Mice hydrogen system
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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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Mice hydrogen system

MICE Hydrogen System

Tom Bradshaw

Yury Ivanyushenkov

Elwyn Baynham

Meeting October 2004 – Coseners House


Baseline layout

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


Hydride bed

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


Hydride bed1

Black lines absorbtion

Dotted lines desorbtion

Hydride Bed

Hydride Characteristics

20l liquid = 16,000 normal litres gas – will absorb this in under 4 hours


Specification for the hydride bed

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


Effectiveness of buffer volume

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


Pressure relief valves

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.


R d process

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…


Safety review process

Safety Review Process


Mice hydrogen system

END

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


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