基于CNN−BP的浮选尾煤灰分智能检测方法

韩宇, 王兰豪, 刘秦杉, 桂夏辉

韩宇,王兰豪,刘秦杉,等. 基于CNN−BP的浮选尾煤灰分智能检测方法[J]. 工矿自动化,2023,49(3):100-106. DOI: 10.13272/j.issn.1671-251x.2022100019
引用本文: 韩宇,王兰豪,刘秦杉,等. 基于CNN−BP的浮选尾煤灰分智能检测方法[J]. 工矿自动化,2023,49(3):100-106. DOI: 10.13272/j.issn.1671-251x.2022100019
HAN Yu, WANG Lanhao, LIU Qinshan, et al. Intelligent detection model of flotation tailings ash based on CNN-BP[J]. Journal of Mine Automation,2023,49(3):100-106. DOI: 10.13272/j.issn.1671-251x.2022100019
Citation: HAN Yu, WANG Lanhao, LIU Qinshan, et al. Intelligent detection model of flotation tailings ash based on CNN-BP[J]. Journal of Mine Automation,2023,49(3):100-106. DOI: 10.13272/j.issn.1671-251x.2022100019

基于CNN−BP的浮选尾煤灰分智能检测方法

基金项目: 国家重点研发计划项目(2021YFC2902600)。
详细信息
    作者简介:

    韩宇(1997—),男,山西吕梁人,硕士研究生,研究方向为选煤/选矿与智能化控制,E-mail: hanyu19970804@163.com

    通讯作者:

    王兰豪(1989—),男,河南商丘人,副教授,主要从事选煤/选矿技术研究及工程应用等工作,E-mail: wanglanhao888@163.com

  • 中图分类号: TD948

Intelligent detection model of flotation tailings ash based on CNN-BP

  • 摘要: 尾煤灰分是浮选系统的重要生产指标,不仅可以反映当前浮选系统运行工况和精煤采出率,对浮选智能化控制也有重要意义。针对现有基于图像的浮选尾煤灰分检测方法特征提取不全面、模型精度不足的问题,提出了一种基于卷积神经网络(CNN)−反向传播(BP)的浮选尾煤灰分智能检测方法。构建了CNN初步预测与BP神经网络补偿预测相结合的浮选尾煤灰分智能检测模型。通过CNN提取矿浆图像特征数据,初步预测尾煤灰分,然后将图像灰度特征数据和彩色特征数据作为BP补偿模型的输入,以初步预测值与真实值的差值为输出,最终将初步预测值与补偿预测值相加,得到浮选尾煤灰分。实验结果表明:磁力搅拌器的转子为小转子、转速为500 r/min、光照强度为12 750 Lux条件下矿浆搅拌充分,图像质量最好;与CNN模型及极限学习机(ELM)模型相比,CNN−BP模型预测精度最高,误差波动范围最小,预测误差范围为−2%~+2%;CNN−BP模型的均方根误差(RMSE)为0.770 5,决定系数为0.997 4,平均绝对误差(MAE)为0.557 2%,表明其精度高、效果好、泛化性强,可以满足现场生产检测要求。
    Abstract: The tailings ash is an important production index of flotation systems. It not only reflects the current operating conditions of flotation system and clean coal recovery, but also has important significance for intelligent flotation control. The existing image-based detection method of flotation tailings ash has the problems of incomplete feature extraction and insufficient model precision. In order to solve the above problems, an intelligent detection method of flotation tailings ash based on convolutional neural network (CNN) - back propagation (BP) is proposed. An intelligent detection model of flotation tailings ash is constructed by combining CNN preliminary prediction and BP neural network compensation prediction. The pulp image feature data is extracted through CNN to preliminarily predict the tailings ash. The image gray feature data and color feature data are used as input to the BP compensation model. The difference between the preliminary prediction value and the actual value is used as output. Finally, the preliminary prediction value and the compensation prediction value are added to obtain the flotation tailings ash. The experimental results show that when the rotor of the magnetic stirrer is small, the rotation speed is 500 r/min, and the light intensity is 12 750 Lux, the pulp is fully stirred, and the image quality is the best. Compared with the CNN model and extreme learning machine (ELM) model, the CNN-BP model has the highest prediction precision, the smallest error fluctuation range. The prediction error is within the range of −2% to +2%. The root mean square error (RMSE) of the CNN-BP model is 0.7705, the determination coefficient is 0.9974, and the mean absolute error (MAE) is 0.5572%. This indicates that its high precision, good effect and strong generalization can meet the requirements of on-site production testing.
  • 图  1   煤泥浮选原理

    Figure  1.   Principle of slime flotation

    图  2   煤泥浮选工艺流程

    Figure  2.   Process of slime flotation

    图  3   卷积运算过程

    Figure  3.   Process of convolution operation

    图  4   池化运算过程

    Figure  4.   Process of pooling operation

    图  5   基于CNN−BP的浮选尾煤灰分智能检测模型

    Figure  5.   Intelligent detection model of flotation tailings ash based on CNN-BP

    图  6   CNN结构

    Figure  6.   Structure of CNN

    图  7   实验装置

    Figure  7.   Experimental device

    图  8   预处理后的部分矿浆图像

    Figure  8.   Partial pulp images after pretreatment

    图  9   不同模型灰分预测结果

    Figure  9.   Ash prediction results of different models

    图  10   不同模型灰分预测误差

    Figure  10.   Ash prediction error of different models

    表  1   不同光照强度下图像灰度均值差

    Table  1   Image gray mean difference under different light intensity

    光照强度/Lux灰度均值差光照强度/Lux灰度均值差
    9 00010.55 12 750209.84
    9 75014.3813 500206.42
    10 50045.2214 250200.65
    11 250135.1515 000195.70
    12 000178.12
    下载: 导出CSV

    表  2   CNN训练参数

    Table  2   CNN training parameters

    参数设定值
    优化算法sgdm
    基础学习率0.0001
    学习率变化期数20
    学习率变化指数0.1
    验证迭代次数30
    单位批量次数4
    训练设备GPU
    下载: 导出CSV

    表  3   模型预测结果评价

    Table  3   Evaluation of model prediction results

    模型MAE/%RMSER2
    ELM1.495 91.783 20.984 3
    CNN0.959 01.201 00.993 8
    CNN−BP0.557 20.770 50.997 4
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-10-10
  • 修回日期:  2023-03-05
  • 网络出版日期:  2023-03-26
  • 刊出日期:  2023-03-24

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