CN104049649A - Model control method of heating furnace temperature - Google Patents
Model control method of heating furnace temperature Download PDFInfo
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- CN104049649A CN104049649A CN201310081313.XA CN201310081313A CN104049649A CN 104049649 A CN104049649 A CN 104049649A CN 201310081313 A CN201310081313 A CN 201310081313A CN 104049649 A CN104049649 A CN 104049649A
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Abstract
The invention relates to the metallurgy production field, especially to a heating furnace temperature control method and particularly to a model control method of a heating furnace temperature. According to the method, on the basis of actual production performance data, a gas statistics sample of each product in a heating furnace under the stable production rhythm is established; a furnace temperature linear distribution curve and a product temperature tracking model are established and on the basis of combination of a heating furnace parameter and the product type in the furnace, a furnace temperature initial setting value of a certain control segment is obtained; a gas flow standard value and a gas flow calculation value of the control segment are obtained by calculation and are combined and compared with an actual gas flow measuring value of the control segment to obtain a temperature correction adjusting factor of the control segment; and the temperature correction adjusting factor is used for carrying out calculation to obtain a final furnace temperature setting value of the control segment. With the method, problems of furnace temperature measurement precision abnormity, product heating quality abnormity, and energy wasting and the like due to thermal load changing of the heating furnace can be effectively solved; and the implementation of the method is the specific embodiment of the refined controlling of industrial production and environmental management.
Description
Technical field
The present invention relates to production field of metallurgy, relate in particular to a kind of temperature control method for heating furnace.
Background technology
Burning control in heating furnace, is finally to realize the reasonable distribution of gas flow in each control section, determines that the thermal load of each control section meets the requirement of control of industrial furnace home.In the heating furnace process control day by day improving in automaticity, the general automatic adjusting that all realizes gas flow by controlling furnace temperature.Along with product specification is expanded, market increases day by day to the requirement of product quality, and the Precise control of heating furnace production run is had higher requirement.Because of the impact of the factors such as furnace apparatus characteristic, method for controlling combustion, when product specification is many, rhythm of production is while changing, in stove, the variation of thermal load may affect the measurement of furnace temperature precision of heating furnace, make it not go out the actual working of a furnace by accurate response, cause the actual tapping temperature fluctuation of product, affect product quality, cause energy dissipation.
Exactly because the variation of product specification, the phenomenon that the interior different product of heating furnace loads in mixture heating is more and more general.Therefore, by temperature information and flow information are organically combined, realize furnace temperature Precise control under different thermal loads, to improving the quality of products, it is very significant saving the energy.Regrettably, the furnace temperature of heating furnace is controlled automatically at present, is benchmark mainly with single factors, only controls according to product temperature inverse furnace temperature, do not consider to measure gas flow, the problems such as the measurement of furnace temperature precision that causes is abnormal, control of industrial furnace home abnormal, energy dissipation.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of model control method of furnace temp, this control method combines temperature information in stove and gas flow information, can effectively alleviate and change the problems such as the measurement of furnace temperature precision causing is abnormal, control of industrial furnace home abnormal, energy dissipation because of heating furnace thermal load.
The present invention is achieved in that a kind of model control method of furnace temp, comprise the following steps: first taking production actual achievement data as basis, set up the combustion gas statistical sample under each single product steady production rhythm in heating furnace, product index is corresponding to characterize the best working of a furnace in actual production process one by one with combustion gas statistical sample; Then taking each control section actual measurement furnace temperature in heating furnace as basis, set up the furnace temperature linear distribution curve of heating furnace length direction, and utilize the interior product type of product temperature trace model, heater parameters and stove in stove to obtain a certain control section furnace temperature initial set value; Call corresponding combustion gas statistical sample and calculate in conjunction with product temperature trace model in stove again gas flow standard value and the gas flow calculating value of this control section according to the product index in this control section; Gas flow standard value and gas flow calculating value are combined with the gas flow measured value of this control section the temperature correction regulatory factor that obtains this control section is relatively set, finally utilize correlation parameter in temperature correction regulatory factor and stove to calculate this control section furnace temperature modified value, melted down to warm initial set value and obtain the final setting value of furnace temperature of this control section furnace temperature modified value generation.
Taking production actual achievement data as basis, set up the combustion gas statistical sample under single product steady production rhythm in heating furnace, combustion gas statistical sample comprises that index is the necessary gas flow of product correspondence in j control section of i
, section last target temperature
, output
, actual measurement gas flow
, combustion gas utilization factor
, wherein product index i is concrete steel grade, concrete unique index corresponding to specification;
In formula:
for the index single product that is i is under steady production state, j control section temperature in is to the mean specific heat between export goal temperature;
for the index single product that is i is under steady production state, the temperature difference of j control section section end target temperature and control section temperature in;
for fuel gases calorific value;
for the index single product that is i hourly output in each control section under steady production state;
。
Describedly call according to the product index in this control section gas flow standard value and the gas flow calculating value that corresponding combustion gas statistical sample calculates this control section in conjunction with product temperature trace model in stove and be specially,
,
,
under current production status, the gas flow standard value that j control section is required,
under current production status, the gas flow calculating value that j control section is required;
In formula:
under current production status, the product that index is i is in j control section, the corresponding required gas flow standard value of hourly output;
under current production status, product index i is in the hourly output of j control section;
for the index single product that is i hourly output in each control section under steady production state;
for the index single product that is i actual measurement gas flow in j control section under steady production state;
In formula:
under current production status, product index i is in the hourly output of j control section;
for the index single product that is i is under steady production state, in j control section temperature in to the mean specific heat between export goal temperature;
for the index single product that is i is under steady production state, in the combustion gas utilization factor of j control section;
under current production status, the product that index is i is in the temperature difference of j control section section end target temperature and control section temperature in;
for fuel gases calorific value.
The temperature correction regulatory factor that described setting obtains this control section is specially, and first, sets the flow adjustment of j control section
with fluctuations in discharge trend regulatory factor
scope; Standard gas flow deviate
, calculate gas flow deviate
, variation tendency value
, wherein
under current production status, the actual measurement gas-flow value of j control section,
under current production status, the actual measurement gas-flow value of a upper Measuring Time; Then, according to
,
with
numerical relation set scope in rule of thumb choose flow adjustment
with fluctuations in discharge trend regulatory factor
numerical value, finally obtain the temperature correction regulatory factor of j control section under current production status
.
Describedly utilize in temperature correction regulatory factor and stove correlation parameter to calculate this control section furnace temperature modified value to be specially
In formula:
under current production status, the combustion gas comprehensive utilization ratio of j control section;
for air-fuel ratio;
under current production status, in j control section, remove other thermal loss outside flue gas and product absorption heat;
for flue gas generates coefficient;
under current production status, flue gas specific heat corresponding to thermocouple measuring temperature in j control section;
for fuel gases calorific value;
under current production status, j control section standard gas flow deviate;
for temperature correction regulatory factor;
under current production status, the actual measurement gas-flow value of j control section.
The model control method of furnace temp of the present invention is in the time carrying out Control for Kiln Temperature, temperature information in stove and gas flow information are combined, can effectively alleviate and change the problems such as the measurement of furnace temperature precision causing is abnormal, control of industrial furnace home abnormal, energy dissipation because of heating furnace thermal load, be a kind of imbody of commercial production Precise control, Environment Management; Be particularly suitable for that product specification is many, rhythm of production changes fast heating furnace.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's statement, these equivalent form of values fall within the application's appended claims limited range equally.
Embodiment 1
A model control method for furnace temp, comprises the following steps:
Step 1, first taking production actual achievement data as basis, set up the combustion gas statistical sample under each single product steady production rhythm in heating furnace, product index is corresponding to the best working of a furnace in sign actual production process one by one with combustion gas statistical sample; The contents are as follows:
Single product steady production rhythm: steel grade and the specification of carrying out heating products in heating furnace are just the same, and product index is i, and heating furnace take out steel even pace, concrete steel grade, concrete unique index corresponding to specification;
index be the single product of i under steady production state, product arrives the actual achievement temperature at j control section section end, this temperature follows the tracks of to obtain by product temperature in stove;
index be the single product of i under steady production state, in the necessary gas flow of j control section, the absorb gas flow that heat is corresponding heats up;
, in formula:
for the index single product that is i is under steady production state, j control section temperature in is to the mean specific heat between export goal temperature;
for the index single product that is i is under steady production state, the temperature difference of j control section section end target temperature and control section temperature in;
for fuel gases calorific value;
for the index single product that is i under steady production state in the hourly output of each control section, under single product steady production state, the hourly output of each control section equates,
, wherein:
be product weight in j control section,
be the length of j control section, v is stepping rate; For steady production rhythm, in stove, be uniform distribution,
constant, so the hourly output of each control section equates;
for the index single product that is i combustion gas utilization factor in j control section under steady production state,
, wherein:
for the index single product that is i is under steady production state, in the actual measurement gas flow of j control section.
Step 2, then taking each control section actual measurement furnace temperature in heating furnace as basis, set up the furnace temperature linear distribution curve of heating furnace length direction; In production scene, according to the physical size of product, can adopt the discrete differential method of 1 dimension or 2 dimensions to carry out solving of heat-conduction equation.Like this, in conjunction with furnace apparatus layout, taking each control section actual measurement furnace temperature in stove as basis, can set up the furnace temperature linear distribution curve of heating furnace length direction; Taking product heat-conduction equation as basis, by discrete differential equation corresponding to heat-conduction equation carried out to iterative, realize product temperature in stove and follow the tracks of, calculate j control section furnace temperature initial set value by industrial control computer according to the necessary furnace temperature of different product in control section
, this is ripe prior art.
Step 3, combination product temperature trace information again, calculate gas flow standard value and the gas flow calculating value of each control section under the current production status of heating furnace; First calculate under current production status, product index i is in the hourly output of j control section
,
, wherein:
under current production status, the product that index is i j control section product weight; Then calculate, under current production status, the gas flow standard value that j control section is required
under current production status, the gas flow calculating value that j control section is required
; Finally calculate the combustion gas comprehensive utilization ratio of j control section under current production status
,
;
In formula:
under current production status, the product that index is i is in j control section, the corresponding required gas flow standard value of hourly output;
for the index single product that is i actual measurement gas flow in j control section under steady production state;
In formula:
under current production status, product index i is in the hourly output of j control section;
for the index single product that is i is under steady production state, in j control section temperature in to the mean specific heat between export goal temperature;
under current production status, the product that index is i is in the temperature difference of j control section section end target temperature and control section temperature in;
for fuel gases calorific value.
Step 4, in addition gas flow standard value and gas flow calculating value are combined to comparison with the gas flow measured value of this control section, carry out state judgement, then according to comparative result, setting obtains the temperature correction regulatory factor of this control section, in order to realize the differential adjusting to furnace temperature of gas flow under different conditions; First, set the flow adjustment of j control section
with fluctuations in discharge trend regulatory factor
scope, for example desirable
,
; Standard gas flow deviate
, calculate gas flow deviate
, variation tendency value
, wherein
under current production status, the actual measurement gas-flow value of j control section,
under current production status, the actual measurement gas-flow value of a upper Measuring Time; Then, according to
,
with
numerical relation set scope in rule of thumb choose flow adjustment
with fluctuations in discharge trend regulatory factor
concrete numerical value; Finally obtain the temperature correction regulatory factor of j control section under current production status
.
If
with
jack per line, is just being all or is being all negative, illustrates that the working of a furnace similarity that product temperature trace information and gas flow information characterizes is high, now flow adjustment
can in the scope of setting, choose and get higher value; Otherwise, flow adjustment
get smaller value.
Utilize
with
relation, in the scope of setting, choose the occurrence of fluctuations in discharge trend regulatory factor, as follows:
| ? | ||
| A | B | |
| C | D |
A: current actual gas flow is bigger than normal, and actual gas flow is increase trend, and fluctuations in discharge trend regulatory factor is got higher value;
B: current actual gas flow is less than normal, and actual gas flow is increase trend, and fluctuations in discharge trend regulatory factor is got smaller value;
C: current actual gas flow is bigger than normal, and actual gas flow is and reduces trend, and fluctuations in discharge trend regulatory factor is got smaller value;
D: current actual gas flow is less than normal, and actual gas flow is and reduces trend, and fluctuations in discharge trend regulatory factor is got higher value;
Step 5, finally utilize correlation parameter in temperature correction regulatory factor and stove to calculate this control section furnace temperature modified value, melted down to warm initial set value and obtain the final setting value of furnace temperature of this control section furnace temperature modified value generation, the final setting value of furnace temperature of j control section
specifically be calculated as follows:
=
-
Wherein,
In formula:
it is the furnace temperature modified value of j control section;
It is the furnace temperature initial set value of j control section;
for air-fuel ratio;
under current production status, in j control section, remove other thermal loss outside flue gas and product absorption heat; Regulate for convenient, be set in an embodiment 0, then all by regulating
characterize;
for flue gas generates coefficient, can characterize with the exhaust gas volumn of actual measurement and the ratio that drops into air, gas quantity sum, also can calculate according to air and gas component;
under current production status, flue gas specific heat corresponding to thermocouple measuring temperature in j control section.
Taking certain heating furnace of our factory's practical application as example, this heating furnace effective furnace length 46m, is divided into 5 sections of stove rear, preheating section, the section of adding, two sections of adding, soaking zones etc., wherein 4 sections of preheating section, the section of adding, two sections of adding, soaking zones etc. are control section, and corresponding j is 1,2 respectively, 3,4; Combustion gas adopts mixed gas, and calorific value is 2120kcal/m
3, air-fuel ratio
be 2.18; Flue gas generates coefficient
be 0.948; Suppose to comprise 2 kinds when heating steel grade in forehearth, two product manipulative indexings are respectively 1,2, and in stove, product substance is consistent with distributing mode, and tapping temperature is 1200 DEG C; Stove rear to section of adding middle part is the product of index 2, and the section of an adding middle part is the product of index 1 to soaking zone; Current stepping rate v is 19.82m/h.
Under current production status, the following table 1 of each control section actual measurement gas-flow value:
| Control section | 1 | 2 | 3 | 4 |
| (m 3/h) | 10350 | 13600 | 7610 | 1218 |
| (m 3/h) | 10300 | 12950 | 7600 | 1250 |
Table 1
Under current production status, follow the tracks of according to product temperature in stove, obtain different product as shown in table 2 in each control section temperature in:
Table 2
Each control section furnace temperature initial set value that Industry Control is set
, as shown in table 3 below:
| Control section j | 1 | 2 | 3 | 4 |
| Set furnace temperature T (j) | 1005℃ | 1190℃ | 1250℃ | 1210℃ |
Table 3
Under single product steady production rhythm, index is that 1,2 hourly output corresponding to product is respectively 280 tons, 250 tons, corresponding stepping rate v is respectively 19.82m/h, 17.69m/h, temperature when No. 1 control section of product introduction is 450 DEG C, foundation combustion gas sample statistics information as following table 4:
Table 4
Wherein, the single product that index is i is under steady production state, in the necessary gas flow of j control section
be calculated as follows:
Under the current production status of heating furnace, calculate the required gas flow standard value V of each control section
3and the required gas flow calculating value V of each control section (j)
4(j).
Under current production status, product substance is consistent with distributing mode, and therefore the hourly output of each control section equates, is 280 tons; Adopt formula:
Computation index be the product of i in j control section, corresponding hourly output
see the following form 5:
Table 5
Under current production status, the product that index is i is in j control section, the corresponding required gas flow standard value of hourly output
be calculated as follows:
The combustion gas comprehensive utilization ratio of j control section under current production status
be calculated as follows:
| Control section j | 1 | 2 | 3 | 4 |
| 0.6294 | 0.5160 | 0.5081 | 0.3523 |
Deduct each control section temperature in control section section end target temperature, can obtain as under current production status, the product that index is i is in the temperature difference of j control section section end target temperature and control section temperature in
; As follows:
Under current production status, the product that index is i is in j control section, the corresponding required gas flow calculating value of hourly output
be calculated as follows:
Under current production status, the gas flow calculating value that j control section is required:
State judges, determines the flow adjustment of each control section from two aspects
.
| j | 1 | 2 | 3 | 4 |
| 46 | -176 | 110 | 18 | |
| -366 | -103 | 194 | 77 | |
| 0.2 | 0.8 | 0.8 | 0.8 |
| j | 1 | 2 | 3 | 4 |
| 46 | -176 | 110 | 18 | |
| 50 | 640 | 10 | -32 | |
| 0.8 | 0.3 | 0.8 | 0.3 |
| j | 1 | 2 | 3 | 4 |
| 0.16 | 0.24 | 0.64 | 0.24 |
Utilize correlation parameter in temperature correction regulatory factor and stove to calculate this control section furnace temperature modified value
, be specifically calculated as follows:
By furnace temperature modified value
in generation, is returned control section furnace temperature initial set value
, obtain the final setting value of furnace temperature of this control section
=
-
Setting value rounds, and therefore obtains revised design temperature:
| Control section j | 1 | 2 | 3 | 4 |
| Initial set value | 1005℃ | 1190℃ | 1250℃ | 1210℃ |
| Final setting value | 1005℃ | 1193℃ | 1242℃ | 1206℃ |
Claims (5)
1. the model control method of a furnace temp, it is characterized in that, comprise the following steps: first taking production actual achievement data as basis, set up the combustion gas statistical sample under each single product steady production rhythm in heating furnace, product index is corresponding to characterize the best working of a furnace in actual production process one by one with combustion gas statistical sample; Then taking each control section actual measurement furnace temperature in heating furnace as basis, set up the furnace temperature linear distribution curve of heating furnace length direction, and utilize the interior product type of product temperature trace model, heater parameters and stove in stove to obtain a certain control section furnace temperature initial set value; Call corresponding combustion gas statistical sample and calculate in conjunction with product temperature trace model in stove again gas flow standard value and the gas flow calculating value of this control section according to the product index in this control section; Gas flow standard value and gas flow calculating value are combined with the gas flow measured value of this control section the temperature correction regulatory factor that obtains this control section is relatively set, finally utilize correlation parameter in temperature correction regulatory factor and stove to calculate this control section furnace temperature modified value, melted down to warm initial set value and obtain the final setting value of furnace temperature of this control section furnace temperature modified value generation.
2. the model control method of furnace temp as claimed in claim 1, it is characterized in that: taking production actual achievement data as basis, set up the combustion gas statistical sample under single product steady production rhythm in heating furnace, combustion gas statistical sample comprises that index is the necessary gas flow of product correspondence in j control section of i
, section last target temperature
, output
, actual measurement gas flow
, combustion gas utilization factor
, wherein product index i is concrete steel grade, concrete unique index corresponding to specification;
In formula:
for the index single product that is i is under steady production state, j control section temperature in is to the mean specific heat between export goal temperature;
for the index single product that is i is under steady production state, the temperature difference of j control section section end target temperature and control section temperature in;
for fuel gases calorific value;
for the index single product that is i hourly output in each control section under steady production state;
。
3. the model control method of furnace temp as claimed in claim 1, it is characterized in that: describedly call according to the product index in this control section gas flow standard value and the gas flow calculating value that corresponding combustion gas statistical sample calculates this control section in conjunction with product temperature trace model in stove and be specially
,
,
under current production status, the gas flow standard value that j control section is required,
under current production status, the gas flow calculating value that j control section is required;
In formula:
under current production status, the product that index is i is in j control section, the corresponding required gas flow standard value of hourly output;
under current production status, product index i is in the hourly output of j control section;
for the index single product that is i hourly output in control section under steady production state;
for the index single product that is i actual measurement gas flow in j control section under steady production state;
In formula:
under current production status, product index i is in the hourly output of j control section;
for the index single product that is i is under steady production state, in j control section temperature in to the mean specific heat between export goal temperature;
for the index single product that is i is under steady production state, in the combustion gas utilization factor of j control section;
under current production status, the product that index is i is in the temperature difference of j control section section end target temperature and control section temperature in;
for fuel gases calorific value.
4. the model control method of furnace temp as claimed in claim 3, is characterized in that: the temperature correction regulatory factor that described setting obtains this control section is specially, and first, sets the flow adjustment of j control section
with fluctuations in discharge trend regulatory factor
scope; Standard gas flow deviate
, calculate gas flow deviate
, variation tendency value
, wherein
under current production status, the actual measurement gas-flow value of j control section,
under current production status, the actual measurement gas-flow value of a upper Measuring Time; Then, according to
,
with
numerical relation set scope in rule of thumb choose flow adjustment
with fluctuations in discharge trend regulatory factor
numerical value, finally obtain the temperature correction regulatory factor of j control section under current production status
.
5. the model control method of furnace temp as claimed in claim 1, is characterized in that: describedly utilize in temperature correction regulatory factor and stove correlation parameter to calculate this control section furnace temperature modified value to be specially
In formula:
under current production status, the combustion gas comprehensive utilization ratio of j control section;
for air-fuel ratio;
under current production status, in j control section, remove other thermal loss outside flue gas and product absorption heat;
For flue gas generates coefficient;
under current production status, flue gas specific heat corresponding to thermocouple measuring temperature in j control section;
for fuel gases calorific value;
under current production status, j control section standard gas flow deviate;
for temperature correction regulatory factor;
under current production status, the actual measurement gas-flow value of j control section.
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| CN115101139A (en) * | 2022-07-27 | 2022-09-23 | 南京安佰思生物科技有限公司 | Synthesis process of hydroxy pinacolone retinoic acid ester |
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| CN104532212A (en) * | 2015-01-05 | 2015-04-22 | 上海微世半导体有限公司 | LPCVD initial-deposition furnace temperature accurate control method |
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| CN111950176A (en) * | 2020-07-13 | 2020-11-17 | 首钢集团有限公司 | Optimization method and optimization device for billet heating model and electronic equipment |
| CN115101139A (en) * | 2022-07-27 | 2022-09-23 | 南京安佰思生物科技有限公司 | Synthesis process of hydroxy pinacolone retinoic acid ester |
| CN115101139B (en) * | 2022-07-27 | 2023-09-15 | 南京安佰思生物科技有限公司 | Synthesis process of hydroxy pinacolone retinoic acid ester |
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