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4 Experimental program 43 Fig. 4.5-1 Flow rate of process streams during the PSA cycle The mean value of the fluctuating feed flow rate shown in Fig. 4.5-1 is calculated as an integral over the time. The assembled feed flow meter reveals 0.5 s of response time with a measurement accuracy of ± 0.6 %. Anyhow, the integrated value of the feed mass flow rate is always lower than the sum of product and equalised tail gas mass flow rates. In particular, the first seconds of the PSA half-cycle are not tracked fast enough by conventional flow meters. Consequently, the air demand determined by the explicit method is always slightly lower than determined by the implicit method, as shown in Tab. 4.5-1. Thus, it comes as no surprise that the relative error between explicit and implicit methods of the air demand determination does exceed the implemented 1 %-tolerance level. Tab. 4.5-1 Air demand of the reference process calculated according to different strategies Explicit method Air demand 3.09 ± [m3n/h air / m3n/h N2] 0.03 Implicit method Relative error δexp GMB OMB Explicit/ Implicit Implicit/ Implicit 3.17 ± 3.18 ± 0.01 0.01 2.75 % 0.32 % Fig. 4.5-2 Pressure in adsorbers during the PSA cycle To reduce the experimental error, the fluctuating tail gas is collected in a gas holder to be equalised over the time and then analysed on quantity and composition parallel to the continuingPDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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