# 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 57: In order to reduce SOX, HCl and HF emissions to air from the combustion of process fuels from the chemical industry 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.
Fuel choice
See descriptions in Section 8.4
Applicable within the constraints associated with the availability of different types of fuel and/or an alternative use of the process fuel
b.
Boiler sorbent injection (in-furnace or in-bed)
Applicable to existing combustion plants within the constraints associated with duct configuration, space availability and chemical installation safety.
Wet FGD and seawater FGD are not applicable to combustion plants operated < 500 h/yr.
There may be technical and economic restrictions for applying wet FGD or seawater FGD to combustion plants of < 300 MWth, and for retrofitting combustion plants operated between 500 h/yr and 1 500 h/yr with wet FGD or seawater FGD
c.
Duct sorbent injection (DSI)
d.
Spray dry absorber (SDA)
e.
Wet scrubbing
See description in Section 8.4.
Wet scrubbing is used to remove HCl and HF when no wet FGD is used to reduce SOX emissions
f.
Wet flue-gas desulphurisation (wet FGD)
See descriptions in Section 8.4
g.
Seawater FGD
Table 35
BAT-associated emission levels (BAT-AELs) for SO2 emissions to air from the combustion of 100 % process fuels from the chemical industry in boilers
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.
Type of combustion plant
BAT-AELs (mg/Nm3)
Yearly average
Daily average or average over the sampling period
New and existing boilers
10–110
90–200
Table 36
BAT-associated emission levels (BAT-AELs) for HCl and HF emissions to air from the combustion of process fuels from the chemical industry in boilers
For plants operated < 500 h/yr, these levels are indicative.
In the case of plants operated < 1 500 h/yr, the higher end of the BAT-AEL range is 20 mg/Nm3.
In the case of plants operated < 1 500 h/yr, the higher end of the BAT-AEL range is 7 mg/Nm3.
Combustion plant total rated thermal input(MWth)
BAT-AELs (mg/Nm3)
HCl
HF
Average of samples obtained during one year
New plant
Existing plant
New plant
Existing plant
< 100
1–7
2–15
< 1–3
< 1–6
≥ 100
1–5
1–9
< 1–2
< 1–3

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Source: https://www.legislation.gov.uk/eudn/2017/1442/annex/division/5/division/5.1/division/5.1.4/division/1 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-1442/annex/division-5/division-5.1/division-5.1.4/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.