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5 Validation of the mathematical model 61 reason, the optimum position of stems was found at 25 % opening, as presented in Fig. 5.3.1- 1c. When adjusting equalisation control valves to the favourable stem position, the productivity increases by 18.22 % and the air demand decreases by 8.60 % in relation to the process with minimised controlled flow resistances in the PSA piping system. The pressure measured at the top of the adsorber columns after pressure equalisation is presented in Fig. 5.3.1-2. The diagram shows that a remaining pressure difference of about 1.36 bar between the columns after equalisation results in the optimal PSA performance in this plant. Fig. 5.3.1-1 Experimental PSA performance at various controlled flow resistances in the piping system at reference process conditions at product purity level of 1000 ppm O2: (a) feed pipeline, (b) tail-gas pipeline, (c) equalisation pipelines Fig. 5.3.1-2 Pressure in the adsorber columns after pressure equalisation at different stem positions of the equalisation valves (Top/Top + Bottom/Bottom) at reference process conditions at product purity level of 1000 ppm O2 Control valves in all investigated pipelines were adjusted according to their individual, favourable stem opening. PSA performance indicators were determined and compared to those of the process with minimised controlled flow resistances in the PSA piping system at two product purity levels. The results are presented in Tab. 5.3.1-2. Optimisation of controlled flow resistances, performed by setting the stem position of the discussed control valves to their individually-established favourable position, enhanced the PSA performance regardless the product purity level; however, the effect becomes more significant as the product purity increases. In spite of that, to demonstrate the overall optimum of PSA performance indicatorsPDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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