Division BAT 48 In order to prevent or reduce NOX emissions to air from the combustion of iron and steel process gases in CCGTs, BAT is to use one or a combination of the techniques given below.
United Kingdom
| Technique | Description | Applicability | |
|---|---|---|---|
| a. | Process gas management system | See description in Section 8.2 | Generally applicable within the constraints associated with the availability of different types of fuel |
| b. | Advanced control system | See description in Section 8.3. This technique is used in combination with other techniques | The applicability to old combustion plants may be constrained by the need to retrofit the combustion system and/or control command system |
| c. | Water/steam addition | See description in Section 8.3. In dual fuel gas turbines using DLN for the combustion of iron and steel process gases, water/steam addition is generally used when combusting natural gas | The applicability may be limited due to water availability |
| d. | Dry low-NOX burners(DLN) | See description in Section 8.3. DLN that combust iron and steel process gases differ from those that combust natural gas only | Applicable within the constraints associated with the reactiveness of iron and steel process gases such as coke oven gas. The applicability may be limited in the case of turbines where a retrofit package is not available or when water/steam addition systems are installed |
| e. | Low-NOX burners (LNB) | See description in Section 8.3 | Only applicable to supplementary firing for heat recovery steam generators (HRSGs) of combined-cycle gas turbine (CCGT) combustion plants |
| f. | Selective catalytic reduction (SCR) | Retrofitting existing combustion plants may be constrained by the availability of sufficient space | |