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Table 3. Removal Efficiency of Acid Gases Due to MEA Solvent (90% CO2 removal) Acid gas SO2 SO3 NO2 NO HCl removal efficiency (%) SO2 = 99.5% SO3 = 99.5% NO2 = 25% NO = 0 HCl = 95% MEA loss (mole MEA/mole acid gas) nMEA, SO2 = 2 nMEA,SO3 = 2 nMEA, NO2 = 2 nMEA, NO =0 nMEA,HCl = 1 Temperature of the flue gas entering the CO2 capture system (Tfg,in) The desirable temperature of the flue gas entering the CO2 capture system is about 45-50 deg C. If a direct contact cooler is installed upstream of CO2 capture system, then this temperature level may be achieved. Else, this is same as that obtained from the base plant. The temperature of the flue gas affects the absorption reaction (absorption of CO2 in MEA solvent is an exothermic process favored by lower temperatures). Also, the volumetric flow rate of the flue gas stream, which is a key determinant of the sizes of various equipments (direct contact cooler, flue gas blower, absorber), is directly related to the flue gas temperature. Nominal MEA loss ( m• MEA, nom) MEA is a reactive solvent. In spite of dilution with water and use of inhibitors, a small quantity of MEA is lost through various unwanted reactions, mainly the polymerization reaction (to form long-chained compounds) and the oxidation reaction forming organic acids and liberating ammonia. In general, this nominal loss of MEA is estimated as about 1.5 kgMEA/ mton CO2. It is also assumed that 50 % of this MEA loss is due to polymerization: m• MEA, polym = = 50% of m• MEA, nom) and the remaining 50% of the MEA loss is due to oxidation to acids: m• MEA, oxid = 50% of m• MEA, nom). NH3 Generation (nNH3) The oxidation of MEA to organic acids (oxalic, formic, etc.) also leads to formation of NH3. Each mole of MEA lost in oxidation, liberates a mole of ammonia (NH3). Rate of ammonia generation, nNH3 = 1 mole NH3 mole MEA oxidized Integrated Environmental Control Model - Technical Documentation • 19PDF Image | Amine Based CO2 Capture
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