Method for on-line measurement of coal quality characteristics based on partial least squares method

A partial least squares and partial least squares technology, applied in the field of coal quality characteristics measurement, can solve problems such as insufficient robustness, poor nonlinear fitting ability, and poor fault tolerance ability.
CN102053083AActive Publication Date: 2011-05-11TSINGHUA UNIV
2 Cites 34 Cited by

Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2011-05-11

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a method for on-line measurement of coal quality characteristics based on partial least squares method. Firstly, the coal calibration samples containing known components are detected by use of an laser-induced breakdown spectroscopy (LIBS) system, the calibration samples are classified by the principal component analysis (PCA) or partial least squares-discriminant analysis (PLS-DA) method according to the obtained spectral line intensity matrix, and PLS regression equations of the individual classes of the calibration samples are established respectively; and then a sample to be tested is detected on line to obtain an LIBS spectrum, the type of the sample to be tested is judged by the PCA or PLS-DA method, and the spectral line intensity matrix of the LIBS spectrum is put into the PLS regression equation of the corresponding type to calculate the mass concentrations of individual elements in the sample to be tested. The method fully utilizes the effective information of the LIBS spectrum, eliminates the multiple correlation of spectral line intensity caused by the mutual interference of the elements, reduces the influence of the matrix effect, and is characterized by high goodness of fit, strong reproducibility and high prediction accuracy in comparison with the single-variable calibration method in the prior art.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a method for measuring coal quality characteristics. Specifically, the basic principle of the method is Laser-Induced Plasma Spectroscopy (LIBS for short). Partial least squares (PLS) was used to quantitatively analyze the coal composition. Background technique

[0002] In coal-using units such as coal mines, coal plants and power plants, real-time adjustment of working parameters according to different coal quality components is conducive to improving combustion efficiency, saving energy and reducing pollutant emissions. However, the traditional coal quality analysis methods mostly use off-line analysis, which has the disadvantages of poor sampling and sample preparation, slow analysis speed, and cumbersome procedures. Therefore, each coal-using unit is in urgent need of an online rapid detection method for coal quality with high precision and full elemental analysis.

[0003] At present, the commonly used technologies in t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More