Disclosed is a method for purification and
recovery of
methane with purity of 80-90 %, yield of 80-95% from refuse
landfill gas, comprising compression, desulfurization, refrigerating liquid separation, temperature swing adsorption (TSA) and
pressure swing adsorption (PSA). The desulfurization procedure adopts special type
active carbon and
iron oxide compounding desulfurizer, the total
sulfur after desulfurization is less than or equal to 20mg / m3; the refrigerating liquid
separation system temperature is 4-10íµ, most of water and high
boiling point substances are removed; the adsorbent in TSA adopts
alumina and
silica gel or
alumina and
active carbon in a volume ratio of 1:2-10, wherein the
alumina is filled in the entry end of the adsorbent
bed, the
silica gel or
active carbon is filled in the exit end of the adsorbent
bed, the adsorbent in TSA will also adopt alumina,
silica gel and active carbon in a volume ratio of 1:2-10:2-10. Evacuation
desorption technology is used in PSA, the adsorbent uses alumina and silica gel with a volume ratio of 1:3-10, an adsorbent pressure of 0.2-2.5 MPa(G), an evacuation pressure of -0.05- -0.09 MPa(G). The product
methane is obtained in the adsorption step, and the method is suitable for purification and
recovery of
methane with higher purity from refuse
landfill gas.