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CO2 capture efficiency (CO2) The overall CO2 capture efficiency of the system is the fraction of CO2 present in the incoming flue gas stream captured in this system. CO2 = (Moles CO2 in - Moles CO2 out) / (Moles CO2 in) Most of studies report the CO2 capture efficiency of the amine-based systems to be 90%, with few others reporting as high as 96% capture efficiency. Here, it has been assumed to be 90% as nominal value, but the user can specify the desired level of CO2 capture efficiency. MEA concentration (CMEA) The solvent used for CO2 absorption is a mixture of monoethanolamine (MEA) with water. MEA is a highly corrosive liquid, especially in the presence of oxygen and carbon dioxide, and hence needs to be diluted. Today the commercially available MEA-based technology supplied by Fluor Daniel uses 30% w/w MEA solvent with the help of some corrosion inhibitors. Other suppliers, who do not use this inhibitor, prefer to use lower MEA concentrations in the range of 15%-20% w/w. Here we use 30% as the nominal value for the solvent concentration and the user may choose any value between 15-40%. Lean solvent CO2 loading (min) Ideally, the solvent will be completely regenerated on application of heat in the regenerator section. Actually, even on applying heat, not all the MEA molecules are freed from CO2. So, the regenerated (or lean) solvent contains some “left-over” CO2. The level of lean solvent CO2 loading mainly depends upon the initial CO2 loading in the solvent and the amount of regeneration heat supplied, or alternatively, the regeneration heat requirement depends on the allowable level of lean sorbent loading. Here we use a nominal value of 0.2 based on the values reported in the literature, and the user may specify any desired value in the range (0.05-0.3). Liquid to gas ratio (L/G) The liquid to gas ration is the ratio of total molar flow rate of the liquid (MEA sorbent plus water) to the total molar flow rate of flue gas being treated in the absorber. This is one of the parameters derived by the process simulation model. Liquid flow rate (L) The liquid flow rate is the total molar flow rate of sorbent plus dilution water being circulated in the CO2 capture system. It is obtained by multiplying (L/G) which is derived from the process simulation model, by the total flue gas flow rate (G) entering the CO2 capture system. L = (L/G)x(G) Removal efficiency (acid gas) and stoichiometric MEA loss (nMEA,acidgas) As discussed before, MEA is an alkaline solvent that has strong affinity for various acid gases. In fact, gases such as hydrogen chloride and oxides of sulfur are much more reactive towards MEA than carbon dioxide itself. Also, these gases form heat stable salts (HSS) with MEA that can not be regenerated even after application of heat. So, they cause a (permanent) loss of MEA solvent that may be estimated according the stoichiometry of their reactions with MEA. The typical removal efficiencies of these gases in the absorber using MEA solvent designed for 90% removal of CO2 are given in Table 3. Integrated Environmental Control Model - Technical Documentation • 18PDF Image | Amine Based CO2 Capture
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