Process for the regeneration of a catalyst plant and apparatus for performing the process

Process for regeneration of a catalyst plant for treatment of a flue gas from a gas turbine, the catalyst plant including a SCOSOx catalyst for removal of SO2 from the flue gas, and arranged downstream thereof, a SCONOx catalyst for removal of NOx from the flue gas, in which a regenerating gas including molecular hydrogen or hydrocarbons is conducted through the SCOSOx catalyst and the SCONOx catalyst, the process comprising the steps of:

• (a) extracting regenerating gas downstream of the SCONOx catalyst and introducing the extracted regenerating gas between the SCOSOx catalyst and the SCONOx catalyst;
• and
• (b) introducing fresh regeneration gas between the SCOSOx catalyst and the SCONOx catalyst and extracting the fresh regenerating gas upstream of the SCOSOx catalyst,
• wherein step (a) and step (b) are performed simultaneously.

Process for regeneration of a catalyst plant for treatment of a flue gas from a gas turbine, the catalyst plant including a SCOSOx catalyst for removal of SO2 from the flue gas, and arranged downstream thereof, a SCONOx catalyst for removal of NOx from the flue gas, in which a regenerating gas including molecular hydrogen or hydrocarbons is conducted through the SCOSOx catalyst and the SCONOx catalyst, the process comprising the steps of:

• (a) extracting regenerating gas between the SCOSOx catalyst and the SCONOx catalyst and introducing the extracted regenerating gas upstream of the SCOSOx catalyst;
• and
• (b) introducing fresh regenerating gas downstream of the SCONOx catalyst and extracting the introduced fresh regenerating gas between the SCOSOx catalyst and the SCOSOx catalyst during the step of introducing the extracted regenerating gas
• wherein step (a) and step (b) are performed simultaneously.

Process for regeneration of a catalyst plant for treatment of a flue gas from a gas turbine, the catalyst plant including a SCOSOx catalyst for removal of SO2 from the flue gas, and arranged downstream thereof, a SCONOx catalyst for removal of NOx from the flue gas, in which a regenerating gas including molecular hydrogen or hydrocarbons is conducted through the SCOSOx catalyst and the SCONOx catalyst, the process comprising:

• maintaining a recirculating flow of the regenerating gas through a first catalyst;
• maintaining a linear flow of the regenerating gas through a second catalyst;
• and
• controlling the recirculating flow and the linear flow to substantially prevent the regenerating gas that has passed through the SCOSOx catalyst from passing through the SCONOx catalyst,
• wherein when the first catalyst is the SCOSOx catalyst, the second catalyst is the SCONOx catalyst, and when the first catalyst is the SCONOx catalyst, the second catalyst is the SCOSOx catalyst.