不同温度煤样孔隙结构特征分析

Analysis of Characteristics of Pore Structure of Coal Samples at Different Temperatures

不同种类的煤在不同温度下会呈现不同的孔隙结构特征。通过对不同煤样进行压汞试验,可以得出各种煤样的孔隙结构,在低温氧化过程中会遵循着一致的变化规律,即:在长焰煤煤岩体系中,以大孔和中孔为主,对长焰煤煤样的氧化反应贡献最大;气煤煤样中孔和过渡孔在整个氧化反应中变化较大,这2种类型的孔隙对气煤煤样的氧化反应贡献最大;在整个低温氧化过程中,各类型孔隙对1/3焦煤煤样的氧化反应均有所贡献;对肥煤煤样来说,过渡孔和微孔对氧化反应的进行贡献最大;焦煤煤样中过渡孔对氧化反应的贡献最大;贫煤煤样在整个氧化过程中,贡献最大的为过渡孔和微孔。

Different kinds of coal show different pore structure characteristics at different temperatures.By mercury injection experiment of different coal samples,the pore structure of a variety of coal samples can be obtained during the process of oxidation at low temperature,which follows a same change law,namely,in the long flame coal and rock,macropores and mesopores are the main,which contribute more to the long-flame coal oxidation reaction of coal samples.Mesopores and transitional pores have larger changes in the oxidation reaction in gas coal samples,the two types of pores contribute the most to the samples of gas coal during the process of oxidation reaction.For 1/3coking coal,all kinds of pores make contribution during oxidation reaction at low temperature.For fat coal samples,micropores and transitional pores contribute the most to oxidation reaction.For coking coal samples,transitional pores contribute the most to oxidation reaction.For lean coal,transitional pores and micro pores contribute the most to oxidation reaction.