Dynamic dust removal control method during rolling of hot rolling dust removal fan

Abstract

The invention discloses a dynamic dust removal control method during rolling of a hot rolling dust removal fan. The method comprises the following steps: establishing a first dust removal mode based on a single steel type, a second dust removal mode based on two factors of the steel type and the finish rolling temperature, a third dust removal mode based on two factors of the steel type and the target thickness, and a fourth dust removal mode based on three factors of the steel type, the finish rolling temperature and the target thickness; and the corresponding dust removal air volume is determined according to one of the four dust removal modes actually adapted to the dust removal device. According to the dynamic dust removal control method during rolling of the hot rolling dust removal fan, a real-time dynamic dust removal air volume determining and regulating method based on three factors including the steel grade, the target thickness and the target temperature is established from the reasons for generating and influencing the dust volume; the method for determining the corresponding dust removal air volume according to the steel type attribute and the rolling attribute of the current strip steel is formed, and adaptive regulation and control of the dust removal air volume of various strip steels under various rolling process requirements with the purpose of energy conservation and consumption reduction are achieved.

Description

Technical Field

[0001] The invention belongs to the field of automatic control of metallurgical steel rolling, and in particular relates to a dynamic dust removal control method of a hot rolling dust removal fan during rolling. Background Art

[0002] Baosteel 1880 hot rolling has silicon steel that is easy to generate dust, and other steel types with less dust, and there are many rolling varieties and alternating rolling. On the one hand, the finishing mill will produce a large amount of exhaust gas containing iron oxide and water vapor in the second half of the rolling, forming red smoke, which seriously affects the health of workers and the atmospheric environment around the factory, so the dust removal effect must be guaranteed. On the other hand, some varieties have very little dust during the rolling process, and the dust removal capacity is designed according to the most severe working conditions during the engineering design stage. At present, considering the life of the high-voltage cabinet contactor of the dust removal fan and the impact of long-term high-current starting on the motor and fan, it is not easy to frequently switch off, and the dust removal system is often operated at a constant speed, which wastes a lot of electricity. At the same time, it also greatly reduces the service life of the dust removal fan and motor.

[0003] For the dust removal control on the existing hot rolling production line, it is necessary to optimize the settings for energy saving and consumption reduction. The most important manifestation is to establish dust removal control with adjustable air volume. Most of the existing variable air volume dust removal adopts real-time feedback and variable air volume adjustment control measures based on the dust content of the actual working conditions on site. There are two problems with this type of control scheme: First, it is a shock to the industrial frequency motor that used to run at a constant speed, and a lot of attention needs to be paid to the frequency conversion part; second, the control process is complicated, and the feedback itself has a lag. In addition, the frequency conversion itself also takes time, which will cause a superimposed lag effect and will not achieve the preset effect.

[0004] The invention application with application number: CN2020106001427 discloses "a hot rolling dust reduction control system and control method", wherein the system includes: a first-level atomization dust removal module, a second-level atomization dust removal module, a third-level negative pressure dust suction module and a feedforward concentration detection module; the first-level atomization dust removal module is used to start dust removal when the rolling mill starts; the second-level atomization dust removal module is used to start dust removal when the feedforward concentration detection module detects that the dust concentration is greater than the preset standard concentration; the third-level negative pressure dust suction module is used to start dust removal after the second-level atomization dust removal module is working and the feedforward concentration detection module detects that the dust concentration is greater than the standard concentration.

[0005] The invention application with application number: CN 2020107840744 discloses "a rolling mill dust detection system and method", including an environmental dust detector, a rolling mill dust detector, an anemometer, a steel overrun detector, a detection controller, and a data processing workstation. The environmental dust detector is installed next to the control room of the steel rolling workshop to measure the dust concentration in the workshop environment; the rolling mill dust detector is installed on the operating side and the transmission side of the top of the last frame of the rolling mill, respectively, to measure the dust concentration in the rolling mill area; the anemometer is installed next to the dust detector on the operating side and the transmission side of the top of the last frame of the rolling mill, respectively, to measure the wind speed at the top of the rolling mill; the steel overrun detector is installed on the last frame of the rolling mill to detect the steel passing state of the last frame; the detection controller collects the signals sent by the environmental dust detector, the rolling mill dust detector, the anemometer, and the steel overrun detector, and converts them into corresponding data for transmission to the data processing workstation. Summary of the invention

[0006] The object of the present invention is to provide a method for determining the dust removal air volume based on the steel type, target thickness and final rolling target temperature.

[0007] In order to achieve the above technical objectives, the present invention provides a method for dynamic dust removal control of a hot rolling dust removal fan during rolling, and the technical solution thereof is as follows:

[0008] A method for dynamic dust removal control of a hot rolling dust removal fan during rolling.

[0009] Establish the first dust removal mode based on a single steel grade, the second dust removal mode based on two factors of steel grade and final rolling temperature, the third dust removal mode based on two factors of steel grade and target thickness, and the fourth dust removal mode based on three factors of steel grade, final rolling temperature and target thickness.

[0010] For the current piece of strip steel entering the finishing rolling area, the corresponding dust removal air volume is determined according to its actual adaptation to one of the above four dust removal modes.

[0011] Further,

[0012] When the corresponding dust removal air volume is determined according to the first dust removal mode, the corresponding dust removal air volume is determined according to the composition of the steel grade;

[0013] When determining the corresponding dust removal air volume according to the second dust removal mode, firstly, the preliminary air volume is determined according to the composition of the steel grade, and then the preliminary air volume is fine-tuned according to the final rolling temperature to form the final air volume;

[0014] When determining the corresponding dust removal air volume according to the third dust removal mode, firstly, the preliminary air volume is determined according to the composition of the steel grade, and then the preliminary air volume is fine-tuned according to the target thickness to form the final air volume determination;

[0015] When determining the corresponding dust removal air volume according to the fourth dust removal mode, the preliminary air volume is first determined according to the composition of the steel grade, and then fine-tuned according to the target thickness and the final rolling temperature to determine the final air volume.

[0016] Further,

[0017] When the corresponding dust removal air volume is determined according to the first dust removal mode, it is specifically determined according to the content of C, Ni, Cu, S, Si, Mn, Cr, and A1 in the steel grade components;

[0018] When determining the corresponding dust removal air volume according to the second dust removal mode, first determine the preliminary air volume according to the C, Ni, Cu, S, Si, Mn, Cr, and A1 contents in the steel grade components, and then make fine adjustments according to the final rolling temperature. When the air volume corresponding to the final rolling temperature is consistent with the preliminary air volume, the preliminary air volume is used as the final air volume; otherwise, the air volume corresponding to the final rolling temperature is used as the final air volume.

[0019] When determining the corresponding dust removal air volume according to the third dust removal mode, first determine the preliminary air volume according to the C, Ni, Cu, S, Si, Mn, Cr, and A1 contents in the steel grade components, and then make fine adjustments according to the target thickness. When the air volume corresponding to the target thickness is consistent with the preliminary air volume, the preliminary air volume is used as the final air volume, otherwise the air volume corresponding to the target thickness is used as the final air volume;

[0020] When determining the corresponding dust removal air volume according to the fourth dust removal mode, first determine the preliminary air volume according to the C, Ni, Cu, S, Si, Mn, Cr, and Al contents in the steel components, and then make fine adjustments according to the target thickness. When the air volume corresponding to the target thickness is consistent with the preliminary air volume, the preliminary air volume is used as the second air volume; otherwise, the air volume corresponding to the target thickness is used as the second air volume; finally, fine-tune the second air volume according to the finishing temperature. When the air volume corresponding to the finishing temperature is consistent with the second air volume, the second air volume is used as the final air volume; otherwise, the air volume corresponding to the finishing temperature is used as the final air volume.

[0021] Further,

[0022] The air volume is determined according to the content of C, Ni, Cu, S, Si, Mn, Cr, and Al in the steel grade components. Specifically, the steel grade components of the current strip are scored accordingly according to the following formula, and then the specific air volume is determined according to the score.

[0023] X=a1×C%+a2×Ni%+a3×Cu%+a4×S%+a5×Si%-a6×Mn%-a7×Cr%-a8×Al%,

[0024] In the formula,

[0025] X: score;

[0026] a1-a8: weight coefficient;

[0027] C%, Ni%, Cu%, S%, Si%, Mn%, Cr%, Al%: mass percentage of each component.

[0028] Further,

[0029] When determining the corresponding air volume according to the target thickness, first divide the target thickness levels according to the thickness value, then set the corresponding air volume according to the target thickness levels, and finally determine which target thickness level the target thickness of the current piece of strip corresponds to, thereby completing the determination of the air volume for the current piece of strip at the target thickness.

[0030] Further,

[0031] The target thickness levels are divided into:

[0032] The rolling thickness exceeding the maximum value of the set rolling thickness is the first level, and the rolling thickness less than the minimum value of the set rolling thickness is the last level. The set difference is used as the division interval from the first level to the last level to form the target thickness level.

[0033] Further,

[0034] When determining the corresponding air volume according to the final rolling temperature, first divide the corresponding target temperature levels according to the final rolling temperature values, then set the corresponding air volume according to the target temperature levels, and finally determine which target temperature level the final rolling temperature of the current piece of strip corresponds to, thereby completing the determination of the air volume for the current piece of strip at the final rolling temperature.

[0035] Further,

[0036] The target temperature levels are divided into:

[0037] The first level is when the final rolling target temperature exceeds the set maximum target temperature, and the last level is when the final rolling target temperature is less than the set minimum target temperature. The interval is divided from the first level to the last level according to the set difference to form a target temperature level.

[0038] Further,

[0039] The dynamic dust removal control method is implemented based on the original L2 and L1, or based on the newly established L2 and L1.

[0040] When the implementation is established based on the newly established L2 and L1, the newly established L2 obtains the strip information by establishing communication with the original L2.

[0041] Further,

[0042] The dust removal air volume is established according to a variable frequency system based on the actual air volume or according to a variable frequency system based on a gear system.

[0043] Further,

[0044] When the dust removal air volume is established according to the variable frequency based on the gear system, two air volume gear adjustment modes are formed, namely, the variable frequency gear that is compatible with the industrial frequency motor and the variable frequency gear that is not compatible with the industrial frequency motor.

[0045] Further,

[0046] First, a procedure table for program indexing is established based on historical rolling data; then, the strip information is indexed based on the procedure table to determine the current strip information; finally, the corresponding air volume is determined based on the determined information.

[0047] Further,

[0048] The schedule is established in CSV format, forming a sequence of steel types, target thickness and final rolling temperature in the schedule.

[0049] The indexing completes the indexing and confirmation of the current piece of strip steel information by first indexing the steel type, then indexing the target thickness within the range constrained by the indexing result, and then indexing the final rolling temperature within the range constrained by the target thickness.

[0050] Further,

[0051] The steel grade information is established in a two-level progressive manner by first classifying large steel grades and then classifying small steel grades.

[0052] Further,

[0053] A strip steel information indexing module and a dust removal air volume determination module are established in L2. When the indexing and confirmation are completed in the strip steel information indexing module according to the current strip steel information, the dust removal air volume determination module is entered to determine the specific air volume; otherwise, an alarm is issued, and the manual adjustment and setting of the dust removal air volume of the current strip steel is completed manually.

[0054] The present invention provides a method for dynamic dust removal control during rolling of a hot rolling dust removal fan. Starting from the causes of generating and influencing the amount of dust, a real-time dynamic dust removal air volume determination and regulation method based on three factors: steel grade, target thickness and final rolling target temperature is established. A method for determining the corresponding dust removal air volume according to the steel grade properties and rolling properties of the current strip is formed, so as to achieve adaptive regulation of the dust removal air volume of various strips under various rolling process requirements for the purpose of energy saving and consumption reduction, and the frequency conversion control used to adjust the air volume takes into account the compatibility with industrial frequency motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1It is a schematic diagram of the control execution process of the present invention;

[0056] Figure 2 It is a schematic diagram of the hot rolling production line in the present invention. DETAILED DESCRIPTION

[0057] Below, a method for dynamic dust removal control during rolling of a hot rolling dust removal fan of the present invention is further described in detail according to the accompanying drawings and specific implementation methods of the specification.

[0058] In order to form a preliminary understanding of the overall technical solution, the following is a brief introduction to the setting ideas and implementation process of this technical solution:

[0059] If you want to establish the regulation of dust removal air volume on the hot rolling production line, you must first find the basis for air volume regulation. This basis obviously points to the amount of dust, and the way to obtain the amount of dust can be obtained through actual on-site detection, and there are some technical solutions in the prior art that are done in this way, but the shortcomings of this regulation method are briefly described in the background technology part, and how to find a solution that is different from the actual on-site detection to obtain the amount of dust. This technical solution starts from the perspective of the causes and influencing factors of dust generation, and establishes a real-time dynamic dust removal air volume determination and regulation method based on three factors: steel grade, target thickness and final rolling target temperature; a method for determining the corresponding dust removal air volume according to the steel grade properties and rolling properties of the current strip is formed.

[0060] Dust is iron oxide scale, so the generation of dust is related to the surface oxidation ability. Through observation, analysis and summary, it is found that: 1. The increase in the content of carbon, silicon, nickel, copper and sulfur in the steel components will increase the generation of iron oxide scale, while manganese, chromium and aluminum in the components will inhibit the generation of iron oxide scale; 2. The oxidation rate increases with the increase of temperature; 3. The rolling speed is naturally different for different thicknesses, and the thinner the rolling speed, the faster the metal flow rate, and the more iron oxide scale is generated. That is, the amount of iron oxide scale generated is related to the composition, rolling speed (that is, thickness) and temperature; this serves as the theoretical support for the establishment of this technical solution.

[0061] The implementation and production of the above technical ideas will involve the following two aspects: 1. Determination of the specific air volume; 2. How to convert it into a part for program execution and information exchange. The following will explain the two aspects separately.

[0062] Determination of specific air volume:

[0063] The basic process is: first determine the corresponding air volume according to the steel grade composition, target temperature and target thickness, and then adjust the corresponding air volume according to the specific air volume. Here, from determining the corresponding air volume according to the steel grade composition, target temperature and target thickness to adjusting the corresponding air volume according to the specific air volume, different determination schemes will be formed according to the actual situation and the situation of the on-site motor:

[0064] 1. Determine the corresponding air volume according to the steel grade composition, target temperature and target thickness, and then directly set and adjust the specific air volume based on this air volume, that is, establish the dust removal air volume according to the frequency conversion system based on the actual air volume mentioned above.

[0065] 2. First, set the air volume level, and then determine the corresponding air volume according to the steel grade composition, target temperature and target thickness. According to which level the determined air volume belongs, determine the level of the corresponding air volume, that is, establish the dust removal air volume according to the variable frequency based on the level system mentioned above.

[0066] When the first air volume is determined and executed, the motor adapted at this time is a variable frequency motor; when the second air volume is determined and executed, the specific number of gears can be set according to the specific motor input situation. When considering the compatibility with the industrial frequency motor, the corresponding number of gears is set within the tolerance of the industrial frequency motor. When the industrial frequency motor is not considered, the corresponding number of gears can be determined based on expert experience.

[0067] When determining the corresponding air volume according to the steel grade composition, target temperature and target thickness, it is determined according to the current strip rolling process requirements. For strip steel with no additional requirements for rolling properties, the dust removal air volume is determined based on the individual strip steel grade to form the first dust removal mode; for strip steel with additional requirements for rolling properties, according to the requirements of specific rolling properties, the second dust removal mode based on the two factors of steel grade and final rolling temperature, the third dust removal mode based on the two factors of steel grade and target thickness, and the fourth dust removal mode based on the three factors of steel grade, final rolling temperature and target thickness can be formed. Which one is suitable is determined according to the rolling properties of the current strip steel.

[0068] In order to form a full understanding of this part, the following is a specific explanation of the process of determining the dust removal air volume by establishing a dust removal air volume mode based on a gear-based variable frequency system and with all influencing factors (i.e., the fourth dust removal mode). As for the determination process of other dust removal modes, as well as the establishment of dust removal air volume in all dust removal modes based on the variable frequency system of actual air volume, you can refer to this process for corresponding technical analogies and processing.

[0069] The process of determining the dust removal air volume of the fourth dust removal mode in the dust removal air volume mode based on the variable frequency of the gear system:

[0070] First, the preliminary air volume is determined according to the C, Ni, Cu, S, Si, Mn, Cr, and Al contents in the steel grade components, and then fine-tuned according to the target thickness. When the air volume corresponding to the target thickness is consistent with the preliminary air volume, the preliminary air volume is used as the second air volume, otherwise the air volume corresponding to the target thickness is used as the second air volume; finally, the second air volume is fine-tuned according to the final rolling temperature. When the air volume corresponding to the final rolling temperature is consistent with the second air volume, the second air volume is used as the final air volume; otherwise, the air volume corresponding to the final rolling temperature is used as the final air volume. When the final air volume is determined, see which gear the air volume belongs to, and then set the gear of the corresponding air volume according to the gear.

[0071] Among them, when the air volume is determined according to the C, Ni, Cu, S, Si, Mn, Cr, and Al contents in the steel components, the specific steps are as follows: first, the steel components of the current strip are scored accordingly according to the following formula, and then the specific air volume is determined according to the scores. The determination of the specific air volume according to the scores is completed according to the expert scoring method.

[0072] X=a1×C%+a2×Ni%+a3×Cu%+a4×S%+a5×Si%-a6×Mn%-a7×Cr%-a8×Al%,

[0073] In the formula, X: fraction; a1-a8: weight coefficient; C%, Ni%, Cu%, S%, Si%, Mn%, Cr%, Al%: mass percentage of each component. It should be noted that C, Ni, Cu, S, Si, Mn, Cr, Al listed here are only taken into consideration, but not every steel grade has all the components. The specific components involved in the calculation are determined according to the specific steel grade; for example, silicon steel contains Si, while other steels do not contain silicon, so the corresponding a5 weight coefficient is assigned 0, and so on.

[0074] When determining the corresponding air volume according to the target thickness, first divide the target thickness level according to the thickness value, then set the corresponding air volume according to the target thickness level, and finally determine which target thickness level the target thickness of the current strip corresponds to, thereby completing the determination of the air volume of the current strip under the target thickness. Specifically:

[0075] The rolling thickness exceeding the maximum value of the set rolling thickness is the first level, and the rolling thickness less than the minimum value of the set rolling thickness is the last level. The interval is divided from the first level to the last level according to the set difference, forming a target thickness level. The setting of the maximum value of the set rolling thickness and the minimum value of the set rolling thickness mentioned here refers to the range of 1.2mm-12mm commonly used in the process; preferably, the specific maximum value can be determined in combination with the dust change, wherein the maximum value of the set rolling thickness is determined by taking a value within the range of 5mm-8mm, and the minimum value of the set rolling thickness is determined by taking a value within the range of 1.4-1.7mm; and the set difference is determined by taking any value within the interval of 1mm-2mm.

[0076] When determining the corresponding air volume according to the final rolling temperature, first divide the corresponding target temperature levels according to the final rolling temperature value, then set the corresponding air volume according to the target temperature level, and finally determine which target temperature level the final rolling temperature of the current strip corresponds to, thereby completing the determination of the air volume of the current strip at the final rolling temperature. Specifically:

[0077] The first level is when the final rolling target temperature exceeds the set maximum target temperature, and the last level is when the final rolling target temperature is less than the set minimum target temperature. The intervals are divided from the first level to the last level according to the set difference, forming a target temperature level. The setting of the target temperature maximum mentioned here refers to the range of 840-920°C commonly used in the process; preferably, the specific maximum value can be determined in combination with the dust change, wherein the determination of the setting target temperature maximum value is completed by taking a value within the range of 850-860°C, the setting target temperature minimum value is determined by taking a value within the range of 880-890°C, and the setting difference is determined by taking any value within the range of 25-35°C.

[0078] How to convert it into the part that can be used for program execution and information interaction:

[0079] The following technical processing and settings are involved here: 1. How to establish a control system; 2. How to quickly confirm the strip information and determine the corresponding dust removal air volume based on the confirmed strip information; 3. How to properly establish the frequency conversion time.

[0080] Regarding the problem of how to establish a control system, this technical solution can be implemented based on the original L2 and L1, or based on the newly established L2 and L1. When it is implemented based on the newly established L2 and L1, the newly established L2 obtains the strip steel information by establishing communication with the original L2. The determination of the specific air volume mentioned above is carried out based on the trigger signal that L2 receives the current strip steel information.

[0081] In order to solve the problem of how to properly establish the frequency conversion moment, this technical solution takes into account the factor that the frequency conversion needs a transition time to change from the current frequency to the target frequency to form the adaptation of the target air volume, so a solution is established that uses the flying shear signal as the frequency conversion trigger signal. The corresponding trigger signal position can also be specifically set in combination with the actual frequency conversion speed, that is, the moment of determining the frequency conversion trigger signal is set according to the specific frequency conversion speed, and reaching the flying shear position is just a solution determined according to this setting guiding principle.

[0082] The following focuses on how to quickly confirm the strip information and determine the corresponding dust removal air volume based on the confirmed strip information:

[0083] The corresponding technical settings for completing the processing of this problem can be conceptually summarized as being completed through the strip steel information indexing module and the dust removal air volume determination module set in L2, setting a procedure table in the strip steel information indexing module, and the determination of the specific air volume mentioned above is completed in the dust removal air volume determination module. The basic execution steps are: when the indexing and confirmation are completed in the strip steel information indexing module according to the current strip steel information, the dust removal air volume determination module is entered to determine the specific air volume; otherwise, an alarm is issued, and the manual adjustment setting of the dust removal air volume of the current strip steel is completed manually, see Figure 1 This means that a DI node is set in L1.

[0084] The establishment of the procedure index refers to the tree search concept, specifically, the indexing and confirmation of the current strip steel information is completed by first indexing the steel type, then indexing the target thickness within the range of the index result constraint, and then indexing the final rolling temperature within the range of the target thickness constraint. In order to further improve the efficiency of indexing, a two-level progressive classification is further established under the steel type entry, first classifying the large steel type, and then classifying the small steel type, so as to facilitate the indexing and determination of the large steel type first, and then indexing the progressive indexing of the small steel type within the determined range. The establishment of the specific procedure table is on the one hand to adapt to the determination process of the specific air volume determination part mentioned above, and on the other hand to form a statistical record of the existing steel types and rolling processes. Therefore, the procedure table is finally established according to the order of steel type, target thickness and final rolling temperature, and is completed according to the historical rolling data. When the indexing and confirmation are not successfully completed according to the index of the procedure table, an alarm is issued, which means that new data that is not entered in the procedure table is generated. After the corresponding processing is performed according to the alarm, the corresponding data of this alarm needs to be supplemented into the procedure table for subsequent processing. At the same time, in order to facilitate the handling of this matter, the procedure table is created in CSV format to take into account the switching to Excel, data changes and program execution.

[0085] In order to form a more intuitive understanding of the above explanation, it is explained below in the form of specific implementation steps. The control used in the following is implemented based on the newly established L2 and L1 (i.e., IHTL1 mentioned below). The newly established L2 (i.e., IHTL2 mentioned below) obtains the strip information by establishing communication with the original L2; the specific steps such as using the flying shear signal as the trigger signal, as well as the upper and lower limits of the target thickness and target temperature and the layer division difference are all for the purpose of illustrative statements, and are set within the scope of the above explanation. This setting is not a sole limitation.

[0086] 1.1. Material tracking strip position:

[0087] This technical solution adopts the method of corresponding material information to the strip position and multiple excitations to ensure the accuracy of the material position and material information. The specific method is as follows: the material tracking program sends the steel coil information telegram to excite the dust removal system interface service program when HSB, R1 ON, CS ON, and F1 ON to establish the strip object. Figure 2 The process diagram of the hot rolling production line is shown.

[0088] When the L2 (process control) system (dust removal service system) receives the telegram sent by the server at different locations, it generates the strip tracking status (TRACK STATUS event) and performs corresponding processing.

[0089] TRACK STATUS event definition:

[0090]

[0091] 1.2. Flying shear position signal

[0092] After the strip reaches the flying shear (CS ON), L2 sends the strip data to IHT L2 (dust removal service system).

[0093] 1.3. Establishment of dust removal procedure index;

[0094] 1.3.1、Establishment of multi-dimensional classification procedures table:

[0095] This technical solution combines the characteristics of the production site, that is, it is necessary to efficiently output the dust removal mode of the current product. For this reason, the procedure table involved in this technology needs to be efficient and accurate. For this reason, this technical solution adopts a multi-dimensional classification method to ensure the accuracy of the dust removal mode;

[0096] The specific classification methods involved are as follows: classification is carried out according to the hot-rolled steel type, and then major and minor classifications are carried out according to the steel tapping mark, and then multi-dimensional classification is carried out according to the thickness and temperature of the strip steel through grade classification, so as to achieve the purpose of efficient indexing;

[0097] For example, a production line is divided into five categories based on hot-rolled steel grades, including carbon steel, alloy steel, hot-rolled high-strength steel, cold-rolled high-strength steel, and pipeline steel. Each category is further divided into about 10 subcategories. Special products (silicon steel is divided into medium and low grades and high grades, non-oriented and oriented silicon steel, etc.) are classified. Then, for the subcategories under each major category, a special steel subcategory is added, which directly divides one or several steel-out marks into subcategories, which are special steel subcategories under the major category.

[0098] Combined with on-site use, a production line has more than 500 steel tapping marks and more than 930 specifications. After adopting this technology, the dust removal procedure table index is divided into 7 design thickness layers and 3 temperature layers, realizing a complete dust removal procedure table with more than 20,000 layer records. The following is an example of index classification:

[0099] The details are as follows:

[0100] SFC: Steel classification (SFCO1+SFC02)

[0101] SFC01: Classification of steel tapping marks

[0102] SFC02: Small classification of steel tapping marks

[0103] ThickClass: target thickness level

[0104] TempClass: target temperature class

[0105] ·Target thickness CH classification:

[0106] Layer number Layer differentiation 1 CH<1.5 2 1.5<=CH<2.0 3 2.0<=CH<3.0 4 3.0<=CH<4.0 5 4.0<=CH<5.0 6 5.0<=CH<6.0 7 CH>=6.0

[0107] Target temperature FT classification:

[0108] Layer number Layer differentiation 1 FT<850 2 850<=FT<880 3 FT>=880

[0109] 1.3.2. When the dust removal system (module) receives the strip steel data, it determines the reading procedure strategy according to the strip steel type classification, strip steel thickness grade and temperature grade. At the same time, it sets the dust removal motor power opening Power Mode (X0~X4) to L1 (basic automation) to achieve the purpose of differential control of dust removal air volume. No dust removal setting is performed on the virtual strip steel.

[0110] The following table shows the strip data content sent by L2 to IHT L2 (dust removal service system):

[0111]

[0112] Note: After receiving the strip data, L2 (dust removal service system) establishes the index information of the strip according to the steel type classification (family), target thickness (aimThick) and final rolling target temperature (aimFmTemp). Then, the air volume and the corresponding motor opening are determined according to the index result. If the index and confirmation are not completed, an alarm is issued and the air volume is determined manually.

[0113] 1.4. Procedure data control

[0114] 1.4.1. Establishment of procedure document structure

[0115]

[0116] Combined with the dust removal procedure level, the power opening of the dust removal motor can be divided into multiple gears according to the model. Taking 5 gears (0 to 4) as an example, the corresponding dust collector is given four air volume settings of 0%, 30%, 50%, 80%, and 100%. At the same time, the setting value is adjustable on the dust collector HMI.

[0117] 1.4.2、Establishment of layer data search sequence:

[0118] Due to the huge amount of data, it is impossible to index every product specification of all steel types. Therefore, the establishment of a specific procedure table and the corresponding specific indexing method are completed according to the tree search idea. The specific index adopts the priority indexing method. The following is the specific implementation of the priority indexing method adopted by this technical solution:

[0119]

[0120] In the table, 1 represents data and 0 represents default. For example, the index information of the production steel coil is: SFC01=9; SFC02=3; ThickClass=3; TempClass=3. SFC01 is indexed first, SFC01=9 is found in the database and SFC02 is indexed therein; after 3 is found in SFC02, ThickClass is searched in SFC02=3, and if 3 is not found, ThickClass is searched in the default value 0; and so on.

[0121] Assume that the data in the database is:

[0122]

[0123] The information indexed by the steel coil is SFC01=9; SFC02=0; ThickClass=3; TempClass=0; and the output mode MODE=3.

[0124] 1.4.3. Determine the frequency of the dust removal fan

[0125] Multiple gears and corresponding fan frequencies are preset in the L2 dust removal service system. The fan frequency set by the L2 dust removal service system according to the gear of the indexed motor power opening is transmitted to the L1 dust removal execution system. The air volume corresponding to the production conditions can be set to multiple gears and adjusted according to the actual situation during operation. Taking the production line involved in this technical solution as an example, 5 gears are set.

[0126] The corresponding relationship between specific production conditions and set air volume is as follows:

[0127] Setting mode 0 1 2 3 4 Predetermined air volume 0％ 30％ 50％ 80％ 100％ Fan frequency OHZ 20HZ 30HZ 40HZ 50HZ

[0128] 1.4.4 Data Archiving

[0129] When the steel coil is produced, IHT L1 will send the actual dust removal results back to the IHT L2 system in real time. After receiving the actual dust removal results, the strip data temporarily stored in the BIHT L2 system will be transferred to the database for persistence for later query.

[0130] The database tables include:

[0131] coil_dust_info strip steel basic data table (primary key: strip steel number)

[0132] coil_dust_actual Strip steel dust removal performance data table (primary key: strip steel number)

[0133] 1.4 Feedback value output

[0134] Combined with 1.3 indexing the current strip information, output the current dust removal mode;

[0135] 1.5. Send dust removal fan control:

[0136] A plurality of gears and corresponding fan frequencies are preset in the IHT L2 dust removal service system, and the fan frequency set by the IHT L2 dust removal service system according to the gear of the indexed motor power opening is transmitted to the IHT L1 dust removal execution system.

[0137] 1.6. Dust removal execution:

[0138] The L1 dust removal execution system executes according to the fan frequency set by the L2 dust removal service system according to the indexed motor power opening gear.

Claims

1. A method for dynamic dust removal control of a hot rolling dust removal fan during rolling, characterized in that: Establish the first dust removal mode based on a single steel grade, the second dust removal mode based on two factors of steel grade and final rolling temperature, the third dust removal mode based on two factors of steel grade and target thickness, and the fourth dust removal mode based on three factors of steel grade, final rolling temperature and target thickness. For the current piece of strip steel entering the finishing rolling area, the corresponding dust removal air volume is determined according to its actual adaptation to one of the above four dust removal modes.

2. The method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 1, characterized in that: When the corresponding dust removal air volume is determined according to the first dust removal mode, the corresponding dust removal air volume is determined according to the composition of the steel grade; When determining the corresponding dust removal air volume according to the second dust removal mode, firstly, the preliminary air volume is determined according to the composition of the steel grade, and then the preliminary air volume is fine-tuned according to the final rolling temperature to form the final air volume; When determining the corresponding dust removal air volume according to the third dust removal mode, firstly, the preliminary air volume is determined according to the composition of the steel grade, and then the preliminary air volume is fine-tuned according to the target thickness to form the final air volume determination; When determining the corresponding dust removal air volume according to the fourth dust removal mode, the preliminary air volume is first determined according to the composition of the steel grade, and then fine-tuned according to the target thickness and the final rolling temperature to determine the final air volume.

3. The method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 2, characterized in that: When the corresponding dust removal air volume is determined according to the first dust removal mode, it is specifically determined according to the C, Ni, Cu, S, Si, Mn, Cr, and Al contents in the steel grade components; When determining the corresponding dust removal air volume according to the second dust removal mode, first determine the preliminary air volume according to the C, Ni, Cu, S, Si, Mn, Cr, and Al contents in the steel grade components, and then make fine adjustments according to the final rolling temperature. When the air volume corresponding to the final rolling temperature is consistent with the preliminary air volume, the preliminary air volume is used as the final air volume; otherwise, the air volume corresponding to the final rolling temperature is used as the final air volume. When determining the corresponding dust removal air volume according to the third dust removal mode, first determine the preliminary air volume according to the C, Ni, Cu, S, Si, Mn, Cr, and Al contents in the steel grade components, and then make fine adjustments according to the target thickness. When the air volume corresponding to the target thickness is consistent with the preliminary air volume, the preliminary air volume is used as the final air volume, otherwise the air volume corresponding to the target thickness is used as the final air volume; When determining the corresponding dust removal air volume according to the fourth dust removal mode, first determine the preliminary air volume according to the C, Ni, Cu, S, Si, Mn, Cr, and Al contents in the steel grade components, and then make fine adjustments according to the target thickness. When the air volume corresponding to the target thickness is consistent with the preliminary air volume, the preliminary air volume is used as the second air volume, otherwise the air volume corresponding to the target thickness is used as the second air volume; finally, make fine adjustments to the second air volume according to the final rolling temperature. When the air volume corresponding to the final rolling temperature is consistent with the second air volume, the second air volume is used as the final air volume; Otherwise, the air volume corresponding to the final rolling temperature is used as the final air volume.

4. The method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 3, characterized in that: The air volume is determined according to the content of C, Ni, Cu, S, Si, Mn, Cr, and Al in the steel grade components. Specifically, the steel grade components of the current strip are scored accordingly according to the following formula, and then the specific air volume is determined according to the score. X=a1×C%+a2×Ni%+a3×Cu%+a4×S%+a5×Si%-a6×Mn%-a7×Cr%-a8×Al%, In the formula, X: score; a1-a8: weight coefficient; C%, Ni%, Cu%, S%, Si%, Mn%, Cr%, Al%: mass percentage of each component.

5. The method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 3, characterized in that: When determining the corresponding air volume according to the target thickness, first divide the target thickness levels according to the thickness value, then set the corresponding air volume according to the target thickness levels, and finally determine which target thickness level the target thickness of the current piece of strip corresponds to, thereby completing the determination of the air volume for the current piece of strip at the target thickness.

6. A method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 5, characterized in that: The target thickness levels are divided into: The rolling thickness exceeding the maximum value of the set rolling thickness is the first level, and the rolling thickness less than the minimum value of the set rolling thickness is the last level. The set difference is used as the division interval from the first level to the last level to form the target thickness level.

7. The method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 3, characterized in that: When determining the corresponding air volume according to the final rolling temperature, first divide the corresponding target temperature levels according to the final rolling temperature values, then set the corresponding air volume according to the target temperature levels, and finally determine which target temperature level the final rolling temperature of the current piece of strip corresponds to, thereby completing the determination of the air volume for the current piece of strip at the final rolling temperature.

8. The method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 7, characterized in that: The target temperature levels are divided into: The first level is when the final rolling target temperature exceeds the set maximum target temperature, and the last level is when the final rolling target temperature is less than the set minimum target temperature. The interval is divided from the first level to the last level according to the set difference to form a target temperature level.

9. The method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 1, characterized in that: The dynamic dust removal control method is implemented based on the original L2 and L1, or based on the newly established L2 and L1. When the implementation is established based on the newly established L2 and L1, the newly established L2 obtains the strip information by establishing communication with the original L2.

10. The method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 1, characterized in that: The dust removal air volume is established according to a variable frequency system based on the actual air volume or according to a variable frequency system based on a gear system.

11. A method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 10, characterized in that: When the dust removal air volume is established according to the variable frequency based on the gear system, two air volume gear adjustment modes are formed, namely, the variable frequency gear that is compatible with the industrial frequency motor and the variable frequency gear that is not compatible with the industrial frequency motor.

12. The method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 1, characterized in that: First, a procedure table for program indexing is established based on historical rolling data; then, the strip information is indexed based on the procedure table to determine the current strip information; finally, the corresponding air volume is determined based on the determined information.

13. A method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 12, characterized in that: The schedule is established in CSV format, forming a sequence of steel types, target thickness and final rolling temperature in the schedule. The indexing completes the indexing and confirmation of the current piece of strip steel information by first indexing the steel type, then indexing the target thickness within the range constrained by the indexing result, and then indexing the final rolling temperature within the range constrained by the target thickness.

14. A method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 13, characterized in that: The steel grade information is established in a two-level progressive manner by first classifying large steel grades and then classifying small steel grades.

15. The method for dynamic dust removal control of a hot rolling dust removal fan during rolling according to claim 13, characterized in that: A strip steel information indexing module and a dust removal air volume determination module are established in L2. When the indexing and confirmation are completed in the strip steel information indexing module according to the current strip steel information, the dust removal air volume determination module is entered to determine the specific air volume; otherwise, an alarm is issued, and the manual adjustment and setting of the dust removal air volume of the current strip steel is completed manually.

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