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CHAPTER II TWO STAGE CO2 ADSORPTION COMPRESSOR DESIGN AND MODELING 2.1 Introduction The two-stage CO2 adsorption compressor is an air revitalization subsystem6 utilizing the fundamentals of both temperature and vacuum-swing adsorption. The first stage removes CO2 from the dry process feed stream. The adsorbent bed is then regenerated by being subjected to heat and vacuum, simultaneously feeding the second stage which operates under the principles of temperature swing adsorption (TSA).4 The second stage is then heated, producing compressed CO2 regulated by the amount of energy supplied to the adsorbent bed. TSA compression uses the enthalpy of adsorption to control a sorbent’s capac- ity for the desired separation, compression, and delivery of gases. A TSA adsorbent bed is composed of a material that preferentially adsorbs one component in a process stream. A typical TSA compression cycle, shown in figure 2.1, consists of four stages for the compression of a gas: adsorption, compression, production, and depressuriza- tion. Following the cycle outline in figure 2.1,7 we begin at a low pressure and low temperature point on an isotherm curve representing a cool regenerated sorption bed. During the adsorption step, a process stream is passed through the bed in which a pure component is selectively adsorbed until the bed is saturated. During this step, the bed is maintained isothermal by a cooling media flowing around it to remove the latent heat of adsorption. When the bed saturates it is closed off from the feed stream. In the compression step, energy is added to the isolated bed by means of heat. Assuming there is limited volume inside the adsorption bed, the bed is heated and pressurized with a negligible change in loading. Energy is continually added until a 7PDF Image | TEMPERATURE SWING ADSORPTION COMPRESSION AND MEMBRANE SEPARATIONS
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