Division 52

United Kingdom

BAT is to reduce HCl and HF 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 Section 1.10.4.
(i) Selection of raw materials for the batch formulation with a low content of chlorine and fluorine	The applicability may be limited by the constraints of the batch formulation for the type of glass produced at the installation and the availability of raw materials
(ii) Minimisation of the fluorine and/or chlorine compounds in the batch formulation and optimisation of the fluorine and/or chlorine mass balance Fluorine compounds are used to confer particular characteristics to special glasses (i.e. opaque lighting glass, optical glass). Chlorine compounds may be used as fining agents for borosilicate glass production	The technique is generally applicable within the constraints of the quality requirements for the final product.
(iii) Dry or semi-dry scrubbing, in combination with a filtration system	The technique is generally applicable

Table 42

BAT-AELs for HCl and HF emissions from the melting furnace in the special glass sector

Parameter	BAT-AEL
The conversion factor of 2,5 × 10^–3 (see Table 2) has been used; with some values being approximated. A case-by-case conversion factor may have to be applied based on the type of production.
The higher levels are associated with the use of materials containing chlorine in the batch formulation.
The upper value of the range has been derived from specific reported data.
Parameter	mg/Nm³	kg/tonne melted glass^f2
Hydrogen chloride, expressed as HCl^f3	< 10 – 20	< 0,03 – 0,05
Hydrogen fluoride, expressed as HF	< 1 – 5	< 0,003 – 0,04^f4

Annotations

f1: A description of the techniques is given in Section 1.10.4.
f2: The conversion factor of 2,5 × 10^–3 (see Table 2) has been used; with some values being approximated. A case-by-case conversion factor may have to be applied based on the type of production.
f3: The higher levels are associated with the use of materials containing chlorine in the batch formulation.
f4: The upper value of the range has been derived from specific reported data.