OXYGEN APPLICATION IN CLAUS UNITS CHARGED WITH AN ADDITIONAL LOAD-PARTICULARLY A WASTE-GAS STREAM CONTAINING SO2 AND COMING FROM ADSORBENT REGENERATION

摘要

The present invention relates to a method removing sulphur from a fluid, comprising the steps of: - providing a first fluid comprising a sulphur-containing compound, - adsorbing the sulphur of said sulphur-containing compound onto an adsorbent, particularly in presence of hydrogen, - regenerating said adsorbent by oxidation of said adsorbed sulphur to sulphur dioxide thereby yielding an off-gas stream comprising sulphur dioxide, - providing a second fluid comprising hydrogen sulphide, - using said second fluid and said off-gas stream as reactants in a Claus process for producing elemental sulphur, €¢ wherein a part of hydrogen sulphide provided by said second fluid is oxidized to sulphur dioxide and water at an reaction temperature, €¢ wherein the residual hydrogen sulphide, the resulting sulphur oxide and said sulphur oxide provided by said off-gas stream are converted to elemental sulphur, €¢ wherein the oxygen required for said oxidation of said hydrogen sulphide provided by said second fluid is provided by an air stream, and €¢ wherein said off-gas stream dilutes said second fluid in said Claus process. According to the invention, it is provided that the Claus process is enriched with oxygen for maintaining said reaction temperature equal to or above 1100 °C.