Evaluation of thermokinetics methodology, parameters, and coke characterization of co-pyrolysis of bituminous coal with herbaceous and agricultural biomass

ABSTRACTX-ray powder diffraction has been used to determine the crystalline phase mineralogy in samples of fly ash from each of the lignite mining areas of North America. The characteristic phases of North Dakota lignite fly ashes were periclase, lime, merwinite and the sulfate phases anhydrite, thenardite and a sodalite-structure phase. Mullite was absent in these low-Al2O3 ashes. Montana lignite ash mineralogy had characteristics of ND lignite and MT subbituminous coal fly ashes; mullite and C3A were present and the alkali sulfates were absent. Texas and Louisiana lignite fly ashes had the characteristic mineralogy of bituminous coal fly ash: quartz, mullite, ferrite-spinel (magnetite) and minor hematite. Even though their analytical CaO contents were 7–14%, all but one lacked crystalline CaO-containing phases. Lignite fly ashes from Saskatchewan were generally the least crystalline of those studied and had a mineralogy consisting of quartz, mullite, ferrite spinel and periclase. Quantitative XRD data were obtained. The position of the diffuse scattering maximum in the x-ray diffractograms was indicative of the glass composition of the lignite fly ash.

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98/02126 Pyrolysis of degradation products from bituminous coal and characterization of tars and coke in view of parent coal structure and pyrolysis behavior

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(98)80317-2 ◽

1998 ◽

Vol 39 (3) ◽

pp. 192

Keyword(s):

Bituminous Coal ◽

Degradation Products ◽

Coal Structure ◽

Pyrolysis Behavior ◽

Parent Coal

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Thermal Dissolution of Shenfu Sub-Bituminous Coal Promoted by Lignin

The Open Fuels & Energy Science Journal ◽

10.2174/1876973x01811010071 ◽

2018 ◽

Vol 11 (1) ◽

pp. 71-80

Author(s):

Huihui Wu ◽

Hengfu Shui ◽

Lei Yang ◽

Xiaoling Wang ◽

Chunxiu Pan ◽

...

Keyword(s):

Synergistic Effect ◽

Bituminous Coal ◽

Soluble Fraction ◽

Effect Of Temperature ◽

Mean Values ◽

Thermal Dissolution ◽

Elementary Analysis ◽

Experimental Values ◽

The Individual

Objective: Thermal Dissolution (TD) and Co-thermal Dissolution (CTD) of Shenfu (SF) coal and lignin were studied. The effect of temperature on the TD and CTD of SF coal and lignin was discussed. Method: The synergistic effect of SF coal and lignin in CTD was probed with the characterization of thermal dissolution soluble fraction by elementary analysis, FTIR and TG determinations. Result: The results suggested that TD activity of lignin was higher than that of SF coal. Both SF coal and lignin gave their maximal thermal dissolution yield (TDY) of 57.6 and 82.5%, respectively at 360oC. In CTD of SF coal and lignin process, the experimental values (expressed by EXP) of TDY and Thermal Dissolution Soluble Yield (TSY) were both higher than the corresponding calculated weighted mean values (expressed by CAL) of TDY and TSY obtained from the individual TD of SF coal and lignin, suggesting that there existed a synergistic effect in the CTD of SF coal and lignin. Both TDY and TSY in CTD were enhanced to maximal values at 360oC with (EXP-CAL) values of 3.4 and 7.5%, respectively. Conclusion: There were interactions between SF coal and lignin in the CTD process. The pyrolysis of lignin at low temperature may form some intermediates such as phenoxy radicals, and these intermediates can further cause depolymerization of coal, thus promoting the TD of coal.

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