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

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