Start‐Up Characteristics of Segmented‐In‐Series Tubular SOFC Power Modules Improved by Catalytic Combustion at Cathodes

Kobayashi, Yoshinori; Kosaka, Kenichiro; Tomida, Kazuo; Matake, Norihisa; Ito, Kohei; Sasaki, Kazunari

doi:10.1002/fuce.201400014

Cited by 12 publications

(4 citation statements)

References 12 publications

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“…After sintering, the three layers connect each other with the size of l O , and are then cooled to temperature T. l n , which is a thermally shrunk length in each layer, is calculated by Eq. (2). l is the balanced length of a cell considering the balance of force [Eq.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, large power generation systems based on SOFCs have been developed, and their industrial use for the production of hydrogen gas as a water vapor electrolyzer has been discussed. 1), 2) Problems that limit their further implementation include high initial cost, electrochemical degradation, 3),4) mechanical reliability and mechanical durability 5) for long-term operation, and the logistics of the mass production of cells and stacks.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of in-situ Raman scattering spectroscopy for stress condition measurement in solid oxide fuel cells

Iguchi

Onuki

Shimizu

et al. 2017

J. Ceram. Soc. Japan

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A feasible study for an in-situ stress evaluation method for solid oxide fuel cells based on Raman scattering spectroscopy was performed using two anode-supported cells with a cathode interlayer made from Samarium (Sm) doped ceria. Model cells with a dense cathode interlayer demonstrated a compressive stress of ¹100s MPa at room temperature, and the results were comparable to those from X-ray diffraction. Model cells with a porous interlayer showed complex stress conditions that deviated from in-plane stress due to their porosity, and the model cell was confirmed not to be suitable for this method. At high temperatures, compressive stress was found to decrease as temperature increased and was almost neutral at the operating temperatures of the fuel cell, with good replication. Hence, the feasibility of this method for model cells with a dense cathode interlayer was confirmed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of in-situ Raman scattering spectroscopy for stress condition measurement in solid oxide fuel cells

Iguchi

Onuki

Shimizu

et al. 2017

J. Ceram. Soc. Japan

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show abstract

“…The brittle nature of SOFC structure adds to this difficulty because a rapid heat-up process can cause high temperature gradients and, consequently, high thermal stresses, which in turn results in a greater risk of SOFC delamination and cracking [12,13]. Accordingly, the long heat-up duration is known as one of the main challenges in the way of SOFC commercialization [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Simulation‐based multiobjective management of transient heating process of solid oxide fuel cell

Hami

Mahmoudimehr

2023

Fuel Cells

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A solid oxide fuel cell (SOFC) needs to be heated to an appropriate temperature (around 600°C) before it is switched to start‐up mode. A fast heat‐up process, which is naturally of interest, can cause high temperature gradients inside the SOFC and the subsequent problems of cracking and delamination. Therefore, in order for the heat‐up process to be efficiently managed, the opposing objectives (heat‐up duration and temperature gradient) have to be considered simultaneously. The present study investigates the influences of the type of temperature rise function and the average rate of temperature rise (ARTR) on each objective (heat‐up duration and temperature gradient). Beside the simple linear temperature rise function of heating fluid considered in previous studies, some innovative nonlinear functions are also introduced and examined in the present study. The results indicate that the rotated‐exponential temperature function with an ARTR of 5 K s−1 and the linear temperature function with an ARTR of 0.1 K s−1 are the best choices in terms of heat‐up duration and temperature gradient, respectively. This study also attempts to make a compromise between the two objectives and introduces the rotated‐quadratic temperature function with an ARTR of 0.4 K s−1 as a representative trade‐off solution.

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“…Regarding studies on catalytic combustion, Kobayashi et al. fabricated the experimental model of a tubular‐type SOFC and conducted research on improving the start‐up time of the system through catalytic combustion by coating a catalytic oxide on the reaction surface of the cathode . Regarding research on hot BoP system operations, Halinen et al.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis for Thermal Performance of Heat Distribution System in hot BoP of 2 kW‐class SOFC

Kim

Yoon

et al. 2019

Fuel Cells

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This study designed and tested the components of hot balance of plant (BoP) included in a 2 kW‐class solid oxide fuel cell (SOFC) system and evaluated their thermal performance. A Pd/Pt catalytic combustor was fabricated as a component of hot BoP, and integrated hot BoP with an efficient structure was fabricated by calculating the heat transfer rates of the air preheater and steam generator through a theoretical design method. It was found that placement of the air preheater in front of the steam generator exhibited the most excellent heat transfer rate. Moreover, the heat transfer rates of the designed air preheater and steam generator exceeded the upper limit of the maximum possible heat transfer of the preheated air and the water. In experimental results, the thermal efficiency of the integrated system was 60% at the reference heat input and 70% at low heat input. The oxidizing flame of the catalyst was visualized, and the oxidation characteristics of the catalytic combustor were analyzed by measuring the concentration of the final discharged gas, that is, carbon monoxide (CO). This study helps to fabricate the integrated hot BoP system, as it provides design techniques and efficient system configuration.

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Start‐Up Characteristics of Segmented‐In‐Series Tubular SOFC Power Modules Improved by Catalytic Combustion at Cathodes

Cited by 12 publications

References 12 publications

Application of in-situ Raman scattering spectroscopy for stress condition measurement in solid oxide fuel cells

Application of in-situ Raman scattering spectroscopy for stress condition measurement in solid oxide fuel cells

Simulation‐based multiobjective management of transient heating process of solid oxide fuel cell

Experimental Analysis for Thermal Performance of Heat Distribution System in hot BoP of 2 kW‐class SOFC

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