Development of a Rapid Coal Analyzer Using Laser-Induced Breakdown Spectroscopy (LIBS)

2018 ◽  
Vol 72 (8) ◽  
pp. 1225-1233 ◽  
Author(s):  
Shunchun Yao ◽  
Juehui Mo ◽  
Jingbo Zhao ◽  
Yuesheng Li ◽  
Xiang Zhang ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Power Plants ◽  
Calorific Value ◽  
Utilization Efficiency ◽  
Quality Analysis ◽  
Laser Induced Breakdown Spectroscopy ◽  
Accurate Analysis ◽  
Coal Quality ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Determination of coal quality plays a major role in coal-fired power plants and coal producers for optimizing the utilization efficiency and controlling the quality. In this work, a rapid coal analyzer based on laser-induced breakdown spectroscopy (LIBS) was developed for rapid quality analysis of pulverized coal. The structure of the LIBS apparatus was introduced in detail. To avoid time-consuming and complicated sample preparation, a pulverized feeding machine was designed to form a continuously stable coal particle flow. The standard deviation (SD) of characteristic peaks was used to estimate the spectral valid data in this experiment. Coupled with cluster analysis, artificial neural networks and genetic algorithm are employed as a nonlinear regression method in order to indicate the relationship between coal quality and the corresponding plasma spectra. It is shown that the average absolute error of ash, volatile matter, fixed carbon, and gross calorific value for the validation set is 0.82%, 0.85%, 0.96%, and 0.48 MJ/kg. The average standard deviation of repeated samples is 1.64%, 0.92%, 1.08%, and 0.86 MJ/kg, showing a high sample-to-sample repeatability. This rapid coal analyzer is capable of performing reliable and accurate analysis of coal quality.

Design of a Laser-Induced Breakdown Spectroscopy System for On-Line Quality Analysis of Pulverized Coal in Power Plants

2009 ◽  
Vol 63 (8) ◽  
pp. 865-872 ◽  
Author(s):  
Wangbao Yin ◽  
Lei Zhang ◽  
Lei Dong ◽  
Weiguang Ma ◽  
Suotang Jia
Keyword(s):  
Sample Preparation ◽  
Measurement Errors ◽  
Power Plants ◽  
Pulverized Coal ◽  
Quality Analysis ◽  
Laser Induced Breakdown Spectroscopy ◽  
Gas Cleaning ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
On Line

It is vitally important for a power plant to determine the chemical composition of coal prior to combustion in order to obtain optimal boiler control. In this work, a fully software-controlled laser-induced breakdown spectroscopy (LIBS) system comprising a LIBS apparatus and sampling equipment has been designed for possible application to power plants for on-line quality analysis of pulverized coal. Special attention was given to the LIBS system, the data processing methods (especially the normalization with Bode Rule/DC Level) and the specific settings (the software-controlled triggering source, high-pressure gas cleaning device, sample-preparation module, sampling module, etc.), which gave the best direct measurement for C, H, Si, Na, Mg, Fe, Al, and Ti with measurement errors less than 10% for pulverized coal. Therefore, the apparatus is accurate enough to be applied to industries for on-line monitoring of pulverized coal. The method of proximate analysis was also introduced and the experimental error of Aad (Ash, ‘ad’ is an abbreviation for ‘air dried’) was shown in the range of 2.29 to 13.47%. The programmable logic controller (PLC) controlled on-line coal sampling equipment, which is designed based upon aerodynamics, and is capable of performing multipoint sampling and sample-preparation operation.

Cement raw material quality analysis using laser-induced breakdown spectroscopy

2016 ◽  
Vol 31 (12) ◽  
pp. 2384-2390 ◽  
Author(s):  
Hualiang Yin ◽  
Zongyu Hou ◽  
Lei Zhang ◽  
Xiangjie Zhang ◽  
Zhe Wang ◽  
...  
Keyword(s):  
Raw Material ◽  
Quality Analysis ◽  
Laser Induced Breakdown Spectroscopy ◽  
Standardization Method ◽  
Material Quality ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Cement Raw Material

The capability of LIBS analysis of the cement raw material is improved by using a new spectrum standardization method.

Determination of Copper in A533b Steel for the Assessment of Radiation Embrittlement Using Laser-Induced Breakdown Spectroscopy

1996 ◽  
Vol 50 (3) ◽  
pp. 306-309 ◽  
Author(s):  
Wolfgang E. Ernst ◽  
Dave F. Farson ◽  
D. Jason Sames
Keyword(s):  
Laser Beam ◽  
Fiber Optics ◽  
Nuclear Power ◽  
Power Plants ◽  
Pressure Vessels ◽  
Laser Induced Breakdown Spectroscopy ◽  
Radiation Embrittlement ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Determination of radiation embrittlement in nuclear reactor pressure vessels is crucial to assessing safe operative lifetimes for many aging nuclear power plants. Conservative nuclear fluence estimates and trace impurity diagnosis of the weldment material are the basis of radiation embrittlement analysis. Copper is thought to be a key impurity contributing to radiation embrittlement. In this paper, the application of laser-induced breakdown spectroscopy (LIBS) as a means to assess radiation embrittlement by the detection and quantification of copper in A553b steel was investigated. A LIBS configuration completely coupled by fiber optics was attempted, but because of low laser power and fiber losses, fiber-optic delivery of the laser beam was unsuccessful. Consequently, hard optics (lenses and mirrors) were employed for laser beam delivery. The plasma emission was delivered successfully via fiber optics to the detection apparatus. Copper measurements were made from custom-fabricated steel samples. Comparison of the LIBS results to an independent atomic absorption spectrophotometry (AAS) analysis showed LIBS to be of comparable accuracy, especially in low-level copper samples.

Analysis of relative standard deviation of spectral line intensity and intensity ratio in laser-induced breakdown spectroscopy using CuIn1−xGaxSe2 thin film samples

2015 ◽  
Vol 30 (10) ◽  
pp. 2107-2119 ◽  
Author(s):  
Jung-Hwan In ◽  
Chan-Kyu Kim ◽  
Sungho Jeong
Keyword(s):  
Thin Film ◽  
Standard Deviation ◽  
Spectral Line ◽  
Line Intensity ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spectral Line Intensity ◽  
Breakdown Spectroscopy ◽  
Relative Standard ◽  
Laser Induced Breakdown ◽  
Fluctuation Noise

The precision of laser induced breakdown spectroscopy (LIBS) measurement is analyzed in consideration of both the shot noise of the detector and the shot-to-shot fluctuation noise of the laser plasma.

Identifying laser-induced plasma emission spectra of particles in a gas–solid flow based on the standard deviation of intensity across an emission line

2018 ◽  
Vol 33 (10) ◽  
pp. 1676-1682 ◽  
Author(s):  
Shunchun Yao ◽  
Lifeng Zhang ◽  
Kejing Yin ◽  
Kaijie Bai ◽  
Jialong Xu ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Emission Spectra ◽  
Laser Induced Breakdown Spectroscopy ◽  
Plasma Emission ◽  
Solid Flow ◽  
Laser Induced Plasma ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Line P ◽  
Deviation Method

A scheme named the standard deviation method is presented for identifying the spectral data of a gas–solid flow based on laser-induced breakdown spectroscopy.

Laser-Induced Breakdown Spectroscopy for Quantitative and Qualitative Analysis on Ash Fusion Temperatures of Coal in Power Plant

2021 ◽  
Author(s):  
Wenhao Zhang ◽  
Zhuang Zhuo ◽  
Peng Lu ◽  
Jingqi Lu ◽  
Tengfei Sun ◽  
...  
Keyword(s):  
Power Plant ◽  
Traditional Method ◽  
Power Plants ◽  
Thermal Power ◽  
Laser Induced Breakdown Spectroscopy ◽  
Thermal Power Plants ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Long Time

The prediction of coal fusion characteristics and determination of slagging behaviour are of great significance to the operation of thermal power plants. The traditional method needs a long time to...

Sign in / Sign up

Export Citation Format

Share Document