Patrick Löb, Christian Hofmann, Ulrich Krtschil, Gabriele ......© Fraunhofer ICT-IMM – P. Löb,...
Transcript of Patrick Löb, Christian Hofmann, Ulrich Krtschil, Gabriele ......© Fraunhofer ICT-IMM – P. Löb,...
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Patrick Löb, Christian Hofmann, Ulrich Krtschil, Gabriele Menges-Flanagan Bereich Energie- und ChemietechnikFraunhofer ICT-IMM, Mainz
NUTZUNG ADDITIVER FERTIGUNGSVERFAHRENZUR REALISIERUNG STRUKTURIERTER CHEMISCHER REAKTOREN
Ludwigshafen, 16. März 2017
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Content
Introduction
Background Fraunhofer ICT-IMM Additive manufacturing / Selective Laser Melting (SLM)
for metallic parts
Examples of microstructured reactors of Fraunhofer ICT-IMM realisedby SLM (by multiple external service providers):
Compact cylindrical microstructured devices (three different versions)
Lab-scale microreactor modules for process development
Special reactor in lab- and pilot-/small production scale for the synthesis of Grignard reagents
Cost considerations
Related examples from literature
Summary - Advantages/potentials – disadvantages/limitations
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Fraunhofer ICT-IMM and its services in the field of Chemical Micro Process Engineering
All activities are dedicated to the optimisation or reinvention of chemical production processes by methods and components of chemical micro process technology.
Offered services:
Development, realisation and provision of components and plants
Microreactors for lab scale & for pilot and production scale
Specialised micro structured apparatuses
Individual small scale plants
Process development up to piloting and production (focus on organic chemistry)
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ICT-IMM has a long track in developing and realizing microstructured reactors
micro mixers
micro heat exchangers
micro reactors for heterogeneouslycatalysed reactions
micro reactors forelectroorganic synthesis
micro structuredg/l contacting devices
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Example 1: Compact cylindrical microstructured devices- Tubular Heat Transfer Micro Device First contact! - First microstructure-bearing metallic (stainless steel)
component of Fraunhofer ICT-IMM realised by additive manufacturing
Tubular Heat Transfer Micro Device (THTMD)
„conventional“ device
3D printed device
“Conventional” device realised in several steps using costly manufacturing technology
Simplification of realisation
Positive experience regular consideration of additive manufacturing also for the realisation of structured, metallic components
wire spark erosionlaser welding
Why additive manufacturing?0.3 mm x 1.2 mm x 100 mm
Channels inside: ca. 0.5 mm x 2 mm x 100 mm
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Example 1: Compact cylindrical microstructured devices- Cylindrical microstructured heat exchanger
Further processing: addition of tubes by laser welding
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Example 1: Compact cylindrical microstructured devices- Cylindrical microstructured heat exchangerIllustration of functional principle
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Example 1: Compact cylindrical microstructured devices- Cylindrical microstructured heat exchanger
Hole required for fabrication process (powder removal)& for later use for insertion of an thermocouple
Cross section
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Example 1: Compact cylindrical microstructured devices- Cylindrical microstructured heat exchanger
ca. 650 μm ca. 340 μm
Typical layer thickness: 30 – 50 μm
Structure precision and surface quality
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Example 2: Lab-scale modular microreactor realised byadditive manufacturing
Explosion view of a singlemicroreactor module
Distributor/cover plate
Core reaction module
heat exchange fluidreaction fluid
Target application: organic-chemical reactions, lab process development
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Example 2: Lab-scale modular microreactor realised byadditive manufacturing
Reactor assembly ofthree single modules
Single reactormodule Why additive manufacturing?
Prototype production, i.e. small numbers required
Complex device Conventional fabri-cation more expensive.
Fast realisation (typically < 10 work. days)
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Example 3: Special reactor in lab- and pilot-/small production scale for the synthesis of Grignard reagents
Ca.
100
mm
Inner diameter:ca. 20 mm
Lab-scale reactorCore cartridge reactor
Distributor plate withintegrated heat exchanger
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Example 3: Special reactor in lab- and pilot-/small production scale for the synthesis of Grignard reagents
pilot-/small productionscale reactor
ca. 73 cm
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Cost considerations Example: microreactor module in two scales
About 0.2 L reaction volume & about 2.3 L reaction volume
Considered cases:
Additive manufacturing
Plate stack: plate structuring by roll embossing, brazing
Plate stack: plate structuring by wet chemical etching, brazing Allgemeine Annahmen: Fertigung von 1 Stück, ohne Deckel und Anschlüsse, ohne Konstruktion, etc.
Pilot-scaleIndustrial-
scale
Walzen, löten 1,5 3,6 Annahme: Walzen und Walzstraße vorhanden
Ätzen, löten 1,0 3,2
Selektives Laserschmelzen (3D-Drucken)
1,3 10,0Annahme f. Industrial-scale: Extrapolation aus vorhandenen Angeboten, kann ggf. erheblich
günstiger werden
Fertigungsverfahren Bemerkungen:Reaktorgröße
Anmerkung: Die Variante "Walzen" bestehen aus viel mehr Einzelteilen, das bedeutet mehr manuellen Montageaufwand
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Summary
Advantages / potentials
Fast realisation of prototypes, small devices, small serial production
In this context then also advantageous in view of costs compared to conventional fabrication approaches
Additive manufacturing allows also complex geometries (e.g. fluid guidance) typically realisable by conventional manufacturing only in several steps
Micro-/milli-structuring: so far reached/used
Closed channels: down to 0.5 mm x 0.5 mm x 100 mm
Open structures, e.g. fins: down to 0.2 mm x 0.6 mm
Remaining wall thicknesses - Separation layers between different fluids: ca. 0.5 mm- Fins between channels: ca. 0.3 mm
Examples from Fraunhofer ICT-IMM working areas shown
Focused on realising prototypes or small series of devices
SLM manufacturing done by external service providers
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Summary
Disadvantages / limitations
Efforts and know-how required to adopt the design according to SLM manufacturing
For higher piece numbers (serial production) typically no dramatic decrease of price per piece (no typical economy of scale). Then again competition with conventional approaches
Smaller structures limited by layer thickness, melting process and surface roughness.
Interaction with external service providers needed, e.g. exchange of CAM files
Limited control over the manufacturing process (e.g. part orientation during fabrication)
Siehe auch zum Vergleich: DECHEMA / Praxisforum – 2015: White Paper: Die 7 Mythen der Additiven Fertigung
Kontakt: Dr. Patrick Löb - [email protected]