# 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 28: In order to prevent or reduce NOX emissions to air while limiting CO emissions to air from the combustion of HFO and/or gas oil in boilers, BAT is to use one or a combination of the techniques given below.

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

Technique
Description
Applicability
a.
Air staging
See descriptions in Section 8.3
Generally applicable
b.
Fuel staging
c.
Flue-gas recirculation
d.
Low-NOX burners (LNB)
e.
Water/steam addition
Applicable within the constraints of water availability
f.
Selective non-catalytic reduction (SNCR)
Not applicable to combustion plants operated < 500 h/yr with highly variable boiler loads.
The applicability may be limited in the case of combustion plants operated between 500 h/yr and 1 500 h/yr with highly variable boiler loads
g.
Selective catalytic reduction (SCR)
See descriptions in Section 8.3
Not applicable to combustion plants operated < 500 h/yr.
There may be technical and economic restrictions for retrofitting existing combustion plants operated between 500 h/yr and 1 500 h/yr.
Not generally applicable to combustion plants of < 100 MWth
h.
Advanced control system
Generally applicable to new combustion plants. The applicability to old combustion plants may be constrained by the need to retrofit the combustion system and/or control command system
i.
Fuel choice
Applicable within the constraints associated with the availability of different types of fuel, which may be impacted by the energy policy of the Member State
Table 14
BAT-associated emission levels (BAT-AELs) for NOX emissions to air from the combustion of HFO and/or gas oil in boilers
These BAT-AELs do not apply to plants operated < 1 500 h/yr.
For plants operated < 500 h/yr, these levels are indicative.
For industrial boilers and district heating plants put into operation no later than 27 November 2003, which are operated < 1 500 h/yr and for which SCR and/or SNCR is not applicable, the higher end of the BAT-AEL range is 450 mg/Nm3.
The higher end of the BAT-AEL range is 110 mg/Nm3 for plants of 100–300 MWth and plants of ≥ 300 MWth that were put into operation no later than 7 January 2014.
The higher end of the BAT-AEL range is 145 mg/Nm3 for plants of 100–300 MWth and plants of ≥ 300 MWth that were put into operation no later than 7 January 2014.
For industrial boilers and district heating plants of > 100 MWth put into operation no later than 27 November 2003, which are operated < 1 500 h/yr and for which SCR and/or SNCR is not applicable, the higher end of the BAT-AEL range is 365 mg/Nm3.
Combustion plant total rated thermal input(MWth)
BAT-AELs (mg/Nm3)
Yearly average
Daily average or average over the sampling period
New plant
Existing plant
New plant
Existing plant
< 100
75–200
150–270
100–215
210–330
≥ 100
45–75
45–100
85–100
85–110
As an indication, the yearly average CO emission levels will generally be:
10-30 mg/Nm3 for existing combustion plants of < 100 MWth operated ≥ 1 500 h/yr, or new combustion plants of <100 MWth,
10–20mg/Nm3 for existing combustion plants of ≥ 100 MWth operated ≥ 1 500 h/yr, or new combustion plants of ≥ 100 MWth.

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Source: https://www.legislation.gov.uk/eudn/2017/1442/annex/division/3/division/3.1/division/3.1.2/division/1 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-1442/annex/division-3/division-3.1/division-3.1.2/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.