Experimental study on the variation law of coal temperature during excavation in coal mines

2013 ◽  
Vol 19 (2) ◽  
pp. 133-135
Author(s):  
Yi-Shan Pan ◽  
Lian-Man Xu ◽  
Zhong-Hua Li ◽  
Guo-Zhen Li
Keyword(s):  
Experimental Study ◽  
Coal Mines ◽  
Coal Temperature

scholarly journals Research on Temperature Variation during Coal and Gas Outbursts: Implications for Outburst Prediction in Coal Mines

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5526
Author(s):  
Chaolin Zhang ◽  
Enyuan Wang ◽  
Jiang Xu ◽  
Shoujian Peng
Keyword(s):  
Large Scale ◽  
Coal Mines ◽  
Prediction Method ◽  
Coal Temperature ◽  
Local Experience ◽  
Operation Process ◽  
Coal And Gas Outbursts ◽  
Short Time ◽  
Dynamic Phenomena ◽  
Main Factor

Coal and gas outbursts are among the most severe disasters threatening the safety of coal mines around the world. They are dynamic phenomena characterized by large quantities of coal and gas ejected from working faces within a short time. Numerous researchers have conducted studies on outburst prediction, and a variety of indices have been developed to this end. However, these indices are usually empirical or based on local experience, and the accurate prediction of outbursts is not feasible due to the complicated mechanisms of outbursts. This study conducts outburst experiments using large-scale multifunctional equipment developed in the laboratory to develop a more robust outburst prediction method. In this study, the coal temperature during the outburst process was monitored using temperature sensors. The results show that the coal temperature decreased rapidly as the outburst progressed. Meanwhile, the coal temperature in locations far from the outburst mouth increased. The coal broken in the stress concentration state is the main factor causing the abnormal temperature rise. The discovery of these phenomena lays a theoretical foundation and provides an experimental basis for an effective outburst prediction method. An outburst prediction method based on monitoring temperature was proposed, and has a simpler and faster operation process and is not easily disturbed by coal mining activities. What is more, the critical values of coal temperature rises or temperature gradients can be flexibly adjusted according to the actual situations of different coal mines to predict outbursts more effectively and accurately.

scholarly journals Experimental study on ventilation supply–demand matching to dispense the stope gas disaster risk of coal mines

2020 ◽  
Vol 11 (1) ◽  
pp. 1299-1318 ◽  
Author(s):  
Xiaodong Pei ◽  
Kai Wang ◽  
Shuguang Jiang ◽  
Zhengyan Wu ◽  
Hao Shao
Keyword(s):  
Experimental Study ◽  
Coal Mines ◽  
Disaster Risk ◽  
Gas Disaster

Experimental Study on Pipe Strength and Field Performance of Pipe Jacking TBM in Deep-Buried Coal Mines

2021 ◽  
Author(s):  
Bin Tang ◽  
Zhenhua Wang ◽  
Hua Cheng ◽  
Mathias Yeboah ◽  
Yongzhi Tang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Coal Mines ◽  
Field Performance ◽  
Pipe Jacking

scholarly journals A Novel Method for Borehole Blockage Removal and Experimental Study on a Hydraulic Self-Propelled Nozzle in Underground Coal Mines

Energies ◽  
2016 ◽  
Vol 9 (9) ◽  
pp. 698 ◽  
Author(s):  
Zhaolong Ge ◽  
Kai Deng ◽  
Yiyu Lu ◽  
Liang Cheng ◽  
Shaojie Zuo ◽  
...  
Keyword(s):  
Experimental Study ◽  
Coal Mines ◽  
Underground Coal Mines ◽  
Novel Method

Experimental study for reducing gas inflow by use of thin spray-on liners in underground coal mines

2012 ◽  
Vol 121 (2) ◽  
pp. 61-67 ◽  
Author(s):  
F Hussain ◽  
S Saydam ◽  
R Mitra ◽  
Y Cinar
Keyword(s):  
Experimental Study ◽  
Coal Mines ◽  
Reducing Gas ◽  
Underground Coal Mines

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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