PROCESS FOR THE CRYOGENIC SEPARATION OF A SUPPLY RATE CONTAINING METHANE AND AIR GASES, INSTALLATION FOR THE PRODUCTION OF BIO METHANE BY PURIFYING BIOGAS FROM NON-HAZARDOUS WASTE STORAGE FACILITIES (ISDND) IMPLEMENTING THE PROCESS

摘要

A process for the cryogenic separation of a feed rate containing methane and air gases in which: - the feed rate is cooled to produce a cooled flow rate; - at least a portion of the cooled flow rate is sent to a at the level of a distillation column, a vat flow is withdrawn from the distillation column, the vat flow is enriched in methane with respect to the feed rate, and a flow enriched with oxygen is withdrawn from the distillation column. and in nitrogen with respect to the feed rate, at least one non-combustible and more volatile dilution flow rate than oxygen is introduced into the distillation column at at least a level lower than that at which the cooled flow rate is introduced, characterized in that the dilution rate is extracted from the feed rate. Plant for the production of bio methane by purification of biogas from non-hazardous waste storage facilities (ISDND) implementing the process