Tail Gas Capture Efficiency Using Gas Chromatographic Analysis

In this paper, activated carbon was selected as the adsorption material to study the adsorption and desorption performance of krypton(Kr) and xenon(Xe) gases at various temperatures. A chromatographic quantitative loop tail gas collection column was prepared to achieve the capture of krypton and xenon in the tail gas of the chromatographic quantitative loop, by using activated carbon. The chromatographic quantitative ring tail gas collection column can operate at liquid nitrogen temperature and is used to capture the krypton and xenon gases in the tail gas of the chromatographic quantitative ring, and the lifespan of the gas collection column is no less than 500 injections. Two chromatographic quantitative loop tail gas emission modes, named venting mode and trapped mode were proposed. The emission mode that tail gas directly discharged into the atmosphere is called venting mode, and the emission mode that tail gas passed through the collection column and discharged into the atmosphere is called trapped mode. These two emission modes were selected to study the influence of the tail gas collection column on the performance of the gas chromatograph by comparing the gas flow rate, the retention time, half peak width, peak area response, and simulated samples measurement of noble gas components. There is no significant effect on the carrier gas flow rate under both modes. The absolute value of relative deviation of retention time in these two modes is no more than 0.3%, the absolute value of relative deviation of peak area response in these two modes is no more than 1.0%, and the relative standard deviation(s_r) value of retention time and peak area response in these two modes is no more than 0.7%(n=7). Meanwhile, two types of standard curves of various noble gases in venting mode and trapped mode, two different emission modes are prepared, and all the linear correlation coefficients of standard curves of various noble gases are more than 0.999. Under the two tail gas emission modes, two types of standard curves in different emission modes were selected to measure three groups of identical samples. It shows that the absolute values of the measurement relative deviation of the same sample under the two tail gas emission modes are no more than 1.1%. The installation of the tail gas collection column has no significant impact on the quantitative analysis of the chromatograph. One set of standard curves of various noble gases can also be used under both tail gas emission modes, and there is no significant difference in the quantitative analysis results.