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Based on 750 lb coal/hr per gross MW produced and the 646,589 lb coal/hr flow rate of coal, the plant in Case 10 should produce approximately 862 MW gross absent the CO2 capture system. Therefore, 862 MW-680MW = approximately 182 gross MW lost due to the CO2 capture system For NETL Case 10, the subcritical plant with the CO2 capture system, 1,995,300 lb steam/hr of quality 1397.7 Btu/lb is diverted from the low pressure turbine and this steam flows to the reboiler of the advanced amine-based CO2 capture unit. Therefore, the Heat-to-Electricity Conversion Efficiency can be calculated as: 182[MW] ∗1397.7[Btu/lbsteam]∗2.93E−7[MW/(Btu/hr)] = 0.222or22%, 1995300[lb steam/hr] Where 2.93E-7 [MW/(Btu/hr)] equals the MW equivalent of 1 Btu/hr. Similar results are shown using NETL Cases 11 and 12 for supercritical plants. In the new version of the IECM, the Heat-to-Electricity Conversion Efficiency as well as the steam quality parameters were updated for both the MEA and Advanced Amine CO2 capture systems to reflect these results. Updated Equivalent Electrical Loss Due to the Capture System In previous versions of the IECM, the electrical equivalent loss (energy penalty) from the conventional CO2 capture system was based on multiplying the regeneration energy requirement by the Heat-to-Electricity Conversion Efficiency. In the updated version of the IECM, this calculation was modified to reflect a more realistic process. The electrical equivalent loss (MW) due to the steam requirements in the reboiler are calculated in two steps, first by calculating the steam flow rate directly, and then by using this value and the Heat-to-Electricity Conversion Efficiency to calculate the electrical equivalent loss: 1. The steam flow rate is calculated as: ERegeneration ∗ CO2Flow MSteam Flow = Enthalpy Steam Inlet − Enthalpy Steam Condensate Where: ̇ MSteam Flow = Steam Flow Rate [lb/hr] ERegeneration = Regeneration Heat Energy [Btu/ lb CO2] CO2Flow = Flow Rate of CO2 Captured [lb CO2/hr] Enthalpy Steam Inlet = Enthaly of Steam at Reboiler Inlet [Btu/lb CO2] Enthalpy Steam Inlet = Enthalpy of Steam at Reboiler Outlet [Btu/lb CO2] 2. The equivalent electrical loss (MW) is calculated as: Where: ̇ ̇ MWEq. = (Heat − to − Electricity Efficiency) ∗ MSteam Flow ∗ Enthalpy Steam Inlet ∗ 2.97E−7 Integrated Environmental Control Model - Technical Documentation • 42PDF Image | Amine Based CO2 Capture
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