# 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 50: In order to prevent or reduce SOX emissions to air from the combustion of iron and steel process gases, BAT is to use a combination of the techniques given below.

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

Technique
Description
Applicability
a.
Process gas management system and auxiliary fuel choice
See description in Section 8.2.
To the extent allowed by the iron- and steel-works, maximise the use of:
a majority of blast furnace gas with a low sulphur content in the fuel diet,
a combination of fuels with a low averaged sulphur content, e.g. individual process fuels with a very low S content such as:
Blast furnace gas with a sulphur content < 10 mg/Nm3,
coke oven gas with a sulphur content < 300 mg/Nm3,
and auxiliary fuels such as:
natural gas,
liquid fuels with a sulphur content of ≤ 0,4 % (in boilers).
Use of a limited amount of fuels with a higher sulphur content
Generally applicable within the constraints associated with the availability of different types of fuel
b.
Coke oven gas pretreatment at the iron- and steel-works
Use of one of the following techniques:
desulphurisation by absorption systems,
wet oxidative desulphurisation
Only applicable to coke oven gas combustion plants
Table 30
BAT-associated emission levels (BAT-AELs) for SO2 emissions to air from the combustion of 100 % iron and steel process gases
For existing plants operated < 1 500 h/yr, these BAT AELs do not apply.
For existing plants operated < 500 h/yr, these levels are indicative.
The higher end of the BAT-AEL range may be exceeded when using a high share of COG (e.g. > 50 %). In this case, the higher end of the BAT-AEL range is 300 mg/Nm3.
Type of combustion plant
O2 reference level (%)
BAT-AELs for SO2 (mg/Nm3)
Yearly average
Daily average or average over the sampling period
New or existing boiler
3
25–150
50–200
New or existing CCGT
15
10–45
20–70

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Source: https://www.legislation.gov.uk/eudn/2017/1442/annex/division/4/division/4.2/division/4.2.3/division/1 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-1442/annex/division-4/division-4.2/division-4.2.3/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.