Design of a thermally integrated bioethanol-fueled solid oxide fuel cell system integrated with a distillation column |
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| Authors: | W. Jamsak P.L. Douglas E. Croiset R. Suwanwarangkul N. Laosiripojana S. Charojrochkul S. Assabumrungrat |
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| Affiliation: | 1. Center of Excellence in Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Thailand;2. Department of Chemical Engineering, University of Waterloo, Canada;3. School of Bio-Chemical Engineering and Technology, Sirindhorn International Institute of Technology, Thammasart University-Rangsit Campus, Patum Thani 12121, Thailand;4. The Joint Graduate School of Energy and Environment, King Mongkut''s University of Technology, Thonburi, Thailand;5. National Metal and Materials Technology Center (MTEC), Thailand |
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| Abstract: | Solid oxide fuel cell systems integrated with a distillation column (SOFC-DIS) have been investigated in this study. The MER (maximum energy recovery) network for SOFC-DIS system under the base conditions (CEtOH = 25%, EtOH recovery = 80%, V = 0.7 V, fuel utilization = 80%, TSOFC = 1200 K) yields QCmin = 73.4 and QHmin = 0 kW. To enhance the performance of SOFC-DIS, utilization of internal useful heat sources from within the system (e.g. condenser duty and hot water from the bottom of the distillation column) and a cathode recirculation have been considered in this study. The utilization of condenser duty for preheating the incoming bioethanol and cathode recirculation for SOFC-DIS system were chosen and implemented to the SOFC-DIS (CondBio-CathRec). Different MER designs were investigated. The obtained MER network of CondBio-CathRec configuration shows the lower minimum cold utility (QCmin) of 55.9 kW and total cost index than that of the base case. A heat exchanger loop and utility path were also investigated. It was found that eliminate the high temperature distillate heat exchanger can lower the total cost index. The recommended network is that the hot effluent gas is heat exchanged with the anode heat exchanger, the external reformer, the air heat exchanger, the distillate heat exchanger and the reboiler, respectively. The corresponding performances of this design are 40.8%, 54.3%, 0.221 W cm−2 for overall electrical efficiency, Combine Heat and Power (CHP) efficiency and power density, respectively. The effect of operating conditions on composite curves on the design of heat exchanger network was investigated. The obtained composite curves can be divided into two groups: the threshold case and the pinch case. It was found that the pinch case which TSOFC = 1173 K yields higher total cost index than the CondBio-CathRec at the base conditions. It was also found that the pinch case can become a threshold case by adjusting split fraction or operating at lower fuel utilization. The total cost index of the threshold cases is lower than that of the pinch case. Moreover, it was found that some conditions can give lower total cost index than that of the CondBio-CathRec at the base conditions. |
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| Keywords: | Solid oxide fuel cell Integration Bioethanol Distillation unit Heat exchanger network |
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