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Results from Prototype CO 2 Cooling Gas System

Results from Prototype CO 2 Cooling Gas System. Outline. Motivation Layout Component Start / Stop procedures and problems Conclusions. Motivation. Investigate pressure regulation on a small volume with extremely high flow

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Results from Prototype CO 2 Cooling Gas System

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  1. Results from PrototypeCO2 Cooling Gas System TRT Meeting 20/02/2002

  2. Outline • Motivation • Layout • Component • Start / Stop procedures and problems • Conclusions TRT Meeting 20/02/2002

  3. Motivation • Investigate pressure regulation on a small volume with extremely high flow • To establish Start / Stop procedures with the aim to stay <  2 mbar. • Main components functional tests. (valves, Turbines). • Simulate missing elements, like volumes, manifolds, lengths and diameters of pipes. TRT Meeting 20/02/2002

  4. Components • Turbine RIETSCHLE SKG 226 • Control valves 6.3 and 40 KVs • Flow meter DELTAFLOW. 100 m3 • Differential pressure flow meter p  4mbar @ 100 m3/h CO2 • Sensors 0/50 mbar, 0/-100 mbar, ± 10 mbar • Back-pressure regulator • Buffer Volume of  100 l was added (see T.D.R) • Two test volumes, 400 and 57 litres were tested. TRT Meeting 20/02/2002

  5. How to start up ? • Manual valve (by-pass) • Difficult to operate, bad stability • Frequency controller • Ramping the turbine between 80 to 100 steps to full power (25 min) • Resulted in smooth increase of flow with good regulation in the test volume • PID parameters • For booth regulation systems (PID1, PID2) were optimised • Back pressure regulator • With the back pressure regulator (BP1) the input pressure of the test volume was increased and with that the main flow through it. TRT Meeting 20/02/2002

  6. Starting up (Manual valve) TRT Meeting 20/02/2002

  7. Starting up (Frequency controller) TRT Meeting 20/02/2002

  8. Pressure and flow TRT Meeting 20/02/2002

  9. Buffer pressure p3 TRT Meeting 20/02/2002

  10. Shutting down procedure • No EV4, 5, 6. • Turn off pump resulted pressurising the test volume to > 10 mbar. • Close at same time EV5, 6 + open EV4 • Separate high pressure part from test volume and open valve 4 to exhaust, in order to equalise inside and outside pressure • Standard safety back-up. • Safest way to switch off resembles a power cut. • A slow ramp down of the flow resulted always in overpressures due to the high pressure in the buffer volume TRT Meeting 20/02/2002

  11. Shutting down procedure TRT Meeting 20/02/2002

  12. Conclusion • CO2 Cooling gas system will be very difficult to operate! • Buffer volume is absolutely needed for disentangling pressure control around the pump unit and around detector-wheels. • Pneumatic shut off separation valves (4, 5, 6) need to be fast (< 200 msec) in order to provide adequate detector safety. • Flow increase of about 20% should be possible by increasing the input pressure of the 6 wheels (without changing the setting of the wheels). • We feel, a second prototype with final component (as far as possible) is needed! TRT Meeting 20/02/2002

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