The Sulphur Recovery (Mono-Claus) Plant at ArcelorMittal recovers elemental sulphur from “sour’ gas (treated coke oven gas) that is generated during the production of metallurgical coke. The recovery process requires high temperature combustion and catalytic conversion of H2S to ensure maximum recovery of sulphur thus reducing the impact on the environment. The feed sour gas is directed to the SRP from various sources at a mass flow rate of up to 7000 kg/hr. Liquid sulphur production is dependant on the quality and quantity of the sour gas but is typically in the region of 450 kg/hr.
The sour gas is pre-treated to remove excess ammonia, and then directed to the Mono-Claus Kiln where it is combusted and mixed with air to ensure all the sulphur is oxidised and any remaining ammonia is cracked. The combusted gas transfers to the Claus Reactor where sulphur is produced in the catalyst bed. Liquid sulphur is recovered from the sulphur condenser and the sulphur separator. The tail gas leaving the Mono-Claus Plant is ducted to the coke oven gas mains. Excess energy is recovered from the kiln by a medium pressure boiler. All instrumentation, drives and process control requirements are managed by the dedicated PLC/SCADA system in the Plant. The Plant is fully automated and requires minimal operator involvement.