氢气的生成及对瓦斯爆炸的影响

Effects of Hydrogen Production on Gas Explosion

利用痕量氢气测定方法，对煤氧化过程产生的氢气进行测定，借助20L球形爆炸实验装置，研究氢气对瓦斯爆炸特性的影响．实验结果表明当煤温升高到200～250℃时就可以检测到氢气，之后随温度升高氢气浓度呈指数上升，当煤温升至280℃，φ（H2）最高可达0．479／5．煤样粒径对氢气的生成影响不大，而煤种对氢气的产生却有较大的影响．煤变质程度越低，析出氢气的温度也越低，析出氢气量越多．氢气的存在会大幅度降低甲烷的爆炸下限，并增加甲烷的爆炸威力．φ（H2）为0．5％时，φ（CH4）为2．4％的混合气体就会发生爆炸．

Using a trace analysis method the hydrogen concentrations produced during coal oxidation was measured. The influence of hydrogen on the explosion characteristics of gas in a mine was tested using a 20 L global explosion installation. The results show that hydrogen will be produced when the temperature of the coal increases to 200-250℃. At this point the concentration of hydrogen begins to increase exponentially. The hydrogen concentration becomes as high as 0.47% when the temperature rises to 280℃. The influence of coal type on hydrogen production is significant, but there is no obvious effect of coal particle size. The lower the metamorphism, the lower the temperature at which coal begins to produce hydrogen and the more hydrogen that is produced. The existence of hydrogen can decrease the lower explosion limit of methane and can increase the explosion pressure. A 2.4% methane mixture containing 0.5 hydrogen will explode.