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2.4. VSA separation performance, Paper D 17 was changed to 600 ppm NO2 in Ar with a flow rate of 2600 cm3 min−1 (STP). The concentration of NO and NO2 in the reactor effluent was measured continuously by a chemiluminescence detector (Ecophysic CLD 700 EL ht). After adsorption, the reactor was flushed with pure Ar for 4 minutes. Figure 2.3: Scheme of the reactor used for NOx adsorption experiments. 2.4 VSA separation performance, Paper D The VSA separation performance was simulated for the structured NaX adsorbents and NaX beads. A three-step (adsorption - desorption - repressurization) VSA cycle was considered, see Figure 2.4. Simulations were performed for a system with a single column loaded with beads or structured zeolite adsorbents using the MINSA (Monash Integrator for Numerical Solution of Adsorption) software. The simulator is based on mass and energy balances, and incorporates features to simulate pressure drop across adsorbent beds, and switching and control valves which accurately reflect the experimental VSA system [49]. In the first step, feed gas containing 10 % CO2 in N2 at different flow rates (0.2, 0.5 and 1 litre/minute) at 300.85 K and 1.2 bar pressure enters the bottom of the bed. This step ends when CO2 starts to break through. In the second step, the bed is evacuated counter-currently. This step ends when the bed pressure reaches 0.02 bar pressure. In the third step, N2 is used to re-pressurize the bed to feed pressure in a countercurrent direction. These simulations were performed to explore the behaviour of the different adsorbent structures in particular to judge the merits of structured adsorbents at short cycle times. It is worth noting that the three step cycle tested here is not a typical cycle which would be used in an industrial CO2 capture plant [50]. However, the major steps of adsorption and desorption (regeneration) are captured and it is these features which are important in demonstrating the impact on the performance of the adsorbent. The effect of adsorbent structure was evaluated in terms of product purity, productPDF Image | Structured Zeolite Adsorbents for PSA Applications
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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