阅读说明：本技术 热镀锌立式退火炉伸缩式迷宫隔离氮气联锁控制系统操作方法 (Operation method of hot galvanizing vertical annealing furnace telescopic labyrinth isolation nitrogen interlocking control system ) 是由 王海 张国堂 林明涛 詹旭 于 2019-10-18 设计创作，主要内容包括：本发明一种热镀锌立式退火炉伸缩式迷宫隔离氮气联锁控制系统,是把退火炉分分区,分区间由隔墙隔开,隔墙留缝隙让钢带通过,缝隙间设有可伸缩的隔离装置,隔离装置与联锁保护控制模块、信号采集模块之间建立信号联锁控制,当退火炉分区异常信号时,隔离装置动作关闭缝隙,使异常的分区隔离,正常的分区保持正压。有益效果：分区隔离加伸缩式隔离装置的结构,分段密封能够及时保持其他各区的炉内压力,将故障损失降低到最小。(The invention relates to a telescopic labyrinth isolation nitrogen interlocking control system for a hot galvanizing vertical annealing furnace, which divides the annealing furnace into zones, the zones are separated by partition walls, gaps are reserved on the partition walls to allow steel strips to pass through, a telescopic isolation device is arranged between the gaps, signal interlocking control is established among the isolation device, an interlocking protection control module and a signal acquisition module, when abnormal signals are sent to the zones of the annealing furnace, the isolation device acts to close the gaps, so that the abnormal zones are isolated, and the normal zones are kept at positive pressure. Has the advantages that: the structure of the telescopic isolating device is added in the partition isolation, the pressure in the furnace of other areas can be kept in time through the partition sealing, and the fault loss is reduced to the minimum.)

1. A method for operating a hot galvanizing vertical annealing furnace telescopic labyrinth isolation nitrogen interlocking control system is characterized in that the telescopic labyrinth isolation divides the annealing furnace into a preheating section, a heating section, a slow cooling section, a rapid cooling section and a horizontal steering section, the divisions are separated by partition walls, gaps are reserved on the partition walls for steel strips to pass through, a structure similar to a labyrinth is formed, isolating devices are arranged between the gaps and respectively comprise an upper telescopic labyrinth isolating device and a lower telescopic labyrinth isolating device, electric driving cylinders are respectively arranged on the upper telescopic labyrinth isolating device and the lower telescopic labyrinth isolating device, the electric driving cylinders act to push upper and lower isolating baffles to tightly seal or open the gaps, the electric driving cylinders are in signal control connection with an interlocking protection control module, the interlocking protection control module is simultaneously connected with a signal acquisition module, signals acquired by the signal acquisition module are received by the interlocking protection control module and then send execution signals for controlling the electric driving cylinders to act, when one or more zones of the annealing furnace have abnormal signals, the electric driving cylinder acts to close the gap, so that the abnormal zones are isolated, and the normal zones keep positive pressure; the nitrogen pressure is interlocked with the furnace pressure, the hydrogen main valve and the production line sudden stop or quick stop, so that the damage to the annealing furnace and other equipment under the abnormal condition of the nitrogen is limited, and the loss is reduced; monitoring the flow and pressure at the nitrogen main valve, monitoring the nitrogen pressure of a sealing roller at the inlet of the annealing furnace, abnormally reducing the furnace pressure of a preheating section, a heating section, a slow cooling section, a quick cooling section and a horizontal steering section, detecting the oxygen content of the annealing furnace, detecting the dew point of the annealing furnace, interlocking the furnace temperature and the nitrogen flow pressure in a high-temperature mode to prevent manual misoperation or wrong stop, controlling the minimum flow and pressure of nitrogen, and ensuring that the furnace pressure prevents cold air from entering the annealing furnace in a safe range; the nitrogen pressure of an annealing furnace inlet sealing roller in an annealing furnace, the furnace pressure of a preheating section, a heating section, a slow cooling section, a quenching section and a horizontal steering section are respectively provided with a detection instrument, the furnace pressure and the change of the nitrogen pressure of the inlet sealing roller are detected, wherein when the actual pressure of one section is lower than the set value pressure, an alarm unit and the opening degree of a nitrogen flow regulating valve are triggered for remedial adjustment, so that the normal furnace pressure is ensured; adjusting the nitrogen flow to the maximum value to influence the production or influence the limiting threshold values of the nitrogen pressure and the flow of a main pipe to be incapable of meeting the production conditions, triggering a shutdown cooling mode, adjusting the air-fuel ratio of a combustion system, reducing the gas flow, increasing the rotating speed of a fan of a cooling section to accelerate the cooling of strip steel, reducing the production line speed or directly shutting down, specifically executing according to the reduction of the actual furnace pressure, if the furnace pressure is reduced quickly and the pressure can not be maintained, a large amount of cold air enters the hearth to cause influence on each section, a production line emergency stop signal is triggered, the threshold value of the furnace pressure is interlocked with the emergency stop or the quick stop of the production line operation to stop the production line in time, so that the phenomenon that a large amount of cold air enters the hearth to generate a large amount of iron oxide scales to pollute important equipment in the hearth and cause equipment damage is prevented, meanwhile, the closing of a hydrogen main valve is controlled, so that the explosion accident caused by the mixing of hydrogen in the nitrogen mixed gas and a large amount of oxygen in the air is avoided.

2. The method for operating a hot dip galvanizing vertical annealing furnace telescopic labyrinth isolation nitrogen interlocking control system according to claim 1, characterized in that the isolation device is provided with a position control encoder with controllable distance, and the accurate control is carried out on strip steel with different thicknesses.

3. The method of claim 1, wherein the upper telescopic labyrinth isolator (1114) is mounted on the upper furnace wall (1112) of the isolation furnace wall, the lower telescopic labyrinth isolator (1115) is mounted on the upper furnace wall (1113) of the isolation furnace wall, and the strip steel (1111) is in a middle position when the telescopic labyrinth isolator is opened.

4. The operating method of the hot galvanizing vertical annealing furnace telescopic labyrinth isolation nitrogen interlocking control system according to claim 1, characterized in that an interlocking protection control module (702) connected with an operating end (701) of the nitrogen interlocking control system is included in the interlocking nitrogen interlocking control system (700), 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), acquired feedback signals connected with the signal acquisition module (703) mainly comprise furnace temperature detection (705), furnace pressure detection (706), oxygen content detection (707), dew point detection (708), gas amount detection (709), air-fuel ratio variable detection (710) and other detection elements and sensors related to nitrogen interlocking control, and real values refreshed at all times are fed back to the operating system and the interlocking control system, the annealing furnace (1) is connected with a secondary control system (704) of the production line and an operation end (701) of the nitrogen interlocking control system to mutually send and transmit monitoring data, so that the normal operation of a nitrogen and hydrogen system of the annealing furnace is ensured.

5. The method for operating the telescopic labyrinth isolation nitrogen interlocking control system of the hot galvanizing vertical annealing furnace according to the claim 1 is characterized in that a nitrogen inlet is provided by a nitrogen header pipe (200) in a nitrogen pipe network (2), the nitrogen inlet is connected with a nitrogen flow pressure detection (202) through a nitrogen fast-switching valve (201) to detect the pressure and the flow of the nitrogen and display the pressure and the flow to an HMI picture or a field instrument display, the nitrogen is conveyed to each area of the annealing furnace (1) and displays the furnace temperature and the furnace pressure, five sections of detection and display are 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), the pressure of the whole furnace chamber is measured and displayed by the smallest gap which is allowed to pass through, and controlling the nitrogen pressure output of the furnace inlet seal (106) of the furnace, ensuring the sealing performance of the whole furnace and maintaining the positive pressure control mode of the annealing furnace.

6. The method for operating the telescopic labyrinth isolation nitrogen interlocking control system of the hot galvanizing vertical annealing furnace according to claim 1, characterized in that the nitrogen fast-switching valve (201) is connected with the secondary control system (704) of the production line to form the interlocking control system, the adjustment quantity of the nitrogen fast-switching valve (201) is operated by mistake under the conditions that the annealing furnace temperature is high, the furnace pressure is normal, the production line speed is normal, the oxygen content is normal, the dew point, the coal gas quantity and the air-fuel ratio are normal during normal production, the secondary control system (704) judges whether the production line is normal, the input minimum limit adjustment quantity is limited under the normal condition no matter in a manual or automatic control mode, the nitrogen supply in the furnace can be ensured to ensure the positive pressure operation of the annealing furnace, the nitrogen flow is wrong or the nitrogen flow control valve is controlled by mistake by an operator under the interlocking condition (400), the interlocking condition judges whether the production line is normal, the misoperation limiting condition (402) runs a detection feedback signal, if so, the interlocking protection (403) is triggered to refuse to execute an operation command, and the limiting reason of an operator is prompted to the operator, so that the operation failure is explained, the smooth running of the whole nitrogen system is ensured, and the serious shutdown accident caused by the misoperation is prevented; after a program in an interlocking state runs, judging whether the equipment is in an allowable adjustable variable or an interlock condition which can allow operation after necessary equipment processing is carried out, judging an equipment allowable movable condition (404), if so, adjusting (406) in an adjusting range to perform next adjustment, feeding back the adjusted parameter, outputting a feedback signal of an adjusting value to judge (407) whether the equipment is normal, if not, listing failed equipment, prompting an operator to recover (405) the equipment from the failure, allowing a next command after the failure is recovered, and executing adjustment (406) in the adjusting range to continue outputting; the method comprises the following steps of judging whether the interlocking detection of the annealing furnace diffusing equipment is normal or not, normally, performing preheating section diffusing (107), heating section diffusing (108), slow cooling section diffusing (109) and fast cooling section diffusing (110), displaying the furnace temperature and furnace pressure of a preheating section (101) normally, displaying the furnace temperature and furnace pressure of a heating section (102) normally, displaying the furnace temperature and furnace pressure of a slow cooling section (103) normally, displaying the furnace temperature and furnace pressure of a fast cooling section (104) normally, displaying the furnace temperature and furnace pressure of a horizontal turning section (104) normally, displaying the sealed furnace inlet (106) normally, keeping the furnace pressure at high pressure, and adjusting the nitrogen flow to have an operable allowance.

Technical Field

The invention belongs to steel mill production equipment, and particularly relates to an operation method of a nitrogen interlocking control system of a hot galvanizing vertical annealing furnace, which is used for protecting the furnace temperature and the plate temperature of the annealing furnace and protecting equipment in a high-temperature state.

Background

The vertical annealing furnace uses the radiant tube to carry out radiant heating under the protection of using the nitrogen-hydrogen protective gas, the leakage problem to the sealed annealing furnace body is serious, after a certain section of the annealing furnace leaks, the pressure maintaining measures or the measures are not adopted timely and effectively, so that a large amount of cold air under the negative pressure of the annealing furnace enters a hearth to cause accident enlargement, important equipment and sensors in the annealing furnace are damaged, and the inestimable loss is caused to the recovery of the furnace.

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 abnormally and erroneously operated, the furnace pressure of the annealing furnace drops, external cold air enters the annealing furnace, the damage to the annealing furnace is great, important equipment such as a refractory material, a lining, a furnace roller and the like of the annealing furnace are impacted firstly, band steel is quickly oxidized, a large amount of iron scales are generated, secondary impact is generated on the roller surface of the furnace roller and an inspection sensor, equipment in the annealing furnace is damaged permanently, the cost of maintenance and repair equipment is high, the maintenance cost is usually higher than that of purchasing new equipment, the construction time is long, the equipment function is reduced below a normal value, and the influence on production and maintenance is great.

The refractory material in the annealing furnace is contacted with cold air at high temperature, the refractory material and water molecules in the air are condensed, and the refractory material is rapidly cooled under thermal expansion to cause different degrees of damage such as shrinkage deformation, cracking and falling, displacement and the like, important equipment or a matrix in the annealing furnace is exposed under the protection of the refractory material, and the important equipment or the matrix material is damaged after losing the protection of the refractory material.

The lining of the annealing furnace is usually made of stainless steel material, and deformation, bulging, local falling, cracking and the like occur in the case of thermal expansion and cold contraction.

The furnace roller of the annealing furnace is subjected to permanent damage such as uneven deformation caused by thermal expansion and cold contraction, bending or irregular deformation, falling of the tungsten carbide material on the roller surface and the like.

The annealing furnace radiant tubes are subjected to thermal expansion and cold contraction deformation and crack, and are used as important heating equipment inside the annealing furnace, if gas leakage can cause an annealing furnace explosion accident, the number of the annealing furnace radiant tubes is more than 100, the gas is required to be stopped during inspection or replacement, the gas supply pipelines are disassembled and connected, the construction amount is large, and the replacement detection time is long.

More serious is that the strip steel in the annealing furnace is rapidly oxidized under the condition of high temperature to generate a large amount of iron scale, the iron scale is concentrated on the upper surface of the strip steel and adhered to the surface of a roller, the friction is generated relative to the running strip steel to cause the tungsten carbide coating on the roller surface of the furnace roller to fall off, the direct damage of the unprotected tungsten carbide coating to the roller surface substrate is generated, the roughness of the roller surface is damaged, only once the iron scale is generated, the damage caused by untimely or untimely shutdown treatment is found to be increased along with the extension of time, the iron scale in the annealing furnace is concentrated and falls to the furnace bottom after being generated, the furnace roller is mainly related to the process design of the vertical annealing furnace, the strip steel is vertically arranged in the furnace, the length of the strip steel is generally more than 400 meters, the large amount of iron scale is concentrated on the furnace bottom, the iron scale is concentrated on a, The connection part of the quenching section and the horizontal steering section is accumulated, and the belt breakage accident is caused when the connection part is serious.

A large amount of iron scale generated in the annealing furnace influences the accuracy of the detection element, a large amount of iron scale dust is adhered to the detection element in the furnace, the influence on instruments such as a thermocouple, a plate thermometer, a pressure gauge, a high-temperature camera, illumination, detection of a deviation correction signal and a gas analyzer is large, the instruments need to be checked again when problems occur, the inspection and replacement period is long, and the cleaning difficulty is large. The iron scale can cause insulation reduction and short circuit trip accidents to the exposed electric heaters, and the iron scale between the electric heaters needs to be cleaned. A large amount of iron scale is adhered to the inner wall of the furnace, the inner space is small, the iron scale is not easy to clean under the unfavorable condition that the height is more than 30 meters, and the safety risk in the cleaning process is large. A large amount of oxidized iron sheets generated in the annealing furnace are brought into a zinc pot and adhered to strip steel, so that subsequent production equipment can be damaged, for example, the roll surfaces of a rubber drying roll, a finishing machine working roll, a withdrawal and straightening machine roll system, a roll coater coating roll and the like are scratched or indented, and periodic product defects are generated. The damaged roller needs to be directly replaced and treated, and the old roller needs to be repaired, ground and cut again.

Disclosure of Invention

In order to solve the problems, the invention provides an operation method of a hot galvanizing vertical annealing furnace telescopic labyrinth isolation nitrogen interlocking control system.

The technical scheme of the invention is as follows: a method for operating a hot galvanizing vertical annealing furnace telescopic labyrinth isolation nitrogen interlocking control system comprises the steps of dividing an annealing furnace into a preheating section, a heating section, a slow cooling section, a quenching section and a horizontal steering section, wherein the divisions are separated by partition walls, the partition walls are provided with gaps for steel strips to pass through to form a structure similar to a labyrinth, isolating devices are arranged among the gaps and respectively comprise an upper telescopic labyrinth isolating device and a lower telescopic labyrinth isolating device, the upper telescopic labyrinth isolating device and the lower telescopic labyrinth isolating device are respectively provided with an electric driving cylinder, the electric driving cylinder acts to push an upper isolating baffle plate and a lower isolating baffle plate to tightly seal or open the gaps, the electric driving cylinder is in signal control connection with an interlocking protection control module, the interlocking protection control module is simultaneously connected with a signal acquisition module, signals acquired by the signal acquisition module are received and judged by the interlocking protection control module to send execution signals for controlling the action of the electric driving cylinder, when one or more zones of the annealing furnace have abnormal signals, the electric driving cylinder acts to close the gap, so that the abnormal zones are isolated, and the normal zones keep positive pressure; the nitrogen pressure is interlocked with the furnace pressure, the hydrogen main valve and the production line sudden stop or quick stop, so that the damage to the annealing furnace and other equipment under the abnormal condition of the nitrogen is limited, and the loss is reduced; monitoring the flow and pressure at the nitrogen main valve, monitoring the nitrogen pressure of a sealing roller at the inlet of the annealing furnace, abnormally reducing the furnace pressure of a preheating section, a heating section, a slow cooling section, a quick cooling section and a horizontal steering section, detecting the oxygen content of the annealing furnace, detecting the dew point of the annealing furnace, interlocking the furnace temperature and the nitrogen flow pressure in a high-temperature mode to prevent manual misoperation or wrong stop, controlling the minimum flow and pressure of nitrogen, and ensuring that the furnace pressure prevents cold air from entering the annealing furnace in a safe range; the nitrogen pressure of an annealing furnace inlet sealing roller in an annealing furnace, the furnace pressure of a preheating section, a heating section, a slow cooling section, a quenching section and a horizontal steering section are respectively provided with a detection instrument, the furnace pressure and the change of the nitrogen pressure of the inlet sealing roller are detected, wherein when the actual pressure of one section is lower than the set value pressure, an alarm unit and the opening degree of a nitrogen flow regulating valve are triggered for remedial adjustment, so that the normal furnace pressure is ensured; adjusting the nitrogen flow to the maximum value to influence the production or influence the limiting threshold values of the nitrogen pressure and the flow of a main pipe to be incapable of meeting the production conditions, triggering a shutdown cooling mode, adjusting the air-fuel ratio of a combustion system, reducing the gas flow, increasing the rotating speed of a fan of a cooling section to accelerate the cooling of strip steel, reducing the production line speed or directly shutting down, specifically executing according to the reduction of the actual furnace pressure, if the furnace pressure is reduced quickly and the pressure can not be maintained, a large amount of cold air enters the hearth to cause influence on each section, a production line emergency stop signal is triggered, the threshold value of the furnace pressure is interlocked with the emergency stop or the quick stop of the production line operation to stop the production line in time, so that the phenomenon that a large amount of cold air enters the hearth to generate a large amount of iron oxide scales to pollute important equipment in the hearth and cause equipment damage is prevented, meanwhile, the closing of a hydrogen main valve is controlled, so that the explosion accident caused by the mixing of hydrogen in the nitrogen mixed gas and a large amount of oxygen in the air is avoided.

The isolation device is provided with a position control encoder with controllable distance, and the accurate control is carried out on the strip steel with different thicknesses.

The upper telescopic labyrinth isolating device is installed on the upper furnace wall of the isolating furnace wall, the lower telescopic labyrinth isolating device is installed on the upper furnace wall of the isolating furnace wall, and the strip steel is in the middle position when the telescopic labyrinth isolating device is opened.

The interlocking protection control module is connected with a secondary control system, the signal acquisition module feeds acquired data back to the interlocking protection control module, acquired feedback signals connected with the signal acquisition module mainly comprise detection elements and sensors related to nitrogen interlocking control, such as furnace temperature detection, furnace pressure detection, oxygen content detection, dew point detection, gas quantity detection, air-fuel ratio variable detection and the like, real values refreshed from time to time are fed back to the operating system and the interlocking control system, and the secondary control system of the annealing furnace connecting production line and the operating end of the nitrogen interlocking control system mutually send and transmit monitoring data to ensure the normal of a nitrogen and hydrogen system of the annealing furnace.

The nitrogen gas is conveyed to each area of the annealing furnace 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, the furnace temperature and the furnace pressure of a preheating section, the furnace temperature and the furnace pressure of a heating section, the furnace temperature and the furnace pressure of a slow cooling section, the furnace temperature and the furnace pressure of a rapid cooling section and the furnace temperature and the furnace pressure of a horizontal turning section are displayed, the pressure of the whole furnace hearth is measured and displayed through a small-space minimum gap of strip steel, the nitrogen gas pressure output of the furnace inlet seal is controlled, the sealing performance of the whole furnace is ensured, and the positive pressure control mode of the annealing furnace is maintained.

The nitrogen fast-switching valve is connected with a secondary control system of the production line to form an interlocking control system, the adjustment quantity of the nitrogen fast-switching valve is operated by mistake under the conditions that 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 quantity and the air-fuel ratio are normal during normal production, the secondary control system can judge whether the production line is normal, the input minimum limit adjustment quantity is limited no matter in a manual or automatic control mode under the normal condition, the nitrogen supply in the furnace can ensure the positive pressure operation of the annealing furnace, as shown in figure 3, in the condition of wrong nitrogen flow or wrong operation interlocking, an operator controls the nitrogen flow regulating valve by mistake, the interlocking condition judges whether the production line is normal, the condition of wrong operation runs a detection feedback signal, if the interlocking protection is triggered normally to refuse to execute an operation command, the reason for limiting the operators is prompted to the operators, the operation failure is explained, the smooth operation of the whole nitrogen system is ensured, and the serious shutdown accident caused by misoperation is prevented; and after the program in the interlocking state runs, judging whether the equipment is in an allowable adjustable variable or in an interlocking condition which can allow operation after necessary equipment processing, judging whether the equipment allows a movable condition, if so, adjusting in an adjusting range to execute the next step of adjustment, feeding back the adjusted parameter, outputting a feedback signal of an adjusting value to judge whether the equipment is normal, if not, listing the fault equipment, prompting an operator to recover the equipment from the fault, and allowing the next command after the fault is recovered to execute the adjustment in the adjusting range to continue outputting. The method mainly comprises the following steps of judging whether the production line equipment is normal or not, detecting whether the interlocking of annealing furnace diffusing equipment is normal or not, normally, diffusing a preheating section, diffusing a heating section, diffusing a slow cooling section, diffusing a rapid cooling section, displaying and displaying the furnace pressure of the preheating section normally, displaying and displaying the furnace pressure of the heating section normally, displaying and displaying the furnace pressure of the slow cooling section normally, displaying and displaying the furnace pressure of the rapid cooling section normally, displaying and displaying the furnace pressure of the horizontal turning section normally, displaying and displaying the furnace pressure of a furnace inlet normally, displaying the furnace pressure at high pressure, and adjusting the nitrogen flow to have an operable allowance.

The invention has the beneficial effects that: the structure of partition isolation and the telescopic isolation device can maintain the pressure in the furnace of other areas in time through the partition sealing, so that the fault loss is reduced to the minimum; independent segment seal can also the danger of explosion takes place owing to the oxygen in the air mixes with the hydrogen in the nitrogen hydrogen protective gas in the effectual control high temperature region, reduces the risk of safety in production, guarantees producers' personal safety, reduces the emergence of incident. The telescopic labyrinth is adopted for isolation, so that the influence on high-temperature strip steel can be effectively prevented, the contact pressure of the isolation baffle and the strip steel is lower, the strip steel is prevented from being deformed and bent by large force in a hot state, the adverse influence on subsequent production is reduced, and the difficulty in handling accidents is reduced. The multi-interval labyrinth mode is beneficial to isolating furnace gas in the shortest time and preventing small gaps from leaking slowly to lose the sealing effect.

Drawings

FIG. 1 is a schematic view of a vertical annealing furnace nitrogen control system of the present invention;

FIG. 2 is a schematic view of the telescopic labyrinth isolation structure of the vertical annealing furnace of 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;

FIG. 6 is an enlarged view of the vertical isolation device of the present invention open and closed;

description of the symbols: 1. an annealing furnace, 100 annealing furnace bodies, 101, preheating section furnace temperature furnace pressure display, 102, heating section furnace temperature furnace pressure display, 103, slow cooling section furnace temperature furnace pressure display, 104, fast cooling section furnace temperature furnace pressure display, 105, horizontal turning section furnace temperature furnace pressure display, 106, furnace inlet sealing, 107, preheating section diffusing, 108, heating section diffusing, 109, slow cooling section diffusing, 110, fast cooling section diffusing, 111, fast cooling section telescopic labyrinth isolating, 112, slow cooling section telescopic labyrinth isolating, 113, heating section telescopic labyrinth isolating, 114, preheating section telescopic labyrinth isolating, 1110, fast cooling section telescopic labyrinth isolating opening position local enlarging image, 1111, strip steel, 1112, upper furnace wall, 1113, lower furnace wall, 1114, upper telescopic labyrinth isolating, 1115, lower telescopic labyrinth isolating, 1110', segment telescopic labyrinth isolating position local enlarging image, 2, nitrogen pipe network, 200. nitrogen main pipe, 201, nitrogen fast-switching valve, 202, nitrogen flow pressure detection, 203, nitrogen flow pressure display, 204, nitrogen-hydrogen mixed three-way regulating valve, 205, grate nitrogen-hydrogen protective gas main pipe, 3, hydrogen pipe network, 300, hydrogen main pipe, 301, hydrogen fast-switching valve, 302, hydrogen flow pressure detection, 303, hydrogen flow pressure display, 400, nitrogen flow error or misoperation interlocking condition, 401, nitrogen flow regulating valve, 402, misoperation limiting condition, 403, trigger interlocking protection, 404, equipment permission movable condition, 405, fault recovery, 406, regulation within regulation range, 407, feedback signal judgment of regulating value, 500, nitrogen abnormity processing, 501, nitrogen pipe network pressure and flow monitoring abnormity, 502, annealing furnace nitrogen abnormity causing abnormity judgment, 503, prompting to contact peripheral emergency processing, 504, annealing furnace nitrogen pipe network pressure trend judgment, 505. prompting deceleration production, 506, meeting the conditions of deceleration shutdown of a production line, 507, triggering shutdown interlocking signals, 600, abnormal treatment of nitrogen, 601, abnormal monitoring of pressure and flow of a nitrogen pipe network, 602, abnormal judgment caused by abnormal nitrogen of an annealing furnace, 603, immediately associating with peripheral emergency treatment, 604, judgment of large pressure fluctuation trend of the nitrogen pipe network of the annealing furnace, 605, alarm residual recoverable prediction time, 606, emergency shutdown of the production line, 607, triggering emergency shutdown interlocking signals, 700, a nitrogen interlocking control system, 701, an operation end of the nitrogen interlocking control system, 702, an interlocking protection control module, 703, a signal acquisition module, 704, a secondary control system, 705, furnace temperature detection, 706, furnace pressure detection, 707, oxygen content detection, 708, dew point detection, 709, gas quantity detection, 710, air-fuel ratio variable detection, 711, production specifications, 712, dew point detection, 709, gas quantity detection, 710, air-fuel ratio, Line speed 713, production at reduced speed 714, shutdown at reduced speed 715, shutdown at rapid speed 716, emergency shutdown.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

A nitrogen interlocking control system is isolated by a telescopic labyrinth of a hot galvanizing vertical annealing furnace, the telescopic labyrinth is isolated by partitioning the annealing furnace into a preheating section, a heating section, a slow cooling section, a rapid cooling section and a horizontal steering section, the partitions are separated by partition walls, gaps are reserved on the partition walls for steel strips to pass through, a structure similar to a labyrinth is formed, an isolating device is arranged between the gaps, a position control encoder with controllable distance is installed on the isolating device, the isolating device is respectively an upper telescopic labyrinth isolating device and a lower telescopic labyrinth isolating device, both the upper telescopic labyrinth isolating device and the lower telescopic labyrinth isolating device are provided with electric driving cylinders, the electric driving cylinders act to push upper and lower isolating baffles to tightly seal or open the gaps, the electric driving cylinders are in signal control connection with an interlocking protection control module, and the interlocking protection control module is simultaneously connected with a signal acquisition module, the signal acquired by the signal acquisition module is received and judged by the interlocking protection control module and then sends out an execution signal for controlling the action of the electric driving cylinder, when one or more zones of the annealing furnace have abnormal signals, the electric driving cylinder acts to close the gap, so that the abnormal zones are isolated, and the normal zones keep positive pressure. The signal acquisition module acquires signals such as temperature, furnace pressure, production line speed, oxygen content, dew point, coal gas amount, air-fuel ratio and the like through sensors, the signals are sent to the interlocking protection control module, the interlocking protection control module processes the signals and sends execution signals to the electric driving cylinder, the sensors acquire the signals and send the signals to the processor module for processing,

the program that signals the execution unit to perform the actions can be obtained from the prior art.

When in normal production, the furnace temperature and the strip steel temperature of the annealing furnace are high, the furnace pressure of the preheating section, the heating section, the slow cooling section, the rapid cooling section and the horizontal steering section of the annealing furnace is abnormal, if the furnace pressure is only in a sudden drop of a certain section, for example, the furnace pressure is suddenly dropped due to the sealing damage of the furnace bottom cover or the breakage of the furnace bottom cover pressing bolt in the preheating section, the production condition can not be met, the machine needs to be stopped immediately for treatment, and the whole machine can not work. The telescopic labyrinth isolation device is used, the isolation effect is reliable, the influence on high-temperature strip steel can be effectively prevented by adopting telescopic labyrinth isolation, the contact pressure of the isolation baffle plate and the strip steel is low, the strip steel is prevented from being deformed and bent by large force in a hot state, the adverse influence on subsequent production is reduced, and the difficulty in handling accidents is reduced. The multi-interval labyrinth mode can gradually reduce the pressure of each interval, realize the main sealing function of the telescopic labyrinth isolation method, is favorable for isolating furnace gas in the shortest time, and prevents the slow leakage of small gaps from losing the sealing effect. In order to prevent the air pressure of other partitions in the furnace from losing through the segmentation points after the furnace pressure of the preheating section is reduced, sealing equipment is arranged at the segmentation points, so that the pressure loss of other sections is stopped and reduced, and the cold air is prevented from entering other sections of oxidized high-temperature strip steel to generate a large amount of iron scales to damage equipment in the furnace. The temperature of the strip steel in the preheating section is lower and is generally 200 ℃, the probability of generating iron scale is extremely low, the most main high-temperature zone of the strip steel is in the heating section and the cooling section, the quenching section and the horizontal turning section, and the pressure in the furnaces of other zones can be timely maintained by adopting sectional sealing, so that the fault loss is reduced to the minimum. Independent segment seal can also the danger of explosion takes place owing to the oxygen in the air mixes with the hydrogen in the nitrogen hydrogen protective gas in the effectual control high temperature region, reduces the risk of safety in production, guarantees producers' personal safety, reduces the emergence of incident.

The nitrogen pressure is interlocked with the furnace pressure, the hydrogen main valve and the production line sudden stop or quick stop, so that the damage to the annealing furnace and other equipment under the abnormal condition of the nitrogen is limited, and the loss is reduced. Monitoring the flow and pressure at the nitrogen main valve, monitoring the nitrogen pressure of a sealing roller at the inlet of the annealing furnace, abnormal reduction of furnace pressure of a preheating section, a heating section, a slow cooling section, a rapid cooling section and a horizontal steering section, detection of oxygen content of the annealing furnace, detection of dew point of the annealing furnace, interlocking of furnace temperature and nitrogen flow pressure in a high-temperature mode to prevent manual misoperation or wrong stop, controlling the minimum flow and pressure of nitrogen, ensuring that the furnace pressure is in a safe range, and preventing cold air from entering the annealing furnace. The method comprises the steps of detecting the nitrogen pressure of an annealing furnace inlet sealing roller in an annealing furnace, detecting the change of the furnace pressure and the nitrogen pressure of the inlet sealing roller in each section of a preheating section, a heating section, a slow cooling section, a rapid cooling section and a horizontal steering section, triggering an alarm unit and the opening degree of a nitrogen flow regulating valve to carry out remedial adjustment when the actual pressure of one section is lower than a set value pressure, ensuring that the furnace pressure is normal, regulating the nitrogen flow to the maximum value to influence the production or can influence the limit threshold value of the nitrogen pressure and the flow of a main pipe and cannot meet the production condition, triggering a shutdown cooling mode, regulating the air-fuel ratio of a combustion system, reducing the gas flow, increasing the rotating speed of a fan of a cooling section to accelerate the cooling of strip steel, reducing the speed of a production line or directly shutting down the production line, specifically executing according to the reduction of the actual furnace pressure, causing each segment to be affected and triggering a production line emergency stop signal. The threshold value of furnace pressure and the scram or the stop soon of production line operation carry out the interlocking, in time stop the production line, prevent that a large amount of cold air from getting into furnace, produce a large amount of iron scale to the pollution of important equipment in the furnace and cause the equipment to damage, what trigger simultaneously also has the control that the hydrogen main valve closed, stop the explosion accident that takes place after hydrogen in the nitrogen gas mixture mixes with a large amount of oxygen in the air.

The annealing furnace 1 is a large-scale device of a continuous hot galvanizing production line, is a main device integrating the detection and control functions based on a heating device and a plurality of instruments, and mainly performs recrystallization annealing and surface residual oil and residual iron oxidation reduction on production materials, and comprises a sealed medium pipeline assembly (the invention is mainly provided by interlocking a nitrogen system and a hydrogen system, and the others are omitted) at the periphery of a furnace body 100 of the annealing furnace, and the pressure maintaining of the annealing furnace consisting of a nitrogen pipe network 2 and a hydrogen pipe network 3 and the control of the atmosphere in the furnace provided by a grate nitrogen-hydrogen protective gas main pipe 205. The hot galvanizing vertical annealing furnace has higher requirements on the control of the temperature in the furnace and the atmosphere in the furnace, and great accidents can be caused by abnormal operation or abnormal nitrogen. Under the normal production state, the minimum control quantity of 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 speed, the nitrogen system slowly reduces and can have recoverable 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. Referring to the attached drawings 1 and 2, the invention provides a telescopic labyrinth isolation nitrogen interlocking control system of a hot galvanizing vertical annealing furnace, which is mainly added with an interlocking protection control module 702 connected with an operation end 701 of the nitrogen interlocking control system in the nitrogen interlocking control system 700 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 a furnace temperature detection 705, a furnace pressure detection 706 and an oxygen content detection 707, the actual values refreshed from time to time are fed back to the operating system and the interlock control system by using detection elements and sensors related to nitrogen interlock control, such as a dew point detection 708, a gas amount detection 709, an air-fuel ratio variable detection 710, and the like. The annealing furnace 1 is connected with a secondary control system 704 of the production line and an operation end 701 of the nitrogen interlocking control system to mutually send and transmit monitoring data, so that 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 the condition that the normal production of the production line is impacted by the pressure fluctuation or abnormal reduction or stop 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 furnace atmosphere of annealing stove is carried and is blown to the grate in 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.

The furnace is provided with a telescopic labyrinth isolating device with a buffering effect, the preheating section, the heating section, the slow cooling section, the quenching section and the horizontal steering section are separated by partition walls, the partition spaces are sealed by the isolating device with a telescopic structure, the quenching section telescopic labyrinth is isolated 111, the slow cooling section telescopic labyrinth is isolated 112, the heating section telescopic labyrinth is isolated 113, and the preheating section telescopic labyrinth is isolated 114. Isolation device can be individuality or all carry out quick response drive under the accident situation, open or close telescopic labyrinth isolation device under the shutdown state, for example only the sealed problem that appears of quench zone, other sections stove pressure is normal, can close to telescopic labyrinth isolation device around the quench zone after shutting down, the stove pressure that does not influence other sections influences this region that appears the problem, if after cold air gets into the quench zone, only produce behind the high volume of iron scale of production of belted steel temperature in the quench zone, do not influence other regions, if the processing time is shorter, oxygen content in the cold air is lower, the influence is little, can also carry out the start-up operation in the shortest time, shorten accident handling time.

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 grate, and the feedback value of the dew point detection 708 fed back from time to time is observed.

Referring to the attached drawings 1, 2 and 6, the present invention relates to an enlarged view of the opening and closing of a telescopic labyrinth insulator of a vertical annealing furnace, which is a partially enlarged view 1110 of the opening position of the telescopic labyrinth insulator of a quenching section and a partially enlarged view 1110' of the closing position of the telescopic labyrinth insulator of a quenching section, wherein the telescopic labyrinth insulator must be opened during normal production or strip steel operation to prevent strip steel breakage accidents caused by strip steel running after closing, the telescopic labyrinth insulator is provided with an electric driving cylinder for driving, a position control encoder with controllable distance is arranged for accurately controlling the strip steel with different thicknesses, an upper telescopic labyrinth insulator 1114 is arranged on an upper furnace wall 1112 of the insulating furnace wall, a lower telescopic labyrinth insulator 1115 is arranged on an upper furnace wall 1113 of the insulating furnace wall, and the strip steel 1111 is in a middle position when the telescopic labyrinth insulator is opened, during production, proper tension is set to tension the strip steel, the strip steel is kept straight to pass through the isolating device, and equipment such as an air cylinder without position control cannot be installed, so that large pressure is directly applied to the strip steel with high temperature to generate bending deformation, and the subsequent production quality is influenced.

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.

According to production and equipment faults caused by abnormal production lines or misoperation in the normal production period or abnormal fluctuation of a nitrogen system, different production lines have different equipment and different functions, and influence factors are changed accordingly.

Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.