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Total moles of CO2 captured (nCO2) This is the molar flow rate of CO2 captured from the flue gas. It is obtained by multiplying the total CO2 content in the inlet flue gas (kmole CO2/ hr) by the CO2 capture efficiency of the system. nCO2 = (CO2 / 100)*(Moles CO2 in) = (CO2 / 100)*(G*yCO2) Since the molecular weight of CO2 is 44, the total amount of CO2 captured (mCO2, tonne/ hr) is mCO2 = nCO2 * (44/1000) CO2 product purity () The final CO2 product has to meet certain specifications depending upon the mode of transport and final destination. Impurities such as nitrogen are undesirable as they may pose problems during compression and liquefaction of CO2. In order to avoid corrosion in the pipelines during transport, the moisture levels have to be controlled. The acceptable level of purity of CO2 product for most of the applications is about 99.8%. Reboiler duty per mole of liquid (Q/L) This is the total amount of heat energy input required for the regeneration of the sorbent per unit of liquid circulated. This is mainly dependent on lean sorbent loading, CO2 capture efficiency, MEA concentration and CO2 content of the flue gas and is derived form the process simulation model. Total heat requirement for sorbent regeneration (Q) This is the total amount of heat energy required in the reboiler for sorbent regeneration. It is obtained by multiplying (Q/L) which is derived from the process simulation model, by the total sorbent circulation molar flow rate (MEA sorbent plus dilution water) in the CO2 capture system. Q = (Q/L) x (L) Unit heat of sorbent regeneration (qregen ) This is the amount of heat required for the regeneration of the MEA solvent (loaded with CO2) in the stripper/ regenerator section. It is expressed as amount of heat (in kJ or Btu) per unit mass (kg or lb) of CO2 captured. Theoretically, the heat of reaction that needs to be supplied in order to reverse the absorption reaction between CO2 and MEA is about 825 Btu/ lb CO2 (i.e. about 1900 kJ/ kg CO2). The actual amount of heat required for regeneration of the solvent is much higher (about 2-3 times higher than this theoretical minimum), mainly because of the large amount of latent heat taken up by the dilution water in the solvent. A wide range of numbers have been reported for the regeneration heat requirement of MEA system. Majority of the sources report a heat requirement of about 3800-4000 kJ/kg CO2. Here it is obtained by dividing the total heat requirement for sorbent regeneration (Q) by the total amount of CO2 captued (mCO2). qregen = Q / mCO2 Enthalpy of regenerating steam (qsteam) The regeneration heat is provided in the form of LP steam extracted from the steam turbine (in case of coal-fired power plants and combined-cycle gas plants), through the reboiler (a heat exchanger). In case of simple cycle natural gas fired power plants, a heat recovery unit maybe required. (hsteam) is the enthalpy or heat content of the steam used for solvent regeneration. Typically, the LP steam is around 300C and 60-80 psi. From the steam-tables, the enthalpy (heat content) of such steam is found to be about 2000 kJ/ kg steam. Integrated Environmental Control Model - Technical Documentation • 21PDF Image | Amine Based CO2 Capture
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