IECM 12.0 beta User Manual > Modules Included with the IECM > Integrated Gasification Combined Cycle (IGCC) Plant > SET PARAMETERS > CO2 Capture, Transport & Storage > 2. Ionic Liquid CO2 Capture >

Retrofit or Adjustment Factors

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See Retrofit or Adjustment Factor Inputs for an explanation of retrofit costs. The ionic liquid CO2 capture system has the following capital cost process areas:

•Absorbers: The IL-based absorbers use chemical absorption to capture CO2.

•Solvent Circulation Pumps: The CO2-lean solvent is pumped back to the absorber operating pressure by a solvent circulation pump.

•Absorption Intercoolers: Intercoolers are used to bring the ionic liquid temperature back down to the absorption operating temperature.

•Lean Solvent Coolers: Gases from the slump tank are recycled back into the absorber. A compressor is used to compress the gases to the operating pressure of the absorber.

•Solvent Regenerators: Thermal energy is used to regenerate the solvent.

•Rich & Lean Solvent Heat Exchangers: The CO2-rich solvent must be heated in order to strip off CO2 and regenerate the solvent. In addition, the regenerated solvent must be cooled down before it can be recirculated back to the absorber column. Heat exchangers are used to accomplish these two tasks. This area is a function of the solvent flow rate.

•Reboilers: The regenerator is connected to a reboiler, which is a heat exchanger that utilizes low pressure steam to heat the loaded solvent. The reboiler is part of the solvent regeneration cycle.

•Solvent Reclaimers: A portion of the sorbent stream is distilled in the reclaimer in order to avoid accumulation of heat stable salts in the sorbent stream. Caustic is added to recover some of the solvent in this vessel. The reclaimer cost is a function of the solvent makeup flow rate.

•Solvent Processing: The sorbent processing area primarily consists of a sorbent cooler, solvent storage tank, and a mixer. The regenerated sorbent is further cooled with the sorbent cooler and solvent added to make up for sorbent losses. This area is a function of the sorbent makeup flow rate.

•Steam Extractor: Steam extractors are installed to take low pressure steam from the steam turbines in the power plant. The cost is a function of the steam flow rate.

•CO2 Product Compressors: The product CO2 must be separated from the water vapor (dried) and compressed to liquid form in order to transport it over long distances. The multi-stage compression unit with inter-stage cooling and drying yields a final CO2 product at the nominal pressure of 2000 psig. This area is a function of the CO2 flow rate.

•Syngas Heat Exchangers: Heat exchangers are used to cool down inlet syngas when the absorption temperature is less than the inlet syngas temperature.

•CO2 Product Coolers: Heatexchangers are used to cool down CO2 product stream when the compression temperature is less than the CO2 product stream temperature.