Optimization control method and system for stabilizing sintering end point section

Abstract

The invention relates to the technical field of sintering production process control, and discloses an optimization control method and system for stabilizing a sintering end point cross section, and the method comprises the steps: obtaining the sintering end point distance of each interval of a current cross section and the stroke of each pressure plate above a round roller feeder; when the sintering end point distance of part of the intervals is smaller than the preset sintering end point distance, whether the stroke of a pressure plate in the current interval reaches the upper limit or not is judged, the consistency of the sintering end point position and the end point section is adjusted by coordinately controlling the stroke of the pressure plate and the valve opening degree of a main exhaust fan, so that the sintering end point is controlled at the target position; controlling the strokes of the material pressing plates in all the intervals to change the thickness of a material layer and adjust the sintering time of the material layer from top to bottom in a longitudinal adjusting mode, and adjusting the opening degree of a valve of the main exhaust fan to change the final position state of the whole section of the sintering trolley at the same time in a transverse adjusting mode. And by comprehensively considering the longitudinal dimension and the transverse dimension, coordinated optimization adjustment of the target position and the section consistency of the sintering end point is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of sintering production process control, and particularly relates to an optimized control method and system for stabilizing the sintering end cross-section. Background Art

[0002] Sintered ore, as the main furnace charge for blast furnaces, accounts for about 60%-70% of the iron-containing raw materials in blast furnaces. The fluctuation of its quality directly affects the smooth operation of blast furnace production and energy consumption. Therefore, stable and high-quality sintered ore is the key to achieving high output, low consumption, and low cost in the blast furnace ironmaking production process. To ensure the quality of sintered ore, it is particularly important to accurately detect and optimize the sintering production process. By improving the product quality of the sintering system, not only can the production efficiency of blast furnaces be increased, but also the production cost can be effectively reduced, enhancing the market competitiveness of enterprises.

[0003] With the rapid development of modern industry, the automation equipment of the sintering system has been basically improved, forming an efficient production process. To obtain high-quality sintered ore, during the production process, it is necessary to finely adjust the thickness of the material layer on the trolley and the speed of the sintering trolley to ensure that the sintering end position remains at the target distance, while taking into account good cross-sectional consistency. However, the actual sintering production is affected by various factors. Simply controlling the trolley speed and thickness is difficult to achieve precise control of the ideal end position, and there is a lag. This not only affects the quality of sintered ore but also may lead to a decrease in the production efficiency of blast furnaces. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an optimized control method and system for stabilizing the sintering end cross-section.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: An optimized control method for stabilizing the sintering end cross-section, comprising the steps of: Obtain the sintering end distances of each interval of the current cross-section and the strokes of each pressure plate above the round roll feeder; When the sintering end distance La of some intervals is less than the preset sintering end distance Ls, judge the current end distance deviation level K: , When the end distance deviation level K≤5%, increase the stroke of the pressure plate in the current interval. If the stroke of the interval pressure plate reaches the upper limit, then decrease the valve opening of the main exhaust fan and increase the feeding amount, so that the maximum error area deviating from the preset sintering end tends to the target parameter; When the end distance deviation is 5%<K≤15%, decrease the valve opening of the main exhaust fan, and simultaneously monitor whether the pressure plate reaches the upper limit. If it does not reach the upper limit, simultaneously increase the stroke of the pressure plate in the current interval; When the end - point distance deviation level K > 15%, it indicates that the sintering system is operating abnormally, and the optimized control method for the sintering end - point cross - section cannot be enabled. The system is regulated by the on - site sintering technicians.

[0006] When the sintering end - point distance La in some intervals is greater than the preset sintering end - point distance Ls, judge the current end - point distance deviation level K. When the end - point distance deviation level K ≤ 5%, reduce the travel of the pressure plate in the current interval; if the travel of the interval pressure plate reaches the lower limit, increase the valve opening of the main exhaust fan, so that the maximum error area deviating from the preset sintering end - point tends to the target parameter. When the end - point distance deviation is 5% < K ≤ 15%, increase the valve opening of the main exhaust fan, synchronously monitor whether the pressure plate reaches the lower limit. If it does not reach the lower limit, synchronously reduce the travel of the pressure plate in the current interval, and perform raw material moisture compensation during the primary mixing process of the raw materials.

[0007] When the end - point distance deviation level K > 15%, it indicates that the sintering system is operating abnormally, and the optimized control method for the sintering end - point cross - section cannot be enabled. The system is regulated by the on - site sintering technicians.

[0008] In the present invention, preferably, the obtaining of the sintering end - point distances of each interval of the current cross - section includes: Obtain the sintering cross - section images of each interval; Perform edge detection on the sintering cross - section images to determine the actual position coordinates of the sintering front. X u ; Combined with the mapping relationship between the image pixels and the actual physical size, calculate the sintering end - point distance. a u : a u = X u * L u , In the formula L u is the actual length corresponding to a unit pixel.

[0009] Establish the spatial mapping relationship between the above - mentioned sintering end - point distance La and the sintering end - point distance a u The sintering end - point distance is finally calculated as a f : a f = ω * a i +(1 - ω) * a u , wherein ω is the confidence index of the temperature data.

[0010] In the present invention, preferably, it further includes:[[]] Obtaining the height of each material layer in the cross-section of the sintering trolley, and determining whether the absolute value of the difference between the current height of each material layer and the height of the material layer corresponding to the target end position is less than a given threshold; When the absolute value of the height of the material layer and the height of the material layer corresponding to the target end position is less than the given threshold, keep the currently set stroke value of the pressure plate unchanged; Otherwise, adjust the stroke of the pressure plate according to the stroke correspondence table.

[0011] In the present invention, preferably, obtaining the target height of the interval material layer includes: According to the sintering end distance L (m), the sintering trolley speed v (m / min), calculate the sintering time t (min), according to the vertical sintering speed V1 (m / min) multiplied by the sintering time t (min), to obtain the target height of the interval material layer; The vertical sintering speed V1 (m / min) is the average value of the vertical sintering speeds V1 ’ and V1 ’’ of the previous two cycles.

[0012] In the present invention, preferably, when the height of the interval material layer is consistent with the target height, judge the current sintering end anomaly coefficient S: S = ΔD / ΔDs, where ΔD is the real-time distance deviation and ΔDs is the process requirement set deviation; When S≥1.0, the sintering end is abnormal, Judge whether the air volume is within the process requirement range. When the air volume is within the process requirement range, perform air box opening adjustment, optimize the air volume distribution, and correct the sintering end; When the air volume is not within the process requirement range, adjust the main fan power, correct the air volume to the process range, synchronously distribute the air box opening, and correct the sintering end; When S<1.0, the sintering end is normal, and the current parameters are maintained.

[0013] In the present invention, preferably, when the height of the interval material layer is inconsistent with the target height, judge the current sintering end anomaly coefficient S: When S≥1.0, the sintering end is abnormal, Judge whether the stroke of the pressure plate in the current interval reaches the limit. When the stroke of the pressure plate does not reach the limit, adjust the stroke L of the pressure plate to correct the sintering end; When the stroke of the pressure plate reaches the limit, control the air volume to correct the sintering end point; When the sintering end point returns to normal, correct the height of the material layer in the current interval in combination with the stroke of the pressure plate and the air volume parameter; When S < 1.0, the sintering end point is normal. Combine the stroke of the pressure plate and the air volume parameter to correct the height of the current material layer.

[0014] In the present invention, preferably, it further includes establishing a valve opening K of the main exhaust fan i and the maximum valve opening K max The corresponding table of the absolute value of the difference and the opening value of the adjustment range of the valve opening, and the absolute value is proportional to the adjustment range value; Adjust the valve opening of the main exhaust fan according to the corresponding table of the opening.

[0015] An optimized control system for stabilizing the sintering end point cross-section includes a cycle control unit, which triggers the first detection unit to detect the sintering end point distance of each interval of the cross-section and the second detection unit to detect the stroke of each pressure plate above the round roller feeder at a fixed period. The first detection unit is used to detect the sintering end point distance of each interval of the current cross-section; The second detection unit is used to detect the stroke of each pressure plate above the round roller feeder; The first judgment unit is used to judge whether the current sintering end point distance is less than the preset sintering end point distance; The second judgment unit is used to judge whether the current stroke of the pressure plate reaches the upper limit or the lower limit; The adjustment unit obtains adjustment data by comparing according to the judgment result, the corresponding table of the opening and the corresponding table of the stroke. The adjustment data is used to adjust the valve opening of the main exhaust fan and the stroke of the pressure plate.

[0016] In the present invention, preferably, the adjustment unit includes a first adjustment module, a second adjustment module, a third adjustment module and a fourth adjustment module. When the stroke of the pressure plate in the current interval does not reach the upper limit, the first adjustment module increases the stroke of the pressure plate in this interval according to the corresponding table of the stroke, so that this interval deviates from the preset sintering end point and tends to the target distance; When the sintering end point distance of some intervals in the current cross-section is less than the preset sintering end point distance, and the stroke of the pressure plate in the current interval has reached the upper limit, the second adjustment module reduces the valve opening of the main exhaust fan according to the corresponding table of the opening, so that the maximum error area deviating from the preset sintering end point tends to the target distance; When the sintering end point distance of some intervals in the current cross-section is greater than the preset sintering end point distance, and the current stroke of the pressure plate does not reach the lower limit, the third adjustment module reduces the stroke of the pressure plate in this interval according to the corresponding table of the stroke to reduce the feeding amount, so that this interval deviates from the preset sintering end point and tends to the target distance; When the sintering end point distance in a partial interval of the current cross-section is greater than the preset sintering end point distance, and the current pressure plate stroke has reached the lower limit, the fourth adjustment module increases the valve opening of the main exhaust fan according to the opening corresponding table, so that the maximum error area deviating from the preset sintering end point tends to the target distance.

[0017] In the present invention, preferably, it further includes a third detection unit for detecting the height of each material layer in the cross-section of the sintering trolley. A third judgment unit, which is used to judge whether the absolute value of the difference between the current height of each material layer and the height of the material layer corresponding to the target end position is less than a given threshold. When the absolute value is less than the given threshold, the current set pressure plate stroke remains unchanged. Otherwise, the stroke of the pressure plate is adjusted according to the stroke adjustment table.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The method of the present invention adjusts the sintering end point position and the consistency of the end cross-section by coordinately controlling two parameters, namely the pressure plate stroke and the valve opening of the main exhaust fan, so that the sintering end point is controlled at the target position. Controlling the pressure plate stroke in each interval can change the material layer thickness, and further adjust the sintering time from top to bottom of the material layer, which is a longitudinal adjustment method of the end point position. Adjusting the valve opening of the main exhaust fan can change the end point position state of the entire cross-section of the sintering trolley at the same time, which is a horizontal adjustment method of the end point position. This control method comprehensively considers from the longitudinal and horizontal dimensions of the sintering material, and realizes the coordinated optimization adjustment of the sintering end point target position and cross-section consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the sintering system.

[0020] Figure 2 It is a schematic flow chart of an optimized control method for stabilizing the sintering end point cross-section according to the present invention.

[0021] Figure 3 It is a schematic structural diagram of an optimized control system for stabilizing the sintering end point cross-section according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] Please refer to Figure 2 , a preferred embodiment of the present invention provides an optimized control method for stabilizing the sintering end cross-section, which is mainly used in the processing process of sintered ore. The technological process of the sintering system includes multiple links such as batching, blending, feeding, trolley, ignition, sintering, crushing, and screening, as shown in Figure 1 . Each link has an important impact on the quality of the final product. For example, a temperature measuring device 1 is installed in the air box below the sintering trolley to monitor the temperature change in real time. In area 2 near the sintering end, the temperature measuring devices inside the air box are more densely distributed in a matrix form to ensure precise temperature control. In addition, a monitoring image device 3 installed at the tail of the sintering machine can observe the distribution of the cross-section at the tail of the sintering machine online, and discover and solve potential problems in a timely manner. During the sintering production process, the granulation effect is usually optimized by controlling the moisture content of the mixed material; the rotation speeds of the round roller 4 and the nine-roller 5 are adjusted to improve the segregation of the feeding; the stroke of the pressure plate above the round roller 6 is changed to increase or decrease the thickness of the material layer on the trolley; the vertical sintering speed of the mixed material on the trolley is controlled by adjusting the damper opening 7 of the main induced draft fan.

[0025] Combined with the current situation of the sintering material, the valve opening of the main induced draft fan and the stroke of the pressure plate are controlled in real time, so that the sintering end of the sintering material in each interval is maintained at the target distance, while taking into account good cross-sectional consistency, and improving the quality and output of sintered ore.

[0026] Embodiment 1, an optimized control method specifically includes the following steps:

[0027] S1. Obtain the sintering end distances of each interval of the current cross-section and the strokes of each pressure plate above the round roller feeder.

[0028] The sintering end distance refers to the distance between the sintering end and the initial position where the sintering material starts to sinter. Generally, in order to ensure the quality of sintered ore, different types of sintering materials have their own preset minimum sintering end distances b min, however, in the actual sintering production process, numerous sintering factors will affect the sintering speed, thereby resulting in a mismatch between the actual sintering end point distance and the preset sintering end point distance Ls. Therefore, the purpose of this step is to calculate the sintering end point distance La for each interval of the current cross-section as the basis for subsequent control. The specific steps for calculating the sintering end point distance La for each interval of the current cross-section are as follows: obtain the sintering cross-section images for each interval; Perform edge detection on the sintering cross-section images to determine the actual position coordinates of the sintering front X u ; Combine the mapping relationship between image pixels and actual physical dimensions to calculate the sintering end point distance a u : a u = X u * L u , wherein L u is the actual length corresponding to a unit pixel.

[0029] Establish the spatial mapping relationship between the above-mentioned sintering end point distance La and the sintering end point distance a u , and finally calculate the sintering end point distance La: La = ω * a i +(1 - ω) * a u , wherein ω is the credibility index of the temperature data.

[0030] Obtain the stroke of each pressure plate above the round roller feeder. By communicating with the PLC (Programmable Logic Controller) or DCS (Distributed Control System), the stroke data of the pressure plate can be obtained in real time Y i当前 .

[0031] S21. When the sintering end point distance La of some intervals is less than the preset sintering end point distance Ls, judge the current end point distance deviation level K: , When the end point distance deviation level K ≤ 5%, increase the stroke of the pressure plate in the current interval. If the stroke of the interval pressure plate reaches the upper limit, then reduce the valve opening of the main induced draft fan and increase the feeding amount, so that the maximum error area deviating from the preset sintering end point tends to the target parameter; While keeping other production control parameters unchanged, increasing the stroke of the pressure plate in a certain interval will increase the thickness of the material layer in that intervalH 料， While maintaining the vertical sintering speed of the existing section V1 i (m / min), the vertical sintering time of the burden layer will increase so that the sintering end point of the current section tends to the preset sintering end point b avr .

[0032] Generally, when the stroke of the pressure plate in a certain section reaches the maximum value, it is no longer possible to improve the situation of the current sintering end point advancing early by adjusting the burden layer thickness. By means of reducing the valve opening of the main exhaust fan, the vertical sintering speed of each section of the sintering cross-section can be reduced V1 i (m / min), so that the maximum error area deviating from the preset sintering end point tends to the target distance, improving the utilization efficiency of the air volume and reducing the energy consumption; furthermore, in the next cycle, it is possible to continue to adjust the sintering end point distance by means of the stroke of the sectional pressure plate, so that the sintering end points of each section tend to the preset sintering end point.

[0033] S22. When the sintering end point distance La of some sections is greater than the preset sintering end point distance Ls, judge the current end point distance deviation level K, When the end point distance deviation level K ≤ 5%, reduce the stroke of the pressure plate in the current section; if the stroke of the sectional pressure plate reaches the lower limit, increase the valve opening of the main exhaust fan so that the maximum error area deviating from the preset sintering end point tends to the target parameter; When the end point distance deviation is 5% < K ≤ 15%, increase the valve opening of the main exhaust fan, synchronously monitor whether the pressure plate reaches the lower limit. If it does not reach the lower limit, synchronously reduce the stroke of the pressure plate in the current section and perform raw material moisture compensation.

[0034] When the stroke of the pressure plate in a certain section reaches the minimum value, it is no longer possible to improve the situation of the current sintering end point advancing early by adjusting the burden layer thickness. By means of increasing the valve opening of the main exhaust fan, the operating efficiency of the sintering machine production line can be improved as a whole by increasing the air volume, and the vertical sintering speed of each section of the sintering cross-section can be increased V1 i (m / min), so that the maximum error area deviating from the preset sintering end point tends to the target distance; furthermore, in the next cycle, it is possible to continue to adjust the sintering end point distance by means of the stroke of the sectional pressure plate, so that the sintering end points of each section tend to the preset sintering end point.

[0035] Embodiment 2. This embodiment provides a method for adjusting the valve opening of the main exhaust fan, which specifically includes: S201. Establish the valve opening K of the current main exhaust fan i and the maximum valve opening K maxCorresponding table of the absolute value of the difference and the adjustment amplitude value of the valve opening, where the absolute value is proportional to the adjustment amplitude value.

[0036] S202. Adjust the valve opening of the main exhaust fan according to the corresponding table.

[0037] The adjustment in this step includes two operations: increasing and decreasing. Taking the reduction of the valve opening of the main exhaust fan in step S106 of Embodiment 1 as an example, the specific adjustment method can be referred to as follows: When occurs, the valve opening of the main exhaust fan decreases by 3 degrees every 60 seconds.

[0038] When occurs, the valve opening of the main exhaust fan decreases by 2 degrees every 60 seconds.

[0039] When occurs, the valve opening of the main exhaust fan decreases by 1 degree every 60 seconds.

[0040] Taking the increase of the valve opening of the main exhaust fan in step S109 of Embodiment 1 as an example, the specific adjustment method can be referred to as follows: When occurs, the valve opening of the main exhaust fan increases by 1 degree every 60 seconds.

[0041] When occurs, the valve opening of the main exhaust fan increases by 2 degrees every 60 seconds.

[0042] When occurs, the valve opening of the main exhaust fan increases by 3 degrees every 60 seconds.

[0043] The above increase or decrease of the valve opening of the main exhaust fan is only a specific implementation manner. In the actual adjustment process, the adjustment amplitude value or the adjustment basis can be set separately, and is not limited to the above-set adjustment limit values.

[0044] In the method provided in Embodiment 2 of the present invention, a corresponding table of the absolute value of the difference between the valve opening of the main exhaust fan and the maximum valve opening and the adjustment amplitude value of the valve opening is established. The absolute value of the difference between the valve opening of the main exhaust fan and the maximum valve opening is proportional to the adjustment amplitude value of the valve opening. That is to say, the closer the difference between the valve opening of the main exhaust fan and the maximum valve opening is, and when the adjustment amplitude value deviates from the maximum valve opening, the adjustment amplitude value decreases from large to small to ensure the adjustment accuracy; the greater the difference between the valve opening of the main exhaust fan and the maximum valve opening is, and when the adjustment amplitude value continuously approaches the maximum valve opening, the adjustment amplitude value decreases from large to small to improve the adjustment efficiency; this adjustment method can adjust the valve opening value of the main exhaust fan specifically according to the current valve opening of the main exhaust fan, taking into account both the adjustment accuracy and the adjustment efficiency.

[0045] Embodiment 3 provides a method for obtaining the height of each material layer in the cross-section of a sintering trolley, and determining whether the absolute value of the difference between the current height of each material layer and the height of the corresponding material layer at the target end position is less than a given threshold. When the absolute value of the difference between the material layer height and the height of the corresponding material layer at the target end position is less than the given threshold, the current set travel value of the pressure plate is kept unchanged; otherwise, the travel of the pressure plate is adjusted according to the travel correspondence table.

[0046] Obtaining the target height of the interval material layer includes: According to the sintering end distance L (meters), and the speed of the sintering trolley v (meters per minute), the sintering time t (minutes) is calculated. According to the vertical sintering speed V1 (meters per minute) multiplied by the sintering time t (minutes), the target height of the interval material layer is obtained. The vertical sintering speed V1 (meters per minute) is the average value of the vertical sintering speeds V1 ' and V1 '' in the previous two cycles.

[0047] When the height of the interval material layer is consistent with the target height, the current sintering end anomaly coefficient S is judged: S = ΔD / ΔDs, where ΔD is the real-time distance deviation and ΔDs is the process requirement setting deviation; When S ≥ 1.0, the sintering end is abnormal. It is judged whether the air volume is within the process requirement range. When the air volume is within the process requirement range, the damper opening is adjusted to optimize the air volume distribution and correct the sintering end; When the air volume is not within the process requirement range, the main fan power is adjusted to correct the air volume to the process range, and the damper opening is synchronously distributed to correct the sintering end; When S < 1.0, the sintering end is normal, and the current parameters are maintained.

[0048] When the height of the interval material layer is inconsistent with the target height, the current sintering end anomaly coefficient S is judged: When S ≥ 1.0, the sintering end is abnormal, It is judged whether the travel of the pressure plate in the current interval reaches the limit. When the travel of the pressure plate does not reach the limit, the travel of the pressure plate L is adjusted to correct the sintering end; When the travel of the pressure plate reaches the limit, the air volume is controlled to correct the sintering end; When the sintering end returns to normal, the height of the current interval material layer is corrected in combination with the travel of the pressure plate and the air volume parameters; When S < 1.0, the sintering end is normal, The height of the current material layer is corrected in combination with the travel of the pressure plate and the air volume parameters.

[0049] Example 4. The specific method for adjusting the stroke of the blank holder in each interval provided in this Example 4 includes: S301. Establish the current stroke P of the blank holder in the interval i and the maximum stroke P max of the blank holder, and establish a stroke correspondence table between the absolute value of the difference and the adjustment amplitude value of the blank holder stroke, where the absolute value is proportional to the adjustment amplitude value.

[0050] S302. Adjust the stroke of the blank holder in the interval according to the stroke correspondence table.

[0051] The adjustment in this step includes two operations: increasing and decreasing. To increase the stroke of the blank holder in the interval, the specific adjustment can be made with reference to the following method: When , the stroke of the blank holder in the interval increases by 0.5 cm every 30 seconds.

[0052] When , the stroke of the blank holder in the interval increases by 1 cm every 30 seconds.

[0053] When , the stroke of the blank holder in the interval increases by 1.5 cm every 30 seconds.

[0054] To decrease the stroke of the blank holder in the interval, the specific adjustment can be made with reference to the following method: When , the stroke of the blank holder in the interval decreases by 1.5 cm every 30 seconds.

[0055] When , the stroke of the blank holder in the interval decreases by 1 cm every 30 seconds.

[0056] When , the stroke of the blank holder in the interval decreases by 0.5 cm every 30 seconds.

[0057] The above methods of increasing or decreasing the stroke of the blank holder in the interval are only specific implementation methods. In the actual adjustment process, the adjustment amplitude value or the adjustment basis can be set separately, and it is not limited to the above-set adjustment limit values.

[0058] In the method provided in the fourth embodiment of the present invention, a correspondence table is established between the absolute value of the difference between the interval pressure plate stroke and the maximum value of the pressure plate stroke and the adjustment amplitude value of the pressure plate stroke. The absolute value of the difference between the interval pressure plate stroke and the maximum value of the pressure plate stroke is proportional to the adjustment amplitude value of the pressure plate stroke. That is to say, when the absolute value of the difference between the interval pressure plate stroke and the maximum value of the pressure plate stroke is closer, and the adjustment amplitude value deviates from the maximum value of the pressure plate stroke, the adjustment amplitude value decreases from large to small to ensure the adjustment accuracy; when the absolute value of the difference between the interval pressure plate stroke and the maximum value of the pressure plate stroke is larger, and the adjustment amplitude value continuously approaches the maximum value of the pressure plate stroke, the adjustment amplitude value decreases from large to small to improve the adjustment efficiency; this adjustment method can adjust the interval pressure plate stroke of the next cycle according to the current interval pressure plate stroke, taking into account both the adjustment accuracy and the adjustment efficiency.

[0059] For Embodiment Five, please refer to Figure 3 , this embodiment provides an optimized control system for stabilizing the sintering end cross-section, including a cycle control unit that triggers the first detection unit to detect the sintering end distance of each interval of the cross-section and the second detection unit to detect the stroke of each pressure plate above the round roll feeder at a fixed period.

[0060] The first detection unit is used to detect the sintering end distance of each interval of the current cross-section. The sintering end distance refers to the distance between the sintering end and the initial position where the sintering material starts sintering. Usually, in order to ensure the quality of sintered ore, different types of sintering materials have their own preset sintering end distances Ls. However, in the actual sintering production process, many sintering factors will affect the sintering speed, resulting in the actual sintering end distance not matching the preset sintering end distance Ls. Therefore, the purpose of the first detection unit is to detect the sintering end distance La of each interval of the current cross-section as the basis for subsequent control. The specific detection method is to collect the exhaust gas temperature detection values of each interval, fit the exhaust gas temperature detection values into a quadratic curve, and obtain the coordinates of the maximum point of the curve ( X i , Y i ), and the sintering end distance of each interval = X i * The length of the wind box (unit: m).

[0061] The second detection unit is communicatively connected to the PLC (Programmable Logic Controller) or DCS (Distributed Control System) at the sintering site and can obtain the stroke data of each pressure plate above the round roll feeder in real time; The first judgment unit is used to judge whether the current sintering end distance is less than the preset sintering end distance; The second judgment unit is used to judge whether the current pressure plate stroke reaches the upper limit or the lower limit; The adjustment unit obtains adjustment data by comparing according to the judgment result, the opening degree correspondence table and the stroke correspondence table, and the adjustment data is used to adjust the valve opening degree of the main exhaust fan and the stroke of the pressure plate.

[0062] Specifically, the adjustment unit includes a first adjustment module, a second adjustment module, a third adjustment module and a fourth adjustment module. When the stroke of the pressure plate in the current interval does not reach the upper limit, the first adjustment module increases the stroke of the pressure plate in this interval according to the stroke correspondence table, so that this interval deviates from the preset sintering end point and tends to the target distance. Generally, when other production control parameters remain unchanged, increasing the stroke of the pressure plate in a certain interval will increase the thickness of the material layer in this interval H 料 , while maintaining the existing vertical sintering speed in the current interval V1 i (m / min), the vertical sintering time of the material layer will increase, so that the sintering end point in the current interval tends to the preset sintering end point.

[0063] When the sintering end point distance in some intervals on the current cross-section is less than the preset sintering end point distance, and the stroke of the pressure plate in the current interval has reached the upper limit, the second adjustment module reduces the valve opening degree of the main exhaust fan according to the opening degree correspondence table, so that the maximum error area deviating from the preset sintering end point tends to the target distance. When the stroke of the pressure plate in a certain interval reaches the maximum value, it is no longer possible to improve the situation that the current sintering end point is advanced by adjusting the material layer thickness. By means of reducing the valve opening degree of the main exhaust fan, the vertical sintering speed of each interval in the sintering cross-section can be reduced V1 i (m / min), so that the maximum error area deviating from the preset sintering end point tends to the target distance, improving the utilization efficiency of the air volume and reducing energy consumption; furthermore, in the next cycle, it is possible to continue to adjust the sintering end point distance by means of the stroke of the interval pressure plate, so that the sintering end points of each interval tend to the preset sintering end point.

[0064] When the sintering end point distance in some intervals on the current cross-section is greater than the preset sintering end point distance, and the current stroke of the pressure plate has not reached the lower limit, the third adjustment module reduces the stroke of the pressure plate in this interval according to the stroke correspondence table to reduce the feeding amount, so that this interval deviates from the preset sintering end point and tends to the target distance. When other production control parameters remain unchanged, reducing the stroke of the pressure plate in a certain interval will reduce the thickness of the material layer in this interval H 料 , while maintaining the existing vertical sintering speed in the current interval V1 i (m / min), the vertical sintering time of the material layer will decrease, so that the sintering end point in the current interval tends to the preset sintering end point.

[0065] When the sintering end distance in a partial interval of the current cross-section is greater than the preset sintering end distance, and the current pressure plate stroke has reached the lower limit, the fourth adjustment module increases the valve opening of the main exhaust fan according to the opening corresponding table, so that the maximum error area deviating from the preset sintering end approaches the target distance.

[0066] In this embodiment, it further includes a third detection unit for detecting the height of each material layer in the cross-section of the sintering trolley. A third judgment unit, which is used to judge whether the absolute value of the difference between the current height of each material layer and the height of the corresponding material layer at the target end position is less than a given threshold. When the absolute value is less than the given threshold, keep the current set pressure plate stroke unchanged. Otherwise, adjust the stroke of the pressure plate according to the stroke adjustment table.

[0067] In some other preferred embodiments of the present invention, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the processor is made to execute the steps of the method as described in the above embodiments.

[0068] If the above functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical disks and other various media that can store program codes.

[0069] The above description is a detailed description of the preferred and feasible embodiments of the present invention, but the embodiments are not used to limit the patent application scope of the present invention. Any equivalent changes or modifications made under the technical spirit disclosed by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A method for optimizing and controlling a stable sintering end point cross section, characterized in that: Including the steps: Obtain the sintering end-point distances of each interval of the current cross-section and the strokes of each pressure plate above the round roller feeder; When the sintering end-point distance La of some intervals is less than the preset sintering end-point distance Ls, judge the current end-point distance deviation level K: ， When the end-point distance deviation level K ≤ 5%, increase the stroke of the pressure plate in the current interval. If the stroke of the interval pressure plate reaches the upper limit, then decrease the valve opening of the main exhaust fan, increase the feeding amount, so that the maximum error area deviating from the preset sintering end-point tends to the target parameter; When the range of the end-point distance deviation level K is 5% < K ≤ 15%, decrease the valve opening of the main exhaust fan, and synchronously monitor whether the pressure plate reaches the upper limit. If it does not reach the upper limit, synchronously increase the stroke of the pressure plate in the current interval; When the sintering end-point distance La of some intervals is greater than the preset sintering end-point distance Ls, judge the current end-point distance deviation level K, When the end-point distance deviation level K ≤ 5%, decrease the stroke of the pressure plate in the current interval; if the stroke of the interval pressure plate reaches the lower limit, then increase the valve opening of the main exhaust fan, so that the maximum error area deviating from the preset sintering end-point tends to the target parameter; When the range of the end-point distance deviation level K is 5% < K ≤ 15%, increase the valve opening of the main exhaust fan, and synchronously monitor whether the pressure plate reaches the lower limit. If it does not reach the lower limit, synchronously decrease the stroke of the pressure plate in the current interval, and perform raw material moisture compensation.

2. The optimization control method for a stable sintering end point cross section according to claim 1, characterized in that: The obtaining of the sintering end-point distances of each interval of the current cross-section includes: Obtain the sintering cross-section images of each interval; Perform edge detection on the sintering cross-sectional image to determine the actual position coordinates of the sintering front X u ; Combine the mapping relationship between image pixels and actual physical dimensions to calculate the sintering endpoint distance a u : a u = X u * L u ， In the formula L u is the actual length corresponding to the unit pixel, Establish the above sintering end point distance La and sintering end point distance a u The spatial mapping relationship of the sintering end point distance is finally calculated a f : a f =ω*a i +(1-ω)*a u ， In the formula ω It is the reliability indicator of temperature data.

3. The optimization control method for a stable sintering end point cross section according to claim 2, characterized in that: It also includes: Obtain the height of each material layer of the sintering pallet cross-section, and judge whether the absolute value of the difference between the current height of each material layer and the height of the corresponding material layer at the target end position is less than the given threshold; When the absolute value of the height of the material layer and the height of the corresponding material layer at the target end position is less than the given threshold, keep the current set stroke value of the pressure plate unchanged; Otherwise, adjust the stroke of the pressure plate according to the stroke correspondence table.

4. The optimization control method for a stable sintering end point cross section according to claim 3, characterized in that: Obtain the target height of the interval material layer, including: According to the sintering end point distance L , Sintering trolley speed v , calculate the sintering time t , according to the vertical sintering speed V1 Multiply by the sintering time t , get the target height of the interval material layer; Vertical sintering speed V1 is the vertical sintering speed of the first two cycles V1 'and V1 The mean of ''.

5. The optimized control method for stabilizing the sintering end-point cross-section according to claim 4, characterized in that, When the height of the interval material layer is consistent with the target height, judge the current sintering end-point anomaly coefficient S: S = ΔD / ΔDs, where ΔD is the real-time distance deviation and ΔDs is the deviation set by the process requirements; When S ≥ 1.0, the sintering end-point is abnormal, Judge whether the air volume is within the process requirements range. When the air volume is within the process requirements range, perform air box opening adjustment, optimize the air volume distribution, and correct the sintering end-point; When the air volume is not within the process requirements range, adjust the main fan power, correct the air volume to the process range, and synchronously distribute the air box opening to correct the sintering end-point; When S < 1.0, the sintering end-point is normal, and maintain the current parameters.

6. The optimization control method for a stable sintering end point cross section according to claim 4, characterized in that: When the height of the interval material layer is inconsistent with the target height, judge the current sintering end-point anomaly coefficient S: When S ≥ 1.0, the sintering end-point is abnormal, Judge whether the stroke of the pressure plate in the current interval reaches the limit. When the stroke of the pressure plate does not reach the limit, adjust the stroke L of the pressure plate to correct the sintering end-point; When the stroke of the pressure plate reaches the limit, control the air volume to correct the sintering end-point; When the sintering end-point returns to normal, correct the height of the current interval material layer in combination with the stroke of the pressure plate and the air volume parameters; When S<1.0, the sintering endpoint is normal. Combine the pressure plate stroke and air volume parameters to correct the current material layer height.

7. The optimization control method for a stable sintering end point cross section according to claim 4, characterized in that: It also includes establishing the valve opening K of the main exhaust fan i The maximum value of valve opening K max A corresponding table of the absolute value of the difference and the adjustment amplitude value of the valve opening, wherein the absolute value is proportional to the adjustment amplitude value; The valve opening of the main exhaust fan is adjusted according to the opening correspondence table.

8. An optimization control system for a stable sintering end point cross section, characterized in that: include The cycle control unit triggers the first detection unit to detect the sintering end point distance of each section of the cross section and the second detection unit to detect the stroke of each pressing plate above the round roller feeder according to a fixed period. The first detection unit is used to detect the sintering end point distance of each interval of the current cross section; The second detection unit is used to detect the stroke of each pressing plate above the round roller feeder; The first judgment unit is used to judge whether the current sintering end point distance is less than the preset sintering end point distance; The second judgment unit is used to judge whether the current stroke of the pressing plate reaches the upper limit or the lower limit; The regulating unit obtains regulating data by comparing the judgment result, the opening correspondence table and the stroke correspondence table. The regulating data is used to adjust the valve opening and the pressing plate stroke of the main exhaust fan.

9. The optimization control system for stabilizing the sintering end point cross section according to claim 8, characterized in that: The regulating unit includes a first regulating module, a second regulating module, a third regulating module and a fourth regulating module. When the stroke of the pressing plate in the current interval does not reach the upper limit, the first regulating module increases the stroke of the pressing plate in the interval according to the stroke correspondence table, so that the interval deviates from the preset sintering end point and approaches Target distance; When the sintering end point distance of a part of the intervals on the current cross section is less than the preset sintering end point distance and the stroke of the pressing plate in the current interval has reached the upper limit, the second regulating module reduces the valve opening of the main exhaust fan according to the opening correspondence table so that the maximum error area deviating from the preset sintering end point approaches the target distance; When the sintering end point distance of a part of the interval on the current cross section is greater than the preset sintering end point distance and the current pressing plate stroke has not reached the lower limit, the third adjusting module reduces the stroke of the pressing plate in the interval according to the stroke correspondence table to reduce the feeding amount so that the interval deviates from the preset sintering end point and approaches the target distance; When the sintering endpoint distance of a partial interval on the current cross-section is greater than the preset sintering endpoint distance and the current pressing plate stroke has reached the lower limit, the fourth adjustment module increases the valve opening of the main exhaust fan according to the opening correspondence table so that the maximum error area deviating from the preset sintering endpoint approaches the target distance.

10. The optimization control system for stabilizing the sintering end point cross section according to claim 8, characterized in that: It also includes a third detection unit for detecting the height of each material layer in the cross section of the sintering trolley. A third judgment unit, the third judgment unit is used to judge whether the absolute value of the difference between the current height of each material layer and the height of the material layer corresponding to the target end position is less than a given threshold; When the absolute value is less than the given threshold, the currently set pressure plate stroke is kept unchanged; Otherwise, adjust the stroke of the press plate according to the stroke adjustment table.

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