Optimizing vapor separation from renewable tail gas:An example from Xiangguosi UGS
Some renewable tail gas with rich water may enlarge burner's operating load during natural-gas dehydration and tail gas treatment,and even lead to frequent troubles in this burner.Therefore,a two-stage method which the shell-tube heat exchanger is conducted as the heat recovery device and the finned heat exchanger as the forced cooling device has been proposed to separate cooling vapor.Its separation mechanisms were analyzed for the vapor in the renewable tail gas,and the separation effect of two-stage cooling was discussed through simulation calculation as well.In addition,the system of tail gas treatment was optimized for Xiangguosi underground gas storage(UGS)based on calculation results,and its operation were compared with simulation.Results show that(i)cooling the renewable tail gas under constant pressure can improve the condensation separation rate;(ⅱ)the proposed method makes as little gas enter into an incinerator as pos-sible to reduce the troubles through lightening the load;and(ⅲ)with heat recovery,the optimized treatment system reduc-es not only energy consumption in the incinerator but carbon emission.In conclusion,this two-stage vapor separation meth-od can realize the renewable tail gas in deep dehydration to further de-load in the burner and eliminate frequent troubles.
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