多维气相色谱法测定生物质燃气组分含量

Determination of Components Content in Biomass Gas by Multidimensional Gas Chromatography

关于生物质燃气含量的检测方法未见报道,因此建立分析生物质燃气组分含量的多维气相色谱法。首先,将4根不同固定相的色谱柱串、并联,生物质燃气试样先经SE-30色谱柱进行预分离,当C_(3)流出色谱柱后,反吹SE-30色谱柱,将C_(4)及以上的重组分反吹出去。然后,轻组分继续在HQ和5A分子筛色谱柱中进一步分离,当CO_(2)流出HQ色谱柱前,切换流路,使CO_(2)不进入5A分子筛色谱柱,而O_(2)、N_(2)、CH_(4)及CO等组分在5A分子筛色谱柱中继续分离。与此同时,C4及以上重组分在另一路载气中经MEGA-1色谱柱分离。实验结果表明,6次重复测定的相对标准偏差小于2.60%,检出限小于0.04%,方法准确可靠,适合测定生物质燃气中各组分含量。

There is no report on the detection method for components and content of biomass gas. A novel multidimensional gas chromatography method was established to study the components and content of biomass gas. In this method, four chromatographic columns with different stationary phases were connected in series or in parallel. The biomass gas sample was pre-separated by a SE-30 chromatographic column. After C_(3) component was flowed out of the chromatographic column, C_(4) and heavier components were purged by blown back the SE-30 chromatographic column. The light components were continued to be further separated in the HQ and 5 A molecular sieve chromatographic columns. After CO_(2) flowed out of the HQ chromatographic column, the flow path was switched off so that the CO2 could not pass through the 5 A molecular sieve chromatographic column and the mixed gas of O_(2), N_(2), CH_(4) and CO entered into the 5 A molecular sieve chromatographic column for the further separation. On the other hand, C_(4) and heavier components were separated by MEGA-1 chromatographic column in another carrier gas path. The results showed that the relative standard deviation of six repeated determinations was less than2.60 %, and the detection limit of each component was less than 0.04 %. This method was accurate and reliable, which is suitable for the determination of components in biomass gas.