BIOGAS PURIFICATION AND LIQUEFACTION BY MEANS OF A CRYOGENIC UPGRADING PROCESS

摘要

Transport sector represents one of the main responsible for greenhouse gas (GHG) emissions and natural gasrn(NG) could efficiently reduce them, especially in its liquid form (LNG) suitable for heavy-duty vehicles.rnNevertheless, in certain regions, LNG is difficult to supply and biogas is actually used as feedstock gas.rnHowever, due to its high CO_2 content, biogas needs to be purified. At present, several upgradingrntechnologies are existing but since the final scope is the LNG production, cryogenic upgrading technologyrnlooks very promising. However, this technology is still in a developing phase. This study proposes arncryogenic upgrading process in which CO_2 is removed and biomethane is liquefied (LBG) at the same time.rnMoreover, specific energy consumption is optimized by means of HYSYS simulation and a roughrneconomical analysis is also performed to evaluate its attractiveness. As a result, cryogenic upgradingrntechnology represents an interesting option for LBG production.