thermal coal macerals

(PDF) EPR Study of Thermally Decomposed Coal and
The thermal decomposition of Polish medium-rank coal with 85.6 wt% C and its macerals: exinite, vitrinite and inertinite, obtained from lithotypes: durain, vitrain and clarain was. investigated by ...
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(PDF) Thermally Excited Multiplet States in Coal Macerals
The measurements of line intensity for macerals: exinite, vitrinite and inertinite, separated from bituminous coal (85.6 wt% C), were carried out in the temperature range 100-300 K.
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Paramagnetic Centers in Thermally Decomposed Coal and
The influence of thermal decomposition at 300-650 oC on the paramagnetic centers system of Polish medium-rank coal, its macerals (exinite, vitrinite and
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Macerals, Coal, Kentucky Geological Survey,
2019-9-19 · Macerals are the altered remains and byproducts of the original plant material from which the coal-forming peat originated. Macerals are to coal as sediment grains and cements are to sedimentary rocks. Coal petrographers
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Coal Macerals - an overview | ScienceDirect Topics
Coal macerals have different colors and fluorescence intensities and can be identified under the microscope. Coal petrography is the study of the organic constituents of sedimentary rocks, originally, by optical microscopy of thin sections (transmitted light) or of polished blocks (reflected light) [Unsworth et al., 1991].Fluorescence microscopy is used to complement the more
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(PDF) EPR Analysis of Coal Macerals - ResearchGate
Evolution of paramagnetic centres of Polish medium-rank coal (85.6 wt% C), its macerals: exinite, vitrinite and inertinite, and petrographically complex samples during thermal decomposition at
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Coal macerals separation by reflux classification and ...
2013-1-1 · Highlights • Coal macerals were successfully separated by the reflux classifier. • Macerals swelling and thermal properties were synchronously measured. • 400–600 °C, vitrinite shows larger swelling and more exothermic than inertinite.• Inertinite suppresses swelling but not significantly influences contraction.
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Associations of physical, chemical with thermal changes ...
2015-5-1 · Physical, chemical and thermal events of heating coal macerals were synchronized. • Thermo-expansion of coal used up to 21% of the volatiles to drive bubble growth. • Vitrinite content affected the swelling temperature region and gas diffusion. • Onset of tar evolution was identified as the lowest temperature event as coking. •
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Flash pyrolysis of coal, coal maceral, and coal-derived ...
A Pyroprobe flash pyrolysis-gas chromatograph equipped with a flame photometric detector was used to study volatile sulfur compounds produced during the thermal decomposition of Illinois coal, coal macerals and coal-derived pyrite. Maximum evolution of volatile organic sulfur compounds from all coal samples occurred at a temperature of approximately 700??C.
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Coal Geology and Resources - UNESCO
2020-8-18 · macerals Contents 1. Introduction to the Coal Geology and the Stages of Coal Development 2. Accumulation Phase - Review of Coal-forming Environments ... generation and thermal maturation of coal and its overall quality as a fuel, its potential to generate and store hydrocarbons (such as methane), and the factors that control the ...
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(PDF) Thermal decomposition of macerals of coals during
Thermochemical transformations of coal... | Find, read and cite all the research you need on ResearchGate Article PDF Available Thermal decomposition of macerals of coals during coking
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Paramagnetic Centers in Thermally Decomposed Coal and
The influence of thermal decomposition at 300-650 oC on the paramagnetic centers system of Polish medium-rank coal, its macerals (exinite, vitrinite and
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(PDF) Evolution of paramagnetic centres during thermal ...
The changes in the amount and behaviour of different groups of paramagnetic centres during thermal decomposition of Polish medium-rank coal (85.6 wt%
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Coal macerals separation by reflux classification and ...
2013-1-1 · Highlights • Coal macerals were successfully separated by the reflux classifier. • Macerals swelling and thermal properties were synchronously measured. • 400–600 °C, vitrinite shows larger swelling and more exothermic than inertinite.• Inertinite suppresses swelling but not significantly influences contraction.
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Macerals, Coal, Kentucky Geological Survey, University of ...
2019-9-19 · Macerals are the altered remains and byproducts of the original plant material from which the coal-forming peat originated. Macerals are to coal as sediment grains and cements are to sedimentary rocks. Coal petrographers
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Flash pyrolysis of coal, coal maceral, and coal-derived ...
A Pyroprobe flash pyrolysis-gas chromatograph equipped with a flame photometric detector was used to study volatile sulfur compounds produced during the thermal decomposition of Illinois coal, coal macerals and coal-derived pyrite. Maximum evolution of volatile organic sulfur compounds from all coal samples occurred at a temperature of approximately 700??C.
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Physicochemical, mineralogy, and thermo-kinetic ...
2021-1-3 · Thermal analysis revealed significant mass loss (M L) due to thermal degradation of coal macerals during oxidative and non-oxidative TGA. Kinetic analysis showed that the coal samples are highly reactive with low E a and k o values under both oxidative and non-oxidative conditions. Hence, the coal samples are suitable for coal-fired electricity ...
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COAL CHARACTERISTICS - Purdue University
2016-12-8 · organic debris, called macerals, from which the coal is formed. Macerals (microscopic organic constituents found in coal) are identified (microscopically) by ... stored in a coal that is released as thermal energy upon combustion. It is directly
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Characteristics of Pore Evolution and Its Maceral ...
2021-3-10 · The pore evolution history varies with different types of macerals. The pore characteristics of the Huolinhe lignite of the Erlian Basin were examined under laboratory thermal maturation conditions to study the correlation of coal rank and macerals on pore evolution. Mercury intrusion porosimetry, low-pressure CO2 adsorption, light microscopy, and scanning
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TG-DSC测定煤热解反应热过程中确定基线热流的技术方法
2021-11-2 · Rohan S,Wei Xie,Terry W,et al.Dynamic measurement of coal macerals during pyrolysis-associations between physical,thermal and chemical changes[J].Proceedings of the Combustion Institute,2013,34(2):2393-2400. [10]
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Electron paramagnetic resonance studies of coal macerals ...
1998-1-1 · Influence of microwave frequency and thermal decomposition} author = {Pilawa, B, Wieckowski, A B, Lewandowski, M, and Nassalski, G} abstractNote = {Coal macerals: Exinite, vitrinite and inertinite, from Polish middle metamorphosed coal with 85.6%C, were investigated by electron paramagnetic resonance (ESR/EPR) method at X-band (9.3 GHz) and at ...
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Evaluation of changes in macerals and geochemical ...
2015-5-20 · In this study, we adopted thermal simulation to explore the changes of macerals compositions and trace elements in the coal oil processing. Using lignite for the thermal simulation, the changes of various parameters and trace elements in the thermal evolution were explored. The experimental results showed that the content of vitrinite decreased gradually
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ADGEO - Nanoindentation study of macerals in
Vitrinite reflectance (VR), indicative for the thermal maturity of the whole coal sample, was adopted from Sachsenhofer et al. (2003). Inertinite reflectance values (IR) of investigated inertinite macerals were measured during this study
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Flash pyrolysis of coal, coal maceral, and coal-derived ...
A Pyroprobe flash pyrolysis-gas chromatograph equipped with a flame photometric detector was used to study volatile sulfur compounds produced during the thermal decomposition of Illinois coal, coal macerals and coal-derived pyrite. Maximum evolution of volatile organic sulfur compounds from all coal samples occurred at a temperature of approximately 700??C.
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COAL CHARACTERISTICS - Purdue University
2016-12-8 · organic debris, called macerals, from which the coal is formed. Macerals (microscopic organic constituents found in coal) are identified (microscopically) by ... stored in a coal that is released as thermal energy upon combustion. It is directly
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Physicochemical, mineralogy, and thermo-kinetic ...
2021-1-3 · Thermal analysis revealed significant mass loss (M L) due to thermal degradation of coal macerals during oxidative and non-oxidative TGA. Kinetic analysis showed that the coal samples are highly reactive with low E a and k o values under both oxidative and non-oxidative conditions. Hence, the coal samples are suitable for coal-fired electricity ...
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Characterization of Coal by Thermal Analysis Methods
2016-6-27 · Coal is a very heterogeneous material composed of both organic and inorganic substances. The organic contents called coal macerals are the desired portion of the coal. The inorganic contents called mineral matters are unwanted components that dilute the coal and provide a means for pollution that are undesirable. Coals can be
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Coal Macerals Response to Coal Liquefying Activity Based ...
Coal liquefaction is the available, adoptable method of relieving the energy crisis from crude oil supply in large scale. The coal type and react activity are hot research. In this paper, From the SPSS (Statistical Product and Service Solutions) data correlation analysis and hierarchical clustering graph about the macerals respond to coal liquefaction yield, all the correlation
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Vitrinite Reflectance, Thermal Maturity and Coal Rank in ...
2019-11-13 · Vitrinite Reflectance, Thermal Maturity and Coal Rank in Lower Cretaceous Medicine River Coals of South Central Alberta: Reflectance Suppression and the Role of Liptinite Macerals in Hydrocarbon Generation - Implications for CBM Exploration. Judith Potter* JP Petrographics, Calgary, AB jpp@sitogeo and
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TG-DSC测定煤热解反应热过程中确定基线热流的技术方法
2021-11-2 · Rohan S,Wei Xie,Terry W,et al.Dynamic measurement of coal macerals during pyrolysis-associations between physical,thermal and chemical changes[J].Proceedings of the Combustion Institute,2013,34(2):2393-2400. [10]
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