Sulphur Recovery Case Study

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Theory of the process The sulphur recovery unit is designed to recover sulphur from the sour vapours originating from the following sources: • The Amine Treatment unit. • The sour water stripper unit. The process design is based on the superclaus process to recover elementary sulphur from an H2S containing gas stream. The process is combination of the conventional Claus process and SuperClaus process which is oxidation of hydrogen sulphide to sulphur. The SRU consists of thermal stage, in which H2S is partially burnt with air, followed by three catalytic Claus stages and a catalytic SuperClaus stage. Facilities are provided for continuous degasification of produced sulphur to reduce its H2S content. Finally liquid sulphur is solidificated…show more content…
This is favourably high to obtain a good COS and CS2 conversion in the bottom of the catalyst bed. The reactor inlet temperature could be increased in case the COS and CS2 conversion is not sufficiently high. The H2S and SO2 react over the catalyst until equilibrium is…show more content…
Again liquid sulphur is produced during gas cooling in the condenser. Also here LP steam is generated. The process gas passes to the second steam reheater after which it is again subjected to conversion in the second Claus reactor and cooling in the third sulphur condenser. The inlet temperature of the second Claus reactor is 205 C, which is lower than in the first reactor and promotes a high conversion of H2S and SO2 into sulphur. At low plant throughput (below 40%) the inlet temperature should be increased to 215 C to avoid sulphur condensation on the bed. The process gas passes to the third steam reheater after which it is once again subjected to conversion in the third Claus reactor and cooling in the fourth sulphur condenser. The inlet temperature of the third Claus reactor is 195 C, which lower than in the first two reactors and promotes a high conversion of H2S and SO2 into sulphur. At low plant throughput (below 40%) the inlet temperature should be increased to 205 C to avoid condensation on the

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