LIBS (laser-induced breakdown spectroscopy) technology-based closed-loop control system for chemical components of uniformly mixed material in secondary stockyard

Abstract

The utility model provides an LIBS (laser-induced breakdown spectroscopy) technology-based closed-loop control system for chemical components of uniformly mixed materials in a secondary stockyard, which comprises a batching bin system, a sampling system, a material conveying system, a mixing system, a division system, an LIBS detection system, a waste material recovery system and a computer intelligent batching system, and is characterized in that the batching bin system is used for storing materials and outputting ingredients; the sampling system is used for carrying out full-section sampling on materials; the mixing system is used for receiving materials and uniformly mixing the materials to form uniformly mixed materials; the division system is used for carrying out intermittent division sampling on the uniformly mixed material to obtain a uniformly mixed material sample; the LIBS detection system is used for quickly drying, crushing and grinding the uniformly mixed material sample and detecting chemical components of the uniformly mixed material sample; the waste material recovery system is used for returning the residual uniformly-mixed material and the uniformly-mixed material sample to the material conveying system; the material conveying system is used for conveying materials; and the computer intelligent batching system is used for performing intelligent analysis on LIBS detection data in combination with a pre-batching target and calculating a reasonable proportion adjustment control instruction.

Description

Technical Field

[0001] This utility model belongs to the field of composition analysis technology of mixed materials, and in particular relates to a closed-loop control system for chemical composition of secondary material mixing in a material yard based on LIBS technology. Background Technology

[0002] Currently, the sources of iron-containing raw materials for large-scale integrated iron and steel enterprises at home and abroad are very complex, with nearly 20 or even more varieties of iron ore powder plus iron-containing waste materials in the plant area. In order to maximize the implementation of circular economy and optimize the ore blending structure to reduce costs, secondary material yards are set up. Due to the large variety of iron-containing raw materials, the number of silos in the pre-blending system is limited, and multi-stage ore blending and "BLOCK" stockpiling system are usually adopted. In order to improve the stability of the chemical composition of the blended material, the method of consistent chemical composition control targets in each stage is usually adopted.

[0003] In actual material stockpiling, due to limited stockpiling time, issues with material preparation, feeding, and weighing scales, the composition of the mixed material output from the pre-mixing room fluctuates significantly. Furthermore, traditional production organization models do not have high requirements for the stockpiling process and lack necessary monitoring measures and adjustment methods. Consequently, the only way to improve the stability of the mixed material quality is to reduce the total batch size and increase the number of layers. This leads to a contradiction between batch size and allowable stockpiling time, sometimes even preventing the stockpiling work from being completed within the allotted time.

[0004] Currently, the sampling, testing, and stability evaluation of the blended material quality are mostly carried out by the user unit—the sintering process of the ironmaking plant. The awareness of self-supervision, self-inspection, and self-improvement in the blended material stacking process is generally weak. The blended material is fed to the sintering batching room by flat cutting, and then mixed again through six blending bins. Whether the quality of the blended material is stable or not is highly random, which is also an important reason for the large fluctuation of the chemical composition of sintered ore. Utility Model Content

[0005] This invention provides a closed-loop control system for the chemical composition of secondary material mixing in a LIBS-based material yard, in order to solve the problems of large fluctuations in the composition of the mixing material and unstable quality of the mixing material in the existing technology.

[0006] To address the aforementioned technical problems, this utility model provides a closed-loop control system for the chemical composition of secondary material mixing in a LIBS-based material yard. This system includes a batching silo system, a sampling system, a material conveying system, a mixing system, a fractionation system, a LIBS detection system, a waste material recycling system, and a computer-aided intelligent batching system.

[0007] The batching bin system includes multiple raw material bins, and each raw material bin is equipped with a disc feeder. The raw material bins store materials and the disc feeders output the batching materials according to a preset feeding speed.

[0008] The sampling system includes a head sampler, which is installed above the mixing system and is used to sample the material across its entire cross section.

[0009] The mixing system includes a high-power mixer for receiving materials from the sampling system and mixing them to form a homogenized mixture.

[0010] The reduction system includes a reduction and selection device for intermittently reducing and sampling the homogenized material after it has been mixed by the mixing system to obtain a homogenized material sample.

[0011] The LIBS detection system includes a LIBS detection device, which is located below the reduction system. It is used to quickly dry, crush, and grind the homogenized sample obtained by the reduction system, measure the chemical composition of the homogenized sample, and automatically upload the detection data to the computer intelligent batching system.

[0012] The waste recycling system includes a bucket elevator for returning the remaining blended material and blended material samples to the material conveying system.

[0013] The material conveying system is used to connect the batching silo system with the sampling system, the mixing system with the waste recycling system, and the LIBS detection system with the waste recycling system;

[0014] The computer-aided intelligent batching system intelligently analyzes the detection data from the LIBS detection device in conjunction with the pre-batching target, and calculates reasonable batching adjustment control commands.

[0015] Preferably, the batching bin system further includes an electronic belt scale, which is located below the disc feeder.

[0016] Preferably, the material conveying system includes a pre-batching main belt, with the material loading end of the pre-batching main belt located below the batching silo system and the material unloading end located above the sampling system.

[0017] Preferably, the mixing system further includes a mixing hopper.

[0018] Preferably, the material conveying system includes a first sample conveyor, one end of which is located below the high-intensity mixer, and the other end is located below the mixing hopper.

[0019] Preferably, the material conveying system includes a second sample conveyor connected to the outlet of the LIBS testing device.

[0020] Preferably, the waste disposal system includes a waste collection hopper, which is located below the mixing hopper and below the outlet of the LIBS detection device.

[0021] Preferably, the material conveying system includes a main waste conveyor belt, one end of which is located below the waste collection hopper, and the other end is located on one side of the bucket elevator.

[0022] Compared with related technologies, the closed-loop control system for chemical composition of secondary material mixing in the LIBS-based secondary material yard provided by this utility model has the following advantages:

[0023] 1) Samples are taken from the entire cross section of the machine head for the material laid in layers on the main belt of the pre-batching system. The samples taken are highly representative and will not show obvious segregation.

[0024] 2) The total amount of the mixed material is relatively large. After being thoroughly mixed in a high-intensity mixer, the sample is reduced in size, making the sample more representative.

[0025] 3) The LIBS detection device has rapid drying, crushing, grinding and online detection functions, which can quickly obtain the composition of the mixed material and provide data support for rapid evaluation of the real-time batching effect of the mixed material;

[0026] 4) The system can achieve unmanned operation, and waste materials are automatically recycled and returned to the pre-batching main conveyor belt;

[0027] 5) The system can realize closed-loop control of the pre-mixing and blending system, which can significantly improve the stability of the blended material. Attached Figure Description

[0028] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein:

[0029] Figure 1 A schematic diagram of the structure of the closed-loop control system for the chemical composition of secondary material mixing in the LIBS-based secondary material yard provided by this utility model.

[0030] In the diagram: 1. Raw material silo; 2. Disc feeder; 3. Head sampler; 4. High-intensity mixer; 5. Material reducing and sorting device; 6. LIBS testing device; 7. Bucket elevator; 8. Electronic belt scale; 9. Pre-batching main belt; 10. Mixing material hopper; 11. First sample conveyor; 12. Second sample conveyor; 13. Waste collection hopper; 14. Waste main belt; 15. Computer. Detailed Implementation

[0031] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will understand that modifications and variations can be made to the present application without departing from its scope or spirit. All other embodiments obtained by those skilled in the art based on the embodiments in this application should fall within the scope of protection of the embodiments of this application.

[0032] Example

[0033] A closed-loop control system for the chemical composition of secondary material mixing in a LIBS-based material yard is described in the following reference: Figure 1 It includes a batching silo system, a sampling system, a material conveying system, a mixing system, a reduction system, a LIBS detection system, a waste recycling system, and a computer-controlled intelligent batching system.

[0034] The batching system includes multiple raw material bins 1, each equipped with a disc feeder 2. The raw material bins 1 store materials, and the disc feeders 2 output the materials according to a preset feeding speed. In a preferred embodiment, the batching system also includes an electronic belt scale 8, positioned below the disc feeder 2. The electronic belt scale 8 adjusts the rotational speed of the disc feeder 2, thereby adjusting the feeding rate. The adjusted feeding rate is measured by the electronic belt scale 8, and the measurement data is sent to a computer-based intelligent batching system via interface technology for mixed material quality monitoring.

[0035] The sampling system includes a head sampler 3, which is installed above the mixing system for full-section sampling of materials. In a preferred embodiment, the material conveying system includes a pre-batching main belt 9, with its material loading end positioned below the batching silo system and its material unloading end positioned above the sampling system. The head sampler 3 is installed at the head of the pre-batching main belt 9, and its sampling trough extends rapidly to quickly extract the entire cross-section of the unloaded material, which is then poured into the mixing system.

[0036] The mixing system includes a high-intensity mixer 4 and a mixing hopper 10. The high-intensity mixer 4 has a collection hopper, into which the material poured out by the head sampler 3 is placed. The high-intensity mixer 4 receives the material from the sampling system and mixes it to form a homogenized material. In a preferred embodiment, the material conveying system includes a first sample conveyor 11, with one end of the first sample conveyor 11 positioned below the high-intensity mixer 4 and the mixing hopper 10 positioned below the other end. The high-intensity mixer 4 can operate intermittently. Each time a sample is taken, the high-intensity mixer 4 starts first, and 10 seconds later, the head sampler 3 begins to execute the sampling command. After the material is fully mixed, it is discharged onto the first sample conveyor 11.

[0037] The reduction system includes a reduction and sorting device 5, which is used to intermittently reduce and sample the homogenized material after it has been mixed by the mixing system to obtain homogenized material samples. The reduction and sorting device 5 is a belt conveyor with a scraper, which is arranged perpendicularly to the first sample conveyor 11. Its speed is adjustable and the number of reduced samples is controllable. The material taken by reduction is directly discharged into the LIBS detection system.

[0038] The LIBS detection system includes a LIBS detection device 6, which has a collection hopper located below the reduction system. It is used to quickly dry, crush, and grind the homogenized sample obtained by the reduction system, measure the chemical composition of the homogenized sample, and automatically upload the detection data to the computer intelligent batching system.

[0039] The waste recycling system includes a bucket elevator 7 and a waste collection hopper 13, used to return the remaining homogenized material and homogenized material samples to the material conveying system. The bucket elevator 7 has multiple receiving hoppers, and the waste collection hopper 13 is located below the homogenized material hopper 10. In a preferred embodiment, the material conveying system includes a second sample conveyor 12 connected to the outlet of the LIBS testing device 6. The material conveying system also includes a main waste conveyor belt 14, one end of which is located below the waste collection hopper 13, and the other end is located on one side of the bucket elevator 7. The waste conveyed by the main waste conveyor belt 14 falls directly into the receiving hopper of the bucket elevator 7. The first sample conveyor 11 delivers most of the mixed material to the mixed material collection hopper 10; the waste material discharged from the LIBS testing device 6 also enters the mixed material collection hopper 10 through the second sample conveyor 12; the waste material main belt 14 delivers the material in the mixed material collection hopper 10 to the receiving hopper of the bucket elevator 7, and then the bucket elevator 7 lifts the waste material and discards it onto the pre-mixing main belt 9, completing the closed-loop operation of the sampling and testing system and achieving the goal of unmanned operation.

[0040] The material conveying system includes the pre-batching main belt 9, the first sample conveyor 11, the second sample conveyor 12, and the waste material main belt 14, which are used to connect the batching silo system and the sampling system, the mixing system and the waste material recycling system, and the LIBS detection system and the waste material recycling system, respectively.

[0041] The computer-aided intelligent batching system includes a computer 15, which intelligently analyzes the detection data input from the LIBS detection system and compares the detection data with the target values ​​of the preset chemical composition of the mixed material. It promptly detects deviations and calculates the development trend of the deviations. Based on the batching calculation model, it can provide suggestions for ratio adjustment or directly generate adjustment instructions for the batching bin system, driving the disc feeder to make rapid adjustments. The adjusted feed amount is measured by an electronic belt scale 8, and the measurement data is also sent to the computer 15 through interface technology, and then enters a new round of mixed material quality monitoring.

[0042] This embodiment of the closed-loop control system for the chemical composition of the secondary material mixing material based on LIBS technology realizes closed-loop control of the chemical composition during the secondary material mixing material stacking process and a chemical composition control mode of "batching + sampling + detection + adjustment + optimization and re-batching". It has strong applicability to improve the stability of the chemical composition of the mixing material. The implementation of this system fundamentally stabilizes the composition of the mixing material and the sinter composition, thereby laying the raw material foundation for smooth blast furnace operation and cost reduction.

[0043] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A closed-loop control system for the chemical composition of secondary material mixing in a LIBS-based material yard, characterized in that, This includes a batching silo system, a sampling system, a material conveying system, a mixing system, a fractionation system, a LIBS detection system, a waste recycling system, and a computer-controlled intelligent batching system. The batching bin system includes multiple raw material bins, and each raw material bin is equipped with a disc feeder. The raw material bins store materials and the disc feeders output the batching materials according to a preset feeding speed. The sampling system includes a head sampler, which is installed above the mixing system and is used to sample the material across its entire cross section. The mixing system includes a high-power mixer for receiving materials from the sampling system and mixing them to form a homogenized mixture. The reduction system includes a reduction and selection device for intermittently reducing and sampling the homogenized material after it has been mixed by the mixing system to obtain a homogenized material sample. The LIBS detection system includes a LIBS detection device, which is located below the reduction system. It is used to quickly dry, crush, and grind the homogenized sample obtained by the reduction system, measure the chemical composition of the homogenized sample, and automatically upload the detection data to the computer intelligent batching system. The waste recycling system includes a bucket elevator for returning the remaining blended material and blended material samples to the material conveying system. The material conveying system is used to connect the batching silo system with the sampling system, the mixing system with the waste recycling system, and the LIBS detection system with the waste recycling system; The computer-aided intelligent batching system intelligently analyzes the detection data from the LIBS detection device in conjunction with the pre-batching target, and calculates reasonable batching adjustment control commands.

2. The closed-loop control system for the chemical composition of secondary material mixing in the LIBS-based secondary material yard according to claim 1, characterized in that, The batching bin system also includes an electronic belt scale, which is located below the disc feeder.

3. The closed-loop control system for the chemical composition of secondary material mixing in the LIBS-based secondary material yard according to claim 1, characterized in that, The material conveying system includes a pre-batching main belt, with the material loading end of the pre-batching main belt located below the batching silo system and the material unloading end located above the sampling system.

4. The closed-loop control system for the chemical composition of secondary material mixing in the LIBS-based secondary material yard according to claim 1, characterized in that, The mixing system also includes a mixing hopper.

5. The closed-loop control system for the chemical composition of secondary material mixing in the LIBS-based secondary material yard according to claim 4, characterized in that, The material conveying system includes a first sample conveyor, one end of which is located below the high-intensity mixer, and the other end is located below the mixing hopper.

6. The closed-loop control system for the chemical composition of secondary material mixing in the LIBS-based secondary material yard according to claim 1, characterized in that, The material conveying system includes a second sample conveyor, which is connected to the outlet of the LIBS testing device.

7. The closed-loop control system for the chemical composition of secondary material mixing in the LIBS-based secondary material yard according to claim 1, characterized in that, The waste disposal system includes a waste collection hopper, which is located below the mixing hopper and below the outlet of the LIBS detection device.

8. The closed-loop control system for the chemical composition of secondary material mixing in the LIBS-based secondary material yard according to claim 1, characterized in that, The material conveying system includes a main waste conveyor belt, one end of which is located below the waste collection hopper, and the other end is located on one side of the bucket elevator.

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