Revamp of existing sulphur recovery units for capacity increase and/or pollutant destruction by using oxygen, either to enrich or to replace combustion air.
In an air based Claus plant, nitrogen from the combustion air usually comprises more than half of the molar flow through the plant. By replacing air with oxygen, plant capacity can be increased significantly. The level of air enrichment with oxygen and, hence, the level of uprating, depend upon the feed gas composition.
- Oxygen enrichment up to 40%, corresponding to a plant capacity increase of about 50%, will be achieved by using a proprietary design burner. Some minor modifications to the Claus thermal reactor, waste heat boiler and condensers may be required
- At an oxygen enrichment level in excess of 40%, licensed technology will be used
Sulphur recovery efficiency for an oxygen-based Claus process is slightly better than that of air-based Claus because of the higher partial pressure of the reactants.
Siirtec Nigi's engineers are available to assess the existing plant in terms of configuration and performance and to suggest the most suitable solution to attain the benefits of oxygen-enrichment.