new regenerative air purification system for swedish … · company restricted | not export...

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Hjalmar Unneberg | © Saab

NEW REGENERATIVE AIR PURIFICATION SYSTEMFOR SWEDISH AIP SUBMARINES

UDT 2020



AGENDA

• Swedish new AIP submarine Blekinge-class (A26)

• New CO2 Removal System

• CO2 Removal Equipment

• Steam Generator

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AUTHOR

Hjalmar Unneberg

Systems Engineer, Submarine Air Environment

At Saab Kockums since 2013

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SAAB KOCKUMS A26

The Blekinge-class submarine for the Swedish Navy is under construction

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“The aim is to build the world’s most modernsubmarine, with a working environmentcorresponding to civilian norms.

As a result, civilian work environmentrequirements are applied with an adjustmentfor continuous exposure.”



SAAB KOCKUMS BLEKINGE – KEY FIGURES

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Length 65 m

Displacement surfaced 2,000 tons

AIP endurance at patrol speed >18 days

Standard complement 26 persons (17–35)

Operational environment Tropical – arctic

Propulsion Stirling AIP and diesel electric

Weapon system 4 x weapon tubes

Multi-Mission Portal (MMP)

SOF divers lock using the MMP

Torpedoes and mines

Unmanned/manned vehicles

Combat system Combat Management System

Optronic sensors

Full sonar suite

R-ESM and C-ESM



SAAB KOCKUMS BLEKINGE – KEY FIGURES

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Length 65 m

Displacement surfaced 2,000 tons

AIP endurance at patrol speed >18 days

Standard complement 26 persons (17–35)

Operational environment Tropical – arctic

Propulsion Stirling AIP and diesel electric

Weapon system 4 x weapon tubes

Multi-Mission Portal (MMP)

SOF divers lock using the MMP

Torpedoes and mines

Unmanned/manned vehicles

Combat system Combat Management System

Optronic sensors

Full sonar suite

R-ESM and C-ESM



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NEW CO2 REMOVAL SYSTEM

• HMS Näcken

• Extended

‒ Stirling engines

‒ LOX




• Gotland class

‒ Soda Lime granulate

‒ Filled tanks

‒ Reaction vessel

‒ Good performance < 0.5 % CO2 concentration

‒ Non regenerative system

‒ Dusty

‒ Large/heavy (bulk)

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Kockums & Swedish Defence Materiel Administration

Tests in early 90’ies to find an alternative

‒ Membrane

‒ Diffusion of substances from higher to lower conc.

‒ Will diffuse all compounds, also O2 and N2

‒ Cryogenics

‒ Use of vaporised liquid oxygen (LOX) to condensate CO2‒ Can also removes VOC’s

No perfect solutions – always some problems

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• Late 80’ies

• Airbus (Dornier, EADS, Astrium)

• 55 different substances

• One superior candidate - ASTRINE™

• Developing begun…

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Started collaboration with Kockums & Swedish Defence Materiel Administration

• Demonstrator at Gotland-class in the end of 90’ies

‒ One bed system

‒ CO2 removal performance ~100 l/h

• Further tests at Airbus facilities with good results

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The result:

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Regenerative CO2 Removal System

SE= Stirling Engine | SG=Steam Generator | CO2RE=CO2 Removal Equipment

SE

SG CO2RE

Ventilation

Steam

Condensate

Hot Water System Pure CO2

To Sea




The result:

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SE= Stirling Engine | SG=Steam Generator | CO2RE=CO2 Removal Equipment

Regenerative CO2 Removal SystemSE

SG CO2RE

Ventilation

Steam

Condensate

Hot Water System Pure CO2

To Sea



SOLID AMINE ION EXCHANGE RESIN

• ASTRINE™ active resin

‒ Highly porous functionalized ion exchange resin

‒ Solid amine without spill and leakage problems

‒ Excellent adsorption performance

‒ Reversible desorption is made by pure steam

‒ Stabile, long durability

‒ Non hazard for human health

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CO2 REMOVAL EQUIPMENT

• 3 bed system

‒ Two in adsorption mode

‒ One in desorption mode

• Contains

‒ Fan

‒ Compressor

‒ Heat exchangers

‒ Valves & sensors

‒ Control system

• Totally automatic

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Bed Pure CO2Steam

Bed

Bed

Contaminant air Clean air



HOT WATER SYSTEM

• Uses excess heat from Stirling Engines

• Pressurized hot water

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SE

Hot Water System



STEAM GENERATOR

• Heat from Hot water system

• Steam dome

• Superheated steam

• Reuse the condensate from CO2RE

• Final unit successfully tested with CO2RE

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Steam

Condensate

Steam

Dome

Water

Tank

Hot Water System

CO2RE



FIGURES

• Performance

‒ Removal rate: 900 L CO2/h (1.8 kg/h)

‒ Estimated CO2 concentration on A26: 0.3%

• Energy consumption

‒ ~3.5 kWh

‒ Steam production with heat from SE

• Weight and size

‒ ~2000 kg

‒ 1,3 x 1,1 x 1,8 meters

• Consumables

‒ ASTRINE™ - at least 5000 operating hours

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CONCLUSION

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“The regenerative CO2 removal system stands forleading edge technology in the area of air revitalization.

It demands minimal space, energy and maintenanceenabling a significant increase in endurance andavailability of the Blekinge class submarines.”



QUESTIONS?

new regenerative air purification system for swedish … · company restricted | not export...

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