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sorption characteristic of coal

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Model development and analysis of coal permeability based ...

Generally, when the seepage characteristics of coal is studied, the units that constitute the dual-porosity coal structure (i.e. coal matrices and fractures) are assumed to be the geometries with rule shapes to quantitatively analyze the impact of effective stresses and the sorption deformation of coal matrices on coal permeability (Palmer & Mansoori 1998; Shi & Durucan 2004).

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Laboratory Isotherms - Mixed Gas, Native Sorption, Coal ...

Coal sorption behaviours may sometimes be best expressed by using one or the other model. Reports are provided on an as received and mineral matter free basis. The logarithmic equation may show very clearly a change in sorption characteristic at a certain pressure whereas this cannot be deduced using the Langmuir approach.

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Absorption and Adsorption of Methane and Carbon Dioxide in ...

The paper shows what can be deduced on sorption mechanisms in hard coals and active carbon by using a theoretical model of sorption of small molecules in elastic submicroporous materials. This model (referred to as the multiple sorption modelMSM) describes both adsorption and absorption phenomena.

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Fractional Characteristics of Coal Fly Ash for Beneficial ...

01/01/2013 · However, the beneficial use of coal fly ash in concrete production and contaminant removal, which have divergent constraints to sorption capacity, requires a more complete understanding of the surface and sorptive characteristics of fly ash. A systematic analysis of fly ash particle size fractions established linkages between particle size, particle morphology, unburned carbon content, .

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Coal sorption characteristics and coal surface tension

These findings provide the basic knowledge for a better understanding of coal sorption characteristics associated with coal seam gas drainage, which will benefit ventilation and degasification design and hence help to prevent coal mine operations from gas outburst disaster.

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Adsorption characteristics of CO2 and CH4 on dry and wet ...

Adsorption characteristics of CO2 and CH4 on dry and wet coal from subcritical to supercritical conditions Chemical Engineering Journal 171 (2011) 45–53 Contents lists available at ScienceDirect Chemical Engineering Journal journal homepage:

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SEISMIC CHARACTERISTICS AND STRAIN OF COAL DURING THE SORPTION

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SEISMIC CHARACTERISTICS AND STRAIN OF COAL DURING THE SORPTION OF CO 2 AND CH 4 A THESIS IN Environmental and Urban Geosciences Presented to the Faculty of the University of Missouri-Kansas City in partial fulfillment of the requirements for the degree MASTER OF SCIENCE by PADMAVATHI IYENGAR B.E., Visvesvaraya Technological University-India, 2005 M.S., University of .

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Article: Influences of temperature and moisture on coal ...

The adsorption capacity of coal shows a linear decrease with increasing temperature. The decreasing rate of adsorption capacity is greater for CO 2 than CH 4, and which is also higher for dry coals. The moist coal sample isotherms for both CO 2 and CH 4 demonstrate a much lower sorption capacity.

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Coal sorption characteristics and coal surface tension ...

01/01/2014 · Coal sorption characteristics and coal surface tension Zhang, Lei ; Ren, Ting ; Aziz, Naj ; Tu, Shihao 2014-01-01 00:00:00 Underground coal mining in the Bulli Seam of Sydney Basin, Australia encounters the problems of coal and gas outburst as the coal contains high concentration of CO2, where certain parts of the seam have been found to be especially hard-to-drain. In order to better ...

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The adsorption-swelling and permeability characteristics ...

15/12/2017 · Coal seams experiencing multiple geological structures are regarded as weak coal seams for their lower strength than normal coal seams. Besides the mechanical characteristics, tectonic movements can also transform the internal structure and promote the development of primary structure coal into tectonically deformed coal.

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Sorption Characteristic of Coal, Particle Size, Gas Type ...

Sorption characteristics of Bulli seam coal samples were examined with respect to coal particle size, gas type and time. Sorption tests were carried out by the indirect gravimetric method for determining gas content in coal. Various coal particle sizes were tested in addition to 54 mm diameter coal core.

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Influence of Coal Particle Size on Coal Adsorption and ...

Hence, coal particle size had a significant influence on the coal sorption characteristics including sorption capacity and desorption hysteresis for CO 2 and CH 4, especially calculated with dry basis of coal. In this study, the 150-212 um (150 um) coal samples achieved higher sorption capacity and followed by 2.36-3.35 mm (2.4 mm), 8-9.5 mm (8 mm) and 16-19 mm (16 mm) particle size samples ...

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Influence of coal particle size on coal adsorption and ...

The sorption isotherm was found to be highly sensitive with helium density of coal which was determined in the procedure of testing the void volume of sample cell.

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"Sorption Characteristic of Coal, Particle Size, Gas Type ...

Sorption characteristics of Bulli seam coal samples were examined with respect to coal particle size, gas type and time. Sorption tests were carried out by the indirect gravimetric method for determining gas content in coal. Various coal particle sizes were tested in addition to 54 mm diameter coal core.

Author: Raul Maria Melgarejo Florentin, Najdat I Aziz, Dennis Black, Long NghiemGet Price

Adsorption characteristics of CO2 and CH4 on dry and wet ...

Adsorption characteristics of CO2 and CH4 on dry and wet coal from subcritical to supercritical conditions Chemical Engineering Journal 171 (2011) 45–53 Contents lists available at ScienceDirect Chemical Engineering Journal journal homepage:

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Dynamic Micromapping of CO2 Sorption in Coal | Langmuir

Our results indicate that details of CO2 sorption into coal pores differ greatly between different coals and depend on the amount of mineral matter dispersed in the coal matrix: a purely organic matrix absorbs more CO2 per unit volume than one containing mineral matter, but mineral matter markedly accelerates the sorption kinetics. Small pores are filled preferentially by the invading CO2 ...

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Sorption Characteristic of Coal, Particle Size, Gas Type ...

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ABSTRACT: Sorption characteristics of Bulli seam coal samples were examined with respect to coal particle size, gas type and time. Sorption tests were carried out by the indirect gravimetric method for determining gas content in coal.

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Sorption characteristics and mechanisms of ammonium by ...

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Sorption characteristics and mechanisms of ammonium by coal by-products: slag, honeycomb-cinder and coal gangue L. Y. Zhang • H. Y. Zhang • W. Guo • Y. L. Tian Received: 5 December 2011/Revised: 16 October 2012/Accepted: 23 December 2012/Published online: 13 February 2013 Islamic Azad University (IAU) 2013 Abstract The adsorption behaviors of ammonium from aqueous solutions were ...

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Coal sorption characteristics and coal surface tension

The theory of coal surface free energy was found to be capable of explaining coal sorption characteristics. These findings provide the basic knowledge for a better understanding of coal sorption characteristics associated with coal seam gas drainage, which will benefit ventilation and degasification design and hence help to prevent coal mine operations from gas outburst disaster. Authors Zhang ...

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Sorption Hysteresis Characterization of CH4 and CO2 on ...

The N 2 sorption isotherms show that a wide distribution of pore size existed in three coal samples, and with the process of coalification, the specific surface area (SSA) decreased and then increased, while the pore size of coal monotonically decreased. This is confirmed by SEM observation.

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Hysteresis of methane/coal sorption isotherms (Conference ...

OSTI.GOV Conference: Hysteresis of methane/coal sorption isotherms. Hysteresis of methane/coal sorption isotherms. Full Record; Other Related Research

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