OPTIONS IN GAS CHROMATOGRAPHIC TECHNIQUES FOR MEASUREMENT OF H2S IN FUEL GAS

摘要

To reduce the negative environmental effects of acid rain, federal environmental regulationsrnrequire limits on the emission of SO_2 from combustion processes. In many hydrocarbonrnprocessing plants, the choices for measuring and controlling SO_2 include the indirect method ofrnmeasuring H_2S in the fuel gas used for furnaces and other process combustion units. The federalrnregulations specify a limit on the quantity of H_2S that is permitted in such fuel gases and onerncommon method for measuring the H_2S concentration in fuel gas is with process gasrnchromatography. But two markedly different chromatographic methods also exist which involvernusing thermal conductivity detection in one case and flame photometric detection in the other.rnThis paper looks at the two techniques and provides comparisons of their relative advantages andrndisadvantages. Additionally, the potential of the two techniques for modification is consideredrnin light of current discussions about possible further changes in the federal regulations.