Mô phỏng công nghệ hóa học và dầu khí - Dynamic modeling using unisim design - Unit 3 Transitioning from steady state to dynamics

Nhóm Mô phỏng Công nghệ Hoá học và Dầu khí Trường Đại học Bách khoa Hà Nội Dynamic Modeling using UniSim Design Unit 3 Transitioning from Steady State to Dynamics Objectives  Equipment Sizing  Define Pressure Flow Specification  Add Strip Chart and Controllers  Run a Simple DynamicSimulation and Observe the Role of various Controllers 2 UniSim Design Dynamics  Design tab: basic design parameters 3 UniSim Design Dynamics  Rating tab: detail information 4 default values estimated Transitioning from SS to Dyn Starting with case 01.SS.usc 1. Adding Unit Operations 2. Equipment Sizing 3. Adjusting Column Pressure 4. Logical Operations 5. Adding Control Operations 6. Entering the UniSim Design Dynamic environment 7. Adding Pressure-Flow Specification 8. Troubleshooting 5 Add Unit Operations  Unit operations without a P-F relation:  Vessels  Mixer  Tees  Tray sections  To define a P-F relation to these streams:  Add Valves  Add Heat Exchagers  Add Pumps 6 Sizing the Valves UniSim Design automates Valves sizing based on:  Valves operating characteristics (linear, quick opening, equal percentage, or a user defined user table for the valves)  Normal valve opening position  Pressure drop across the valves  Current mass or mole flow rate  Feed density 7 Sizing the Valves  Double-click on the control valve VLV-100  Rating tab: select Universal Gas Sizing from the Valve Manufacturers  Rating tab: set the Valve Operating Characteristics to Linear  Set the Valve Opening: 50%  Click the Size Valve to complete the sizing:  Cv = 109.4 USGPM  Flow Rate 2.440e+5 kg/h (open 50%)  Delta P = 3790 kPa 8 Sizing the Valves 9 Sizing the Separator 10 Rating tab: Vessel Volume of 127 m³ Sizing the Cooler 11 Dynamics tab: Volume 15 m³ Save as 03.UO.usc  Making Pressure-Flow and Dynamic Specifications 12 Analysis of the Process Flowsheet  The boundary streams:  Alpha  Bravo  Charlie  Hot Vap is conented to E-100  HP Liq1 is connected to VLV-100  Alpha, Bravo, Charlie are connected to MIX- 100 → add Valves  Mixer: Equalize All 13 Analysis of the Process Flowsheet 1. Disconnect streams Alpha, Bravo and Charlie from the Mixer 2. Change the pressure of  Alpha to 7930 kPa (1150 psia)  Bravo to 7590 kPa (1100 psia)  Charlie to 8270 kPa (1200 psia) 3. Add valves to streams Alpha, Bravo, Charlie with valve product streams name Alpha1, Bravo1 and Chalie1 14 Analysis of the Process Flowsheet 4. Connect the three valve product streams to MIX-100 5. Set the pressure of stream ToSep to 6480 kPa (940 psia) 6. Mixer: Equalize all 7. Rating tab of each valve:  select Universal Gas Sizing from the Valve Manufacturers  select Linear under Valve Operating Characteristics 8. Size valves VLV-101, VLV-102, VLV-103 15 Make Changers to Flowsheet 16 Make Changers to Flowsheet 17 Make Changers to Flowsheet 18 Size the Valve VLV-101 19 Size the Valve VLV-102 20 Size the Valve VLV-103 21 Make the Pressure-Flow Specs 1. Dynamics tab (Alpha, Bravo, Charlie, Hot Vp, HP Liq1): activate the Pressure specification 2. Dynamics tab Specs page for the cooler E-100: press the Calculate k button (checked Overall k) 3. All valves: check Pressure-Flow Relation Save case as 03.Specs.usc 22 Activate the Pressure Spec 23 Dynamic tab of Cooler 24 Controllers  Connections for PV Source and Output Target Object  Minimum and Maximum values for PV  Controller directly connected to Stream (Material or Energy): size Control Valve  Select Controller Action: Reverse or Direct  Controller Tuning Parameters  Mode of Controller: Off, Manual or Auto 25 Control Strategy 1. FC for Alpha, Bravo, Charlie 2. LC to HP Sep vessel 3. TC for the Hot Vap stream 4. Cascade Control PC-HP sep 26 FC-Alpha Connections Name FC-Alpha Process Variable Source Alpha Mass Flow Output Target Object VLV-101 Actuator Desired Position Parameters Action Reverse PV Minimum 0 kg/h PV Maximum 365000 kg/h Mode Man(ual) OP 50% Kc 0.25 Ti 0.10 min Td 27 FC-Alpha 28 FC-Alpha 29 FC-Alpha 30 FC-Bravo Connections Name FC-Bravo Process Variable Source Bravo Mass Flow Output Target Object VLV-102 Actuator Desired Position Parameters Action Reverse PV Minimum 0 kg/h PV Maximum 365000 kg/h Mode Man(ual) OP 50% Kc 0.25 Ti 0.10 min Td 31 FC-Charlie Connections Name FC-Charlie Process Variable Source Charlie Mass Flow Output Target Object VLV-103 Actuator Desired Position Parameters Action Reverse PV Minimum 0 kg/h PV Maximum 365000 kg/h Mode Man(ual) OP 50% Kc 0.25 Ti 0.10 min Td 32 LC-HP Sep Connections Name LC-HP Sep Process Variable Source HP Sep Liquid Percent Level Output Target Object VLV-100 Actuator Desired Position Parameters Action Direct PV Minimum 0% PV Maximum 100% Mode Man(ual) OP 50% Kc 1.0 Ti 15.0 min Td 33 TC-Hot Vap Connections Name TC-Hot Vap Process Variable Source Hot Vap Temperature Output Target Object qE-100 Control Valve Control Valve Duty Source Direct Q Min. Available 0 kJ/h Max. Available 1.06E8 kJ/h 34 TC-Hot Vap Parameters Action Direct PV Minimum 10oC PV Maximum 65oC Mode Man(ual) OP 50% Kc 1.0 Ti 2.0 min Td 35 TC-Hot Vap 36 TC-Hot Vap 37 TC-Hot Vap 38 TC-Hot Vap 39 Cascade Control PC-HP Sep Connections Name PC-HP Sep Process Variable Source HP Vap Pressure Output Target Object FC-Alpha Controler SP Parameters Action Reverse PV Minimum 5500 kPa PV Maximum 6900 kPa Mode Man(ual) OP 35% Kc 3.0 Ti 2.0 min Td 40 Cascade Control PC-HP Sep 41 Cascade Control PC-HP Sep 42 Cascade Control PC-HP Sep 43 Cascade Control PC-HP Sep 44 PFD 45 Controller with Face Plate 46 Strip Charts Flow 1. Tools → Databook 2. Variables tab and add the Variables:  Alpha1 massflow  Bravo1 massflow  Charle1 massflow  Hot Vap Liq1 massflow 4. Strip Charts tab 5. Name: Flow 47 Strip Charts Flow 48 Strip Charts Flow 49 Strip Charts HP Separator  Variables tab and add the Variables:  HP Vap: pressure  HP Sep: liquid percent level  Hot Vap : temperature  Setup All...  Logger Size: 3600 points  Sample Interval: 60 sec  Save case as 03.Dyn0.usc 50 Strip Charts HP Separator 51 Run Dynamic Mod 52 Save case as 03.Dyn1.usc Controler: change the mode to Auto(matic) Strip Charts Flow 53 Strip Charts HP Separator 54