A method for controlling the opening of a blast furnace material flow valve by weight

Abstract

The present invention provides a method for controlling the weight-based opening of a blast furnace material flow valve, which relates to the technical field of blast furnace charging control. The method comprises: obtaining an actual weighing value; judging the type of the material tank, and obtaining a reference weight value and a correction ratio calculation parameter setting value corresponding to the type of the invention material tank; the correction ratio calculation parameter setting value of the invention includes the deviation weight value of the material tank type and the corresponding correction angle value; determining the reference opening of the material flow valve based on the invention reference weight value; calculating the correction ratio using the correction ratio calculation formula based on the correction ratio, the reference weight value and the actual weighing value; and controlling the material flow valve according to the calculated invention material flow valve execution angle output according to the type of the material tank and the charging conditions. The present invention avoids using the same material flow valve opening for each charging, stabilizes the number of blast furnace charging turns, and improves the effect of blast furnace spiral charging.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace material distribution control, and in particular to a method for controlling the weight-based opening of a blast furnace material flow valve. Background Art

[0002] The bell-less and tank-type blast furnace is a type of blast furnace commonly used in iron and steel plants. The two tanks on the top of the furnace are loaded alternately, and a charging system of one coke and one ore is implemented.

[0003] The material flow valve is the only means to adjust and control the flow rate, discharge speed and discharge time of the charge through the central throat. It plays a role in controlling and maintaining the uniform and reasonable distribution of the charge in the material tank to the furnace. During blast furnace production, the opening angle of the material flow valve is determined according to the type and weight of the material in the material tank and the number of distribution circles, so as to ensure that the number of distribution circles is stable within a certain range. According to the requirements, the number of distribution circles for ore at this stage is 12 circles; the number of distribution circles for coke is 15 circles.

[0004] At present, the size of the material flow valve opening is directly set by the loading operator according to the type and weight of the material, and then automatically called in a cycle through the program. However, from the perspective of the process of loading materials under the trough, there is a deviation between the set value of the material list and the actual weighing value during the weighing process, so it is necessary to correct the weighing, but the last deviation can only be corrected in the next weighing. For example, the weighing material list sets 42t of ore, and if the actual weighing loaded into the material tank is only 41t, then when weighing the ore in the next cycle, it is necessary to correct the deviation weight from the previous week on the weighing set value, that is, the weight to be weighed is: weighing set value + deviation correction value (42+1=43t). Therefore, the weight of the same type of material loaded into the material tank deviates greatly from the reference value, and the weight value of the material entering the material tank is different each time, which results in the use of the same material flow valve opening for each feeding, which is easy to cause large fluctuations in the number of feeding turns, resulting in more or less feeding turns in some gears during feeding, resulting in uneven and uneven material feeding into the furnace, thereby affecting the air permeability and flatness of the blast furnace material surface. Summary of the invention

[0005] In order to solve the technical problem of how to automatically adjust the opening of the material flow valve to ensure a certain number of distribution turns for the same type of materials with different weighing weights, the present invention provides a weight-based opening control method for a blast furnace material flow valve, which mainly corrects the set value of the material flow valve opening according to the type and weight of the material in the material tank, thereby ensuring a certain number of distribution turns.

[0006] To this end, the present invention provides the following technical solutions:

[0007] The present invention provides a method for controlling the weight-based opening of a blast furnace material flow valve, the method comprising:

[0008] Get the actual weighing value;

[0009] Determine the type of the material tank, and obtain the reference weight value and correction ratio calculation parameter setting value corresponding to the material tank type; the correction ratio calculation parameter setting value includes the deviation weight value of the material tank type and the corresponding correction angle value;

[0010] Determining a reference opening of a material flow valve based on the reference weight value;

[0011] Based on the correction ratio calculation parameter setting value, the correction ratio calculation formula is used to calculate the correction ratio; the correction ratio calculation formula is: correction ratio = correction angle value / deviation weight value;

[0012] Based on the correction ratio, the reference weight value and the actual weighing value, the material flow valve execution angle is calculated using the material flow valve execution angle calculation formula; the material flow valve execution angle = reference opening + (actual weighing value - reference weight value) × correction ratio;

[0013] The material flow valve is controlled according to the type of material tank and material distribution conditions and the material flow valve is output according to the calculated execution angle.

[0014] Furthermore, the types of material tanks include: ore and coke.

[0015] Furthermore, the reference weight setting value corresponding to the material tank type is determined according to the blast furnace material batch weight setting.

[0016] Further, determining a reference opening of the flow valve based on the reference weight value includes:

[0017] The flow valve opening corresponding to the reference weight value is set as the reference opening.

[0018] Furthermore, the correction ratio calculation parameter setting value corresponding to the tank type is set based on experience and actual conditions.

[0019] Furthermore, if the actual weight is greater than the reference value, the correction ratio is positive; if the actual weight is less than the reference value, the correction ratio is negative.

[0020] Furthermore, the actual weighing value is obtained, including:

[0021] The weighing data of the material list is transmitted to the weighing hopper;

[0022] The weighing bucket weighs according to the weighing data in the material list to obtain the actual weighing value.

[0023] Advantages and positive effects of the present invention: The present invention provides a method for controlling the weight-based opening of a blast furnace material flow valve, which automatically corrects the material flow valve opening setting value mainly according to the type and weight of the material in the material tank. First, the actual weighing value is obtained; the material tank type is determined, and the reference weight value and the correction ratio calculation parameter setting value corresponding to the material tank type are obtained; the correction ratio calculation parameter setting value includes the deviation weight value of the material tank type and the corresponding correction angle value; the reference opening of the material flow valve is determined based on the reference weight value; based on the correction ratio calculation parameter setting value, the correction ratio calculation formula is used to calculate the correction ratio; the correction ratio calculation formula is: correction ratio = correction angle value / deviation weight value; based on the correction ratio, reference weight value and actual weighing value, the material flow valve execution angle is calculated using the material flow valve execution angle calculation formula; the material flow valve execution angle = reference opening + (actual weighing value - reference weight value) × correction ratio; according to the material tank type and the material distribution conditions, the material flow valve is controlled to output according to the calculated material flow valve execution angle. The present invention reduces the angle control operation of the material flow valve by the post operators; at the same time, it avoids using the same material flow valve opening for each material distribution, stabilizes the number of blast furnace material distribution circles, and improves the effect of the blast furnace spiral material distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 This is a flow chart of a method for controlling the weight-determined opening of a blast furnace material flow valve in an embodiment of the present invention;

[0026] Figure 2 It is a flow chart of the actual process of burden distribution in a bellless and tank-type blast furnace according to an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of a blast furnace material flow valve weight-determined opening control program in an embodiment of the present invention;

[0028] Figure 4 Schematic diagram of the weight-determined opening operation screen in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] like Figure 1 As shown, an embodiment of the present invention provides a method for controlling the weight-based opening of a blast furnace material flow valve, the method specifically comprising the following steps:

[0032] S101, obtaining the actual weighing value;

[0033] S102, determining the type of the material tank, and obtaining the reference weight value and correction ratio calculation parameter setting value corresponding to the material tank type;

[0034] The correction ratio calculation parameter setting value includes the deviation weight value of the tank type and the corresponding correction angle value;

[0035] S103, determining a reference opening of the flow valve based on the reference weight value;

[0036] S104, based on the correction ratio calculation parameter setting value, using the correction ratio calculation formula to calculate the correction ratio;

[0037] The correction ratio calculation formula is: correction ratio = correction angle value / deviation weight value;

[0038] S105, calculating the material flow valve execution angle using a material flow valve execution angle calculation formula based on the correction ratio, the reference weight value and the actual weighing value;

[0039] The material flow valve execution angle = reference opening + (actual weighing value - reference weight value) × correction ratio;

[0040] S106, controlling the material flow valve according to the type of material tank and material distribution conditions and outputting the material flow valve execution angle according to the calculated value.

[0041] A method for controlling the weight-based opening of a blast furnace material flow valve provided in the above embodiment automatically corrects the material flow valve opening setting value mainly according to the type and weight of the material in the material tank. First, obtain the actual weighing value; determine the material tank type, and obtain the reference weight value and correction ratio calculation parameter setting value corresponding to the invention material tank type; the invention correction ratio calculation parameter setting value includes the deviation weight value of the material tank type and the corresponding correction angle value; determine the reference opening of the material flow valve based on the invention reference weight value; calculate the correction ratio based on the invention correction ratio calculation parameter setting value; the invention correction ratio calculation formula is: correction ratio = correction angle value / deviation weight value; based on the correction ratio, reference weight value and actual weighing value, calculate the material flow valve execution angle using the material flow valve execution angle calculation formula; the invention material flow valve execution angle = reference opening + (actual weighing value - reference weight value) × correction ratio; control the material flow valve according to the type of material tank and the material distribution conditions and output it according to the calculated invention material flow valve execution angle. The present invention reduces the angle control operation of the material flow valve by the post operators; at the same time, it avoids using the same material flow valve opening for each material distribution, stabilizes the number of blast furnace material distribution circles, and improves the effect of the blast furnace spiral material distribution.

[0042] For ease of understanding, the above-mentioned blast furnace material flow valve weight-based opening control method is explained below from the actual process of burden distribution in a bell-less and tank-type blast furnace.

[0043] like Figure 2 As shown, first prepare the materials:

[0044] S201, the weighing data of the material list is transmitted to the weighing bucket;

[0045] S202, the weighing bucket weighs according to the weighing data of the material list to obtain the actual weighing value;

[0046] S203, calculating the weighing deviation and making weighing corrections, and the material preparation is completed;

[0047] In the specific implementation, Figure 3 As shown, weighing correction includes:

[0048] Reference value setting: Determine the corresponding reference value according to the blast furnace batch weight setting. That is, set the weight of ore and coke in the material list setting as the reference weight; and set the corresponding material flow valve opening as the reference opening.

[0049] Correction ratio calculation parameter setting: According to experience and actual conditions, set the fixed deviation weight values ​​of ore and coke and the corresponding fixed correction angles.

[0050] Calculate the correction ratio: Correction ratio K = angle correction value / weight deviation (if the actual weight is greater than the reference value, it is positive, otherwise it is negative).

[0051] The deviation weight value and correction angle value in the correction ratio calculation formula are both empirical values, which can be adjusted according to experience and actual needs in specific implementation. Figure 4 As shown, for the 1# East tank, the weight reference value of the ore is 41.8t, and the opening reference value is 42.8°; the ore weight deviation is 0.1t, and the angle deviation is 0.17°. Corrections are made according to the weight deviation and angle deviation. The weight reference value of coke is 8.86t, the opening reference value is 29.5°, the ore weight deviation is 0.1t, and the angle deviation is 0.05°. Corrections are made according to the weight deviation and angle deviation. For the 2# West tank, the weight reference value of the ore is 42t, and the opening reference value is 47.8°; the ore weight deviation is 0.1t, and the angle deviation is 0.18°. Corrections are made according to the weight deviation and angle deviation. The weight reference value of coke is 8.96t, the opening reference value is 37.2°, the ore weight deviation is 0.1t, and the angle deviation is 0.05°. Corrections are made according to the weight deviation and angle deviation.

[0052] Calculate the flow valve execution angle: flow valve execution angle = reference angle + (actual weight - reference weight) × correction ratio.

[0053] During specific execution, the program automatically determines the type of tank and selects and outputs the corresponding calculation parameters;

[0054] Finally, the angle output is controlled according to the logical combination of material tank type and material distribution conditions to ensure that the corresponding angle can be output when distributing coke or ore.

[0055] After the material preparation is completed, the material must be discharged. The material flow, discharge speed and discharge time are adjusted and controlled by the material flow valve:

[0056] S204, transmitting the weighed weight to the intermediate hopper;

[0057] S205, discharging materials from the intermediate hopper;

[0058] S206, the weighing data is transmitted to the main belt data storage area;

[0059] S207, main belt simulated material flow;

[0060] S208, the weighing data is transmitted to the data storage area of ​​the furnace top material tank;

[0061] S209. The material type and weight data of the material tank are transmitted to the furnace top.

[0062] The material flow valve control mode is fixed angle distribution: if the type is ore, it is fixed at 37°; if the type is coke, it is 42°. In the embodiment of the present invention, the opening is determined by weight, and the type of material can be automatically determined by the program. The corresponding reference weight and reference distribution angle are set according to the type, and then the deviation between the actual weight and the reference weight is calculated. The weight deviation is multiplied by the angle correction ratio to obtain the angle that needs to be corrected. Finally, the execution angle of the material flow valve is obtained by summing the correction angle and the reference distribution angle.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the opening of a blast furnace material flow valve by weight, characterized in that: The method comprises: Get the actual weighing value; Determine the type of the material tank, and obtain the reference weight value and correction ratio calculation parameter setting value corresponding to the material tank type; the correction ratio calculation parameter setting value includes the deviation weight value of the material tank type and the corresponding correction angle value; Determining a reference opening of a material flow valve based on the reference weight value; Based on the correction ratio calculation parameter setting value, the correction ratio is calculated using the correction ratio calculation formula; the correction ratio calculation formula is: correction ratio = correction angle value / deviation weight value; if the actual weight is greater than the reference value, the correction ratio is positive; if the actual weight is less than the reference value, the correction ratio is negative; Based on the correction ratio, the reference weight value and the actual weighing value, the material flow valve execution angle is calculated using the material flow valve execution angle calculation formula; the material flow valve execution angle = reference opening + (actual weighing value - reference weight value) × correction ratio; The material flow valve is controlled according to the type of material tank and material distribution conditions and the material flow valve is output according to the calculated execution angle.

2. A method for controlling the opening of a blast furnace material flow valve by weight according to claim 1, characterized in that: The types of material tanks include: ore and coke.

3. A method for controlling the opening of a blast furnace material flow valve by weight according to claim 1, characterized in that: The reference weight setting value corresponding to the type of material tank is determined according to the blast furnace material batch weight setting.

4. A method for controlling the opening of a blast furnace material flow valve by weight according to claim 1, characterized in that: Determining a reference opening of a material flow valve based on the reference weight value includes: The material flow valve opening corresponding to the reference weight value is set as the reference opening.

5. A method for controlling the opening of a blast furnace material flow valve by weight according to claim 1, characterized in that: The correction ratio calculation parameter setting value corresponding to the type of material tank is set based on experience and actual conditions.

6. A method for controlling the opening of a blast furnace material flow valve by weight according to claim 1, characterized in that: Get actual weighing value, including: The weighing data of the material list is transmitted to the weighing hopper; The weighing bucket weighs according to the weighing data in the material list to obtain the actual weighing value.

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