Effects of composition and pore evolution on thermophysical properties of Huadian oil shale in retorting and oxidizing pyrolysis

Xu, Shaotao; Sun, Youhong; Lü, Xiaoshu; Yang, Qinchuan; Li, Qiang; Wang, Zhendong; Guo, Mingyi

doi:10.1016/j.fuel.2021.121565

Cited by 19 publications

(3 citation statements)

References 33 publications

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“…This reduction is primarily attributed to the inherently lower thermal conductivity of hydrophobic coatings containing Si-based or F-containing compounds compared to substrates such as stainless steel [ 43 , 44 ]. Additionally, the rough surface structure of the coatings, which harbors more air, not only reduces the contact area with water droplets but also further lowers the thermal conductivity [ 45 ]. Consequently, when applied to substrates like stainless steel with higher thermal conductivity, they lead to a reduction in the overall thermal conductivity of the structure.…”

Section: Resultsmentioning

confidence: 99%

Anti-icing performance of hydrophobic coatings on stainless steel surfaces

Wang,

Cao,

et al. 2024

Heliyon

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Section: Resultsmentioning

confidence: 99%

Anti-icing performance of hydrophobic coatings on stainless steel surfaces

Wang,

Cao,

et al. 2024

Heliyon

Self Cite

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“…Oil shale can be defined as a sedimentary rock containing various amounts of solid organic materials dispersedly bound in a mineral matrix . The organic phase is usually of excellent economic and practical value, making oil shale a renewed research focus in the last several years. − In addition to obtaining shale oil and combustible gas through low-temperature retorting on the ground, − recent studies have suggested that oil shale is a fine gas source rock, , whose gas content can approach the lower limit of the Lewis shale in the San Juan Basin, United States …”

Section: Introductionmentioning

confidence: 99%

Greenhouse Gas Emissions during Oil Shale Crushing and Its Main Controlling Factors: A Contrast Study of Oil Shale in Yaojie and Fushun Areas, China

Wang,

Lu,

Chen

et al. 2024

ACS Omega

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Geological bodies are important sources of greenhouse gas (GHG) emissions. Organic-rich oil shale in sedimentary basins is a good gas source rock, the GHG in which will be released into the atmosphere during crushing to affect climate change. Quantitative calculations of GHG emissions during oil shale crushing were carried out on oil shales from the Yaojie (YJ) and Fushun (FS) mining areas in China. Organic geochemistry, X-ray diffraction, and pore structure analysis experiments, as well as the relationship between storage time and GHG emissions, were analyzed to investigate the main controlling factors of GHG release in different types of oil shales. The results showed that the CH 4 and CO 2 released from the YJ oil shale were 0.002−0.145 mL/g and 0.011−0.054 mL/g, respectively; the CH 4 and CO 2 released from the FS oil shale were 0.0001−0.0008 mL/g and 0.002−0.045 mL/g, respectively. Residual CH 4 release was closely related to total organic carbon (TOC) and maturity: the CH 4 released from the organic-rich and mature YJ oil shale was much higher than that of the FS oil shale, which is relatively organic-lean and immature. The control factors of the released CO 2 vary in different regions: CO 2 released from the YJ oil shale was somewhat affected by the TOC, while that released from the FS oil shale was mainly controlled by carbonate minerals and their contributing pores. The results of pore structure and organic maceral analyses indicated that both organic and inorganic pores of the YJ oil shale are occupied by asphaltenes, forming a key gas preservation mechanism of residual CH 4 and CO 2 as solutes dissolved in asphaltenes. In addition, CO 2 has a greater absorptive capacity than CH 4 and is therefore more difficult to release during the same crushing time. As oil shale is stored for longer periods, residual CH 4 will be preferentially released to the atmosphere, while residual CO 2 will be released in large quantities during crushing.

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“…This method does not visually observe individual or connected pores, however. Since pore fractures in oil shale are the main transport pathways for oil and gas, observation of the location, distribution and geometry of internal pores and fractures in three dimensions after microwave pyrolysis are particularly useful [20].…”

Section: Introductionmentioning

confidence: 99%

Pore and fracture scale characterization of oil shale at different microwave temperatures

Zhao¹,

Cheng²,

Zhang³

2023

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The spatial complexity of oil shale systems is manifested by microstructure, pore space randomness and extensive heterogeneity. A microwave pyrolysis device developed for this study was used to pyrolyze oil shale, and the microstructure before and after pyrolysis was visually examined and quantified. The internal structure of the rock and the extent of pore and fracture expansion are more accurately determined in this way. The microstructure of oil shale at different temperatures before and after microwave pyrolysis is identified by X-ray microcomputed tomography (μCT) with automatic ultra-high-resolution scanning electron microscopy (SEM), to observe the heterogeneous state of oil shale on 2D and 3D scales and define the distribution of internal pores and fractures by post-processing μCT visualization. The study found that fractures sized from microns to millimeters along with pore fractures were observed at increasing microwave temperatures. The fractures gradually expanded with increasing temperature in the direction of horizontal or vertical laminae and generated a more connected pore network. The kerogen gradually decreased with a rise in temperature. The porosity increased from 0.26% to 13.69% at the initial temperature. This research is essential for the qualitative as well as quantitative analysis of the internal structure of oil shales under microwave radiation.

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Effects of composition and pore evolution on thermophysical properties of Huadian oil shale in retorting and oxidizing pyrolysis

Cited by 19 publications

References 33 publications

Anti-icing performance of hydrophobic coatings on stainless steel surfaces

Anti-icing performance of hydrophobic coatings on stainless steel surfaces

Greenhouse Gas Emissions during Oil Shale Crushing and Its Main Controlling Factors: A Contrast Study of Oil Shale in Yaojie and Fushun Areas, China

Pore and fracture scale characterization of oil shale at different microwave temperatures

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