Patent ID: 6848375

Claim:
Method for converting by incineration the energy content in solid waste to other energy carriers, where the incinerator comprises a primary and at least one additional combustion chamber in which the primary combustion chamber incinerates the solid waste while the at least one additional combustion chamber finishes the combustion process by combusting the combustion gases exiting the first combustion chamber, characterised in that the oxygen flow in the primary and at least one additional combustion chambers are strictly controlled by separately regulating the flow of fresh air into each combustion chamber in at least one separately regulated zone and by ensuring that the entire combustion chambers are gas tight towards the surrounding atmosphere in order to eliminate penetration of false air into the chambers, that the temperatures in the primary and the at least one additional combustion chamber are strictly controlled, in addition to the regulation of the oxygen flow, by admixing a regulated amount of recycled flue gas with the fresh air which is being led into each of the chambers in each of the at least one separately regulated zones, that the gases which leave the combustion zone in the primary combustion chamber are led through at least a portion of the primary combustion chamber's content of solid waste before the gases exit the primary combustion chamber, and that there is employed a primary 1 and a secondary 30 combustion chamber, and that the regulation of the amount oxygen and the degree of admixture with recycled flue gas is performed in at least two independent inlets 16 or 31 , or in at least two independent groups of inlets 16 or 31 of the primary combustion chamber 1 and the secondary combustion chamber 30 , respectively.