Patent ID: 8518366

Claim:
A process for combustion of at least one sulphur compound, said process comprising: passing combustion gas through a combustion apparatus which comprises at least two combustion zones following one another in a direction of flow of the combustion gas, wherein, in each combustion zone at least one sulphur compound is injected into the combustion gas, wherein each combustion zone is cooled, and wherein, downstream of each combustion zone, a heat exchanger is connected via which reaction gas is cooled in such a manner that a maximum temperature in each combustion zone does not exceed 2000° C., wherein at least one nozzle for injecting said at least one sulphur compound into said combustion zones are externally cooled by a gas that has a concentration of oxygen which is lower than the concentration of oxygen in said combustion gas entering into said combustion apparatus, and wherein the gas enters into said combustion zones and leads to a reduction of the concentration of oxygen in the immediate vicinity of a tip of the nozzle.