Optimization Control Method and System for Stable Sintering End Point Cross Section

Abstract

The present invention relates to the technical field of sintering production process control, and discloses an optimized control method and system for stabilizing the sintering end cross-section, which acquires the sintering end 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 distances of some intervals are less than the preset sintering end distance, it is judged whether the stroke of the pressure plate in the current interval reaches the upper limit, and the consistency of the sintering end position and the end cross-section is adjusted by coordinately controlling the stroke of the pressure plate and the valve opening of the main exhaust fan, so that the sintering end is controlled at the target position, and the stroke of the pressure plate in each interval is controlled to change the thickness of the material layer, and the sintering time from top to bottom of the material layer is adjusted, which is a longitudinal adjustment method. Adjusting the valve opening of the main exhaust fan can change the end position state of the entire cross-section of the sintering pallet at the same time, which is a transverse adjustment method. Considering from two dimensions of longitudinal and transverse, the coordinated optimization adjustment of the sintering end target position and cross-section consistency 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 production, 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 the blast furnace be increased, but also the production cost can be effectively reduced, enhancing the market competitiveness of the enterprise.

[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 the blast furnace. 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:

[0006] An optimized control method for stabilizing the sintering end cross-section includes the steps of:

[0007] 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;

[0008] 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:

[0009] ,

[0010] 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 area with the maximum error deviating from the preset sintering end tends to the target parameter;

[0011] When the end - point distance deviation is 5% < K ≤ 15%, reduce the valve opening of the main induced - draft 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;

[0012] When the end - point distance deviation level K > 15%, it indicates that the sintering system is operating abnormally, and the optimization control method for the sintering end - point cross - section cannot be enabled. The system is regulated by the on - site sintering technicians.

[0013] 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.

[0014] When the end - point distance deviation level K ≤ 5%, reduce the stroke of the pressure plate in the current interval; if the stroke of the interval pressure plate reaches the lower limit, increase the valve opening of the main induced - draft fan so that the maximum error area deviating from the preset sintering end - point tends to the target parameter;

[0015] When the end - point distance deviation is 5% < K ≤ 15%, increase the valve opening of the main induced - draft 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 interval, and perform raw material moisture compensation, which is carried out during the primary mixing process of the raw materials.

[0016] When the end - point distance deviation level K > 15%, it indicates that the sintering system is operating abnormally, and the optimization control method for the sintering end - point cross - section cannot be enabled. The system is regulated by the on - site sintering technicians.

[0017] In the present invention, preferably, the obtaining of the sintering end - point distances of each interval of the current cross - section includes:

[0018] Obtain the sintering cross - section images of each interval;

[0019] Perform edge detection on the sintering cross - section images to determine the actual position coordinates of the sintering front edge X u ;

[0020] Combined with the mapping relationship between image pixels and actual physical dimensions, calculate the sintering end - point distance a u :

[0021] a u = X u * L u ,

[0022] In the formula L u is the actual length corresponding to a unit pixel.

[0023] 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 a f :

[0024] a f = ω * a i +(1 - ω) * a u ,

[0025] wherein ω is the credibility index of the temperature data.

[0026] In the present invention, preferably, it further includes:

[0027] Obtain the height of each material layer at the cross-section of the sintering pallet, and determine 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;

[0028] When the absolute value of the material layer height and the height of the corresponding material layer at the target end position is less than the given threshold, keep the current set travel value of the pressure plate unchanged;

[0029] Otherwise, adjust the travel of the pressure plate according to the travel correspondence table.

[0030] In the present invention, preferably, obtaining the target height of the interval material layer includes:

[0031] According to the sintering end point distance L (meters), the sintering pallet speed v (meters / minute), calculate the sintering time t (minutes), and according to the vertical sintering speed V1 (meters / minute) multiplied by the sintering time t (minutes) to obtain the target height of the interval material layer;

[0032] The vertical sintering speed V1 (meters / minute) is the average value of the vertical sintering speeds V1 ' and V1 '' of the previous two cycles.

[0033] In the present invention, preferably, when the interval material layer height is consistent with the target height, judge the current sintering end point abnormal coefficient S:

[0034] S = ΔD / ΔDs,

[0035] where ΔD is the real-time distance deviation and ΔDs is the process requirement set deviation;

[0036] When S≥1.0, the sintering end point is abnormal,

[0037] Judge whether the air volume is within the process requirement range. When the air volume is within the process requirement range, adjust the air box opening degree, optimize the air volume distribution, and correct the sintering end point;

[0038] 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 degree, and correct the sintering end point;

[0039] When S < 1.0, the sintering end point is normal, and the current parameters are maintained.

[0040] In the present invention, preferably, when the interval bed height is inconsistent with the target height, judge the abnormal coefficient S of the current sintering end point:

[0041] When S ≥ 1.0, the sintering end point is abnormal,

[0042] 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;

[0043] When the stroke of the pressure plate reaches the limit, control the air volume to correct the sintering end point;

[0044] When the sintering end point returns to normal, correct the interval bed height of the current interval in combination with the stroke of the pressure plate and the air volume parameter;

[0045] When S < 1.0, the sintering end point is normal,

[0046] Correct the current bed height in combination with the stroke of the pressure plate and the air volume parameter.

[0047] In the present invention, preferably, it further includes establishing the valve opening degree K of the main exhaust fan i and the maximum valve opening degree K max The corresponding table of the absolute value of the difference and the adjustment amplitude value of the valve opening degree, and the absolute value is proportional to the adjustment amplitude value;

[0048] Adjust the valve opening degree of the main exhaust fan according to the corresponding table of the opening degree.

[0049] An optimized control system for stabilizing the sintering end point section includes a cyclic 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,

[0050] The first detection unit is used to detect the sintering end point distance of each interval of the current cross section;

[0051] The second detection unit is used to detect the stroke of each pressure plate above the round roller feeder;

[0052] The first judgment unit is used to judge whether the current sintering end point distance is less than the preset sintering end point distance;

[0053] The second judgment unit is used to judge whether the current pressure plate stroke reaches the upper limit or the lower limit;

[0054] 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 induced draft fan and the pressure plate stroke.

[0055] 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 pressure plate stroke in the current interval does not reach the upper limit, the first adjustment module increases the pressure plate stroke 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;

[0056] When the sintering end point distance in the upper part of the current cross-section is less than the preset sintering end point distance and the pressure plate stroke in the current interval has reached the upper limit, the second adjustment module reduces the valve opening degree of the main induced draft 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;

[0057] When the sintering end point distance in the upper part of the current cross-section is greater than the preset sintering end point distance and the current pressure plate stroke does not reach the lower limit, the third adjustment module reduces the pressure plate stroke 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;

[0058] When the sintering end point distance in the upper part 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 degree of the main induced draft 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.

[0059] 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,

[0060] A third judgment unit, and the third judgment unit is used to judge whether the absolute value of the difference between the height of each current material layer and the height of the material layer corresponding to the target end position is less than a given threshold;

[0061] When the absolute value is less than the given threshold, keep the currently set pressure plate stroke unchanged;

[0062] Otherwise, adjust the pressure plate stroke according to the stroke adjustment table.

[0063] Compared with the prior art, the beneficial effects of the present invention are:

[0064] The method of the present invention adjusts the sintering end position and the consistency of the end cross-section by coordinately controlling two parameters, namely the stroke of the pressure plate and the opening degree of the valve of the main induced draft fan, so that the sintering end is controlled at the target position. Controlling the stroke of the pressure plate in each interval can change the thickness of the material layer, and then adjust the sintering time of the material layer from top to bottom, which is a longitudinal adjustment method for the end position. Adjusting the opening degree of the valve of the main induced draft fan can change the end position state of the entire cross-section of the sintering pallet at the same time, which is a transverse adjustment method for the end position. This control method comprehensively considers from the longitudinal and transverse dimensions of the sintering material, and realizes the coordinated and optimized adjustment of the target position of the sintering end and the cross-section consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a schematic structural diagram of a sintering system.

[0066] Figure 2 It is a schematic flow chart of an optimized control method for stabilizing the sintering end cross-section according to the present invention.

[0067] Figure 3 It is a schematic structural diagram of an optimized control system for stabilizing the sintering end cross-section according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0068] 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 of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0070] 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, pallet, ignition, sintering, crushing and screening, as shown in Figure 1As shown. 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 point, the temperature measuring devices inside the air box are more densely distributed in a matrix form to ensure precise temperature control. In addition, the 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 burden distribution; 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 damper opening 7 of the main exhaust fan is used for adjustment to control the vertical sintering speed of the mixed material on the trolley.

[0071] Combined with the current situation of the sintering material, the valve opening of the main exhaust fan and the stroke of the pressure plate are controlled in real time, so that the sintering end points of the sintering materials in each interval are maintained at the target distance, while taking into account good cross-sectional consistency, and improving the quality and output of the sintered ore.

[0072] Example 1, an optimization control method specifically includes the steps:

[0073] S1. 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.

[0074] The sintering end point distance refers to the distance between the sintering end point and the initial position where the sintering material starts to sinter. Usually, in order to ensure the quality of the sintered ore, different types of sintering materials have their own preset minimum sintering end point distances b min , but in the actual sintering production process, many sintering factors will affect the sintering speed, which will cause the actual sintering end point distance to not match the preset sintering end point distance Ls. Therefore, the purpose of this step is to calculate the sintering end point distances La of each interval of the current cross-section as the basis for subsequent control. The specific steps for calculating the sintering end point distances La of each interval of the current cross-section are to obtain the sintering cross-section images of each interval;

[0075] Perform edge detection on the sintering cross-section image to determine the actual position coordinates of the sintering front X u ;

[0076] Combine the mapping relationship between the image pixels and the actual physical dimensions to calculate the sintering end point distance a u :

[0077] a u = X u * Lu ,

[0078] In the formula L u is the actual length corresponding to a unit pixel.

[0079] Establish the spatial mapping relationship between the above sintering end point distance La and the sintering end point distance a u , and finally calculate the sintering end point distance La:

[0080] La = ω * a i +(1 - ω) * a u ,

[0081] In the formula ω is the credibility index of the temperature data.

[0082] By communicating with the PLC (Programmable Logic Controller) or DCS (Distributed Control System), the stroke data of each pressure plate above the round roller feeder can be obtained in real time Y i当前 .

[0083] S21. When the sintering end point distance La in some intervals is less than the preset sintering end point distance Ls, judge the current end point distance deviation level K:

[0084] ,

[0085] 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 exhaust fan and increase the feeding amount, so that the area with the largest error deviating from the preset sintering end point tends to the target parameter;

[0086] Under the condition of 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 interval H 料， Under the condition of keeping the existing vertical sintering speed in the interval V1 i (m / min), the vertical sintering time of the material layer will increase, so that the sintering end point of the current interval tends to the preset sintering end point b avr .

[0087] Usually, when the stroke of the pressure plate in a certain interval reaches the maximum value, it is no longer possible to improve the situation of the current sintering end point advancing by adjusting the material layer thickness. By means of reducing the valve opening of the main exhaust fan, the vertical sintering speed of each interval in the sintering cross-section can be reduced V1 i(m / min) to make the maximum error area deviating from the preset sintering end point tend to the target distance, improve the utilization efficiency of the air volume, and reduce the energy consumption; furthermore, in the next cycle, the distance of the sintering end point can continue to be adjusted 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.

[0088] 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.

[0089] When the end point distance deviation level K ≤ 5%, reduce the stroke of the current sectional pressure plate; if the stroke of the sectional pressure plate reaches the lower limit, increase the valve opening of the main exhaust fan to make the maximum error area deviating from the preset sintering end point tend to the target parameter.

[0090] 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 current sectional pressure plate and perform raw material moisture compensation.

[0091] When the stroke of the sectional pressure plate of a certain section reaches the minimum value, it is no longer possible to improve the current situation of the early sintering end point by adjusting the thickness of the material layer. By means of increasing the valve opening of the main exhaust fan and improving the air volume, the operating efficiency of the sintering machine production line can be improved as a whole, and the vertical sintering speed of each section of the sintering cross-section can be increased. V1 i (m / min) to make the maximum error area deviating from the preset sintering end point tend to the target distance; furthermore, in the next cycle, the distance of the sintering end point can continue to be adjusted 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.

[0092] Embodiment 2. This embodiment provides a method for adjusting the valve opening of the main exhaust fan, which specifically includes:

[0093] S201. Establish the valve opening K of the current main exhaust fan i and the maximum value K of the valve opening max The corresponding table of the absolute value of the difference and the adjustment amplitude value of the valve opening, and the absolute value is proportional to the adjustment amplitude value.

[0094] S202. Adjust the valve opening of the main exhaust fan according to the comparison table.

[0095] The adjustment in this step includes two operations: increasing and decreasing. To reduce the valve opening of the main exhaust fan in step S106 of Embodiment 1, the following method can be specifically referred to for adjustment:

[0096] When the valve opening of the main exhaust fan is reduced by 3 degrees every 60 seconds.

[0097] When occurs, the valve opening of the main exhaust fan decreases by 2 degrees every 60 seconds.

[0098] When occurs, the valve opening of the main exhaust fan decreases by 1 degree every 60 seconds.

[0099] To increase the valve opening of the main exhaust fan in step S109 of Embodiment 1, the adjustment can be specifically carried out with reference to the following method:

[0100] When occurs, the valve opening of the main exhaust fan increases by 1 degree every 60 seconds.

[0101] When occurs, the valve opening of the main exhaust fan increases by 2 degrees every 60 seconds.

[0102] When occurs, the valve opening of the main exhaust fan increases by 3 degrees every 60 seconds.

[0103] The above-mentioned increase or decrease in the valve opening of the main exhaust fan is only a specific implementation method. During the actual adjustment process, the adjustment amplitude value or adjustment basis can be set separately, and it is not limited to the above-set adjustment limit values.

[0104] In the method provided in Embodiment 2 of the present invention, a correspondence table between the absolute value of the difference between the valve opening of the main exhaust fan and the maximum valve opening value 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 value 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 value is, and when the adjustment amplitude value deviates from the maximum valve opening value, 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 value is, and when the adjustment amplitude value continuously approaches the maximum valve opening value, the adjustment amplitude value decreases from large to small to improve the adjustment efficiency; this adjustment method can specifically adjust the valve opening value of the main exhaust fan according to the current valve opening of the main exhaust fan, taking into account both the adjustment accuracy and the adjustment efficiency.

[0105] In Embodiment 3, this embodiment provides a method for 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 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 stroke value of the pressure plate is kept unchanged; otherwise, the stroke of the pressure plate is adjusted according to the stroke correspondence table.

[0106] Obtaining the target height of the interval material layer includes:

[0107] According to the sintering end distance L(m), the speed of the sintering pallet v (m / min), the sintering time is calculated t (min), according to the vertical sintering speed V1 (m / min) multiplied by the sintering time t (min), the target height of the interval material layer is obtained; the vertical sintering speed V1 (m / min) is the average value of the vertical sintering speeds of the previous two cycles V1 ’ and V1 ’’.

[0108] When the height of the interval material layer is consistent with the target height, judge the current abnormal coefficient S of the sintering end point:

[0109] S = ΔD / ΔDs,

[0110] where ΔD is the real-time distance deviation and ΔDs is the process requirement setting deviation;

[0111] When S≥1.0, the sintering end point is abnormal. Judge whether the air volume is within the process requirement range. When the air volume is within the process requirement range, adjust the damper opening to optimize the air volume distribution and correct the sintering end point;

[0112] 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 damper opening, and correct the sintering end point;

[0113] When S<1.0, the sintering end point is normal, and the current parameters are maintained.

[0114] When the height of the interval material layer is inconsistent with the target height, judge the current abnormal coefficient S of the sintering end point:

[0115] When S≥1.0, the sintering end point is abnormal,

[0116] Judge whether the stroke of the pressure plate in the current interval has reached the limit. When the stroke of the pressure plate has not reached the limit, adjust the stroke L of the pressure plate to correct the sintering end point;

[0117] When the stroke of the pressure plate reaches the limit, control the air volume to correct the sintering end point;

[0118] When the sintering end point returns to normal, correct the height of the current interval material layer in combination with the stroke and air volume parameters of the pressure plate;

[0119] When S<1.0, the sintering end point is normal,

[0120] Combine the stroke and air volume parameters of the pressure plate to correct the current material layer height.

[0121] Example 4. The specific method for adjusting the stroke of the pressure plate in each interval provided in this Example 4 includes:

[0122] S301. Establish the pressure plate stroke P of the current interval i and the maximum value P of the pressure plate stroke max to form a stroke correspondence table between the absolute value of the difference and the adjustment amplitude value of the pressure plate stroke, where the absolute value is proportional to the adjustment amplitude value.

[0123] S302. Adjust the stroke of the pressure plate in the interval according to the stroke correspondence table.

[0124] The adjustment in this step includes two operations: increasing and decreasing. To increase the stroke of the pressure plate in the interval, the following adjustment methods can be specifically referred to:

[0125] When , the stroke of the pressure plate in the interval increases by 0.5 cm every 30 seconds.

[0126] When , the stroke of the pressure plate in the interval increases by 1 cm every 30 seconds.

[0127] When , the stroke of the pressure plate in the interval increases by 1.5 cm every 30 seconds.

[0128] To decrease the stroke of the pressure plate in the interval, the following adjustment methods can be specifically referred to:

[0129] When , the stroke of the pressure plate in the interval decreases by 1.5 cm every 30 seconds.

[0130] When , the stroke of the pressure plate in the interval decreases by 1 cm every 30 seconds.

[0131] When , the stroke of the pressure plate in the interval decreases by 0.5 cm every 30 seconds.

[0132] The above methods of increasing or decreasing the stroke of the pressure plate 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 is not limited to the above-set adjustment limit values.

[0133] In the method provided in the fourth embodiment of the present invention, a correspondence table 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 is established. 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 targetedly 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.

[0134] 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.

[0135] 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 value point of the curve ( X i , Y i ), and the sintering end distance of each interval = X i * Bellow length (unit: m).

[0136] The second detection unit is communicatively connected to the PLC (Programmable Logic Controller) or DCS (Distributed Control System) on the sintering site and can obtain the stroke data of each pressure plate above the round roll feeder in real time;

[0137] The first judgment unit is used to judge whether the current sintering end distance is less than the preset sintering end distance;

[0138] The second judgment unit is used to judge whether the current pressure plate stroke reaches the upper limit or the lower limit;

[0139] 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 induced draft fan and the pressure plate stroke.

[0140] Specifically, the adjustment unit includes a first adjustment module, a second adjustment module, a third adjustment module and a fourth adjustment module. When the pressure plate stroke in the current interval does not reach the upper limit, the first adjustment module increases the pressure plate stroke 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. Usually, when other production control parameters remain unchanged, increasing the pressure plate stroke 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.

[0141] When the sintering end point distance in some intervals in the current cross-section is less than the preset sintering end point distance, and the pressure plate stroke in the current interval has reached the upper limit, the second adjustment module reduces the valve opening degree of the main induced draft 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 pressure plate stroke 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 induced draft fan, the vertical sintering speed in each interval 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 pressure plate stroke in the interval, so that the sintering end points in each interval tend to the preset sintering end point.

[0142] When the sintering end point distance in some intervals in the current cross-section is greater than the preset sintering end point distance, and the current pressure plate stroke has not reached the lower limit, the third adjustment module reduces the pressure plate stroke 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 pressure plate stroke 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.

[0143] When the sintering end point distance in a partial interval on 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.

[0144] In this embodiment, it further includes a third detection unit for detecting the height of each material layer on the cross-section of the sintering trolley.

[0145] A third judgment unit, which is used to judge whether the absolute value of the difference between the height of each current material layer and the height of the material layer corresponding to the target end position is less than a given threshold.

[0146] When the absolute value is less than the given threshold, keep the current set pressure plate stroke unchanged.

[0147] Otherwise, adjust the stroke of the pressure plate according to the stroke adjustment table.

[0148] In some other preferred embodiments of the present invention, a computer-readable storage medium is provided, storing a computer program, which when executed by a processor, causes the processor to execute the steps of the method as described in the above embodiments.

[0149] 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 essentially or the part that contributes to the prior art or 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 foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0150] The above description is a detailed description of the preferred and feasible embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit disclosed by the present invention should fall within the scope of the patent covered by the present invention.

Claims

1. An optimized control method for stabilizing the sintering end point 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 reduce 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%, reduce 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%, reduce 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 reduce the stroke of the pressure plate in the current interval, and perform raw material moisture compensation.

2. The optimized control method for stabilizing the sintering end point cross-section according to claim 1, 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.

3. An optimized control method for stabilizing the sintering end point cross-section according to claim 2, characterized in that, Obtain the target height of the interval material layer, including: According to the distance from the sintering end point L and the speed of the sintering pallet v , the sintering time t is calculated. According to the vertical sintering speed V1 multiplied by the sintering time t , the target height of the interval material layer is obtained; Vertical sintering speed V1 is the vertical sintering speed of the first two cycles V1 ’ and V1 the mean value of ’’.

4. According to an optimized control method for stabilizing the sintering end point cross-section as described in claim 3, 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 process requirement set deviation; When S ≥ 1.0, the sintering end point 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 point; When the air volume is not within the process requirement 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.

5. The optimized control method for stabilizing the sintering end point cross-section according to claim 3, 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 end point is normal, Correct the current material layer height in combination with the stroke of the pressure plate and the air volume parameters.

6. The optimized control method for stabilizing the sintering end-point cross-section according to claim 3, wherein It also includes establishing the valve opening degree K of the main exhaust fan i and the maximum valve opening degree K max The corresponding table of the absolute value of the difference and the opening degree of the adjustment range value of the valve opening degree, and the absolute value is proportional to the adjustment range value; Adjust the valve opening of the main exhaust fan according to the opening correspondence table.

7. An optimized control system for stabilizing the sintering end point cross-section, which is used to implement the optimized control method for stabilizing the sintering end point cross-section according to any one of claims 1-6, characterized in that, Including The loop control unit 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 roll 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 roll 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 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 pressure plate stroke.

8. An optimized control system for stabilizing the sintering end point cross-section according to claim 7, characterized in that, 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. 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 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 sintering end point distance of some intervals in the current cross-section is greater than the preset sintering end point distance and the current pressure plate stroke does not reach 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 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 pressure plate stroke has reached the lower limit, the fourth adjustment module increases 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.

9. An optimized control system for stabilizing the sintering end point cross-section, as claimed in claim 7, wherein, It also includes a third detection unit for detecting the height of each material layer of the sintering pallet cross-section. The third judgment unit is used to judge whether the absolute value of the difference between the height of the current 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, keep the current set pressure plate stroke unchanged. Otherwise, adjust the stroke of the pressure plate according to the stroke adjustment table.

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