Method for separating air by cryogenic distillation in turbine of turbo compressor of e.g. car, involves heating oxygen-enriched stream, and sending oxygen-enriched stream to heat exchanger for cooling air upstream purification

摘要

The method involves cooling air in a heat exchanger (15), and purifying the air cooled by adsorption to remove water and carbon dioxide in a water purification unit (23). The cooled and purified air from the purification unit is sent to an air separation plant (26) to be cooled and separated by cryogenic distillation into a nitrogen enriched flow (41) and oxygen enriched flows (27, 37). The nitrogen enriched flow and the oxygen-enriched stream are subjected to heat. The oxygen-enriched stream is sent to the heat exchanger for cooling the air upstream purification. An independent claim is also included for an apparatus for separating air by cryogenic distillation.