TY - JOUR
T1 - A detailed techno-economic analysis of heat integration in high temperature electrolysis for efficient hydrogen production
AU - Buttler, Alexander
AU - Koltun, Roman
AU - Wolf, Romano
AU - Spliethoff, Hartmut
N1 - Publisher Copyright:
© 2014 Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
PY - 2015/1/5
Y1 - 2015/1/5
N2 - The effect of high temperature heat utilization in solid oxide electrolysis on efficiency and hydrogen specific cell area is investigated based on a detailed 1-D electrochemical model validated with literature data. A first feasibility analysis indicates that the mean heat transfer required to maintain isothermal conditions as a function of heat integration shows a maximum with 1426 W/m2 at a heat utilization of 0.34 kWh/Nm3 H2, which seems to be technically achievable. Based on the assumption of future specific cell area costs of 1500 €/m2 high temperature heat integration of 0.24 kWh/Nm3 is economically reasonable resulting in a reduction of the specific electric energy consumption by 7.8% (2.82 kWh/Nm3) compared to thermo-neutral operation. An extensive sensitivity analysis indicates increased electricity prices and higher lifetime of the solid oxide electrolysis cell (SOEC) stack as major parameters favoring direct heat utilization, while decreasing utilization for power-to-gas storage applications is counteracting.
AB - The effect of high temperature heat utilization in solid oxide electrolysis on efficiency and hydrogen specific cell area is investigated based on a detailed 1-D electrochemical model validated with literature data. A first feasibility analysis indicates that the mean heat transfer required to maintain isothermal conditions as a function of heat integration shows a maximum with 1426 W/m2 at a heat utilization of 0.34 kWh/Nm3 H2, which seems to be technically achievable. Based on the assumption of future specific cell area costs of 1500 €/m2 high temperature heat integration of 0.24 kWh/Nm3 is economically reasonable resulting in a reduction of the specific electric energy consumption by 7.8% (2.82 kWh/Nm3) compared to thermo-neutral operation. An extensive sensitivity analysis indicates increased electricity prices and higher lifetime of the solid oxide electrolysis cell (SOEC) stack as major parameters favoring direct heat utilization, while decreasing utilization for power-to-gas storage applications is counteracting.
KW - High temperature heat integration
KW - Isothermal operation
KW - Solid oxide electrolysis
KW - Techno-economic analysis
UR - http://www.scopus.com/inward/record.url?scp=84916214260&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2014.10.048
DO - 10.1016/j.ijhydene.2014.10.048
M3 - Article
AN - SCOPUS:84916214260
SN - 0360-3199
VL - 40
SP - 38
EP - 50
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 1
ER -
