Hydrogen Delivery System – R&D Activities
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Transcript of Hydrogen Delivery System – R&D Activities
Hydrogen Delivery System – R&D Activities
T W BradshawM CourtholdM HillsJ RochfordDaresbury Controls Group etc…
AS Scientific status
Buffer Volume:Complete and radiographed, awaiting certification
Buffer volume pipework
AS Scientific statusCryostat:50% complete overall
Cryostat:Condenser and condensing pot complete
AS Scientific status
AS Scientific status
Absorber base plate
AS Scientific status
Gas panel:Layouts agreed; fabrication not yet started
Relief valves decided.
Delivery of relief valves on critical path.
Transfer Line: Complete
Hull coolingWater/Glycol Inlet, 1”
Hull coolingWater/Glycol Outlet, 1”
Dia 470
1590
Hydrogen connection with shut-off valve and safety valve
Internal coolingWater/Glycol Inlet/Outlet
Top removable thermal insulation cover
1680
Nominal capacity: 2450 g (27 Nm3) H2
Volume of overall storage tank: 250 litresOverall weight: 375 kg
Metal Hydride Storage Tank
Ventilation & Vacuum Systems
MICE Hall South Wall
Hydrogen Extraction Vents
Proposed Area for Vacuum Pump Enclosure
Conduits for vacuum lines installed during August shutdown
Hall Installation
Ventilation Ducts
Enclosure(containing Gas Panel, Hydride Bed and Buffer Tank)
Heater/Chiller Units for Hydride Bed
Transfer Line
Test Cryostat
Plans & Schedule
•Ongoing issues with commissioning the Decay Solenoid and Linde refrigerator have taken effort off this project (MJDC, JHR, MJH)
•H2 R&D team at RAL still chronically short-staffed, having lost two key team members earlier this year; although Alan Ruddell joined team in May (25% effort). Still no technician effort available.
•Ian Mullacrane (DL) taken over from Graham Charnley, and coordinating DL effort re controls & instrumentation. The work will need to comply with IEC 62508/61511 (Functional Safety), and Safety Integrity Level (SIL) of H2 R&D system will need to be assessed & implemented. Progress is good in this area, thanks to DL team. Some discussion between DL & RAL teams currently re appropriate level of compliance.
•Key members of RAL & DL teams will be trained in December in SIL assessment according to IEC 61508/61511, although consultants still required to ensure system complies with IEC 61508/61511.
•Work on cryostat build at AS Scientific currently very slow (still 50% complete). Work on gas panel not yet stated, although final decision on choice of safety relief valves and LH2 level detectors has now been taken.
Plans & Schedule
•Design of H2 ventilation system and external pump housing well advanced. Mound excavation complete.
•Hydrogen System Control Room has been assigned.
•As much control & instrumentation hardware will be purchased as possible by December, including pumping systems.
•H2 system purging pump, along with backing-pump for cryostat pumping rig, will be housed outside MICE Hall.
•Exact location of turbo-pump for the R&D cryostat pumping rig still to be decided. It needs to be located outside magnetic shielding wall, but its location might differ from that of final system, and it is important not to cut more holes in shielding wall than absolutely necessary.
•Initial tests will be conducted with Helium in Cryogenics Laboratory, to avoid interference with installation of ventilation system
Plans & Schedule
•Schedule has been revised:
•It is anticipated that the ventilation system in the hall will be installed by the end of December.
•It is planned to submit H2 R&D commissioning plan to ISIS/MICE Safety Committee in November.
•HAZOP 2 review will be held as soon as practical in the near future, hopefully Nov/Dec.
•Final Safety Review will follow as soon as possible after HAZOP 2.
Testing
Helium TestsCheck instrumentationPump and purgeCheck relief valve settings and operationCheck cryocooler operation at LH2 and LHe temperaturesLiquify helium in the cryostatTest emptying sequenceThermally cycle the system, to check for leaks from thermal stresses
Hydrogen TestsCheck alarms and interlocksLiquify hydrogen in the cryostatCheck empty and purge sequenceTest effect of using Helium top-up gas to maintain positive pressureMeasure H2 desorption rateMeasure H2 absorption rate
Hydrogen R&D System
TestCryostat
Gas Panel
VacuumSystem
Exhaust
Heater Chiller
Hydride Bed
Storage
Buffer Volume Hydrogen
DeliveryControlSystem
MICE ControlSystem
Extraction Hood / Cabinet
Safety Relief
TestCryostat
Gas Panel
VacuumSystem
Exhaust
Heater Chiller
Hydride Bed
Storage
Buffer Volume Hydrogen
DeliveryControlSystem
MICE ControlSystem
Extraction Hood / Cabinet
Safety Relief
Hydrogen System P&ID
Cryostat
BottleStore
Gas Panel
Venting
Vac. Pumps
Heater/ChillerUnit
HydrogenBottle
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Cryostat
Cryocoolerand Compressor
Level Sensors
Nitrogen Jacketingon Pipes
Electrical heating ofbase-plate Pre-cooling loops
Pressure Transducers
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Electrical heater for operation of cryocooler with H2
Temperature sensors
Temperature sensors on base-plate
Gas Panel and Hood
Hydride BedBuffer Volume
Extraction Hood
Absorber ReliefValves
Cryostat Relief Valves
Fill/Purge ValvesH
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Fill/Purge Valves
• Pneumatically actuated valves• Arrow indicates position on failure
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Vacuum System
2 Elements
• Purging Pump for H2 system
• Cryostat Vacuum system
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Venting
• Hydrogen detectors in extraction hood, vent line and vacuum exhaust
• 2 fans provide redundancy in venting from hood• Flame arrestors used throughout• Helium flow in vent line to dilute leaks
Whessoe – Varec Flame Arrestor
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Hydrogen R&D System Layout Hydrogen R&D System Test Cryostat
Control Valves
• Ball Valves– Pneumatically actuated
– Spring Return Actuators ensure valve returns to default position on failure
• Control Valves– Pneumatically Actuated
– Large range on throttling
– Suitable for use with hydrogen
Relief Valves & Bursting Discs
• Seetru AD2000:A2 / TDR 421 for gas– Media Hydrogen gas– Temperature – minus 80 Deg
C– Flow rate – 1000 Ltrs/sec– Set pressure 0.5 BarG– Valve fully open at 0.6 BarG– Reseat at 0.3 BarG– Atex approved
• BS&B Low Pressure Reverse Buckling Disc– ±10% tolerance on burst
pressure– Vacuum/back pressure
resistant– Designed to rupture without
fragmentation• Appropriate certification to be
obtained for all valves
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Instrumentation
• Temperature Sensors– Platinum Resistance
• Fast response time (<0.5s)– Cernox for cooler cold head temp.
• Level Sensors– AMI Capacitance Level Transmitter– Useable with Hydrogen– Problem with obtaining ATEX certification– No solution
• Ametek Drexilbro, Endress & Hauser, Impress, Omega, Synatel
• Pressure and Vacuum Gauges– Leybold can supply capacitance vacuum
gauges, which are safe for use with hydrogen.
– Explosion proof pressure transducers available from Honeywell
– ATEX approved pressure transducers also available from SensorsOne
Level SensorsPressure Transducers
Temperature sensors
Vacuum System Pumps
• Proposal received from Leybold based on combination of rotary vane and turbo-molecular pumps
– TRIVAC D40B for hydrogen system purging pump (VP1)
– Special Pumpset with active control suggested for cryostat vacuum (VP2)
• D25BCS backing pump
• Turbo-molecular TMP151C to achieve high vacuum (10-3 mbar)
• Both pumps can be operated with purge gas (e.g. He) if pressure rises (indicating a leak)
TRIVAC D40B
TMP151C
TRIVACD25BCS
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