System and method for controlling scale build-up in a wfgd

A scale prevention system for a wet flue gas desulfurization unit, the system comprising:

• a flue structure, wherein the flue structure is connected to a flue inlet of a wet flue gas desulfurization unit and the flue structure has a cross-sectional shape selected from a rectangle or a square;
• at least two air nozzles, each air nozzle having a respective air supply line, wherein at least one air nozzle is positioned on each opposite vertical interior wall of the flue structure so as to provide air coverage across the horizontal width of a flue inlet to the wet flue gas desulfurization unit;
• and
• at least two lateral air nozzles, each lateral air nozzle having a respective air supply line, wherein each lateral air nozzle is positioned internally of each of the at least two air nozzles and are positioned at the top edge of the flue inlet to the wet flue gas desulfurization unit so as to provide air coverage across the horizontal width of the flue inlet to the wet flue gas desulfurization unit.

A scale prevention system for a wet flue gas desulfurization unit, the system comprising:

• a flue structure, wherein the flue structure is connected to a flue inlet of a wet flue gas desulfurization unit;
• at least two air nozzles, each air nozzle having a respective air supply line;
• and
• at least two chill plates, each chill plate having a respective supply line,
• wherein the combination of the at least two air nozzles and the at least two chill plates are positioned on the interior of the flue structure so as to provide temperature control across the horizontal width of a flue inlet to the wet flue gas desulfurization unit.

A scale prevention system for a wet flue gas desulfurization unit, the system comprising:

• a flue structure, wherein the flue structure is connected to a flue inlet of a wet flue gas desulfurization unit;
• at least two air nozzles, each air nozzle having a respective air supply line, wherein at least one air nozzle is positioned on each opposite vertical interior wall of the flue;
• at least two lateral air nozzles, each lateral air nozzle having a respective air supply line, wherein each lateral air nozzle is positioned internally of each of the at least two air nozzles and are positioned at the top edge of the flue inlet to the wet flue gas desulfurization unit;
• and
• at least two chill plates, each chill plate having a respective supply line, wherein the at least two chill plates are positioned on the interior of the flue,
• wherein the combination of the at least two air nozzles, the at least two lateral air nozzles and the at least two chill plates are positioned on the internal surfaces of the flue structure so as to provide temperature control across the horizontal width of a flue inlet to the wet flue gas desulfurization unit.