Integrated Gasification Combined Cycle (IGCC) - National Energy ...

Gasification Losses
Table A-18: IGCC Water Loss by Function
Function gpm Gal/MWh Electricity
Water Lost in Gasification Shift 158 18.2
Ash Handling Blowdown 81.1 9.3
Water with Slag 32 3.7
Water loss in COS Hydrolysis 0.5 0.1
Water Treatment Effluent 22.2 2.5
Flue Gas Loss
GT Flue Gas 912.6 104.8
Cooling Water Losses
Cooling Tower Blowdown 808.8 92.9
Cooling Tower Evaporation 2,428 278.9
Total 4,443 510
Appendix: IGCC-LCA
It is important to note that the cooling water demand in the Baseline Report is based on an IGCC
power plant located in the Midwestern United States; the IGCC plant in this study is assumed to
be in Mississippi. The differences in elevation and ambient conditions between the two locations
would result in differences in cooling water needs. This is noted as a data limitation in this study
as no changes were made to the Baseline Report water data to account for the difference in
location.
A.1.4
Life Cycle Stage #3, Case 2: IGCC Energy Conversion Facility
with CCS
Stage #3, Case 2 includes the commissioning, construction, operation, and decommissioning of a
556-MWe net output IGCC plant with CCS; as with the operation of the IGCC plant without
CCS most data were taken directly from the Baseline Report.
A.1.4.1 GaBi Plan
Figure A-16 defines the second level GaBi plan for the IGCC case with CCS. This plan is based
on a reference flow of 1 MW electricity output. The addition of the pipeline third level plan is
the main differences between Stage #3 in the two cases. Assumptions on the
commissioning/decommissioning, construction, and operation of the pipeline are included in the
following sections.
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