Absorption Section Design Analysis
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In this chapter, the design of the absorption section of an industrial CO2 post-combustion capture system using MEA as solvent is analyzed. After the process description, the gas and liquid feed streams are characterized. A two-steps procedure is adopted for the design. Initially, the minimum number of units and the minimum solvent flow rate are determined, then the role of the temperature bulge in the absorber design is discussed. The influence of the molar L/V ratio, which affects the amount of solvent to be used in the process, is studied by means of the analysis of the liquid temperature profiles. Then, the effective solvent flow rate and column dimensions are evaluated. The proposed design procedure for the absorber is proved to avoid the presence of isothermal zones in the column, guarantying the use of the entire packing.
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