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System Concept and Process Layout for a Mirco-CHP Unit based on Low Temperature SOFC. Thomas Pfeifer 1 , Laura Nousch 1 , Wieland Beckert 1 , Dick Lieftink 2 , Stefano Modena 3 (1) Fraunhofer IKTS, (2) Hygear Fuel Cell Systems, (3) SOFCPower. 10th European SOFC Forum 2012

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system concept and process layout for a mirco chp unit based on low temperature sofc

System Concept and Process Layout for a Mirco-CHP Unit based on Low Temperature SOFC

Thomas Pfeifer1, Laura Nousch1, Wieland Beckert1, Dick Lieftink2, Stefano Modena3

(1) Fraunhofer IKTS, (2) Hygear Fuel Cell Systems, (3) SOFCPower

10th European SOFC Forum 2012

Lucerne, June 26 - 29, 2012

what is lotus low temperature sofc chp system
What is LOTUS?Low Temperature SOFC µ-CHP System
  • Project of FCH JU (Fuel Cells and Hydrogen Joint Undertaking)
  • 3 year project: January 2011- December 2013
  • Objectives:
    • CHP system at reduced stack-temperature of 650°C based on ASC technology
    • low cost, mass-produced and proven components
    • high electrical efficiency (min. 45%) and high total system efficiency
    • appropriate solutions for real-world operation
lotus design studies 0 d stack model parameterization sofc dll
LOTUS Design Studies0-D Stack-Model Parameterization (sofc.dll)
  • U/I-Measurements at varying temperature and fuel-input provided by SOFCPower.
  • Model parameters identified by least squares fit of area specific cell resistance.
lotus design studies stack performance estimation at 650 c

Expected Development:ASC700+20%66 x 80 cm², CH4-SR Reformate

LOTUS Design StudiesStack Performance Estimation at 650 °C

SOFCPower ASC700+20%

enables LOTUS-development

  • Available Cell Technology:ASC70066 x 50 cm², CH4-SR Reformate

650 WDC @ 70% FU

UCell = 0.7 V

1550 WDC @ 70% FU

UCell = 0.7 V

lotus stack development recent test results by sofc power
LOTUS Stack DevelopmentRecent Test-Results by SOFC Power
  • short-stack performance improvement is demonstrated under H2/N2 mixture

700°C

650°C

lotus design studies evaluation of fuel reforming options
LOTUS Design StudiesEvaluation of Fuel Reforming Options
  • Stack-Internal Reforming (IR)
  • Pre-Reforming

IR-SOFC

Fuel

H2O

Fuel

POX

SOFC

800 °C

650 °C

Steam Refor-

ming (SR)

Air

Heat

POX

ATR

Fuel

Fuel

ATR

SR

SOFC

SOFC

ATR

Autothermal

Reforming (ATR)

H2O

H2O

POX

Air

Heat

Partial Oxi-

dation (POX)

SR

SR

lotus design studies boundary conditions for the lotus system design
LOTUS Design StudiesBoundary Conditions for the LOTUS System Design
  • stack temperature predetermines reforming temperature  650 °C
  • soot-free reformer operation requires S/C ~ 2 .. 3
  • in practical µCHP-operation a lower system S/C is essential
  • controlled stack-internal reforming (IR) is beneficial for system efficiency
  • for start-up and shut-down of ASC a reducing atmosphere > 300 °C is required
  • part load operation and independent control of power to heat ratio is beneficial for system economics
  • LOTUS system design is governed
  • by the fuel reforming concept and its process integration
lotus system design process flow diagram pfd

~

Electricity

=

SB

-

Start-up

Burner

FBP

Fuel Bypass

SR

SOFC

Stack

Steam

Reformer

AB

After-

burner

Fuel

APH

Air Pre-Heater

Air

EVP

Water

Evaporator

CHP-Hx

Heat

Heat

Exchanger

Exhaust

LOTUS System DesignProcess Flow Diagram (PFD)
  • Implementation of the LOTUS Fuel Reforming Concept
    • fuel bypass (FBP) for controlled stack-internal reforming
    • downscaled steam reformer (SR)
    • SR directly heated by burner exhaust (AB or SB)
    • optional use of oxidative steam reforming
lotus component development steam reformer pre test
LOTUS Component DevelopmentSteam Reformer Pre-Test

supports coated with reformer catalyst

reformer test rig …

slide12

LOTUS Component DevelopmentBurner Pre-Test

test-rig and model of dual-use burner

control panel for testing of the dual-use burner prototype

slide13

LOTUS Component DevelopmentBlower Development

two stage high pressure blower with EC motor- prototype

CFD simulation of the two stage high pressure blower

thanks for your attention
Thanks for your attention!

www.lotus-project.eu

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