CN114015860A - Method and system for controlling furnace temperature of double-heat-storage type heating furnace - Google Patents
Method and system for controlling furnace temperature of double-heat-storage type heating furnace Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 52
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- 239000003034 coal gas Substances 0.000 claims description 5
- 241000084490 Esenbeckia delta Species 0.000 claims description 3
- -1 Δ E ═ k Chemical compound 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- 239000000446 fuel Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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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
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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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- 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
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Abstract
The invention provides a method and a system for controlling the furnace temperature of a double heat accumulating type heating furnace, which comprises the following steps: adjusting a combustion three-way valve: controlling the start and stop of each section of combustion three-way valve of the heating furnace according to different gas pressure values; adjusting a gas valve: the incremental value of the pressure is obtained by incremental calculation of the pressure, and the feed-forward control quantity of the gas valve is obtained by the accumulation of three increments in adjacent time, so that the valve regulating quantity is controlled. The invention solves the problem that the pressure of the gas in the heating furnace can not be stabilized in time when the pressure fluctuation of the gas pipe network is large by the existing temperature PID control method.
Description
Technical Field
The invention relates to a heating furnace temperature control method, in particular to a method and a system for controlling the furnace temperature of a double heat accumulating type heating furnace with large gas pipe network 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 temperature control precision of the reaction furnace is improved through the temperature control system, so that the heating quality of the blank is improved, the head-tail temperature difference and the uniformity of the blank are accurately controlled, the energy consumption is reduced, and the system has important significance for the energy conservation of iron and steel enterprises. A reaction furnace comprises a preheating section, an adding section and a soaking section, wherein 4 physical sections of the adding section and the soaking section are provided, the adjusting modes of gas valves of all the sections are the same, the preheating section is used for preheating feeding steel billets, the adding section and the adding section are heating sections of the steel billets, the steel billets are heated to required temperatures, the soaking section prolongs the heating time of the steel billets, and the temperature difference between the inside and the outside of the steel billets is reduced.
In the chinese invention patent document with publication number CN103019097A, an optimized control system for a steel rolling heating furnace is disclosed, which establishes an online furnace temperature setter according to different types of steel billets, production rhythm, initial temperature of the steel billets and tapping temperature, and controls the tapping temperature of the steel billets by controlling the furnace temperature; based on thermal efficiency models under various working conditions, calculating the load variation of the heating furnace and using 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 searched by establishing an air-fuel ratio optimization control model. When the pressure fluctuation of the gas pipe network is large, the scheme cannot adjust the pressure fluctuation in time, so that the temperature fluctuation of the heating furnace is large, and the air-fuel ratio is disordered.
The temperature of a common double regenerative heating furnace is regulated in a PID mode, and the opening degree of a valve is controlled through feedback of actual temperature and 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 cannot determine the flow rate of the gas, and as the regulating of the actuating mechanism of the heating furnace is slow and the hysteresis is large, the actuating mechanism is slow to adjust, the gas pressure cannot be stabilized, the air-fuel ratio is disordered, and the temperature control fluctuation is large. If the temperature is not well controlled, the heating process of the steel billet is very easy to be influenced, and the heating requirement of the steel grade can not be met. Meanwhile, the imbalance of the air-fuel ratio also causes the waste of energy, and manual combustion needs to be carried out by manual intervention under the condition of unsatisfactory combustion conditions, thus consuming manpower.
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 regenerative heating furnace.
The method for controlling the furnace temperature of the double heat storage type heating furnace provided by the invention comprises the following steps:
adjusting a combustion three-way valve: controlling the start and stop of each section of combustion three-way valve of the heating furnace according to different gas pressure values;
adjusting a gas valve: the incremental value of the pressure is obtained by incremental calculation of the pressure, and the feed-forward control quantity of the gas valve is obtained by the 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: initialization of the relevant parameter, P1＝0，P＝0，E1＝0，E2＝0，E＝0，ΔE＝0，T＝0，T10; p is the pressure of the gas collected this time, P1Last time pressure, P, was collected for the gas2The last time the pressure is collected on the gas, E is the difference value between the current time and the last time, E1To save the last value of E, E2To preserve E1Last value, ΔEFor feeding forward the valve regulation, T gas valve output regulation, T1Traditional gas control PID calculated values.
S102: automatically judging the pressure value of the gas pipe network when the gas pressure is less than PmIs greater than PmmWhen the combustion preheating section is closed; when the gas pressure is less than PmmWhen the combustion preheating section is closed, the combustion preheating section and the adding section are closed; and cycle every 5 seconds, PmIs the lower limit of gas pressure, PmmThe gas pressure is 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 gas pressure and the last time, and recording the difference as E, E-P1；
Step 203: the difference in gas pressure is stored in sequence, i.e. E2＝E1，E1＝E；
Step 204: calculating the feed forward value delta E of the gas valve, i.e. delta E-k1E+k2E1+k3E2，k1，k2，k3Is a control constant;
step 205: the valve output T, i.e. T ═ T, is finally determined1+ΔE，T1Calculated value for traditional gas control PID.
And controlling the start and stop of each combustion control section according to the detected gas pressure fluctuation value.
And calculating the amplitude of the gas pressure fluctuation to feed forward and control the regulating quantity of each gas regulating 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 sub-modules:
the module 101: initializing the relevant parameters to P1＝0，P＝0，E1＝0，E2＝0，E＝0，ΔE＝0，T＝0，T10; p is the pressure of the gas collected this time, P1Last time pressure, R, was collected for the gas2The last time the pressure is collected on the gas, E is the difference value between the current time and the last time, E1To save the last value of E, E2To preserve E1Last value, ΔEFor feeding forward the valve regulation, T gas valve output regulation, T1PID calculated value of traditional gas control;
the module 102: controlling the start and stop of the three-way valve when the gas pressure is less than PmIs greater than PmmWhen the combustion preheating section is closed; when the gas pressure is less than PmmWhen the combustion preheating section is closed, the combustion preheating section and the adding section are closed; and cycle every 5 seconds, PmIs the lower limit of gas pressure, PmmThe gas pressure is low.
The gas valve regulating module comprises the following sub-modules:
the module 201: the device is used for collecting the pressure of the coal gas, and the collection result is recorded as P;
the module 202: calculating the difference between the gas pressure and the last time, and recording the difference as E, E-P1；
The module 203: for preserving the difference in gas pressure in sequence, i.e. E2＝E1，E1＝E；
The module 204: for calculating feed-forward value Δ E, i.e. Δ E ═ k, of gas valve1E+k2E1+k3E2，k1，k2，k3Is a control constant;
the module 205: for calculating the valve output T, i.e. T ═ T1+ΔE，T1Calculated value for traditional gas control PID.
The gas burner also comprises an integral control module, wherein the integral control module controls the start and stop of each combustion control section according to the detected gas pressure fluctuation value.
The gas pressure regulating device further comprises a combustion control module, and the combustion control module calculates the amplitude of gas pressure fluctuation so as to feed forward and control the regulating quantity of each gas regulating valve.
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 pressure fluctuation value of the coal gas, so that the stability of the coal gas pressure of the heating furnace is ensured;
2. the regulating quantity of the gas regulating valve is intelligently feedforward controlled by calculating the amplitude of gas pressure fluctuation, so that the stability of the air-fuel ratio is ensured;
3. the overall adaptability and stability of the system are improved, and the control precision of the overall temperature is improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a flowchart of a method for controlling furnace temperatures of a double regenerative heating furnace according to an embodiment of the present application;
fig. 2 is a structural diagram of a furnace temperature control system of a double regenerative heating furnace in 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 invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Referring to fig. 1, the method for controlling the furnace temperature of the double regenerative heating furnace includes: a combustion three-way valve adjusting step and a gas valve adjusting step;
adjusting a combustion three-way valve: the start and stop of each section of the combustion three-way valve of the heating furnace are controlled according to different gas pressure values, so that the stability of the gas pressure in the heating furnace is protected.
The combustion three-way valve adjusting step comprises the following steps:
s101: initialization of the relevant parameter, P1＝0，P＝0，E1＝0，E2＝0，E＝0，ΔE＝0，T＝0，T10; p is the pressure of the gas collected this time, P1Last time pressure, P, was collected for the gas2The last time the pressure is collected on the gas, E is the difference value between the current time and the last time, E1To save the last value of E, E2To preserve E1Last value, ΔEFor feeding forward the valve regulation, T gas valve output regulation, T1Traditional gas control PID calculated values.
S102: automatically judging the pressure value of the gas pipe network when the gas pressure is less than PmIs greater than PmmWhen the combustion preheating section is closed; when the gas pressure is less than PmmWhile closing the combustion preheating section and the addition section. And cycle every 5 seconds, PmIs the lower limit of gas pressure, PmmThe gas pressure is low.
Wherein the preheating section comprises the following components: the preheating function of the fed steel billet is provided, and the first section and the second section are both steel billet heating sections, so that the heat requirement of the steel billet is provided; and closing the preheating section/adding section, namely reducing the gas supply amount of the fuel and reducing the gas pressure in the reaction furnace. When the heat demand and the gas pressure in the furnace are normal, the preheating section/the adding section is started.
Adjusting a gas valve: the incremental value of the pressure is obtained by incremental calculation of the pressure, and the feed-forward control quantity of the gas valve is obtained by the accumulation of 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 gas pressure and the last time, and recording the difference as E, E-P1；
Step 203: the difference in gas pressure is stored in sequence, i.e. E2＝E1，E1＝E；
Step 204: calculating the feed forward value delta E of the gas valve, i.e. delta E-k1E+k2E1+k3E2，k1，k2，k3Is a control constant;
step 205: the valve output T, i.e. T ═ T, is finally determined1+ΔE，T1Calculated value for traditional gas control PID.
When the pressure of the gas pipe network is stable, the traditional temperature PID adjusts the opening degree of a gas valve according to the gas pressure, so that the furnace temperature of each heating section is controlled; however, when the pressure fluctuation of the gas pipe network is large, the opening degree of the gas valve cannot be adjusted in time due to slow adjustment and large hysteresis of the actuating mechanism, so that the furnace temperature is greatly fluctuated, the air-fuel ratio is disordered, and the energy is wasted. Through collecting the fluctuation of the gas pressure, the feedforward control quantity is calculated according to the fluctuation range of the gas pressure, the opening degree of a gas valve is intelligently adjusted, 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 overall gas pressure of the 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 overall air-fuel ratio of the heating furnace is more stable.
Referring to fig. 2, the furnace temperature control system of the double regenerative 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 that the stability of the gas pressure in the heating furnace is protected.
The three-way valve adjusting module comprises the following sub-modules:
the module 101: initializing the relevant parameters to P1＝0，P＝0，E1＝0，E2＝0，E＝0，ΔE＝0，T＝0，T10; p is the pressure of the gas collected this time, P1Last time pressure, P, was collected for the gas2The last time the pressure is collected on the gas, E is the difference value between the current time and the last time, E1To save the last value of E, E2To preserve E1Last value, ΔEFor feeding forward the valve regulation, T gas valve output regulation, T1PID calculated value of traditional gas control;
the module 102: controlling the start and stop of the three-way valve when the gas pressure is less than PmIs greater than PmmWhen the combustion preheating section is closed; when the gas pressure is less than PmmWhile closing the combustion preheating section and the addition section. And cycle every 5 seconds, PmIs the lower limit of gas pressure, PmmThe gas pressure is low.
The gas valve adjusting module obtains an increment value of the pressure by performing incremental calculation on the pressure, and obtains a gas valve feedforward control quantity by accumulating three increments in adjacent time so as to control the valve adjusting quantity.
The gas valve regulating module comprises the following sub-modules:
the module 201: the device is used for collecting the pressure of the coal gas, and the collection result is recorded as P;
the module 202: calculating the difference between the gas pressure and the last time, and recording the difference as E, E-P1；
The module 203: for preserving the difference in gas pressure in sequence, i.e. E2＝E1，E1＝E；
The module 204: for calculating feed-forward value Δ E, i.e. Δ E ═ k, of gas valve1E+k2E1+k3E2，k1，k2，k3Is a control constant;
the module 205: for calculating the valve output T, i.e. T ═ T1+ΔE，T1Calculated value for traditional gas control PID.
The furnace temperature control system of the double heat accumulating type heating furnace also 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, so that the integral gas pressure of the heating furnace is more stable. The gas pressure fluctuation control system further comprises a combustion control module, and the combustion control module calculates the amplitude of gas pressure fluctuation, so that the adjustment quantity of each gas adjusting valve is controlled in a feedforward mode, and the overall air-fuel ratio of the heating furnace is more stable.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. The method for controlling the furnace temperature of the double heat storage type heating furnace is characterized by comprising the following steps of:
adjusting a combustion three-way valve: controlling the opening and closing of each section of combustion three-way valve of the heating furnace according to different gas pressure values;
adjusting a gas valve: the incremental value of the pressure is obtained by incremental calculation of the pressure, and the feed-forward control quantity of the gas valve is obtained by the accumulation of three increments in adjacent time, so that the valve regulating quantity is controlled.
2. The furnace temperature control method of a double regenerative heating furnace according to claim 1, wherein: the combustion three-way valve adjusting step includes the steps of:
s101: initialization of the relevant parameter, P1＝0，P＝0，E1＝0，E2＝0，E＝0，ΔE＝0，T＝0，T10; p is the pressure of the gas collected this time, P1Last time pressure, P, was collected for the gas2The last time the pressure is collected on the gas, E is the difference value between the current time and the last time, E1To save the last value of E, E2To preserve E1Last value, ΔETo a feed forward valveValve regulating value, T gas valve output regulating value, T1PID calculated value of traditional gas control;
s102: automatically judging the pressure value of the gas pipe network when the gas pressure is less than PmIs greater than PmmWhen the combustion preheating section is closed; when the gas pressure is less than PmmWhen the combustion preheating section is closed, the combustion preheating section and the adding section are closed; and cycle every 5 seconds, PmIs the lower limit of gas pressure, PmmThe gas pressure is low.
3. The furnace temperature control method of a double regenerative heating furnace according to claim 2, wherein: the gas valve adjusting step comprises the following steps:
step 201: collecting a gas pressure value P;
step 202: calculating the difference between the gas pressure and the last time, and recording the difference as E, E-P1；
Step 203: the difference in gas pressure is stored in sequence, i.e. E2＝E1，E1＝E；
Step 204: calculating the feed forward value delta E of the gas valve, i.e. delta E-k1E+k2E1+k3E2，k1，k2，k3Is a control constant;
step 205: the valve output T, i.e. T ═ T, is finally determined1+ΔE，T1Calculated value for traditional gas control PID.
4. The furnace temperature control method of a double regenerative 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.
5. The furnace temperature control method of a double regenerative heating furnace according to claim 1, wherein: and calculating the amplitude of the gas pressure fluctuation to feed forward and control the regulating quantity of each gas regulating valve.
6. Two regenerative heating furnace temperature control system, its characterized in that: the method for controlling the furnace temperature of the double regenerative heating furnace according to any one of claims 1 to 5, comprising a three-way valve adjusting module for combustion and a gas valve adjusting module.
7. The furnace temperature control system of a double regenerative heating furnace according to claim 6, wherein: the three-way valve adjusting module comprises the following sub-modules:
the module 101: initializing the relevant parameters to P1＝0，P＝0，E1＝0，E2＝0，E＝0，ΔE＝0，T＝0，T10; p is the pressure of the gas collected this time, P1Last time pressure, P, was collected for the gas2The last time the pressure is collected on the gas, E is the difference value between the current time and the last time, E1To save the last value of E, E2To preserve E1Last value, ΔEFor feeding forward the valve regulation, T gas valve output regulation, T1PID calculated value of traditional gas control;
the module 102: controlling the start and stop of the three-way valve when the gas pressure is less than PmIs greater than PmmWhen the combustion preheating section is closed; when the gas pressure is less than PmmWhen the combustion preheating section is closed, the combustion preheating section and the adding section are closed; and cycle every 5 seconds, PmIs the lower limit of gas pressure, PmmThe gas pressure is low.
8. The furnace temperature control system of a double regenerative heating furnace according to claim 6, wherein: the gas valve regulating module comprises the following sub-modules:
the module 201: the device is used for collecting the pressure of the coal gas, and the collection result is recorded as P;
the module 202: calculating the difference between the gas pressure and the last time, and recording the difference as E, E-P1；
The module 203: for preserving the difference in gas pressure in sequence, i.e. E2＝E1，E1＝E；
The module 204: for calculating feed-forward value Δ E, i.e. Δ E ═ k, of gas valve1E+k2E1+k3E2，k1，k2，k3Is a control constant;
the module 205: for calculating the valve output T, i.e. T ═ T1+ΔE，T1Calculated value for traditional gas control PID.
9. The furnace temperature control system of a double regenerative heating furnace according to claim 6, wherein: the gas burner also comprises an integral control module, wherein the integral control module controls the start and stop of each combustion control section according to the detected gas pressure fluctuation value.
10. The furnace temperature control system of a double regenerative heating furnace according to claim 6, wherein: the gas pressure regulating device further comprises a combustion control module, and the combustion control module calculates the amplitude of gas pressure fluctuation so as to feed forward and control the regulating quantity of each gas regulating valve.
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