Sulphur Recovery Units (SRU’s)
A SRU incinerator is an oxidation-reduction reactor for the recovery of elemental Sulphur from H2S rich waste gases.
The first stage of the so called Claus process, is the complete free flame oxidation of typically ⅓ of the H2S to SO2 in a reaction furnace (H2S + 1½ O2 = SO2 + H2O). The SO2 and the then remaining H2S undergo the Claus reaction both in the reaction furnace and in a series of catalytic reactors (2 H2S + SO2 = 3S + 2 H2O) resulting in the overall chemical reaction H2S + ½ O2 = H2O + S.
Key features
- One combustion chamber with mixing wall
- Part of the waste containing H2S is injected through the burner, the remainder before the mixing wall
- The burner is a robust multifuel design suitable for the combined combustion of different waste gas and gaseous or liquid support fuel streams
- The mixing wall ensures the waste and combustion gases combine and also ensures a uniform temperature profile to improve the overall efficiency of the reaction
Key advantages
- Sulphur recovery
- Ultra low NOx combustion possible
- Complete oxidisation of all hydrocarbons
- No CO formation
- Complete odour destruction
- Destruction efficiency over 99,99%
- For waste air/gas streams containing a high percentage of H2S
