System for sulphur removal from a flue gas

A system for sulphur removal from a flue gas, the system comprising

• an absorber comprising a vessel having an inlet and an outlet for the flue gas, nozzles for spraying a slurry through the flue gas and a slurry accumulation zone at the lower part of the absorber;
• a reaction tank having an oxidizing gas supply into it and connected to the slurry accumulation zone and comprising a curved plane section;
• a buffer tank connected to the reaction tank and to the nozzles, for receiving the slurry from the reaction tank and supply the nozzles with the slurry,
• wherein
• the slurry accumulation zone is connected to the reaction tank by a duct comprising a gas lock, and
• a communicating vessel passage is disposed between and connects the buffer tank and the reaction tank, wherein the communicating vessel passage is tangentially connected to the reaction tank and the buffer tank.