The MICE Hydrogen System Summary Tom Bradshaw, Yury Ivanyushenkov, Elwyn Baynham, Tony Jones, Mike...
-
Upload
elwin-scott -
Category
Documents
-
view
225 -
download
1
Transcript of The MICE Hydrogen System Summary Tom Bradshaw, Yury Ivanyushenkov, Elwyn Baynham, Tony Jones, Mike...
The MICE Hydrogen System Summary
Tom Bradshaw, Yury Ivanyushenkov, Elwyn Baynham, Tony Jones, Mike Courthold and Matthew Hills
Rutherford Appleton Laboratory
There are two phases to the implementation of the hydrogen delivery system:
•R&D Phase where a single system is developed and tested on a test cryostat which represents an absorber.
•Implementation phase where the delivery system is matched to a real MICE absorber
The objective of the R&D phase is to demonstrate a safe hydrogen delivery system for the absorber.
This will consist of a first model MICE hydrogen delivery system together with a test cryostat that does not have thin windows but does contain the same instrumentation.
Objectives of R&D
System Overview
•Gas Delivery System
•Hydride bed for gas storage
•Control Valves, pumps, alarms and indicators
•Buffer volume
•Control System
•Controllers
•Interface to the rest of MICE
•Test Cryostat
•Cryocooler
•Instrumentation
•Hydrogen volume
Test Cryostat
Gas Panel
Vacuum System
Exhaust
Heater Chiller
Hydride Bed
Storage
Buffer Volume
Hydrogen Delivery Control System
MICE Control System
Extraction Hood
Safety Relief
Safety Review Contents
1. MICE Overview (Mike Zisman)
2. Introduction (Tom Bradshaw)
3. Process and Instrumentation Diagrams (Matthew Hills)
4. Control System (Mike Courthold)
5. Hall Infrastructure and R&D Cryostat (Tony Jones)
6. HAZOP and failure analysis (Yury Ivanyushenkov)
7. Summary (Tom Bradshaw)
First walk through was held on the 21st October – review items were collected and will be dealt with
Need to produce the terms of reference for the review
Need to produce a test plan
Current Activities
Main activities are:
•The safety review
•R&D system is being detailed
•Process and instrumentation diagram has been revised
•Control system algorithms being developed
Cryostat
HeliumStore
Gas Panel
Venting
Vac. Pumps
Heater/ChillerUnit
HydrogenBottle
H
H H
H
H
System P&ID Pipework Identification
Process and instrumentation
Identified supplierd for most of the components for the system e.g. relief valves, level indicators etc…
• Tyco (AG Series 90) Relief Valves– Pilot valves – quick acting– 3% tolerance on set
pressure– Closes at 95% of set
pressure– Response time is <0.5s
• BS&B Low Pressure Reverse Buckling Disc– ±5% tolerance on burst
pressure– Vacuum/back pressure
resistant• Hand Valves can be locked off
as necessary
Also specified temperature sensors, pumps, pressure and vacuum gauges
Hydride Bed
Original supplier is unable to provide anything We have found an alternative supplier in Austria – good specification and cheaper
• Supplier: TREIBACHER INDUSTRIE AG
– The nominal figures for the absorption temperature is -10°C and +20°C for the evolution temperature.
• Heat Transfer Medium - Water / glycolMH
• Weight: 120 kg
• Tank Structure A hull with 7 inter-connected stainless-steel storage cylinders , each with internal coil for cooling/heating .
• Dimensions Ø370 mm × L1500 mm (not including attachments), horizontal position
• Tank Total Weight 260-280 kg
• Operating Conditions:
– Charging Gas Component Hydrogen of 99.99% purity
– Charging Gas Pressure 1.2-1.7 bar abs
– Hydrogen Charging Rate Max 70 NL/min
– Discharging Gas Pressure 1.0-7.0 bar abs
Control System
• The control system will be implemented in Labview for the R&D tests.
• Once the algorithms have been developed they will be incorporated into EPICS (Experimental Physics and Industrial Control System), which is the control system that has been chosen for the MICE experiment.
Fortunately Labview possesses “Channel Access” capability, used by all EPICS clients, which will ease the subsequent transition to EPICS.
EPICS can be installed under a wide range of operating systems on a wide range of hardware platforms (eg Unix, Linux, Windows, vxWorks). The IOCs (Input Output Controllers), are traditionally built from VME cards and the 68xxx microprocessor family, running vxWorks, but other hardware platforms and operating systems are now supported. No decision has yet been taken on the hardware platforms and operating systems to be employed by MICE for EPICS.
• The control system naturally has two interfaces:– Hydrogen Absorber Cryostat system– Hydrogen Delivery system
Control System
• Hydrogen Delivery system– Normal control of the Hydrogen Delivery system can be sub-
divided as follows:• Purging the delivery system with Helium;• Filling the Hydrogen Absorber with liquid Hydrogen from the
Hydride Bed;• Maintaining the Hydrogen System in its normal running state;• Emptying the Hydrogen Absorber and returning the
Hydrogen back to the Hydride Bed.– Additionally it will be necessary to charge the Hydride Bed with
Hydrogen at the outset, and following any maintenance on the Hydride Bed.
– We are also developing the system to work with Helium
Control System – fill sequence
Chiller onSet TS1_sp = TS1_initial
PV2,3,5,7,14,17,18,19 closedCV4 closedPV1 open
VP2 on, PV20 open
Cooling System onSet TS2_sp = 15K
Start Pressure Control LoopStart Vac Monitor
Open PV2,3Open CV4
TS1<TS1_spAnd
VG3<1mbar
PG1PG1_sp
Close PV2&3 and CV4Stop Pressure Control Loop
Set TS1_sp = TS1_lowOpen PV5
LS1 > LS1_sp
H2 System Ready
Increment/DecrementTS1
EmptySequence
VG3<1mbar
Vac monitor
Pressure Control
Yes
No
Yes
No Yes
No
FillSequence
No
Yes
Other algorithms have been developed
R&D Test Cryostat
LIQUID LEVEL SENSOR 3
LIQUID LEVEL SENSOR 2
LIQUID LEVEL SENSOR 1
PRESSURE SENSOR CAPILLARY TUBE
COOLING COILTRANSFER LINE
ASECTION ON BB
A
BSECTION ON AA
B
3 CARTRIDGE HEATERS
3 CARTRIDGE HEATERS
2 LITRECAPACITY
22 LITRECAPACITY
MICE - HYDROGEN ABSORBER TEST CRYOSTAT
OHFC COPPERTUBES
1155 mm
580 mmDIAMETER
SUMITOMO SRDK-415DCOLD HEAD UNIT
PURGE GASINLETS
SHIELDEDHYDROGEN GASLINES
TOP FLANGE
Test cryostat will be sized to accommodate final absorbers.
HAZOP and FMECA
•HAZOP – HAZard and Operability assessmentThis is a formalised safety assessment that is based on nodes in the Process and Instrumentation Diagram
•FMECA – Failure Modes Effect and Criticality Analysis
This does what it says•Need to develop operational safety system
•Yury continues to develop these
Schedule
•Hydrogen delivery system review will take place 21st 22nd November•Hydride bed will be ordered soon•Cryostat – final details will be sorted out and will be ordered in the next month or so•Aim is to test mid 2006
Summary
The hydrogen system is being developed through an R&D process – the end result will be the first MICE hydrogen delivery system
Many aspects of the safety have been considered through calculation, design and review
We have a well defined safety review process
Making progress on the control, gas handling and test cryostat
Start tests mid-2006