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Status of Hydrogen System DevelopmentStatus of Hydrogen System Development
MICE Collaboration Meeting, Frascati, June 26-29, 2005
Yury Ivanyushenkov, Tom Bradshaw, Elwyn Baynham, Mike Courthold, Matthew Hills, Tony Jones
Applied Science Division,Engineering and Instrumentation Department
RAL
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• Hydrogen system:
- principal points
- process and instrumentation diagram (PID)
- layout
• Hydrogen R&D:
- motivation and scope
- work packages
- components
- layout
• Plans
Scope
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• 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.
Conceptual points
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MICE hydrogen system layout: Principle
Hood
MICE
Cabinet for hydride bed and pipework
H2sensorArgon Jacketing
Safety area
1m3
• Argon jacketing of pipework is proposed in outside the hood. Basic philosophy is shown below:
5Pressuregauge
Non-return valve
P P VP Vacuum pumpBursting diskPressure relief valve
ValvePressureregulator
Pre-coolingOut In
Metal Hydride storage unit
(20m3 capacity)
Purge valve
0.5 bar
0.9 bar
H2 Detector
P
P
VP1
VP2
Purge valve
Chiller/Heater
Unit
1 bar
PP
0.5 bar
0.9 bar Helium supply
Hydrogen supply
High level vent
Buffer vessel
Vent outsideflame arrester
Extract hoodH2Detector
PP
Nitrogen supply
PP
PP
1 m3
Hydrogen zone 2
Vent manifold Vent manifold
P1
PV1
PV7
PV8
PV2
PV3
PV4
HV1
Fill valve
Tbed
HV2
HV3
P3
P
P2
PV6
High level vent
Non return valve
0.1 bar
MICE hydrogen system (familiar sketch)
Liquid level gauge
Internal Window
LH2 absorber
Safety windows
Vacuum
Vacuum vessel
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•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
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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 development: Scope (2)
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• WP1 Initial design -> Internal safety review
• WP2 Detailed design and procurement
• WP3 Installation and commissioning
• WP4 Test Programme
Hydrogen system R&D: Work packages
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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
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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 (2)
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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 R&D: WP1
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Tchill
Pressuregauge
Non-return valveP P VP Vacuum pumpBursting diskPressure
relief valveValvePressure
regulator
CoolantOut In
Test absorber assembly
Metal Hydride storage unit
(20m3 capacity)
Purge valve
0.5 bar
0.9 bar
H2 Detector
P
P
VP1
VP2
Purge valve
Chiller/Heater
Unit
1 bar
PP
0.5 bar
0.9 bar Helium supply
Hydrogen supply
High level vent
Buffer vessel
Vent outsideflame arrester
Extract hoodH2Detector
PP
Nitrogen supply
PP
PP
1 m3
Hydrogen zone 2
Vent manifold Vent manifold
P1
PV1
PV7
PV8
PV2
PV3
PV4
HV1
Fill valve
Tbed
HV2
HV3
P3
P
P2
PV6
High level vent
Non return valve
0.1 bar
Hydrogen system test rig
Mass spectrometer
M. F.M.
Mass flow meter
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Hydrogen test cryostat: Concept
T H
T H
• 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
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Hydrogen test cryostat
Condenser
LH2 dummy absorber
Level sensors
Cryocooler SRDK-4151.5 W @4.2K35/45 W @50K
Radiation shield
Hydrogen inlet and outlet
He inlet and outlet
Cu bottom plate with heat exchanger
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Hydrogen test cryostat (2)
Cu bottom plate with heat exchanger
Cartridge heaters
Finned top plateof condenser
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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)
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Control system
- Initial control sequence diagrams have been developed (example)
- Will be revised and completed
- Talking to ISIS and DL experts on hardware implementation
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Chiller onSet Tchill = Tchill_initial
Start PV1,2,3,4 closed
VP1 on, PV6 Open
Cooling system OnStart Pressure Control Loop
Start Vac MonitorOpen Pv1,Pv2
Tbed<Tbed1And
P3<1.e-5
P1Pset1
Close PV1,PV2Stop Pressure Control Loop
Set Tchill = Tchill_lowOpen PV3
Hlevel>Hlevel1
H2 System Ready
Increment/DecrementTchill
EmptySequence
P3<1.e-5
Vac monitor
Pressure Control
Yes
No
Yes
No Yes
No
Provisional Hydrogen System Control Sequence
Control logic – Fill Sequence
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(1600)φ216.3
140
(1810)
2-Rc3/4Relief valve
Filter
Valve
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
(up to 90% of Storage Capacity)
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