Division BAT 75 In order to prevent or reduce dust, particulate-bound metal, ammonia and halogen emissions to air from IGCC plants, BAT is to use one or a combination of the techniques given below.
United Kingdom
| Technique | Description | Applicability | |
|---|---|---|---|
| a. | Syngas filtration | Dedusting using fly ash cyclones, bag filters, ESPs and/or candle filters to remove fly ash and unconverted carbon. Bag filters and ESPs are used in the case of syngas temperatures up to 400 °C | Generally applicable |
| b. | Syngas tars and ashes recirculation to the gasifier | Tars and ashes with a high carbon content generated in the raw syngas are separated in cyclones and recirculated to the gasifier, in the case of a low syngas temperature at the gasifier outlet (< 1 100 °C) | |
| c. | Syngas washing | Syngas passes through a water scrubber, downstream of other dedusting technique(s), where chlorides, ammonia, particles and halides are separated | |
Table 44
BAT-associated emission levels (BAT-AELs) for dust and particulate-bound metal emissions to air from IGCC plants
| IGCC plant total rated thermal input(MWth) | BAT-AELs | ||
|---|---|---|---|
| Sb + As + Pb + Cr + Co + Cu + Mn + Ni + V (mg/Nm3)(Average over the sampling period) | Hg (μg/Nm3)(Average over the sampling period) | Dust (mg/Nm3)(yearly average) | |
| ≥ 100 | < 0,025 | < 1 | < 2,5 |