# Commission Implementing Decision of 28 February 2012 establishing the best available techniques (BAT) conclusions under Directive 2010/75/EU of the European Parliament and of the Council on industrial emissions for the manufacture of glass (notified under document C(2012) 865) (Text with EEA relevance) (2012/134/EU), Division 57

Extent: E+W+S+N.I.

BAT is to reduce NOX emissions from the melting furnace by using one or a combination of the following techniques:
A description of the techniques is given in Section 1.10.2.
Technique
Applicability
(i) Combustion modifications
(a)
Reduction of air/fuel ratio
Applicable to air/fuel conventional furnaces.
Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry
(b)
Reduced combustion air temperature
Applicable only under installation-specific circumstances due to a lower furnace efficiency and higher fuel demand (i.e. use of recuperative furnaces in place of regenerative furnaces)
(c)
Staged combustion:
Air staging
Fuel staging
Fuel staging is applicable to most conventional air/fuel furnaces.
Air staging has very limited applicability due to the technical complexity
(d)
Flue-gas recirculation
The applicability of this technique is limited to the use of special burners with automatic recirculation of the waste gas
(e)
Low-NOX burners
The technique is generally applicable.
The achieved environmental benefits are generally lower for applications to cross-fired, gas-fired furnaces due to technical constraints and a lower degree of flexibility of the furnace.
Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry
(f)
Fuel choice
The applicability is limited by the constraints associated with the availability of different types of fuel, which may be impacted by the energy policy of the Member State
(ii)
Electric melting
Not applicable for large volume glass productions (> 300 tonnes/day).
Not applicable for productions requiring large pull variations.
The implementation requires a complete furnace rebuild
(iii)
Oxy-fuel melting
The maximum environmental benefits are achieved for applications at the time of a complete furnace rebuild
Table 47
BAT-AELs for NOX emissions from the melting furnace in the mineral wool sector
The conversion factors of 2 × 10–3 for glass wool and 2,5 × 10–3 for stone wool have been used (see Table 2).
The achievable levels depend on the quality of the natural gas and oxygen available (nitrogen content).
Parameter
Product
Melting technique
BAT-AEL
mg/Nm3
kg/tonne melted glass
NOX expressed as NO2
Glass wool
Fuel/air and electric furnaces
< 200 – 500
< 0,4 – 1,0
Oxy-fuel melting
Not applicable
< 0,5
Stone wool
All types of furnaces
< 400 – 500
< 1,0 – 1,25

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Source: https://www.legislation.gov.uk/eudn/2012/134/annex/division/5/division/1.7/division/1.7.2/division/57 (the official version)
Page: https://openlegislation.uk/eu-decision-2012-134/annex/division-5/division-1.7/division-1.7.2/division-57
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.