In waste sulfuric acid recovery processes, using oxygen as the oxidizing medium can significantly reduce the nitrogen load introduced by air. With more space in the system occupied by sulfur dioxide-containing process gas, sulfuric acid production capacity is substantially increased, production bottlenecks are eliminated, and heat losses are reduced, lowering the unit energy consumption per kilogram of sulfuric acid. This also improves product quality. In Claus processes, the oxygen-enriched process can substantially increase unit capacity, resolving production bottlenecks with relatively low investment. Even when feedstock sulfur content increases, it can simultaneously meet increasingly stringent sulfur dioxide emission control requirements. Additionally, oxygen enrichment raises reaction temperatures, accommodating various feedstock qualities and facilitating the decomposition of nitrogen-containing harmful by-products. Capacity adjustment is flexible, enabling peak-shaving production during summer months. Introducing nitrogen into sulfur pit degassing operations is a safety protection measure that prevents the accumulation of toxic hydrogen sulfide in liquid sulfur, while also preventing the formation of explosive hydrogen sulfide-air mixtures.
