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

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

Technique
Description
Applicability
a.
Low-NOX combustion concept in diesel engines
See descriptions in Section 8.3
Generally applicable
b.
Exhaust-gas recirculation (EGR)
Not applicable to four-stroke engines
c.
Water/steam addition
Applicable within the constraints of water availability.
The applicability may be limited where no retrofit package is available
d.
Selective catalytic reduction (SCR)
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.
Retrofitting existing combustion plants may be constrained by the availability of sufficient space

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Source: https://www.legislation.gov.uk/eudn/2017/1442/annex/division/3/division/3.2/division/3.2.2/division/1 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-1442/annex/division-3/division-3.2/division-3.2.2/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.