When oxygen is used as the oxidising medium, the nitrogen burden of the air is reduced and replaced by process gas containing sulphur dioxide, which can lead to a considerable increase in sulphuric acid production.
- Increase in performance (Debottlenecking) of existing plants
- Reduced heat losses
- Flue gas conditioning
- Increase in turnover and yield
- Lower energy costs
- Improved product quality
Table: Comparison of waste sulphuric acid process with and without oxygen input:
|without O2||with O2|
|quantity of spent sulphuric acid [%]||100||152|
|spec. energy consumption [kcal/KG SA]||2421||1724|
|air flow rate total [m3/h]||3500||3500|
|O2 flow rate total [m3/h]||0||327|
|spec. O2 consumption [m3/t SA]||0||252|
|O2 concentration equivalent [% Vol]||21||27,8|
The use of oxygen allows a significant increase in production and reduces the specific energy consumption per kg of sulphuric acid.