The present invention relates to an automatic control method for purifying biogas in targeted even methane concentration by real-time measurement of methane concentration using two flow rate control units. The present invention relates to an automatic control method for purifying biogas at targeted even methane concentration by measuring methane concentration in real time using the two flow rate control units to supply fixed concentrations of methane when ion gas is upgraded and used for gas-to-liquid (GTL) reaction or hydrogen reforming, and specifically, to a gas purification method by different speeds of gas ingredients of a membrane. The automatic control method for purifying biogas can obtain purified gas of the methane in a preset concentration by increasing the predetermined flow rate and measuring the concentration of the purified gas. Two flow rate control devices are installed, and the preset targeted methane concentration can be reached in a moment when the measured methane concentration exceeds the targeted methane concentration over a predetermined level. The automatic control method also enables a method for reducing purity except for a method for increasing the purity of the methane. So, the automatic control method can automatically and fixedly purify the biogas to the preset target concentration.
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