Preliminary feasibility analysis of a hybrid pumped-hydro energy storage system using abandoned coal mine goafs

Fan, Jinyang; Xie, Heping; Chen, Jie; Jiang, Deyi; Li, Cunbao; Tiedeu, William Ngaha; Ambre, Julien

doi:10.1016/j.apenergy.2019.114007

Cited by 153 publications

(55 citation statements)

References 46 publications

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“…Many research [39][40][41] have shown that the permeability of coal seams is greatly affected by the stress acting on the coal seam. The relationship between permeability and equivalent stress of coal seam follows an exponential function, [42][43][44][45] implying that a smaller stress release will also lead to a significant increase in coal seam permeability so that the gas in coal is easy to flow out to the fractures caused by PCL mining, which will lead to significant decreases in gas pressure and gas content of coal seams. On the other hand, the role of PCL mining is to reduce the stress of the protected layer, so as to enhance its permeability and provide favorable conditions for gas desorption and flow.…”

Section: Protection Rangementioning

confidence: 99%

“…8 With increasing mining depth, the ground stress, coalbed methane (CBM) pressure, and CBM content increase gradually while the coal seam permeability decreases, which makes coal mine gas disaster control and gas drainage more difficult. 9,10 Due to the high gas pressure, high ground stress, and low gas permeability of coal seams, the threat of gas explosions and coal and gas outbursts is becoming increasingly serious, and the CBM recovery is becoming a tangible challenge. 11 In coal mines containing multiple coal seams, protective coal layer (PCL) mining is the most economical and effective regional gas disaster control and prevention method.…”

Section: Introductionmentioning

confidence: 99%

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Physical simulation of upper protective coal layer mining with different coal seam inclinations

Fang

Shu

Wang

2020

Energy Science & Engineering

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Protective coal layer (PCL) mining is a preferred regional method for preventing coal and gas outbursts; stress‐relief of PCL mining is the prerequisite of pressure‐relief gas drainage. In order to study the stress‐relief effect of PCL mining on protected coal seams and determine the protection scope of PCL mining under different inclinations, this paper uses physical simulations to study the stress‐relief law and deformation characteristics of the strata during upper PCL mining with a gentle inclination (25°), an intermediate inclination (45°), and a steep inclination (65°). The results show that as the coal seam dip increases, the degree of deformation and failure of the overburden strata gradually decreases, the severe subsidence and expansion area of the overburden strata tends to gradually develop in the uphill direction of the working face, and the floor strata underlying the protective seam significantly expand toward the goaf. However, the absolute value of the upward movement of the floor strata is much smaller than that of the roof strata; and the greater the dip angle, the greater the ratio of floor displacement to roof subsidence. The stress‐relief curve of the protected layer is approximately U‐shaped. As the inclination of the coal seam increases, the stress‐relief range decreases gradually. The maximum relief‐stress and the stress release coefficient of the protected layer initially increase and then decrease. The stress concentration coefficient of the protected coal seam initially increases first and then decreases in both uphill and downhill of the working face in the PCL. As the inclination increases, the stress‐relief angle of the downhill boundary initially increases and then decreases, while the stress‐relief angle of the uphill boundary decreases gradually. Our research results provide guidance for the delimitation of the protected scope of PCLs with different dip angles.

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Section: Protection Rangementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physical simulation of upper protective coal layer mining with different coal seam inclinations

Fang

Shu

Wang

2020

Energy Science & Engineering

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“…Besides this advantage, Menéndez et al [92] claim that UPHSP are less impacting than conventional PHSP, because of the reduction in interventions on the surface environment (due to the lack of a lower surface reservoir), although it can influence the underground environment and groundwater. Menéndez et al [59,93] also claim that the use of abandoned mines as a lower reservoir can minimize impacts and increase the benefits of UPHSP, since the impacts of mine construction have already occurred.…”

Section: Underground Phspmentioning

confidence: 99%

Pumped hydro storage plants: a review

Vilanova

Flores

Balestieri

2020

J Braz. Soc. Mech. Sci. Eng.

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Pumped hydro storage plants (PHSP) are considered the most mature large-scale energy storage technology. Although Brazil stands out worldwide in terms of hydroelectric power generation, the use of PHSP in the country is practically nonexistent. Considering the advancement of variable renewable sources in the Brazilian electrical mix, and the need to provide flexibility to the national electrical system, several official documents cite PHSP as an important alternative for the expansion of the Brazilian electrical system. This article presents the state of the art of PHSP and its use, in order to create a theoretical basis for future research on the subject, also providing theoretical support for Brazilian energy planning. The review includes a global panorama on the use of PHSP in the world, the technical and projective foundations on this type of technology, its benefits, and disadvantages, in addition to the new configurations and possible layouts for the construction of pumped hydro storage plants. Finally, the challenges and trends for the dissemination of PHSP technology are addressed.

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“…Once the salt cavern leaks, it will lead to oil leakage, which may bring the risk of serious disasters such as cavity scrapping and ground subsidence, even causing major fires and activating regional faults [26][27][28]. Therefore, the porosity and permeability characteristics of the rock surrounding the caverns are important for evaluating its tightness [29][30][31][32]. Moreover, the essence of these macroscopic characteristics is the macroscopic embodiment of its microscopic pore structure.…”

Section: Introductionmentioning

confidence: 99%

Microscopic Pore Structure of Surrounding Rock for Underground Strategic Petroleum Reserve (SPR) Caverns in Bedded Rock Salt

et al. 2020

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Using salt caverns for an underground strategic petroleum reserve (SPR) is considered as an ideal approach due to the excellent characteristics of low porosity, low permeability, self-healing of damage, and strong plastic deformation ability of rock salt. Salt deposits in China are mostly layered rock salt structures, with the characteristics of many interlayers, bringing great challenges for the construction of SPR facilities. Studying the microscopic pore characteristics of the rock surrounding SPR salt caverns in different environments (with brine and crude oil erosion) is necessary because the essence of mechanical and permeability characteristics is the macroscopic embodiment of the microscopic pore structure. In this paper, XRD tests and SEM tests are carried out to determine the physical properties of storage media and surrounding rock. Gas adsorption tests and mercury intrusion tests are carried out to analyze the microscopic pore structure, specific surface area variation and total aperture distribution characteristics of SPR salt cavern host rock. Results show that: (1) Large numbers of cores in interlayer and caprock may provide favorable channels for the leakage of high-pressure crude oil and brine. (2) The blockage of pores by macromolecular organic matter (colloid and asphaltene) in crude oil will not significantly change the structural characteristics of the rock skeleton, which is beneficial to the long-term operation of the SPR salt cavern. (3) The water–rock interaction will bring obvious changes in the micro-pore structure of rock and increase the leakage risk of the storage medium. The results can provide theoretical bases and methods for the tightness analysis of China’s first underground SPR salt cavern.

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Preliminary feasibility analysis of a hybrid pumped-hydro energy storage system using abandoned coal mine goafs

Cited by 153 publications

References 46 publications

Physical simulation of upper protective coal layer mining with different coal seam inclinations

Physical simulation of upper protective coal layer mining with different coal seam inclinations

Pumped hydro storage plants: a review

Microscopic Pore Structure of Surrounding Rock for Underground Strategic Petroleum Reserve (SPR) Caverns in Bedded Rock Salt

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