A METHOD FOR DRYING A WET CO2 RICH GAS STREAM FROM AN OXY-COMBUSTION PROCESS

摘要

A method for drying a wet C02 rich gas stream from an oxy-combustion process comprises: compressing the wet C02 rich gas stream (1) to a drying process operating pressure, cooling the wet C02 rich gas stream (1) in at least one cooler (3.1, 3.2), alternately drying the wet C02 rich gas stream (1) in at least one dryer (6.1, 6.2) which contains at least one desiccant bed (7.1, 7.2) and regenerating the desiccant bed (7.1, 7.2) by conducting a heated regenerating gas (9) through the dryer (6.1, 6.2) in opposite direction to the flow direction of the wet C02 rich gas stream (1), separating the dried C02 rich gas stream (1) in a purification process to a purified C02 gas stream and a waste gas stream rich in nitrogen and oxygen, whereby the waste gas stream rich in nitrogen and oxygen is used as regenerating gas (9), and subsequently to the regeneration the dryer (6.1, 6.2) is purged at least once by a pressurized C02 rich gas stream conducted from the compressor (2), and whereby the dryer (6.1, 6.2) is charged up to the drying process operating pressure with a pressurized C02 rich gas stream conducted from the compressor (2) before each drying process.