Division BAT 43 In order to prevent or reduce NOX emissions to air from the combustion of natural gas in engines, BAT is to use one or a combination of the techniques given below.
United Kingdom
| Technique | Description | Applicability | |
|---|---|---|---|
| a. | Advanced control system | See description in Section 8.3. This technique is often used in combination with other techniques or may be used alone for combustion plants operated < 500 h/yr | The applicability to old combustion plants may be constrained by the need to retrofit the combustion system and/or control command system |
| b. | Lean-burn concept | See description in Section 8.3. Generally used in combination with SCR | Only applicable to new gas-fired engines |
| c. | Advanced lean-burn concept | See descriptions in Section 8.3 | Only applicable to new spark plug ignited engines |
| d. | Selective catalytic reduction (SCR) | Retrofitting existing combustion plants may be constrained by the availability of sufficient space. Not applicable to combustion plants operated < 500 h/yr. There may be technical and economic restrictions for retrofitting existing combustion plants operated between 500 h/yr and 1 500 h/yr | |