Efficient and energy-saving strip steel continuous annealing furnace profile structure and production control method

Abstract

The invention relates to the technical field of strip steel annealing, and discloses an efficient and energy-saving strip steel continuous annealing furnace profile structure which comprises a furnace body, a preheating section, a first heating section, a second heating section, a third heating section and a fourth heating section are sequentially arranged in the furnace body from the furnace head to the furnace tail, and the preheating section and the first heating section are fully communicated. A furnace front supporting roller is arranged at the furnace head of the furnace body, a preheating supporting roller is arranged in the preheating section, lifting supporting roller sets are arranged in the first heating section, the second heating section and the third heating section, disc rollers are arranged in the fourth heating section and the furnace tail of the furnace body, a smoke exhaust fan is arranged at the top of the furnace body, one end of the smoke exhaust fan communicates with the preheating section, and the other end of the smoke exhaust fan communicates with the preheating section. One end of the preheating section is connected with the furnace body, the other end of the preheating section is connected with the smoke exhaust pipe and used for enabling waste gas in the furnace body to enter the preheating section, a plurality of furnace pressure gauges are arranged on the furnace body, and the preheating section, the first heating section, the second heating section, the third heating section and the fourth heating section correspond to at least one furnace pressure gauge. The back-up roll in the generation furnace deforms at high temperature, roll body nodules are generated, and the press-in defect of the roll in the furnace is extremely low.

Description

Technical Field

[0001] The invention relates to the technical field of strip steel annealing, and in particular to a furnace structure and a production control method of a high-efficiency and energy-saving strip steel continuous annealing furnace. Background Art

[0002] As the global energy crisis such as natural gas intensifies, energy conservation and emission reduction in the steel industry is imperative. In the production and manufacturing of stainless steel, titanium, carbon steel and other steel strips, natural gas is widely used as fuel in the continuous heat treatment process; among them, the continuous horizontal annealing furnace is a commonly used plate and strip heat treatment equipment for stainless steel, titanium, carbon steel and other materials. At present, the continuous horizontal annealing furnace adopts a full disc roller or full internal furnace support roller mode, and the traditional full disc roller mode design requires a large amount of roller (disc roller + support roller) cold circulation water, and the water flow process is long, requiring a large power circulation pump and head, especially in the summer of recent years. The continuous high temperature (≥40℃) environment, the cooling effect is poor, which easily leads to the bending and deformation of the online support roller due to the excessively high cooling water temperature (≥50℃) and the roller pressing defect in the furnace, which has a great impact on the production quality and equipment. Compared with the full in-furnace support roller mode, the in-furnace support rollers in the high-temperature and high-pressure heating section are extremely susceptible to nodules on the roller surface and in-furnace roller indentation defects when the production process speed drops sharply. Especially if nodules and in-furnace roller indentation defects occur on both in-furnace support rollers, a lot of time will be required to replace new rollers and low-load and low-output production will be required, which will inevitably have a serious impact on production quality, capacity and equipment. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a high-efficiency and energy-saving strip steel continuous annealing furnace structure and a production control method to solve the deficiencies of the prior art.

[0004] The objective of the present invention is achieved through the following technical solutions: A high-efficiency and energy-saving strip continuous annealing furnace structure, comprising a furnace body, wherein a preheating section, a heating section, a second heating section, a third heating section and a fourth heating section are arranged in sequence from the furnace head to the furnace tail in the furnace body, the preheating section and the first heating section are fully connected, a furnace front support roller is arranged at the furnace head of the furnace body, a preheating support roller is arranged in the preheating section, a lifting support roller group is arranged in the first heating section, the second heating section and the third heating section, a disc roller is arranged in the fourth heating section and at the furnace tail of the furnace body, a smoke exhaust fan is arranged on the top of the furnace body, one end of the smoke exhaust fan is connected to the preheating section, and the other end is connected to the smoke exhaust pipe, which is used to allow the exhaust gas in the furnace body to enter the preheating section, and a plurality of furnace pressure gauges are arranged on the furnace body, and the preheating section, the first heating section, the second heating section, the third heating section and the fourth heating section each correspond to at least one furnace pressure gauge.

[0005] Furthermore, a plurality of oxygen analyzers are arranged on the furnace body, and each of the preheating section, heating section one, heating section two, heating section three and heating section four corresponds to at least one oxygen analyzer. The horizontal elevation of the furnace head of the furnace body is a sloping furnace top structure with a height of 1000mm relative to the horizontal elevation of the furnace tail.

[0006] Furthermore, the furnace tail of the furnace body adopts a heat-resistant structure, which extends to the rear of the disc roller and covers the top of the disc roller. The heat-resistant structure includes a stainless steel shell, an insulation board and a special-shaped insulation module. The insulation board is installed on the inner wall of the stainless steel shell, and the special-shaped insulation module is installed on the insulation board. The stainless steel shell, the insulation board and the special-shaped insulation module are connected by anchoring nails.

[0007] Furthermore, a smoke dust removal mechanism is provided in the smoke exhaust pipe, and the end of the smoke exhaust pipe away from the furnace body is connected to the emission pipe, and a circulation pipe is provided between the emission pipe and the smoke exhaust fan, one end of the circulation pipe is connected to the smoke exhaust pipe, and the other end is connected to the preheating section from the bottom of the furnace body, and the smoke dust removal mechanism includes an upper dust removal ring and a lower dust removal ring, the top of the lower dust removal ring is provided with a plurality of lower dust removal wires along its length direction, and the bottom of the upper dust removal ring is provided with a plurality of upper dust removal wires along its length direction, and the upper dust removal ring is connected to the lower dust removal ring by screws, so as to make the lower dust removal wires contact with the upper dust removal wires to form a mesh dust removal net.

[0008] Furthermore, the upper dust removal ring includes a left half ring and a right half ring, both ends of the opening of the left half ring are connected to the two ends of the opening of the right half ring through a bellows, and both ends of the upper dust removal wire are respectively connected to the left half ring and the right half ring, and a telescopic mechanism is arranged between the left half ring and the right half ring, and the telescopic mechanism includes a fixed column, a sliding column and a screw, one end of the fixed column is connected to the middle part of the inner wall of the left half ring, and the other end is provided with a rectangular groove, the screw is arranged in the rectangular groove and rotatably connected to the left half ring, one end of the sliding column is slidably adapted in the rectangular groove, and the other end is connected to the middle part of the inner wall of the right half ring, the sliding column is threadedly mounted on the screw, the outer wall of the left half ring is provided with an operating groove, and one end of the screw extends into the operating groove and is provided with an inner hexagonal groove.

[0009] Furthermore, the lower dust removal ring is installed in the smoke exhaust pipe through a detachable connecting component, and the detachable connecting component includes a movable steel ball and a rotating locking ring. The outer wall of the lower dust removal ring is evenly distributed with a plurality of conical holes along its own circumferential direction, and the large diameter end of the conical hole is arranged close to the smoke exhaust pipe, and a movable hole is opened on the side wall of the smoke exhaust pipe at a position corresponding to the conical hole, and the movable hole includes a large diameter hole and a small diameter hole that are coaxially connected, and the movable steel ball is movably adapted in the large diameter hole, and the rotating locking ring is rotatably mounted on the smoke exhaust pipe, and each of the movable holes is correspondingly provided with an arc groove, and the arc groove is coaxially opened on the inner wall of the rotating locking ring, and both end surfaces of the arc groove are arranged as inclined surfaces, and when the movable steel ball partially passes through the small diameter hole and is adapted in the conical hole, the movable steel ball contacts the inner side wall of the rotating locking ring, and when the movable steel ball contacts the inner side wall of the arc groove, the movable steel ball detaches from the conical hole.

[0010] Furthermore, the rotating locking ring is composed of two half locking rings connected by bolts, the fixed sleeve on the smoke exhaust pipe is provided with two graphene sealing rings, the movable hole is located between the two graphene sealing rings, and the inner wall of the rotating locking ring is provided with two annular sealing grooves, the axial width of the annular sealing grooves gradually decreases in the direction away from the center of the rotating locking ring, and the graphene sealing ring is interference fit in the annular sealing groove.

[0011] Furthermore, a sprocket is mounted on the rotating lock ring, and a motor is arranged away from the furnace body. The output shaft of the motor is connected to a driving sprocket, and the driving sprocket is connected to the sprocket through a chain transmission.

[0012] Furthermore, a positioning rod is fixed to the bottom of the rotating locking ring, and a first mechanical limit block and a second mechanical limit block are fixed to the top of the furnace body, and the positioning rod is located between the first mechanical limit block and the second mechanical limit block. When the positioning rod contacts the first mechanical limit block, the movable steel ball is partially adapted in the conical hole, and when the positioning rod contacts the second mechanical limit block, the movable steel ball is separated from the conical hole.

[0013] A highly efficient and energy-saving production control method for a strip steel continuous annealing furnace. During normal and stable production: the furnace tail pressure gauge of the furnace body is controlled to set a target value of +40Pa; the oxygen content in the furnace body is controlled to set a target value of: preheating stage: 2.5%, heating stage 1, heating stage 2, heating stage 3: 2%; heating stage 4: 1.5%;

[0014] When the temperature drops rapidly due to abnormal production conditions: the furnace pressure gauge at the furnace tail of the furnace body is controlled to set the target value: 0Pa;

[0015] When the production speed increases abnormally: the furnace pressure gauge at the furnace tail of the furnace body is set to the target value: +40Pa; the oxygen content in the furnace body is set to the target value: preheating stage: 3%, heating stage 1, heating stage 2, heating stage 3: 2%; heating stage 4: 2.5%;

[0016] When the temperature rises abnormally quickly during production: the target value of the furnace pressure gauge at the furnace tail of the furnace body is set to +30Pa; the target value of the oxygen content in the furnace body is set to: preheating stage: 3-5%, heating stage 1, heating stage 2, heating stage 3: 2-4%; heating stage 4: 2-3%;

[0017] When the furnace roller pressure defect occurs during the abnormal rapid speed reduction of production, or the cooling circulating water temperature of the furnace roller is too high, the control measures are as follows: first adjust the furnace pressure to the target value: -5~-15Pa, reduce the process speed to ≤35m / min, and switch the disc roller online: rotate the disc roller along the running direction, and turn the strip steel support roller on the offline disc roller to the online position, and the corresponding original online support roller is turned to the offline position; at the same time, increase the net circulating cooling water flow on the other side of the cooling circulating water cooling heat exchange, increase its heat exchange capacity, and make the inlet water temperature <20℃, and the reflux temperature ≤35℃, and then confirm whether the above undesirable conditions have been eliminated. If they have been eliminated, gradually resume production; if the above undesirable conditions have not been eliminated, proceed to the next step:

[0018] Adjust the furnace pressure to the target value: -10 ~ -25Pa, reduce the process speed to ≤30m / min, and then switch the lifting support rollers in the furnace one by one from the back to the front, and confirm the effects after switching one by one until the above adverse conditions are eliminated. For this purpose, the switched support rollers are then inspected offline or taken out and replaced with new spare rollers.

[0019] The beneficial effects of the present invention are:

[0020] Compared with the full disc roller furnace type, it can save the cost of 3 sets of disc rollers, and can conveniently and efficiently realize the switching of strip support rollers in the high temperature zone (heating stages three and four). All strip support rollers use less cooling water, the flow rate is faster, and the water temperature can be flexibly and adjustable: the inlet water temperature is less than 25°C, the reflux temperature is ≤40°C, the high-temperature deformation of the support rollers in the furnace, the nodules on the roller body, and the indentation defects of the rollers in the furnace are extremely low, and the power used by the smoke exhaust fan is only 70-80% of that of the traditional furnace type. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the internal structure of a high-efficiency and energy-saving strip steel continuous annealing furnace structure of the present invention;

[0022] Figure 2 It is a schematic diagram of a heat-resistant structure in a furnace structure of a high-efficiency and energy-saving strip steel continuous annealing furnace of the present invention;

[0023] Figure 3It is a schematic diagram of the partial structure of a smoke exhaust pipe in a furnace structure of a high-efficiency and energy-saving strip steel continuous annealing furnace of the present invention;

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0025] Figure 5 It is a structural schematic diagram of an upper dust removal ring in a furnace structure of a high-efficiency and energy-saving strip steel continuous annealing furnace of the present invention;

[0026] Figure 6 It is a structural schematic diagram of a telescopic mechanism in a furnace structure of a high-efficiency and energy-saving strip steel continuous annealing furnace of the present invention;

[0027] Figure 7 It is a partial cross-sectional view of a rotating lock ring in a furnace structure of a high-efficiency and energy-saving strip steel continuous annealing furnace of the present invention;

[0028] In the figure, 1-furnace body, 2-furnace front support roller, 3-preheating support roller, 4-support roller group, 5-disc roller, 6-exhaust pipe, 7-exhaust fan, 8-furnace pressure gauge, 9-oxygen analyzer, 10-stainless steel shell, 11-insulation board, 12-special-shaped insulation module, 13-anchor nail, 14-circulation pipe, 15-upper dust removal ring, 16-lower dust removal ring, 17-lower dust removal wire, 18-upper dust removal wire, 19-left half ring, 20-right half ring , 21-fixed column, 22-sliding column, 23-screw, 24-rectangular groove, 25-operating groove, 26-moving steel ball, 27-rotating locking ring, 28-cone hole, 29-arc groove, 30-large diameter hole, 31-small diameter hole, 32-sprocket, 33-positioning rod, 34-first mechanical limit block, 35-second mechanical limit block, 36-bellows, 37-annular sealing groove, 38-positioning ring, 39-graphene sealing ring. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0030] like Figures 1 to 7As shown, a high-efficiency and energy-saving continuous annealing furnace structure of strip steel comprises a furnace body 1, wherein a preheating section, a heating section 1, a heating section 2, a heating section 3 and a heating section 4 are arranged in sequence from the furnace head to the furnace tail in the furnace body 1, the preheating section and the heating section 1 are fully connected, a furnace front support roller 2 is arranged at the furnace head of the furnace body 1, a preheating support roller 3 is arranged in the preheating section, a lifting support roller group 4 is arranged in the heating section 1, the heating section 2 and the heating section 3, a disc roller 5 is arranged in the heating section 4 and at the furnace tail of the furnace body 1, and a smoke exhaust fan 7 is arranged on the top of the furnace body 1, one end of the smoke exhaust fan 7 is connected to the preheating section, and the other end of the smoke exhaust fan 7 is connected to the preheating section. One end is connected to the smoke exhaust pipe 6, which is used to allow the exhaust gas in the furnace body 1 to enter the preheating section. The furnace body 1 is provided with a plurality of furnace pressure gauges 8. The preheating section, the first heating section, the second heating section, the third heating section and the fourth heating section each correspond to at least one furnace pressure gauge 8, which is used to detect the airflow pressure in each area of ​​the furnace. The stainless steel, titanium and carbon ribbons that need annealing heat treatment enter the furnace from the furnace front support roller 2 of the furnace body 1, and are supported by the preheating support roller 3, the lifting support roller group 4 and the disc roller 5 to move forward through the furnace. In the process of passing through the furnace body 1, the ribbons are After being heated to the required annealing heat treatment temperature, it is taken out of the furnace and enters the cooling process of annealing heat treatment; a plurality of oxygen analyzers 9 are arranged on the furnace body 1, and each of the preheating section, the first heating section, the second heating section, the third heating section and the fourth heating section corresponds to at least one oxygen analyzer 9, which is used to detect the residual oxygen content in the exhaust gas after combustion in each area of ​​the furnace; the preheating section is a non-open flame heating section, which mainly utilizes the exhaust gas generated by the combustion of the burners in each area of ​​the first heating section and the second heating section to conduct convection preheating of the stainless steel, titanium and carbon ribbons through the natural flow of the flue gas and the exhaust action of the exhaust fan 7. The ribbon can be preheated to a maximum of 6 00℃, at the same time, part of the exhaust gas is introduced into the contact strip from the bottom of the preheating section through the smoke exhaust pipe 6, so that the preheating of the strip is more uniform, and the waste heat is recycled to improve the energy utilization rate; in the heating section one, heating section two, heating section three and heating section four, high-power direct combustion burners are arranged symmetrically on the upper and lower surfaces of the strip passing through, and the temperature in the furnace is increased to a preset value range through direct combustion of the burners, and finally the strip is heated to the temperature required for annealing heat treatment. The heating process, i.e. the burner combustion heating process, is realized through automatic control and achieves control accuracy.

[0031] Furthermore, if Figure 1 and Figure 2As shown, the horizontal elevation of the furnace head of the furnace body 1 is 1000mm higher than the horizontal elevation of the furnace tail. The natural flow of flue gas in the continuous horizontal annealing furnace type structure with high furnace pressure, natural flow of flue gas and high-temperature combustion-supporting air is realized as follows: the annealing furnace furnace head is relatively about 1000mm higher than the horizontal elevation of the furnace tail. The preheating section and the heating section are fully connected, and the strip steel is supported by a fully sealed furnace support roller group, namely, the furnace front support roller 2, the preheating support roller 3 and the lifting support roller group 4; and the design of the disc roller supporting the strip steel is adopted, so as to realize the natural forward flow of combustion flue gas + exhaust gas exhaust drainage, thereby reducing the flow resistance and heat loss of flue gas under high furnace pressure, and also reducing the load of the exhaust fan. At the same time, compared with the traditional mode of using all disc rollers or all internal furnace support rollers, the volume of the flue gas circulation space in the preheating section and the heating section (the main heating area, where the amount of gas and flue gas is large) is increased, the flue gas circulation resistance is reduced, and it is beneficial for the natural flow of flue gas; and only two sets of disc rollers 5 are designed and used, which are mainly used to prevent the furnace roller pressing defects caused by the rapid drop of process speed in the production line with high production capacity (such as the annual production capacity of stainless steel is greater than 800,000 tons) in an emergency, and to facilitate the timely switching of the furnace support rollers, that is, the furnace front support roller 2, the preheating support roller 3 and the lifting support roller. Roller group 4 is also conducive to facilitating the treatment of nodules on the surface of the off-line support roller of the disc roller 5; while the traditional full disc roller mode design requires a large amount of roller (disc roller + support roller) cooling circulation water, and a long water flow process, requiring a large power circulation pump and lift, especially in the summer of recent years under the continuous high temperature (≥40℃) environment, the cooling effect is poor, which can easily lead to the online support roller due to excessively high cooling water temperature (≥50℃), resulting in the roller body bending and deformation and the roller pressing defect in the furnace, thereby having a great impact on production quality and equipment. Compared with the full-furnace support roller mode, the furnace support rollers in the high-temperature and high-pressure heating section are very susceptible to nodules on the roller surface and furnace roller indentation defects when the production process speed drops sharply. In particular, if nodules and furnace roller indentation defects occur on both furnace support rollers, a large amount of time is required to replace new rollers and low-load and low-output production is required, which will inevitably have a serious impact on production quality, capacity and equipment; and the high-temperature combustion-supporting air is: the preheating section and the heating section are connected as an integrated furnace, the flue gas circulation is relatively smooth, and there is no use of the disc roller 5 mode to absorb more or less cold air outside the furnace at the gap between the disc roller 5 and the furnace body 1, and the pressure in the furnace is relatively stable, which is more conducive to efficient heat exchange between the combustion air heat exchanger and the high-temperature flue gas, thereby increasing the temperature of the combustion-supporting air.

[0032] Furthermore, if Figure 2As shown, the tail of the furnace body 1 adopts a heat-resistant structure, which extends to the rear of the disc roller 5 and covers the top of the disc roller 5. The heat-resistant structure includes a stainless steel shell 10, an insulation board 11 and a special-shaped insulation module 12. The insulation board 11 is installed on the inner wall of the stainless steel shell 10, and the special-shaped insulation module 12 is installed on the insulation board 11. The stainless steel shell 10, the insulation board 11 and the special-shaped insulation module 12 are connected by anchoring nails 13. The outside adopts heat-resistant stainless steel as the shell, and the inside adopts 50mm thick insulation board + 350mm thick heat-resistant (maximum 1500℃) special-shaped (inverted L) insulation module to form an insulation layer, thereby effectively solving the production and equipment accidents caused by high-temperature burning and leakage or refractory falling off of the traditional furnace tail and tail door using water-cooled beams or high-temperature cast refractory materials under high temperature (about 1200℃) and high furnace pressure (+10~30Pa).

[0033] Furthermore, if Figures 3 to 7 As shown, a smoke dust removal mechanism is arranged in the smoke exhaust pipe 6, and one end of the smoke exhaust pipe 6 away from the furnace body 1 is connected to the discharge pipe, and a circulation pipe 14 is arranged between the discharge pipe and the smoke exhaust fan 7, one end of the circulation pipe 14 is connected to the smoke exhaust pipe 6, and the other end is connected to the preheating section from the bottom of the furnace body 1, and the smoke dust removal mechanism includes an upper dust removal ring 15 and a lower dust removal ring 16, and the top of the lower dust removal ring 16 is provided with a plurality of lower dust removal wires 17 along its length direction, and the bottom of the upper dust removal ring 15 is provided with a plurality of upper dust removal wires 18 along its length direction, and the upper dust removal ring 15 is connected to the lower dust removal ring 16 by screws, so as to make the lower dust removal wires 17 contact with the upper dust removal wires 18 to form a mesh dust removal net, in order to avoid the reuse of smoke causing the smoke to adhere to the strip and affect the annealing quality, the smoke repeatedly entering the furnace body 1 The flue gas is purified by the smoke removal mechanism and then circulated into the furnace body 1 to preheat the strip steel. At the same time, the smoke is purified before being discharged to avoid pollution to the environment. Specifically, the flue gas is filtered by a mesh dust removal net formed by a plurality of upper dust removal wires 17 and a plurality of upper dust removal wires 18, thereby removing smoke in the smoke, so that the smoke does not enter the circulation, thereby avoiding affecting the annealing of the strip steel. At the same time, the flue gas is discharged after treatment, and does not pollute the environment. The upper dust removal wire 18 and the lower dust removal wire 17 are a split structure. After removing the smoke removal mechanism, unscrew the screws, separate the upper dust removal ring 15 from the lower dust removal ring 16, and separate the upper dust removal wire 18 from the lower dust removal wire 17, so that the smoke removal mechanism can be quickly unblocked, which is convenient for the later maintenance of the smoke removal mechanism. During specific implementation, in order to prevent the smoke filtered by the smoke dust removal mechanism from returning to the furnace body 1, a dust guide plate is obliquely arranged below the smoke dust removal mechanism, and the bottom end of the dust guide plate is connected to the smoke exhaust pipe 6. A gap is formed between the high end of the dust guide plate and the smoke exhaust pipe 6 for the smoke to flow through. The side wall of the smoke exhaust pipe 6 is connected to a dust storage pipe at the bottom end of the dust guide plate. A valve is arranged on the dust storage pipe so that the screened smoke falls on the dust guide plate, and the smoke falls into the dust storage pipe through the dust guide plate, which is convenient for regular dust removal.

[0034] Furthermore, if Figure 1 and Figure 5 As shown, the upper dust removal ring 15 includes a left half ring 19 and a right half ring 20, both ends of the opening of the left half ring 19 are connected to the two ends of the opening of the right half ring 20 through a bellows 36, and both ends of the upper dust removal wire 18 are respectively connected to the left half ring 19 and the right half ring 20, and a telescopic mechanism is arranged between the left half ring 19 and the right half ring 20, and the telescopic mechanism includes a fixed column 21, a sliding column 22 and a lead screw 23, one end of the fixed column 21 is connected to the middle of the inner wall of the left half ring 19, and the other end is opened There is a rectangular groove 24, the lead screw 23 is arranged in the rectangular groove 24 and rotatably connected to the left half ring 19, one end of the sliding column 22 is slidably adapted in the rectangular groove 24, and the other end is connected to the middle part of the inner wall of the right half ring 20, the sliding column 22 is threadedly sleeved on the lead screw 23, and the outer wall of the left half ring 19 is provided with an operating groove 25, one end of the lead screw 23 extends into the operating groove 25 and is provided with an inner hexagonal groove, and the upper dust removal wire 18 is in a straight or relaxed state through the telescopic mechanism. The unclogged part 15 is then unclogged by the action of the screw 23 which is then engaged with the guide 23. The unclogged part 15 is then unclogged by the action of the screw 23 which is then engaged with the guide 23. The unclogged part 15 is then unclogged by the action of the screw 23 which is then engaged with the guide 23.

[0035] Furthermore, if Figures 3 to 7As shown, the lower dust removal ring 16 is installed in the smoke exhaust pipe 6 through a detachable connecting component, and the detachable connecting component includes a movable steel ball 26 and a rotating lock ring 27. The outer wall of the lower dust removal ring 16 is evenly distributed along its own circumferential direction. A plurality of frustum holes 28 are opened, and the large diameter end of the frustum hole 28 is arranged close to the smoke exhaust pipe 6. The side wall of the smoke exhaust pipe 6 is provided with a movable hole at a position corresponding to the frustum hole 28. The movable hole includes a large diameter hole 30 and a small diameter hole 31 that are coaxially connected. The movable steel ball 26 is movably adapted in the large diameter hole 30. The rotating lock ring 27 is rotatably mounted on the smoke exhaust pipe 6. Each movable hole is correspondingly provided with an arc groove 29. The arc groove 29 is coaxially opened on the inner wall of the rotating lock ring 27. Both end surfaces of the groove 29 are set as inclined surfaces. When the moving steel ball 26 partially passes through the small diameter hole 31 and fits in the truncated cone hole 28, the moving steel ball 26 contacts the inner side wall of the rotating lock ring 27. When the moving steel ball 26 contacts the inner side wall of the arc groove 29, the moving steel ball 26 is separated from the truncated cone hole 28. The smoke exhaust pipe 6 is a split mechanism. The two sections of the smoke exhaust pipe 6 are connected by flanges, and the smoke dust removal mechanism is arranged in the lower section of the smoke exhaust pipe 6, so that the smoke exhaust pipe 6 can be disassembled and the internal smoke dust removal mechanism can be removed. At the same time, a positioning ring 38 is fixed to the inner wall of the smoke exhaust pipe 6, and a plurality of positioning grooves are provided on the top surface of the positioning ring 38. A plurality of positioning posts are fixed to the bottom of the lower dust removal ring 16. The plurality of positioning posts and the plurality of The positioning grooves are matched one by one, so as to accurately locate the installation position of the smoke dust removal mechanism. When the positioning column is matched in the positioning groove, the movable hole corresponds to the truncated cone hole 28. At this time, the rotating lock ring 27 is rotated. Under the inclined surface guidance of the arc groove 29, the rotating lock ring 27 can squeeze the moving steel ball 26 to move, so that the moving steel ball 26 can be separated from the arc groove 29 and contact the inner side wall of the rotating lock ring 27, so that part of the moving steel ball 26 passes through the small diameter hole 31 and fits in the truncated cone hole 28. At this time, the moving steel ball 26 is restricted between the rotating lock ring 27 and the lower dust removal ring 16, so that the lower dust removal ring 16 is stably installed on the smoke exhaust pipe 6, ensuring that the smoke dust removal mechanism is in the flow effect of the smoke. There will be no deviation at the bottom; when the smoke and dust removal mechanism needs to be removed, the rotating locking ring 27 is rotated to make the arc groove 29 correspond to the movable hole, and then the smoke and dust removal mechanism is taken out. Since the inner wall of the truncated cone hole 28 is an inclined surface, the movable steel ball 26 cannot be locked. In the process of moving the lower dust removal ring 16, the movable steel ball 26 will be pushed to move, so that the movable steel ball 26 will be separated from the truncated cone hole 28. At this time, the movable steel ball 26 is partially located in the arc groove 29, so that the lower dust removal ring 16 is unlocked. The operation is simple and the self-locking type is better; the movable hole is a stepped hole, which can limit the movable steel ball 26, that is, the movable steel ball 26 cannot pass through the small diameter hole 31, so as to prevent the movable steel ball 26 from falling into the smoke exhaust pipe 6.

[0036] Furthermore, the rotating lock ring 27 is connected by two half lock rings through bolts, and two graphene sealing rings 39 are fixedly sleeved on the smoke exhaust pipe 6, and the movable hole is located between the two graphene sealing rings 39. Two annular sealing grooves 37 are opened on the inner wall of the rotating lock ring 27, and the axial width of the annular sealing groove 37 gradually decreases along the direction away from the center of the circle of the rotating lock ring 27. The graphene sealing ring 39 is interference fit in the annular sealing groove 31, and the upper and lower parts of the rotating lock ring 27 are sealed by the two graphene sealing rings 39 to prevent smoke from overflowing. At the same time, the graphene sealing ring 39 has high temperature resistance and can operate for a long time in a high temperature environment to ensure good sealing performance. At the same time, the graphene sealing ring The interference fit between the rotating lock ring 39 and the rotating lock ring 27 can make the rotating lock ring 27 and the graphene sealing ring 39 have a strong friction force, so that the rotating lock ring 27 will not automatically deflect under normal conditions, thereby being able to stably lock the smoke removal mechanism. Secondly, the rotating lock ring 27 adopts a split structure, which is convenient for installing the rotating lock ring 27 on the smoke exhaust pipe 6, and makes the graphene sealing ring 39 interference fit in the annular sealing groove 37. The axial width of the annular sealing groove 37 is gradual, and the width gradually decreases away from the smoke exhaust pipe 6, so that the graphene sealing ring 39 can be easily inserted into the annular sealing groove 37. As the bolts between the two half lock rings are tightened, the graphene sealing ring 39 gradually interference fits in the annular sealing groove. 37, which is convenient for the sealing installation of the rotating lock ring 27; because the rotating lock ring 27 is interference-fitted with the graphene sealing ring 39, the rotating lock ring 27 is not easy to rotate. Therefore, an electric drive method is adopted. Specifically, a sprocket 32 ​​is mounted on the rotating lock ring 27, and a motor is arranged away from the furnace body 1. The output shaft of the motor is connected with a driving sprocket, and the driving sprocket is connected to the sprocket 32 ​​through a chain transmission. A positioning rod 33 is fixed to the bottom of the rotating lock ring 27, and a first mechanical limit block 34 and a second mechanical limit block 35 are fixed to the top of the furnace body 1. The positioning rod 33 is located between the first mechanical limit block 34 and the second mechanical limit block 35. When the positioning rod 33 contacts the first mechanical limit block 34, the moving steel ball 26 is partially adapted to the circular In the table hole 28, when the positioning rod 33 contacts the second mechanical limit block 34, the moving steel ball 26 disengages from the truncated table hole 28, and the active sprocket is driven to rotate by the motor, and the active sprocket drives the sprocket 32 ​​to rotate through the chain, and the sprocket 32 ​​drives the rotating lock ring 27 to rotate. When installing the smoke and dust removal mechanism, the positioning rod 33 is deflected to contact with the first mechanical limit block 34. At this time, the inner side wall of the rotating lock ring 27 contacts the moving steel ball 26, so that the moving steel ball 26 is partially adapted in the truncated table hole 28 to complete the installation; when removing the smoke and dust removal mechanism, the positioning rod 33 is deflected to contact with the second mechanical limit block 35. At this time, the arc groove 29 corresponds to the movable hole. At this time, the smoke and dust removal mechanism can be directly taken out, making the disassembly and assembly more precise and stable.

[0037] A highly efficient and energy-saving production control method for a strip steel continuous annealing furnace, during normal and stable production: the furnace tail pressure gauge of the furnace body 1 is controlled to set a target value of +40Pa; the oxygen content in the furnace body 1 is controlled to set a target value of: preheating stage: 2.5%, heating stage 1, heating stage 2, heating stage 3: 2%; heating stage 4: 1.5%;

[0038] When the temperature drops rapidly due to abnormal production conditions: the pressure gauge at the tail of furnace body 1 controls the target value: 0Pa;

[0039] When the production speed increases abnormally: the target value of the furnace pressure gauge at the end of furnace body 1 is set to +40Pa; the target value of the oxygen content in furnace body 1 is set to: preheating stage: 3%, heating stage 1, heating stage 2, heating stage 3: 2%; heating stage 4: 2.5%;

[0040] When the temperature rises abnormally quickly during production: the target value of the furnace pressure gauge at the end of furnace body 1 is set to +30Pa; the target value of the oxygen content in furnace body 1 is set to: preheating stage: 3-5%, heating stage 1, heating stage 2, heating stage 3: 2-4%; heating stage 4: 2-3%;

[0041] When the furnace roller pressure defect occurs during the abnormal rapid deceleration of production, or the cooling circulating water temperature of the furnace roller is too high, the control measures are as follows: first adjust the furnace pressure to the target value: -5~-15Pa, reduce the process speed to ≤35m / min, and switch the disc roller 5 online: rotate the disc roller 5 in the running direction, and turn the strip steel support roller on the offline disc roller 5 to the online position, and the corresponding original online support roller is turned to the offline position; at the same time, increase the net circulating cooling water flow on the other side of the cooling circulating water cooling heat exchange, increase its heat exchange capacity, and make the inlet water temperature <20℃, and the reflux temperature ≤35℃, and then confirm whether the above undesirable conditions have been eliminated. If they have been eliminated, gradually resume production; if the above undesirable conditions have not been eliminated, proceed to the next step:

[0042] Adjust the furnace pressure to the target value: -10 ~ -25Pa, reduce the process speed to ≤30m / min, and then switch the lifting support rollers in the furnace one by one from the back to the front, and confirm the effects after switching one by one until the above adverse conditions are eliminated. For this purpose, the switched support rollers are then inspected offline or taken out and replaced with new spare rollers.

Claims

1. A high-efficiency and energy-saving strip steel continuous annealing furnace structure, characterized in that: The invention comprises a furnace body (1), wherein a preheating section, a first heating section, a second heating section, a third heating section and a fourth heating section are sequentially arranged in the furnace body (1) from the furnace head to the furnace tail, wherein the preheating section and the first heating section are fully connected, a furnace front support roller (2) is arranged at the furnace head of the furnace body (1), a preheating support roller (3) is arranged in the preheating section, a lifting support roller group (4) is arranged in the first heating section, the second heating section and the third heating section, a disc roller (5) is arranged in the fourth heating section and at the furnace tail of the furnace body (1), a smoke exhaust fan (7) is arranged at the top of the furnace body (1), one end of the smoke exhaust fan (7) is connected to the preheating section, and the other end is connected to a smoke exhaust pipe (6) for allowing the exhaust gas in the furnace body (1) to enter the preheating section, and a plurality of furnace pressure gauges (8) are arranged on the furnace body (1), and each of the preheating section, the first heating section, the second heating section, the third heating section and the fourth heating section corresponds to at least one furnace pressure gauge (8).

2. The high-efficiency and energy-saving strip steel continuous annealing furnace structure according to claim 1 is characterized in that: The furnace body (1) is provided with a plurality of oxygen analyzers (9), each of the preheating section, the first heating section, the second heating section, the third heating section and the fourth heating section corresponds to at least one oxygen analyzer (9), and the furnace head of the furnace body (1) has a sloping furnace top structure with a height of 1000 mm relative to the horizontal elevation of the furnace tail.

3. The high-efficiency and energy-saving strip steel continuous annealing furnace structure according to claim 1 is characterized in that: The furnace tail of the furnace body (1) adopts a heat-resistant structure, which extends to the rear of the disc roller (5) and covers the top of the disc roller (5). The heat-resistant structure includes a stainless steel shell (10), an insulation board (11) and a special-shaped insulation module (12). The insulation board (11) is installed on the inner wall of the stainless steel shell (10), and the special-shaped insulation module (12) is installed on the insulation board (11). The stainless steel shell (10), the insulation board (11) and the special-shaped insulation module (12) are connected by anchoring nails (13).

4. The high-efficiency and energy-saving strip steel continuous annealing furnace structure according to claim 1 is characterized in that: A smoke dust removal mechanism is arranged in the smoke exhaust pipe (6), one end of the smoke exhaust pipe (6) away from the furnace body (1) is connected to a discharge pipe, a circulation pipe (14) is arranged between the discharge pipe and the smoke exhaust fan (7), one end of the circulation pipe (14) is connected to the smoke exhaust pipe (6), and the other end is connected to the preheating section from the bottom of the furnace body (1), the smoke dust removal mechanism comprises an upper dust removal ring (15) and a lower dust removal ring (16), the top of the lower dust removal ring (16) is provided with a plurality of lower dust removal wires (17) along its length direction, the bottom of the upper dust removal ring (15) is provided with a plurality of upper dust removal wires (18) along its length direction, the upper dust removal ring (15) and the lower dust removal ring (16) are connected by screws, so as to make the lower dust removal wires (17) contact with the upper dust removal wires (18) to form a mesh dust removal net.

5. The high-efficiency and energy-saving strip steel continuous annealing furnace structure according to claim 4 is characterized in that: The upper dust removal ring (15) comprises a left half ring (19) and a right half ring (20), the two ends of the opening of the left half ring (19) are connected to the two ends of the opening of the right half ring (20) through a bellows (36), the two ends of the upper dust removal wire (18) are respectively connected to the left half ring (19) and the right half ring (20), a telescopic mechanism is arranged between the left half ring (19) and the right half ring (20), the telescopic mechanism comprises a fixed column (21), a sliding column (22) and a lead screw (23), one end of the fixed column (21) is connected to the left half ring (19) ) is located in the middle of the inner wall of the left half ring (19), and a rectangular groove (24) is provided at the other end. The lead screw (23) is arranged in the rectangular groove (24) and is rotatably connected to the left half ring (19). One end of the sliding column (22) is slidably adapted in the rectangular groove (24), and the other end is connected to the middle of the inner wall of the right half ring (20). The sliding column (22) is threadedly mounted on the lead screw (23). An operating groove (25) is provided on the outer wall of the left half ring (19), and one end of the lead screw (23) extends into the operating groove (25) and is provided with an inner hexagonal groove.

6. The high-efficiency and energy-saving strip steel continuous annealing furnace structure according to claim 4 is characterized in that: The lower dust removal ring (16) is installed in the smoke exhaust pipe (6) through a detachable connecting component, and the detachable connecting component includes a movable steel ball (26) and a rotating lock ring (27). The outer wall of the lower dust removal ring (16) is evenly distributed along its own circumferential direction. A plurality of truncated cone holes (28) are opened, and the large diameter end of the truncated cone hole (28) is arranged close to the smoke exhaust pipe (6). The side wall of the smoke exhaust pipe (6) is opened at a position corresponding to the truncated cone hole (28). The movable hole includes a large diameter hole (30) and a small diameter hole (31) that are coaxially connected. The movable steel ball (26) is movably adapted in the large diameter hole (30). The rotating lock ring (27) is rotatably mounted on the smoke exhaust pipe (6), and each of the movable holes is correspondingly provided with an arc groove (29), and the arc groove (29) is coaxially opened on the inner wall of the rotating lock ring (27), and both end surfaces of the arc groove (29) are arranged as inclined surfaces. When the moving steel ball (26) partially passes through the small diameter hole (31) and fits into the truncated cone hole (28), the moving steel ball (26) contacts the inner side wall of the rotating lock ring (27), and when the moving steel ball (26) contacts the inner side wall of the arc groove (29), the moving steel ball (26) is separated from the truncated cone hole (28).

7. The high-efficiency and energy-saving strip steel continuous annealing furnace structure according to claim 6, characterized in that: The rotating lock ring (27) is composed of two half lock rings connected by bolts. The smoke exhaust pipe (6) is fixedly sleeved with two graphene sealing rings (39). The movable hole is located between the two graphene sealing rings (39). The inner wall of the rotating lock ring (27) is provided with two annular sealing grooves (37). The axial width of the annular sealing grooves (37) gradually decreases in a direction away from the center of the rotating lock ring (27). The graphene sealing ring (39) is interference-fitted in the annular sealing groove (31).

8. The high-efficiency and energy-saving strip steel continuous annealing furnace structure according to claim 7, characterized in that: A sprocket (32) is sleeved on the rotating lock ring (27), and a motor is arranged away from the furnace body (1). The output shaft of the motor is connected to a driving sprocket, and the driving sprocket is connected to the sprocket (32) through a chain transmission.

9. The high-efficiency and energy-saving strip steel continuous annealing furnace structure according to claim 8, characterized in that: A positioning rod (33) is fixed at the bottom of the rotating lock ring (27), and a first mechanical limit block (34) and a second mechanical limit block (35) are fixed at the top of the furnace body (1). The positioning rod (33) is located between the first mechanical limit block (34) and the second mechanical limit block (35). When the positioning rod (33) contacts the first mechanical limit block (34), the movable steel ball (26) is partially adapted in the truncated cone hole (28). When the positioning rod (33) contacts the second mechanical limit block (34), the movable steel ball (26) is separated from the truncated cone hole (28).

10. A highly efficient and energy-saving strip steel continuous annealing furnace production control method, characterized in that: During normal and stable production: the furnace pressure gauge at the furnace tail of the furnace body (1) is controlled to set the target value: +40Pa; the oxygen content in the furnace body (1) is controlled to set the target value: preheating stage: 2.5%, heating stage 1, heating stage 2, heating stage 3: 2%; heating stage 4: 1.5%; When the temperature drops rapidly due to abnormal production conditions: the pressure gauge at the tail of the furnace body (1) is set to the target value: 0Pa; When the production speed increases abnormally: the furnace pressure gauge at the furnace tail of the furnace body (1) is controlled to set the target value: +40Pa; the oxygen content in the furnace of the furnace body (1) is controlled to set the target value: preheating stage: 3%, heating stage 1, heating stage 2, heating stage 3: 2%; heating stage 4: 2.5%; When the temperature rises abnormally quickly during production: the furnace pressure gauge at the furnace tail of the furnace body (1) is controlled to set the target value: +30Pa; the oxygen content in the furnace of the furnace body (1) is controlled to set the target value: preheating stage: 3-5%, heating stage 1, heating stage 2, heating stage 3: 2-4%; heating stage 4: 2-3%; When the furnace roller pressure defect occurs during the abnormal rapid speed reduction of production, or the furnace roller cooling circulation water temperature is too high, the control measures are as follows: first, the furnace pressure is adjusted to the target value: -5~-15Pa, the process speed is reduced to ≤35m / min, and the disc roller (5) is switched online: the disc roller (5) is rotated along the running direction, and the strip steel support roller on the offline disc roller (5) is turned to the online position, and the corresponding original online support roller is turned to the offline position; at the same time, the net circulating cooling water flow on the other side of the cooling circulation water cooling heat exchange is increased to increase its heat exchange capacity, and the inlet water temperature is <20℃, and the reflux temperature is ≤35℃, and then confirm whether the above undesirable conditions have been eliminated. If they have been eliminated, gradually resume production; if the above undesirable conditions have not been eliminated, proceed to the next step: Adjust the furnace pressure to the target value: -10 ~ -25Pa, reduce the process speed to ≤30m / min, and then switch the lifting support rollers in the furnace one by one from the back to the front, and confirm the effects after switching one by one until the above adverse conditions are eliminated. For this purpose, the switched support rollers are then inspected offline or taken out and replaced with new spare rollers.

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