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The attractive Zhundong coalfields located in the Northwestern PR China are featured by many high qualities, such as low contents of mineral matters and total sulfur. However, a significant amount of sodium species are also embedded in the Zhundong coals (ZDC), which has been a barrier for efficient utilization of them. In this work, to better understand the detailed behaviors of sodium species and...
Lignite, a suitable feedstock for direct coal liquefaction (DCL), is usually rich in sodium and calcium species. To better understand chemical transformation of inherent sodium and calcium species during DCL, two lignites rich in sodium and calcium species were liquefied in this work. The results show that both Australia lignite (AU) and Hami lignite (HM) are preferred raw materials for DCL. After...
Hydraulic fracturing is an important technology for the development of unconventional gas such as tight sand gas. In this paper, a series of fracturing experiments were conducted on hollow cylindrical sandstone specimens with a diameter of 50mm to investigate the initiation, propagation, and closure of hydraulic fractures. In addition, microscope and X-ray CT scanner were employed to observe the morphology...
Since direct coal liquefaction (DCL) was invented, it has been a promising technology for the efficient utilization of coal resources and the mitigation of the oil crisis. Generally, coals are regarded as mixtures composed of organic matter and mineral matter. The mineral matter content and nature of coal is highly variable and has been proved to significantly influence the thermal behavior of coals...
Low-temperature pyrolysis could effectively recover heavy oil from direct coal liquefaction residue (DCLR), and the derived DCLR char (DCLRCH) could be gasified to compensate hydrogen consumption during liquefaction. The staged processing of DCLR, pyrolysis and gasification, is thought to be a promising method for its high-efficient usage. In the work, DCLR was pyrolyzed under different pyrolysis...
Fe catalysts supported on activated carbon untreated and treated by HNO 3 were prepared by an ultrasound-assisted incipient wetness method and characterized using N 2 adsorption/desorption, scanning electron microscopic (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Desulfurization activity was evaluated at a fixed bed reactor under a simulated flue gas...
Understanding gas storage and transport mechanisms in shale is crucial for reservoir evaluation and gas production forecast. The shale matrix has a complex pore structure, with sizes ranging from nanometres to micrometres. Although diffusion plays a significant role in shale gas transport in the reservoir, systematic studies of gas diffusion in shale are rare. This paper studied the methane diffusion...
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