Process and device for desulphurization and denitration of flue gas

摘要

Disclosed are a process and device for desulphurization and denitration of a flue gas. A desulphurization and denitration solution is used to absorb sulphur dioxide and/or oxynitrides in the flue gas or various combustion tail (waste) gases in an absorption tower. The desulphurization and denitration solution that has absorbed sulphur dioxide and/or oxynitrides releases the sulphur dioxide and/or oxynitrides by heating and/or gas stripping and/or vacuum regeneration in a regeneration tower. The released sulphur dioxide and/or oxynitrides are further concentrated into a higher-purity sulphur dioxide and/or oxynitride product in a concentration tower. The regenerated desulphurization and denitration solution is recycled. The process and device have a wide industrial use, and can be used for desulphurization and denitration of flue gases, incineration gases, coke-oven gases, synthetic waste gases from dye factories, waste drainage gases from chemical fibre factories, and other industrial raw material gases or waste gases containing SOx.