IECM 12.0 beta User Manual > Modules Included with the IECM > Integrated Gasification Combined Cycle (IGCC) Plant > SET PARAMETERS > Gasifier Area > Shell >

Retrofit or Adjustment Factors

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See Retrofit or Adjustment Factor Inputs for an explanation of retrofit costs. The Shell gasifier has the following capital cost process areas:

•Coal Handling: Coal handling involves unloading coal from a train, storing the coal, moving the coal to the grinding mills, and feeding the gasifier with positive displacement pumps. A typical coal handling section contains one operating train and no spare train. A train consists of a bottom dump railroad car unloading hopper, vibrating feeders, conveyors, belt scale, magnetic separator, sampling system, deal coal storage, stacker, reclaimer, as well as some type of dust suppression system. Slurry preparation trains typically have one to five operating trains with one spare train. The typical train consists of vibrating feeders, conveyors, belt scale, rod mills, storage tanks, and positive displacement pumps to feed the gasifiers. All of the equipment for both the coal handling and the slurry feed are commercially available. A regression model was developed for the direct cost of coal handling and slurry preparation using the data collected for possible independent variables affecting direct capital cost. Coal feed rate to the gasifier on as-received basis is the most common and easily available independent variable. The direct cost model for the coal handling is based upon the overall flow to the plant rather than on a per train basis.

•Gasifier Area: The gasifier area of an IGCC plant contains gasifier, gas cooling, slag handling, and ash handling sections.

•Low Temperature Gas Cooling: The low temperature gas cooling section includes a series of three shell and tube exchangers. The number of operating trains are estimated based on the total syngas mass flow rate and the range of syngas flow rates per train used.

•Process Condensate Treatment: This model is based upon one data point from AP-5950. Because the treated process condensate is used as make-up to the gas scrubbing unit, and because blowdown from the gas scrubbing unit is the larger of the flow streams entering the process condensate treatment section, it is expected that process condensate treatment cost will depend primarily on the scrubber blowdown flow rate.

•Activated Carbon Injection: Activated carbon is used to remove mercury.