Division BAT 33 In order to prevent or reduce emissions of CO and volatile organic compounds to air from the combustion of HFO and/or gas oil in reciprocating engines, BAT is to use one or both of the techniques given below.

United Kingdom

Technique	Description	Applicability
a.	Combustion optimisation		Generally applicable
b.	Oxidation catalysts	See descriptions in Section 8.3	Not applicable to combustion plants operated < 500 h/yr. The applicability may be limited by the sulphur content of the fuel

Technique

Description

Applicability

Combustion optimisation

Generally applicable

Oxidation catalysts

See descriptions in Section 8.3

Not applicable to combustion plants operated < 500 h/yr.

The applicability may be limited by the sulphur content of the fuel

Table 18

BAT-associated emission levels (BAT-AELs) for NO_X emissions to air from the combustion of HFO and/or gas oil in reciprocating engines

Combustion plant total rated thermal input(MW_th)	BAT-AELs (mg/Nm³)
These BAT-AELs do not apply to plants operated < 1 500 h/yr or to plants that cannot be fitted with secondary abatement techniques.
The BAT-AEL range is 1 150–1 900 mg/Nm³ for plants operated < 1 500 h/yr and for plants that cannot be fitted with secondary abatement techniques.
For plants operated < 500 h/yr, these levels are indicative.
For plants including units of < 20 MW_th combusting HFO, the higher end of the BAT-AEL range applying to those units is 225 mg/Nm³.
	Yearly average		Daily average or average over the sampling period
	New plant	Existing plant^f1	New plant	Existing plant^f2 ^f3
≥ 50	115–190^f4	125–625	145–300	150–750

As an indication, for existing combustion plants burning only HFO and operated ≥ 1 500 h/yr or new combustion plants burning only HFO,

the yearly average CO emission levels will generally be 50–175 mg/Nm³,
the average over the sampling period for TVOC emission levels will generally be 10–40 mg/Nm³.

Annotations

f1: These BAT-AELs do not apply to plants operated < 1 500 h/yr or to plants that cannot be fitted with secondary abatement techniques.
f2: The BAT-AEL range is 1 150–1 900 mg/Nm³ for plants operated < 1 500 h/yr and for plants that cannot be fitted with secondary abatement techniques.
f3: For plants operated < 500 h/yr, these levels are indicative.
f4: For plants including units of < 20 MW_th combusting HFO, the higher end of the BAT-AEL range applying to those units is 225 mg/Nm³.