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CO2 progress and issues on the control system

CO2 progress and issues on the control system. Lukasz Zwalinski – PH/DT 09.02.2009. Requirements for CO2 test stand. Requirements for test stand : 32 Analog Input s 4 Analog Output s 32 Digital Input s 32 Digital Output s SCADA system with long term logging.

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CO2 progress and issues on the control system

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  1. CO2progress and issues on the control system Lukasz Zwalinski – PH/DT 09.02.2009

  2. Requirements for CO2 test stand Requirements for test stand: • 32 Analog Inputs • 4 Analog Outputs • 32 Digital Inputs • 32 Digital Outputs • SCADA system with long term logging L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010

  3. Plant operation CO2PCO There will be one PCO with 3 option modes driven by allowance table Switch between modes is executed manually by the operator request. Start interlock: all requests are blocked when ON SI1 – NO Option Mode Selected Temporary Stop interlock: sends OFF request to the object when ON TS1 – NO 24V PS01 Status OK; [10s delay] Full Stop interlock: sends OFF request to the object & waits acknowledge when ON FS1 – NO Process Stop Button OK OR NO Process Stop OK; [2s delay] FS2 – HPC Pressure Switch Low =1 OR Pressure Switch High =1 [5s delay] FS3 – Pump Thermal Switch TSL1101 [5s delay] Configuration logic: FeedBackON = True IF CO2 PCO (Run Order & One of the option modes selected) FeedBackOFF = False IF NO CO2 PCO (Run Order & One of the option modes selected) L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010

  4. CO2PCO Safety position 0 Start up request Start up 1 T1 T0 Cool down request Cool down loop 2 T2 T0 Cool down accumulator request Cool down accumulator 3 T0 Plant operation In option mode Stand-By we can distinguish stepper with 4 steps associated Transition conditions: T0 = Not Run Order OR Not Option Mode Stand-by T1 = Run Order & Option Mode Stand-by & liquid circulation is achieved Pump ON &FT1901 > xx T2 = Run Order & Option Mode Stand-by & TT1110 – 30C < TTsat(calculated from PT1104) L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010

  5. Dynamically calculated f(Rth) 0 ÷ 100 % Analog Digital Object High limit PID Out High limit EH1104 PWM MV OutO 0÷100% SP Out Low limit Low limit 0% IF > 0 Then EH ON ELSE OFF IF < 0 Then CV ON ELSE OFF PT1103 Acc. Tsp Psat(Tsp) 0% Analog Object Out High limit High limit PID CV1104 MV PWM OutO 0÷100% SP Out Low limit Low limit Dynamically calculated f(sub-cool) 0 ÷ -100 % Accumulator Control L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010

  6. Accumulator Control Sub cooling: Thermal resistance: subcool = Tsat(PT1103) – TT1110 calculated every 5s L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010

  7. Interlocks L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010

  8. logic L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010

  9. 2 3 5 6 4 1 Enthalpy (kJ/kg) Enthalpy control Øm = Qexperimet / (h5 - h4) Qheater = (hrequested - h3) * Øm Tsat = B / [ln(P)-A]-C A = 10.77 B = -1956 C = 271.04 • It is not possible directly control the enthalpy in a PID loop. • The enthalpy must be derived from measured pressure and temperature and always be present in the • liquid phase which means that measured temperature should be at least 2C lower than calculated Tsat. • IF TT1103 -2C ≤ Tsat(PT1105) THEN enthalpy calculation ON • The enthalpy of point 3 can also be in the 2-phase area • The PLC is calculating enthalpy of a point 2 from measured temperature (TT1103) and pressure (PT1105). L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010

  10. UNICOS user interface L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010

  11. Software preparation UNICOS project creation:1 – Exel specyfication preparation 2 – PLC hardware configuration3 – PLC & PVSS instance generation4 – Process logic programation5 – Code compilation 6 – Loadingto PLC7 – Commisionig & operation Specyfication SCADA server Instance Generator SIEMENS PLC Logic Generator All generated files will be kept in Subversion Version Control (SVN) service. L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010

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