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Effect of CO_2 on explosion limits of flammable gases in goafs

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Mining Science and Technology 2010年第2期20卷 193-197页

作者： MA, Li XIAO, Yang DENG, Jun WANG, Qiuhong college of energy science & engineering xi'an university of science & technologyxi'an 710054 china key laboratory of western mine exploitation and hazard prevention ministry of educationxi'an 710054 college of energy science & engineering xi'an university of science & technologyxi'an 710054 china

In order to reduce the number of accidents due to explosions of flammable gases in the goaf of coalmines,the conditions for explosion of flammable gases and their explosion limits,affected to a considerable extent by CO2,are *** the use of our experimental equipment suitable for the study of explosion of polybasic explosive gas mixtures,we investigated the effect of CH4/H2=10/1 and CH4/C2H4=10/1 gases mixed with CO2 on their explosion *** results indicate that after adding CO2,the explosion limit of the CH4/H2(or C2H4) =10/1 gas mixtures decreased markedly with increasing amounts of *** the amount of CO2 exceeded 25%,the CH4/C2H4=10/1 flammable gas mixture did not lead to *** results were obtained when the amount of CO2 exceeded 23% in the CH4/H2=10/1 flammable gas *** also compared the explosion limits and the explosion suppression effect of N2 or CO2 on the explosion limits of the CH4+CO and CH4+C2H4 dual explosive gas *** with the increases in the amounts of CO2 or N2,the area of the explosion limits of gas mixtures *** the same conditions,the explosion suppression effect of CO2 was greater than that of ***2 has clearly the better suppression effect on the explosion of flammable gases in goafs.

关键词： CO2 flammable gases explosion limits

Theoretical and Experimental Study of explosion limits and the Inhibition of Flammable Refrigerants

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Journal of Software Engineering and Applications 2016年第10期9卷 501-515页

作者： Guansan Tian Xingquan Li Yunfeng Gao Fengxia Zhang School of Thermal Energy Engineering Shandong Jianzhu University Jinan China Key Laboratory of Renewable Energy Utilization Technology in Building of National Education Ministry Shandong Jianzhu University Jinan China Shandong Provincial Key Laboratory of Building Energy-Saving Technology Shandong Jianzhu University Jinan China

In this study, we analyze factors affecting the explosion limits of flammable refrigerants. We conclude that any method used for measuring flammable refrigerant explosion limits has its conditional restrictions. Flammable refrigerants in the atmosphere can also explode under certain conditions, when the concentration is approaching the explosion limits. An experimental study on the explosion limits of six kinds of flammable refrigerants is carried out with a mixture of refrigerant and combustible refrigerant, which has a similar effect to a flame retardant. An experimental apparatus was designed to test the explosion limits of mixtures made from three different nonflammable refrigerants and six different flammable refrigerants. Two practical models were developed to estimate the critical concentration for inhibiting explosion of refrigerant mixtures: one was made up of two flammable components with one nonflammable component, and the second was made up of one flammable component with two nonflammable components.

关键词： Flammable Refrigerants explosion limits Impact Factors Inhibition

Inhibiting effect of Al(OH)_3 and Mg(OH)_2 dust on the explosions of methane-air mixtures in closed vessel

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Science China(Technological Sciences) 2012年第5期55卷 1371-1375页

作者： WANG QiuHong WEN Hu WANG QingSong SUN JinHua State Key Laboratory of Fire Seience University of Science and Technology of ChinaHeJei 230026China School of Energy Engineering Xi'an University of Science and TechnologyXi'an 710054China

The inhibiting effect of AI（OH）3 and Mg（OH）2 dust on explosion of methane-air mixtures was investigated by means of explosion parameter tests in a 20-liter closed vessel. The influences of varying methane concentration and dust concentration on explosion parameters were characterized based on the experimental data to determine the maximum explosion pressure, maximum rate of pressure rise, lower explosion limits and upper explosion limits. The inhibiting mechanisms of these kinds of dust were analyzed as well. The investigations indicate that AI（OH）3 and Mg（OH）2 dust can be used as inhibitors to prevent meth- ane explosion, however, their inhibiting effects are less than those of inert gas such as N2 and CO2 in that their dust can weaken the methane explosion but cannot totally eliminate it. The tests show that all of the explosion parameters with dust additives are strongly dependent on methane/air ratio and dust concentration, and AI（OH）3 dust has better performance than Mg（OH）2 dust in inhibiting methane explosion. The average percentage decreases of maximum explosion pressure and maximum rate of pressure rise with AI（OH）3 dust are 11.08% and 66.15%, respectively. Experiments also showed that there is a special phe- nomenon when methane explosion is inhibited by AI（OH）3 and Mg（OH）2 dust, in which is that during the process of explosion the maximum explosion pressure value first decreases then increases as dust concentration increases. The best dust concentrations to inhibit the explosion are 250 g/m3 with methane/air ratio at 9.5%, and 200 g/m3 with methane/air ratio at 7%. It is suggested that water vapor produced by the thermal decomposition of metal hydroxides makes the particles of descending dust combine, resulting in a decrease of the real dust concentration in the vessel. Water vapor also is the major cause of another phenomenon that the LEL curve and the UEL curve never meet with the increase of gas concentration.

关键词： explosion inhibition explosion pressure explosion limits dust metal hydroxides

Experimental study on explosion limit of M15 methanol-gasoline mixture

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Journal of Measurement Science and Instrumentation 2021年第4期12卷 390-395页

作者： TAN Yingxin SUN Yanlong ZHANG Huarong LIU Haihong RAO Yonghong School of Environment and Safety Engineering North University of China Taiyuan 030051 China PLA Unit 32382 Beijing 100072 China

The explosion characteristics of M15 methanol-gasoline mixture was experimental test by using FRTA explosion limit *** effect of temperature on the explosion area of the sample was *** results show that the lower explosion limit of M15 methanol-gasoline mixture is 1.716%and the upper explosion limit is 11.451%at the initial temperature of 80℃.The lower explosion limit of M15 methanol-gasoline is in the range of 1.711%-1.760%with the initial temperature from 25℃to 100℃,and the upper explosion limit of the sample changes between 11.253%and 11.451%.Considering experimental error and precision,it can be approximated that the temperature has little influence on the explosion area of M15 methanol-gasoline mixture.

关键词： M15 methanol-gasoline mixture explosion limits vapor explosion gas explosion