In order to solve the problems that amine decarbonization method has a poor effect and the plant consumes high energy because of high temperature(≥60℃),high flow rate(1 200×l04 m3 per day)and low partial pressure of carbon dioxide(≤0.5 MPa)of the raw gas in the desert gas field,a"split absorption-interstage recirculation cooling"coupling process is proposed.Aspen HYSYS software is employed to establish model and optimize the process,and the optimal parameters are obtained as follows:the optimal split ratio is 25％,and the optimal reflux position of the cooling strand is at the 12th stage plate.On this basis,taking the conventional one-stage absorption+(flash+stripping)regeneration process as a reference under the same working conditions,the improved process loses less methane and less light hydrocarbon,gains higher purified gas flow rate and save more energy.
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