Division 33
United Kingdom
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. | |
| Techniquef1 | 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 to air/fuel conventional furnaces within the constraints of the furnace energy efficiency and higher fuel demand. Most furnaces are already of the recuperative type. |
| (c) Staged combustion:
| Fuel staging is applicable to most air/fuel, oxy-fuel furnaces. Air staging has very limited applicability due to its 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. 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) Oxy-fuel melting | The maximum environmental benefits are achieved for applications at the time of a complete furnace rebuild |
Table 23
BAT-AELs for NOX emissions from the melting furnace in the continuous filament glass fibre sector
| The conversion factor reported in Table 2 (4,5 × 10–3) has been applied. | |||
| The achievable levels depend on the quality of the natural gas and oxygen available (nitrogen content). | |||
| Parameter | BAT | BAT-AEL | |
|---|---|---|---|
| mg/Nm3 | kg/tonne melted glass | ||
| NOX expressed as NO2 | Combustion modifications | < 600 – 1 000 | < 2,7 – 4,5f2 |
| Oxy-fuel meltingf3 | Not applicable | < 0,5 – 1,5 | |
Annotations
Footnotes
- f1
-
A description of the techniques is given in Section 1.10.2.
- f2
-
The conversion factor reported in Table 2 (4,5 × 10–3) has been applied.
- f3
-
The achievable levels depend on the quality of the natural gas and oxygen available (nitrogen content).