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Ch. 2: Dynamics: Tower Diameter

Units. F. Units. Eng. 1.0. ft/s & lb/ft 3. SI. 1.22. m/s & kg/m 3. Ch. 2: Dynamics: Tower Diameter. Check steady state simulation for Q max &  v. Column Hydraulics. Radfrac block Report  include hydraulic parameters Run simulation Results Radfrac Block Profiles

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Ch. 2: Dynamics: Tower Diameter

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

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

  3. 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

  4. In-Class Exercise

  5. In-Class Exercise AspenPlus Tray sizing

  6. Controller 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 2 10 Chapter 3: Controller Tuning

  7. 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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