# Commission Implementing Decision (EU) 2017/1442 of 31 July 2017 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for large combustion plants (notified under document C(2017) 5225) (Text with EEA relevance), Division BAT 49: In order to prevent or reduce CO emissions to air from the combustion of iron and steel process gases, BAT is to use one or a combination of the techniques given below.

Extent: E+W+S+N.I.

Technique
Description
Applicability
a.
Combustion optimisation
See descriptions in Section 8.3
Generally applicable
b.
Oxidation catalysts
Only applicable to CCGTs.
The applicability may be limited by lack of space, the load requirements and the sulphur content of the fuel
Table 29
BAT-associated emission levels (BAT-AELs) for NOX emissions to air from the combustion of 100 % iron and steel process gases
Plants combusting a mixture of gases with an equivalent LHV of > 20 MJ/Nm3 are expected to emit at the higher end of the BAT-AEL ranges.
The lower end of the BAT-AEL range can be achieved when using SCR.
For plants operated < 1 500 h/yr, these BAT AELs do not apply.
In the case of plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 160 mg/Nm3. Furthermore, the higher end of the BAT-AEL range may be exceeded when SCR cannot be used and when using a high share of COG (e.g. > 50 %) and/or when combusting COG with a relatively high level of H2. In this case, the higher end of the BAT-AEL range is 220 mg/Nm3.
For plants operated < 500 h/yr, these levels are indicative.
In the case of plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 70 mg/Nm3.
Type of combustion plant
O2 reference level (vol-%)
BAT-AELs (mg/Nm3)
Yearly average
Daily average or average over the sampling period
New boiler
3
15–65
22–100
Existing boiler
3
20–100
22–110
New CCGT
15
20–35
30–50
Existing CCGT
15
20–50
30–55
As an indication, the yearly average CO emission levels will generally be:
< 5–100 mg/Nm3 for existing boilers operated ≥ 1 500 h/yr,
< 5–35 mg/Nm3 for new boilers,
< 5–20 mg/Nm3 for existing CCGTs operated ≥ 1 500 h/yr or new CCGTs.

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Source: https://www.legislation.gov.uk/eudn/2017/1442/annex/division/4/division/4.2/division/4.2.2/division/3 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-1442/annex/division-4/division-4.2/division-4.2.2/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.