Abstract: The combustion and flue gas treatment system includes a furnace for combusting a fuel with an oxidizer generating a flue gas, ducting for the flue gas connected to a NOx removal unit and a SOx removal unit, and a recirculation line for recirculating a part of the flue gas back to the furnace. The SOx removal unit is located upstream of the NOx removal unit with reference to the flue gas flow. The recirculation line is connected to the ducting downstream the SOx removal unit.

Abstract: The combustion system includes a boiler and a flue gas treatment system downstream of the boiler. The flue gas treatment system includes a desulphurization unit, a carbonator and a calciner defining a carbonator/calciner loop. The flue gas from the desulphurization unit is fed into the carbonator. No air pre-heaters, for pre-heating combustion oxidizer to be supplied into the boiler using heat of flue gas, are provided at the boiler and between the boiler and the carbonator.

Abstract: A system for reducing NOx in a flue gas stream, including an absorption element, a first inlet in fluid communication with the chamber configured to deliver a pressurized flue gas to the chamber, and a second inlet in fluid communication with the chamber configured to deliver an absorbing additive to the chamber. An outlet is in fluid communication with the chamber to exhaust from the chamber flue gas that has contacted the absorbing additive. A method for reducing NOx in a flue gas including the steps of: providing a flue gas in a chamber of an absorption element, providing an absorbing additive so that it contacts at least a portion of the flue gas, and exhausting at least a portion of the flue gas from the chamber.

Abstract: A system for reducing NOx in a flue gas stream, including an absorption element, a first inlet in fluid communication with the chamber configured to deliver a pressurized flue gas to the chamber, and a second inlet in fluid communication with the chamber configured to deliver an absorbing additive to the chamber. An outlet is in fluid communication with the chamber to exhaust from the chamber flue gas that has contacted the absorbing additive. A method for reducing NOx in a flue gas including the steps of: providing a flue gas in a chamber of an absorption element, providing an absorbing additive so that it contacts at least a portion of the flue gas, and exhausting at least a portion of the flue gas from the chamber.

Abstract: Disclosed herein is an apparatus comprising an absorption chamber; a flue gas stream inlet, the flue gas stream inlet being operative to dispose a flue gas stream in the absorption chamber, wherein the flue gas stream comprises nitrogen dioxide; an absorbing agent inlet, the absorbing agent inlet being operative to dispose an absorbent agent in the absorption chamber, the absorbing agent comprising an absorbing agent compound and a solvent, wherein the absorbing agent is chemically reactive with nitrogen dioxide to absorb nitrogen dioxide from the flue gas stream, forming a reaction product.