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长期以来,煤气中各个组分的体积百分含量是用经典的气体分析器测定的,该方法操作麻烦、分析时间长、样品用量多。用气相色谱仪分析煤气的组成,其分离效能高、分析速度快、样品用量少。目前,国外采用双气路气相色谱仪,用5A(或13x)分子筛和porapak两种固定相,一次进样测定煤气中的各个组分。据介绍,用氦气为载气时,5A分子筛能分离煤气中的H_2、O_2、N_2、CO、CH_4;porapak能分离CO_2、C_2H_4、C_2H_6等组分。这种气相色谱仪的结构复杂,不仅要装置换向阀门,而且还须自动控制。国内,一般都采用双气路气相色谱仪和两次进样的方法分析煤气中各个组分,该法不仅需要双气路气相色谱仪,而且两次进样会给分析数据带来较大的误差。
For a long time, the volume percentage of each component in the gas was measured by a classical gas analyzer. The method was troublesome to operate, the analysis time was long, and the amount of the sample was large. Analysis of gas composition by gas chromatography, the separation of high efficiency, fast analysis, sample dosage less. At present, foreign countries using dual-gas GC, with 5A (or 13x) molecular sieve and porapak two stationary phases, a sample of gas in the determination of the various components. It is reported that 5A molecular sieve can separate H 2, O 2, N 2, CO, CH 4 from gas when using helium as carrier gas; porapak can separate CO 2, C 2 H 4, C 2 H 6 and other components. The structure of this gas chromatograph is complex, not only to install a reversing valve, but also to be automatically controlled. Domestic, generally using two-gas GC and two injection method for the analysis of various components of the gas, the method requires not only the two-gas GC, and two injections will give the analysis of data to bring greater error.