Characteristics and Mechanisms of Rock Magnetic Enhancement in Underground Coal Spontaneous Combustion Areas-Examples of the Wuda Coal Mine of Inner Mongolia and Rujigou Coal Mine in Ningxia

2013 ◽  
Vol 56 (6) ◽  
pp. 777-788
Author(s):  
XIONG Sheng-Qing ◽  
YU Chang-Chun
Keyword(s):  
Coal Mine ◽  
Inner Mongolia ◽  
Spontaneous Combustion ◽  
Coal Spontaneous Combustion ◽  
Magnetic Enhancement

scholarly journals Disastrous Mechanism and Concentration Distribution of Gas Migration in Fully Mechanized Caving Stope in Wuyang Coal Mine

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Li Chong ◽  
He Sifeng ◽  
Xu Zhijun
Keyword(s):  
Coal Mine ◽  
Concentration Distribution ◽  
Spontaneous Combustion ◽  
Concentration Field ◽  
Gas Migration ◽  
Coal Spontaneous Combustion ◽  
Gas Drainage ◽  
Gas Concentration ◽  
Research Results ◽  
Working Face

The overrunning disaster of harmful gas tends to occur in the working face in thick coal seam with high gas concentration, as the fully mechanized caving stope has the characteristics of high mining intensity, high remnant coal, and high gas content. Therefore, the disastrous mechanism and concentration distribution of gas migration in fully mechanized caving stope are the theoretical basis for gas control scheme. Based on the 7607 working face in Wuyang coal mine, the gas emission quantity in working face is comprehensively analyzed by field measurement in this paper. The gas leakage field, oxygen concentration field, and gas concentration field in 7607 working face are simulated by establishing the equal proportional numerical model. Due to the increase of air leakage in working face caused by the high alley pumping drainage, the risk of coal spontaneous combustion is also analyzed, when gas extraction in goaf is carried out. The research results show that the gas drainage technology in high drainage roadway has a remarkable effect on the gas overrunning phenomenon. The gas concentration near the upper corner of the working surface has been reduced from 0.7%-1% to 0.5%. At the same time, it is necessary to pay attention to the risk of coal spontaneous combustion in the goaf for gas drainage in the high drainage roadway. The width of the oxidation zone in the goaf is about 25 m deeper than that before the drainage. Research results provide the references for gas control technology and coal spontaneous combustion prevention in similar working faces.

Studied on Indicator Gases of Coal Based on BP Neural Network Forecasting System

2014 ◽  
Vol 685 ◽  
pp. 259-262 ◽  
Author(s):  
Bing Bian ◽  
Zhi Jian Liu ◽  
Wei Zhang
Keyword(s):  
Neural Network ◽  
Coal Mine ◽  
Bp Neural Network ◽  
Spontaneous Combustion ◽  
Coal Spontaneous Combustion ◽  
The Neural Network ◽  
Forecasting System

In order to forecast coal spontaneous combustion, take advantage of BP neural network. The date is recorded from one coal mine of Donghuantuo. The input of the neural network is the concentration of CO, CO2 and CH4 in different temperature and use CH4-to-CO, O2-to-CO2 ratio. In this way, the influence of the wind will be little. After trained, the network can show 0 or 1 which represent fire or not. After trained 43 times, the error is lower than 0.000 1. It proves that BP neural network can deal with the date of coal mine. What’s more, BP neural network has huge advantages.

Effects of Drying Process on Lignite Quality

2014 ◽  
Vol 986-987 ◽  
pp. 127-130
Author(s):  
Wen Jiao Tang ◽  
Shou Yu Zhang ◽  
Jian Xun Dong ◽  
Xi Guo ◽  
Ai Xia Dong ◽  
...  
Keyword(s):  
High Temperature ◽  
Inner Mongolia ◽  
Spontaneous Combustion ◽  
Adsorbed Oxygen ◽  
Drying Process ◽  
Coal Spontaneous Combustion ◽  
Industrial Analyzer ◽  
High Temperature Drying ◽  
Proximate Analyses

The drying experiments of three typical kinds of Inner Mongolia lignite were conducted on a self-designed apparatus. The proximate analyses and oxygen adsorbing capacities of all the samples were analyzed on an industrial analyzer and a coal spontaneous combustion tendency tester. The results show that the treated samples show no apparent changes in their properties compared to the original lignite and no pyrolysis or combustion phenomenon occurs in the drying process. It is also observed that the oxygen adsorbing capacity of the dewatered sample is lower than that of the original lignite. Especially the oxygen adsorbing capacity of the lignite sample undergoing high-temperature drying process decreases significantly. Considering the amount of adsorbed oxygen can reflect the spontaneous combustion tendency of coal to a certain extent, the spontaneous combustion tendency of the treated lignite decreases.

Effect Analysis of Nitrogen Injection on the Variation of “Oxidation Zone” in Coal Mine Gob Based on Numerical Simulation

2016 ◽  
Vol 9 (1) ◽  
pp. 47-54
Author(s):  
Jing Shen ◽  
Mingran Chang
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Heat Dissipation ◽  
Spontaneous Combustion ◽  
Oxidation Zone ◽  
Effect Analysis ◽  
Mine Fire ◽  
Nitrogen Injection ◽  
The Difference ◽  
Residual Coal

One of the main reasons for coal mine fire is spontaneous combustion of residual coal in gob. As the difference of compaction degree of coal and rock, the underground gob can be considered as a porous medium and divided into “three zones” in accordance with the criteria. The “three zones” are “heat dissipation zone”, “oxidation zone” and “choking zone”, respectively. Temperature programming experiments are taken and numerical simulation with obtained experimental data is utilized to analyze the distribution of “three zones” in this paper. Different width and depth of “oxidation zone” are obtained when the inlet air velocity is changed. As the nitrogen injection has inhibition effect on spontaneous combustion of residual coal in gob, nitrogen is injected into the gob. The widths of “oxidation zone” are compared before and after nitrogen injection. And ultimately the optimum location and volume of nitrogen injection are found out.

Investigation on the suppression characteristic of deoxidization gel foam on coal spontaneous combustion

2021 ◽  
Author(s):  
Xin‐xiao Lu ◽  
Xue Xue ◽  
Cheng‐yan Wang ◽  
Guo‐yu Shi ◽  
Yun Xing ◽  
...  
Keyword(s):  
Spontaneous Combustion ◽  
Coal Spontaneous Combustion

scholarly journals Are Ionic Liquids Suitable for Suppressing Coal Spontaneous Combustion?

ACS Omega ◽  
2021 ◽  
Vol 6 (10) ◽  
pp. 6681-6690
Author(s):  
Xuanxuan Huang ◽  
Yongliang Xu ◽  
Yan Wang ◽  
Yao Li ◽  
Lanyun Wang ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Spontaneous Combustion ◽  
Coal Spontaneous Combustion
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