To rapidly and accurately determine the viscosity-temperature characteristics of coal is of great significance for gasifier operation.This is usually achieved by the method of measuring the temperature of critical viscosity of coal ash.The combination of laser induced breakdown spectroscopy(LIBS)and chemometrics methods has many unique advantages in coal analysis.The study collects 41 representative coal samples,based on which the corresponding temperature of critical viscosity of coal ash has been determined by DL/T 660-2007 standard method.Based on correlation between the laser induced breakdown spectra of coal sample and the temperature of critical viscosity,three LIBS calibration models for predicting the temperature of critical viscosity are built by chemometrics methods.The cross validation results of the models show good consistency between LIBS method and standard laboratory method.The standard error in prediction of temperature of critical viscosity from the calibration models established by partial least squares regression(PLSR),artificial neural network(ANN),and support vector machine regression(SVR)is 63,57,and 56 ℃,respectively,and the measurement time for each coal sample is less than 5 minutes,thus meeting the needs of rapid onsite analysis for industry.
laser induced breakdown spectroscopycoalchemometricstemperature of critical viscosityviscosity-temperature characteristics
万方数据
维普
