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Tectonic coal exhibits nonlinear energy storage characteristics, which verifies why the tectonic coal is prone to coal and gas outburst from the principle of energy dissipation. 0.1 and 0.2 MPa/s, respectively, as shown in Table 1. In the second group, the loading rate was kept constant (0.1 MPa/s) and the confining pressures were 8, 16
A single indicator cannot fully reflect the value of the energy storage system, so this paper adopts five indicators, namely LCOE, total investment, round-trip efficiency, energy density and DPP, to make a comprehensive evaluation, and the performances of each energy storage system are presented in Table 10.
The energy-storage limit of granite with different dip angles is also explored based on complete stress–strain curves. 20 defined the ratio of the kinetic energy of the broken coal mass
1. Introduction. To reduce carbon emissions and achieve global carbon neutrality, the installed capacity of renewable energy increases rapidly (∼10% per year) in recent years [1].However, the intermittent nature of most renewable energy sources, such as solar and wind, causes severe fluctuation on the power supply side and significantly
Kidybiński [9] and Singh [10] thought that the elastic strain energy stored in coal is closely associated with the occurrence of coal or rock bursts, and introduced the
Coal mines in the goaf are formed by the collapse and accumulation of coal rock, and the process of oxidizing and heat storage of singular coal does not reflect the real environmental conditions within the airspace. In this study, coal and rock mixing on coal spontaneous combustion (CSC) is experimentally investigated, and the bituminous coals
The index W et is calculated as the ratio of the elastic strain energy density to dissipated strain energy density at the stress level of 80–90% of the peak strength of rock specimen, and the corresponding unloading test needs to conduct (Note: For ease of 26
The details of prepared coal samples are listed in Table 2. Fig. 3. Water saturation apparatus for coal samples: a saturating It demonstrates that the ductile coal mainly undergoes the energy storage process before peak stress, but energy dissipation in the post-peak-stress stage. where the index D 1 is the ratio of the elastic energy
To evaluate the coal burst proneness more precisely, a new energy criterion namely the residual elastic energy index was proposed. This study begins by performing the single-cyclic loading-unloading uniaxial compression tests with five pre-peak unloading stress levels to explore the energy storage characteristics of coal.
21-22 over the previous year absolute terms, the installed capacity of electricity generation increased by 4.68% to 4,82,232 MW in 2021-22 over 4,60,659 MW in 2020-21 with the major share of installed capacity existing with uti. es i.e. 82.84% (Table 2.3). India''s Energy mix has been seeing a shift from more conventional resources.
The risk of a coal burst rises with the excavation depth and other mining-related activities. These devastating coal burst activities are a major concern during deep coal mining. During such activities, the loading rate is a major cause of damage. Different indexes, including the elastic strain modulus index (Wet), bursting energy index (Ke),
Note: In the table, F-under uniaxial loading conditions, the sample bears the maximum load, N; S-stress area of sample, mm 2; I s-point load strength of rock, MPa; σ tan,max-maximum shear stress of surrounding rock (tunnel), MPa; A 1-elastic strain energy stored at the peak time calculated by the elastic modulus E 50, μJ/mm 3; A 2
The strain energy storage index WET was widely used to evaluate coal burst liability, but the scientific evidence for selecting the unloading stress level interval
To investigate the influence of gas pressure on rock burst proneness of coal, the rock burst proneness tests were conducted under different gas pressures. Based on the energy method, the rock burst proneness and energy accumulation law are analyzed. The following conclusions can be drawn: (1) The change laws of impact
Coal burst is a type of dynamic geological hazard in coal mine. In this study, a modified bursting energy index, which is defined as the ratio of elastic strain energy at the peak strength to the released strain energy density at the post-peak stage, was proposed to evaluate the coal burst proneness. The calculation method for this index
index is defined as the ratio of U d and U e at the point of 0. 80–0.90 ultimate strength. At this point, the input energy will be the sum of U d and U e. The index definition reveals that
To investigate the influence of gas pressure on rock burst proneness of coal, the rock burst proneness tests were conducted under different gas pressures. Based on the energy method, the rock burst proneness and energy accumulation law are analyzed. The following conclusions can be drawn: (1) The change laws of impact
In this study, a new coal bursting liability index called the elastic modulus damage index (EMDI) was developed using rock damage variables and the elastic strain
At the same mixing ratio, the siltstone/coal mixture has the largest activation energy of 38.37 kJ/mol, the mudstone/coal mixture is slightly smaller at 37.08 kJ/mol, and the shale/coal mixture has the smallest activation energy of 34.31 kJ/mol. Siltstone has the
Another performance index for CAES is the charging energy rate (CER), which is the ratio of the electric energy re-generated to the electric energy stored. (11) CER = E out, e l e c E in, e l e c Since CER uses electric energy to define the efficiency of storage system, it sometimes is called AC-to-AC efficiency and can be widely used for
To explore the differences in mechanical and energy evolution characteristics of coal–rock composite samples with different coal–rock height ratios, uniaxial compression tests of coal–rock composite samples with height ratios ranging from 4:1 to 1:4 were conducted by PFC software. A total of 7 PFC models were built and
Energy evolution is of great significance for exposing the failure mechanism of coal reservoirs and evaluating the fracturing effect. This study conducted uniaxial compression experiments with bedding intersection angle (θ) as a variable, calculated the energy and analyzed their controlling effects on coal deformation, failure and brittleness.
The CSIRO assessment used the Australian Energy Market Operator''s (AEMO) 2022 Integrated System Plan for its analysis of what might be required with the step change and hydrogen superpower
The bursting liability rating criteria according to the energy storage coeficient and energy release coeficient were determined based on the damage and
This article uses the U.S. format. Because approximately 3,412 Btu/hr equals 1 kW, we can easily determine the thermodynamic efficiency of a power plant by dividing 3,412 by the heat rate. For
Based on the energy consumption characteristics of the entire rock loading process, a linear energy storage method was proposed. Furthermore, a new criterion of
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Here, the greatest power consumption occurs in the WE process, which is 537.3 MW (69.8% of the total) for CTM and 2116.5 MW (69.9% of the total) for CTO. Thus, the total scale of energy storage via the combined system of EFCG + WE, including PC, liquid oxygen, liquid hydrogen, liquid CO 2, and WE, is about 770.2 MW.
Abstract. Both carbon dioxide and hydrogen can be stored in coal seams as two enabling components of energy transition from fossil-based systems to renewable sources. In both cases, understanding the evolution of coal permeability under the influence of gas adsorption is extremely important. The gas sorption-induced deformation is
Currently, existing energy storage technologies can be divided into the following categories based on the type of storage medium: (1) Mechanical energy storage technologies, including pumped hydro storage [14, 15], compressed air energy storage [16, 17], carbon dioxide and supercritical carbon dioxide energy storage [18, 19],
DOI: 10.1016/J.IJMST.2021.04.001 Corpus ID: 234871717 A new criterion of coal burst proneness based on the residual elastic energy index @article{Gong2021ANC, title={A new criterion of coal burst proneness based on the residual elastic energy index}, author={Feng-qiang Gong and Yunliang Wang and Zhiguo Wang and Junfeng Pan and Song Luo},
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