Coal Mine Gases

Ammunition and explosives Coal mines, gas works, coking plant Crude oil processing/ petroleum storage (inch waste oil)... 

At present, mine gas is the major risks affecting coal mine production safety in China, the safety problems caused by the gas accounted for over 80% of coal mine production safety accidents, and its casualties account for 90% of all serious accidents casualties (Li Jing 2007), Especially the gas explosion accidents, which have caused worst human and economic losses. From 2004 to 2009, various national coal mine accidents caused more than 10 people died approximately 225 cases, 5280 people deaths, of which including 147 gas accidents, 3,667 people deaths, accounting for 65.3% and 69.5% respectively. After restoration efforts, the industry in recent years, coal mine production safety situation in China is a little better. But the coal mine production safety situation is still grim, the total accidents is still too large, serious accidents have occurred from time to time. Based on the statistical data of the state production safety supervision and Management Bureau in 2010 and other statistical data, in 2010 China s coal mine gas accident occurred 135 cases, killed 593 people... 

Chen Zhao 2012). Therefore, the coal mine gas disaster is one of the key factors to the coal industry production safety in china. Research shows that, in order to solve the gas disaster problem fundamentally, accurate prediction of mine gas emission is the key. ... 

In order to improve extraction rate and ensure safety, the new technology and new process must be developed. This paper mainly discusses the feasibility of compound perforating technology applied to the coal mine gas extraction. 

Yu Bu-fan, Wang You-an. Coal mine gas disasters prevention and use of technical manual [M]. Beijing China coal industry publishing house, 2000. 

Shining ou et al. 2001. Strategic Studies on prevention theory of coal mine gas disaster. China University of Mining and Technology press, Xuzhou. 

Because of many factors influencing coal mine gas emission (Guo et al., 2009, He et al., 2008, Zhu et al., 2007), such as natural factors (including geological structure, coal thickness, coal structure, buried depth, etc.), mining technology and various combination of factors, it is difficult to determine relationship of factors which are often of non-linear characteristics. 

Therefore, coal mine gas emission is a typical grey system (Tao et al., 2007, Wu et al., 2005) gray prediction model can be used to predict the gas concentration. 

Zhou, C.C. Huang, Y.P. 1995. Coal mine gas concentration in the work environment full state prediction. 

The cause of the underground coal mine gas explosion, one is electric leakage caused sparks gas explosion (Chen et al. 2010). Second is human body electrostatic sparks caused by gas explosion. Spark damage is the most common form of coal mine electric injury. Therefore in coal mine safety in production, we should seriously consider workers clothing, avoid clothing friction caused by static electricity, and reduce the gas explosion accidents. 

Analysis and statistics of workers unsafe acts in coal mine gas explosion... 

Yu Bufan 2000. Prevention of Coal-mine Gas Hazards and Utilization Manual. Beijing Coal Industry Press (in Chinese). 

Shen, B.-H. (2007) Liu see medium. Technical Measures, Coal Mine Gas Control in China. Journal of China Coal Society, 32, 673-679. 

Xie, Z.-P. (2004) Research on Coal Mine Gas Flow Theory and Inverse Problems. Master Thesis of China University of Mining and Technology (China), 6, 112-114. 

Mine gas is one of the important hidden trouble to influence coal mine safety production (Shi et al., 2006), the abnormal gas emission will usually lead to coal mine gas accident. Gas emission is affected by many factors (Zhu et al., 2007 Guo et al., 2009 He et al., 2008), the judgment of abnormal gas emission is not only important to the real-time monitor of the gas concentration (Zhang et al., 2012), but also important to the discrimination of the reason of abnormal gas emission. Therefore, the dynamic evaluation of gas emission hazard danger level combined with gas monitoring data plays an important role on gas prevention and gas disaster control when it does dynamic early-warning of coal face gas emission (Lv et al., 2006 Gong et al., 2012). 

Guo Hai. 2012. Research on Identifying and Early Warning Technology of Coal Mine Gas and Fire Hazards. Doctoral dissertation, China University of Mining and Technology(Bei Jing), Bei Jing. 

Coal mine gas (called Coal bed Gas) is a kind of associated gas from the coal seam in coal mine exploitation process in different forms, which is one of the main reasons of the coal mine accident. As the first fatal factor in coal mine, the gas accident not only causes a large number of casualties and huge economic losses, and imperils the safety of coal mine production seriously once it occurs. Gas concerns the major issues of environmental pollution, the greenhouse effect and the future of new energy. It can be used after recovered rapidly if the coal mine gas develops, storages and transports high-efficiently in moderate environment. Meanwhile it will be reduced that the cost, the hidden safety trouble and the gas emission pollution to the environment. Thus it is badly in need of a new type of gas utilization technology to make up for the current technical defects. Hydrate method is an optional way. 

Gas hydrate is a similar ice and non-stoichio-metric crystalline solid composed of water and coal mine gas (CH, CjH, Nj, Oj, CO etc.) under a certain temperature and pressure conditions. Gas... 

He Xue-qiu, Shen Bao-hong 2009. Coal mine gas control technology and engineering practice[M]. China University of Mining Press, 46-257. 

Yu, B.F. 2005. Coal Mine Gas Disaster Prevention and Utilization Technology Handbook. Beijing China Coal Industry Publishing House. 

BSR (Bacterial Sulfate Reduction), TSR (Thermochemical Sulfate Reduction) and magmatism are the main causes of HjS gas formation in coal mine gas (Liu et al. 2011). HjS is the intermediate... 

Coal industries produce large amount of energy, but also are energy-hungry. Carbon emission sources in China s coal mines are mainly three First, the coal mine gas emissions, more than 15 billion mVa (equivalent of 225 million t/a carbon dioxide), which destruction of the ozone layer... 

In the coal-mining industry, more than 300 mines are operated in three coal-mining regions Ukraine produces only 5 5 million tons of its own oil, but the ramified network of oil pipelines supports the operation of 10 petroleum plants. The Ukrainian gas pipelines transport the Russian gas to Central and Western Europe. 

Among common areas where explosion can occur are coal mines, petrochemical plants, chemical plants, paint shops, grain handling industry, etc. Explosive limits for gases and vapors are expressed as percentages (% ), and may be defined as minimum and maximum concentrations of a flammable gas or vapor between which ignition occur. Concentrations below the lower explosive limit (LEL) are too lean to burn, while those above the upper explosive limit (UEL) are too rich. Table 7.8 lists explosive limits for some common gases. 

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