Environment-friendly continuous annealing system for strip steel

Abstract

This invention relates to an environmentally friendly continuous strip steel annealing system, comprising an annealing furnace, a low-NOx radiant tube burner arranged inside the furnace, an electromagnetic induction preheating device arranged on the inlet side of the furnace, and a catalytic denitrification device arranged on the flue gas pipeline of the furnace. The continuous strip steel annealing system provided by this invention employs a combination of electromagnetic induction preheating, a low-NOx radiant tube combustion annealing furnace, and catalytic denitrification, which can significantly reduce the NOx content in the annealing furnace flue gas, ensuring the system's environmental friendliness. Specifically, the electromagnetic induction preheating device rapidly preheats the strip steel, which on the one hand reduces the workload of the low-NOx radiant tube burner in the annealing furnace, thereby reducing NOx generation and emissions and improving the environmental friendliness of the continuous strip steel annealing system; on the other hand, it can refine the strip steel grains, achieving simultaneous improvement in iron loss and magnetic induction, and enhancing the effect of subsequent annealing heat treatment, further improving the quality of the strip steel product.

Description

Technical Field

[0001] This invention belongs to the field of strip steel heat treatment technology, specifically relating to an environmentally friendly continuous strip steel annealing system. Background Technology

[0002] Heat treatment of strip steel is one of the important means to improve quality, especially for the production of high value-added strip steel. During the operation of the annealing furnace, a certain amount of flue gas is generated due to the combustion of the burner. At present, although the NOx content in the flue gas of the annealing furnace can be controlled at a low level by means of adopting low-NOx radiant tube burners, the NOx content in the flue gas of most annealing furnaces still cannot meet the emission requirements due to increasingly stringent environmental protection requirements. Summary of the Invention

[0003] This invention relates to an environmentally friendly continuous annealing system for strip steel, which can at least solve some of the defects of the prior art.

[0004] This invention relates to an environmentally friendly continuous strip steel annealing system, including an annealing furnace, a low-NOx radiant tube burner arranged inside the annealing furnace, an electromagnetic induction preheating device arranged on the inlet side of the annealing furnace, and a catalytic denitrification device arranged on the flue gas pipeline of the annealing furnace.

[0005] As one embodiment, the electromagnetic induction preheating device includes an induction heater, which employs a closed-loop induction coil and forms a strip running channel within the coil. The induction heater is equipped with a translation drive mechanism, thus having a working position and an offline position.

[0006] As one implementation method, an emergency shear is arranged on the working position inlet side or the working position outlet side of the induction heater.

[0007] As one implementation, roller frames are arranged on the inlet side and outlet side of the workstation, respectively. The roller frames are equipped with idler rollers for supporting strip steel and pressure rollers located directly above the idler rollers. The pressure rollers are equipped with pressure roller lifting drive units, and the emergency shear is integrated and installed on the roller frames on the corresponding sides.

[0008] As one implementation method, the environmentally friendly continuous strip annealing system also includes a belt conveyor. The belt conveyor's belt travel path includes a material-bearing section. In the material-bearing section, the belt passes through the induction heating chamber of the induction heater and is located directly below the strip running channel, so as to automatically clean the iron oxide scale that falls off the strip surface out of the induction chamber.

[0009] As one embodiment, the catalytic denitrification device includes a deaerator, a catalytic denitrification device, and a decarbonization device connected in series through a flue gas pipeline. The deaerator is equipped with a gas supply pipe, and the catalytic denitrification device is an SCR denitrification device.

[0010] As one embodiment, the decarbonizer is equipped with a decarbonization catalyst and an oxygen supply pipe.

[0011] As one implementation method, a heat exchanger is also arranged on the flue gas duct on the outlet side of the decarbonizer, and the medium supply pipe of the low-NOx radiant tube burner is connected to the heat exchanger.

[0012] The present invention has at least the following beneficial effects:

[0013] The continuous strip annealing system provided by this invention adopts a combination of electromagnetic induction preheating, a low-NOx radiant tube combustion annealing furnace, and catalytic denitrification, which can significantly reduce the NOx content in the annealing furnace flue gas and ensure the environmental friendliness of the system. In particular, the electromagnetic induction preheating device rapidly preheats the strip steel, which on the one hand reduces the workload of the low-NOx radiant tube burner in the annealing furnace, thereby reducing NOx generation and emissions and improving the environmental friendliness of the continuous strip annealing system. On the other hand, it can refine the strip steel grains, achieve simultaneous improvement in iron loss and magnetic induction, and improve the effect of subsequent annealing heat treatment, further improving the quality of the strip steel product. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the composition of the continuous strip annealing system provided in an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the electromagnetic induction preheating device provided in an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the translational arrangement structure of the induction heater provided in an embodiment of the present invention. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figure 1This invention provides an environmentally friendly continuous strip steel annealing system, including an annealing furnace 1, a low-NOx radiant tube burner arranged inside the annealing furnace 1, an electromagnetic induction preheating device 2 arranged on the inlet side of the annealing furnace 1, and a catalytic denitrification device 3 arranged on the flue gas pipeline of the annealing furnace 1.

[0020] The aforementioned low-NOx radiant tube burner can employ existing radiant tube burners in the field, utilizing staged combustion, flue gas entrainment, and dual-pass heat exchange to achieve optimal control of the burner's own NOx levels and improve overall combustion efficiency. Preferably, with the flue gas entrainment rate controlled within the range of 20-50% and the target furnace temperature within 950℃, NOx emissions can be controlled to 150 mg / m³. 3 The following describes a dual-pass heat exchange system, which includes primary heat exchange inside the radiant tube and secondary heat exchange outside the radiant tube. Within a target furnace temperature range of 950°C, the air preheating temperature is high (up to 650°C), and the overall thermal efficiency of the radiant tube can reach 65%–70%. In one embodiment, the low-NOx radiant tube burner can be one or more of type I, U, W, P, or double P types.

[0021] During the operation of annealing furnace 1, the overall nitrogen oxide emission control and overall efficiency of the furnace section can be minimized through the radiant tube heating section model decision system and the combustion optimization control system. Specifically, the model decision system, based on the thermal model, calls upon functional modules such as strip temperature tracking, annealing curve optimization, furnace temperature setpoint calculation, and self-learning correction to provide the combustion optimization control model with process setpoints under steady-state production and dynamic conditions. The combustion optimization control system targets the process setpoints calculated by the model decision system to achieve intelligent optimization control of combustion automation, furnace temperature, air-fuel ratio, furnace pressure, flue gas temperature, and low pollutant emissions. Specifically, it includes a furnace temperature control unit model and a flue gas temperature and furnace pressure control unit model. The furnace temperature control unit model automatically calculates the air and gas flow setpoints based on the furnace temperature deviation, residual oxygen detection value, and online calorimeter detection value, forming the gas and air valve adjustment setpoints. The flue gas temperature and furnace pressure control unit model performs comprehensive evaluation and diagnosis based on the pressure, flue gas temperature, and residual oxygen online detection values ​​to form the exhaust fan and exhaust valve opening setpoints.

[0022] The aforementioned catalytic denitrification device 3 is used to denitrify the flue gas generated by the annealing furnace 1, ensuring the cleanliness of the flue gas emitted by the annealing furnace 1. This catalytic denitrification device 3 can employ the conventional NH3-SCR process, but this method requires a large area, a long process, and necessitates the installation of ammonia storage tanks, ammonia evaporation, and ammonia slip detection facilities. Simultaneously, the catalyst needs to be regenerated or replaced. Alternatively, an integrated desulfurization and denitrification method using activated coke or activated carbon can be employed, enabling the utilization of sulfur resources. However, its denitrification still requires ammonia injection or catalytic oxidation, and the resulting waste liquid and adsorbent both require treatment, similarly involving a long chemical process. Considering that the flue gas volume of the annealing furnace 1 is relatively small and the concentrations of SO2 and NO are relatively low, the conventional NH3-SCR and activated carbon fiber adsorption methods are prone to problems such as large size and small capacity, safety hazards, and excessive footprint. In this embodiment, the coal gas existing in the steel enterprise is used to achieve the catalytic reduction of NO based on the various reducing agents (CO, H2S, CH4, H2) contained in the coal gas. This can take advantage of its own strengths and avoid its weaknesses to achieve good technical and economic benefits in pollutant emission reduction. Specifically, depending on the environmental protection requirements, the nitrogen oxide emission level can be reduced by 60% to 90%.

[0023] In one embodiment, such as Figure 1 The catalytic denitrification device 3 includes a deaerator 31, a catalytic denitrification device 32, and a decarbonizer 33 connected in series via a flue gas pipeline. The deaerator 31 is equipped with a gas supply pipe, and the catalytic denitrification device 32 is an SCR denitrification device. In the deaerator 31, gas is introduced to mix with the flue gas. This allows the gas to pre-react with any oxygen present in the flue gas, ensuring the efficiency and safety of the subsequent denitrification reaction. Simultaneously, mixing the gas with the flue gas regulates the inlet flue gas temperature of the catalytic denitrification device 32, ensuring that the inlet flue gas temperature matches the optimal reaction temperature of the denitrification catalyst, thus extending the catalyst's lifespan. Furthermore, pre-mixing the gas with the flue gas before introducing it into the catalytic denitrification device 32 improves the reaction efficiency and completeness of the catalytic denitrification process. The aforementioned catalytic denitrification unit 32 uses hydrocarbons as a reducing agent to form HC / H2 / CO-SCR denitrification. It utilizes residual CO in the flue gas duct and externally supplied coal gas resources (CO+H2) to complete the denitrification reaction (CO+NO—N2+CO2) in the presence of a denitrification catalyst. The denitrification catalyst can be rare earth, Cu, Rh, Pd, or Pt type catalysts. The aforementioned decarbonizer 33 is mainly used to remove residual coal gas components within the catalytic denitrification unit 32, ensuring that the flue gas meets emission standards. In one embodiment, the decarbonizer 33 employs a catalytic decarbonization method, i.e., the decarbonizer 33 contains a decarbonization catalyst and is equipped with an oxygen supply pipe. The decarbonization catalyst can be a precious metal (Pt, Pd), rare earth (Ce), transition metal (Cu, Mn, Fe), or perovskite catalyst. The reaction in the decarbonizer 33 involves CO+O2=CO2; CHy +O2=CO2+H2O, H2+O2=H2O.

[0024] More preferably, such as Figure 1 A heat exchanger 4 is also arranged on the flue gas duct on the outlet side of the decarbonizer 33 to exchange heat with the flue gas at the outlet of the decarbonizer 33, making full use of the waste heat of this part of the flue gas. The flue gas after heat exchange can be discharged through the chimney. Preferably, the waste heat of this part of the flue gas can be used to preheat the medium used in the low-NOx radiant tube burner, such as combustion air or coal gas. That is, the medium supply pipe of the low-NOx radiant tube burner is connected to the heat exchanger 4.

[0025] The aforementioned electromagnetic induction preheating device 2 is used to rapidly preheat the strip steel. On the one hand, it can reduce the workload of the low-NOx radiant tube burner in the annealing furnace 1, thereby reducing NOx generation and emissions and improving the environmental friendliness of the continuous strip steel annealing system. On the other hand, it can refine the strip steel grains, achieve simultaneous improvement in iron loss and magnetic induction, and improve the effect of subsequent annealing heat treatment, further improving the quality of the strip steel products.

[0026] In one embodiment, the electromagnetic induction preheating device 2 includes an induction heater 21. The induction heater 21 employs a closed-loop induction coil, forming a strip running channel within the coil. The induction heater 21 is equipped with a translation drive mechanism, thus having a working position and an offline position. Unlike conventional open-loop coil induction heating methods, this embodiment uses a closed-loop induction coil for rapid reheating of the strip, significantly improving heating efficiency and uniformity. Furthermore, the use of copper shielding on the inlet and outlet sides and aluminum shielding around the inductor creates a closed magnetic field, ensuring high operational safety.

[0027] Based on the above-mentioned movable design of the induction heater 21, the working flexibility and applicability of the electromagnetic induction preheating device 2 can be effectively improved. For example, for high-value-added products such as those with high annealing temperatures, the induction heater 21 can be moved to the online state for rapid reheating production through the above-mentioned translation drive mechanism. For conventional steel products that do not require rapid reheating, the induction heater 21 can be moved to the offline state, reducing production costs and avoiding the collision risk to the induction heater 21 caused by factors such as ultra-high speed operation and plate shape of conventional steel products.

[0028] Generally, the aforementioned induction heater 21 is equipped with a channel cabinet 27, which forms a resonant system with the induction heater 21. As a preferred embodiment, the channel cabinet 27 is arranged in parallel on top of the induction heater 21, which simplifies the equipment layout of the electromagnetic induction preheating device 2. On the one hand, it reduces the area occupied by the device. On the other hand, when the induction heater 21 is designed to be movable, the above-mentioned parallel cabinet design allows the channel cabinet 27 and the induction heater 21 to move together, ensuring the reliability of the connection between the two, thereby ensuring the stability and reliability of the induction heating operation.

[0029] Generally, the induction heater 21 is equipped with a power supply unit. Optionally, this power supply unit includes an input rectifier cabinet and an inverter cabinet. The three-phase current is rectified by the rectifier and filtered by the filter to become smooth DC power, which is then sent to the inverter. The inverter converts the DC power into higher-frequency AC power to supply the resonant system. Preferably, the input rectifier cabinet and the inverter cabinet are designed in parallel and arranged on the drive side of the unit. For the connection between the induction heater 21 and the power supply unit, the connecting cable can be routed in the cable chain 28.

[0030] In optional embodiments, such as Figure 3 The aforementioned translation drive mechanism includes a translation track 29, on which the aforementioned induction heater 21 is slidably disposed. The translation of the induction heater 21 can be achieved by means of motor drive or cylinder push-pull drive. Furthermore, online position detection devices and offline position detection devices (such as photoelectric switches) can be arranged next to the translation track 29 to ensure the accuracy of the state of the induction heater 21.

[0031] Based on the aforementioned closed-loop induction coil structure, the induction heater 21 cannot be directly removed from the production line when the strip is online. In accident situations (e.g., induction heater 21 malfunctions) or when the strip does not require reheating (in which case the induction heater 21 occupies system space, making it impossible to utilize this area effectively for auxiliary production tasks such as strip cutting and material handling), this is detrimental to the normal operation of the system. In this embodiment, as... Figure 2 Preferably, an emergency shear 25 is arranged on the inlet or outlet side of the working position of the induction heater 21. By cooperating with the movable structure of the induction heater 21, the electromagnetic induction preheating device 2 using a closed-loop induction coil can achieve the real-time online / offline effect of the open-type electromagnetic induction preheating device 2. Specifically, when the induction heater 21 is in the working position, upon receiving an offline command for the induction heater 21, the emergency shear 25 is activated to cut the strip steel and ensure that there is no strip steel inside the induction heater 21, thus moving the induction heater 21 to the offline position. When the induction heater 21 is in the offline position, upon receiving an online command for the induction heater 21, the emergency shear 25 is activated to cut the strip steel and ensure that there is no strip steel in the working position area, thus moving the induction heater 21 to the online position.

[0032] In one embodiment, such as Figure 2 Roller frames 23 are arranged on the inlet and outlet sides of the workstation, respectively. The roller frames 23 are equipped with idlers (illustrated but not labeled) for supporting the strip steel. These two sets of idlers support the strip steel, limiting its running height, for example, ensuring the strip steel is at the center height of the induction heating chamber, preventing contact or collision between the strip steel and the bottom or top of the chamber. The emergency shear 25 is preferably integrated with the corresponding roller frame 23, resulting in a compact production line layout and reduced equipment quantity and space occupation. In one embodiment, the roller frame 23 is mounted on the frame of the emergency shear 25, or an integral frame is used, on which the emergency shear 25 assembly and the idlers are arranged.

[0033] The aforementioned emergency shear 25 is preferably arranged on the exit side of the working position. After shearing the strip, the strip is withdrawn from the induction heater 21 by rewinding, which makes the operation more reliable.

[0034] Furthermore, a pressure roller (shown in the figure, not labeled) is also arranged on the roller frame 23. The pressure roller is located above the idler roller on the corresponding side and is equipped with a lifting drive unit. The lifting drive unit can be a linear drive device such as a cylinder or hydraulic cylinder. By configuring the pressure roller, the idler roller and the pressure roller cooperate to improve the running stability of the strip and constrain the shape of the strip, avoiding the strip from impacting the cavity of the induction heater 21. During the process of threading the strip head and tail, reasonable conveying can be achieved, avoiding situations such as the strip head or tail sticking up or overlapping, which would cause the strip to get stuck. At the same time, considering special working conditions such as strip breakage and reversal, when encountering a breakage, reversal, or emergency stop signal, the pressure roller can press down to alleviate the impact of the strip on the induction heater 21.

[0035] More preferably, an auxiliary guide plate can be provided on one of the roller frames 23. The auxiliary guide plate is hinged to the side of the roller frame 23 near the other roller frame 23 and is connected to a guide plate drive unit (e.g., a cylinder or hydraulic cylinder) that drives it to swing up and down. When the induction heater 21 is in the working position, the auxiliary guide plate swings down; when the induction heater 21 is in the offline position, the auxiliary guide plate can be swinged up to assist in completing the strip threading and the running of the strip tail.

[0036] Optionally, such as Figure 2 A pinch roller 24 can also be arranged on the inlet side of the working position of the induction heater 21 to facilitate the threading of the strip and the stable operation of the strip during normal production. The roller frame 23 on the inlet side of the working position can be integrated and installed on the pinch roller 24.

[0037] Optionally, such as Figure 2A purging device 26 is also arranged on the aforementioned accident shear 25 frame to achieve protective purging. Whenever a signal such as tape reversal, tape breakage, or unit shutdown is encountered, the purging device 26 will automatically start to purge until the unit runs normally, so as to avoid liquid backflow on the production line from affecting the normal operation of the induction heater 21.

[0038] In optional embodiments, such as Figure 2 The aforementioned electromagnetic induction preheating device 2 also includes a belt conveyor. The belt 221 of the belt conveyor has a material-bearing section along its movement path. In this section, the belt 221 passes through the induction heating chamber and is located directly below the strip running channel. By configuring the belt conveyor so that the belt 221 passes through the induction heating chamber and is located directly below the strip running channel, the iron oxide scale that naturally falls off the surface of the strip can be quickly carried out of the induction heating chamber. This prevents the iron oxide scale from remaining in the magnetic field and continuously heating up, which could damage the insulating materials of the chamber or even the induction coil. It also avoids energy loss, ensures the reliability of the induction heater 21, and improves its service life. This can reduce or eliminate the need for mechanical strip descaling equipment.

[0039] Understandably, in the aforementioned material-bearing section, the belt 221 runs parallel to the strip's running direction to ensure that the belt 221 can reliably and completely catch the iron oxide scale that detaches from the strip's surface. The width of the belt 221 should preferably be greater than the maximum bandwidth of the steel grade being produced, in order to accommodate the production needs of different steel grades.

[0040] More preferably, such as Figure 2 The belt conveyor includes two sets of belt guide rollers 223 arranged on both sides of the induction heater 21 along the running direction of the strip, and the two sets of belt guide rollers 223 define the material receiving section. The two sets of belt guide rollers 223 ensure the tension of the belt 221 in the material receiving section, preventing the belt 221 from jumping and causing iron oxide scale to spill. On the other hand, they turn the belt 221 to facilitate the removal of the iron oxide scale it receives.

[0041] More preferably, such as Figure 2The belt conveyor also includes two sets of scrapers 222 arranged on both sides of the induction heater 21 along the running direction of the strip. The scrapers 222 are located below the belt guide rollers 223 on the corresponding sides and are in contact with the material-bearing surface of the belt 221. The scrapers 222 can clean the iron oxide scale on the surface of the belt 221, preventing the iron oxide scale from sticking to the material-bearing surface and the back of the belt 221 (during the winding process of the belt 221, the iron oxide scale on a certain section of the belt 221 may stick to the back of the adjacent belt 221). Furthermore, an adsorption chamber can be provided on the scraper 222 and an adsorption groove can be provided at the cutter head of the scraper 222. By generating a negative pressure suction effect in the adsorption chamber, the scraped iron oxide scale is sucked away through the adsorption groove, ensuring the continuous operation of the scraper 222 and preventing the iron oxide scale from falling to the winding station of the belt 221 below.

[0042] The aforementioned belt conveyor can ensure continuous operation by employing methods such as belt 221 circulating; in another embodiment, such as Figure 2 The belt conveyor includes two sets of belt unwinding units 224 arranged on both sides of the induction heater 21 along the running direction of the strip. The belt unwinding units 224 are arranged below the belt guide rollers 223 on the corresponding sides, and the two ends of the belt 221 are respectively wound in the two sets of belt unwinding units 224. For the above-mentioned scheme with scraper 222, the belt unwinding units 224 can be arranged below the scraper 222 on the corresponding side. The belt winding unit 224 can adopt a structure in which a winding crankshaft and a winding motor cooperate. Specifically, the belt winding unit 224 on the inlet side of the induction heater 21 and the belt winding unit 224 on the outlet side of the induction heater 21 adopt a periodic operation mode. During the operation of the winding motor on the inlet side, the winding crankshaft on the outlet side is in a free state to automatically transport the belt 221. After the belt 221 on the winding crankshaft on the outlet side reaches the specified belt 221 position, the winding motor on the outlet side is put into operation, the winding motor on the inlet side stops operating, the winding crankshaft on the inlet side is in a free state to automatically transport the belt 221, and the belt 221 is transported in the reverse direction.

[0043] In an optional embodiment, baffles can be provided on both sides of the aforementioned material-bearing section. These baffles can be straight plates with their surfaces parallel to the vertical direction, with the edges of the belt 221 contacting the surfaces of the corresponding baffles; or the baffles can be L-shaped plates, comprising a first plate with its surface parallel to the vertical direction and a second plate with its surface parallel to the horizontal direction, with the edges of the belt 221 contacting the surfaces of the corresponding first plate, and the back / bottom surface of the belt 221 contacting the upper surface of the second plate. These baffles not only effectively prevent iron oxide scale from falling onto the belt 221 but also guide the belt 221's movement, improving its operational stability; the L-shaped baffles are particularly effective, resulting in better belt stability. In the above-mentioned scheme with a support layer, the baffles can be fixed to the support layer, for example, integrally formed with the support layer.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An environmentally friendly continuous annealing system for strip steel, comprising an annealing furnace, wherein a low-NOx radiant tube burner is arranged inside the annealing furnace, characterized in that: An electromagnetic induction preheating device is arranged on the inlet side of the annealing furnace, and a catalytic denitrification device is arranged on the flue gas pipeline of the annealing furnace. The electromagnetic induction preheating device includes an induction heater, which employs a closed-loop induction coil and forms a strip running channel within the coil. The induction heater is equipped with a translation drive mechanism, thus having a working position and an offline position. It also includes a belt conveyor, the belt travel path of which includes a material-bearing section, in which the belt passes through the induction heating chamber of the induction heater and is located directly below the strip running channel; The belt conveyor also includes two sets of scrapers arranged on both sides of the induction heater along the running direction of the strip steel. The scrapers are located below the belt guide rollers on the corresponding sides and are in contact with the material bearing surface of the belt. An emergency shear is provided on the inlet or outlet side of the working position of the induction heater. Roller frames are arranged on the inlet side and outlet side of the workstation, respectively. The roller frames are equipped with idlers for supporting the strip steel and pressure rollers located directly above the idlers. The pressure rollers are equipped with pressure roller lifting drive units, and the emergency shear is integrated and installed on the roller frames on the corresponding sides. The induction heater has an induction heating chamber, and the idler roller and the pressure roller cooperate to define the running height of the strip so that the strip is at the center height of the induction heating chamber; During the operation of the annealing furnace, the overall nitrogen oxide emissions of the furnace section are controlled to the lowest level and the overall efficiency is optimized through the annealing furnace radiant tube heating section model decision system and combustion optimization control system.

2. The environmentally friendly continuous strip annealing system as described in claim 1, characterized in that: The catalytic denitrification device includes a deaerator, a catalytic denitrification device, and a decarbonization device connected in series through a flue gas pipeline. The deaerator is equipped with a gas supply pipe, and the catalytic denitrification device is an SCR denitrification device.

3. The environmentally friendly continuous strip annealing system as described in claim 2, characterized in that: The decarbonizer is equipped with a decarbonization catalyst and an oxygen supply pipe.

4. The environmentally friendly continuous strip annealing system as described in claim 2, characterized in that: A heat exchanger is also installed on the flue gas duct on the outlet side of the decarbonizer, and the medium supply pipe of the low-NOx radiant tube burner is connected to the heat exchanger.

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