APPARATUS FOR CONCENTRATING METHANE GAS

摘要

A methane gas concentrating apparatus including: an absorption unit which supplies biogas containing methane gas and carbon dioxide to the interior of porous hollow fiber, and which dissolves the carbon dioxide from the hollow fiber into liquid absorbent; a stripping deaeration unit into which flows liquid absorbent that issues from the absorption unit, which feeds gas other than carbon dioxide and methane gas into porous hollow fiber, and which recovers carbon dioxide by passing the carbon dioxide in the liquid absorbent in which the carbon dioxide was dissolved by the absorption unit through the hollow fiber; and a vacuum deaeration unit into which flows liquid absorbent that issues from the stripping deaeration unit, and which recovers the carbon dioxide in the liquid absorbent and the gas that was intermixed with the liquid absorbent by the stripping deaeration unit by passing the carbon dioxide and the gas through hollow fiber by reducing pressure inside the porous hollow fiber.