Air separating method for carbon oxycombustion frame, involves sending oxygen and nitrogen enrich liquids, and reheating nitrogen rich flow from low pressure columns and oxygen rich flow in exchange line

摘要

The method involves sending an oxygen rich liquid to a condenser head (59) from a tank of low pressure columns (19, 39) for forming oxygen rich gas. Nitrogen is sent to a vaporizer from a head of an average pressure column (9), and the condensed nitrogen is returned to the average pressure column. Oxygen and nitrogen enrich liquids (17, 18) are sent to the low pressure columns from the average pressure column. A nitrogen rich flow from the low pressure columns and oxygen rich flow are reheated in an exchange line (3). An independent claim is also included for an apparatus for separating air by cryogenic distillation.