Effective potential energy associated with coal and gas outburst during underground coal mining: case studies for mining safety

2021 ◽  
Vol 14 (11) ◽  
Author(s):  
Sheng Xue ◽  
Chunshan Zheng ◽  
Bingyou Jiang ◽  
Xiaoliang Zheng
Keyword(s):  
Potential Energy ◽  
Case Studies ◽  
Coal Mining ◽  
Effective Potential ◽  
Coal And Gas Outburst ◽  
Underground Coal Mining ◽  
Effective Potential Energy ◽  
Gas Outburst ◽  
Mining Safety

scholarly journals Research on the Disaster-Inducing Mechanism of Coal-Gas Outburst

2020 ◽  
Vol 2020 ◽  
pp. 1-12 ◽  
Author(s):  
Fengxiang Nie ◽  
Honglei Wang ◽  
Liming Qiu
Keyword(s):  
Coal Mining ◽  
In Situ Stress ◽  
Gas Pressure ◽  
Underground Coal Mining ◽  
Coal Gas ◽  
Gas Outburst ◽  
Mining Depth ◽  
Mining Coal ◽  
Occurrence Mechanism

In China, coal-gas outburst is seriously affecting safety of the coal mine. To improve the safety status of underground coal mining, this work investigated the evolution process and occurrence mechanism of coal-gas outburst under the coupling action of stress and gas. Results show that increasing either gas pressure or in-situ stress can make coal destroy and destabilize, and the contribution of gas pressure to coal failure is twice that of in-situ stress. In ultradeep coal mining, coal-gas outburst may occur even under the condition of low gas pressure due to large in-situ stress. Moreover, the larger the mining depth is, the lower the gas index is required for disaster occurrence. The results have certain guiding significance for coal energy mining and the control of coal-gas outburst in deep coal mining.

scholarly journals The enzyme aromatic amine dehydrogenase induces a substrate conformation crucial for promoting vibration that significantly reduces the effective potential energy barrier to proton transfer

2008 ◽  
Vol 5 (suppl_3) ◽  
pp. 225-232 ◽  
Author(s):  
Linus O Johannissen ◽  
Nigel S Scrutton ◽  
Michael J Sutcliffe
Keyword(s):  
Potential Energy ◽  
Proton Transfer ◽  
Aromatic Amine ◽  
Effective Potential ◽  
Energy Barrier ◽  
Transfer Event ◽  
Effective Potential Energy ◽  
Potential Energy Barrier ◽  
Mechanical Methods ◽  
Amine Dehydrogenase

The role of promoting vibrations in enzymic reactions involving hydrogen tunnelling is contentious. While models incorporating such promoting vibrations have successfully reproduced and explained experimental observations, it has also been argued that such vibrations are not part of the catalytic effect. In this study, we have employed combined quantum mechanical/molecular mechanical methods with molecular dynamics and potential energy surface calculations to investigate how enzyme and substrate motion affects the energy barrier to proton transfer for the rate-limiting H-transfer step in aromatic amine dehydrogenase (AADH) with tryptamine as substrate. In particular, the conformation of the iminoquinone adduct induced by AADH was found to be essential for a promoting vibration identified previously—this lowers significantly the ‘effective’ potential energy barrier, that is the barrier which remains to be surmounted following collective, thermally equilibrated motion attaining a quantum degenerate state of reactants and products. When the substrate adopts a conformation similar to that in the free iminoquinone, this barrier was found to increase markedly. This is consistent with AADH facilitating the H-transfer event by holding the substrate in a conformation that induces a promoting vibration.

Effective potential energy surface of HD16O for calculation of highly excited states of nν3 and ν1 + nν3 types

2015 ◽  
Vol 28 (2) ◽  
pp. 133-138 ◽  
Author(s):  
B. A. Voronin ◽  
S. N. Yurchenko ◽  
S. S. Voronina ◽  
A. V. Kozodoev ◽  
J. Tennyson
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Excited States ◽  
Effective Potential ◽  
Energy Surface ◽  
Effective Potential Energy

scholarly journals A Study on the Energy Condition and Quantitative Analysis of the Occurrence of a Coal and Gas Outburst

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Linchao Dai ◽  
Yanbao Liu ◽  
Jie Cao ◽  
Xuelin Yang ◽  
Haitao Sun ◽  
...  
Keyword(s):  
Grain Size ◽  
Quantitative Analysis ◽  
Potential Energy ◽  
Internal Energy ◽  
Coal Sample ◽  
Elastic Potential ◽  
Coal And Gas Outburst ◽  
Gas Outburst ◽  
Elastic Potential Energy ◽  
Outburst Energy

With mining depths increasing, coal and gas outburst disasters are becoming more and more serious and complicated, which directly restricts the production efficiency of coal mines. In order to study the rules of energy dissipation during the occurrence of a coal and gas outburst based on the occurrence mechanisms, a simulation experiment of a coal and gas outburst with a ground stress of 16 MPa and a gas pressure of 0.5 MPa was carried out using a self-developed large-scale coal and gas outburst simulation experimental system. A quantitative analysis was given based on the energy model. The results showed the following: (1) In the process of the coal and gas outburst, the main energy source originated from the elastic potential energy of the coal body and the gas internal energy. The main energy loss was used for coal crushing and throwing. (2) The outburst coal sample in this experiment had a mass of 18.094 kg, and the relative outburst intensity was 1.21%. Additionally, the farthest throwing distance of the outburst coal samples was 3.3 m away from the outburst hole wall. The distribution of the outburst coal sample decreased along the roadway, and the proportion of the coal sample grain size in each area first decreased and then increased with the decrease of the grain size. The coal samples with a grain size less than 0.2 mm after the outburst accounted for 6.34% of the mass of the total coal samples. (3) The elastic potential energy of the coal body accounted for 0.34% of the total outburst energy, while the gas internal energy accounted for 99.66%. It was verified that gas internal energy was the key energy source for the coal and gas outburst, and this internal energy was two orders of magnitude more than the elastic potential energy, playing a leading role in the outburst process. After the outburst initiation, most of the energy was consumed in coal crushing, which was in the same order of magnitude as the gas internal energy. Moreover, the energy losses due to friction, vibration, and sound during the outburst process comprised no more than 10% of the total energy. The research results can provide certain guidance for clarifying the mechanism of a coal and gas outburst and the quantitative analysis of outburst energy.

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