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Chen, Liang
- Performance of Discharge in Two Phase Mixture of Air-Droplet
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Authors
Affiliations
1 Jiangxi University of Science and Technology, Ganzhou, CN
1 Jiangxi University of Science and Technology, Ganzhou, CN
Source
Nature Environment and Pollution Technology, Vol 15, No 1 (2016), Pagination: 343-348Abstract
The influence performances in two phase mixture of air-droplet discharge are analysed in the paper based on the gaseous discharge unit process, and the mechanism in two phase mixture of air-droplet discharge is researched. The research obtains the result not only that the gas spray electrically charged effect is to cause the spatial free electron number to reduce greatly, while is to increase an amount of ions, and discharge phenomena is weakened, but the second voltage increased, intensity of electric field aggrandized too. But also that the free electronic collision frequency in two phase mixture of air-droplet increases every second, and that the collision ionization energy can be reduced, the adhesion coefficient of collision ionization increases, and that ion effective adhesion coefficient increases, and that water mist to the electronic affinity is higher and migration rate of iron is lower. So these factors contribute to the aerosol mixture discharged with a higher voltage, and it is favourable to improve dust performance.Keywords
Two Phase Mixture of Air-Droplet, Collision Ionization, Adhesion Coefficient, Charged Particle.Full Text
- Study on the Critical Value of Gas Content in Regional Prediction of Coal and Gas Outburst Based on Gas Adsorption and Desorption Experiment
Abstract Views :141 |
PDF Views:0
Authors
Affiliations
1 China University of Mining and Technology Beijing, Beijing 100 083, CN
2 Mine Safety Technology Branch of China Coal Research Institute, Beijing, 100 083, CN
3 Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550 081, CN
1 China University of Mining and Technology Beijing, Beijing 100 083, CN
2 Mine Safety Technology Branch of China Coal Research Institute, Beijing, 100 083, CN
3 Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550 081, CN
Source
Journal of Mines, Metals and Fuels, Vol 65, No 9 (2017), Pagination: 473-478Abstract
Owing to the gas content is an important indicator in coal and gas outburst prevention, we set up a gas adsorption and desorption experimental system with temperature controlling, and draw out a method combining with experimental analysis, theoretical calculation and project inspection to determine the critical value of gas content in coal and gas outburst prediction. This paper takes D6 coal seam in Pingdingshan No.1 coal mine as an example, sets up the powder function equations among the gas content, gas pressure and gas desorption of drill-cuttings (Δh2 ). The gas content minimum is calculated as 5.04m3 /t as the gas pressure and Δh2 reach their critical values respectively, which is lower than the critical value of gas content (5.19m3 /t) determined by Langmuir formula, considering a deformed coal with a thickness of 0.6m exists in D6 coal seam, the critical value of gas content is determined as 5.0 m3 /t finally, and its accuracy is proved well in engineering application.Keywords
Coal and Gas Outburst, Critical Value of Gas Content, Gas Adsorption-desorption Experiment, Basic Gas Parameters, Deformed Coal.
- Non-linear dynamic support optimization method for non-uniform pressure circular tunnel considering the effect of damage
Abstract Views :80 |
PDF Views:0
Authors
Affiliations
1 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, CN
2 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, School of Mechanics and Civil Engineering, China University of Mining & Technology, 221116 Xuzhou, China, CN
1 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, CN
2 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, School of Mechanics and Civil Engineering, China University of Mining & Technology, 221116 Xuzhou, China, CN
Source
Journal of Mines, Metals and Fuels, Vol 67, No 09 (2019), Pagination: 403-415Abstract
Based on non-linear Hoek-Brown criterion, a new approximate solution of deformation and plastic zone radius of circular tunnel is deduced under non-uniform pressure. In the plastic region, three different, Young’s modulus attenuation models are applied to solve the plastic zone deformation. The results show that the lateral pressure coefficient (LPC), dilatancy coefficient, buried depth and Young’s modulus attenuation exert important effects on the surrounding rock state. Under the influence of LPC, the radius and displacement of plastic zone show non-uniform variation; then, the maximum value of the ground response curve is gradually shifted from the side to the roof. With the burial depth and dilatancy coefficient increase, the surface displacement presents the non-linear increase characteristic. Besides, the influence of Young’s modulus on the plastic zone deformation is not only related to its attenuation model, but also closely related to the surface location and LPC of surrounding rock. Based on the above research, a non-linear dynamic support optimization method for non-uniform pressure circular tunnel is proposed.Keywords
Elastoplastic solution; circular tunnel; nonlinear Hoek-Brown criterion; lateral pressure coefficient; ground response curveReferences
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