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

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

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.

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

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

MICE hydrogen system PID

MICE hydrogen system layout

MICE hydrogen system layout (2)

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

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.

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

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

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

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

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

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

Hydrogen Test Cryostat Outline 1120 Ø 580

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

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

Capacitance-based level sensors (2 or even 3) 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)

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

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

Status: Metal hydride tank Table 1 The specification of the MH tank for RAL   Hydrogen Storage Capacity 20 Nm3 Tank Description: Heat Transfer Medium Water MH Weight 155kg Tank Total Weight 220 Kg Operating Condition: Charging Gas Component Hydrogen of 99.99% purity Charging Gas Pressure 1.2 barA Hydrogen Charging Rate 70NL/min (up to 90% of Storage Capacity) Discharging Gas Pressure 1.2 barA Hydrogen Discharging Rate 70NL/min Utility Requirements: Cooling Medium Water Below -10℃ （At 20L/min） Heating Medium Above 20℃ （At 20L/min） Status: Waiting for a new quotation from the supplier

Hydrogen R&D: Layout

Hydrogen R&D: Phase I initial

Hydrogen R&D: Phase I initial (2)

Hydrogen R&D: Phase I final

Hydrogen R&D: Phase I final (2)

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