CN103697712A - Method for dynamically controlling furnace temperature of heating furnace based on time sensitivity - Google Patents
Method for dynamically controlling furnace temperature of heating furnace based on time sensitivity Download PDFInfo
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- CN103697712A CN103697712A CN201210373352.2A CN201210373352A CN103697712A CN 103697712 A CN103697712 A CN 103697712A CN 201210373352 A CN201210373352 A CN 201210373352A CN 103697712 A CN103697712 A CN 103697712A
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Abstract
The invention relates to a method for dynamically controlling the furnace temperature of a heating furnace based on time sensitivity. The method comprises the following steps: (1) dynamically calculating the minimum in-furnace time of a plate blank according to the in-furnace position and discharging rhythm of the plate blank, the heating capacity of the heating furnace and the movement information maximum value of a stepping beam; (2) retrieving the specific heat capacity of the heat conductivity of the plate blank according to the actual in-furnace temperature of the plate blank to obtain physical plate blank parameters corresponding to the actual temperature of the plate blank; (3) calculating average physical parameters of the plate blank in each section; (4) predicting the temperature of the plate blank reaching the section end, and calculating the furnace temperature sensitivity of the plate blank; (5) calculating the maximum temperature rise rate of the plate blank under the condition of different furnace temperatures according to the thermal expansion coefficient, stress and elastic modulus of the plate blank; (6) establishing an optimum furnace temperature setting target function, and then controlling the furnace temperature according to the optimum furnace temperature setting target function, wherein the constraint condition is an equivalence relation established according to the steps (4, 5 and 6). According to the method, the temperature rise rate of the furnace temperature can be dynamically controlled, so that over-heating or insufficient soaking of the plate blank is avoided.
Description
technical field:
The present invention relates to a kind of dynamic heat stove method for controlling furnace temperature based on time sensitivity, belong to metallurgical technology field.
background technology:
In prior art, adopted corresponding each steel grade set temperature calculating parameter, according to temperature computation setting parameter furnace temperature setting value, this scheme has following problem:
1. it is little that this scheme is only applicable to the variation of steel grade target temperature, continuously the steel rolling environment of operation; Large for steel grade object variations, occur that new steel grade, rolling environment change, while there is blowing out, situation to be rolled, this technical scheme is not owing to considering the time of staying of slab in stove, and its iron scale is all large than optimal case with the consumption of the energy, so its implementation result is unsatisfactory.
2. this technical scheme changes for section target temperature, and in the time of need to controlling each section, because section control target changes, and the setting of actual furnace temperature does not have corresponding adjustment, so its implementation result is undesirable.
3. this technical scheme, for special steel grade, need to be carried out different heating mode in different heating section, as is rapidly heated, can not be distinguished during the mode such as insulation, make slab have the shortcomings such as burning or soaking deficiency, so its implementation result is unsatisfactory.
Summary of the invention:
The object of the invention is provides a kind of dynamic heat stove method for controlling furnace temperature based on time sensitivity for the problem of above-mentioned existence, can control dynamically the heating rate of furnace temperature, avoids slab burning or soaking not enough.
Above-mentioned object realizes by following technical scheme:
Dynamic heat stove method for controlling furnace temperature based on time sensitivity, comprises the steps:
(1) according to slab position, the rhythm of coming out of the stove, heating furnace heating efficiency and its shortest time inside furnace of step rate mobile message maximum dynamic calculation in stove;
(2), according to slab actual temperature in stove, retrieval slab thermal conductivity specific heat capacity, utilizes linear interpolation algorithm to obtain the corresponding slab physical parameter of slab actual achievement temperature;
(3) according to the physical length of slab prediction the shortest time inside furnace, slab actual achievement temperature and each section of heating furnace, calculate slab average physical parameter in each section;
(4) temperature while arriving section end according to the shortest time inside furnace prediction of the average physical parameter of slab and residue slab, and computing board biscuit furnace warming degree;
(5) according to slab thermal coefficient of expansion, stress, calculate slab maximum heating rate in different furnace temperature situations from elastic modelling quantity;
(6) set up optimal furnace temperature target setting function, constraints is the equivalence relation of setting up according to step 4, step 5 and step 6, then according to optimal furnace temperature target setting function, carries out Control for Kiln Temperature.
The described dynamic heat stove method for controlling furnace temperature based on time sensitivity, in each section described in step (3), average physical parameter comprises that each section of avergae specific heat calculated and each section of evenly heat reception and registration rate calculated.
Beneficial effect:
The present invention is according to the shortest time inside furnace of maximum dynamic setting of the rhythm of coming out of the stove, heating furnace heating efficiency and step rate mobile message; During prediction slab tapping temperature, according to the shortest time inside furnace, and computing board biscuit furnace warming degree value, can directly obtain the analytic expression of slab tapping temperature predicted value, avoid iterative computation.Soaking temperature when guaranteeing that slab is come out of the stove, can pass through computing board biscuit furnace warming degree value, and a constraints using slab soaking restriction temperature as optimizing function realizes.For the dynamic heating rate of controlling furnace temperature, can be using the heating rate of slab and the constraints realization of the hot physical property performance of slab as optimizing function; In order to guarantee to calculate convergence rate and precision, the needs that meet online dynamic setting can iterative computation 2,3 times.
The specific embodiment:
Embodiment 1:
Step 1: slab is according to its position, the rhythm of coming out of the stove, heating furnace heating efficiency and its shortest time inside furnace of step rate mobile message maximum dynamic calculation in stove.
Step 2: according to slab actual achievement temperature in stove, retrieval slab thermal conductivity specific heat capacity, utilizes linear interpolation algorithm to obtain the corresponding slab physical parameter of slab actual achievement temperature.Its computational methods are as follows:
Each table is to carry out stepping according to steel grade and temperature (every 50 ℃).
Specific heat calculates:
Wherein,
: slab mean temperature (℃);
: avergae specific heat (Kcal/kg ℃);
: specific heat in table (Kcal/kg ℃);
: slab sign;
: specific heat layering level in table
The coefficient of heat conduction calculates
Wherein,
: slab mean temperature (℃);
: the evenly heat coefficient of conductivity (Kcal/mhr ℃);
: the coefficient of heat conduction in table (Kcal/mhr ℃);
: slab sign;
: specific heat layering level in table
Step 3: calculate slab average physical parameter in each section according to the physical length of slab prediction the shortest time inside furnace, slab actual achievement temperature and each section of heating furnace.
Each section of avergae specific heat calculated:
According to each section of entrance side/outlet side temperature, from the specific heat than retrieving hotlist, calculate avergae specific heat around here.
: each section of entrance side board briquette (during the section of slab place, being Current Temperatures),
K: each section of segment number.
While calculating for the second time, by last outlet side temperature of trying to achieve, calculate:
: each section of evenly heat reception and registration rate calculated.
When cause is calculated for the first time, outlet side board briquette does not also calculate, therefore board briquette
=
,
In formula:
: each section of entrance side board briquette (during the section of slab place, being Current Temperatures).
In formula:
: each section of evenly heat reception and registration rate,
While calculating for the second time, by the last outlet side temperature of calculating, ask each section of mean temperature and evenly heat reception and registration rate
Step 4: temperature while arriving section end according to the shortest time inside furnace prediction of the average physical parameter of slab and residue slab, and computing board biscuit furnace warming degree.
Wherein,
: each section of outlet side slab predicted temperature (℃);
: each section of prediction residue time inside furnace (hr);
: slab thickness (m)
Step 5: calculate slab maximum heating rate in different furnace temperature situations from elastic modelling quantity according to slab thermal coefficient of expansion, stress.
Wherein,
: heating rate;
: slab temperature diffusivity;
: allowable stress;
: metal linear expansion coefficient;
: elastic modelling quantity;
: METAL HEATING PROCESS depth of penetration heating.
Step 6: set up optimal furnace temperature target setting function, meeting under the prerequisite of heating of plate blank quality, heating furnace energy consumes best principle, its constraints is the equivalence relation of setting up according to step 4, step 5 and step 6.
: each section of necessary furnace temperature (℃);
: each section of necessary furnace temperature correction (℃);
: extraction target temperature (℃);
: the restriction value of the equal temperature of guaranteeing to come out of the stove (℃);
: the first bringing-up section and the second bringing-up section temperature inversion coefficient;
: preheating section and the first bringing-up section temperature inversion coefficient;
: stove rear and preheating section temperature inversion coefficient.Definite mode of temperature inversion coefficient wherein:
;
By the correction of the trying to achieve necessary furnace temperature that adds, if result of calculation can not meet the requirement of slab tapping temperature, then above formula calculates, and through iterating calculating, result converged in permissible variation.
Wherein,
: each section of necessary furnace temperature (℃);
: each section of necessary furnace temperature correction (℃);
: each section of segment number.
Application example:
Table 1 slab physical parameter table, corresponding physical parameter in the time of can retrieving this steel grade actual achievement temperature value by this table:
Steel grade | Temperature grade | Specific heat capacity | Thermal conductivity |
Mild steel | 50 | 0.116 | 55.3 |
Mild steel | 200 | 0.12 | 53.4 |
Mild steel | 350 | 0.124 | 52 |
… | … | … |
Table 2 slab radiation coefficient table, can retrieve this steel grade theory corresponding radiation coefficient during short time inside furnace by this table:
Steel grade grade | Theoretical residue time inside furnace | Radiation coefficient |
Mild steel | 120 | 0.6 |
Mild steel | 240 | 0.4 |
Medium carbon steel | 120 | 0.58 |
… | … | … |
Table 3 setting value table:
Heat (batch) number | Stove rear (on) | Stove rear (under) | Preheating section (on) | Preheating section (under) | Add 1 section (on) | Add 1 section (on) | … |
1 | 980 | 990 | 1120 | 1140 | 1200 | 1220 | … |
2 | 970 | 970 | 1130 | 1120 | 1220 | 1210 | … |
3 | 960 | 980 | 1180 | 1130 | 1220 | 1260 | … |
According to steel grade kind and the shortest time inside furnace of theory, determine slab radiation coefficient, substitution prediction board briquette formula calculates slab section end accounting temperature.
Illustrate: after the setting value of all sections has been calculated in stove, all setting values are saved in database setting value table (in Table 3), and are presented in L2 setting value supervisory frame.
Claims (2)
1. the dynamic heat stove method for controlling furnace temperature based on time sensitivity, is characterized in that: comprise the steps:
(1) according to slab position, the rhythm of coming out of the stove, heating furnace heating efficiency and its shortest time inside furnace of step rate mobile message maximum dynamic calculation in stove;
(2), according to slab actual temperature in stove, retrieval slab thermal conductivity specific heat capacity, utilizes linear interpolation algorithm to obtain the corresponding slab physical parameter of slab actual achievement temperature;
(3) according to the physical length of slab prediction the shortest time inside furnace, slab actual achievement temperature and each section of heating furnace, calculate slab average physical parameter in each section;
(4) temperature while arriving section end according to the shortest time inside furnace prediction of the average physical parameter of slab and residue slab, and computing board biscuit furnace warming degree;
(5) according to slab thermal coefficient of expansion, stress, calculate slab maximum heating rate in different furnace temperature situations from elastic modelling quantity;
(6) set up optimal furnace temperature target setting function, constraints is the equivalence relation of setting up according to step 4, step 5 and step 6, then according to optimal furnace temperature target setting function, carries out Control for Kiln Temperature.
2. the dynamic heat stove method for controlling furnace temperature based on time sensitivity according to claim 1, is characterized in that: in each section described in step (3), average physical parameter comprises that each section of avergae specific heat calculated and each section of evenly heat reception and registration rate calculated.
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105838869A (en) * | 2015-01-15 | 2016-08-10 | 宝山钢铁股份有限公司 | Steel plate quenching furnace heating process on-line adjustment method |
CN106191411A (en) * | 2015-04-29 | 2016-12-07 | 宝山钢铁股份有限公司 | A kind of time inside furnace control method for steel plate heat treatment |
CN106874591A (en) * | 2017-02-10 | 2017-06-20 | 中冶华天南京工程技术有限公司 | A kind of computational methods of square billet heating process temperature distribution |
CN106906351A (en) * | 2017-02-10 | 2017-06-30 | 中冶华天南京工程技术有限公司 | A kind of board briquette forecasting model and optimum furnace method |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105838869A (en) * | 2015-01-15 | 2016-08-10 | 宝山钢铁股份有限公司 | Steel plate quenching furnace heating process on-line adjustment method |
CN105838869B (en) * | 2015-01-15 | 2018-01-30 | 宝山钢铁股份有限公司 | A kind of steel plate quenching stove heat technique on-line tuning method |
CN106191411A (en) * | 2015-04-29 | 2016-12-07 | 宝山钢铁股份有限公司 | A kind of time inside furnace control method for steel plate heat treatment |
CN106191411B (en) * | 2015-04-29 | 2018-01-30 | 宝山钢铁股份有限公司 | A kind of time inside furnace control method for steel plate heat treatment |
CN106874591A (en) * | 2017-02-10 | 2017-06-20 | 中冶华天南京工程技术有限公司 | A kind of computational methods of square billet heating process temperature distribution |
CN106906351A (en) * | 2017-02-10 | 2017-06-30 | 中冶华天南京工程技术有限公司 | A kind of board briquette forecasting model and optimum furnace method |
CN106906351B (en) * | 2017-02-10 | 2019-04-12 | 中冶华天南京工程技术有限公司 | A kind of board briquette forecasting model and optimum furnace method |
CN106874591B (en) * | 2017-02-10 | 2019-12-03 | 中冶华天南京工程技术有限公司 | A kind of calculation method of square billet heating process temperature distribution |
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