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of sample cell. Hence, coal particle size had a significant influence on the coal sorption characteristics including sorption capacity and desorption hysteresis for CO2 and CH4, especially calculated with dry basis of coal. In this study, the 150212 um (150 um) coal samples achieved higher sorption .
Oct 10, 2009· Adsorption characteristics of coal have traditionally been studied using crushed coal specimens. When adsorption tests are run on a crushed coal specimen, adsorption kinematics are not involved and therefore the equilibrium of gases is attained rapidly.
Abstract. Methane production from coal seams has been actively pursued in the since the mid1970''s. This resource is regarded as an unconventional natural gas supply due to several unique characteristics of the reservoir, including: twophase (water and gas) flow, low effective permeability to gas, and the majority Of the methane being held in an adsorbed state on the internal surfaces of ...
Gas Sorption Characteristics of Tectonically Deformed Coals and Their Implications on Gas Drainage and Outburst Control ... Levine, 1996, Harpalani and Chen, 1997). The gas sorption behavior of coal is controlled by the pore structure of coal, which is significantly influenced by the paleogeologic evolutions of the coal formation. ...
Influence of temperature on coal sorption characteristics and the theory of coal surface free energy Lei Zhanga,*, Naj Aziza, Ting X Rena, Zhongwei Wanga a University of Wollongong, Wollongong, NSW2500, Australia Abstract An experimental study was undertaken to examine the sorption and desorption characteristics of coal at
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 ...
Sorption characteristics and mechanisms of ammonium by coal ... honeycombcinder and coal gangue. The ammonium sorption processes were well modeled by the pseudo secondorder model (R2 [). The experimental data were fitted to both the Langmuir model and the Fre
And they focus on the difference of sorption characteristics of raw coal and residual coal, neglecting a fact that the sorption methane in coal is in various formation, which is determined mostly by pore structure of coal, while the methane of solid solution state is mainly stored in sealed pores of coal (Alexeev et al., 2004b). Thus, this ...
The injection of CO 2 into deep coal beds can not only improve the recovery of CH 4, but also contribute to the geological sequestration of CO adsorption characteristics of coal determine the amount of the greenhouse gas that deep coal seams can store in place. Using selfdeveloped adsorption facility of supercritical fluids, this paper studied the adsorption behavior of supercritical CO ...
According to the literature, the grain size of coal used in adsorption testing affects the measured gas storage capacity and the use of finely ground coal samples in sorption testing leads to a ...
Some characteristics of coal were also investigated, these were namely, the spectra of surface functional groups and the weight loss on evacuation in the temperature range 30–140°C. Adsorption of water is related to the surface functional groups rather than to the extent of the surface.
Sorption characteristic of coal, Particle Size, Gas Type and Time. Underground Coal Operators'' Conference (pp. 207215). Wollongong, Australia: University of Wollongong.
Abstract. Enhanced coalbed methane (ECBM) in deep coal seams is being actively investigated around the world. Since the in situ coal seams are always saturated with water, methane sorption behavior on coal in the presence of water can help accurately assess the amount of recoverable methane.
The coal selected for experiments was a bituminous steam coal with %wt ash content. The shale sample was characterized by rather low TOC (%) but high clay minerals content. The purpose of the study was to compare the high pressure CO 2 sorption characteristics of coal and gas shale and relate it to the particle size of samples subjected ...
Introduction Gas sorption in coal has been studied over the years by many researchers [1, 2, 3], and in recent years, the coal sorption characteristics at high temperatures, beyond the normal temperature of 20 ~ 29 °C, have been identified as an attractive option which can shed light on the behaviour of gas * Corresponding author.
2011 Underground Coal Operators'' Conference The AusIMM Illawarra Branch 10 – 11 February 2011 269 INFLUENCE OF TEMPERATURE ON THE GAS CONTENT OF COAL AND SORPTION MODELLING Lei Zhang,1Naj Aziz, Ting Ren and Zhongwei Wang ABSTRACT: An experimental study was undertaken to examine the sorption and desorption characteristics of coal at temperatures of .
Sorption processes can be used to study different characteristics of coal properties, such as gas content (coalbed methane potential of a deposit), gas diffusion, porosity, internal surface area ...
of coal is established, and the relationship between the adsorption constants a and b of coal and the dangerous degree of outburst in coal seam is determined. Moreover, the distribution characteristics of the pore structure of coal seam with different outstanding risk degrees were obtained by using the
PDF | Hydrogen sorption characteristics of activated carbons (ACs) produced by physical and chemical activations from two coal mines (Kilimli and Armutcuk) in the Zonguldak region, Turkey were ...
Sorption hysteresis characterization of CH 4 and CO 2 on lignite, bituminous coal, and anthracite were studied to improve the understanding of the interaction between gas molecules and different ranks of coal and further improve the precision of the adsorption methods in characterizing pore structure at low pressure. Pore structure of three ranks of coal was investigated with scanning electron ...
Dec 15, 2017· The adsorptionswelling and permeability characteristics of natural and reconstituted anthracite coals. ... Permeability characteristic of coal in the stressstrain course has been investigated in previous papers, ... S. HołdaChanges in mechanical properties of coal due to sorption .
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.
Chemical and petrographic compositions of coal are the measures of maturity and type of organic matter that control the methane sorption characteristics of the coal. 99% of Indian coal occurrences ...
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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