Combined SO2/NOx removal processes remain considered fairly complex and costly. However, emerging technologies have the potential to reduce SO2 and NOx emissions for less than the combined cost of conventional FGD B for SO2 control and selective catalytic reduction (SCR) B for NOx control. Most processes are in the development stage, although some processes are commercially used on low to medium-sulphur coal-fired plants.

Click on the relevant text below for other FGD technologies:

• wet scrubbers
• spray dry scrubbers
• sorbent injection processes
• dry scrubbers
• regenerable systems
• combined SO2/NOx removal processes