Technical paper
Addition of Static Mixers Increases Treating Capacity in Central Texas Gas Plant
Due to the addition of new wells, the feed to Ferguson Burleson County Gas Gathering System (FB) Anderson gas treating plant was scheduled to increase from 180 MMSCFD to a design capacity of 210 MMSCFD. The feed gas contained both CO2 (6.0 mol %) and H2S (25 ppm) at high pressure (980 psig). A feasibility study determined that a cost effective method to handle the additional gas volume was to switch from a single amine to an amine mixture and to add static mixers to treat a bypass stream for H2S. The primary amine contactors would perform bulk removal of the acid gases from the main stream. Although increased treating capacity was the ultimate goal, a secondary concern was that corrosion be kept to within acceptable limits. To be certain this concern was adequately addressed, all of the heat exchangers within the system were rated and heat fluxes were investigated for possible problem areas. Several different amine mixtures were also evaluated with an eye toward potential corrosion limitations. This paper discusses the modifications made to the system and the results of subsequent plant trials to determine the overall capacity increase.
Due to the addition of new wells, the feed to Ferguson Burleson County Gas Gathering System (FB) Anderson gas treating plant was scheduled to increase from 180 MMSCFD to a design capacity of 210 MMSCFD. The feed gas contained both CO2 (6.0 mol %) and H2S (25 ppm) at high pressure (980 psig). A feasibility study determined that a cost effective method to handle the additional gas volume was to switch from a single amine to an amine mixture and to add static mixers to treat a bypass stream for H2S. The primary amine contactors would perform bulk removal of the acid gases from the main stream. Although increased treating capacity was the ultimate goal, a secondary concern was that corrosion be kept to within acceptable limits. To be certain this concern was adequately addressed, all of the heat exchangers within the system were rated and heat fluxes were investigated for possible problem areas. Several different amine mixtures were also evaluated with an eye toward potential corrosion limitations. This paper discusses the modifications made to the system and the results of subsequent plant trials to determine the overall capacity increase.