1 MICE Hydrogen System Elwyn Baynham, Tom Bradshaw, Iouri Ivaniouchenkov RAL MICE / RAL Safety...
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Transcript of 1 MICE Hydrogen System Elwyn Baynham, Tom Bradshaw, Iouri Ivaniouchenkov RAL MICE / RAL Safety...
1
MICE Hydrogen System
Elwyn Baynham, Tom Bradshaw, Iouri Ivaniouchenkov
RAL
MICE / RAL Safety Meeting @ RAL, 30 October 2003
2
Hydrogen system: Conceptual points
• Closed system concept :
- hydrogen absorber and a storage unit form a single closed system in a way that hydrogen is either stored as a gas in the storage unit or is liquefied in the absorber;
- pressure in the system is always higher than the atmospheric pressure.
• Individual hydrogen system for each absorber
MICE / RAL Safety Meeting @ RAL, 30 October 2003
Ideally it is a truly passive system
Air can not leak inside the system
Safety pros:
Minimal amount of hydrogen per system
3
Hydrogen system: Options
Hydrogen storage unit = large (about 30 m3) tank Pros: truly passive system Cons: about 100 m3 for the location of tanks (=> on the roof ?)
MICE / RAL Safety Meeting @ RAL, 30 October 2003
4
Hydrogen system: Options
Alternative option:
Hydrogen storage unit = compact (< 1 m3) metal hydride bed
Pros: - very compact system (easier to collect hydrogen in case of leak) - hydrogen is stored as a solid compound Cons: not a passive system (requires active heater/cooler)
A question then: is it a reasonable compromise from the safety point of view ?
MICE / RAL Safety Meeting @ RAL, 30 October 2003
5P P VP Vacuum pumpBursting disk
Pressure relief valveValve
Pressureregulator
Pressuregauge
18 K Heto Compressorvia Radiation shield
14 K Hefrom Cold box
Liquid level gauge
LH2 Absorber
Vacuum
Vacuum vessel
LHe Heat exchanger
Hydrogen flow and safety system(option with a hydrogen tank)
Internal Window
70 K Safety window
H2 Gas bottle
PPFill valve
Hydrogen tank
Volume: about 30 m3
1.6 bar abs > Pressure > 1.1 bar abs
Vent outside flame arrester
He Purge system
Non-return valve
Vent outsideflame arrester
Vent valve
Vent valve
1.7 bar
2.1 bar
H2 Detector
H2 Detector
P
P
PP
Evacuated vent buffer tank
VP
P
VP
X 2X 2
VP
Version: 09/06/2003
Hydrogen module enclosure
H2 Detector
Ventilationsystem
Vent outsideflame arrester
Node 1
Node 2
Node 3
Node 4
Node 5
6P P VP Vacuum pumpBursting disk
Pressure relief valveValve
Pressureregulator
Pressuregauge
18 K Heto Compressorvia Radiation shield
14 K Hefrom Cold box
Liquid level gauge
LH2 Absorber
Vacuum
Vacuum vessel
LHe Heat exchanger
Hydrogen flow and safety system (option with a metal hydride storage unit)
Internal Window
70 K Safety window
H2 Gas bottle
PPFill valve
Metal hydride hydrogen storage unit
(20 m3 capacity)
Vent outside flame arrester
He Purge system
Non-return valve
Vent outsideflame arrester
Vent valve
Vent valve
1.7 bar
2.1 bar
H2 Detector
H2 Detector
P
P
PP
Evacuated vent buffer tank
VP
P
VP
X 2X 2
VP
Version: 06/08/2003
Hydrogen module enclosure
H2 Detector
Ventilationsystem
Vent outsideflame arrester
Chiller/ heaterunit
Node 1
Node2
Node 3
Node 4
Node 5
7MICE / RAL Safety Meeting @ RAL, 30 October 2003
Hydrogen system layout: Option with a hydrogen tank
Concrete radiation shielding Steel magnetic shielding
Hydrogen storage tank
H2 absorber
H2 buffertank
8
H2
Storage unit
Ventilation duct
Radiationshieldingwall
H2
Buffer Tank
(1m3 approx)
H2 absorber
Vacuum jacket
MICE / RAL Safety Meeting @ RAL, 30 October 2003
Hydrogen system layout: Option with a hydrogen bed
9MICE / RAL Safety Meeting @ RAL, 30 October 2003
Hydrogen system layout: Option with a hydrogen bed
10
MICE Layout Version: 28 October 2003
MICE / RAL Safety Meeting @ RAL, 30 October 2003
11MICE / RAL Safety Meeting @ RAL, 30 October 2003
Preliminary HAZOP recommendations
Hydrogen storage unit Implement: active pressure gauge temperature monitor
Hydrogen absorber internal vessel with hydrogen windows Implement: active pressure gauge temperature sensor active liquid level meter (additional) Hydrogen absorber vacuum jacket with safety windows Implement: active hydrogen sensor
Buffer tank Implement: active pressure gauge active oxygen sensor
Hydrogen module enclosure Implement: ventilation system equipped with hydrogen detector.