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MICE Hydrogen System

MICE Hydrogen System. Tom Bradshaw Yury Ivanyushenkov Elwyn Baynham Meeting October 2004 – Coseners House. H. Detector. 2. H. Detector. 2. Baseline layout. High level vent. High level vent. High level vent. High level vent. Vent. Vent. outside. outside. Non return. Non return.

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MICE Hydrogen System

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  1. MICE Hydrogen System Tom Bradshaw Yury Ivanyushenkov Elwyn Baynham Meeting October 2004 – Coseners House

  2. H Detector 2 H Detector 2 Baseline layout High level vent High level vent High level vent High level vent Vent Vent outside outside Non return Non return flame flame valve valve Vent manifold Vent manifold Vent manifold Vent manifold arrester arrester 0.1 bar 0.1 bar H H Detector Detector Hydrogen zone 2 Hydrogen zone 2 2 2 Extract hood Extract hood VP2 VP2 PV8 PV8 P1 P1 P P Metal Hydride Metal Hydride P P PV7 PV7 storage unit storage unit P P (20m (20m capacity) capacity) 3 3 PV2 PV2 PV1 PV1 Chiller Chiller /He /He 1 bar 1 bar ater Unit ater Unit Tbed Tbed Buffer Buffer Hydrogen Hydrogen PV3 PV3 1 m 1 m 3 3 vessel vessel supply supply PV4 PV4 P P Fill valve Fill valve P P HV1 HV1 Coolant Coolant Out In Out In P2 P2 P P 0.5 bar 0.5 bar 0.9 bar 0.9 bar P3 P3 HV2 HV2 P P P P Purge valve Purge valve P P P P P P H H Detector Detector 2 2 Safety window Purge valve Purge valve HV3 HV3 Absorber window 0.9 bar 0.9 bar PV6 PV6 Nitrogen Nitrogen Helium Helium supply supply supply supply 0.5 bar 0.5 bar VP1 VP1 - - Pressure Pressure Non-return valve Pressure gauge Pressure regulator Pressure Bursting disk Bursting disk Valve Valve P P P P VP VP Vacuum pump Vacuum pump relief valve relief valve

  3. Hydride bed • Tanks need to be horizontal • Air ingress reduces capacity and oxidises material – oxidation rate is low. • Alloy will become flammable after activation but it needs an ignition source. Checked that there are no safety issues if there is a catastrophic ingress of air. • Activation procedure: • Pump out absorber • Heat to 60-80C • Add H2 to about 1.2 bar • Leave to soak for 8 hours

  4. Black lines absorbtion Dotted lines desorbtion Hydride Bed Hydride Characteristics 20l liquid = 16,000 normal litres gas – will absorb this in under 4 hours

  5. Specification for the Hydride Bed 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） Design CodeAD Merkblaetter CertificationDeclaration of Conformity to Pressure Equipment Directive 97/23/EC Certified by a Notified Body） Hydrogen Storage Capacity20 Nm3 Tank number/system1 Tank Description: Heat Transfer MediumWater MH Weight 155kg Tank StructureShell & Tube type Dimensions φ216.3×L1600（mm） ( not include attachments ) Tank Total Weight220 Kg

  6. Expected boil-off rate Latent heat 446000 J/kg Power into liquid 10179 W Hydrogen boiled off (kg/s) 0.022823 kg/s Start mass of liquid 1.544 kg Liquid density 70.288 Start pressure (bar) 0.5 Rgas 4157 dt 0.2 Buffer vol 1 m^3 density 300K 0.08 kg/m^3 relief valve pressure 1.60E+05 Pa outlet mass flow 1.20E-02 kg/s Effectiveness of Buffer Volume • Assumes mixing of gas - cold from absorber + buffer volume • Temp in buffer calc on basis of constant Cv - this is optimistic for Tgas ~50K but pretty good for Tgas >100K • For large outflow through relief valve the algorithm is not correct because the valve essentially shuts • Buffer volume gives a huge safety margin over just the pipe system with vol ~ 0.1m^3 for 50m of 50mm dia pipe • The buffer vessel will keep the gas warmer due to its thermal mass - this is not included - it will increase the pressure rise • Typically with 1m^3 Tgas ~100K pressure rise rate is 0.1 bar/sec valve opening time of 0.1-0.2 sec would be OK

  7. Pressure relief valves • Tyco (Crosby) valves – key points: • Pilot valves – quick acting • 3% tolerance on set pressure • Closes at 95% of set pressure • Response time is <0.5s • Valves re-seat on elastomers • 91&94 valves usable to 20K (although situated at RT) They also manufacture bursting discs and flame arrestors Feel confident that we have a solution for this.

  8. R&D Process Issue of the test area is still not finalised – is it sensible to test while other work is going on ? May have to make a safety case or find somewhere else. • Next steps are to design layouts in the hall, pipework – test area • Installation of venting system • Design and order cryostat and cryocooler • Order hydride bed • Pressure relief valves • Control system Main issue is what will the funding profile allow ?…… We will be using a cryocooler and perform tests on the control system,condensation rate etc…

  9. Safety Review Process

  10. END SourceD:\MICE\Cryogenics\HydrogenSystem\[Pressure rise buffer.xls]press buffer-2

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