Ch. 2: Dynamics: Tower Diameter

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Presentation transcript:

Ch. 2: Dynamics: Tower Diameter Units F Eng 1.0 ft/s & lb/ft3 SI 1.22 m/s & kg/m3 Check steady state simulation for Qmax & v

Column Hydraulics ASPENPLUS: Radfrac block Report  include hydraulic parameters Run simulation Results Radfrac Block Profiles Hydraulics tab 

In-Class Exercise P = 2 bar sat’d liq 20 stages Feed = above stage 10 D = 11.8 kmol/hr RR = 1.5 Benzene 11.8 kmol/hr Toluene 11.8 kmol/hr

In-Class Exercise

In-Class Exercise AspenPlus Tray sizing

Chapter 3: Controller Tuning Type Kc (gain) I (reset time) F (filter) Flow 0.5 0.3 min 0.1 min Level (surge) 2   (reactor) 10 (others) See text Pressure

Chapter 3: Controller Tuning F, P, L - are simple controllers Temperature & Composition More difficult Why ? A: lags or deadtime Simulators respond instantaneously To make more realistic Add lag time in control loop Table 3.1 Typical values Rest of Chapter 3: Tuning techniques

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