Variations in the mechanical behavior of Illinois bituminous coals

West, Richard; Markevicius, Gediminas; Malhotra, V. M.; Hofer, Stephen

doi:10.1016/j.fuel.2012.03.042

Cited by 13 publications

(9 citation statements)

References 16 publications

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“…Our recent research efforts [11,12] have been directed toward evaluating the potential risks which may be associated with sequestering CO 2 in Midwestern coal seams and shale formations. The flexural strength and flexural modulus measurements on Illinois bituminous coal [11] suggested that there is a considerable strength and modulus heterogeneity in the coal samples which were free of visible defects.…”

Section: Introductionmentioning

confidence: 99%

“…The flexural strength and flexural modulus measurements on Illinois bituminous coal [11] suggested that there is a considerable strength and modulus heterogeneity in the coal samples which were free of visible defects. The strength of strips derived from a single chunk of coal showed strength variations from 2.8 MPa to 11.2 MPa, while modulus variations were 0.7GPa to 3.4GPa.…”

Section: Introductionmentioning

confidence: 99%

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Is there a potential of emission of sequestered CO2 from Illinois bituminous coal under shockwaves?

Harbin

Twombly

West

et al. 2015

Fuel

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h i g h l i g h t sProbed how shockwaves may affect the sequestered CO 2 in bituminous coal. Fabricated a system to apply shockwaves to cores while monitoring emitted gases. Shockwaves did not induce gas emission from non-pressurized coal cores. Massive amounts of CO 2 emitted from coal cores under compressive shock. Shocks ejected almost all the CO 2 from pressurized coal in less than 1 h. a b s t r a c tThe mitigation of potential global warming due to the emission of greenhouse gases, especially CO 2 , would require large-scale geological sequestration. Though current emphasis has been on identifying and characterizing the potential geological sequestration reservoirs, there is also an urgent need to ensure that the sequestered CO 2 will remain in place under reasonable perturbations, e.g., under seismic activity. One of the potential geological reservoirs identified is unmineable coal seams due to the advantage of recovering fuel gas like CH 4 while sequestering CO 2 . Therefore, a closed experimental setup was constructed where Illinois bituminous coal cores could be subjected to compressive shockwaves while simultaneously monitoring the emission of gases from CO 2 pressurized coal cores. The results from the pressurized coal cores were compared with the behavior manifested by un-pressurized coal cores as well as porous pumice stone cores, which were also subjected to shockwaves. As expected, the un-pressurized cores showed no significant emission of CO 2 when subjected to shock; however, this was not the case for the cores which were pressurized with CO 2 . The results indicate that massive amounts of CO 2 would be emitted if the cores were exposed to atmospheric pressure simulating a situation where caprock has been compromised during primary seismic activity. Irrespective of the belief that coal interacts strongly with CO 2 , both chemically and physically, compressive (0.374 MPa) shockwaves forced almost all the CO 2 to be ejected from the coal cores. Surprisingly, most, if not all, the sequestered CO 2 would be emitted in less than 1 h if the cores were subjected to reasonably moderate shocks. In actual seismic activity conditions, one expects conditions to be even more severe than in the experimental setup used in this study because of the presence of compressive and transverse stresses and shears. If such is the case, CO 2 may be emitted even faster. It is reasonable to argue that Illinois bituminous coals may not be suitable hosts for sequestering CO 2 because the region is prone to seismic activity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Is there a potential of emission of sequestered CO2 from Illinois bituminous coal under shockwaves?

Harbin

Twombly

West

et al. 2015

Fuel

Self Cite

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“…As a further consequence, complex fracture behavior results due to inhomogeneous distribution of inorganic constituents in charcoal matrix. Mostly, magnitude of stress acting on the charcoal defines mechanical behavior that may be dominated by elastic and plastic deformations [16][17][18][19][20]. Such deformation largely depends on stability and physical characteristics of the pores under equilibrium/non-equilibrium conditions [21].…”

Section: Introductionmentioning

confidence: 99%

Anisotrpic friction behavior of charcoal and the influence of humidity

Kumar

Radhika

Chakravarty

et al. 2015

Tribology International

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“…It also relates to the extent of disasters. As a result, numerous scholars have studied how physical and geometrical parameters affect the strength of coal, such as petrographic composition [2], size and shape of specimen [2][3][4][5], stress path [6], temperature [7], and the type of adsorptive gas and its adsorption/desorption [8][9][10]. In addition, the volume percentile of different chemical constituents in coal have been proved to possess distinct mechanical properties for coal sample [11] and the contribution to the strength of coal sample differs from one constituent to another.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Bedding Structure on Mechanical Property of Coal

Zhang

Guo

et al. 2014

Advances in Materials Science and Engineering

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The mechanical property of coal, influencing mining activity considerably, is significantly determined by the natural fracture distributed within coal mass. In order to study the effecting mechanism of bedding structure on mechanical property of coal, a series of uniaxial compression tests and mesoscopic tests have been conducted. The experimental results show that the distribution characteristic of calcite particles, which significantly influences the growth of cracks and the macroscopic mechanical properties of coal, is obviously affected by the bedding structure. Specifically, the uniaxial compression strength of coal sample is mainly controlled by bedding structure, and the average peak stress of specimens with axes perpendicular to the bedding planes is 20.00 MPa, which is 2.88 times the average amount of parallel ones. The test results also show a close relationship between the bedding structure and the whole deformation process under uniaxial loading.

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Variations in the mechanical behavior of Illinois bituminous coals

Cited by 13 publications

References 16 publications

Is there a potential of emission of sequestered CO2 from Illinois bituminous coal under shockwaves?

Is there a potential of emission of sequestered CO2 from Illinois bituminous coal under shockwaves?

Anisotrpic friction behavior of charcoal and the influence of humidity

The Effect of Bedding Structure on Mechanical Property of Coal

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