Status of Hydrogen System Development

1. Status of Hydrogen System Development Yury Ivanyushenkov, Tom Bradshaw, Elwyn Baynham, Mike Courthold, Matthew Hills, Tony Jones Applied Science Division, Engineering and Instrumentation Department RAL MICE Collaboration Meeting, Frascati, June 26-29, 2005

2. Scope • Hydrogen system: • - principal points • - process and instrumentation diagram (PID) • - layout • Hydrogen R&D: • - motivation and scope • - work packages • - components • - layout • Plans

3. Conceptual points • Individual hydrogen system for each of 3 absorbers. • Use of a metal hydride bed for hydrogen storage. • Compact location of the components under hydrogen extraction hood • close to the absorber.

4. MICE hydrogen system layout: Principle • Argon jacketing of pipework is proposed in outside the hood. Basic philosophy is shown below: H2sensor Hood Argon Jacketing 1m3 Cabinet for hydride bed and pipework MICE Safety area

5. H2 Detector H2Detector MICE hydrogen system (familiar sketch) High level vent High level vent Vent outside flame arrester Non return valve Vent manifold Vent manifold 0.1 bar Hydrogen zone 2 Extract hood VP2 PV8 P1 P Metal Hydride storage unit (20m3 capacity) P PV7 P PV2 PV1 Chiller/Heater Unit 1 bar Tbed Buffer vessel Hydrogen supply PV3 1 m3 PV4 P Fill valve P HV1 Pre-cooling Out In P2 P 0.5 bar Liquid level gauge 0.9 bar P3 HV2 Internal Window P P Purge valve P P P LH2 absorber Safety windows Vacuum Purge valve HV3 Vacuum vessel 0.9 bar Nitrogen supply PV6 Helium supply 0.5 bar VP1 Pressure gauge Pressure relief valve Non-return valve Pressure regulator Bursting disk Valve P P Vacuum pump VP

6. MICE hydrogen system PID

7. MICE hydrogen system layout

8. MICE hydrogen system layout (2)

9. Hydrogen system development: Scope • To construct a prototype hydrogen handling system at RAL which will become the first full system of MICE • This will consist of 2 main parts • The external system – which will be in the final form • to deliver H2 to the absorber and store the H2 in the hydride beds • The safety system to vent H2 in failure modes- to include relief valves and buffer volume • The dummy absorber • The absorber will be simulated by a simple cryostat with a containment vessel to contain 20 litres of H2 – operated from a condensing pot with a cryocooler

10. Hydrogen system development: Scope (2) • The development programme will address the following issues: • Confirm the working parameters of a hydride bed in the regimes of storage, absorption and desorption of hydrogen ? • Purity of hydrogen and effects of impurities. • Hydride bed heating/ cooling power requirements. • Instrumentation and control required for the operation of the system • Safety aspects including - safety relief valves, sensors and interlocks and safety documentation • The R&D programme will enable the final design for the MICE hydrogen system to be confirmed and the HAZOP to be completed.

11. Hydrogen system R&D: Work packages • WP1 Initial design -> Internal safety review • WP2 Detailed design and procurement • WP3 Installation and commissioning • WP4 Test Programme

12. Hydrogen system R&D: WP1 • Initial Design • H2 handling system • Confirmation of • components on H2 circuit diagram • pipe sizes, mass flows, pressure drops, relief valve specifications, venting, manifolding • vacuum and purging systems • layouts in hall • H2 zones • basic specifications for purchased items

13. Hydrogen system R&D: WP1 (2) • Initial Design • Dummy absorber • Cryostat design • H2 containment vessel, condensing pot, internal pipework components • Pre - cooling – heat exchanger etc • Heater for load simulation and H2 boil off • Instrumentation • Data acquisition • Outline definition of test programme and proposals for fault condition simulation

14. Hydrogen system R&D: WP1 • Conclusion of WP1 • Update cost estimates for main components • Internal Engineering and Safety Review • - Aim will be confirm the scope of the R&D programme and release the stage of WP2 – detailed design and procurement

15. Hydrogen system test rig High level vent High level vent Vent outside flame arrester Non return valve Vent manifold Vent manifold 0.1 bar Hydrogen zone 2 Extract hood VP2 PV8 P1 P Metal Hydride storage unit (20m3 capacity) P PV7 P Mass spectrometer M. F.M. PV2 PV1 Chiller/Heater Unit 1 bar Mass flow meter Tbed Buffer vessel Hydrogen supply PV3 1 m3 PV4 P Fill valve P HV1 Coolant Out In P2 P 0.5 bar 0.9 bar P3 HV2 P P Purge valve P P P H2 Detector H2Detector Test absorber assembly Purge valve HV3 0.9 bar Nitrogen supply PV6 Helium supply 0.5 bar VP1 Non-return valve Pressure gauge Pressure relief valve Pressure regulator Bursting disk Valve P P Vacuum pump VP Tchill

16. Hydrogen test cryostat: Concept • Instrumentation mimics what we will need on the absorber for the control system and interlocks • Heater will regulate temperature of cryocooler – need redundancy and interlock with compressor • Dia.Reservoir =height=290mm T H T H

17. Ø 580 1120 Hydrogen Test Cryostat Outline

18. Hydrogen inlet and outlet Cryocooler SRDK-415 1.5 W @4.2K 35/45 W @50K He inlet and outlet Radiation shield Condenser Level sensors LH2 dummy absorber Cu bottom plate with heat exchanger Hydrogen test cryostat

19. Finned top plate of condenser Cu bottom plate with heat exchanger Cartridge heaters Hydrogen test cryostat (2)

20. Instrumentation • Capacitance-based level sensors (2 or even 3) • (communicating with a supplier concerning choice of a sensor) • Temperature sensors (PRTs) • (standard components of any cryogenic system) • Cartridge heaters • (standard components)

21. Control system • Initial control sequence diagrams have been developed • (example) • Will be revised and completed • Talking to ISIS and DL experts on hardware implementation

22. Chiller on Set Tchill = Tchill_initial Start PV1,2,3,4 closed VP1 on, PV6 Open Hlevel>Hlevel1 Increment/Decrement Tchill No P1Pset1 No Yes Tbed<Tbed1 And P3<1.e-5 Pressure Control Close PV1,PV2 Stop Pressure Control Loop Set Tchill = Tchill_low Open PV3 Yes Cooling system On Start Pressure Control Loop Start Vac Monitor Open Pv1,Pv2 Vac monitor P3<1.e-5 H2 System Ready No Empty Sequence Yes Provisional Hydrogen System Control Sequence Control logic – Fill Sequence

23. Metal hydride tank Table 1 The specification of the MH tank for RAL Hydrogen Storage Capacity20 Nm3 Tank Description: Heat Transfer MediumWater MH Weight 155kg Tank Total Weight220 Kg Operating Condition: Charging Gas ComponentHydrogen of 99.99% purity Charging Gas Pressure1.2 barA Hydrogen Charging Rate70NL/min (up to 90% of Storage Capacity) Discharging Gas Pressure1.2 barA Hydrogen Discharging Rate70NL/min (up to 90% of Storage Capacity) Utility Requirements: Cooling MediumWater Below -10℃ （At 20L/min） Heating MediumAbove 20℃ （At 20L/min） • Status: • Waiting for a new quotation from the supplier

24. Hydrogen R&D: Layout

25. Hydrogen R&D: Phase I initial

26. Hydrogen R&D: Phase I initial (2)

27. Hydrogen R&D: Phase I final

28. Hydrogen R&D: Phase I final (2)

29. Hydrogen system R&D – Schedule • Outline Schedule • WP1 Initial design: May – August 05 • with Review in September 05 • WP2 Detailed design and procurement: Aug 05 – Feb 06 • WP3 Installation and commissioning: Jan – April 06 • WP4 Test Programme: June – Oct 06