A method for drying a wet CO2 rich gas stream from an oxy-combustion process

Abstract

A method for drying a wet CO2 rich gas stream from an oxy-combustion process comprises: compressing the wet CO2 rich gas stream (1) to a drying process operating pressure, cooling the wet CO2 rich gas stream (1) in at least one cooler (3.1, 3.2), alternately drying the wet CO2 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 CO2 rich gas stream (1), separating the dried CO2 rich gas stream (1) in a purification process to a purified CO2 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 CO2 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 CO2 rich gas stream conducted from the compressor (2) before each drying process.

Description

technical field [0001] The present invention relates to a method for drying wet CO-enriched gas from an oxy-combustion process 2 A method of gas flow, in particular a drying method with an adsorption process using a desiccant (adsorbent) and regenerating the adsorbent. Background technique [0002] Wet CO-enriched from the oxyfuel combustion process 2 The gas stream must be treated to remove H during or after the first compression step 2 O. This wet, CO-rich 2 Moisture in the gas stream. For such a drying step or process, typically at least one vessel containing at least one desiccant is used to absorb the wet CO-enriched gas passing through the desiccant in one direction. 2 Moisture in the gas stream. For desiccant regeneration, an air flow through the desiccant bed is provided in the opposite direction. A typical installation foresees two dryers, one for operation while the other is on standby, correspondingly in regeneration mode. [0003] Patent WO2009 / 071816A2 d...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that this known method is disadvantageous in that the dry CO-enriched 2 The gas is used as regeneration gas and after regeneration the gas is vented to the atmosphere

This causes CO 2 loss of this defect

On the other hand, CO 2 The cycle leads to the defect of increasing the energy required for compression

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