High-resolution X-ray computed tomography observations of the thermal drying of lump-sized subbituminous coal

Optimizing enhanced coalbed methane recovery for unhindered production and CO2 injectivity

“…This is consistent with observations for bituminous coal . In the case of a constant head permeability test, an increase in permeability is expected in the moist coal experiments as the coal continues to dry with the flow of large volumes of various gases (Mathews et al, 2011). However, the transient pulse test approach minimizes this moisture loss over the more invasive fluid flow testing approaches and helps retain the integrity of the sample.…”

Pelleted Xylit‐Wood‐Mixtures: Part 1 – Drying and Hygroscopic Sorption Behaviour

“…Solche, nicht nur auf Schrumpfung zurückzuführenden Bindeprozesse im Verlauf der Trocknung sind von Holz [11], Weichbraunkohle [12] und höher inkohlten Stoffen bekannt [13,14] 3.2 beschriebenen Versuchsbedingungen erhält man einen Desorptionskurvenlauf, der durch ein abnehmendes Massenverhältnis m GGW /m 0 charakterisiert ist.…”

3D mapping of carbon dioxide-induced strain in coal using digital volumetric speckle photography technique and X-ray computer tomography

“…In previous efforts, medical XCT has been used to investigate cleat spacing and cleat aperture in coal samples (Karacan and Okandan, 2000;Mazumder et al, 2006). Later, the high resolution X-ray computerized tomography (HRXCT) or micro-CT(μCT) with typical spatial resolutions of 250 μm is used for analyzing the structure of coal (Golab et al, 2013;Heriawan and Koike, 2015;Kumar et al, 2011;Mathews et al, 2011;Wang et al, 2013;Yao et al, 2009), and its dual energy scanning capability has also been used for the maceral and mineral composition analyses of coal (Karacan and Mitchell, 2003;Van Geet et al, 2001a, 2001b. Karacan (2007) evaluated the swelling-induced volumetric strains occurring in a stressed coal subjected to CO 2 pressure based on the maps of coal density and mass percentage of sorbed CO 2 .…”