The effect of thermal stresses on the relation between rock failure and temperature and pressure of supercritical carbon dioxide jet

Li, Mukun; Ni, Hongjian; Wang, Ruihe; Song, Weiqiang

doi:10.1002/ghg.1762

Cited by 11 publications

(3 citation statements)

References 38 publications

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“…Chen et al (2017) showed that the main effects of liquid CO 2 phase change on coal are impact force effects and high-pressure gas quasi-static stress field effects, which produce tensile stress on coal and change the structure of the coal fissures. For compressible fluids, sudden changes in temperature occur with large pressure gradients (Li et al 2018a;Charrière et al 2010). According to Liu et al (2020a, b), thermal expansion and contraction will occur inside the rock under the effect of temperature impact.…”

Section: Scanning Electron Microscope Resultsmentioning

confidence: 99%

Cracking characteristic induced by supercritical carbon dioxide phase change in micro-cracks of coal

Liu

Shen

Wei

et al. 2022

Geomech. Geophys. Geo-energ. Geo-resour.

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The phase-change action causes three phenomena: an increase in the width of the original crack structure of coal, mutual extension and penetration, and generation of new fractures. Fracture evolution process causes coal and cement to be dislodged, forming micropowders, the range of coal particle size is negatively correlated with temperature and pressure of SC-CO 2 . The SC-CO 2 phase change inside coal pores increases pore size and accumulated pore volume. The effect of SC-CO 2 phase-change fracturing is enhanced with increasing temperature and pressure. Article Highlights• Supercritical carbon dioxide phase change acts on the coal and causes it to be destroyed at the microcrack scale. • Supercritical carbon dioxide phase change causes coal fissures to widen, penetrate, extend, and create new cracks. • The phase-change fracturing of a supercritical carbon dioxide jet breaking coal is the cause of coal powders. Keywords Supercritical carbon dioxide jet • Coal powder • The SC-CO 2 phase change fracturing • Original crack • Pore

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Section: Scanning Electron Microscope Resultsmentioning

confidence: 99%

Cracking characteristic induced by supercritical carbon dioxide phase change in micro-cracks of coal

Liu

Shen

Wei

et al. 2022

Geomech. Geophys. Geo-energ. Geo-resour.

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“…At present, a lot of experiments on SC-CO 2 jet rock breaking have been conducted, proving that SC-CO 2 jets have greater advantages than water jets in rock breaking [4,5,[11][12][13][14][15][16]. What is interesting about the mechanism is that a large temperature gradient and high-temperature stress can be generated under a SC-CO 2 jet, and the higher temperature stress is the main reason why the SC-CO 2 jet is superior to the water jet in rock breaking [17][18][19][20]. Nevertheless, there are few studies on the SC-CO 2 jet flow field and stress field near the critical point due to the drastic changes in density, heat capacity, etc.…”

Section: Introductionmentioning

confidence: 99%

A Possible Explicit Equation Fitting Method for the Gaseous Heat Capacity Near the Critical Point Based on Density and Temperature

Wang

Sun

et al. 2023

Processes

Self Cite

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CO2 is a potential fluid for absorbing and accumulating thermal energy; an accurate and fast calculation method for the heat capacity is essential for the study of the flow state near the critical point. However, the calculation of the heat capacity near the critical point by the equations suggested by NIST can easily be divergent, such as for CO2, nitrogen, methane, etc. Therefore, an explicit fitting equation was studied. The fitting equation, which used density and temperature as variables and contained three constants, was derived from the nature of heat capacity change (molecular kinetic energy and potential energy). Based on the heat capacity data of the NIST WebBook, the heat capacity of CO2 is taken as the example for the equation deduction and parameter fitting. The three constants were defined in order by Origin fitting software. By this new approach, it is found that the heat capacity at the critical point is below 1% deviant from that of the NIST WebBook. Moreover, the heat capacities that are difficult to be calculated in the NIST WebBook are well calculated. The study shows that the fitting equation is efficient for the prediction of heat capacity of gases near the critical point.

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“…Recently, most studies have focused on new rock-breaking methods, such as jet rockbreaking, using different media and nozzle structures and have achieved various results. Li Mukun et al introduced a new rock fragmentation method that effectively combines pressure shock with thermal shock [13]. The results show that this method has a higher rock fragmentation efficiency than the water jet method.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations and Experiments on Single-Tooth Rock-Breaking

Wang

et al. 2022

Machines

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The rock-breaking efficiency of a drilling tool directly affects the production costs and progress of foundation construction. It is essential to understand the mechanism of mechanical rock-breaking to improve rock-breaking efficiency. In this study, dynamic rock-breaking simulation research was carried out on a drill bit and was based on the LS-DYNA simulation platform. Additionally, the influence of the rotational speed of the spindle and the feed rate on the force of the drill bit in the rock-breaking process was obtained. The influence of the rotational speed of the spindle and the feed rate on drill vibration was also analyzed. The content of the presented theoretical and simulation research was verified through experiments. The following conclusions were drawn: first, the reaction force that rock has on the drill bit presents a law according to different rock types and drilling process parameters. With the increase in rotational speed, the axial reaction force decreases. With the increase in the feed rate, the axial reaction force increases. The effect of rock type on axial reaction force is nonlinear. Second, the influence of the spindle rotational speed and feed rate on the vibration of the drill bit also presents a law during rock-breaking. When the feed amount is constant, the transverse vibration slows down, and the axial vibration intensifies as the rotational speed increases. When the rotational speed is constant, as the feed increases, the transverse vibration slows down and the axial vibration intensifies. The research results provide a theoretical basis for selecting drilling process parameters and for improving rock-breaking efficiency.

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The effect of thermal stresses on the relation between rock failure and temperature and pressure of supercritical carbon dioxide jet

Cited by 11 publications

References 38 publications

Cracking characteristic induced by supercritical carbon dioxide phase change in micro-cracks of coal

Cracking characteristic induced by supercritical carbon dioxide phase change in micro-cracks of coal

A Possible Explicit Equation Fitting Method for the Gaseous Heat Capacity Near the Critical Point Based on Density and Temperature

Numerical Simulations and Experiments on Single-Tooth Rock-Breaking

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