SYSTEM AND METHOD FOR STABILIZING METHANE CONCENTRATION IN BIOGAS

摘要

PROBLEM TO BE SOLVED: To stabilize methane concentration in the biogas to be discharged from a biogas generation apparatus.

SOLUTION: The system for stabilizing the methane concentration in biogas is provided with: a controller for opening a valve when the methane gas concentration in the biogas flowing-in from a methane gas generation apparatus is within a predetermined range; a biogas pump to be operated by the controller when the valve is opened; a cooling means for cooling the biogas sent from the biogas pump in a pressure range of normal pressure to 1.0 MPa by the cooling action of a Stirling cycle to solidify/remove carbon dioxide contained in the biogas and remove impurities such as liquefied siloxane and saturated steam as condensed water; a siloxane/condensed water discharging means for separating/discharging impurities such as siloxane and condensed water removed by the cooling means; a discharge means for discharging the adjusted biogas having the methane concentration adjusted by the cooling means; and a solid carbon dioxide storing/delivering means for storing the removed and solidified carbon dioxide and delivering the stored carbon dioxide to a predetermined instrument as a cooling medium.

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