Process and redox furnace for acid regeneration

A process for decomposing at least one of a spent sulfuric acid stream or other sulfur-containing stream in a RedOx furnace, the process comprising:

• supplying at least one of the spent sulfuric acid stream or the other sulfur-containing stream into a reduction chamber of the RedOx furnace;
• supplying a pure oxygen stream into the reduction chamber;
• at least partially decomposing the at least one spent sulfuric acid stream or the other sulfur-containing stream in the reduction chamber;
• supplying the at least partially decomposed at least one spent sulfuric acid stream or the other sulfur-containing stream into an oxidation chamber of the RedOx furnace;
• further decomposing the at least partially decomposed at least one spent sulfuric acid stream or the at least partially decomposed other sulfur-containing stream in the oxidation chamber;
• and
• increasing a capacity of the RedOx furnace for producing sulfur dioxide from the at least one spent sulfuric acid stream or other sulfur-containing stream without increasing volumetric flow rate of the RedOx furnace.

A process for decomposing at least one of a spent sulfuric acid stream or other sulfur-containing stream in a RedOx furnace, the process comprising:

• supplying at least one of the spent sulfuric acid stream or the other sulfur-containing stream into a reduction chamber of the RedOx furnace;
• supplying a pure oxygen stream into the reduction chamber;
• at least partially decomposing the at least one spent sulfuric acid stream or the other sulfur-containing stream in the reduction chamber;
• supplying the at least partially decomposed at least one spent sulfuric acid stream or the other sulfur-containing stream into an oxidation chamber of the RedOx furnace;
• further decomposing the at least partially decomposed at least one spent sulfuric acid stream or the at least partially decomposed other sulfur-containing stream in the oxidation chamber;
• and
• increasing a capacity of the RedOx furnace for producing sulfur dioxide from the at least one spent sulfuric acid stream or other sulfur-containing stream without increasing a temperature of exit gas from the RedOx furnace.

A process for decomposing at least one of a spent sulfuric acid stream or other sulfur-containing stream in a RedOx furnace, the process comprising:

• supplying at least one of the spent sulfuric acid stream or the other sulfur-containing stream into a reduction chamber of the RedOx furnace;
• supplying a pure oxygen stream into the reduction chamber;
• at least partially decomposing the at least one spent sulfuric acid stream or the other sulfur-containing stream in the reduction chamber;
• supplying the at least partially decomposed at least one spent sulfuric acid stream or the other sulfur-containing stream into an oxidation chamber of the RedOx furnace;
• further decomposing the at least partially decomposed at least one spent sulfuric acid stream or the at least partially decomposed other sulfur-containing stream in the oxidation chamber;
• and
• increasing a capacity of the RedOx furnace for producing sulfur dioxide from the at least one spent sulfuric acid stream or other sulfur containing stream without increasing NOx emissions.