Removal of Trace Impurities from Hydrogen Recycle Gas

摘要

The available data and information in the SRC-II demonstration plant design documents concerning contaminants in the hydrogen recycle gas which could be detrimental to operation of the cryogenic separation unit have been evaluated. The analytic information for H sub 2 S, CO sub 2 , and hydrocarbons is rather consistent, but the data for trace contaminants, particularly nitrogen oxides, is very uncertain. The maximum tolerable concentrations of trace contaminants in the cryogenic unit are also not well defined. The current demonstration plant design appears to provide for adequate removal of all trace compounds except nitric oxide. Facilities should be provided for further removal of nitric oxide. Further experimental and/or engineering work to resolve the present uncertainties would be useful, but would be unnecessary if the costly pretreatment requirements result in replacement of the cryogenic unit by another type of separation in future designs. (ERA citation 08:038354)