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(L/G) = exp ( -1.4352 + 0.1239*yCO2 + 3.4863*lean + 0.0174*CO2 – 0.0397*C + 0.0027*Tfg,in ) [adj. R2 = 0.92] (Q/L) = exp ( 2.5919 - 0.0059*yCO2 - 6.3536*lean + 0.0259*C-0.0015*CO2 ) (Tfg,out) = 41.15 + 0.062*Tfg,in + 1.307*yCO2 - 18.872*lean + 0.270*C ) (mwlean) = 16.907 + 2.333*lean + 0.204*C (ecomp) = -51.632 + 19.207*ln(PCO2 + 14.7) [adj. R2 = 0.96] [adj. R2 = 0.92] [adj. R2 = 0.95] [adj. R2 > 0.99] where, L = total sorbent flow rate (kmole/ hr) G = total inlet flue gas flow rate (kmole/ hr) (L/G) = total liquid (sorbent) applied per unit flue gas flow rate in absorber (ratio of molar flow rates) Q = total sorbent regeneration heat requirement (GJ/ hr) (Q/L) = total regeneration heat supplied per unit of sorbent flow (MJ/ kmole) yCO2 = CO2 concentration in the inlet flue gas (mole %) lean = lean sorbent CO2 loading (mole CO2/ mole MEA) CO2 = CO2 capture efficiency (%) C = MEA concentration in the sorbent (wt %) Tfg,in = Temperature of the flue gas entering the CO2 absorber (deg C) Tfg,out = Temperature of the flue gas leaving the CO2 absorber (deg C) mwlean = Average molecular weight of the lean sorbent (kg/ kmole sorbent) ecomp = Unit energy requirement for CO2 compression (kWh/ tonne CO2) PCO2 = Desired CO2 product pressure (psig) 3.5. Model Outputs The model has been built in Analytica, which specializes in propagation of uncertainties. The key outputs of the amine system performance model include: • MEA requirement. This depends mainly on the mass flow rate of CO2 in the flue gas, the desired CO2 capture efficiency, MEA concentration, and CO2 loadings in the solvent. Depending on the level of impurities in the flue gas, there is some loss of solvent. If the power plant does not have emission controls for SOx and NOx, the cost imposed due to amine loss may be significant. • Energy requirement. Heat for solvent regeneration is derived from low-pressure steam available in the power plant, which decreases power generation efficiency. Additional electrical Integrated Environmental Control Model - Technical Documentation • 24PDF Image | Amine Based CO2 Capture
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