furnace length in_t imed.Each process furnace is under the Heating temperature of correspondence, and its heat flow density rat1, heat emissivity coefficient rat2 are all not identical, according to the practical condition of each producer, will formulate corresponding heating parameters voluntarily.
(4) obtain the temperature in walking beam heating furnace about each section by basic automatization, its temperature compares regulation rule as table 3.
Table 3
(5) Temperature Control Model set up in (1), (2) and (3) is stored in the storer on the PLC of process automation; Simultaneously by temperature difference Controlling model that Heating temperature adjusting deviation corresponding with difference between Heating temperature for the actual temperature in the heating zone burner hearth obtained in (4) is set up; Be stored in the storer on the PLC of process automation; Require to set up constant temperature model according to the uniform heating process of silicon steel strand, constant temperature model is stored in the storer on the PLC of process automation; One is arranged for selecting the selector switch of heating parameters Controlling model, constant temperature selector switch and a comparer compared for heating zone burner hearth actual temperature and silicon steel Heating temperature in the PLC of process automation.
(6) according to heat-processed Controlling System to judge whether to have in current common walking beam heating furnace in table 1 the silicon steel trade mark that describes, if there is PLC then to transfer executing rule, using silicon steel process as the Combustion System rule in current control section.
(7) heating process that silicon steel model takes out current silicon steel from background data base requires temperature; Detect simultaneously and obtain actual temperature (fire box temperature), the deviation delta T of model automatic decision fire box temperature (actual temperature) and processing requirement temperature, and this deviation delta T value is sent to basic automatization by back-end data access platform, after basic automatization background system receives information, this information is sent to combustion control system, combustion control system, then according to the design temperature from process automation mathematical model, regulates coal gas and air stoichiometry to carry out temperature regulable control.Such as go up the actual temperature Ta of district's burner hearth and the Heating temperature T deviation of upper district burner hearth is 35 DEG C, then Δ T1=10 DEG C; The actual temperature Ta of inferior segment burner hearth and the Heating temperature T deviation of inferior segment burner hearth are 25, then Δ T2=5 DEG C.
The silicon steel of PLC control simultaneously strand is in the heat-up time of heating zone; Silicon steel strand enters into soaking zone after heating zone has heated.
(8) PLC selects corresponding soaking temperature to control the temperature of soaking zone according to the model of silicon steel strand by constant temperature selector switch; Control the soaking time of silicon steel at soaking zone simultaneously.The control temperature of soaking zone is target temperature ± 5 DEG C according to soaking temperature.After silicon steel enters soaking zone, its control law is according to carrying out as follows:
1. detect oxygen level in stove by the oxygen probe in stepping beam type, regulate oxygen level in real time, guarantee to control 2 ~ 6%.
2. detect furnace pressure by the pressure detecting instrument in stepping beam type, and regulate the flue shutter of air capacity and process furnace in real time, guarantee that furnace pressure controls at 1 ~ 10Pa.
3. calculated the time inside furnace of silicon steel by silicon steel Combustion System model, guarantee that early stage entered the blank plates of silicon steels time inside furnace of soaking zone more than 30 minutes, the blank plates of silicon steels time inside furnace that the later stage enters is more than 40 minutes; Come out of the stove after silicon steel soaking completes.
This enterprise is practiced by of the present invention, and larger change occurs silicon steel economic technology parameter, and after implementing the present invention, silicon steel primitive economy technical parameter is as follows:
Then year create benefit as follows:
(1) output increases the economic benefit produced
Silicon steel ton steel wound effect 400-800 yuan/ton, on average according to 600 yuan/ton of calculating, this patent contribution degree is according to 0.65, then creating benefit year is: 600*3*0.65=1170 ten thousand yuan.
(2) oxidization burning loss reduces the economic benefit produced is 4,000,000 yuan; Total economic benefit is: 1,170,+40,0=1,570 ten thousand yuan.
By non orientating silicon steel heating means of the present invention and the enforcement in the above-described embodiments of modelling control method thereof; By non orientating silicon steel heating means of the present invention, achieve the heating of walking beam furnace to silicon steel, thus avoid the heating process in order to realize silicon steel, reconstruct process furnace; Shorten the construction cycle, save operation cost; Achieve the multi-use of walking beam furnace simultaneously; Reduce cost, improve production efficiency.The automatic control of non orientating silicon steel heating means can be realized by the modelling control method of above-mentioned non orientating silicon steel heating means, realize silicon steel strand and carry out all heat treated Automated condtrol at soaking zone, thus can enhance productivity, reduce production cost, reduce labor strength.
Claims (7)
1. non orientating silicon steel heating means, is characterized in that: adopt walking beam furnace heating, comprise the following steps successively:
1) scope of the weight percent content of silicon in silicon steel (Si) is divided into multiple control interval; According to the heating requirements of silicon steel at each control interval; Determine the heating parameters of silicon steel in each silicon steel control interval; Determine the Heating temperature adjusting deviation Δ T that actual temperature in heating zone burner hearth is corresponding with difference between Heating temperature; The stove preheating section that silicon steel strand enters stepped heating carries out preheating; Until silicon steel strand temperature is 500 ~ 650 DEG C;
2) the silicon steel strand after preheating enters walking beam furnace heating zone, according to the degree determination silicon steel control interval of silicon (Si) in silicon steel strand in walking beam furnace; The silicon steel Heating temperature T corresponding according to the silicon steel control interval determined controls the temperature of process furnace heating zone;
3) silicon steel strand enters in walking beam furnace heating zone process, adopts the process temperature check processing method of walking beam furnace heating low-temperature steel to detect the actual temperature Ta of district's burner hearth and the actual temperature Tb of heating zone inferior segment burner hearth in walking beam furnace heating zone;
4) according to step 3) in obtain process furnace heating zone on the actual temperature Ta of district's burner hearth and the actual temperature Tb of heating zone inferior segment burner hearth compare separately with silicon steel Heating temperature T respectively;
According to the actual temperature Ta of district's burner hearth in heating zone and the comparative result of Heating temperature T; Determine upper district Heating temperature adjusting deviation Δ T1; The Heating temperature regulating district's burner hearth in heating zone is T+ Δ T1;
According to the actual temperature Tb of heating zone inferior segment burner hearth and the comparative result of Heating temperature T; Determine inferior segment Heating temperature adjusting deviation Δ T2; The Heating temperature regulating heating zone inferior segment burner hearth is T+ Δ T2;
5) silicon steel strand is heated to target temperature 1150 ~ 1180 DEG C in heating zone, enters into walking beam furnace soaking zone, regulates the temperature-control device of soaking zone, makes the soaking temperature of soaking zone be target temperature ± 5 DEG C;
6) silicon steel strand is soaked to each several part temperature on silicon steel strand in soaking zone is soaking temperature, then comes out of the stove.
2. non orientating silicon steel heating means as claimed in claim 1, is characterized in that: in step 5) in further comprising the steps of: regulate air intake, guarantee that Control for Oxygen Content is 2 ~ 6%; Regulate the pressure in burner hearth, guarantee that furnace pressure is 1 ~ 10Pa.
3. non orientating silicon steel heating means as claimed in claim 1, it is characterized in that: step 6) mid-early stage enters silicon steel strand soaking more than 30 minutes in soaking zone of walking beam furnace soaking zone, and the later stage enters silicon steel strand soaking more than 40 minutes in soaking zone of walking beam furnace soaking zone.
4. realize the modelling control method of the non orientating silicon steel heating means of non orientating silicon steel heating means Automated condtrol as claimed in claim 1, it is characterized in that comprising the following steps:
A, by step 1) in each silicon steel control interval heating parameters of obtaining set up Temperature Control Model, and be stored in the storer on the PLC of process automation; The Heating temperature adjusting deviation corresponding with difference between Heating temperature according to the actual temperature in heating zone burner hearth sets up temperature difference Controlling model; And be stored in the storer on the PLC of process automation; Require to set up constant temperature model according to the uniform heating process of silicon steel strand, constant temperature model is stored in the storer on the PLC of process automation; One is arranged for selecting the selector switch of heating parameters Controlling model, constant temperature selector switch and a comparer compared for heating zone burner hearth actual temperature and silicon steel Heating temperature in the PLC of process automation;
B, step 2) in PLC according to the degree of silicon (Si) in silicon steel strand in walking beam furnace by silicon steel Heating temperature T corresponding to silicon steel strand in selector switch selective temperature Controlling model; Heating temperature T is sent to the temperature of the temperature-control device control heating zone of process furnace heating zone by PLC;
C, by step 3) in adopt the process temperature check processing method of walking beam furnace heating low-temperature steel to detect the actual temperature Ta of district's burner hearth and the actual temperature Tb of heating zone inferior segment burner hearth in the heating zone that obtains to be sent to the PLC of process automation by transmitter; Be stored in the storer in PLC;
D, PLC are compared the actual temperature Ta of district's burner hearth in heating zone and Heating temperature T by comparer; Corresponding upper district Heating temperature adjusting deviation Δ T1 is selected by temperature difference selector switch according to comparative result; Control the actual temperature of district's burner hearth in heating zone;
PLC is compared the actual temperature Tb of heating zone inferior segment burner hearth and Heating temperature T by comparer; According to comparative result; Corresponding inferior segment Heating temperature adjusting deviation Δ T2 is selected by temperature difference selector switch; Control the actual temperature of heating zone inferior segment burner hearth;
E, enter time of soaking zone according to silicon steel strand, by the soaking of the constant temperature model cootrol walking beam furnace soaking zone silicon steel strand in constant temperature selector switch word-select memory.
5. the modelling control method of non orientating silicon steel heating means as claimed in claim 4, is characterized in that: described Controlling model comprises Heating temperature, heat flow density, heat emissivity coefficient, the shortest time inside furnace.
6. the modelling control method of non orientating silicon steel heating means as claimed in claim 4, is characterized in that: described constant temperature model comprises thermostat temperature, constant temperature time.
7. the modelling control method of non orientating silicon steel heating means as claimed in claim 4, is characterized in that: on the PLC of process automation, arrange parameter comparer and a warning device for reporting to the police that a processing parameter required for actual process parameter in silicon steel heat-processed and silicon steel heating process compares; State modulator model is set up according to the oxygen level in the burner hearth that silicon steel heating process requires, furnace pressure; By state modulator model storage in the storer of the PLC of process automation;
By by oxygen level in the residual oxygen detection in walking beam furnace the burner hearth to schedule burner hearth that arrives of interval measurement, measured the real data of pressure in the burner hearth by pressure detecting instrument; The real data of described oxygen level and pressure in the burner hearth is sent to the PLC of process automation by transmitter;
By the comparer on PLC, the oxygen level in the oxygen level obtained and state modulator model is compared; When exceeding the oxygen level scope in state modulator model when step oxygen level; PLC controls warning device and reports to the police; When not exceeding the oxygen level scope in state modulator model when oxygen level, warning howler is not reported to the police;
By comparer, the furnace pressure in the real data of furnace pressure and state modulator model is compared; When exceeding the furnace pressure scope in state modulator model when furnace pressure; PLC controls warning device and reports to the police; When not exceeding the furnace pressure scope in state modulator model when furnace pressure; Warning howler is not reported to the police.
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