scholarly journals Experimental Study on Blasting Energy Distribution and Utilization Efficiency Using Water Jet Test

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5340
Author(s):  
Chenxi Ding ◽  
Renshu Yang ◽  
Zhen Lei ◽  
Cheng Chen ◽  
Changda Zheng
Keyword(s):  
Experimental Study ◽  
Energy Distribution ◽  
Stress Wave ◽  
Distribution Ratio ◽  
Water Jet ◽  
Utilization Efficiency ◽  
Lead Azide ◽  
Constraint Condition ◽  
Effective Utilization ◽  
Main Motive

The blasting stress wave and blasting gas generated by explosive blasting are the two main motive powers of rock fragmentation. An experimental method based on water jet test is used to study the energy distribution ratio of blasting stress wave and blasting gas; the utilization efficiency of blasting energy under different borehole constraint conditions is also analyzed. It proves that the blasting stress wave does not cause the water jet, and the blasting gas is the only power of the water column jet. The results show that the energy of the blasting gas and blasting stress wave respectively account for about 64% and 36% of the total energy generated by the explosion of lead azide. The utilization efficiency of the blasting gas energy under strong, medium, and weak constraint conditions is 100%, 80%, and 52%, respectively. The borehole constraint condition is crucial for the effective utilization of blasting energy.

Rapid Excavation Technical Research of Blasting Mining Face in Liangzhuang Mine

2014 ◽  
Vol 580-583 ◽  
pp. 2550-2553
Author(s):  
Zheng Bin Yan ◽  
Xiao Xu ◽  
Tao Tao Li ◽  
Shang Wu ◽  
Shi Yan Ma
Keyword(s):  
Stress Wave ◽  
Distribution Ratio ◽  
Peak Pressure ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Explosion Energy ◽  
Working Face ◽  
Rapid Excavation ◽  
Mining Face ◽  
Air Column

The paper studied the driving blasting mechanism and blasting parameters in working face, in order to improve the advance rate of blasting mining face in Liangzhuang mine. The research results show that taking the air column interval charging structure can reduce the peak pressure on the borehole wall, change the distribution ratio of explosion energy, decrease the smash district radius and increase the effect of secondary stress wave. To improve the energy utilization efficiency was improved in this structure, the consumption was reduced by 35.3%, the cyclical footage from 0.8m to 1.2m and crushing effect is obvious.

Research status of microwave-assisted reduction technology of pyrolusite

2020 ◽  
Vol 07 ◽  
Author(s):  
Li Qiannan ◽  
Ling Yeqing ◽  
Zheng Hewen ◽  
Yang Zhi
Keyword(s):  
Metallurgical Industry ◽  
Raw Material ◽  
Utilization Efficiency ◽  
Low Grade ◽  
Manganese Ore ◽  
Effective Utilization ◽  
Research Status ◽  
Strategic Position ◽  
Research Intensity ◽  
Stable Development

: Manganese ore is an important metallurgical raw material that holds an important strategic position in the national economy of China. However, the grade of manganese ore in the country is mostly low, and the utilization efficiency of lowgrade manganese ore resources is low, which seriously restrict the healthy and stable development of China’s metallurgical industry. As a new green heating method, microwave is expected to address the problems of conventional methods and realize the effective utilization of low-grade manganese ore. In this paper, the research status of the microwave composite reduction of pyrolusite in recent years is reviewed. Microwave plays an important role in metallurgy, and it is the current direction pursued to improve the research intensity of microwave heating and extend it to actual industrial processes.

New Application of Actuator-Driven Pulsed Water Jet for Spinal Cord Dissection: An Experimental Study in Pigs

2016 ◽  
Vol 78 (02) ◽  
pp. 137-143
Author(s):  
Jia Wenting ◽  
Atsuhiro Nakagawa ◽  
Hidenori Endo ◽  
Yuto Sagae ◽  
Masaki Iwasaki ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Experimental Study ◽  
Water Jet ◽  
Pulsed Water Jet

Experimental Study of the Low-Pressure Water Jet Assisted Laser Processing of W6Mo5Cr4V2 High-Speed Steel

Applied laser ◽  
2013 ◽  
Vol 33 (2) ◽  
pp. 181-185
Author(s):  
王金华 Wang Jinhua ◽  
袁根福 Yuan Genfu ◽  
逄志伟 Pang Zhiwei ◽  
陈春映 Chen Chunying
Keyword(s):  
Experimental Study ◽  
Laser Processing ◽  
High Speed ◽  
High Speed Steel ◽  
Low Pressure ◽  
Water Jet ◽  
Pressure Water

Experimental Study about Effect of Water-Jet to Laser Etching of Crystal Silicon

Applied laser ◽  
2014 ◽  
Vol 34 (6) ◽  
pp. 557-561
Author(s):  
张崇天 Zhang Chongtian ◽  
袁根福 Yuan Genfu ◽  
陈雪辉 Chen Xuehui ◽  
张程 Zhang Cheng ◽  
王海云 Wang Haiyun
Keyword(s):  
Experimental Study ◽  
Water Jet ◽  
Laser Etching ◽  
Crystal Silicon ◽  
Effect Of Water

scholarly journals Experimental Study on the Fractal Features and Permeability Characteristics of Low Metamorphic Coal Pore Structure under Thermal Damage

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Zhen Liu ◽  
Mingrui Zhang ◽  
Shijian Yu ◽  
Lin Xin ◽  
Gang Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pore Structure ◽  
Coal Gasification ◽  
Thermal Damage ◽  
Fractal Model ◽  
Utilization Efficiency ◽  
Heating Process ◽  
Underground Coal Gasification ◽  
External Temperature ◽  
Permeability Characteristics

Underground coal gasification and exploitation of geothermal mine resources can effectively improve coal conversion and utilization efficiency, and the basic theory of the above technologies generally relies on the change law of the coal pore structure under thermal damage. Therefore, the influence mechanism of the development of the coal pore structure under thermal damage is analyzed by the nuclear magnetic resonance experiment, and the temperature-permeability fractal model is created. The results show that compared with microtransitional pores, the volume of meso-macropores in the coal body is more susceptible to an increase in temperature, which was most obvious at 200-300°C. During the heating process, the measured fractal dimension based on the T2 spectral distribution is between 2 and 3, indicating that the fractal characteristics did not disappear upon a change in external temperature. The temperature has a certain negative correlation with DmNMR, DMNMR, and DNMR, indicating that the complexity of the pore structure of the coal body decreased gradually with the increase of the temperature. Compared with the permeability calculated based on the theoretical permeability fractal model, the permeability obtained from the temperature-permeability fractal model has a similar increasing trend as the permeability measured by the NMR experiment when the temperature increases. The experimental study on pore structure and permeability characteristics of the low metamorphic coal under thermal damage provides a scientific theory for underground coal gasification and geothermal exploitation.

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