A sintering endpoint transverse deviation self-adaptive correction closed-loop linkage regulation method

Abstract

The application discloses a sintering endpoint transverse deviation self-adaptive correction closed-loop linkage regulation method, which comprises the following steps: (1) dividing a sintering machine trolley and the like into several independent partitions, and building a machine tail multi-point waste gas temperature array detection system; (2) taking the current running reference trolley speed V0 of the sintering machine as the basis, combining the global sintering endpoint average offset and a correction weight coefficient k, and iteratively solving an optimal correction reference speed V1 in real time; (3) adopting an independent fuzzy PID control algorithm, and smoothly regulating the trolley speed to the optimal correction reference speed in stages; (4) enabling the upstream and downstream matched equipment to be synchronously adjusted at a fixed speed ratio; (5) establishing a deviation accumulation gradient compensation mechanism to eliminate the accumulated deviation; and (6) monitoring a disturbance working condition in real time, built-in feedforward compensation strategy, and setting a three-stage transverse deviation sound-light early warning mechanism. The application greatly reduces the endpoint transverse difference and stabilizes the sinter quality.

Description

Technical Field

[0001] This invention relates to the field of belt sintering machine technology, and specifically to a closed-loop linkage control method for adaptive correction of lateral deviation at the sintering endpoint. Background Technology

[0002] The belt sintering machine is a core raw material preparation equipment for blast furnace ironmaking. The 330m² large-scale sintering machine trolley has a transverse width of up to 5.5m and a normal operating material layer thickness of 1020mm, featuring wide width, large capacity, and continuous production with thick material layers. The sintering endpoint (BTP) is the core process indicator for judging the degree of vertical sintering completion of the material layer. Under ideal conditions, the vertical sintering speed is consistent in all transverse areas of the trolley, and the sintering endpoint is uniformly and stably located in the range of the second to third bellows from the end of the machine.

[0003] However, in actual wide-width sintering production, due to the combined effects of multiple factors such as edge heat dissipation effect, uneven thickness of transverse material, transverse temperature difference of the ignition furnace, differences in air permeability of different areas, and inconsistent transverse distribution of air leakage at the tail of the machine, there are significant differences in the vertical sintering speed of the left, left-middle, center, right-middle, and right sides of the trolley. This directly results in transverse deviation of the sintering endpoint: the edge area dissipates heat quickly and has a lower vertical sintering speed, resulting in a significant delay in the sintering endpoint; the center area has concentrated heat storage and a faster sintering speed, resulting in an earlier sintering endpoint, with the maximum transverse endpoint position deviation reaching 3 to 6 meters.

[0004] The unevenness of the sintering endpoint will lead to the following production defects: 1) If the sintering endpoint is reached in advance, it will result in under-burning of the regional material layer, low strength of sinter, more powder, and increased return rate; 2) If the endpoint is delayed, it will result in over-burning and melting of the regional material layer, deterioration of material layer permeability, increase of main pump load, and increase of gas and electricity consumption; 3) The continuous existence of the lateral endpoint gradient will cause sinter quality stratification, large fluctuations in the composition and strength of sinter fed into the furnace, and increased pressure on the blast furnace.

[0005] Existing sintering endpoint control technologies can be mainly classified into the following categories, but all of them have obvious defects and shortcomings: 1) Globally unified single-speed adjustment mode for trolleys Traditional control schemes only collect the average exhaust gas temperature at the tail end of the sintering machine, calculate the average endpoint position across the entire area, and achieve endpoint correction by uniformly increasing / decreasing the speed of the entire machine trolley, without any lateral partition identification or differentiated control logic.

[0006] Defects: It can only correct the average endpoint offset and cannot eliminate the difference in endpoints of the lateral zones; if the endpoint of the central zone is advanced and the endpoint of the edge zone is delayed, the speed increase of the whole machine will aggravate the underburning of the edge zone, and the speed decrease of the whole machine will cause serious overburning of the central zone. Only a compromise can be made, and the deviation of the lateral endpoint cannot be cured in the long term; a single large speed change will cause a sudden change in the speed of the entire mixing belt, the ring cooler, and the bottom material laying system, causing fluctuations in the material level of the silo and drift of the dry basis ratio of the batching, forming a chain of process oscillations.

[0007] 2) Passive compensation for lateral deviation by relying on fabric fine-tuning The industry-standard optimization method is to manually adjust the transverse material distribution gate of the material feeder, and then finely adjust the vertical sintering speed by locally increasing or decreasing the material layer thickness, thereby indirectly reducing the transverse difference at the endpoint.

[0008] Disadvantages: The adjustment is extremely lagging, and it takes at least 30 minutes for the effect to be seen at the end of the machine after the gate is adjusted; it requires manual intervention based on the experience of the operator and cannot adapt to fluctuations in raw materials and working conditions in real time; the effect of fine-tuning the material distribution is limited under thick material layer conditions, and it can only reduce the lateral deviation within 1m, and has no significant improvement on the gradient deviation of more than 3m for wide-width sintering machines; frequent adjustment of the material distribution gate will cause fluctuations in the lateral dry basis composition of the mixture, and reduce the alkalinity and total iron stability.

[0009] 3) Tilt-free speed multi-device linkage fault-tolerant mechanism Some zone damper adjustment schemes only adjust the negative pressure of each lateral zone exhaust, without coordinating with the trolley travel speed for control; and all speed change strategies use a one-time step speed correction without linking with the batching, cooling, and return systems for synchronous gradient following. The instantaneous output of the trolley changes during speed change, the overshoot of the batching loss-in-weight scale flow, and the disorder of the cooling system of the cooling system, further amplifying the fluctuations in sintering conditions; and there is a lack of lateral deviation graded early warning and adaptive smoothing correction logic, which can easily lead to process loss of control after exceeding the threshold.

[0010] It is evident that existing technologies cannot achieve accurate identification and adaptive smooth correction of lateral deviation at the sintering endpoint. Furthermore, the lack of upstream and downstream equipment linkage constraints in trolley speed adjustment makes it difficult to guarantee the long-term production stability and consistency of sintered ore products in a wide-width 330m² sintering machine. Therefore, developing a closed-loop linkage control method for adaptive correction of lateral deviation at the sintering endpoint has become an urgent problem to be solved. Summary of the Invention

[0011] The technical problem to be solved by this invention is to provide a closed-loop linkage control method for adaptive correction of lateral deviation at the sintering endpoint. This method realizes real-time field modeling of the lateral five-zone endpoint of the sintering trolley, quantitative classification of lateral deviation of each zone, adaptive correction of the trolley's reference speed, synchronous gradient linkage of batching / circular cooling / returning equipment, and fault-tolerant smooth speed regulation under varying working conditions. It balances the lateral and vertical sintering speeds from the perspective of travel speed, significantly reduces the lateral difference at the endpoint, stabilizes the quality of sintered ore, and reduces energy consumption and return rate.

[0012] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The innovative aspect of the present invention's adaptive correction closed-loop linkage control method for sintering endpoint lateral deviation lies in including the following steps: (1) Divide the sintering machine trolley into several independent zones along the transverse width direction, build a multi-point exhaust gas temperature array detection system at the tail of the machine, calculate the real-time sintering endpoint position of each zone, and set the sintering standard target endpoint range. (2) Divide the lateral deviation into three gradient intervals, and preset the corresponding trolley speed adaptive correction weight coefficient for each gradient interval; then, based on the current operating benchmark trolley speed V0 of the sintering machine, combine the average offset of the sintering endpoint across the entire domain. And correct the weight coefficient k, and iteratively solve for the optimal corrected baseline speed V1 in real time; (3) The main drive frequency converter of the trolley adopts an independent fuzzy PID control algorithm to calculate the actual travel speed of the trolley every 50ms. The speed deviation and rate of change of the deviation from the optimal correction reference speed V1 are measured, and the trolley speed is smoothly controlled to the optimal correction reference speed V1 in stages by dynamically tuning the three sets of PID proportional, integral and derivative parameters online through fuzzy inference. (4) Establish a fixed linkage speed ratio model of trolley reference speed and supporting equipment speed, so that the upstream and downstream supporting equipment can be synchronously adjusted in small increments according to a fixed speed ratio; (5) After the speed adjustment is completed, continuously collect real-time data of the endpoint of each partition and recalculate the maximum lateral gradient difference of the entire domain. And establish a cumulative deviation gradient compensation mechanism to eliminate cumulative deviation; (6) Real-time monitoring of disturbance conditions, built-in feedforward compensation strategy, setting up a three-level lateral deviation audible and visual early warning mechanism and implementing corresponding fault-tolerant control strategies.

[0013] Preferably, in step (1) above, a 330m match is used. 2 The sintering machine trolley has a lateral width of 5.5m. The sintering machine trolley is divided into five independent monitoring zones along the lateral width direction: left side zone, left middle zone, center zone, right middle zone, and right side zone. The lateral width of each zone is 1.1m.

[0014] Preferably, in step (1) above, the construction of the multi-point exhaust gas temperature array detection system at the tail end, the calculation of the real-time sintering endpoint position of each zone, and the setting of the sintering standard target endpoint interval specifically include: (1.1) Four K-type high-temperature thermocouples are symmetrically arranged in each section of the 1# to 4# wind boxes at the tail of the sintering machine to form a horizontal temperature measurement array, with a total of 20 temperature measurement points in the whole area. The temperature time sequence data of the exhaust gas in each section is collected in real time with a collection period of 50ms, and the temperature measurement accuracy is ±2℃. (1.2) Based on the exhaust gas temperature curves of each zone, the BRP combustion rise point algorithm is used to calculate the real-time sintering endpoint position of each zone independently in real time, generate the lateral two-dimensional distribution field of the sintering endpoint, and quantitatively output the endpoint position of each zone, the longitudinal deviation between each zone and the target endpoint, and the lateral gradient difference between the zones. (1.3) Set the target endpoint range for sintering: the middle of the second-to-last air box at the tail of the sintering machine, the target endpoint reference position L0, the allowable basic deviation of a single zone is ±0.8m, and the maximum allowable gradient difference between zones is ≤1.2m.

[0015] Preferably, in step (2) above, the real-time sintering endpoint positions of the five partitions are read in real time. Calculate the endpoint deviation for each partition separately. Simultaneously, solve for the global maximum lateral gradient difference. ,in For different The real-time sintering endpoint position of any other partition; then according to The lateral deviation is divided into three gradient intervals, including: (2.1) When 1.2m < When the deviation is ≤2.0m, it is judged as a first-level minor deviation, and the correction weighting coefficient k=0.03. (2.2) When 2.0m < When the deviation is less than 3.5m, it is judged as a level 2 moderate deviation, and the correction weighting coefficient k=0.07. (2.3) When When the deviation is ≥3.5m, it is judged as a level three serious deviation, and the correction weighting coefficient k=0.12.

[0016] Preferably, in step (2) above, the optimal correction reference speed... ,in, c is the compensation coefficient, and it is a fixed process constant of 0.25. In addition, for the typical asymmetric gradient where the endpoint of the central region is significantly advanced and the endpoint of the edge region is severely delayed, a zone-differentiated compensation factor needs to be introduced to first reduce the difference in the lateral gradient, and then correct the average offset of the sintering endpoint across the entire region.

[0017] Preferably, in step (3) above, the logic for smoothly adjusting the trolley speed to the optimal correction reference speed V1 in stages is as follows: (3.1) When the speed deviation is >0.08m / min, it is judged as a large deviation. At this time, the PID proportional is 0.6, integral is 7s and derivative is 1.1s, which is dynamically tuned online by fuzzy inference to quickly correct the small deviation. (3.2) When the speed deviation is between 0.03 and 0.08 m / min, it is judged as a moderate deviation. At this time, the PID is dynamically tuned online by fuzzy inference with a proportional of 0.3, an integral of 10s, and a derivative of 0.5s for smooth adjustment. (3.3) When the speed deviation is <0.03m / min, it is judged to be near steady state. At this time, the PID is dynamically tuned online by fuzzy inference with a proportional of 0.15, an integral of 15s, and a derivative of 0.2s to maintain a fine steady state. (3.4) The speed adjustment range of a single trolley must be ≤0.04m / min.

[0018] Preferably, in step (4) above, the upstream and downstream supporting equipment includes a batching loss-in-weight belt, an annular cooler trolley, a return ore conveyor belt, and a bottom material feeder. After each smoothing correction of the trolley speed, a gradient speed adjustment command is synchronously issued to the upstream and downstream supporting equipment, so that the upstream and downstream supporting equipment can synchronously and slightly follow the adjustment at a fixed speed ratio. The speed adjustment range of all upstream and downstream supporting equipment is synchronously limited to the upper limit of a single adjustment with the sintering trolley. The adjustment logic is as follows: (4.1) Weight loss belt: The flow rate of the weight loss belt is linearly linked with the speed of the trolley. Based on the total flow rate of dry-based mixture = hourly dry-based production coefficient × trolley speed, the target feed flow rate of each raw material wet-based mixture is synchronously corrected. Then, it is linked with the dry-based precise batching closed-loop system mentioned above to update the output of the batching model in real time and offset the fluctuation of the total amount of mixture caused by speed change. (4.2) Ring cooler trolley: The speed ratio between the ring cooler trolley and the sintering machine trolley is fixed at 1:1.05, and the speed is synchronously gradient-regulated to ensure stable cooling time of sinter. (4.3) Return ore conveyor belt and bottom material feeder: The speed of the return ore conveyor belt and the bottom material feeder are linked together at a fixed speed ratio of 0.98.

[0019] Preferably, in step (5) above, the establishment of the deviation accumulation gradient compensation mechanism is as follows: if there is a lateral gradient deviation in the same direction for 15 minutes, a small additional speed compensation coefficient is superimposed, and the trolley reference speed is slowly corrected in multiple times; the lateral gradient difference of the partition is first guaranteed to be controlled within 1.2m, and then the average endpoint of the whole domain is converged to the standard target endpoint interval.

[0020] Preferably, in step (6) above, the disturbance conditions include gas pressure, ignition furnace lateral temperature, mixture moisture content, material layer thickness, main pump negative pressure, and raw material composition fluctuation. The feedforward compensation strategy is as follows: when the raw material, heating, and negative pressure parameters fluctuate significantly in advance, the trolley reference speed base value is pre-adjusted to suppress the generation of the endpoint lateral deviation in advance.

[0021] Preferably, in step (6) above, setting up a three-level lateral deviation audible and visual early warning mechanism and implementing corresponding fault-tolerant control strategies specifically involves: (6.1) When When the distance is greater than 2.0m, a level 1 pop-up warning will be displayed. (6.2) When When the distance is greater than 3.5m, set it to a level two audible and visual alarm; (6.3) When When the altitude is greater than 5.0m, a Level III severe warning is issued. (6.4) If a Level 3 severe warning is triggered, fault-tolerant control will be activated. At this time, large-scale speed correction will be suspended, and the air-fuel ratio adjustment of the ignition furnace zone and the lateral fine adjustment of the material distribution will be coordinated to assist in temperature control, and the lateral endpoint deviation will be eliminated step by step.

[0022] The beneficial effects of this invention are: (1) This invention realizes real-time field modeling of the endpoint of the five transverse zones of the sintering trolley, quantitative classification of transverse deviation of the zones, adaptive correction of the trolley reference speed, synchronous gradient linkage of batching / circular cooling / returning equipment, and fault-tolerant smooth speed regulation under different working conditions. It balances the transverse and vertical sintering speed from the perspective of travel speed, greatly reduces the transverse difference at the endpoint, stabilizes the quality of sintered ore, and reduces energy consumption and return rate. (2) This invention can accurately identify and significantly reduce the lateral gradient deviation at the sintering endpoint. By using five-zone array temperature measurement + BRP endpoint modeling, the lateral endpoint difference is quantified. The lateral and vertical sintering speeds are balanced by smooth speed change of the trolley, which solves the defect of the center being ahead and the edge area being behind in the layered sintering. The lateral quality uniformity of the sintered ore is significantly improved. (3) This invention solves the process contradiction of uniform speed change of the whole machine. The reasonable control logic breaks the traditional single control idea of ​​only correcting the average endpoint. It prioritizes the convergence of the gradient difference of the lateral partition and then corrects the average endpoint of the whole domain. Through graded deviation weight differential speed correction, it avoids the contradiction of local overburning and underburning caused by simply increasing / decreasing speed, and takes into account the dual process objectives of the endpoint of the whole domain and lateral uniformity. (4) The present invention features a proportional linkage speed regulation of the entire process equipment, eliminating the chain oscillation of the process. It establishes a synchronous gradient linkage model between the sintering trolley and the batching, cooling and return ore systems. The trolley smoothly changes speed in a small amount to synchronously correct the dry basis ratio of the mixture and the belt flow rate, eliminating the fluctuations in material level, ratio and cooling system caused by speed change. The coupling stability of the control system is greatly improved, solving the defects of the existing technology that cause the entire process disorder by adjusting the speed alone. (5) This invention significantly reduces production consumption and return ore, and improves economic benefits. After the horizontal endpoint is uniform, the underburned powder at the sintering edge is reduced, the overburned melting in the center is suppressed, the overall return ore rate decreases, and the power consumption is reduced; the sinter drum strength fluctuation is reduced, and the blast furnace coke ratio is slightly reduced. (6) The present invention has a high degree of automation, reduces the reliance on manual intervention and online real-time closed-loop adaptive correction throughout the process, and eliminates the need for operators to manually adjust the cloth gate and judge the lateral distribution of the endpoint based on experience, thus eliminating the lag and subjective error of manual operation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the principle of the adaptive correction closed-loop linkage control method for sintering endpoint lateral deviation according to the present invention. Detailed Implementation

[0025] The technical solution of the present invention will be clearly and completely described below through specific embodiments.

[0026] The present invention provides an adaptive correction closed-loop linkage control method for sintering endpoint lateral deviation, such as... Figure 1 As shown, it includes the following steps: (1) Divide the sintering machine trolley into several independent zones along the transverse width direction, build a multi-point exhaust gas temperature array detection system at the tail of the machine, calculate the real-time sintering endpoint position of each zone, and set the sintering standard target endpoint range.

[0027] In the above steps, match 330m 2 The sintering machine trolley has a lateral width of 5.5m. The sintering machine trolley is divided into five independent monitoring zones along the lateral width direction: left side zone, left middle zone, center zone, right middle zone, and right side zone. The lateral width of each zone is 1.1m.

[0028] This invention establishes a multi-point exhaust gas temperature array detection system at the tail end of the machine, calculates the real-time sintering endpoint position of each zone, and sets the sintering standard target endpoint interval, specifically including: (1.1) Four K-type high-temperature thermocouples are symmetrically arranged in each section of the 1# to 4# wind boxes at the tail of the sintering machine to form a horizontal temperature measurement array, with a total of 20 temperature measurement points in the whole area. The temperature time sequence data of the exhaust gas in each section is collected in real time with a collection period of 50ms, and the temperature measurement accuracy is ±2℃. (1.2) Based on the exhaust gas temperature curve of each zone, the BRP combustion rise point algorithm is used to calculate the real-time sintering endpoint position of each zone independently in real time, generate the horizontal two-dimensional distribution field of the sintering endpoint, and quantify the output of the endpoint position of each zone, the longitudinal deviation between each zone and the target endpoint, and the horizontal gradient difference between the zones, so as to ensure that there is no detection blind spot and to identify the gradient distribution characteristics of the center being ahead and the edge zone being behind in real time. (1.3) Set the target endpoint range for sintering: the middle of the second-to-last air box at the tail of the sintering machine, the target endpoint reference position L0, the allowable basic deviation of a single zone is ±0.8m, and the maximum allowable gradient difference between zones is ≤1.2m.

[0029] (2) Divide the lateral deviation into three gradient intervals, and preset the corresponding trolley speed adaptive correction weight coefficient for each gradient interval; then, based on the current operating benchmark trolley speed V0 of the sintering machine, combine the average offset of the sintering endpoint across the entire domain. And the corrected weight coefficient k, and the optimal corrected baseline speed V1 is solved in real time through iterative calculation.

[0030] This invention reads the real-time sintering endpoint positions of five partitions. Calculate the endpoint deviation for each partition separately. Simultaneously, solve for the global maximum lateral gradient difference. ,in For different The real-time sintering endpoint position of any other partition; then according to The lateral deviation is divided into three gradient intervals, including: (2.1) When 1.2m < When the deviation is ≤2.0m, it is judged as a first-level minor deviation, and the correction weighting coefficient k=0.03. (2.2) When 2.0m < When the deviation is less than 3.5m, it is judged as a level 2 moderate deviation, and the correction weighting coefficient k=0.07. (2.3) When When the deviation is ≥3.5m, it is judged as a level three serious deviation, and the correction weighting coefficient k=0.12.

[0031] The optimal correction reference speed of this invention ,in, c is the compensation coefficient, and it is a fixed process constant of 0.25. In addition, for the typical asymmetric gradient where the endpoint of the central region is significantly advanced and the endpoint of the edge region is severely delayed, it is also necessary to introduce a zone-differentiated compensation factor to weaken the process contradiction caused by the single machine speed change, prioritize reducing the lateral gradient difference, and then correct the average offset of the sintering endpoint of the whole domain.

[0032] (3) The main drive frequency converter of the trolley adopts an independent fuzzy PID control algorithm to calculate the actual travel speed of the trolley every 50ms. The speed deviation and rate of change of the optimal correction reference speed V1 are measured, and the trolley speed is smoothly controlled to the optimal correction reference speed V1 in stages by dynamically tuning the three sets of PID proportional, integral and derivative parameters online through fuzzy inference.

[0033] The specific logic of this invention for smoothly adjusting the trolley speed to the optimal correction reference speed V1 in stages is as follows: (3.1) When the speed deviation is >0.08m / min, it is judged as a large deviation. At this time, the PID proportional is 0.6, integral is 7s and derivative is 1.1s, which is dynamically tuned online by fuzzy inference to quickly correct the small deviation. (3.2) When the speed deviation is between 0.03 and 0.08 m / min, it is judged as a moderate deviation. At this time, the PID is dynamically tuned online by fuzzy inference with a proportional of 0.3, an integral of 10s, and a derivative of 0.5s for smooth adjustment. (3.3) When the speed deviation is <0.03m / min, it is judged to be near steady state. At this time, the PID is dynamically tuned online by fuzzy inference with a proportional of 0.15, an integral of 15s, and a derivative of 0.2s to maintain a fine steady state. (3.4) The speed adjustment range of a single trolley must be ≤0.04m / min. Step-by-step speed changes are prohibited to avoid sudden changes in the material layer's permeability caused by sudden changes in time.

[0034] (4) Establish a fixed linkage speed ratio model of the trolley reference speed and the rotation speed of the supporting equipment, so that the upstream and downstream supporting equipment can be adjusted synchronously and slightly according to the fixed speed ratio.

[0035] The aforementioned upstream and downstream supporting equipment includes a batching loss-in-weight belt, annular cooler trolley, return ore conveyor belt, and bottom material feeder. After each smoothing correction of the trolley speed, a gradient speed adjustment command is simultaneously issued to the upstream and downstream supporting equipment, causing them to adjust synchronously and slightly according to a fixed speed ratio. The speed adjustment range of all upstream and downstream supporting equipment is limited to the upper limit of a single adjustment synchronously with the sintering trolley, achieving full production line coupling and linkage between sintering trolley, batching, annular cooler, and return material, preventing process disconnection caused by speed changes in a single piece of equipment. The specific adjustment logic is as follows: (4.1) Weight loss belt: The flow rate of the weight loss belt is linearly linked with the speed of the trolley. Based on the total flow rate of dry-based mixture = hourly dry-based production coefficient × trolley speed, the target feed flow rate of each raw material wet-based mixture is synchronously corrected. Then, it is linked with the dry-based precise batching closed-loop system mentioned above to update the output of the batching model in real time and offset the fluctuation of the total amount of mixture caused by speed change. (4.2) Ring cooler trolley: The speed ratio between the ring cooler trolley and the sintering machine trolley is fixed at 1:1.05, and the speed is synchronously gradient-regulated to ensure stable cooling time of sinter. (4.3) Return ore conveyor belt and bottom material feeder: The speed of the return ore conveyor belt and bottom material feeder is linked at a fixed speed ratio of 0.98 to avoid instantaneous material accumulation and material interruption in the silo.

[0036] (5) After the speed adjustment is completed, continuously collect real-time data of the endpoint of each partition and recalculate the maximum lateral gradient difference of the entire domain. This forms a complete closed-loop control link of "horizontal temperature array acquisition - zoned endpoint calculation - deviation classification modeling - trolley speed correction - full-process linkage speed regulation - endpoint secondary detection gradient compensation", and establishes a deviation accumulation gradient compensation mechanism to eliminate accumulated deviation.

[0037] The present invention establishes a deviation accumulation gradient compensation mechanism as follows: if there is a lateral gradient deviation in the same direction for 15 consecutive minutes, a small additional speed compensation coefficient is superimposed to slowly correct the trolley reference speed in multiple stages, gradually smoothing out the accumulated lateral endpoint offset caused by long-term material laying, ignition, and air leakage; priority is given to ensuring that the lateral gradient difference of the partition is controlled within 1.2m, and then the average endpoint of the whole domain is converged to the standard target endpoint interval, changing the traditional control logic of prioritizing the correction of the average endpoint.

[0038] (6) Real-time monitoring of disturbance conditions, built-in feedforward compensation strategy, setting up a three-level lateral deviation audible and visual early warning mechanism and implementing corresponding fault-tolerant control strategies.

[0039] The disturbance conditions of this invention include gas pressure, lateral temperature of the ignition furnace, moisture content of the mixture, thickness of the material layer, negative pressure of the main pump, and fluctuation of raw material composition. The feedforward compensation strategy is as follows: when the raw material, heating, and negative pressure parameters fluctuate significantly in advance, the baseline value of the trolley speed is pre-adjusted to suppress the generation of lateral deviation at the endpoint.

[0040] The present invention sets up a three-level lateral deviation audio-visual early warning mechanism and executes corresponding fault-tolerant control strategies as follows: (6.1) When When the distance is greater than 2.0m, a level 1 pop-up warning will be displayed. (6.2) When When the distance is greater than 3.5m, set it to a level two audible and visual alarm; (6.3) When When the altitude is greater than 5.0m, a Level III severe warning is issued. (6.4) If a Level 3 severe warning is triggered, fault-tolerant control will be activated. At this time, large-scale speed correction will be suspended, and the air-fuel ratio adjustment of the ignition furnace zone and the lateral fine adjustment of the material distribution will be coordinated to assist in temperature control. The lateral endpoint deviation will be eliminated step by step to avoid the severe oscillation of the sintering condition caused by a single speed regulation exceeding the limit, and to ensure the continuous and stable operation of the unit.

[0041] Example For a single wide-width belt sintering machine with an effective sintering area of ​​330m², the effective transverse width of the trolley is 5.5m, the normal baseline trolley speed V0 = 2.95m / min, the stable material layer thickness is 1020mm, and the target endpoint reference position L0 is set at the middle of the second-to-last air box at the tail of the sintering machine. Without this solution, uneven transverse sintering is a common problem, with the maximum transverse gradient difference reaching 3.5–5.0m under temperature conditions, resulting in poor production stability.

[0042] The present invention provides a closed-loop linkage control method for adaptive correction of lateral deviation at the sintering endpoint, comprising the following steps: (1) Divide the sintering machine trolley equally along the transverse width into five independent monitoring zones: left side zone, left middle zone, center zone, right middle zone, and right side zone. The transverse width of each zone is 1.1m. Four K-type high-temperature thermocouples are symmetrically arranged in each section of the 1st to 4th air boxes at the tail end of the sintering machine, totaling 20 temperature measurement points. The exhaust gas temperature data of each section is collected in real time with a 50ms acquisition period. Based on the exhaust gas temperature curves of each section, the BRP combustion rise point algorithm is used to independently calculate the real-time sintering endpoint position of each section, generating a two-dimensional horizontal distribution field of the sintering endpoint. The results quantify and output the endpoint position of each section, the longitudinal deviation between each section and the target endpoint, and the horizontal gradient difference between the sections. The real-time sintering endpoint position in the left zone is L1 = L0 + 2.0m (lagging by 2.0m); the real-time sintering endpoint position in the left middle zone is L2 = L0 + 1.1m (lagging by 1.1m); the real-time sintering endpoint position in the center zone is L3 = L0 - 1.5m (advancing by 1.5m); the real-time sintering endpoint position in the right middle zone is L4 = L0 + 1.0m (lagging by 1.0m); the real-time sintering endpoint position in the right zone is L5 = L0 + 1.9m (lagging by 1.9m). (2) Real-time reading of the sintering endpoint positions of the five zones, and calculation of the endpoint deviation for each zone, i.e., endpoint deviation ΔL1 = 2.0m for the left zone, ΔL2 = 1.1m for the left-middle zone, and ΔL3 = 1.1m for the center zone. 1.5m, right-center zone endpoint deviation ΔL4=1.0m, right-side zone endpoint deviation ΔL5=1.9m; ​​simultaneously solve for the average offset of the entire sintering endpoint. That is, the overall sintering endpoint is delayed by 0.9m; at the same time, the maximum transverse gradient difference across the entire domain is solved. It is determined to be a level three severe deviation, and the corrected weighting coefficient k=0.12.

[0043] Based on the current operating benchmark trolley speed V0 of the sintering machine, and combined with the average offset of the sintering endpoint across the entire range... And correct the weight coefficient k, and iteratively solve for the optimal corrected baseline speed in real time. The theoretical calculations above indicate that the overall endpoint is delayed, requiring a slight increase in the trolley speed and a shortening of the sintering time.

[0044] Considering that this working condition is a typical asymmetric lateral deviation (i.e., the center is ahead and the sides are severely lagging), in order to avoid directly increasing the speed and aggravating the underburning defect in the edge area, a differentiated compensation constraint is activated to smoothly correct the theoretical speed. A step-by-step small-amplitude speed adjustment strategy is adopted, with a single adjustment amount not exceeding 0.04 m / min.

[0045] (3) The main drive frequency converter of the trolley adopts an independent fuzzy PID control algorithm to calculate the actual travel speed of the trolley every 50ms. The speed deviation and rate of change of the optimal correction reference speed V1 are measured, and the PID proportional, integral, and derivative parameters are dynamically tuned online through fuzzy inference to smoothly control the trolley speed in stages. The first stage increases the speed to 2.99 m / min and maintains it in a steady state for 3 minutes; the second stage fine-tunes it to 3.03 m / min. The speed regulation is smooth and shock-free throughout, effectively avoiding oscillations during sintering.

[0046] (4) Establish a fixed linkage speed ratio model for the trolley reference speed and the rotational speed of the supporting equipment. The trolley speed is increased by 1.03% relative to the speed of the trolley. The upstream and downstream supporting equipment are synchronously linked and adjusted according to the fixed speed ratio, specifically as follows: (4.1) Material loss belt: The material loss system synchronously increases the total dry basis flow rate of the mixture by 1.03% and automatically refreshes the target flow rate of each raw material wet basis to ensure the stability of the composition, basicity and total iron of the sintering mixture; (4.2) Ring cooler trolley: The ring cooler is synchronously accelerated at a speed ratio of 1:1.05 to ensure that the cooling system of sinter remains unchanged; (4.3) Return ore conveyor belt and bottom material feeder: The return ore conveyor belt and bottom material feeder are synchronized and adjusted in speed, and the material level fluctuation is controlled within ±5%, with no abnormal material accumulation or material interruption.

[0047] (5) After the speed adjustment is completed, collect the real-time data of the endpoint of each partition again, namely L1=L0+0.6m, L2=L0+0.2m, L3=L0-0.3m, L4=L0+0.1m, L5=L0+0.5m, and recalculate the maximum lateral gradient difference of the whole domain. The control threshold of less than 1.2m was observed, with an average endpoint offset of only 0.02m across the entire range. The lateral uniformity and overall position of the sintering endpoint both reached the optimal process range. There was no cumulative deviation for 15 consecutive minutes, indicating good steady-state operation of the system.

[0048] The beneficial effects of this invention are: (1) This invention realizes real-time field modeling of the endpoint of the five transverse zones of the sintering trolley, quantitative classification of transverse deviation of the zones, adaptive correction of the trolley reference speed, synchronous gradient linkage of batching / circular cooling / returning equipment, and fault-tolerant smooth speed regulation under different working conditions. It balances the transverse and vertical sintering speed from the perspective of travel speed, greatly reduces the transverse difference at the endpoint, stabilizes the quality of sintered ore, and reduces energy consumption and return rate. (2) This invention can accurately identify and significantly reduce the lateral gradient deviation at the sintering endpoint. By using five-zone array temperature measurement + BRP endpoint modeling, the lateral endpoint difference is quantified. The lateral and vertical sintering speeds are balanced by smooth speed change of the trolley, which solves the defect of the center being ahead and the edge area being behind in the layered sintering. The lateral quality uniformity of the sintered ore is significantly improved. (3) This invention solves the process contradiction of uniform speed change of the whole machine. The reasonable control logic breaks the traditional single control idea of ​​only correcting the average endpoint. It prioritizes the convergence of the gradient difference of the lateral partition and then corrects the average endpoint of the whole domain. Through graded deviation weight differential speed correction, it avoids the contradiction of local overburning and underburning caused by simply increasing / decreasing speed, and takes into account the dual process objectives of the endpoint of the whole domain and lateral uniformity. (4) The present invention features a proportional linkage speed regulation of the entire process equipment, eliminating the chain oscillation of the process. It establishes a synchronous gradient linkage model between the sintering trolley and the batching, cooling and return ore systems. The trolley smoothly changes speed in a small amount to synchronously correct the dry basis ratio of the mixture and the belt flow rate, eliminating the fluctuations in material level, ratio and cooling system caused by speed change. The coupling stability of the control system is greatly improved, solving the defects of the existing technology that cause the entire process disorder by adjusting the speed alone. (5) This invention significantly reduces production consumption and return ore, and improves economic benefits. After the horizontal endpoint is uniform, the underburned powder at the sintering edge is reduced, the overburned melting in the center is suppressed, the overall return ore rate decreases, and the power consumption is reduced; the sinter drum strength fluctuation is reduced, and the blast furnace coke ratio is slightly reduced. (6) The present invention has a high degree of automation, reduces the reliance on manual intervention and online real-time closed-loop adaptive correction throughout the process, and eliminates the need for operators to manually adjust the cloth gate and judge the lateral distribution of the endpoint based on experience, thus eliminating the lag and subjective error of manual operation.

[0049] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, all modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the technical requirements.

Claims

1. A closed-loop linkage control method for adaptive correction of lateral deviation at the sintering endpoint, characterized in that... Includes the following steps: (1) Divide the sintering machine trolley into several independent zones along the transverse width direction, build a multi-point exhaust gas temperature array detection system at the tail of the machine, calculate the real-time sintering endpoint position of each zone, and set the sintering standard target endpoint range. (2) Divide the lateral deviation into three gradient intervals, and preset the corresponding trolley speed adaptive correction weight coefficient for each gradient interval; then, based on the current operating benchmark trolley speed V0 of the sintering machine, combine the average offset of the sintering endpoint across the entire domain. And correct the weight coefficient k, and iteratively solve for the optimal corrected baseline speed V1 in real time; (3) The main drive frequency converter of the trolley adopts an independent fuzzy PID control algorithm to calculate the actual travel speed of the trolley every 50ms. The speed deviation and rate of change of the deviation from the optimal correction reference speed V1 are measured, and the trolley speed is smoothly controlled to the optimal correction reference speed V1 in stages by dynamically tuning the three sets of PID proportional, integral and derivative parameters online through fuzzy inference. (4) Establish a fixed linkage speed ratio model of trolley reference speed and supporting equipment speed, so that the upstream and downstream supporting equipment can be synchronously adjusted in small increments according to a fixed speed ratio; (5) After the speed adjustment is completed, continuously collect real-time data of the endpoint of each partition and recalculate the maximum lateral gradient difference of the entire domain. And establish a cumulative deviation gradient compensation mechanism to eliminate cumulative deviation; (6) Real-time monitoring of disturbance conditions, built-in feedforward compensation strategy, setting up a three-level lateral deviation audible and visual early warning mechanism and implementing corresponding fault-tolerant control strategies.

2. The sintering endpoint lateral deviation adaptive correction closed-loop linkage control method according to claim 1, characterized in that: In step (1) above, 330m is matched. 2 The sintering machine trolley has a lateral width of 5.5m. The sintering machine trolley is divided into five independent monitoring zones along the lateral width direction: left side zone, left middle zone, center zone, right middle zone, and right side zone. The lateral width of each zone is 1.1m.

3. The adaptive correction closed-loop linkage control method for sintering endpoint lateral deviation according to claim 2, characterized in that: In step (1) above, the construction of the multi-point exhaust gas temperature array detection system at the tail end, the calculation of the real-time sintering endpoint position of each zone, and the setting of the sintering standard target endpoint interval specifically include: (1.1) Four K-type high-temperature thermocouples are symmetrically arranged in each section of the 1# to 4# wind boxes at the tail of the sintering machine to form a horizontal temperature measurement array, with a total of 20 temperature measurement points in the whole area. The temperature time sequence data of the exhaust gas in each section is collected in real time with a collection period of 50ms, and the temperature measurement accuracy is ±2℃. (1.2) Based on the exhaust gas temperature curves of each zone, the BRP combustion rise point algorithm is used to calculate the real-time sintering endpoint position of each zone independently in real time, generate the lateral two-dimensional distribution field of the sintering endpoint, and quantitatively output the endpoint position of each zone, the longitudinal deviation between each zone and the target endpoint, and the lateral gradient difference between the zones. (1.3) Set the target endpoint range for sintering: the middle of the second-to-last air box at the tail of the sintering machine, the target endpoint reference position L0, the allowable basic deviation of a single zone is ±0.8m, and the maximum allowable gradient difference between zones is ≤1.2m.

4. The adaptive correction closed-loop linkage control method for sintering endpoint lateral deviation according to claim 3, characterized in that: In step (2) above, the real-time sintering endpoint positions of the five partitions are read in real time. Calculate the endpoint deviation for each partition separately. Simultaneously, solve for the global maximum lateral gradient difference. ,in For different The real-time sintering endpoint position of any other partition; then according to The lateral deviation is divided into three gradient intervals, including: (2.1) When 1.2m < When the deviation is ≤2.0m, it is judged as a first-level minor deviation, and the correction weighting coefficient k=0.

03. (2.2) When 2.0m < When the deviation is less than 3.5m, it is judged as a level 2 moderate deviation, and the correction weighting coefficient k=0.

07. (2.3) When When the deviation is ≥3.5m, it is judged as a level three serious deviation, and the correction weighting coefficient k=0.

12.

5. The sintering endpoint lateral deviation adaptive correction closed-loop linkage control method according to claim 4, characterized in that: In step (2) above, the optimal correction reference speed ,in, c is the compensation coefficient, and it is a fixed process constant of 0.

25. In addition, for the typical asymmetric gradient where the endpoint of the central region is significantly advanced and the endpoint of the edge region is severely delayed, a zone-differentiated compensation factor needs to be introduced to first reduce the difference in the lateral gradient, and then correct the average offset of the sintering endpoint across the entire region.

6. The adaptive correction closed-loop linkage control method for sintering endpoint lateral deviation according to claim 1, characterized in that: In step (3) above, the logic for smoothly adjusting the trolley speed to the optimal correction reference speed V1 in stages is as follows: (3.1) When the speed deviation is >0.08m / min, it is judged as a large deviation. At this time, the PID proportional is 0.6, integral is 7s and derivative is 1.1s, which is dynamically tuned online by fuzzy inference to quickly correct the small deviation. (3.2) When the speed deviation is between 0.03 and 0.08 m / min, it is judged as a moderate deviation. At this time, the PID is dynamically tuned online by fuzzy inference with a proportional of 0.3, an integral of 10s, and a derivative of 0.5s for smooth adjustment. (3.3) When the speed deviation is <0.03m / min, it is judged to be near steady state. At this time, the PID is dynamically tuned online by fuzzy inference with a proportional of 0.15, an integral of 15s, and a derivative of 0.2s to maintain a fine steady state. (3.4) The speed adjustment range of a single trolley must be ≤0.04m / min.

7. The sintering endpoint lateral deviation adaptive correction closed-loop linkage control method according to claim 1, characterized in that: In step (4) above, the upstream and downstream supporting equipment includes a batching weightless belt, an annular cooler trolley, a return ore conveyor belt, and a bottom material feeder. After each smoothing correction of the trolley speed, a gradient speed adjustment command is synchronously issued to the upstream and downstream supporting equipment, so that the upstream and downstream supporting equipment can synchronously and slightly follow the adjustment according to a fixed speed ratio. The speed adjustment range of all upstream and downstream supporting equipment is synchronously limited to the upper limit of a single adjustment with the sintering trolley. The adjustment logic is as follows: (4.1) Weight loss belt: The flow rate of the weight loss belt is linearly linked with the speed of the trolley. Based on the total flow rate of dry-based mixture = hourly dry-based production coefficient × trolley speed, the target feed flow rate of each raw material wet-based mixture is synchronously corrected. Then, it is linked with the dry-based precise batching closed-loop system mentioned above to update the output of the batching model in real time and offset the fluctuation of the total amount of mixture caused by speed change. (4.2) Ring cooler trolley: The speed ratio between the ring cooler trolley and the sintering machine trolley is fixed at 1:1.05, and the speed is synchronously gradient-regulated to ensure stable cooling time of sinter. (4.3) Return ore conveyor belt and bottom material feeder: The speed of the return ore conveyor belt and bottom material feeder is linked at a fixed speed ratio of 0.

98.

8. The sintering endpoint lateral deviation adaptive correction closed-loop linkage control method according to claim 1, characterized in that: In step (5) above, the establishment of the deviation accumulation gradient compensation mechanism is as follows: if there is a lateral gradient deviation in the same direction for 15 minutes, a small additional speed compensation coefficient is superimposed, and the trolley reference speed is slowly corrected in multiple times; priority is given to ensuring that the lateral gradient difference of the partition is controlled within 1.2m, and then the average endpoint of the whole domain is converged to the standard target endpoint interval.

9. The adaptive correction closed-loop linkage control method for sintering endpoint lateral deviation according to claim 1, characterized in that: In step (6) above, the disturbance conditions include gas pressure, ignition furnace lateral temperature, mixture moisture content, material layer thickness, main pump negative pressure, and raw material composition fluctuation. The feedforward compensation strategy is: when the raw material, heating, and negative pressure parameters fluctuate significantly in advance, the trolley reference speed base value is pre-adjusted to suppress the generation of the endpoint lateral deviation in advance.

10. The sintering endpoint lateral deviation adaptive correction closed-loop linkage control method according to claim 9, characterized in that: In step (6) above, the specific steps for setting up a three-level lateral deviation audible and visual early warning mechanism and implementing the corresponding fault-tolerant control strategy are as follows: (6.1) When When the distance is greater than 2.0m, a level 1 pop-up warning will be displayed. (6.2) When When the distance is greater than 3.5m, set it to a level two audible and visual alarm; (6.3) When When the altitude is greater than 5.0m, a Level III severe warning is issued. (6.4) If a Level 3 severe warning is triggered, fault-tolerant control will be activated. At this time, large-scale speed correction will be suspended, and the air-fuel ratio adjustment of the ignition furnace zone and the lateral fine adjustment of the material distribution will be coordinated to assist in temperature control, and the lateral endpoint deviation will be eliminated step by step.

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