# 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 24: In order to prevent or reduce NOX emissions to air while limiting CO and N2O emissions to air from the combustion of solid biomass and/or peat, 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.
Low-NOX burners (LNB)
c.
Air staging
d.
Fuel staging
e.
Flue-gas recirculation
f.
Selective non-catalytic reduction (SNCR)
See description in Section 8.3.
Can be applied with ‘slip’ SCR
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.
For existing combustion plants, applicable within the constraints associated with the required temperature window and residence time for the injected reactants
g.
Selective catalytic reduction (SCR)
See description in Section 8.3.
The use of high-alkali fuels (e.g. straw) may require the SCR to be installed downstream of the dust abatement system
Not applicable to combustion plants operated < 500 h/yr.
There may be economic restrictions for retrofitting existing combustion plants of < 300 MWth.
Not generally applicable to existing combustion plants of < 100 MWth
Table 9
BAT-associated emission levels (BAT-AELs) for NOX emissions to air from the combustion of solid biomass and/or peat
These BAT-AELs do not apply to plants operated < 1 500 h/yr.
For combustion plants operated < 500 h/yr, these levels are indicative.
For plants burning fuels where the average potassium content is 2 000 mg/kg (dry) or higher, and/or the average sodium content is 300 mg/kg or higher, the higher end of the BAT-AEL range is 200 mg/Nm3.
For plants burning fuels where the average potassium content is 2 000 mg/kg (dry) or higher, and/or the average sodium content is 300 mg/kg or higher, the higher end of the BAT-AEL range is 250 mg/Nm3.
For plants burning fuels where the average potassium content is 2 000 mg/kg (dry) or higher, and/or the average sodium content is 300 mg/kg or higher, the higher end of the BAT-AEL range is 260 mg/Nm3.
For plants put into operation no later than 7 January 2014 and burning fuels where the average potassium content is 2 000 mg/kg (dry) or higher, and/or the average sodium content is 300 mg/kg or higher, the higher end of the BAT-AEL range is 310 mg/Nm3.
The higher end of the BAT-AEL range is 160 mg/Nm3 for plants put into operation no later than 7 January 2014.
The higher end of the BAT-AEL range is 200 mg/Nm3 for plants put into operation no later than 7 January 2014.
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
50–100
70–150
70–225
120–200
120–275
100–300
50–140
50–180
100–200
100–220
≥ 300
40–140
40–150
65–150
95–165
As an indication, the yearly average CO emission levels will generally be:
< 30–250 mg/Nm3 for existing combustion plants of 50–100 MWth operated ≥ 1 500 h/yr, or new combustion plants of 50–100 MWth,
< 30–160 mg/Nm3 for existing combustion plants of 100–300 MWth operated ≥ 1 500 h/yr, or new combustion plants of 100–300 MWth,
< 30–80 mg/Nm3 for existing combustion plants of ≥ 300 MWth operated ≥ 1 500 h/yr, or new combustion plants of ≥ 300 MWth.

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Source: https://www.legislation.gov.uk/eudn/2017/1442/annex/division/2/division/2.2/division/2.2.2/division/1 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-1442/annex/division-2/division-2.2/division-2.2.2/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.