Division 34

United Kingdom

BAT is to reduce SO_X emissions from the melting furnace by using one or a combination of the following techniques:

Technique^f1	Applicability
A description of the techniques is given in Sections 1.10.3 and 1.10.6.
(i) Minimisation of the sulphur content in the batch formulation and optimisation of the sulphur balance	The technique is generally applicable within the constraints of quality requirements of the final glass product. The application of sulphur balance optimisation requires a trade-off approach between the removal of SO_X emissions and the management of the solid waste (filter dust), which needs to be disposed of
(ii) Use of low sulphur content fuels	The applicability may be limited by the constraints associated with the availability of low sulphur fuels, which may be impacted by the energy policy of the Member State
(iii) Dry or semi-dry scrubbing, in combination with a filtration system	The technique is generally applicable. The presence of high concentrations of boron compounds in the flue-gases may limit the abatement efficiency of the reagent used in the dry or semi-dry scrubbing systems
(iv) Use of wet scrubbing	The technique is generally applicable within technical constraints; i.e. need for a specific waste water treatment plant

Table 24

BAT-AELs for SO_X emissions from the melting furnace in the continuous filament glass fibre sector

Parameter	Fuel	BAT-AEL^f2
The higher levels of the range are associated with the use of sulphates in the batch formulation for refining the glass.
The conversion factor reported in Table 2 (4,5 × 10^–3) has been applied.
For oxy-fuel furnaces with the application of wet scrubbing, the BAT-AEL is reported to be < 0,1 kg/tonne melted glass of SO_X, expressed as SO₂.
The associated emission levels are related to the use of 1 % sulphur fuel oil in combination with secondary abatement techniques.
The lower levels correspond to conditions where the reduction of SO_X is a priority over a lower production of solid waste corresponding to the sulphate-rich filter dust. In this case, the lower levels are associated with the use of a bag filter.
Parameter	Fuel	mg/Nm³	kg/tonne melted glass^f3
SO_x expressed as SO₂	Natural gas^f4	< 200 – 800	< 0,9 – 3,6
SO_x expressed as SO₂	Fuel oil^f5 ^f6	< 500 – 1 000	< 2,25 – 4,5

Annotations

f1: A description of the techniques is given in Sections 1.10.3 and 1.10.6.
f2: The higher levels of the range are associated with the use of sulphates in the batch formulation for refining the glass.
f3: The conversion factor reported in Table 2 (4,5 × 10^–3) has been applied.
f4: For oxy-fuel furnaces with the application of wet scrubbing, the BAT-AEL is reported to be < 0,1 kg/tonne melted glass of SO_X, expressed as SO₂.
f5: The associated emission levels are related to the use of 1 % sulphur fuel oil in combination with secondary abatement techniques.
f6: The lower levels correspond to conditions where the reduction of SO_X is a priority over a lower production of solid waste corresponding to the sulphate-rich filter dust. In this case, the lower levels are associated with the use of a bag filter.