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10 Appendix 96 Flow coefficients Cv of particular valve models V representing controlled flow resistances in the PSA piping system were found individually by the fitting of simulated pressure curves to corresponding experimental pressure curves measured at the top of two adsorbers columns. In order to do so, controlled flow resistances in a specific pipeline were investigated one at a time; therefore, control valves in all other pipelines were fully opened and all other valve models V in the process simulator representing controlled flow resistances were adjusted to simulate the action of the ball valve, accordingly. The results of individually adjusted controlled flow resistances in the PSA piping system are presented in Fig. A.6-1. Fig. A.6-1 Experimental and simulated adsorbers pressure profiles at individually adjusted Cv values simulating controlled flow resistances in the PSA piping system: (a) feed pipeline Cv = 5.0 Cv = 2.5 Fig. A.6-1 Flow coefficients Cv simulating controlled flow resistances in the PSA piping system × 10-1 for V2 and V3; (b) equalisation pipelines × 10-5 for V10 and V11; (c) tail gas pipeline – V6 and V7 simulating action of ball valve (minimised flow resistances) 5.0 × 10-4 25 5.0 × 10-3 Feed pipeline 6 5.0 × 10-1 53* 25* 2.5 × 10-5 Equalisation pipeline * Favourable stem position Stem opening of valve [%] 15 35 5 50 15 53 Cv [kmol/s/bar] 1.0 × 10-3 1.5 × 10-2 1.1 × 10-5 3.0 × 10-5 1.5 × 10-5 9.0 × 10-5 75 7.4 × 10-5 25 3.0 × 10-5 Tail gas pipelinePDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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