IECM 12.0 beta User Manual > Modules Included with the IECM > Pulverized Coal (PC) Plant > GET RESULTS > CO2 Capture, Transport & Storage > 1. Ammonia System >

Capital Cost

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This is a standard capital cost result screen. The ammonia system in PC and NGCC plants has the following process areas:

•Direct Contact Coolers: A direct contact cooler is a large vessel where the incoming hot flue gas is placed in contact with cooling water. The cost is a function of the gas flow rate and temperature of the flue gas.

•Flue Gas Blower: The flue gas enters the bottom of the absorber column and flows upward, countercurrent to the sorbent flow. Blowers are required to overcome the substantial pressure drop as it passes through a very tall absorber column. The cost is a function of the volumetric flow rate of the flue gas.

•Chiller System: The total cost for the Chiller System is based on the chilling loads required by the ammonia-based CO2 capture system.

•CO2 Absorber Vessel: This includes absorber towers and circulating water pumps.

•Heat Exchangers: The CO2-loaded sorbent must be heated in order to strip off CO2 and regenerate the sorbent. In addition, the regenerated sorbent 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 sorbent flow rate.

•Circulation Pumps: This includes solvent circulation pumps and cooling water circulation pumps.

•Sorbent Regenerator: This includes the CO2 stripper and regeneration reboiler.

•Ammonia Water Wash: A water wash is used to remove ammonia from absorber gasses before they are released to the stack.

•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.

•Sorbent Processing and Reclaimer: This section prepares the sorbent for reuse.

•Drying and Compression Unit: 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.

•NH3 Stripping: This includes the NH3 stripper and cleanup pumps.

•Auxiliary Gas Boiler: An auxiliary natural gas boiler is typically combined with a steam turbine to generate some additional power and/or low pressure steam. The cost is a function of the steam flow rate generated by the boiler. The boiler cost is lower if electricity is not being produced.

•Auxiliary Steam Turbine: The steam turbine is used in conjunction with the natural gas boiler to generate some additional power and/or low pressure steam. The cost is a function of the secondary power generated by the turbine.