Division 50

United Kingdom

When nitrates are used in the batch formulation, BAT is to reduce NO_X emissions by minimising the use of these raw materials, in combination with either primary or secondary techniques

Technique^f1	Applicability
A description of the technique is given in Section 1.10.2.
Primary techniques
minimising the use of nitrates in the batch formulation The use of nitrates is applied for very high quality products, where special characteristics of the glass are required. Effective alternative materials are sulphates, arsenic oxides, cerium oxide	The substitution of nitrates in the batch formulation may be limited by the high costs and/or higher environmental impact of the alternative materials

Table 40

BAT-AELs for NO_X emissions from the melting furnace in the special glass sector when nitrates are used in the batch formulation

Parameter	BAT	BAT-AEL^f2
The lower levels are associated with the use of electric melting.
The conversion factors of 2,5 × 10^–3 and 6,5 × 10^–3 have been used for the determination of the lower and upper value of the BAT-AEL range respectively, with values being approximated. A case-by-case conversion factor may have to be applied based on the type of production (see Table 2).
Parameter	BAT	mg/Nm³	kg/tonne melted glass^f3
NO_X expressed as NO₂	Minimisation of nitrate input in the batch formulation combined with primary or secondary techniques	< 500 – 1 000	< 1 – 6

Annotations

Footnotes

f1: A description of the technique is given in Section 1.10.2.
f2: The lower levels are associated with the use of electric melting.
f3: The conversion factors of 2,5 × 10^–3 and 6,5 × 10^–3 have been used for the determination of the lower and upper value of the BAT-AEL range respectively, with values being approximated. A case-by-case conversion factor may have to be applied based on the type of production (see Table 2).