CN114015860B - Method and system for controlling furnace temperature of double heat accumulating type heating furnace - Google Patents
Method and system for controlling furnace temperature of double heat accumulating type heating furnace Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 claims abstract description 54
- 230000001105 regulatory effect Effects 0.000 claims abstract description 23
- 230000001276 controlling effect Effects 0.000 claims abstract description 17
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 claims description 12
- 239000003034 coal gas Substances 0.000 claims description 7
- 230000001351 cycling effect Effects 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 claims description 4
- 230000001172 regenerating effect Effects 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 106
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 239000000446 fuel Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
Classifications
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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
- C21D1/52—Methods of heating with flames
-
- 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
-
- 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
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
Abstract
The invention provides a method and a system for controlling the furnace temperature of a double heat accumulating type heating furnace, comprising the following steps: and a combustion three-way valve adjusting step: controlling the start and stop of each section of combustion three-way valve of the heating furnace according to different gas pressure values; and a gas valve adjusting step: the increment value of the pressure is obtained by incremental calculation of the pressure, and the feedforward control quantity of the gas valve is obtained by accumulating three increments in adjacent time, so that the valve regulating quantity is controlled. The invention solves the problem that the existing temperature PID control method cannot timely stabilize the pressure of the gas in the heating furnace when the pressure fluctuation of the gas pipe network is large.
Description
Technical Field
The invention relates to a heating furnace temperature control method, in particular to a double heat accumulating type heating furnace temperature control method and system applied to a gas pipe network with large pressure fluctuation.
Background
The combustion temperature control system of the steel rolling heating furnace is one of important links in the steel rolling production process, and the accuracy of temperature control of the reaction furnace is improved through the temperature control system, so that the heating quality of blanks is improved, the temperature difference and uniformity of the heads and the tails of the blanks are accurately controlled, the energy consumption is reduced, and the method has important significance for energy conservation of steel enterprises. The reaction furnace comprises 4 physical sections of a preheating section, a first section, a second section and a soaking section, wherein the gas valve adjustment mode of each section is the same, the preheating section is used for preheating a feed steel billet, the first section and the second section are heating sections of the steel billet, the steel billet is heated to the required temperature, the heating time of the steel billet is prolonged by the soaking section, and the temperature difference between the inside and the outside of the steel billet is reduced.
In the Chinese patent document with publication number of CN103019097A, an optimized control system of a steel rolling heating furnace is disclosed, a furnace temperature online setter is established according to different billet types, the production rhythm, the initial temperature and the tapping temperature of the billet, and the tapping temperature of the billet is controlled by adopting a method for controlling the furnace temperature; based on thermal efficiency models under various working conditions, calculating the load variation of the heating furnace and taking the load variation as a furnace temperature feedforward value to realize high-precision control of the furnace temperature of the heating furnace under load fluctuation; on the basis, the optimal air-fuel ratio is found by establishing an air-fuel ratio optimizing control model. When the pressure fluctuation of the gas pipe network is large, the scheme can not adjust the pressure fluctuation in time, so that the fluctuation of the furnace temperature of the heating furnace is large, and the air-fuel ratio is out of balance.
In general, the temperature of the double heat accumulating type heating furnace is regulated by adopting a PID mode, and the opening degree of a valve is controlled through feedback of the actual temperature and the set temperature, so that the flow control air-fuel ratio of gas and air is determined. However, when the pressure fluctuation of the gas pipe network is large, the opening degree of the gas regulating valve can not determine the flow of the gas, and the actuating mechanism of the heating furnace is slow in regulation and large in hysteresis, so that the actuating mechanism is slow in callback, the gas pressure can not be stabilized, the air-fuel ratio is unbalanced, and the temperature control fluctuation is large. If the temperature control is not good, the heating process of the steel billet is extremely easy to be influenced, and the heating requirement of the steel grade is not met. Meanwhile, the imbalance of the air-fuel ratio also causes energy waste, and under the condition of unsatisfactory combustion conditions, manual intervention is also needed for manual combustion, so that the labor is consumed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a system for controlling the furnace temperature of a double-heat accumulating type heating furnace.
The furnace temperature control method of the double heat accumulating type heating furnace provided by the invention comprises the following steps:
and a combustion three-way valve adjusting step: controlling the start and stop of each section of combustion three-way valve of the heating furnace according to different gas pressure values;
and a gas valve adjusting step: the increment value of the pressure is obtained by incremental calculation of the pressure, and the feedforward control quantity of the gas valve is obtained by accumulating three increments in adjacent time, so that the valve regulating quantity is controlled.
The combustion three-way valve adjusting step includes the steps of:
s101: initializing related parameters, P 1 ＝0，P＝0，E 1 ＝0，E 2 ＝0，E＝0，Δ E ＝0，T＝0，T 1 =0; p is the collecting pressure of the gas at this time, P 1 For the last time of gasCollecting pressure, P 2 The last pressure of the gas is acquired, E is the difference between the last pressure and the current pressure, E 1 To save the last value of E, E 2 To preserve E 1 Last value, delta E For the feedforward valve regulating value, the T gas valve outputs the regulating value, T 1 Conventional gas control PID calculations.
S102: automatically judging the pressure value of the gas pipe network when the gas pressure is smaller than P m Greater than P mm Closing the combustion preheating section when the combustion preheating section is in the closed state; when the gas pressure is less than P mm Closing the combustion preheating section and adding a section; and cycling every 5 seconds, P m Is the low pressure limit of the gas, P mm Is the low pressure limit of the coal gas.
The gas valve adjusting step comprises the following steps:
step 201: collecting a gas pressure value P;
step 202: calculating the difference between the current and the last time of the gas pressure, and recording as E, wherein E=P-P 1 ；
Step 203: sequentially storing the difference of the gas pressure, namely E 2 ＝E 1 ，E 1 ＝E；
Step 204: calculating the gas valve feedforward value Δe, i.e. Δe=k 1 E+k 2 E 1 +k 3 E 2 ，k 1 ，k 2 ，k 3 Is a control constant;
step 205: final determination of valve output T, i.e. t=t 1 +ΔE，T 1 The PID calculation value is calculated for the traditional gas control.
And controlling the start and stop of each combustion control section according to the detected gas pressure fluctuation value.
The amplitude of the gas pressure fluctuation is calculated to feed forward and control the adjustment quantity of each gas adjusting valve.
The furnace temperature control system of the double heat accumulating type heating furnace comprises a combustion three-way valve adjusting module and a gas valve adjusting module.
The three-way valve adjusting module comprises the following submodules:
module 101: initializing related parameters to enable P 1 ＝0，P＝0，E 1 ＝0，E 2 ＝0，E＝0，Δ E ＝0，T＝0，T 1 =0; p is the collecting pressure of the gas at this time, P 1 R is the last pressure of the gas 2 The last pressure of the gas is acquired, E is the difference between the last pressure and the current pressure, E 1 To save the last value of E, E 2 To preserve E 1 Last value, delta E For the feedforward valve regulating value, the T gas valve outputs the regulating value, T 1 A traditional gas control PID calculated value;
module 102: control the start and stop of the combustion three-way valve when the gas pressure is smaller than P m Greater than P mm Closing the combustion preheating section when the combustion preheating section is in the closed state; when the gas pressure is less than P mm Closing the combustion preheating section and adding a section; and cycling every 5 seconds, P m Is the low pressure limit of the gas, P mm Is the low pressure limit of the coal gas.
The gas valve adjusting module comprises the following submodules:
module 201: the pressure for collecting the coal gas is recorded as P;
module 202: for calculating the difference between the current gas pressure and the last time, and recording as E, E=P-P 1 ；
Module 203: for preserving the differences in gas pressure in sequence, i.e. E 2 ＝E 1 ，E 1 ＝E；
Module 204: for calculating the gas valve feedforward value Δe, i.e. Δe=k 1 E+k 2 E 1 +k 3 E 2 ，k 1 ，k 2 ，k 3 Is a control constant;
module 205: for calculating valve output T, i.e. t=t 1 +ΔE，T 1 The PID calculation value is calculated for the traditional gas control.
The gas combustion control system further comprises an integral control module, and the integral control module controls the start and stop of each combustion control section according to the detected gas pressure fluctuation value.
The system also comprises a combustion control module, wherein the combustion control module calculates the amplitude of the gas pressure fluctuation, so that the feed-forward control of the adjustment quantity of each gas adjusting valve is realized.
Compared with the prior art, the invention has the following beneficial effects:
1. the start and stop of each control section of the heating furnace are controlled by detecting the fluctuation value of the gas pressure, so that the gas pressure of the heating furnace is ensured to be stable;
2. the adjustment quantity of the gas adjusting valve is intelligently feedforward controlled by calculating the amplitude of the gas pressure fluctuation, so that the stability of the air-fuel ratio is ensured;
3. the adaptability and stability of the whole system are improved, and the control precision of the whole temperature is increased.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of a method for controlling the furnace temperature of a dual regenerative heating furnace according to an embodiment of the present application;
fig. 2 is a block diagram of a furnace temperature control system of a dual regenerative heating furnace according to an embodiment of the present application.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Referring to fig. 1, the method for controlling the furnace temperature of the double heat accumulating type heating furnace comprises the following steps: a combustion three-way valve adjusting step and a gas valve adjusting step;
and a combustion three-way valve adjusting step: and controlling the start and stop of each section of combustion three-way valve of the heating furnace according to different gas pressure values, so as to protect the stability of the gas pressure in the heating furnace.
The combustion three-way valve adjusting step comprises the following steps:
s101: initializing related parameters, P 1 ＝0，P＝0，E 1 ＝0，E 2 ＝0，E＝0，Δ E ＝0，T＝0，T 1 =0; p isThe collecting pressure of the gas, P 1 For the last pressure acquisition of the gas, P 2 The last pressure of the gas is acquired, E is the difference between the last pressure and the current pressure, E 1 To save the last value of E, E 2 To preserve E 1 Last value, delta E For the feedforward valve regulating value, the T gas valve outputs the regulating value, T 1 Conventional gas control PID calculations.
S102: automatically judging the pressure value of the gas pipe network when the gas pressure is smaller than P m Greater than P mm Closing the combustion preheating section when the combustion preheating section is in the closed state; when the gas pressure is less than P mm And closing the combustion preheating section and adding one section. And cycling every 5 seconds, P m Is the low pressure limit of the gas, P mm Is the low pressure limit of the coal gas.
Wherein the preheating section is used as follows: providing a preheating function of a feed steel billet, wherein the first section and the second section are steel billet heating sections, and providing heat required by the steel billet; closing the preheating section/adding one section, namely reducing the fuel gas supply amount and reducing the gas pressure in the reaction furnace. When there is heat demand and the pressure of the gas in the furnace is normal, the preheating section/adding section is started.
And a gas valve adjusting step: the increment value of the pressure is obtained by incremental calculation of the pressure, and the feedforward control quantity of the gas valve is obtained by accumulating three increments in adjacent time, so that the valve regulating quantity is controlled.
The gas valve adjusting step comprises the following steps:
step 201: collecting a gas pressure value P;
step 202: calculating the difference between the current and the last time of the gas pressure, and recording as E, wherein E=P-P 1 ；
Step 203: sequentially storing the difference of the gas pressure, namely E 2 ＝E 1 ，E 1 ＝E；
Step 204: calculating the gas valve feedforward value Δe, i.e. Δe=k 1 E+k 2 E 1 +k 3 E 2 ，k 1 ，k 2 ，k 3 Is a control constant;
step 205: final determination of valve output T, i.e. t=t 1 +ΔE，T 1 Is conventionalAnd (5) calculating a value of the PID of the gas control.
When the pressure of the gas pipe network is stable, the traditional temperature PID adjusts the opening of the gas valve according to the gas pressure, so as to control the furnace temperature of each heating section; however, when the pressure fluctuation of the gas pipe network is large, the opening of the gas valve cannot be timely adjusted due to the fact that the actuating mechanism is slow to adjust and large in hysteresis, so that the furnace temperature is greatly fluctuated, the air-fuel ratio is unbalanced, and energy waste is caused. By collecting the fluctuation of the gas pressure, the feedforward control quantity is calculated according to the fluctuation range of the gas pressure, the opening of the gas valve is intelligently regulated, and the stability of the furnace temperature is improved.
The start and stop of each combustion control section are controlled according to the detected gas pressure fluctuation value, so that the gas pressure of the whole heating furnace is more stable. The amplitude of the gas pressure fluctuation is calculated to feed forward and control the regulating quantity of each gas regulating valve, so that the integral air-fuel ratio of the heating furnace is more stable.
Referring to fig. 2, the furnace temperature control system of the double heat accumulating type heating furnace comprises a combustion three-way valve adjusting module and a gas valve adjusting module.
The three-way valve adjusting module controls the start and stop of each section of combustion three-way valve of the heating furnace according to different gas pressure values, so as to protect the stability of the gas pressure in the heating furnace.
The three-way valve adjusting module comprises the following submodules:
module 101: initializing related parameters to enable P 1 ＝0，P＝0，E 1 ＝0，E 2 ＝0，E＝0，Δ E ＝0，T＝0，T 1 =0; p is the collecting pressure of the gas at this time, P 1 For the last pressure acquisition of the gas, P 2 The last pressure of the gas is acquired, E is the difference between the last pressure and the current pressure, E 1 To save the last value of E, E 2 To preserve E 1 Last value, delta E For the feedforward valve regulating value, the T gas valve outputs the regulating value, T 1 A traditional gas control PID calculated value;
module 102: control the start and stop of the combustion three-way valve when the gas pressure is smaller than P m Greater than P mm Closing the combustion preheating section when the combustion preheating section is in the closed state;when the gas pressure is less than P mm And closing the combustion preheating section and adding one section. And cycling every 5 seconds, P m Is the low pressure limit of the gas, P mm Is the low pressure limit of the coal gas.
The gas valve regulating module calculates the increment value of the pressure by the increment calculation of the pressure, and adds up the increment for three times in adjacent time to obtain the feedforward control quantity of the gas valve, thereby controlling the valve regulating quantity.
The gas valve adjusting module comprises the following submodules:
module 201: the pressure for collecting the coal gas is recorded as P;
module 202: for calculating the difference between the current gas pressure and the last time, and recording as E, E=P-P 1 ；
Module 203: for preserving the differences in gas pressure in sequence, i.e. E 2 ＝E 1 ，E 1 ＝E；
Module 204: for calculating the gas valve feedforward value Δe, i.e. Δe=k 1 E+k 2 E 1 +k 3 E 2 ，k 1 ，k 2 ，k 3 Is a control constant;
module 205: for calculating valve output T, i.e. t=t 1 +ΔE，T 1 The PID calculation value is calculated for the traditional gas control.
The double-heat accumulating type heating furnace temperature control system also comprises an integral control module, and the integral control module controls the start and stop of each combustion control section according to the magnitude of the detected gas pressure fluctuation value, so that the integral gas pressure of the heating furnace is more stable. The air-fuel ratio control system further comprises a combustion control module, wherein the combustion control module calculates the amplitude of the gas pressure fluctuation, so that the feed-forward control of the adjustment quantity of each gas adjusting valve is realized, and the integral air-fuel ratio of the heating furnace is more stable.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (6)
1. The method for controlling the furnace temperature of the double heat accumulating type heating furnace is characterized by comprising the following steps:
and a combustion three-way valve adjusting step: controlling the switch of each section of combustion three-way valve of the heating furnace according to different gas pressure values;
and a gas valve adjusting step: the increment value of the pressure is obtained through incremental calculation of the pressure, and the feedforward control quantity of the gas valve is obtained through accumulation of three increments in adjacent time, so that the valve regulating quantity is controlled;
the combustion three-way valve adjusting step includes the steps of:
s101: initializing related parameters, P 1 ＝0，P＝0，E 1 ＝0，E 2 ＝O，E＝0，Δ E ＝0，T＝0，T 1 =0; p is the collecting pressure of the gas at this time, P 1 For the last pressure acquisition of the gas, P 2 The last pressure of the gas is acquired, E is the difference between the last pressure and the current pressure, E 1 To save the last value of E, E 2 To preserve E 1 Last value, delta E For the feedforward valve regulating value, the T gas valve outputs the regulating value, T 1 A traditional gas control PID calculated value;
s102: automatically judging the pressure value of the gas pipe network when the gas pressure is smaller than P m Greater than P mm Closing the combustion preheating section when the combustion preheating section is in the closed state; when the gas pressure is less than P mm Closing the combustion preheating section and adding a section; and cycling every 5 seconds, P m Is the low pressure limit of the gas, P mm The gas pressure is low and low;
the gas valve adjusting step comprises the following steps:
step 201: collecting a gas pressure value P;
step 202: calculating the difference between the current and the last time of the gas pressure, and recording as E, wherein E=P-P 1 ；
Step 203: sequentially storing the difference of the gas pressure, namely E 2 ＝E 1 ，E 1 ＝E；
Step 204: calculating gas valveGate feed forward value Δe, i.e. Δe=k 1 E+k 2 E 1 +k 3 E 2 ，k 1 ，k 2 ，k 3 Is a control constant;
step 205: final determination of valve output T, i.e. t=t 1 +ΔE，T 1 The PID calculation value is calculated for the traditional gas control.
2. The method for controlling the furnace temperature of the double heat accumulating type heating furnace according to claim 1, wherein: and controlling the start and stop of each combustion control section according to the detected gas pressure fluctuation value.
3. The method for controlling the furnace temperature of the double heat accumulating type heating furnace according to claim 1, wherein: the amplitude of the gas pressure fluctuation is calculated to feed forward and control the adjustment quantity of each gas adjusting valve.
4. The furnace temperature control system of the double heat accumulating type heating furnace is characterized in that: a method for controlling the furnace temperature of a double heat accumulating type heating furnace according to any one of claims 1 to 3, comprising a combustion three-way valve adjusting module and a gas valve adjusting module;
the three-way valve adjusting module comprises the following submodules:
module 101: initializing related parameters to enable P 1 ＝0，P＝0，E 1 ＝0，E 2 ＝0，E＝0，Δ E ＝0，T＝0，T 1 =0; p is the collecting pressure of the gas at this time, P 1 For the last pressure acquisition of the gas, P 2 The last pressure of the gas is acquired, E is the difference between the last pressure and the current pressure, E 1 To save the last value of E, E 2 To preserve E 1 Last value, delta E For the feedforward valve regulating value, the T gas valve outputs the regulating value, T 1 A traditional gas control PID calculated value;
module 102: control the start and stop of the combustion three-way valve when the gas pressure is smaller than P m Greater than P mm Closing the combustion preheating section when the combustion preheating section is in the closed state; when the gas pressure is less than P mm Closing the combustion preheating section and adding a section; and is cycled once every 5 seconds,P m is the low pressure limit of the gas, P mm The gas pressure is low and low;
the gas valve adjusting module comprises the following submodules:
module 201: the pressure for collecting the coal gas is recorded as P;
module 202: for calculating the difference between the current gas pressure and the last time, and recording as E, E=P-P 1 ；
Module 203: for preserving the differences in gas pressure in sequence, i.e. E 2 ＝E 1 ，E 1 ＝E；
Module 204: for calculating the gas valve feedforward value Δe, i.e. Δe=k 1 E+k 2 E 1 +k 3 E 2 ，k 1 ，k 2 ，k 3 Is a control constant;
module 205: for calculating valve output T, i.e. t=t 1 +ΔE，T 1 The PID calculation value is calculated for the traditional gas control.
5. The dual regenerative furnace temperature control system according to claim 4, wherein: the gas combustion control system further comprises an integral control module, and the integral control module controls the start and stop of each combustion control section according to the detected gas pressure fluctuation value.
6. The dual regenerative furnace temperature control system according to claim 4, wherein: the system also comprises a combustion control module, wherein the combustion control module calculates the amplitude of the gas pressure fluctuation, so that the feed-forward control of the adjustment quantity of each gas adjusting valve is realized.
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