Study of the correlation between the coal calorific value and coal ash content using X-ray fluorescence analysis

2013 ◽  
Vol 10 (7) ◽  
pp. 723-726 ◽  
Author(s):  
D. Bolortuya ◽  
P. Zuzaan ◽  
M. V. Gustova ◽  
O. D. Maslov
Keyword(s):  
Coal Ash ◽  
Calorific Value ◽  
Fluorescence Analysis ◽  
Ash Content ◽  
X Ray

scholarly journals DETERMINATION OF ASH CONTENT IN COAL BY X-RAY FLUORESCENCE ANALYSIS Authors D Baimolda

2021 ◽  
Vol 73 (1) ◽  
pp. 82-84
Author(s):  
D. Baimolda ◽  
◽  
T. Cechak ◽  
Sh. Shyngysova ◽  
◽  
...  
Keyword(s):  
Nuclear Physics ◽  
Coal Ash ◽  
Fluorescence Analysis ◽  
Ash Content ◽  
Environmental Damage ◽  
Coal Quality ◽  
X Ray ◽  
Burning Coal

This article discusses the advantages of X-ray fluorescence analysis (XRF) techniques for the determination of ash in coal. The quality of coal depends on the amount of ash contained in it. On the other hand, ash causes irreversible environmental damage when using coal as a source of energy. Since coal is considered as the most important source of energy, coal quality is directly related to ash, which correlates with its non-combustible minerals and elements. Some elements such as S (sulfur), Ti (titanium), Ca (calcium), Fe (iron) after burning coal can have an adverse impact on the environment. Thus, we have demonstrated in this study how we can determine the ash content consisting of noncombustible minerals in the composition of coal and, thus, assess the quality of coal using X-ray fluorescence research. It also describes how we can determine coal ash samples using the XRF analyzer 123-1 in online, which is one of the most optimal methods in nuclear physics.

scholarly journals Coal Ash Content Measurement Based on Pseudo-Dual Energy X-ray Transmission

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1433
Author(s):  
Xiufeng Zhang ◽  
Long Liang ◽  
Taiyou Li ◽  
Jiakun Tan ◽  
Xingguo Liang ◽  
...  
Keyword(s):  
Real Time ◽  
Coal Ash ◽  
Absolute Error ◽  
Dual Energy ◽  
Ash Content ◽  
X Ray ◽  
Content Measurement ◽  
Filter Tube ◽  
The Absolute ◽  
Wave Filter

The real-time ash content measurement is the fundamental condition for the timely adjustment and intelligent control of operation parameters in coal production and utilization industry. In the present work, a real-time ash content analyzer based on the pseudo-dual energy X-ray transmission was developed. The feasibility of this X-ray ash content analyzer was validated by the linear relationship between ash content and five characteristic parameters of X-ray. The conditions of wave filter, tube voltage, and tube current were optimized. The comparison between the ash contents measured by muffle furnace and the X-ray ash content analyzer was conducted in laboratory and industry. It was found that the absolute error was smaller than 1% for clean coal with ash content of approximately 10%, and the possibility of the absolute error smaller than 0.5% was higher than 85%.

Application of the Fundamental Parameters Model to Energy-Dispersive X-Ray Fluorescence Analysis of Complex Silicates

1979 ◽  
Vol 23 ◽  
pp. 71-76
Author(s):  
Peggy Dalheim
Keyword(s):  
Coal Ash ◽  
Fluorescence Analysis ◽  
Energy Dispersive ◽  
Calibration Constant ◽  
Empirical Methods ◽  
X Ray ◽  
Fundamental Parameters ◽  
Ideal Approach ◽  
Geologic Samples ◽  
Complicated Task

The elemental analysis of geologic samples such as rocks, minerals and coal ash is a complicated task because of their wide, complex compositional range. Energy dispersive x-ray fluorescence (EDXRF) can provide a rapid, accurate and precise way of analyzing geologic samples. Two approaches to reducing EDXRF intensity data to elemental concentrations are the empirical approach and the fundamental parameters (theoretical) approach. Empirical methods require numerous standards within restricted compositional ranges so can become complex, time consuming and, therefore, expensive if diverse suites of samples are to be analyzed for many elements. Fundamental parameters, on the other hand, requires knowledge of physical constants such as mass absorption coefficients, jump ratios and fluorescent yields, and only one matrix independent standard to calculate a calibration constant for each element making it an ideal approach to the analysis of diverse geologic samples.

scholarly journals Investigation on characterization and liquefaction of coals from Tavan tolgoi deposit

2014 ◽  
Vol 14 ◽  
pp. 12-19
Author(s):  
B Purevsuren ◽  
S Jargalmaa ◽  
B Bat-Ulzil ◽  
B Avid ◽  
T Gerelmaa
Keyword(s):  
Maximum Yield ◽  
Liquid Product ◽  
Coal Ash ◽  
Fluorescence Analysis ◽  
Constant Mass ◽  
Mass Ratio ◽  
X Ray ◽  
Thermal Dissolution ◽  
Ir Analysis ◽  
Coal Organic Matter

On the basis of proximate, ultimate, petrographic and IR analysis results have been confirmed that the Tavan tolgoi coal is a high-rank G mark stone coal. The results of X-ray fluorescence analysis of coal ash show that the Tavan tolgoi coal is a subbituminous coal. The ash of Tavan tolgoi coal has an acidic character. The results of pyrolysis of Tavan tolgoi coal at different heating temperatures show that a maximum yield - 5.0% of liquid product can be obtained at 700°C. The results of thermal dissolution of Tavan tolgoi coal in tetralin with constant mass ratio between coal and tetralin (1:1.8) at 450°C show that 50.0% of liquid product can be obtained after thermal decomposition of the COM (coal organic matter). DOI: http://dx.doi.org/10.5564/mjc.v14i0.191 Mongolian Journal of Chemistry 14 (40), 2013, p12-19

Determination of coal ash content by the combined x-ray fluorescence and scattering spectrum

2018 ◽  
Vol 89 (2) ◽  
pp. 023103 ◽  
Author(s):  
I. F. Mikhailov ◽  
A. A. Baturin ◽  
A. I. Mikhailov ◽  
S. S. Borisova ◽  
L. P. Fomina
Keyword(s):  
Coal Ash ◽  
Ash Content ◽  
X Ray ◽  
Scattering Spectrum

A discussion on advanced methods of energy conversion- Magnetohydrodynamic power generation - Some aspects of the chemistry of m. h. d. seed

1967 ◽  
Vol 261 (1123) ◽  
pp. 541-557 ◽  
Keyword(s):  
Flue Gas ◽  
Coal Ash ◽  
Calorific Value ◽  
Ash Content ◽  
Potassium Sulphate ◽  
Saturated Vapour Pressure ◽  
Saturated Vapour ◽  
Sulphur Trioxide ◽  
Oil Fuel ◽  
Reducing Gases

The paper reports information assembled from the literature and from experiments about the physical chemistry of potassium sulphate at high temperatures and this enables a first assessment to be made of the difficulty of evaporating it quickly in an m.h.d. combustion chamber and recovering if after it leaves the generator duct. Measurements of the evaporation rate show that in oxidizing and neutral gases a 50 /x m diameter particle, which could be produced by normal powdering methods, should be evaporated within 10 to 20 ms at 2800 °K and this agrees with calculations. The experiments suggest that evaporation should be much faster in reducing gases. Available thermodynamic data has been used to determine the amount of heat used in evaporation of the seed. It amounts to 6-9 % of the calorific value of oil fuel—allowing for seed impurities. A flue gas containing 0-7 at. % of potassium should begin to condense at 1600 K and the amount of liquid, solid, or smoke formed will depend on the rate of removal of heat from the flue gas and on the saturated vapour pressure of K 2 SO 4 . Accurate data for the latter determined by effusion and transpiration methods are reported. Potassium sulphate reaching metal tubes in the boiler and superheater may form liquids with excess of sulphur trioxide (including pyrosulphates, melting at about 670 °K) in the temperature range 670 to 970 °K. This could cause more severe corrosion than when potassium is absent. Measurements of the partial pressure of potassium sulphate in equilibrium with coal ash slags up to 2000 °K suggest that it should be possible to reject the slag without loss of potassium if it could be separated from the potassium containing gas at 2000 to 2100 °K according to the ash content of the coal.

Determination of Sulfur, Ash, and trace Element Content of Coal, Coke, and Fly Using Multielement Tube-Excied X-ray Fluorescence Analsis

1976 ◽  
Vol 20 ◽  
pp. 431-436
Author(s):  
J. A. Cooper ◽  
B. D. Wheeler ◽  
G. J. Wolfe ◽  
D. M. Bartell ◽  
D. B. Schlafke
Keyword(s):  
Trace Elements ◽  
Fly Ash ◽  
Trace Element ◽  
Trace Element Content ◽  
Fluorescence Analysis ◽  
Major And Trace Elements ◽  
Average Concentration ◽  
Ash Content ◽  
X Ray

A procedure using tube excited energy dispersive x-ray fluorescence analysis with interelement corrections has been developed for multielement analysis of major and trace elements and ash content of coal, coke, and fly ash. The procedure uses pressed pellets and an exponential correction for interelement effects. The average deviations ranged from about 0.0003% for V at an average concentration of about .003% to 0.1% for S at an average concentration of 4%. About 25 elements were measured and 100 second minimum detectable concentrations ranged from about one part per million for elements near arsenic to about one tenth of one percent for sodium.

Determination of the ash content of coal by multi-element x-ray fluorescence analysis

1984 ◽  
Vol 13 (4) ◽  
pp. 151-152
Author(s):  
Bohdan Dziunikowski ◽  
Aleksander Stochalski
Keyword(s):  
Fluorescence Analysis ◽  
Ash Content ◽  
X Ray

An x-ray microprobe based upon a close-coupled focal-spot / glass capillary arrangement

1992 ◽  
Vol 50 (2) ◽  
pp. 1758-1759
Author(s):  
D. A. Carpenter ◽  
M. A. Taylor
Keyword(s):  
Imaging Techniques ◽  
Fluorescence Analysis ◽  
High Sensitivity ◽  
Specimen Preparation ◽  
X Rays ◽  
Glass Capillary ◽  
Close Coupling ◽  
X Ray ◽  
Point To Point ◽  
Beam Damage

The development of intense sources of x rays has led to renewed interest in the use of microbeams of x rays in x-ray fluorescence analysis. Sparks pointed out that the use of x rays as a probe offered the advantages of high sensitivity, low detection limits, low beam damage, and large penetration depths with minimal specimen preparation or perturbation. In addition, the option of air operation provided special advantages for examination of hydrated systems or for nondestructive microanalysis of large specimens.The disadvantages of synchrotron sources prompted the development of laboratory-based instrumentation with various schemes to maximize the beam flux while maintaining small point-to-point resolution. Nichols and Ryon developed a microprobe using a rotating anode source and a modified microdiffractometer. Cross and Wherry showed that by close-coupling the x-ray source, specimen, and detector, good intensities could be obtained for beam sizes between 30 and 100μm. More importantly, both groups combined specimen scanning with modern imaging techniques for rapid element mapping.

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