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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

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Front. Chem. Sci. Eng.    2018, Vol. 12 Issue (4) : 697-707    https://doi.org/10.1007/s11705-018-1774-z
RESEARCH ARTICLE
Performance assessment of a power-to-gas process based on reversible solid oxide cell
Hanaâ Er-rbib, Nouaamane Kezibri, Chakib Bouallou()
Centre for Energy Efficiency?of Systems, MINES ParisTech, PSL Research University, Paris 75006, France
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Abstract

Due to the foreseen growth of sustainable energy utilization in the upcoming years, storage of the excess production is becoming a rather serious matter. In this work, a promising solution to this issue is investigated using one of the most emerging technologies of electricity conversion: reversible solid oxide cells (RSOC). A detailed model was created so as to study the RSOC performance before implementing it in the global co-electrolysis Aspen PlusTM model. The model was compared to experimental results and showed good agreement with the available data under steady state conditions. The system was then scaled up to a 10 MW co-electrolysis unit operating at 1073 K and 3 bar. The produced syngas is subsequently directed to a methanation unit to produce a synthetic natural gas (SNG) with an equivalent chemical power of 8.3 MWth. Additionally, as a result of a heat integration analysis, the methanation process provides steam and electricity to operate the rest of the units in the process. A final CO2 capture step is added to ensure the required specifications of the produced SNG for gas network injection. Lastly, the overall performance of the power-to-gas process was evaluated taking into account the energy consumption of each unit.
Keywords renewable electricity      storage      co-electrolysis      methanation      carbone capture     
Corresponding Author(s): Chakib Bouallou   
Online First Date: 13 December 2018    Issue Date: 03 January 2019
 Cite this article:   
Hanaâ Er-rbib,Nouaamane Kezibri,Chakib Bouallou. Performance assessment of a power-to-gas process based on reversible solid oxide cell[J]. Front. Chem. Sci. Eng., 2018, 12(4): 697-707.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-018-1774-z
https://academic.hep.com.cn/fcse/EN/Y2018/V12/I4/697
Fig.1  Concept of reversible power-to-gas process
Fig.2  Power-to-gas process (RSOC at SOEC mode)
Fig.3  Representation of the RSOC unit cell
Experimental data Graves [19] Zhan et al. [20]
Temperature /K 1123 1073
Pressure /MPa 0.1 0.1
Total molar flow in fuel side /(mol?s−1) 2.84×10?4 1.74×10−4
Composition in fuel side /% 1st test 2nd test 3rd test
H2O 45 50 25 50
CO2 45 50 25 25
H2 10 0 25 25
CO 0 0 25 0
Total molar flow in air side /(mol?s?1) 5.68 ×10−4 5×10−10
Composition in air side /% 1st test 2nd test 3rd test
O2 1 1 1 1
N2 0 0 0 0
Tab.1  Experimental data used for model validation
Fig.4  (a) Graves experimental data [19] comparison and (b) Zhan et al. experimental data [20] comparison
Fig.5  Model of co-electrolyzer unit in Aspen PlusTM
Fig.6  Results of the methanation kinetic model compared to the experimental data of Kopyscinski at 593 K and 2 bar
Fig.7  Model of heat intergrated methanation unit in Aspen PlusTM
Stream Feed gas 1st Reactor outlet 2nd Reactor outlet 3rd Reactor outlet
Flow rate /(kmol?h−1) H2 103 23.4 9.83 2.60
CO 33.9 4.60 0.75 0.05
H2O 3.79 29.0 33.8 37.1
CO2 10.4 12.5 11.9 10.7
CH4 – 27.3 31.7 33.6
Temperature /K 553 909 785 654
Pressure /bar 15.4 15.2 14.0 13.4
Tab.2  Gas composition and operating conditions for the methanation process
Fig.8  Hot and cold composite curves of the methanation unit
Fig.9  Model of CO2 capture unit in Aspen PlusTM
BOP Component Electric consumption /kW Unrecovered cooling power
Thermal power /kW Hot source temperature /K Corresponding electric power /kW
Co-electolyzer unit Electric heater 64.7 – – –
Cooler – –57.9 343 –8.45
Methanation unit Condenser – –620 441 –208
Gas compressor 534 – – –
Recycle compressor 22.4 – – –
Pump 6.75 – – –
CO2 capture unit MEA cooler – –258 330 –29.1
Pump 6.60 – – –
Total BOP consumption 634.5 Unrecovered heat –245.5
Tab.3  BOP components consumption and unrecovered power
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