Multivariable control method for carbon content of silicon iron furnace

Abstract

The invention provides a multivariable control method for the carbon content of a ferrosilicon furnace, and is applied to the technical field of ferrosilicon-manganese alloy smelting. The method comprises the following steps: acquiring multivariable parameters for the carbon addition amount of the silicon iron furnace; the multiple parameters comprise an electrode current, a power factor, an artificial iron control parameter, an electrode pressure release amount, an electrode position, a furnace gas size, a weight of fly ash, hole opening time, a molten iron temperature and a hole opening flow rate; setting a judgment quantity, wherein the judgment quantity has an initial value; for each parameter in the multivariable parameters, adding different numerical values to the judgment quantity according to different conditions of parameter values to obtain a final accumulated value of the judgment quantity; when the accumulated value of the final judgment quantity is larger than a first threshold value, the silicon iron furnace is judged to be high in carbon intensity, and the carbon adding quantity is reduced by a first preset quantity; and when the accumulated value of the final judgment quantity is smaller than a second threshold value, the silicon iron furnace is judged to be carbon-deficient, and the carbon addition quantity is increased by a first preset quantity. According to the method, the carbon addition amount can be adjusted in time, and the purposes of stabilizing the furnace condition, reducing the unit consumption and improving the yield are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ferrosilicon-manganese alloy smelting, and in particular to a multivariable control method for carbon content in a ferrosilicon furnace. Background Art

[0002] With the development of the silicon-manganese-ferroalloy smelting industry, fluctuations in the quality of raw materials may affect the quality of the final product and the stability of the production process. It is necessary to continuously develop new smelting technologies and processes to improve production efficiency and product quality.

[0003] In the smelting process of silicon-manganese-iron alloy, the carbon content plays a key role. Insufficient carbon content in the burden ratio will lead to poor fluidity of the charge, stickiness of the charge, and affect the permeability of the charge. Poor permeability will make it difficult to discharge heat and gas, affecting the reaction and possibly causing incomplete melting of the charge. Excessive carbon content in the burden ratio will cause the electrode to be inserted shallowly in the charge, making the working end of the electrode too short. If the working end of the electrode is too short, the heat will be concentrated at the root or around the electrode, resulting in excessively high local temperature. Excessively high local temperature will cause a large hot air flow to be ejected, causing heat loss and increased power consumption. Local high temperature and piercing fire will slow down the chemical reaction in the furnace and affect production efficiency.

[0004] The carbon content directly affects the chemical reaction efficiency, the working state of the electrodes and the overall energy consumption in the furnace. Therefore, a multivariable control method for the carbon content of a ferrosilicon furnace is needed. Summary of the invention

[0005] The present invention aims to provide a multivariable control method for the carbon content of a ferrosilicon furnace. By accurately controlling the carbon content, the negative impact caused by insufficient or excessive carbon content can be avoided, thereby improving the overall efficiency and product quality of the ferrosilicon manganese alloy smelting process.

[0006] According to one aspect of the present invention, there is provided a multivariable control method for carbon content of a ferrosilicon furnace, comprising:

[0007] Obtain multivariable parameters for carbon content of ferrosilicon furnace; the multivariable parameters include electrode current, power factor, ferrosilicon control parameters, electrode pressure release, electrode position, furnace gas size, dust removal ash weight, eye opening time, molten iron temperature and eye opening flow rate;

[0008] Setting a judgment amount, wherein the judgment amount has an initial value;

[0009] For each parameter in the multivariable parameters, different values ​​are added to the judgment amount according to different conditions of the parameter values ​​to obtain a final accumulated value of the judgment amount;

[0010] When the accumulated value of the final judgment amount is greater than the first threshold, the ferrosilicon furnace is judged to be carbon-rich, and the carbon amount is reduced by the first preset amount; when the accumulated value of the final judgment amount is less than the second threshold, the ferrosilicon furnace is judged to be carbon-deficient, and the carbon amount is increased by the first preset amount.

[0011] According to some embodiments, the electrode current is determined by the electrode rise and fall length:

[0012] The data source of the electrode current is the current transformer on the primary side of the transformer, and the secondary side current is obtained by conversion through the transformer gear position;

[0013] The data source of the electrode lifting length is a pull rope displacement sensor installed on the electrode;

[0014] When the electrode changes more than 70 mm within one minute, but the current changes less than 5 A, the value of the judgment amount is increased by -1;

[0015] When the electrode changes more than 100 mm within one minute, but the current changes less than 5 A, the value of the judgment amount is increased by -2;

[0016] The increase and decrease values ​​of the judgment amount corresponding to the parameters of the electrode current are -1 and -3.

[0017] According to some embodiments, the judgment value of the power factor is 0.83 and 0.90, and the data of the power factor is derived from an electric energy meter;

[0018] When the power factor value is less than 0.83, the value of the judgment value is increased by 3;

[0019] When the power factor value is greater than 0.90, the value of the judgment value is increased by -3;

[0020] When the value of the power factor is greater than 0.83 and less than 0.90, the value of the judgment value remains unchanged;

[0021] The judgment amount increase and decrease values ​​corresponding to the power factor parameter are 3 and -3.

[0022] According to some embodiments, the judgment values ​​of the Yitie control parameter are 10.5 and 11.5, and the electric furnace operation status index is obtained by the secondary side current and active power;

[0023] When the control parameter of the iron is greater than 11.5, the value of the judgment amount is increased by 1;

[0024] When the control parameter is less than 10.5, the value of the judgment amount is increased by -1;

[0025] When the control parameter is greater than 10.5 and less than 11.5, the value of the judgment amount remains unchanged;

[0026] The judgment value increase and decrease values ​​corresponding to the control parameter are 1 and -1.

[0027] According to some embodiments, the judgment value of the electrode pressure release is 430 mm and 500 mm, and the electrode pressure release is measured by an encoder meter wheel on the electrode;

[0028] When the electrode pressing amount is less than 430 mm, the value of the judgment amount is increased by 1;

[0029] When the electrode pressing amount is greater than 500 mm, the value of the judgment amount is increased by -1;

[0030] When the electrode pressing amount is greater than 430 mm and less than 500 mm, the value of the judgment amount remains unchanged;

[0031] The increase and decrease values ​​of the judgment amount corresponding to the parameter of the electrode pressure release amount are 1 and -1.

[0032] According to some embodiments, the judgment value of the electrode position is 500 mm and 800 mm, and the data of the electrode position is obtained by a pull-wire displacement sensor installed on the electrode;

[0033] When the electrode position is greater than 800 mm, the value of the judgment amount is increased by 1;

[0034] When the electrode position is less than 500 mm, the value of the judgment amount is increased by -1;

[0035] When the electrode position is less than 500 mm and greater than 800 mm, the value of the judgment amount remains unchanged;

[0036] The increase and decrease values ​​of the judgment amount corresponding to the parameters of the electrode position are 1 and -1.

[0037] According to some embodiments, the furnace gas is determined by the furnace operator, and the size of the furnace gas is related to the length of the furnace gas injection:

[0038] When the length of the furnace gas injection is greater than 4 meters, the value of the judgment amount is increased by 1;

[0039] When the length of the furnace gas injection is less than 3 meters, the value of the judgment amount is increased by -1;

[0040] When the length of the furnace gas injection is between 3 meters and 4 meters, the value of the judgment amount remains unchanged;

[0041] The increase and decrease values ​​of the judgment amount corresponding to the parameters of the furnace gas are 1 and -1.

[0042] According to some embodiments, when the weight of the dust removal ash accounts for more than 20% of the output, the value of the judgment amount is increased by 1;

[0043] When the weight of the dust removal ash accounts for less than 17% of the output, the value of the judgment amount is increased by -1;

[0044] When the weight of the dust removal ash accounts for a proportion of the output that is greater than 17% and less than 20%, the value of the judgment amount remains unchanged;

[0045] The increase and decrease values ​​of the judgment amount corresponding to the dust removal ash weight parameter are 1 and -1.

[0046] According to some embodiments, the judgment value of the eye opening time is 5 minutes and 15 minutes, and the eye opening time is judged by the eye opening personnel and input into the computer;

[0047] When the eye opening time is less than 5 minutes, the value of the judgment amount is increased by 1;

[0048] When the eye opening time is greater than 15 minutes, the value of the judgment amount is increased by -1;

[0049] When the eye opening time is greater than 5 minutes and less than 15 minutes, the judgment value remains unchanged;

[0050] The increase and decrease values ​​of the judgment amount corresponding to the parameter of the eye opening time are 1 and -1.

[0051] The eye opening flow rate is determined by the time of the flow rate, and the time determination value of the flow rate is 10 minutes and 15 minutes. The eye opening flow rate is determined by the eye opening personnel and input into the computer;

[0052] When the flow rate time is less than 10 minutes, the value of the judgment amount is increased by 1;

[0053] When the flow rate time is greater than 15 minutes, the value of the judgment amount is increased by -1;

[0054] When the flow rate is between 10 minutes and 15 minutes, the value of the judgment amount remains unchanged;

[0055] The judgment amount increase and decrease values ​​corresponding to the parameters of the eye opening flow rate are 1 and -1.

[0056] According to some embodiments, the judgment value of the molten iron temperature is 1450 degrees Celsius and 1550 degrees Celsius;

[0057] When the molten iron temperature is less than 1450 degrees Celsius, the value of the judgment amount is increased by 1;

[0058] When the molten iron temperature is greater than 1550 degrees Celsius, the value of the judgment amount is increased by -1;

[0059] When the molten iron temperature is between 1450 degrees Celsius and 1550 degrees Celsius, the value of the judgment amount remains unchanged;

[0060] The increase and decrease values ​​of the judgment amount corresponding to the parameter of the molten iron temperature are 1 and -1.

[0061] According to another aspect of the present invention, a computer program product is provided, comprising a computer program, wherein the computer program implements any of the above methods when executed by a processor.

[0062] According to another aspect of the present invention, there is provided a computing device, comprising:

[0063] Processor; and

[0064] A memory stores a computer program, and when the computer program is executed by the processor, the processor is caused to perform any of the aforementioned methods.

[0065] According to the exemplary embodiment of the present invention, multivariable parameters are set, and through real-time monitoring and analysis of multivariable parameter data, the furnace condition can be judged more accurately, and appropriate adjustments can be made according to the judgment results. Based on the analysis of multivariable parameters, factors that may affect the stability of the furnace condition can be discovered and corrected in a timely manner, and then the carbon content can be adjusted more accurately to make the carbon addition more reasonable, thereby improving smelting efficiency and maintaining the continuity and stability of production. By setting the judgment amount and adjusting it according to the specific circumstances of each parameter, more precise control of the production process can be achieved, the scientificity and accuracy of decision-making can be improved, and comprehensive consideration of various parameters can be used to allocate resources more reasonably, and finally confirm the appropriate increase or decrease in carbon content, thereby optimizing the entire production process.

[0066] According to some embodiments, a multivariable control method for the carbon content of a ferrosilicon furnace sets a judgment amount and makes adjustments based on multivariable parameters. As production conditions change, the system can automatically make dynamic adjustments to maintain the optimal carbon content. By timely adjusting the carbon content, the chemical reaction conditions in the entire production process can be optimized, the chemical reaction efficiency can be improved, and thus the production efficiency can be improved. By setting the cumulative value of the judgment amount to guide the adjustment of the carbon content, it is possible to improve production efficiency, reduce costs, and ensure product quality.

[0067] It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0069] Figure 1 A flow chart showing a multivariable control method for carbon dosage in a ferrosilicon furnace according to an example embodiment.

[0070] Figure 2A schematic block diagram is shown of a multivariable control method for carbon dosage in a ferrosilicon furnace according to an example embodiment.

[0071] Figure 3 A block diagram of a computing device according to an example embodiment of the invention is shown. DETAILED DESCRIPTION

[0072] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0073] In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solution of the present invention can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring various aspects of the present invention.

[0074] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0075] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0076] It should be understood that although the terms first, second, third, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another component. Therefore, the first component discussed below can be referred to as the second component without departing from the teachings of the present inventive concept. As used herein, the term "and / or" includes any one of the associated listed items and all combinations of one or more.

[0077] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the present invention are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0078] Those skilled in the art will appreciate that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present invention, and therefore cannot be used to limit the protection scope of the present invention.

[0079] The smelting of ferrosilicon manganese alloy is an important metallurgical process, which is widely used in the steel industry. Carbon is an important component of the charge. In the smelting process of ferrosilicon manganese alloy, insufficient carbon content will increase the viscosity of the charge and deteriorate the permeability of the charge surface, which will lead to insufficient oxygen supply in the furnace, slow chemical reaction rate, and extend the smelting time; when the carbon content is too much, the insertion depth of the electrode in the charge will become shallower, the working end of the electrode is too short, and the heat concentration will cause a high-pressure high-temperature hot air flow at the root or around the electrode, resulting in heat loss. Insufficient or excessive carbon content will have an adverse effect on the smelting process. Introduce an automated control system to automatically adjust the carbon content according to real-time data to improve control accuracy.

[0080] Exemplary embodiments of the present invention are described below with reference to the accompanying drawings.

[0081] Figure 1 A flow chart showing a multivariable control method for carbon dosage in a ferrosilicon furnace according to an example embodiment.

[0082] Through the multivariable control method of the present invention, the operator can timely adjust the carbon dosage according to the real-time monitoring data, thereby achieving the goals of stabilizing the furnace condition, reducing unit consumption and increasing production.

[0083] See also Figure 1 In S101, multivariable parameters for carbon content of ferrosilicon furnace are obtained; the multivariable parameters include electrode current, power factor, ferrosilicon control parameters, electrode pressure release, electrode position, furnace gas size, dust removal ash weight, eye opening time, molten iron temperature and eye opening flow rate.

[0084] According to an example embodiment, a series of parameters are obtained from the ferrosilicon furnace, including electrode current, power factor, ferrosilicon control parameters, electrode pressure release, electrode position, furnace gas size, dust ash weight, eye opening time, molten iron temperature and eye opening flow rate. Among them, the electrode current reflects the working state of the electrode, the power factor reflects the effective utilization of the power equipment, the ferrosilicon control parameters combine the current and active power to reflect the equipment operation state, the electrode pressure release reflects the consumption of the electrode, the electrode position reflects the height of the electrode in the furnace, the furnace gas size reflects the gas flow and combustion in the furnace, the dust ash weight reflects the complete combustion degree of the raw materials in the furnace, and the eye opening time reflects the difficulty of eye opening; the molten iron temperature reflects the temperature control during the smelting process, and the eye opening flow rate reflects the speed at which the molten iron flows out. These parameters jointly reflect the combustion of the ferrosilicon manganese alloy in the furnace.

[0085] In S103, a judgment amount is set, and the judgment amount has an initial value.

[0086] According to the example embodiment, the judgment amount is set to facilitate cumulative calculation based on the multivariable parameters, and finally obtain a result that comprehensively reflects the operating status of the ferrosilicon furnace. The judgment amount has an initial value, and for the convenience of calculation, the initial value can be defined as zero.

[0087] In S105, for each parameter in the multivariate parameters, different values ​​are added to the judgment amount according to different conditions of the parameter values ​​to obtain a final accumulated value of the judgment amount.

[0088] According to the exemplary embodiment, based on the multivariable parameters, a judgment amount accumulation mechanism for multiple parameters is set, each parameter has an independent judgment amount, such as m1 to m10, for each parameter, according to different conditions of the parameter value, a corresponding positive number or negative number is added to the independent judgment amount, and then these independent judgment amounts are accumulated to obtain a final judgment amount M. The judgment amount accumulation mechanism is described in detail in detail in the following. Figure 2 .

[0089] In S107, when the accumulated value of the final judgment amount is greater than the first threshold, the ferrosilicon furnace is judged to be carbon-rich, and the carbon amount is reduced by a first preset amount; when the accumulated value of the final judgment amount is less than the second threshold, the ferrosilicon furnace is judged to be carbon-deficient, and the carbon amount is increased by a first preset amount.

[0090] According to the example embodiment, a first threshold and a second threshold are set, and in this embodiment, the threshold is positive and the second threshold is negative. If the cumulative value of the final judgment amount M is greater than the first threshold, the ferrosilicon furnace is judged to be carbon-intensive, and the carbon amount is reduced by a first preset amount, which is 1% of the current carbon amount; if the cumulative value of the final judgment amount M is less than the second threshold, the ferrosilicon furnace is judged to be carbon-deficient, and the carbon amount is increased by a first preset amount; if the cumulative value of the final judgment amount M is between the first threshold and the second threshold, it reflects that the furnace condition is normal in this state, and the carbon amount remains unchanged.

[0091] This embodiment can comprehensively reflect the operation status of the ferrosilicon furnace by setting the judgment amount and accumulating and calculating multiple independent carbon amounts. The final accumulated value of the judgment amount can be used to determine whether the carbon amount needs to be adjusted and the direction and amplitude of the adjustment. The method is helpful to achieve real-time monitoring and dynamic adjustment, thereby improving production efficiency and product quality.

[0092] Figure 2 A schematic block diagram is shown of a multivariable control method for carbon dosage in a ferrosilicon furnace according to an example embodiment.

[0093] According to an exemplary embodiment, the multivariable control system for the carbon content of the ferrosilicon furnace sets ten multivariable parameters, see Figure 2 The first parameter is the electrode current, the second parameter is the power factor, the third parameter is the Yi iron control parameter, the fourth parameter is the electrode pressure release, the fifth parameter is the electrode position, the sixth parameter is the furnace gas size, the seventh parameter is the dust ash weight, the eighth parameter is the eye opening time, the ninth parameter is the molten iron temperature, and the tenth parameter is the eye opening flow rate.

[0094] The multivariate parameters and furnace condition judgment criteria are shown in Table 1.

[0095] Table 1. Standards for judging the furnace condition of ferro-silicon manganese alloy submerged arc furnace

[0096]

[0097] The electrode current is determined by the electrode lifting length. The data source of the electrode current is the current transformer on the primary side of the transformer. The secondary side current is converted by the transformer gear. The data source of the electrode lifting length is the pull rope displacement sensor installed on the electrode. When the electrode changes by more than 70mm within one minute, but the current changes by less than 5A, the value of the judgment amount is increased by -1. When the electrode changes by more than 100mm within one minute, but the current changes by less than 5A, the value of the judgment amount is increased by -2.

[0098] The judgment values ​​of the power factor are 0.83 and 0.90. The data of the power factor comes from the electric energy meter. When the value of the power factor is less than 0.83, the value of the judgment quantity is increased by 3. When the value of the power factor is greater than 0.90, the value of the judgment quantity is increased by -3. When the value of the power factor is greater than 0.83 and less than 0.90, the value of the judgment quantity remains unchanged.

[0099] The judgment value of the Yitie control parameter is 10.5 and 11.5, and the electric furnace operation state index is obtained by the secondary side current and active power. When the Yitie control parameter is greater than 11.5, the value of the judgment amount is increased by 1, when the Yitie control parameter is less than 10.5, the value of the judgment amount is increased by -1, and when the Yitie control parameter is greater than 10.5 and less than 11.5, the value of the judgment amount remains unchanged.

[0100] The judgment values ​​of the electrode pressure release are 430mm and 500mm. The electrode pressure release is measured by the encoder meter wheel on the electrode. When the electrode pressure release is less than 430mm, the value of the judgment amount is increased by 1. When the electrode pressure release is greater than 500mm, the value of the judgment amount is increased by -1. When the electrode pressure release is greater than 430mm and less than 500mm, the value of the judgment amount remains unchanged.

[0101] The judgment values ​​of the electrode position are 500mm and 800mm. The data of the electrode position is obtained by a pull-wire displacement sensor installed on the electrode. When the electrode position is greater than 800mm, the value of the judgment amount is increased by 1. When the electrode position is less than 500mm, the value of the judgment amount is increased by -1. When the electrode position is less than 500mm and greater than 800mm, the value of the judgment amount remains unchanged.

[0102] The furnace gas is judged by the furnace operator, and the size of the furnace gas is related to the length of the furnace gas injection. When the length of the furnace gas injection is greater than 4 meters, the value of the judgment amount is increased by 1. When the length of the furnace gas injection is less than 3 meters, the value of the judgment amount is increased by -1. When the length of the furnace gas injection is between 3 meters and 4 meters, the value of the judgment amount remains unchanged.

[0103] The weight of the dust ash, when the weight of the dust ash accounts for more than 20% of the output, the value of the judgment amount is increased by 1; when the weight of the dust ash accounts for less than 17% of the output, the value of the judgment amount is increased by -1; when the weight of the dust ash accounts for more than 17% and less than 20% of the output, the value of the judgment amount remains unchanged.

[0104] The judgment value of the eyes opening time is 5 minutes and 15 minutes. The eyes opening time is judged by the person opening the eyes and input into the computer. When the eyes opening time is less than 5 minutes, the value of the judgment amount is increased by 1. When the eyes opening time is greater than 15 minutes, the value of the judgment amount is increased by -1. When the eyes opening time is greater than 5 minutes and less than 15 minutes, the judgment value remains unchanged.

[0105] The judgment values ​​of the molten iron temperature are 1450 degrees Celsius and 1550 degrees Celsius. When the molten iron temperature is less than 1450 degrees Celsius, the value of the judgment quantity is increased by 1. When the molten iron temperature is greater than 1550 degrees Celsius, the value of the judgment quantity is increased by -1. When the molten iron temperature is between 1450 degrees Celsius and 1550 degrees Celsius, the value of the judgment quantity remains unchanged.

[0106] The eye opening flow rate is judged by the flow rate time, and the flow rate time judgment values ​​are 10 minutes and 15 minutes. The eye opening flow rate is judged by the eye opening personnel and input into the computer. When the flow rate time is less than 10 minutes, the value of the judgment amount is increased by 1. When the flow rate time is greater than 15 minutes, the value of the judgment amount is increased by -1. When the flow rate time is between 10 minutes and 15 minutes, the value of the judgment amount remains unchanged.

[0107] The increase and decrease values ​​of the judgment amount m1 corresponding to the parameter of the electrode current are -1 and -3.

[0108] The increase and decrease values ​​of the judgment quantity m2 corresponding to the power factor parameter are 3 and -3.

[0109] The increase and decrease values ​​of the judgment quantity m3 corresponding to the said control parameter are 1 and -1.

[0110] The increase and decrease values ​​of the judgment amount m4 corresponding to the parameter of the electrode pressure release amount are 1 and -1.

[0111] The increase and decrease values ​​of the judgment amount m5 corresponding to the parameter of the electrode position are 1 and -1.

[0112] The increase and decrease values ​​of the judgment quantity m6 corresponding to the parameter of the furnace gas size are 1 and -1.

[0113] The increase and decrease values ​​of the judgment quantity m7 corresponding to the dust removal ash weight parameter are 1 and -1.

[0114] The increase and decrease values ​​of the judgment amount m8 corresponding to the parameter of the eye opening time are 1 and -1.

[0115] The increase and decrease values ​​of the judgment amount m9 corresponding to the parameter of the eye opening flow rate are 1 and -1.

[0116] The judgment value increase and decrease values ​​corresponding to the parameter of the molten iron temperature are 1 and -1.

[0117] Judgment amount M:

[0118] M=m1+m2+m3+m4+m5+m6+m7+m8+m9+m10

[0119] In this embodiment, the first threshold is set to 6 and the second threshold is set to -6. When the cumulative value of the final judgment amount M is greater than 6, the ferrosilicon furnace is judged to be carbon-rich, and the carbon amount is reduced by 1%; when the cumulative value of the final judgment amount is less than -6, the ferrosilicon furnace is judged to be carbon-deficient, and the carbon amount is increased by 1%; when the cumulative value of the judgment amount M is between -6 and 6, the carbon content of the ferrosilicon furnace is judged to be normal and no adjustment is made.

[0120] According to some embodiments, by adopting the multivariable control method, the operator can timely adjust the carbon dosage according to the feedback results of each parameter, and the output has increased from the original 70 tons to the current 80 tons, and the unit consumption has been reduced from the original 8200 to 8000, thereby achieving stable furnace conditions, reducing unit consumption and increasing output.

[0121] This embodiment additionally adopts low-voltage reactive compensation to adapt to the working conditions of electric furnace smelting to meet production needs. The reactive compensation on the low-voltage side can be in two ways: three-phase common compensation and phase-splitting compensation. The phase-splitting compensation method is preferred for the reactive compensation on the low-voltage side of the submerged arc furnace. During the smelting process of the submerged arc furnace, due to the change in the molten state of the ore, the operator often needs to adjust the working conditions, which will cause irregular changes in the impedance of the three-phase electrode. The phase-splitting compensation can be adjusted independently according to the actual needs of each phase to better adapt to this imbalance. The capacitance compensation of each phase can be independently controlled, which can more accurately compensate for the reactive power demand of each phase, especially when the reactive power consumption of the three-phase electrode at different smelting time points is quite different.

[0122] By compensating for reactive power loss on site, the current in the line can be reduced, thereby reducing energy loss on the line. The compensated system can maintain a higher terminal voltage level, which is essential for ensuring good contact between the electrode and the ore and improving arc stability. Phase-splitting compensation can reduce reactive current passing through the upper transformer, thereby reducing the reactive power loss of the transformer and increasing the active power output of the transformer. The capacity of the transformer can be used more effectively, which can support greater active power output, thereby improving the production capacity and efficiency of the entire system.

[0123] It can improve the utilization rate of transformer high-current lines. For arc smelting, the generation of reactive power is mainly caused by arc current. By moving the compensation point forward to the short network, a large amount of reactive power consumption of the short network can be compensated on-site, thereby improving the output of the transformer and increasing the effective input power of smelting.

[0124] Through the phase-splitting compensation method, not only can the reactive current of the power grid be reduced, the line loss can be reduced, and the terminal voltage can be increased, but also the reactive loss of the transformer can be reduced, thereby improving the active output of the transformer. Ultimately, it will help improve the overall efficiency of the smelting system of the submerged arc furnace, reduce energy waste, increase production, and provide operators with more flexible control methods to cope with changing working conditions. Effectively improve the power factor. The reactive power consumption of the submerged arc furnace is mainly in the transformer and the short-circuit network. The implementation of low-voltage reactive power compensation not only compensates for the loss of the short-circuit network and the transformer on the spot, but also compensates for the loss of the high-voltage line, which greatly improves the power factor.

[0125] The low-voltage reactive power compensation of the electric arc furnace in this example embodiment has excellent advantages in improving power factor, absorbing harmonics, and increasing production and reducing consumption, targeting the large amount of reactive power consumption and imbalance of the short network on the low-voltage side of the furnace transformer.

[0126] Figure 3 A block diagram of a computing device according to an example embodiment of the invention is shown.

[0127] like Figure 3 As shown, computing device 30 includes processor 12 and memory 14. Computing device 30 may also include bus 22, network interface 16, and I / O interface 18. Processor 12, memory 14, network interface 16, and I / O interface 18 may communicate with each other via bus 22.

[0128] The processor 12 may include one or more general-purpose CPUs (Central Processing Units, processors), microprocessors, or application-specific integrated circuits, etc., for executing relevant program instructions.

[0129] The memory 14 may include a machine system readable medium in the form of a volatile memory, such as a random access memory (RAM), a read-only memory (ROM) and / or a cache memory. The memory 14 is used to store one or more programs including instructions and data. The processor 12 can read the instructions stored in the memory 14 to execute the above-mentioned method according to the embodiment of the present invention.

[0130] The computing device 30 may also communicate with one or more networks via the network interface 16. The network interface 16 may be a wireless network interface.

[0131] The bus 22 may include an address bus, a data bus, a control bus, etc. The bus 22 provides a path for exchanging information between components.

[0132] It should be noted that, in the specific implementation process, the computing device 30 may also include other components necessary for normal operation. In addition, those skilled in the art may understand that the above device may only include components necessary for implementing the embodiments of this specification, and need not include all components shown in the figure.

[0133] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the above method when executed by a processor. The computer-readable storage medium may include, but is not limited to, any type of disk, including a floppy disk, an optical disk, a DVD, a CD-ROM, a microdrive, and a magneto-optical disk, a ROM, a RAM, an EPROM, an EEPROM, a DRAM, a VRAM, a flash memory device, a magnetic card or an optical card, a nanosystem (including a molecular memory IC), a network storage device, a cloud storage device, or any type of medium or device suitable for storing instructions and / or data.

[0134] An embodiment of the present invention also provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute part or all of the steps of any method recorded in the above method embodiments.

[0135] Those skilled in the art can clearly understand that the technical solution of the present invention can be implemented with the help of software and / or hardware. "Unit" and "module" in this specification refer to software and / or hardware that can independently complete or cooperate with other components to complete specific functions, where the hardware can be, for example, a field programmable gate array, an integrated circuit, etc.

[0136] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0137] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0138] In the several embodiments provided by the present invention, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0139] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0140] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0141] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the whole or part of the technical solution can be embodied in the form of a software product, which is stored in a memory and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention.

[0142] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0143] The exemplary embodiments of the present invention are specifically shown and described above. It should be understood that the present invention is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present invention is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended clauses.

[0144] Those skilled in the art can clearly understand that the technical solution of the present invention can be implemented with the help of software and / or hardware. "Unit" and "module" in this specification refer to software and / or hardware that can independently complete or cooperate with other components to complete specific functions, where the hardware can be, for example, a field programmable gate array, an integrated circuit, etc.

[0145] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0146] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0147] In the several embodiments provided by the present invention, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0148] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0149] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0150] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the whole or part of the technical solution can be embodied in the form of a software product, which is stored in a memory and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention.

[0151] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0152] The exemplary embodiments of the present invention are specifically shown and described above. It should be understood that the present invention is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present invention is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended clauses.

Claims

1. A multivariable control method for carbon content in a ferrosilicon furnace, characterized in that: include: Obtain multivariable parameters for carbon content of ferrosilicon furnace; the multivariable parameters include electrode current, power factor, ferrosilicon control parameters, electrode pressure release, electrode position, furnace gas size, dust removal ash weight, eye opening time, molten iron temperature and eye opening flow rate; Setting a judgment amount, wherein the judgment amount has an initial value; For each parameter in the multivariable parameters, different values ​​are added to the judgment amount according to different conditions of the parameter values ​​to obtain a final accumulated value of the judgment amount; When the accumulated value of the final judgment amount is greater than the first threshold, the ferrosilicon furnace is judged to be carbon-rich, and the carbon amount is reduced by the first preset amount; when the accumulated value of the final judgment amount is less than the second threshold, the ferrosilicon furnace is judged to be carbon-deficient, and the carbon amount is increased by the first preset amount.

2. The multivariable control method according to claim 1, characterized in that: include: The electrode current is determined by the electrode lifting length; The data source of the electrode current is the current transformer on the primary side of the transformer, and the secondary side current is obtained by conversion through the transformer gear position; The data source of the electrode lifting length is a pull rope displacement sensor installed on the electrode; When the electrode changes more than 70 mm within one minute, but the current changes less than 5 A, the value of the judgment amount is increased by -1; When the electrode changes more than 100 mm within one minute, but the current changes less than 5 A, the value of the judgment amount is increased by -2; The increase and decrease values ​​of the judgment amount corresponding to the parameters of the electrode current are -1 and -3.

3. The method according to claim 1, characterized in that include: The power factor judgment values ​​are 0.83 and 0.90, and the power factor data is derived from an electric energy meter; When the power factor value is less than 0.83, the value of the judgment value is increased by 3; When the power factor value is greater than 0.90, the value of the judgment value is increased by -3; When the value of the power factor is greater than 0.83 and less than 0.90, the value of the judgment value remains unchanged; The judgment amount increase and decrease values ​​corresponding to the power factor parameter are 3 and -3.

4. The method according to claim 2, characterized in that: include: The judgment values ​​of the Yi Tie control parameter are 10.5 and 11.5, and the Yi Tie control parameter is obtained by the secondary side current and active power; When the control parameter of the iron is greater than 11.5, the value of the judgment amount is increased by 1; Case No.: 240096CI When the control parameter is less than 10.5, the value of the judgment amount is increased by -1; When the control parameter is greater than 10.5 and less than 11.5, the value of the judgment amount remains unchanged; The judgment value increase and decrease values ​​corresponding to the control parameter are 1 and -1.

5. The method according to claim 2, characterized in that: include: The judgment values ​​of the electrode pressure release amount are 430mm and 500mm, and the electrode pressure release amount is measured by the encoder meter wheel on the electrode; When the electrode pressing amount is less than 430 mm, the value of the judgment amount is increased by 1; When the electrode pressing amount is greater than 500 mm, the value of the judgment amount is increased by -1; When the electrode pressing amount is greater than 430 mm and less than 500 mm, the value of the judgment amount remains unchanged; The increase and decrease values ​​of the judgment amount corresponding to the parameter of the electrode pressure release amount are 1 and -1.

6. The method according to claim 1, characterized in that include The judgment values ​​of the electrode position are 500 mm and 800 mm, and the data of the electrode position is obtained by a pull-wire displacement sensor installed on the electrode; When the electrode position is greater than 800 mm, the value of the judgment amount is increased by 1; When the electrode position is less than 500 mm, the value of the judgment amount is increased by -1; When the electrode position is less than 500 mm and greater than 800 mm, the value of the judgment amount remains unchanged; The increase and decrease values ​​of the judgment amount corresponding to the parameters of the electrode position are 1 and -1.

7. The method according to claim 1, characterized in that include: The size of the furnace gas is determined by the furnace operator, and the size of the furnace gas is related to the length of the furnace gas injection; When the length of the furnace gas injection is greater than 4 meters, the value of the judgment amount is increased by 1; When the length of the furnace gas injection is less than 3 meters, the value of the judgment amount is increased by -1; When the length of the furnace gas injection is between 3 meters and 4 meters, the value of the judgment amount remains unchanged; The increase and decrease values ​​of the judgment amount corresponding to the parameter of the furnace gas size are 1 and -1.

8. The method according to claim 1, characterized in that: include: The weight of the dust removed is such that when the weight of the dust removed accounts for more than 20% of the output, the value of the judgment amount is increased by 1; When the weight of the dust removal ash accounts for less than 17% of the output, the value of the judgment amount is increased by -1; When the weight of the dust ash accounts for more than 17% and less than 20% of the output, the value of the judgment amount Case No.: 240096CI constant; The increase and decrease values ​​of the judgment amount corresponding to the dust removal ash weight parameter are 1 and -1.

9. The method according to claim 1, characterized in that: include: The judgment value of the eye opening time is 5 minutes and 15 minutes. The eye opening time is judged by the eye opening personnel and input into the computer; When the eye opening time is less than 5 minutes, the value of the judgment amount is increased by 1; When the eye opening time is greater than 15 minutes, the value of the judgment amount is increased by -1; When the eye opening time is greater than 5 minutes and less than 15 minutes, the value of the judgment amount remains unchanged; The increase and decrease values ​​of the judgment amount corresponding to the eye opening time parameter are 1 and -1; The eye opening flow rate is determined by the time of the flow rate, and the time determination value of the flow rate is 10 minutes and 15 minutes. The eye opening flow rate is determined by the eye opening personnel and input into the computer; When the flow rate time is less than 10 minutes, the value of the judgment amount is increased by 1; When the flow rate time is greater than 15 minutes, the value of the judgment amount is increased by -1; When the flow rate is between 10 minutes and 15 minutes, the value of the judgment amount remains unchanged; The judgment amount increase and decrease values ​​corresponding to the parameters of the eye opening flow rate are 1 and -1.

10. The method according to claim 1, characterized in that include: The judgment values ​​of the molten iron temperature are 1450 degrees Celsius and 1550 degrees Celsius; When the molten iron temperature is less than 1450 degrees Celsius, the value of the judgment amount is increased by 1; When the molten iron temperature is greater than 1550 degrees Celsius, the value of the judgment amount is increased by -1; When the molten iron temperature is between 1450 degrees Celsius and 1550 degrees Celsius, the value of the judgment amount remains unchanged; The increase and decrease values ​​of the judgment amount corresponding to the parameter of the molten iron temperature are 1 and -1.

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