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Division BAT 51 In order to reduce dust emissions to air from the combustion of iron and steel process gases, BAT is to use one or a combination of the techniques given below.

United Kingdom

Technique		Description	Applicability
a.	Fuel choice/management	Use of a combination of process gases and auxiliary fuels with a low averaged dust or ash content	Generally applicable within the constraints associated with the availability of different types of fuel
b.	Blast furnace gas pretreatment at the iron- and steel-works	Use of one or a combination of dry dedusting devices (e.g. deflectors, dust catchers, cyclones, electrostatic precipitators) and/or subsequent dust abatement (venturi scrubbers, hurdle-type scrubbers, annular gap scrubbers, wet electrostatic precipitators, disintegrators)	Only applicable if blast furnace gas is combusted
c.	Basic oxygen furnace gas pretreatment at the iron- and steel-works	Use of dry (e.g. ESP or bag filter) or wet (e.g. wet ESP or scrubber) dedusting. Further descriptions are given in the Iron and Steel BREF	Only applicable if basic oxygen furnace gas is combusted
d.	Electrostatic precipitator (ESP)	See descriptions in Section 8.5	Only applicable to combustion plants combusting a significant proportion of auxiliary fuels with a high ash content
e.	Bag filter	See descriptions in Section 8.5

Table 31

BAT-associated emission levels (BAT-AELs) for dust emissions to air from the combustion of 100 % iron and steel process gases

Type of combustion plant	BAT-AELs for dust (mg/Nm³)
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	Yearly average^f1	Daily average or average over the sampling period^f2
New or existing boiler	2–7	2–10
New or existing CCGT	2–5	2–5

Annotations

Footnotes

f1: For existing plants operated < 1 500 h/yr, these BAT-AELs do not apply.
f2: For existing plants operated < 500 h/yr, these levels are indicative