# 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 41: In order to prevent or reduce NOX emissions to air from the combustion of natural gas 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 and/or fuel staging
See descriptions in Section 8.3.
Air staging is often associated with low-NOX burners
Generally applicable
b.
Flue-gas recirculation
See description in Section 8.3
c.
Low-NOX burners (LNB)
d.
Advanced control system
See description in Section 8.3.
This technique is often used in combination with other techniques or may be used alone for combustion plants operated < 500 h/yr
The applicability to old combustion plants may be constrained by the need to retrofit the combustion system and/or control command system
e.
Reduction of the combustion air temperature
See description in Section 8.3
Generally applicable within the constraints associated with the process needs
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)
Not applicable to combustion plants operated < 500 h/yr.
Not generally applicable to combustion plants of < 100 MWth.
There may be technical and economic restrictions for retrofitting existing combustion plants operated between 500 h/yr and 1 500 h/yr

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Source: https://www.legislation.gov.uk/eudn/2017/1442/annex/division/4/division/4.1/division/4.1.2/division/1 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-1442/annex/division-4/division-4.1/division-4.1.2/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.