IECM 12.0 beta User Manual > Modules Included with the IECM > Integrated Gasification Combined Cycle (IGCC) Plant > GET RESULTS > CO2 Capture, Transport & Storage > 2. Selexol CO2 Capture >

Capital Cost

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This is a standard capital cost result screen. The following process areas are shown:

•Absorbers: This is the series of columns where the syngas is made to contact with the Selexol solvent. Some of the CO2 is absorbed by the CO2-lean solvent at high pressure in the counter flow absorber. This process area PFC is a function of the solvent flow rate, the capture CO2 flow rate, and the inlet temperature.

•Power Recovery Turbines: The pressure energy in the CO2-rich solvent is recovered with one or two hydro turbines. This process area PFC is a function of the turbine horsepower and the turbine outlet pressure.

•Slump Tanks: H2, CO, and CH4 entrained or absorbed in the solvent is released in the slump tank and recycled back to the absorber. Because extra Selexol is used in the absorber, only a small amount of CO2 is released in the slump tank. This process area PFC is a function of the solvent flow rate.

•Recycle Compressors: The lean solvent is compressed and cooled in preparation for recycling back into the absorbers. This process area PFC is a function of the compressor horse power.

•Flash Tanks: Most of the CO2 absorbed by the solvent is recovered through flashing. The captured CO2 is then ready for transport and sequestration. To reduce the compression power, three flashing tanks with different pressures are used. There is no heat demand for solvent regeneration because solvent recovery is possible through flashing. This process area PFC is a function of the solvent flow rate.

•Selexol Pumps: The lean solvent fed back into the absorber via pumps. This process area PFC is a function of the pump horse power.

•Refrigeration: The solvent must be cooled down to the absorber operating temperature (30°F) by refrigeration. This process PFC is a function of the solvent flow rate and the temperature difference.

•CO2 Compressors: The CO2 from the flash tanks is compressed to high pressure (>1000psia) for storage using a multi-stage, inter-stage cooling compressor. This process area PFC is a function of the compressor horse power.

•Final Product Compressors: Compressed CO2 from the CO2 compressors must be further compressed to the final product pressure. This process area PFC is a function of the compressor horse power.

•Heat Exchangers: Gas-gas heat exchangers are used to extract heat from the syngas. This process PFC is a function of the heat load of the exchangers and the temperature difference across them.