电脉冲对无烟煤官能团及甲烷吸附特性影响研究
Effect of electric pulse on functional groups and methane adsorption characteristics of anthracite coal
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摘要: 利用电脉冲致裂煤体增渗实验系统，对贵州轿子山煤矿无烟煤进行电脉冲致裂实验，并结合工业分析、傅里叶红外光谱测试和等温吸附实验方法，研究了不同击穿电压条件下电脉冲致裂煤体的电流峰值、煤体官能团结构和吸附甲烷能力的演化规律。结果表明：煤样电脉冲击穿煤体的过程主要经历了热击穿、电击穿和残余阶段，同时，击穿煤样的电流峰值随着击穿电压的升高而增大，且呈现指数化趋势；电脉冲击穿煤样的官能团结构发生明显变化，CH吸收峰随着击穿电压的增加而升高，C=C、-CH3、-CH2、-OH吸收峰随击穿电压的提高而降低；电脉冲击穿煤样的甲烷极限吸附量a值都比原煤低，煤样吸附常数b值随击穿电压增加呈现出波动式的变化，表明电脉冲击穿煤体后，明显降低了煤样对甲烷的吸附能力，有利于煤层气的高效开采。Abstract: The experiment of electric pulse cracking of anthracite coal from Jiaozishan Coal Mine in Guizhou Province was carried out by using the electric pulse experimental system of fracturing and enhancing permeability of coal. Combined with industrial analysis, Fourier infrared spectroscopy and isothermal adsorption experimental methods, the changes of peak current, coal functional group structure and methane adsorption capacity under different breakdown voltages were studied. The results show that the process of electrical pulse breakdown of coal samples mainly goes through thermal breakdown, electrical breakdown and residual stages. Meanwhile, the peak current of breakdown coal samples increases with the increase of breakdown voltage and presents an exponential trend. The functional group structure of coal treated with electric pulse changes obviously, the CH absorption peak increases with the increase of breakdown voltage, while the absorption peaks of C=C, -CH3, -CH2 and -OH decrease. The limit adsorption capacity a value of high-voltage pulse impact coal is lower than that of raw coal, and the adsorption constant b value fluctuates with the increase of breakdown voltage, indicating that after coal treated with electric pulse, the adsorption capacity of coal is significantly reduced, which is conducive to the efficient exploitation of coalbed methane.
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