Division II Secondary or end-of-pipe techniques, such as:
United Kingdom
| Technique | Description | Applicability |
|---|---|---|
| (i) Selective catalytic reduction (SCR) | See Section 1.20.2 | Generally applicable for new units. For existing units, the applicability may be constrained due to the requirements for significant space and optimal reactant injection |
| (ii) Selective non-catalytic reduction (SNCR) | See Section 1.20.2 | Generally applicable for new units. For existing units, the applicability may be constrained by the requirement for the temperature window and the residence time to be reached by reactant injection |
| (iii) Low temperature oxidation | See Section 1.20.2 | The applicability may be limited by the need for additional scrubbing capacity and by the fact that ozone generation and the associated risk management need to be properly addressed. The applicability may be limited by the need for additional waste water treatment and related cross-media effects (e.g. nitrate emissions) and by an insufficient supply of liquid oxygen (for ozone generation). For existing units, the applicability of the technique may be limited by space availability |
| (iv) SNOX combined technique | See Section 1.20.4 | Applicable only for high flue-gas (e.g. > 800 000 Nm3/h) flow and when combined NOX and SOX abatement is needed |
Notes on Division
Footnotes
- f1
-
BAT-AEL refers to combined emissions from the gas turbine and the supplementary firing recovery boiler, where present.
- f2
-
For fuel with high H2 content (i.e. above 10 %), the upper end of the range is 75 mg/Nm3.
- f3
-
For an existing unit using high air pre-heat (i.e. > 200 °C) or with H2 content in the fuel gas higher than 50 %, the upper end of the BAT-AEL range is 200 mg/Nm3.
- f4
-
For existing units < 100 MW firing fuel oil with a nitrogen content higher than 0,5 % (w/w) or with liquid firing > 50 % or using air preheating, values up to 450 mg/Nm3 may occur.
- f5
-
The lower end of the range can be achieved by using the SCR technique.