CN110699527A - Operation method of nitrogen interlocking control system for detecting oxygen content on hot galvanizing vertical annealing furnace - Google Patents
Operation method of nitrogen interlocking control system for detecting oxygen content on hot galvanizing vertical annealing furnace Download PDFInfo
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- CN110699527A CN110699527A CN201910996350.0A CN201910996350A CN110699527A CN 110699527 A CN110699527 A CN 110699527A CN 201910996350 A CN201910996350 A CN 201910996350A CN 110699527 A CN110699527 A CN 110699527A
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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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
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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
- C21D1/26—Methods of annealing
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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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
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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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
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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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
Abstract
The invention provides an operation method of a nitrogen interlocking control system for detecting the oxygen content of hot galvanizing vertical annealing furnace, wherein each subsection in the vertical annealing furnace is provided with an oxygen content detecting instrument, is separated by a partition wall and is provided with a rapid cooling section, a slow cooling section, a heating section, a preheating section and a horizontal steering section; when the oxygen content is abnormal, the interlocking protection control module analyzes the abnormal condition and sends a signal to the secondary control system, and the secondary control system sends an instruction of speed reduction production, speed reduction shutdown, quick shutdown or emergency shutdown to the execution component according to the set range of the abnormal oxygen content. Has the advantages that: the distribution condition of the oxygen content of the annealing furnace can be monitored more accurately, and fault points can be found out rapidly and processed in time when abnormal conditions occur.
Description
Technical Field
The invention belongs to steel annealing equipment, and relates to an operation method of a nitrogen interlocking control system for detecting the oxygen content on and off a hot galvanizing vertical annealing furnace.
Background
The oxygen content detection of the hot galvanizing continuous vertical annealing furnace generally uses a fixed point at the top or the bottom of an area to set an oxygen content detection point to detect the atmosphere in a hearth, but the leakage at the bottom or the top of the furnace cannot be judged in the shortest time, the investigation time is prolonged, the safety risk of the annealing furnace is greatly improved, and the leakage point needs to be stopped to process when necessary before the problem is solved.
The temperature of the annealing furnace is high during normal production, generally above 680-850 ℃, nitrogen charging is stopped when the nitrogen flow of the annealing furnace suddenly drops or the nitrogen flow is abnormal and misoperation is carried out, the furnace pressure of the annealing furnace drops, external cold air enters the annealing furnace, the oxygen content is abnormal, the damage to the annealing furnace is great, important equipment such as refractory materials, linings, furnace rollers and the like of the annealing furnace are impacted firstly, strip steel is quickly oxidized, a large amount of iron scales are generated, secondary impact is generated on the roller surfaces of the furnace rollers and an inspection sensor, equipment in the annealing furnace is damaged permanently, the maintenance and maintenance cost is high, the maintenance cost is higher than that of new equipment, the construction time is long, the equipment function drops below a normal value, and the influence on production and maintenance is great.
Disclosure of Invention
The invention provides an operation method of a nitrogen interlocking control system for detecting the oxygen content on and off a hot galvanizing vertical annealing furnace.
The technical scheme of the invention is as follows: an oxygen content detection instrument is arranged on each section in the vertical annealing furnace, the sections are separated by partition walls, gaps for steel strips to pass through are reserved on the partition walls, the oxygen content detection at the top of a quenching section and the oxygen content detection at the bottom of the quenching section are provided, the oxygen content detection at the top of a slow cooling section and the oxygen content detection at the bottom of the slow cooling section are provided, the oxygen content detection at the top of a heating section and the oxygen content detection at the bottom of the heating section are provided, the oxygen content detection at the top of a preheating section and the oxygen content detection at the bottom of the preheating section are provided, and only one oxygen content detection point is arranged on a horizontal turning section of the annealing furnace due to the small space; the oxygen content data measured by the oxygen content detecting instrument are integrated to the oxygen content detection and transmitted to the signal acquisition module, the signal acquisition module is connected with the interlocking protection control module, the interlocking protection control module is connected with the secondary control system, the oxygen content detecting instrument measures the oxygen content, the signal acquisition module acquires an oxygen content feedback signal, the interlocking protection control module carries out processing and analysis, the interlocking protection control module is interlocked with the secondary control system, when the oxygen content is abnormal, the interlocking protection control module analyzes abnormal conditions and sends out signals to the secondary control system, and the secondary control system sends out instructions of speed reduction production or speed reduction shutdown or quick shutdown or emergency shutdown to the execution part according to the set range of the oxygen content abnormality.
Furthermore, two oxygen content detection instruments are arranged on the upper part and the lower part of each section, one oxygen content detection instrument is used, and the other oxygen content detection instrument is standby.
The invention has the beneficial effects that: the distribution condition of monitoring annealing stove oxygen content that can be more accurate, the fault point can be found out rapidly to the abnormal conditions appearing, handle the fault point in the shortest time, can not lead to the production facility accident that the production line shut down after the problem that can handle in time is handled, install two oxygen content check points, to one of them back of breaking down, the oxygen content that another can regard as production monitoring detects spare part, it changes to maintain a roller labour completion shut down after, participate in nitrogen pressure and furnace pressure, hydrogen main valve and production line scram or stop soon and interlock, the harm to annealing stove and other equipment under the restriction nitrogen gas abnormal conditions.
Drawings
FIG. 1 is a schematic diagram of a nitrogen interlocking control system of a vertical annealing furnace according to the present invention
FIG. 2 is a schematic diagram of a nitrogen interlock control system for detecting the upper and lower oxygen contents of an annealing furnace according to the present invention;
FIG. 3 is a schematic view of the interlock for nitrogen flow error and misoperation in the vertical annealing furnace of the present invention;
FIG. 4 is a schematic view of the nitrogen pipe network pressure or flow abnormal deceleration shutdown interlock of the vertical annealing furnace of the present invention;
FIG. 5 is a schematic view of an emergency stop interlock for abnormal pressure or flow in a nitrogen pipe network of a vertical annealing furnace according to the present invention;
description of the symbols:
1. annealing furnace
100 annealing furnace body
101. Furnace temperature and pressure display of preheating section
102. Furnace temperature and pressure display of heating section
103. Furnace temperature and pressure display of slow cooling section furnace
104. Furnace temperature and pressure display of quenching zone
105. Furnace temperature and pressure display of horizontal turning section
106. Furnace inlet seal
107. Preheating section diffusing
108. Heating section diffusing
109. Slow cooling stage diffusion
110. Quench zone bleed
111. Quench section top oxygen content detection
112. Quench section bottom oxygen content detection
113. Detection of top oxygen content in slow cooling section
114. Detection of oxygen content at bottom of slow cooling section
115. Detection of oxygen content at top of heating section
116. Detection of oxygen content at bottom of heating section
117. Detection of top oxygen content in preheating section
118. Detection of oxygen content at bottom of preheating section
2. Nitrogen pipe network
200. Nitrogen manifold
201. Nitrogen quick-cutting valve
202. Nitrogen flow pressure detection
203. Nitrogen flow pressure display
204. Nitrogen-hydrogen mixed three-way regulating valve
205. Nitrogen-hydrogen protective gas main pipe of grate
3. Hydrogen pipe network
300. Hydrogen main pipe
301. Hydrogen fast-cutting valve
302. Hydrogen flow rate pressure detection
303. Hydrogen flow pressure display
400. Interlocking condition of nitrogen flow error or misoperation
401. Nitrogen flow regulating valve
402. Limitation of misoperation
403. Triggering interlock protection
404. Conditions of allowable movement of the apparatus
405. Fault recovery
406. Within the range of adjustment
407. Feedback signal determination of a regulated value
500. Nitrogen exception handling
501. Abnormal monitoring of pressure and flow of nitrogen pipe network
502. Judgment of abnormality caused by abnormal nitrogen in annealing furnace
503. Prompt contact peripheral emergency handling
504. Judgment of pressure trend of nitrogen pipe network of annealing furnace
505. Production with prompt of speed reduction
506. The production line speed reduction and shutdown conditions meet
507. Trigger shutdown interlock signal
600. Relatively abnormal treatment of nitrogen
601. The monitoring of the pressure and the flow of the nitrogen pipe network is relatively abnormal
602. Judgment of abnormality caused by abnormal nitrogen in annealing furnace
603. Immediate contact peripheral emergency handling
604. Annealing furnace nitrogen pipe network pressure fluctuation large trend judgment
605. Recoverable predicted time of alarm residual
606. Production line emergency shutdown
607. Triggering an emergency stop interlock signal
700. Nitrogen interlocking control system
701. Operation end of nitrogen interlocking control system
702. Interlock protection control module
703. Signal acquisition module
704. Two-stage control system
705. Furnace temperature detection
706. Furnace pressure detection
707. Oxygen content detection
708. Dew point detection
709. Gas flow detection
710. Air-fuel ratio variable detection
711. Production specification
712. Line speed
713. Production at reduced speed
714. Stopping at reduced speed
715. Quick stop
716. And (5) emergency shutdown.
Detailed Description
An operation method of a nitrogen interlocking control system for detecting the oxygen content of hot galvanizing vertical annealing furnace is characterized in that two oxygen content detecting instruments are arranged in each segment of the vertical annealing furnace, one oxygen content detecting instrument is used, the other oxygen content detecting instrument is standby, the segments are separated by partition walls, and gaps for steel strips to pass through are reserved on the partition walls. The segment is provided with a quenching section top oxygen content detection 111, a quenching section bottom oxygen content detection 112, a quenching section top oxygen content detection 113, a quenching section bottom oxygen content detection 114, a heating section top oxygen content detection 115, a heating section bottom oxygen content detection 116, a preheating section top oxygen content detection 117 and a preheating section bottom oxygen content detection 118, and the horizontal turning section of the annealing furnace is only provided with one oxygen content detection point due to small space; the oxygen content data measured by the oxygen content detecting instrument is integrated to the oxygen content detecting 707 and transmitted to the signal collecting module 703, the signal collecting module 703 is connected with the interlocking protection control module 702, the interlocking protection control module 702 is connected with the secondary control system 704, the oxygen content detecting instrument measures the oxygen content, the signal collecting module 703 collects an oxygen content feedback signal, the interlocking protection control module 702 carries out processing and analysis, the interlocking protection control module 702 is interlocked with the secondary control system 704, when the oxygen content is abnormal, the interlocking protection control module 702 analyzes the abnormal condition and sends a signal to the secondary control system 704, and the secondary control system 704 sends an instruction of speed reduction production or speed reduction shutdown or quick shutdown or emergency shutdown to the execution part according to the set range of the oxygen content abnormality.
The nitrogen control of the hot galvanizing continuous hot galvanizing vertical annealing furnace has high requirements on the control of the temperature in the furnace and the atmosphere in the furnace, and great accidents are caused by abnormal operation or abnormal oxygen. The distribution condition of monitoring annealing stove oxygen content that multipoint mode oxygen content detection can be more accurate, the fault point can be found out rapidly to the abnormal conditions appearing, handle the fault point in the shortest time, can not lead to the production facility accident that the production line shut down after the problem that can handle in time is handled, install two oxygen content check points, to one of them back of breaking down, another one can be as the spare component of oxygen content detection of production monitoring, maintain a roller labour and end the change after shutting down, participate in nitrogen pressure and furnace pressure, hydrogen main valve and production line scram or stop soon and interlock, the harm to annealing stove and other equipment under the restriction nitrogen gas abnormal conditions. Under the normal production state, the minimum control quantity of the nitrogen is interlocked with the production system, and under the abnormal state, the nitrogen system is interlocked with the production system, wherein the nitrogen system has fluctuation which can be compensated by reducing the speed, the nitrogen system slowly reduces and can also recover the operation time, the time for obviously recovering the abnormal fluctuation of the nitrogen system is shorter, and the abnormal fluctuation of the nitrogen system can not be recovered and needs emergency shutdown treatment. The invention mainly adds an interlocking protection control module 702 connected with an operating end 701 of the nitrogen interlocking control system in the interlocking nitrogen interlocking control system 700 which is made aiming at the normal and abnormal processing methods and fault types, the interlocking protection control module 702 is connected with a secondary control system 704, a signal acquisition module 703 feeds back acquired data to the interlocking protection control module 702, the acquired feedback signals connected with the signal acquisition module 703 mainly comprise detection elements and sensors related to nitrogen interlocking control, such as a furnace temperature detection 705, a furnace pressure detection 706, an oxygen content detection 707, a dew point detection 708, a gas quantity detection 709, an air-fuel ratio variable detection 710 and the like, real values refreshed at any time are fed back to the operating system and the interlocking control system, an annealing furnace 1 is connected with the secondary control system 704 of the production line and the operating end 701 of the nitrogen interlocking control system to mutually send and transmit monitoring data, the normal operation of a nitrogen and hydrogen system of the annealing furnace is ensured, and the abnormality in the nitrogen control system mainly exists in that the normal production of a production line is impacted by the fluctuation or abnormal reduction or stop of the pressure of operators and peripheral pipe networks. A nitrogen inlet is provided by a nitrogen header pipe 200 in a nitrogen pipe network 2, a nitrogen flow rate and pressure detection 202 is connected through a nitrogen fast-switching valve 201 to detect the pressure and flow rate of nitrogen and display the nitrogen to an HMI picture or a field instrument display, the nitrogen is conveyed to each area of an annealing furnace 1 and displays the furnace temperature and the furnace pressure, five sections of detection and display are generally arranged in the furnace body of the annealing furnace, namely, a preheating section furnace temperature and furnace pressure display 101, a heating section furnace temperature and furnace pressure display 102, a slow cooling section furnace temperature and furnace pressure display 103, a fast cooling section furnace temperature and furnace pressure display 104 and a horizontal turning section furnace temperature and furnace pressure display 105 pass through a small-space strip steel-passing minimum gap in independent areas, the pressure of the whole furnace is measured and displayed, the nitrogen pressure output of a furnace inlet seal 106 is controlled, the sealing performance of the whole furnace is ensured, and the positive pressure control mode of the annealing furnace is. The branch of nitrogen gas pipeline still is connected with mixed three way control valve 204 of nitrogen hydrogen, the mixed three way control valve 204 of nitrogen hydrogen is connected with the hydrogen gas pipeline, through the output of adjusting the mixed hydrogen of mixed three way control valve 204 of nitrogen hydrogen and nitrogen gas, the mixed three way control valve 204 of nitrogen hydrogen and grate nitrogen hydrogen protection gas house steward 205 link to each other, the nitrogen hydrogen protection gas that obtains the required regulation stove atmosphere of annealing stove is carried to the stove nose and is blown through horizontal turning section direction, in proper order through quench zone, slow cooling section, heating section and preheating section. The hydrogen pipe network 3 mainly comprises a hydrogen fast-switching valve 301 and a hydrogen flow rate pressure detection 302 which are connected with a hydrogen main pipe 300, and then the hydrogen is conveyed to a preheating section, a heating section, a slow cooling section, a fast cooling section and a horizontal steering section of the annealing furnace to carry out reduction reaction on iron oxide generated on the surface of strip steel, so that the surface of the strip steel serving as a production material is cleaned, and preparation is made for production of the next procedure.
Referring to the interlocking schematic diagrams of nitrogen flow error or misoperation of the vertical annealing furnace shown in the attached drawings 1 and 2 and fig. 3, in the normal production process, the temperature of the strip steel is higher than 540-860 ℃, the temperature of the annealing furnace is higher than the temperature of the strip steel, and under high temperature, if a nitrogen control system receives serious results caused by misoperation of operators, the interlocking control system formed by connecting the nitrogen fast-cutting valve 201 and a secondary control system 704 of a production line has the advantages that when in normal production, the temperature of the annealing furnace is high, the furnace pressure is normal, the speed of the production line is normal, the oxygen content is normal, the dew point, the coal gas amount and the air-fuel ratio are normal, the adjustment amount of the nitrogen fast-cutting valve 201 is operated by mistake, the secondary control system 704 judges whether the production line is normal, under the normal condition, the input minimum limit adjustment amount is limited under the manual or automatic control mode, and the positive pressure operation of the annealing furnace, as shown in fig. 3, in the nitrogen flow rate error or malfunction interlock condition 400, the operator erroneously controls the nitrogen flow rate regulating valve, the interlock condition determines whether the production line is normal, the malfunction limiting condition 402 operates the detection feedback signal, if the interlock protection 403 is triggered to refuse to execute the operation command normally, and the operator is prompted with the reason for the limitation of the operator, which indicates that the operation fails, ensures the smooth operation of the whole nitrogen system, prevents the serious shutdown accident caused by misoperation, the negative pressure of the annealing furnace is caused by low nitrogen flow at high temperature, a large amount of cold air enters a hearth, the oxygen in the air and high-temperature strip steel generate oxidation reaction, a large amount of iron oxide scales are separated out, the iron oxide scales in the vertical annealing furnace fall to the inside of the hearth and the strip steel, and serious consequences of detection errors occur on detection elements and instruments of the annealing furnace. A large amount of iron scale falls on the surface of the roller in the furnace and adheres to the surface of the roller along with the rotation of the roller, and the iron scale generates friction between the strip steel and the surface of the roller to cause the damage of the surface of the roller. After the program in the interlocking state runs, whether the equipment is in an allowable adjustable variable or can be operated after necessary equipment processing is taken is judged, equipment allowable movable conditions 404 are judged in the interlocking conditions, if the equipment is allowable, the next adjustment is carried out in an adjustment range 406, adjusted parameters are fed back, whether a feedback signal of an adjustment value is normal is judged 407, if the condition is not judged, the fault equipment is listed, an operator is prompted to recover from the equipment fault 405, a next command is allowed after the fault is recovered, and the output of the adjustment range 406 is continued. The method is characterized by comprising the steps of judging whether the production line equipment is normal or not, judging whether the interlock detection of the annealing furnace diffusing equipment is normal or not, normally, displaying preheating section diffusing 107, heating section diffusing 108, slow cooling section diffusing 109 and fast cooling section diffusing 110, displaying preheating section furnace temperature and furnace pressure 101 normally, displaying heating section furnace temperature and furnace pressure 102 normally, displaying slow cooling section furnace temperature and furnace pressure 103 normally, displaying fast cooling section furnace temperature and furnace pressure 104 normally, displaying horizontal turning section furnace temperature and furnace pressure 104 normally, displaying furnace inlet seal 106 normally, enabling the furnace pressure to be at high pressure, and adjusting the nitrogen flow to have an operable allowance.
Referring to attached figures 1, 2 and 4, the interlocking schematic diagram of the vertical annealing furnace for the deceleration stop in case of abnormal nitrogen pipe network pressure or abnormal flow rate according to the present invention includes that the nitrogen abnormality processing 500 includes a detecting element for detecting the nitrogen flow rate pressure 202, the detected data is fed back to the secondary control system, the interlocking protection control module 702 is triggered when the detected data is lower than the minimum range value set by the system or is lower than the warning value of the nitrogen pressure and flow rate, the abnormal flow rate monitoring 501 starts the execution of the interlocking program, the interlocking condition judges whether the production line is normal, the abnormal nitrogen of the annealing furnace causes the abnormal judgment 502 to operate the interlocking condition, the feedback signals of the production line and the annealing furnace are detected, the detected signals are fed back to the interlocking protection control module 702 through the signal acquisition module 703, the signal acquisition module 703 is connected with detection elements and sensors related to nitrogen interlocking control, such as acquisition feedback signal furnace temperature detection 705, furnace pressure detection 706, oxygen content detection 707, dew point detection 708, gas quantity detection 709, air-fuel ratio normal variable detection 710 and the like, which are connected with the signal acquisition module, feeds back real values refreshed from time to an operating system and an interlocking control system, the interlocking program judges that main items have a descending trend, triggers judgment 504 of the pressure trend of the nitrogen pipe network of the annealing furnace to operate, and triggers a prompt to contact with an emergency processing program of peripheral emergency processing 503 operators to perform contact adjustment if other data are detected to be normal, and keeps the pressure and flow of the nitrogen pipe network 2. The judgment 504 of the pressure trend of the nitrogen pipe network of the annealing furnace calculates whether the remaining time of the pressure reduction trend of the nitrogen pipe network from the lowest control standard meets the production conditions, if the condition for triggering the production line to slow down and stop continuously falls below the alarm value meets 506, the production line starts a speed-down stop program and triggers a stop interlocking signal to process the stop, if the judgment 504 of the pressure trend of the nitrogen pipe network of the annealing furnace is triggered and the trend has the remaining time, the operator is prompted to reduce the speed for production, the pressure and flow requirements of the nitrogen pipe network 2 are recovered in a short time in connection with peripheral elimination treatment accidents, the furnace temperature, the oxygen content and the furnace pressure of the annealing furnace are reduced within an effective control range, the production is kept through the reduction of the speed of the production line, the production can be recovered through the recovery of the nitrogen pressure and the flow, after normal production parameters are recovered, the nitrogen interlocking control system operation end 701 can automatically terminate interlocking conditions and feed back the interlocking conditions to the secondary control system.
Referring to attached figures 1, 2 and 5, the interlocking schematic diagram of the abnormal pressure or flow of the nitrogen pipe network of the vertical annealing furnace of the invention is shown, the abnormal handling 600 of nitrogen gas comprises the impact of the pressure and flow of the nitrogen gas system caused by the fluctuation of the external factors to the production line, the detection component for detecting the pressure and flow of the nitrogen gas main pipe is used for detecting the pressure and flow of nitrogen gas 202, the detected data is fed back to the secondary control system, the interlocking protection control module 702 is triggered when the detected data is lower than the minimum range value set by the system or is lower than the warning value of the pressure and flow of nitrogen gas, the monitoring of the pressure and flow of the nitrogen gas pipe network is abnormal 601 in the interlocking condition, the interlocking condition judges whether the production line is normal or not, the abnormal nitrogen gas causes the abnormal judgment 602 to operate the interlocking condition, and the feedback signals, the detection signal is fed back to the interlock protection control module 702 through the signal acquisition module 703, the detection elements and sensors related to nitrogen interlock control, such as the acquisition feedback signal furnace temperature detection 705 connected with the signal acquisition module 703, the furnace temperature high, the furnace pressure detection 706 low, the oxygen content detection 707 high, the dew point detection 708 high, the gas quantity detection 709 normal, the air-fuel ratio normal variable detection 710, feed back the actual value refreshed from time to the operating system and the interlock control system, the interlock program judges that the main item has a large descending trend, triggers the nitrogen pipe network pressure fluctuation large trend judgment 604 to operate, if other data are normal, the nitrogen fluctuation large amount triggers to immediately contact peripheral emergency processing 603 operators to emergently contact peripheral nitrogen abnormity, and the nitrogen can not be provided for various reasons such as peripheral equipment abnormal damage or pipeline external force disconnection, the pressure and flow of the nitrogen pipe network 2 cannot be maintained. The judgment 604 of the great pressure fluctuation trend of the nitrogen pipe network of the annealing furnace calculates that the pressure of the nitrogen pipe network is reduced rapidly and can not meet the continuous production condition, directly triggers an emergency stop signal 606 of the production line after the nitrogen flow rate is lower than the alarm value of the emergency stop of the production line, triggers an emergency stop interlocking signal 607, open emergency start to the equipment of relevant shut down after the scram of production line triggers, for example the annealing stove needs operation stove entry seal roller under high temperature, the backup roll of the interior little roller footpath of stove etc. prevents that the roller from bending deformation under high temperature, close hydrogen gas fast cut valve 301 and nitrogen hydrogen mixture three way control valve 204 immediately, less cold air gets into in the stove and mixes the danger that the back emergence was exploded with hydrogen, start annealing stove coal gas fast cut mode rapid cooling, the very big fan rotational speed of slow cooling section and quench section in the stove, improve the cooling capacity of belted steel, close the opening and stopping of emergency stop equipment such as electric heater in the stove. The alarm residual recoverable predicted time 605 is prompted before the nitrogen pipe network pressure fluctuation major trend judgment 604 of the annealing furnace triggers the emergency stop signal, in order to reduce accident loss, in the shortest time, equipment needing manual operation is arranged and operated by personnel, the accident alarm residual recoverable predicted time 605 is also beneficial to the start of the interlocking protection of some important equipment before the emergency stop production line, the interlocking signal of the more important equipment on the production line, such as the equipment of a polishing machine, a withdrawal straightening machine, a roller coater and the like, can be added into the operation end 701 of the nitrogen interlocking control system in the shortest time, the limited emergency stop signal trigger can be adjusted through the production specification 711 and the production line speed 712, the secondary control system 704 directly executes an operation instruction, and the control instruction of the interlocking protection control module 702 can be continued until all the equipment and the production process after the emergency stop operate normally, the accident is not further expanded, and the emergency procedure of 600 for abnormal handling of nitrogen is terminated after proper handling has been performed.
After emergency shutdown, the air-fuel ratio of gas and air is automatically changed, the feedback of the air-fuel ratio variable detection 710 is detected at any time, and the strip steel in the furnace is rapidly cooled.
The nitrogen humidification system is immediately shut down after the emergency shutdown, so that a large amount of water vapor is prevented from being generated inside the furnace nose, and the feedback value of the dew point detection 708 fed back from time to time is observed.
After the sudden stop signal is triggered, insulation reduction and short circuit tripping accidents of a large amount of iron scales generated in the annealing furnace can be caused to the exposed electric heater, the annealing furnace cannot be put into use, power cut processing is required immediately, power transmission can be recovered after the insulation is tested and meets the conditions after the iron scales are cleaned, and the equipment can be added into the interlocking condition.
After the sudden stop signal is triggered, a large amount of iron oxide scales generated in the annealing furnace damage detection equipment of the deviation correction equipment in the furnace, the detection equipment can be restored after the conditions are met, and the equipment can be added into the interlocking conditions.
Claims (2)
1. An operation method of a nitrogen interlocking control system for detecting the upper and lower oxygen contents of a hot galvanizing vertical annealing furnace is characterized in that each segment in the vertical annealing furnace is provided with an oxygen content detection instrument, the segments are separated by partition walls, gaps for steel strips to pass through are reserved on the partition walls, a quenching section top oxygen content detection (111) and a quenching section bottom oxygen content detection (112) are provided, a slow cooling section top oxygen content detection (113) and a slow cooling section bottom oxygen content detection (114), a heating section top oxygen content detection (115) and a heating section bottom oxygen content detection (116), a preheating section top oxygen content detection (117) and a preheating section bottom oxygen content detection (118) are provided, and only one oxygen content detection point is arranged on a horizontal turning section of the annealing furnace due to small space; the oxygen content data measured by the oxygen content detection instrument are integrated to the oxygen content detection instrument (707) and transmitted to the signal acquisition module (703), the signal acquisition module (703) is connected with the interlocking protection control module (702), the interlocking protection control module (702) is connected with the secondary control system (704), the oxygen content detection instrument measures the oxygen content, the signal acquisition module (703) acquires an oxygen content feedback signal, the interlocking protection control module (702) carries out processing and analysis, the interlocking protection control module (702) is interlocked with the secondary control system (704), when the oxygen content is abnormal, the interlocking protection control module (702) analyzes the abnormal condition and sends a signal to the secondary control system (704), and the secondary control system (704) sends a command of speed reduction production or speed reduction shutdown or quick shutdown or emergency shutdown to the execution component according to the set range of the oxygen content abnormality.
2. The operation method of the nitrogen interlocking control system for detecting the oxygen content on the upper part and the lower part of a hot galvanizing vertical annealing furnace according to claim 1, wherein two oxygen content detection instruments are arranged on the upper part and the lower part of each section, one oxygen content detection instrument is used, and the other oxygen content detection instrument is standby.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910996350.0A CN110699527B (en) | 2019-10-18 | 2019-10-18 | Operation method of nitrogen interlocking control system for detecting oxygen content on hot galvanizing vertical annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910996350.0A CN110699527B (en) | 2019-10-18 | 2019-10-18 | Operation method of nitrogen interlocking control system for detecting oxygen content on hot galvanizing vertical annealing furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110699527A true CN110699527A (en) | 2020-01-17 |
| CN110699527B CN110699527B (en) | 2021-08-27 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111979402A (en) * | 2020-07-31 | 2020-11-24 | 山西太钢不锈钢精密带钢有限公司 | Method for controlling atmosphere in annealing furnace |
| CN113774207A (en) * | 2021-08-31 | 2021-12-10 | 北京科技大学设计研究院有限公司 | Method for controlling protective atmosphere in radiant tube heat treatment furnace |
| CN117025924A (en) * | 2023-09-21 | 2023-11-10 | 中科卓异环境科技(东莞)有限公司 | Safety control system of heat treatment furnace and heat treatment furnace |
| CN117265251A (en) * | 2023-09-20 | 2023-12-22 | 索罗曼(广州)新材料有限公司 | Titanium flat bar oxygen content online monitoring system and method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010255056A (en) * | 2009-04-27 | 2010-11-11 | Daido Steel Co Ltd | Method of controlling furnace atmosphere in heat treatment furnace |
| CN201704359U (en) * | 2010-05-19 | 2011-01-12 | 攀钢集团钢铁钒钛股份有限公司 | Vertical annealing furnace pressure control device |
| CN202440529U (en) * | 2011-12-31 | 2012-09-19 | 海盐华辰工业炉有限公司 | Device for controlling oxygen potential of spheroidizing annealing furnace |
| CN203065577U (en) * | 2013-01-23 | 2013-07-17 | 新余钢铁集团有限公司 | Blueing device for vertical-type continuous annealing furnace |
| EP2670870A1 (en) * | 2011-01-31 | 2013-12-11 | Tata Steel IJmuiden BV | Process for producing high strength steel, and to a steel produced thereby |
| CN203741377U (en) * | 2014-03-15 | 2014-07-30 | 通富热处理(昆山)有限公司 | Control system for oxygen content of annealing furnace |
| CN104342547A (en) * | 2013-07-31 | 2015-02-11 | 宝山钢铁股份有限公司 | Grading type hot blowing method of continuous annealing furnace |
| CN104775019A (en) * | 2015-04-09 | 2015-07-15 | 北京首钢冷轧薄板有限公司 | Continuous annealing furnace cooling section oxygen content automatic detection control system |
-
2019
- 2019-10-18 CN CN201910996350.0A patent/CN110699527B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010255056A (en) * | 2009-04-27 | 2010-11-11 | Daido Steel Co Ltd | Method of controlling furnace atmosphere in heat treatment furnace |
| CN201704359U (en) * | 2010-05-19 | 2011-01-12 | 攀钢集团钢铁钒钛股份有限公司 | Vertical annealing furnace pressure control device |
| EP2670870A1 (en) * | 2011-01-31 | 2013-12-11 | Tata Steel IJmuiden BV | Process for producing high strength steel, and to a steel produced thereby |
| CN202440529U (en) * | 2011-12-31 | 2012-09-19 | 海盐华辰工业炉有限公司 | Device for controlling oxygen potential of spheroidizing annealing furnace |
| CN203065577U (en) * | 2013-01-23 | 2013-07-17 | 新余钢铁集团有限公司 | Blueing device for vertical-type continuous annealing furnace |
| CN104342547A (en) * | 2013-07-31 | 2015-02-11 | 宝山钢铁股份有限公司 | Grading type hot blowing method of continuous annealing furnace |
| CN203741377U (en) * | 2014-03-15 | 2014-07-30 | 通富热处理(昆山)有限公司 | Control system for oxygen content of annealing furnace |
| CN104775019A (en) * | 2015-04-09 | 2015-07-15 | 北京首钢冷轧薄板有限公司 | Continuous annealing furnace cooling section oxygen content automatic detection control system |
Non-Patent Citations (1)
| Title |
|---|
| 何汝迎等: "《不锈钢冷轧生产技术及产品应用》", 31 August 2014, 冶金工业出版社 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111979402A (en) * | 2020-07-31 | 2020-11-24 | 山西太钢不锈钢精密带钢有限公司 | Method for controlling atmosphere in annealing furnace |
| CN113774207A (en) * | 2021-08-31 | 2021-12-10 | 北京科技大学设计研究院有限公司 | Method for controlling protective atmosphere in radiant tube heat treatment furnace |
| CN113774207B (en) * | 2021-08-31 | 2022-11-11 | 北京科技大学设计研究院有限公司 | Method for controlling protective atmosphere in radiant tube heat treatment furnace |
| CN117265251A (en) * | 2023-09-20 | 2023-12-22 | 索罗曼(广州)新材料有限公司 | Titanium flat bar oxygen content online monitoring system and method thereof |
| CN117265251B (en) * | 2023-09-20 | 2024-04-09 | 索罗曼(广州)新材料有限公司 | Titanium flat bar oxygen content online monitoring system and method thereof |
| CN117025924A (en) * | 2023-09-21 | 2023-11-10 | 中科卓异环境科技(东莞)有限公司 | Safety control system of heat treatment furnace and heat treatment furnace |
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