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
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One combustion chamber with mixing wall > optimised chemistry
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Short flame > ultra-low NOx
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Flame contained in burner housing > economical design
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Double swirl > high intensity mixing
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Internal recirculation > uniform reactions
Advantages
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Ultra-low NOx and CO (<80 and <5 mg/Nm³ resp)
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Ultra-pure S
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No ammonia sulphate contaminations
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
