Division BAT 74 In order to reduce SOX emissions to air from IGCC plants, BAT is to use the technique given below.
United Kingdom
| Technique | Description | Applicability | |
|---|---|---|---|
| a. | Acid gas removal | Sulphur compounds from the feedstock of a gasification process are removed from the syngas via acid gas removal, e.g. including a COS (and HCN) hydrolysis reactor and the absorption of H2S using a solvent such as methyl diethanolamine. Sulphur is then recovered as either liquid or solid elemental sulphur (e.g. through a Claus unit), or as sulphuric acid, depending on market demands | The applicability may be limited in the case of biomass IGCC plants due to the very low sulphur content in biomass |
The BAT-associated emission level (BAT-AEL) for SO2 emissions to air from IGCC plants of ≥ 100 MWth is 3–16 mg/Nm3, expressed as a yearly average.