Using semidefinite programming to calculate bounds on particle size distributions

Dowdy, Garrett R.; Barton, Paul I.

doi:10.1016/j.ces.2017.05.038

Cited by 2 publications

(1 citation statement)

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“…It can be found from Table that the change of volume diameter ( D v ) values including Dv10, Dv50, and Dv90 was insignificant, which means the particle size of the sandstone did not change. Taking the volume median diameter values (Dv50) as examples, which are defined as 50% of the cumulative volume undersize and is one of the most meaningful values for particle size distribution, , the particle sizes of raw and combusted samples were in the range of 128–133 μm. In summary, the general size of the raw and combusted sandstone samples did not change under high-temperature combustion, and high temperature mainly changed the microstructure of the rocks.…”

Section: Resultsmentioning

confidence: 99%

Combustion Characteristics of Tight Sandstone

2018

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As a promising unconventional energy source, tight sandstone gas has attracted increasing attention. Because of the extremely low porosity/permeability of tight sandstone, large scale exploration and development are still challenging. Recently, high-temperature combustion or pyrolysis has been employed to increase sandstone porosity/permeability. In this study, the sandstone samples obtained from Xinjiang Province in China were heated for 30 min in air atmosphere at temperatures of 350, 500, 700, 800, and 900 °C respectively. The combustion characteristics and property changes of sandstone were investigated. In the beginning, thermal decomposition process of sandstone and gas emission were tested using thermogravimetry combined with Fourier transform infrared spectroscopy. Then, the mineral composition and pore structure of different combusted sandstones were tested and analyzed. Moreover, the effects of combustion temperature on particle size of sandstone were also investigated. Finally, scanning electron microscopy (SEM) technology was performed to study the surface appearance change of sandstone. According to the experiment results, organic matters started releasing at 350−500 °C, and most of the minerals such as carbonate decomposed at 600−870 °C. During the combustion process, carbon dioxide and water vapor were the main product gases. With the increase of combustion temperature, the mean pore diameter increased from 8.0 to 22.6 nm, while the particles size remained almost constant. In addition to the increase of pore size, it can be found from SEM photos that the compact surface of sandstone became smooth and some new pores and small cracks appeared on the surface of sandstone after high-temperature combustion, especially at 900 °C. As a result, high-temperature combustion is one of the feasible methods to improve the porosity/permeability of sandstone.

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Section: Resultsmentioning

confidence: 99%