Material mixing control method of sintering machine

Abstract

The invention relates to a material mixing control method for a sintering machine, and belongs to the technical field of steelmaking methods. According to the technical scheme, the stirring speed of the mixing equipment is determined based on the feeding particle granularity and the feeding density distribution of the mixing equipment, the stirring duration of the mixing equipment is determined based on the feeding type number and the feeding particle size distribution of the mixing equipment, and the mixing equipment is controlled to mix materials based on the first stirring speed and the first stirring duration. The mixing device has the beneficial effects that raw materials with different granularities, densities and types can be more sufficiently mixed in the mixing device, so that the uniformity of the mixture in the aspects of chemical components and physical properties is ensured, and the quality stability of a sintered product is improved.

Description

Technical Field

[0001] The invention relates to a sintering machine material mixing control method, belonging to the technical field of steelmaking methods. Background Art

[0002] Sintering machines play a vital role in the steel industry. They are used to sinter mixed raw materials such as powdered or fine-grained iron-containing raw materials (such as iron ore concentrate, powder ore, etc.), flux (such as limestone, dolomite) and fuel (such as coke powder) into agglomerated sintered ore. The basic principle is to use the heat generated by the combustion of fuel in the mixture to melt part of the materials in the mixture, and then cool and solidify to form sintered ore with a certain strength and particle size. Through the sintering process, the physical and chemical properties of the raw materials can be improved, such as improving permeability, removing some harmful impurities, adjusting chemical composition, etc., thereby improving the production efficiency of the blast furnace and the quality of molten iron.

[0003] The existing sintering machine mixing control cannot ensure the uniform distribution of various raw materials (such as iron-containing raw materials, flux, fuel, etc.) in the mixture, resulting in local differences in the chemical composition of the sintered ore, such as inconsistent strength and uneven reducibility, which affects its physical and metallurgical properties. Summary of the invention

[0004] The object of the present invention is to provide a sintering machine mixing control method, which can make raw materials of different particle sizes, densities and types more fully mixed in the mixing equipment by accurately determining the stirring speed and stirring time, thereby ensuring the uniformity of the mixture in terms of chemical composition and physical properties, thereby improving the quality stability of the sintered product, and effectively solving the above-mentioned problems existing in the background technology.

[0005] The technical solution of the present invention is: a sintering machine mixing control method, comprising the following steps:

[0006] (1) determining a first stirring speed of the mixing device based on the feed particle size and feed density distribution of the mixing device, presetting a reference value of the stirring speed, a reference value of the feed particle size, and a reference value of the feed density, and on this basis, selecting the largest feed particle size and the largest feed density, and calculating the first stirring speed of the mixing device based on the positive correlation between the largest feed particle size and the largest feed density and the first stirring speed;

[0007] (2) determining a first stirring time of the mixing device based on the number of feed types and feed particle size distribution of the mixing device, presetting a reference value of the stirring time, a reference value of the number of feed types, and a reference value of the feed particle size difference, and on this basis, determining the difference between the maximum feed particle size and the minimum feed particle size according to the actual feed particle size distribution, obtaining the feed particle size difference, and calculating the first stirring time of the mixing device based on the positive correlation between the number of feed types and the feed particle size difference and the first stirring time;

[0008] (3) Controlling a mixing device to mix materials based on a first stirring speed and a first stirring time.

[0009] The step (3) comprises the following steps:

[0010] Controlling the operation of the mixing device based on the first stirring speed;

[0011] After the first stirring time, the uniformity of the mixture is tested according to the first cycle, and the number of tests is more than one;

[0012] When the uniformity of the mixture obtained by N consecutive tests is greater than the uniformity threshold, the mixing device is controlled to discharge the material; N is a natural number, and the value of N is a first value.

[0013] It also includes detecting the particle size distribution of the mixture, which is a material obtained by mixing multiple raw materials in a mixing device. When the maximum particle size of the mixture is greater than the particle size threshold, the value of N is set to a second value. The particle size threshold is determined based on the particle size of the feed particles, and the second value is greater than the first value.

[0014] It also includes detecting the particle size distribution of the mixture, where the mixture is a material obtained by mixing multiple raw materials in a mixing device. When the maximum particle size of the mixture is greater than a particle size threshold, the mixing device is controlled alternately at a first stirring speed and a second stirring speed; the first stirring speed is less than the second stirring speed, and the switching time between the first stirring speed and the second stirring speed is less than the first threshold.

[0015] The method also includes determining a total water addition amount of the mixing device based on a feed amount, feed humidity and target humidity of the mixing device, and performing water addition control of the mixing device based on the total water addition amount.

[0016] The water addition control of the mixing device based on the total water addition amount includes: determining a single water addition amount based on a feed amount of the mixing device, a feed water absorption rate of each raw material and a first stirring speed; determining the number of water additions based on the total water addition amount and the single water addition amount; and controlling the water addition of the mixing device based on the single water addition amount and the number of water additions.

[0017] The method for determining a single water addition amount based on the feed amount of the mixing device, the feed water absorption rate of each raw material and the first stirring speed includes: determining a corresponding first water addition adjustment coefficient based on the feed water absorption rate of each raw material; determining a second water addition adjustment coefficient of the mixing device based on the first water addition adjustment coefficient of each raw material and the corresponding component proportion; determining a third water addition adjustment coefficient of the mixing device based on the first stirring speed and a reference value of the stirring speed; adjusting a reference value of a unit water addition amount based on the second water addition adjustment coefficient and the third water addition adjustment coefficient to obtain a unit water addition amount; the reference value of the unit water addition amount is the water addition amount corresponding to the feed amount per unit mass under specified conditions, and the specified conditions are determined by the reference value of the stirring speed; and obtaining a single water addition amount based on the feed amount of the mixing device and the unit water addition amount.

[0018] A sintering machine mixing control system comprises a first calculation module, a second calculation module and an output control module, wherein the first calculation module, the second calculation module and the output control module are connected in sequence, and the output control module is connected to a mixing device.

[0019] A sintering machine mixing control electronic device comprises a processor, an input device, an output device and a memory, wherein the processor, the input device, the output device and the memory are communicatively connected via a communication bus.

[0020] A computer-readable storage medium for sintering machine mixing control stores a computer program, which implements the steps of the method according to any one of claims 1 to 7 when executed by a processor.

[0021] The beneficial effect of the present invention is that by accurately determining the stirring speed and stirring time, raw materials of different particle sizes, densities and types can be more fully mixed in the mixing equipment, thereby ensuring the uniformity of the chemical composition and physical properties of the mixture, thereby improving the quality stability of the sintered product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a flow chart of the method of the present invention;

[0023] Figure 2 It is a structural block diagram of the sintering machine mixing control system of the present invention;

[0024] Figure 3 is a schematic block diagram of the electronic device for controlling mixing of a sintering machine according to the present invention;

[0025] In the figure: a first computing module 21 , a second computing module 22 , an output control module 23 , a processor 301 , an input device 302 , an output device 303 , a memory 304 , and a communication bus 305 . DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions in the implementation cases of the present invention will be clearly and completely described below in conjunction with the drawings in the implementation cases. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] A sintering machine mixing control method comprises the following steps:

[0028] (1) determining a first stirring speed of the mixing device based on the feed particle size and feed density distribution of the mixing device, presetting a reference value of the stirring speed, a reference value of the feed particle size, and a reference value of the feed density, and on this basis, selecting the largest feed particle size and the largest feed density, and calculating the first stirring speed of the mixing device based on the positive correlation between the largest feed particle size and the largest feed density and the first stirring speed;

[0029] (2) determining a first stirring time of the mixing device based on the number of feed types and feed particle size distribution of the mixing device, presetting a reference value of the stirring time, a reference value of the number of feed types, and a reference value of the feed particle size difference, and on this basis, determining the difference between the maximum feed particle size and the minimum feed particle size according to the actual feed particle size distribution, obtaining the feed particle size difference, and calculating the first stirring time of the mixing device based on the positive correlation between the number of feed types and the feed particle size difference and the first stirring time;

[0030] (3) Controlling a mixing device to mix materials based on a first stirring speed and a first stirring time.

[0031] The step (3) comprises the following steps:

[0032] Controlling the operation of the mixing device based on the first stirring speed;

[0033] After the first stirring time, the uniformity of the mixture is tested according to the first cycle, and the number of tests is more than one;

[0034] When the uniformity of the mixture obtained by N consecutive tests is greater than the uniformity threshold, the mixing device is controlled to discharge the material; N is a natural number, and the value of N is a first value.

[0035] It also includes detecting the particle size distribution of the mixture, which is a material obtained by mixing multiple raw materials in a mixing device. When the maximum particle size of the mixture is greater than the particle size threshold, the value of N is set to a second value. The particle size threshold is determined based on the particle size of the feed particles, and the second value is greater than the first value.

[0036] It also includes detecting the particle size distribution of the mixture, where the mixture is a material obtained by mixing multiple raw materials in a mixing device. When the maximum particle size of the mixture is greater than a particle size threshold, the mixing device is controlled alternately at a first stirring speed and a second stirring speed; the first stirring speed is less than the second stirring speed, and the switching time between the first stirring speed and the second stirring speed is less than the first threshold.

[0037] The method also includes determining a total water addition amount of the mixing device based on a feed amount, feed humidity and target humidity of the mixing device, and performing water addition control of the mixing device based on the total water addition amount.

[0038] The water addition control of the mixing device based on the total water addition amount includes: determining a single water addition amount based on a feed amount of the mixing device, a feed water absorption rate of each raw material and a first stirring speed; determining the number of water additions based on the total water addition amount and the single water addition amount; and controlling the water addition of the mixing device based on the single water addition amount and the number of water additions.

[0039] The method for determining a single water addition amount based on the feed amount of the mixing device, the feed water absorption rate of each raw material and the first stirring speed includes: determining a corresponding first water addition adjustment coefficient based on the feed water absorption rate of each raw material; determining a second water addition adjustment coefficient of the mixing device based on the first water addition adjustment coefficient of each raw material and the corresponding component proportion; determining a third water addition adjustment coefficient of the mixing device based on the first stirring speed and a reference value of the stirring speed; adjusting a reference value of a unit water addition amount based on the second water addition adjustment coefficient and the third water addition adjustment coefficient to obtain a unit water addition amount; the reference value of the unit water addition amount is the water addition amount corresponding to the feed amount per unit mass under specified conditions, and the specified conditions are determined by the reference value of the stirring speed; and obtaining a single water addition amount based on the feed amount of the mixing device and the unit water addition amount.

[0040] A sintering machine mixing control system comprises a first calculation module 21, a second calculation module 22 and an output control module 23, wherein the first calculation module 21, the second calculation module 22 and the output control module 23 are connected in sequence, and the output control module 23 is connected to a mixing device.

[0041] A sintering machine mixing control electronic device comprises a processor 301, an input device 302, an output device 303 and a memory 304, wherein the processor 301, the input device 302, the output device 303 and the memory 304 are communicatively connected via a communication bus 305.

[0042] A computer-readable storage medium for sintering machine mixing control stores a computer program, which implements the steps of the method according to any one of claims 1 to 7 when executed by a processor.

[0043] In practical application, the operation steps of the present invention are as follows:

[0044] S101: Determine a first stirring speed of a mixing device based on a feed particle size and a feed density distribution of the mixing device.

[0045] In this embodiment, the feed particle size refers to the size of the raw material particles entering the mixing device, which is usually expressed by the diameter of the particles, and the unit can be millimeter (mm), micrometer (μm), etc. For example, in the sintering machine mixing, the iron ore particles may be several millimeters in size, while the particle size of some additive powders may be in the micron level.

[0046] Feed density distribution refers to the density difference of raw material particles entering the mixing equipment. Different raw materials have different densities. For example, the density of iron ore concentrate is relatively large, while the density of some light-burned dolomite is relatively small.

[0047] Considering that large-sized particles require greater force to push and flip during the stirring process to achieve uniform mixing, small-sized particles have a larger specific surface area and can achieve better mixing effects at a lower stirring speed. For example, large-sized ore particles may form local accumulation during stirring. If the stirring speed is insufficient, it is difficult to break this accumulation state, resulting in uneven mixing.

[0048] At the same time, it is considered that raw materials with higher density are more difficult to be moved during the mixing process than raw materials with lower density. For example, when mixing a mixture containing a large amount of iron ore, due to the high density of the iron ore, it is not easy to be stirred at a lower speed. Therefore, a higher stirring speed is required to ensure that the iron ore particles can be evenly dispersed; while the limestone particles with lower density may be well mixed at a lower stirring speed.

[0049] Therefore, in order to make the stirring speed of the mixing device suitable for the actual needs of different raw materials, the present embodiment determines the first stirring speed of the mixing device based on the feed particle size and feed density distribution of the mixing device. Specifically, the reference value of the stirring speed, the reference value of the feed particle size, and the reference value of the feed density can be pre-set, and on this basis, the largest feed particle size and the largest feed density are selected, and the first stirring speed of the mixing device can be calculated based on the positive correlation between the largest feed particle size, the largest feed density, and the first stirring speed.

[0050] For example, the first stirring speed of the mixing device can be calculated using a first formula, which is:

[0051]

[0052] Wherein, V represents the first stirring speed, V 0 Indicates the reference value of the first stirring speed, D 0 Indicates the reference value of feed particle size, ρ 0Indicates the base value of feed density, D max represents the maximum feed particle size, ρ max represents the maximum feed density, ω 1 and ω 2 is the weight coefficient.

[0053] S102: Determine a first stirring time of the mixing device based on the number of feed types and feed particle size distribution of the mixing device.

[0054] In this embodiment, the number of feed types refers to the number of different raw materials entering the mixing device. In the mixing process of the sintering machine, the feed usually contains a variety of different raw materials, such as iron-containing raw materials (iron ore, iron concentrate, etc.), flux (limestone, dolomite, etc.), fuel (coke, coal powder, etc.) and possible additives (such as bentonite, etc. for improving sintering performance).

[0055] Feed particle size distribution describes the distribution of the particle sizes of the raw materials entering the mixing equipment. The feed particle size distribution can be determined by particle size analysis methods (such as screening method, laser particle size analysis method, etc.).

[0056] Considering that the more types of raw materials there are, the longer the mixing time is often required to ensure that each raw material is evenly mixed. For example, in the sintering machine mixing, if there are iron-containing raw materials, multiple fluxes (such as limestone, dolomite) and fuel at the same time, it takes more time to ensure that the various ingredients are fully mixed compared to the case of mixing only two raw materials.

[0057] At the same time, it is considered that when there is a large difference in the particle size of the feed, the stirring time will be extended. For example, in a mixture containing coarse particles of ore and fine particles of concentrate powder, the movement of the coarse particles is relatively slow, and the fine particles are easy to flow in the gaps between the coarse particles. In order to fully mix the coarse and fine particles, sufficient time is required for the fine particles to be evenly wrapped around the coarse particles or evenly distributed between the coarse particles.

[0058] Therefore, in order to make the stirring time of the mixing device suitable for the actual needs of different raw materials, the present embodiment determines the first stirring time of the mixing device based on the number of feed types and feed particle size distribution of the mixing device. Specifically, the reference value of the stirring time, the reference value of the number of feed types and the reference value of the feed particle size difference can be pre-set, and on this basis, according to the actual feed particle size distribution, the difference between the maximum feed particle size and the minimum feed particle size is determined to obtain the feed particle size difference, and the first stirring time of the mixing device can be calculated based on the positive correlation between the number of feed types, the feed particle size difference and the first stirring time.

[0059] For example, the first stirring time of the mixing device can be calculated using the second formula, which is:

[0060]

[0061] Wherein, T represents the first stirring time, T 0 Indicates the reference value of the first stirring time, S 0 Indicates the reference value of the number of feed types, C 0 represents the reference value of feed size difference, S represents the number of feed types, C represents the feed size difference, ω 3 and ω 4 is the weight coefficient.

[0062] S103: Controlling a mixing device to mix materials based on a first stirring speed and a first stirring duration.

[0063] In this embodiment, the first stirring speed and the first stirring duration are both key operating parameters of the mixing device. After determining the appropriate first stirring speed and first stirring duration, the operation of the mixing device can be controlled accordingly to fully mix the various feeds. For example, according to the set first stirring speed and first stirring duration, the stirring blade is accurately driven to rotate to mix the feeds.

[0064] It can be concluded from the above that this embodiment can accurately adjust the stirring speed of the mixing device based on the feed particle size and feed density distribution of the mixing device, and can accurately adjust the stirring time of the mixing device based on the feed type quantity and feed particle size distribution of the mixing device.

[0065] By accurately determining the stirring speed and duration, raw materials of different particle sizes, densities and types can be more fully mixed in the mixing equipment, thereby ensuring the uniformity of the mixture in terms of chemical composition and physical properties (such as permeability), thereby improving the quality stability of the sintered products.

[0066] In one embodiment of the present invention, controlling a mixing device to mix materials based on a first stirring speed and a first stirring duration includes:

[0067] Controlling the operation of the mixing device based on the first stirring speed;

[0068] After the first stirring time, multiple tests of the uniformity of the mixture are performed according to the first cycle;

[0069] In response to the mixing uniformity obtained by N consecutive detections being greater than the uniformity threshold, the mixing device is controlled to discharge the material; N is a natural number, and the value of N is a first value.

[0070] In this embodiment, the uniformity of the mixture is used to characterize the uniformity of the distribution of various raw materials in the mixture during the mixing process. The uniformity of the mixture can be detected by using a mixing uniformity detector, which emits light of a specific wavelength to illuminate the surface of the mixed raw materials. The uniformity of the mixture will affect the propagation and reflection of the light. Therefore, by measuring the intensity or distribution of the reflected or transmitted light and analyzing the changes in the light, the uniformity of the mixture can be determined. For example, the uniformity can be measured by calculating the relative standard deviation (RSD) of the absorption peak intensity. The relative standard deviation calculation formula is:

[0071]

[0072] The smaller the RSD value, the higher the mixing uniformity. Based on this, (1-RSD) can be determined as the mixing uniformity.

[0073] At the beginning of stirring, the mixing device can be controlled to work at the first stirring speed. After the first stirring time, the raw materials have basically reached a uniformly mixed state. In order to ensure the uniformity of the mixture, a fixed time interval (i.e., the first cycle) can be set, and the uniformity of the mixture is tested in each first cycle after the first stirring time. For example, the first cycle can be set to 5 minutes, that is, the uniformity of the mixture in the mixing device is tested every 5 minutes. If the uniformity of the mixture obtained by N consecutive tests is greater than the pre-set uniformity threshold, it indicates that the state of uniform mixing has been achieved. At this time, the mixing device can be controlled to stop stirring and the mixed mixture can be output from the device so as to enter the next production link (such as entering the sintering link after mixing in the sintering machine).

[0074] Among them, N and the uniformity threshold are both preset constants, and their specific values ​​can be determined according to actual production needs. For example, N can be set to 3 times, 5 times, etc., and the uniformity threshold can be set to 80%, 90%, etc. Setting up multiple consecutive tests can ensure that the uniformity of the mixture can continuously and stably reach a high level, rather than judging it as qualified when it meets the requirements occasionally.

[0075] From the above, it can be concluded that this embodiment determines the actual stirring time based on the first stirring time and based on multiple detections of the mixing uniformity. On the basis of ensuring the mixing uniformity, unnecessary stirring time is reduced as much as possible to achieve refined control of the stirring time.

[0076] In one embodiment of the present invention, the sintering machine mixing control method further includes:

[0077] To test the particle size distribution of the mixture; the mixture is a material obtained by mixing multiple raw materials in a mixing device;

[0078] In response to the maximum particle size of the mixture being greater than a particle size threshold, the value of N is set to a second value; the particle size threshold is determined based on the particle size of the feed particles, and the second value is greater than the first value.

[0079] In this embodiment, a plurality of raw materials are mixed in a mixing device to form a mixture, and the particle size distribution of the mixture can be detected by a professional particle size detection instrument such as a laser particle size analyzer. The laser particle size analyzer calculates the size and particle size distribution of the particles based on the scattered light characteristics generated by the laser irradiating the particles. By detecting the particle size distribution, it is possible to understand in real time whether there is an abnormal particle size in the mixture, such as whether there are too many large particles or small particles aggregated, and the uniformity of the particle size.

[0080] Before mixing, a suitable particle size threshold can be determined based on the various feed particle sizes of the mixing equipment. If the feed particles are originally small in size, but large particles far exceeding the original feed particle size range are detected after mixing, it can be judged that agglomeration has occurred during the mixing process, that is, during the mixing process of the raw materials, the particles aggregate with each other due to various physical or chemical effects to form larger aggregates, thereby reducing the uniformity of the mixture.

[0081] In the above case, in order to ensure the uniformity of the mixture, the stirring time needs to be increased to break up the agglomerated particles. Specifically, the number of consecutive detections N can be increased, that is, in more consecutive detections, the uniformity of the mixture is greater than the pre-set uniformity threshold, and then the mixture is judged to be uniformly mixed.

[0082] It can be concluded from the above that this embodiment can detect the agglomeration of the mixture in time by real-time detection of the particle size distribution of the mixture. At the same time, the control parameter (ie, the N value) is dynamically adjusted according to the actual particle size of the mixture, making the mixing process more intelligent and precise.

[0083] In one embodiment of the present invention, the sintering machine mixing control method further includes:

[0084] To test the particle size distribution of the mixture; the mixture is a material obtained by mixing multiple raw materials in a mixing device;

[0085] In response to the particle size of the mixture being greater than a particle size threshold, the mixing device is controlled alternately at a first stirring speed and a second stirring speed; the mixture is a material obtained by mixing multiple raw materials in the mixing device;

[0086] The first stirring speed is less than the second stirring speed, and a switching time between the first stirring speed and the second stirring speed is less than a first threshold.

[0087] In this embodiment, if it is detected that the particle size of the mixture is greater than the particle size threshold, that is, the agglomeration of the mixture is detected, the mixing can be performed in an intermittent acceleration manner. For example, in the first period, the mixing is performed at a first stirring speed. After the first period ends, the stirring speed is quickly switched from the first stirring speed to the second stirring speed. The agglomerates are instantly subjected to a large external force. This sudden increase in external force can effectively overcome the attraction between the particles (such as van der Waals force, electrostatic attraction, etc.), so that the agglomerates are quickly broken up. After controlling the mixing device to run at a higher second stirring speed for the second period, it is run at a lower first stirring speed, and the cycle is repeated to achieve particle separation in the agglomerates.

[0088] Among them, a PID controller can be used to control the speed of the mixing device. At this time, the response speed of the PID controller can be improved by setting a larger proportional coefficient and a smaller integral time to limit the switching time between the first stirring speed and the second stirring speed to below a first threshold. The first threshold is a preset constant, and those skilled in the art can set it according to actual needs.

[0089] From the above, it can be concluded that the present embodiment can effectively break up the agglomerates through intermittent accelerated stirring, so that the agglomerated particles are redistributed evenly in the mixture. Compared with continuous high-speed stirring, intermittent accelerated stirring can avoid excessive particle breakage and changes in the properties of the raw materials, and at the same time, reduce the power consumption of the equipment.

[0090] In this embodiment, considering that the speed regulation performance of the mixing device is different, it will affect the setting of the first threshold. If the speed range of the mixing device is wide, it means that the motor of the mixing device can cross different speed intervals in a shorter time and has a stronger speed regulation ability. Therefore, when the speed range of the mixing device is wide, the first threshold can be set smaller to achieve rapid speed switching and increase the impact force when the speed is switched.

[0091] At the same time, considering that there may be materials with lower hardness and easy to break in the materials of the mixing equipment, in order to avoid material breakage caused by drastic changes in stirring speed, it is necessary to increase the first threshold value to make the speed switching process smoother.

[0092] Therefore, in this embodiment, the first threshold is set based on the rotation speed range of the mixing device and the hardness of the specified material. Specifically, the first threshold can be calculated based on the following third formula:

[0093]

[0094] Among them, TH represents the first threshold, TH 0 represents the reference value of the first threshold, R represents the speed regulation range of the mixing device, and R 0 Indicates the reference value of the speed regulation range, Y 0represents the reference value of the material hardness, Y represents the hardness value of the specified material in the mixing device, and b and a are both preset proportional parameters. The specified material can be selected by those skilled in the art according to the characteristic parameters of each material in the mixing device, and the reference value of the first threshold, the reference value of the speed adjustment range and the reference value of the hardness are all preset constants.

[0095] In one embodiment of the present disclosure, the sintering machine mixing control method further includes:

[0096] Determine the total amount of water added to the mixing device based on the feed amount, feed humidity and target humidity of the mixing device;

[0097] The water addition control of the mixing equipment is carried out based on the total water addition amount.

[0098] In this embodiment, during the mixing process of the sintering machine, many raw materials are in powder or granular form. Adding an appropriate amount of water can make these particles have a certain viscosity, thereby improving the fluidity of the raw materials; at the same time, the appropriate amount of water added can adjust the pore structure of the mixture, thereby affecting its air permeability. If the air permeability is too poor, the air cannot pass through the material layer smoothly, which will lead to incomplete combustion of the fuel and affect the sintering effect; and if the air permeability is too good, the heat will be lost too quickly, which is not conducive to sintering. By controlling the amount of water added, the mixture can form an appropriate pore structure to ensure good air permeability during the sintering process. Therefore, it is necessary to determine the target humidity of the mixture according to the process requirements of the sintered product, and control the amount of water added based on the target humidity. For example, the target humidity can be set between 6% and 8%. This humidity range is conducive to the spheroidization and air permeability of the mixture, thereby ensuring the smooth progress of the sintering process.

[0099] Taking into account that the raw materials themselves have a certain humidity, if the feed humidity of a certain raw material is higher, it means that the raw material itself already contains a certain amount of moisture. In order to achieve the target humidity, the amount of additional water required will be reduced accordingly; conversely, if the feed humidity is lower, more water will need to be added to make up for the lack of moisture.

[0100] Therefore, this embodiment determines the total amount of water added to the mixing device based on the feed amount, feed humidity and target humidity of the mixing device. Specifically, the total amount of water added can be calculated using the following fourth formula:

[0101]

[0102] Among them, x represents the total amount of water added, n represents the number of feed types, m i represents the feed amount of the i-th raw material, h i represents the humidity (i.e., water content) of the i-th raw material, and H represents the target humidity.

[0103] It can be concluded from the above that, when calculating the total amount of water added, this embodiment takes into account the influence of the humidity of the raw materials themselves on the total amount of water added, which is beneficial to improving the calculation accuracy of the total amount of water added and can make the humidity of the mixture accurately reach the target humidity.

[0104] In one embodiment of the present invention, the water addition control of the mixing device is performed based on the total water addition amount, including:

[0105] Determine the single water addition amount based on the feed amount of the mixing device, the feed water absorption rate of the raw material and the first stirring speed;

[0106] Determine the number of water additions based on the total amount of water added and the amount of water added each time;

[0107] The water addition control of the mixing equipment is carried out based on the single water addition amount and the number of water additions.

[0108] In this embodiment, during the mixing process, adding water in multiple times can better coordinate the stirring process and fully mix the raw materials and water. Considering that too much water is added at one time, it is difficult to evenly distribute the water in all the raw materials in a short time. For some raw materials with poor water absorption, too much water may form water accumulation on their surface, causing the raw materials to agglomerate or form a muddy state. To avoid the above problems, the amount of water added at a single time can be determined based on the feed amount of the mixing equipment and the feed water absorption rate of the raw materials.

[0109] At the same time, considering that the stirring speed has an important influence on the distribution and absorption speed of water in the material, a higher first stirring speed can make the water diffuse faster in the material. Therefore, when the stirring speed is fast, the amount of water added at a time can be appropriately increased; on the contrary, when the stirring speed is slow, the diffusion and absorption of water are slow, and the amount of water added at a time can be appropriately reduced.

[0110] Therefore, this embodiment determines the single water addition amount based on the feed amount of the mixing device, the feed water absorption rate of the raw material and the first stirring speed. On the basis of obtaining the single water addition amount, the total water addition amount is divided by the single water addition amount to obtain the number of water additions. The water addition control of the mixing device is performed according to the single water addition amount and the number of water additions to achieve uniform water addition.

[0111] In one embodiment of the present invention, the single water addition amount is determined based on the feed amount of the mixing device, the feed water absorption rate of each raw material and the first stirring speed, including:

[0112] Determine the corresponding first water addition adjustment coefficient based on the feed water absorption rate of each raw material;

[0113] Determine a second water addition adjustment coefficient for the mixing device based on the first water addition adjustment coefficient for each raw material and the corresponding component proportion;

[0114] Determining a third water addition adjustment coefficient of the mixing device based on the first stirring speed and the reference value of the stirring speed;

[0115] The reference value of the unit water addition amount is adjusted based on the second water addition amount adjustment coefficient and the third water addition amount adjustment coefficient to obtain the unit water addition amount; the reference value of the unit water addition amount is the water addition amount corresponding to the unit mass of the feed amount under specified conditions, and the specified conditions are determined by the reference value of the stirring speed;

[0116] The single water addition amount is obtained based on the feed amount of the mixing equipment and the unit water addition amount.

[0117] In this embodiment, considering that different raw materials have different water absorption rates, raw materials with high water absorption rates have strong water absorption and absorb a large amount of water, while raw materials with low water absorption have weak water absorption and absorb less water. Therefore, this embodiment determines the corresponding first water addition adjustment coefficient based on the feed water absorption rate of each raw material, and adjusts the single water addition amount based on the first water addition adjustment coefficient.

[0118] Specifically, the first water addition adjustment coefficient corresponding to each raw material can be determined based on the feed water absorption rate of each raw material as follows:

[0119] Calculating a first ratio of the water absorption rate of each raw material to the water absorption rate of the reference raw material;

[0120] The first ratio is determined as the water addition adjustment coefficient corresponding to each raw material.

[0121] In this embodiment, a commonly used raw material with a medium water absorption rate can be selected as a reference raw material, such as iron ore concentrate powder, limestone, etc., and the first water addition adjustment coefficient of the reference raw material is set to 1. For other raw materials, such as raw material A, a first ratio of the water absorption rate of raw material A to the water absorption rate of the reference raw material is calculated as the first water addition adjustment coefficient of raw material A. The first water addition adjustment coefficient can be calculated using the following fifth formula:

[0122]

[0123] Among them, k i represents the first water addition adjustment coefficient of the i-th raw material, P i represents the water absorption rate of the i-th raw material, P 0 Indicates the water absorption of the reference raw material.

[0124] On the basis of obtaining the first water addition adjustment coefficient, the first water addition adjustment coefficient of each raw material and the product of the corresponding component proportion can be added together to obtain the second water addition adjustment coefficient of the mixing device. For example, the second water addition adjustment coefficient of the mixing device can be calculated by the following sixth formula:

[0125]

[0126] in, Indicates the second water addition adjustment coefficient of the mixing equipment, ki represents the first water addition adjustment coefficient of the i-th raw material, λ i Indicates the composition ratio of the i-th raw material.

[0127] On the basis of obtaining the second water addition adjustment coefficient and the first stirring speed of the mixing device, the reference value of the unit water addition and the corresponding reference value of the stirring speed can be pre-set, wherein the unit water addition refers to the amount of water required for a unit mass of the mixture, and the unit mass can be 1 ton, 10 tons, etc. The ratio of the first stirring speed of the mixing device to the reference value of the stirring speed is determined as the third water addition adjustment coefficient, and the third water addition adjustment coefficient, the second water addition adjustment coefficient and the reference value of the unit water addition are multiplied to obtain the unit water addition of the mixing device. Then, the feed amounts of each raw material in the mixing device are added to obtain the total feed amount of the mixing device, and the total feed amount of the mixing device is multiplied by the unit water addition to obtain the single water addition amount.

[0128] From the above, it can be concluded that this embodiment comprehensively considers the feed amount, feed water absorption rate and stirring speed to determine the single water addition amount, which can avoid the situation where too much water is added at one time causing local over-humidification, so that the water can be evenly absorbed by the material during the stirring process, thereby ensuring the uniform humidity of the mixture.

[0129] Corresponding to the sintering machine mixing control method of the above embodiment, Figure 2 This is a structural block diagram of a sintering machine mixing control system provided by an embodiment of the present invention. For ease of explanation, only the parts related to the embodiment of the present invention are shown. Figure 2 The sintering machine mixing control system includes: a first calculation module 21, a second calculation module 22 and an output control module 23.

[0130] The first calculation module 21 is used to determine the first stirring speed of the mixing device based on the feed particle size and feed density distribution of the mixing device;

[0131] A second calculation module 22, used to determine a first stirring time of the mixing device based on the number of feed types and feed particle size distribution of the mixing device;

[0132] The output control module 23 is used to control the mixing device to mix materials based on the first stirring speed and the first stirring time.

[0133] In one embodiment of the present invention, the output control module 23 is specifically used for:

[0134] Controlling the operation of the mixing device based on the first stirring speed;

[0135] After the first stirring time, multiple tests of the uniformity of the mixture are performed according to the first cycle;

[0136] In response to the mixing uniformity obtained by N consecutive detections being greater than the uniformity threshold, the mixing device is controlled to discharge the material; N is a natural number, and the value of N is a first value.

[0137] In one embodiment of the present invention, the output control module 23 is further configured to:

[0138] To test the particle size distribution of the mixture; the mixture is a material obtained by mixing multiple raw materials in a mixing device;

[0139] In response to the maximum particle size of the mixture being greater than a particle size threshold, the value of N is set to a second value; the particle size threshold is determined based on the particle size of the feed particles, and the second value is greater than the first value.

[0140] In one embodiment of the present invention, the output control module 23 is further configured to:

[0141] To test the particle size distribution of the mixture; the mixture is a material obtained by mixing multiple raw materials in a mixing device;

[0142] In response to the particle size of the mixture being greater than a particle size threshold, the mixing device is controlled alternately at a first stirring speed and a second stirring speed; the mixture is a material obtained by mixing multiple raw materials in the mixing device;

[0143] The first stirring speed is less than the second stirring speed, and a switching time between the first stirring speed and the second stirring speed is less than a first threshold.

[0144] In one embodiment of the present invention, the output control module 23 is specifically used for:

[0145] Determine the total amount of water added to the mixing device based on the feed amount, feed humidity and target humidity of the mixing device;

[0146] The water addition control of the mixing equipment is carried out based on the total water addition amount.

[0147] In one embodiment of the present invention, the output control module 23 is further configured to:

[0148] Determine the single water addition amount based on the feed amount of the mixing device, the feed water absorption rate of each raw material and the first stirring speed;

[0149] Determine the number of water additions based on the total amount of water added and the amount of water added each time;

[0150] The water addition control of the mixing equipment is carried out based on the single water addition amount and the number of water additions.

[0151] In one embodiment of the present invention, the output control module 23 is further configured to:

[0152] Determine the corresponding first water addition adjustment coefficient based on the feed water absorption rate of each raw material;

[0153] Determine a second water addition adjustment coefficient for the mixing device based on the first water addition adjustment coefficient for each raw material and the corresponding component proportion;

[0154] Determining a third water addition adjustment coefficient of the mixing device based on the first stirring speed and the reference value of the stirring speed;

[0155] The reference value of the unit water addition amount is adjusted based on the second water addition amount adjustment coefficient and the third water addition amount adjustment coefficient to obtain the unit water addition amount; the reference value of the unit water addition amount is the water addition amount corresponding to the unit mass of the feed amount under specified conditions, and the specified conditions are determined by the reference value of the stirring speed;

[0156] The single water addition amount is obtained based on the feed amount of the mixing equipment and the unit water addition amount.

[0157] See also Figure 3 , Figure 3 FIG. 1 is a schematic block diagram of an electronic device provided by an embodiment of the present invention. Figure 3 The electronic device in the embodiment shown includes: one or more processors 301, one or more input devices 302, one or more output devices 303 and one or more memories 304. The processors 301, input devices 302, output devices 303 and memories 304 communicate with each other via a communication bus 305. The memory 304 is used to store computer programs, which include program instructions. The processor 301 is used to execute the program instructions stored in the memory 304. The processor 301 is configured to call the program instructions to execute the functions of each module / unit in the above-mentioned device embodiments, such as Figure 2 The functions of modules 21 to 23 are shown.

[0158] It should be understood that in the embodiment of the present invention, the processor 301 may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0159] The input device 302 may include a touch panel, a fingerprint collection sensor (for collecting the user's fingerprint information and fingerprint direction information), a microphone, etc., and the output device 303 may include a display (LCD, etc.), a speaker, etc.

[0160] The memory 304 may include a read-only memory and a random access memory, and provide instructions and data to the processor 301. A portion of the memory 304 may also include a non-volatile random access memory. For example, the memory 304 may also store information about the device type.

[0161] In a specific implementation, the processor 301, input device 302, and output device 303 described in the embodiment of the present invention can execute the implementation methods described in the first and second embodiments of the sintering machine mixing control method provided in the embodiment of the present disclosure, and can also execute the implementation methods of the electronic device described in the embodiment of the present disclosure, which will not be repeated here.

[0162] In another embodiment of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium stores a computer program, the computer program includes program instructions, the program instructions are executed by the processor to implement all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing related hardware through the computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of each of the above-mentioned method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0163] The computer-readable storage medium may be an internal storage unit of the electronic device of any of the aforementioned embodiments, such as a hard disk or memory of the electronic device. The computer-readable storage medium may also be an external storage device of the electronic device, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device. Further, the computer-readable storage medium may also include both an internal storage unit of the electronic device and an external storage device. The computer-readable storage medium is used to store computer programs and other programs and data required by the electronic device. The computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.

[0164] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this disclosure.

[0165] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the electronic devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0166] In the several embodiments provided in the present application, it should be understood that the disclosed electronic devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and 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. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces or units, or it can be an electrical, mechanical or other form of connection.

[0167] 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 embodiments of the present disclosure.

[0168] 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.

[0169] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A sintering machine mixing control method, characterized in that The following steps are involved: (1) determining a first stirring speed of the mixing device based on the feed particle size and feed density distribution of the mixing device, presetting a reference value of the stirring speed, a reference value of the feed particle size, and a reference value of the feed density, and on this basis, selecting the largest feed particle size and the largest feed density, and calculating the first stirring speed of the mixing device based on the positive correlation between the largest feed particle size and the largest feed density and the first stirring speed; (2) determining a first stirring time of the mixing device based on the number of feed types and feed particle size distribution of the mixing device, presetting a reference value of the stirring time, a reference value of the number of feed types, and a reference value of the feed particle size difference, and on this basis, determining the difference between the maximum feed particle size and the minimum feed particle size according to the actual feed particle size distribution, obtaining the feed particle size difference, and calculating the first stirring time of the mixing device based on the positive correlation between the number of feed types and the feed particle size difference and the first stirring time; (3) Controlling a mixing device to mix materials based on a first stirring speed and a first stirring time.

2. A sintering machine mixing control method according to claim 1, characterized in that: The step (3) includes the following steps: Controlling the operation of the mixing device based on the first stirring speed; After the first stirring time, the uniformity of the mixture is tested according to the first cycle, and the number of tests is more than one; When the uniformity of the mixture obtained by N consecutive tests is greater than the uniformity threshold, the mixing device is controlled to discharge the material; N is a natural number, and the value of N is a first value.

3. A sintering machine mixing control method according to claim 2, characterized in that: It also includes detecting the particle size distribution of the mixture, which is a material obtained by mixing multiple raw materials in a mixing device. When the maximum particle size of the mixture is greater than the particle size threshold, the value of N is set to a second value. The particle size threshold is determined based on the particle size of the feed particles, and the second value is greater than the first value.

4. A sintering machine mixing control method according to claim 2, characterized in that: It also includes detecting the particle size distribution of the mixture, where the mixture is a material obtained by mixing multiple raw materials in a mixing device. When the maximum particle size of the mixture is greater than a particle size threshold, the mixing device is controlled alternately at a first stirring speed and a second stirring speed; the first stirring speed is less than the second stirring speed, and the switching time between the first stirring speed and the second stirring speed is less than the first threshold.

5. A sintering machine mixing control method according to claim 1, characterized in that: The method also includes determining a total water addition amount of the mixing device based on a feed amount, feed humidity and target humidity of the mixing device, and performing water addition control of the mixing device based on the total water addition amount.

6. A sintering machine mixing control method according to claim 5, characterized in that: The water addition control of the mixing device based on the total water addition amount includes: determining a single water addition amount based on a feed amount of the mixing device, a feed water absorption rate of each raw material and a first stirring speed; determining the number of water additions based on the total water addition amount and the single water addition amount; and controlling the water addition of the mixing device based on the single water addition amount and the number of water additions.

7. A sintering machine mixing control method according to claim 6, characterized in that: The method for determining a single water addition amount based on the feed amount of the mixing device, the feed water absorption rate of each raw material and the first stirring speed includes: determining a corresponding first water addition adjustment coefficient based on the feed water absorption rate of each raw material; determining a second water addition adjustment coefficient of the mixing device based on the first water addition adjustment coefficient of each raw material and the corresponding component proportion; determining a third water addition adjustment coefficient of the mixing device based on the first stirring speed and a reference value of the stirring speed; adjusting a reference value of a unit water addition amount based on the second water addition adjustment coefficient and the third water addition adjustment coefficient to obtain a unit water addition amount; the reference value of the unit water addition amount is the water addition amount corresponding to the feed amount per unit mass under specified conditions, and the specified conditions are determined by the reference value of the stirring speed; and obtaining a single water addition amount based on the feed amount of the mixing device and the unit water addition amount.

8. A sintering machine mixing control system, characterized in that: It comprises a first calculation module (21), a second calculation module (22) and an output control module (23), wherein the first calculation module (21), the second calculation module (22) and the output control module (23) are connected in sequence, and the output control module (23) is connected to a mixing device.

9. An electronic device for controlling mixing of sintering machines, characterized in that: The system comprises a processor (301), an input device (302), an output device (303) and a memory (304), wherein the processor (301), the input device (302), the output device (303) and the memory (304) are communicatively connected via a communication bus (305).

10. A computer-readable storage medium for sintering machine mixing control, characterized in that: A computer program is stored, and when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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