IECM 12.0 beta User Manual > Modules Included with the IECM > Integrated Gasification Combined Cycle (IGCC) Plant > SET PARAMETERS > Sulfur Removal > Sulfinol Sulfur Capture System >

Performance

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Inputs for the performance of the Sulfinol sulfure capture system are entered on the Performance parameter screen.

The acid gas removal system employs the Sulfinol process for selective removal of hydrogen sulfide (H2S) and carbonyl sulfide (COS). A hydrolyzer is used to convert the captured COS to H2S in preparation for the stripping of H2S from the solvent, along with sour gas from the process water treatment unit. This concentrated gas stream is then sent to the Claus sulfur plant for recovery of elemental sulfur.

The following parameters are displayed:

•Hydrolyzer (or Shift Reactor):

•COS to H2S Conversion Efficiency: This is the efficiency with which carbonyl sulfide is converted to hydrogen sulfide.

•Sulfinol Sulfur Removal Unit:

•H2S Removal Efficiency: This is the removal efficiency of H2S from the inlet syngas stream. The H2S is removed by an absorption process that is very effective at capture of H2S.

•COS Removal Efficiency: This is the removal efficiency of COS. The absorption process is not very effective at capturing COS, so the removal efficiency default is very low.

•CO2 Removal Efficiency: This is the removal efficiency of CO2 for the sulfur recovery system. This system is optimized to capture sulfur-bearing components of a syngas, but maintains an affinity for CO2. The CO2 removed is eventually vented to the atmosphere from the Beavon-Stretford technology.

•Maximum Syngas Capacity per Train: This is the maximum flow rate of one Selexol-based sulfur recovery vessel. It is used to determine the number of absorber vessels required to treat the syngas.

•Number of Operating Absorbers: This is the number of absorbers required to treat the entire syngas stream. It is used primarily to determine the cost of the sulfur control area. This must be an integer.

•Power Requirement: This is the equivalent electrical output of thermal (steam) energy used for reheat, plus the actual electrical output power required. It is calculated as a function of the syngas flow rate.

•Claus Plant:

•Sulfur Recovery Efficiency: This is the recovery efficiency of the Claus Plant in converting H2S to elemental sulfur.

•Max Sulfur Capacity per Train: This is the maximum capacity of elemental sulfur from one Claus train.

•Number of Operating Absorbers: The number of trains is estimated from the recovered sulfur mass flow rate and the allowable range of recovered sulfur mass flow rate per train. This must be an integer.

•Tailgas Treatment: (Note: The number of trains for this area is the same as the number of trains for the Claus plant process area.)

•Sulfur Recovery Efficiency: This is the recovery efficiency of the Beavon-Stretford plant in generating elemental sulfur. The remainder is oxidized to SO2 and sent to a stack.