scholarly journals Experimental and Numerical Study of Various MT-SOFC Flow Manifold Techniques: Single MT-SOFC Analysis

2013 ◽  
Vol 10 (1) ◽  
Author(s):  
V. Lawlor ◽  
K. Klein ◽  
C. Hochenauer ◽  
S. Griesser ◽  
S. Kuehn ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Numerical Study ◽  
Cross Flow ◽  
Solid Oxide ◽  
Counter Flow ◽  
Current Collection ◽  
Fuel Flow ◽  
Cathode Current ◽  
Collection Point ◽  
Sofc Stacks

Standard anode supported micro tubular-solid oxide fuel cell (MT-SOFC) stacks may provide the oxidant, in relation to the fuel, in three different manifold regimes. Firstly, “co-flow” involves oxidant outside the MT-SOFC flowing co-linearly in relation to the fuel inside. Secondly, “counter flow” involves oxidant outside the MT-SOFC flowing counter-linearly in relation to the fuel inside the MT-SOFC. Finally, “cross-flow” involves the oxidant outside the MT-SOFC flowing perpendicular to the fuel flow inside the MT-SOFC. In order to examine the effect of manifold technique on MT-SOFC performance, a combination of numerical simulation and experimental measurements was performed. Furthermore, the cathode current tap location, in relation to the fuel flow, was also studied. It was found that the oxidant manifold and the location of the cathode current collection point on the MT-SOFC tested and modeled had negligible effect on the MT-SOFC's electrical and thermal performance. In this study, a single MT-SOFC was studied in order to establish the measurement technique and numerical simulation implementation as a prerequisite before further test involving a 7 cell MT-SOFC stack.

scholarly journals Performance of Cathode Current Collection Layer of Planar Solid Oxide Fuel Cell Formed Using Slurry Coating Technique

2000 ◽  
Vol 68 (5) ◽  
pp. 337-340
Author(s):  
Shunsuke TANIGUCHI ◽  
Masataka KADOWAKI ◽  
Takashi YASUO ◽  
Yukinori AKIYAMA ◽  
Yasuo MIYAKE ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Current Collection ◽  
Coating Technique ◽  
Slurry Coating ◽  
Cathode Current

scholarly journals Temperature Uniformity in Cross-Flow Double-Layered Microchannel Heat Sinks

Fluids ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 143
Author(s):  
Carlo Nonino ◽  
Stefano Savino
Keyword(s):  
Numerical Study ◽  
Cross Flow ◽  
Bottom Layer ◽  
Heat Sinks ◽  
Temperature Uniformity ◽  
Counter Flow ◽  
Microchannel Heat Sinks ◽  
Unequal Number ◽  
Flow Configurations ◽  
Header Design

An in-house finite element method (FEM) procedure is used to carry out a numerical study on the thermal behavior of cross-flow double-layered microchannel heat sinks with an unequal number of microchannels in the two layers. The thermal performance is compared with those yielded by other more conventional flow configurations. It is shown that if properly designed, i.e., with several microchannels in the top layer smaller than that in the bottom layer, cross-flow double-layered microchannel heat sinks can provide an acceptable thermal resistance and a reasonably good temperature uniformity of the heated base with a header design that is much simpler than that required by the counter-flow arrangement.

Design and Fabrication of Novel Electrode-Supported SOFC Having Honeycomb Structure

2008 ◽  
Author(s):  
Toshiaki Yamaguchi ◽  
Toshio Suzuki ◽  
Yoshinobu Fujishiro ◽  
Masanobu Awano ◽  
Sota Shimizu
Keyword(s):  
Numerical Simulation ◽  
Pressure Drop ◽  
Cost Reduction ◽  
Unit Volume ◽  
Honeycomb Structure ◽  
Current Collection ◽  
Fuel Flow ◽  
Space Saving ◽  
Channel Surface ◽  
Calculation Results

We have developed a novel and highly effective electrode-supported SOFC with honeycomb structure for intermediate temperature operation. Honeycomb supported SOFC is known as one of the most compact SOFCs due to the large electrode area per unit volume, which is attractive with regard to space saving and cost reduction. In this study, we summarized the design of channel shape, size and sequence using numerical simulation and the technologies to realize the designed honeycomb SOFC fabrication. The calculation results showed that the wall thickness and the channel size of the honeycomb had to be less than 0.22 mm and more than 0.3 mm, respectively, for the sufficient net channel surface and the acceptable pressure drop. And a cathode-honeycomb supported SOFC can be the more efficient form with the lower current collection resistance, as compared with the anode-supported type. The actually fabricated honeycomb SOFC exhibited a high volumetric power density above 1 W/cm3 at 650 °C under wet H2 fuel flow.

Performance Comparison on Cross-Flow and Counter-Flow Planar Solid Oxide Fuel Cell

2012 ◽  
Author(s):  
Huisheng Zhang ◽  
Wenshu Zhang ◽  
Zhenhua Lu ◽  
Shilie Weng
Keyword(s):  
Mathematical Model ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Cross Flow ◽  
Structure Design ◽  
Solid Oxide ◽  
Operating Voltage ◽  
Oxide Fuel ◽  
Counter Flow ◽  
Internal Reforming

Solid oxide fuel cell (SOFC) is a complicated system with heat and mass transfer as well as electrochemical reactions. The flow configuration has great impact on the system performance. Based on the established one dimensional direct internal reforming SOFC mathematical model, with the consideration of the flow, thermal and electrical characteristic, this paper developed the two dimensional mathematical model for both counter-flow and cross-flow types. Plus, the comparison and analysis of the steady distribution are performed. The results reveal that on the geometry parameters and inlet conditions, the outlet temperatures of counter-flow SOFC are lower than that of cross-flow. However, the average temperature of PEN plate is higher than cross-flow, and both the operating voltage and electric efficiency are also higher than that of cross-flow. This will be beneficial for the structure design of SOFC.

Numerical Study on Thermoelectric Performance of Cross-Flow Planar Solid Oxide Fuel Cell

2018 ◽  
Author(s):  
Haibin Lu ◽  
Changcheng Xie ◽  
Xiuwen Hua ◽  
Taosif Iqbal ◽  
Xiongwen Zhang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Current Density ◽  
Electromotive Force ◽  
Electrochemical Reaction ◽  
Numerical Study ◽  
Cross Flow ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Reactant Concentration

This paper investigates the thermoelectric characteristics of cross-flow planar type solid oxide fuel cell (SOFC) with natural gas as fuel by using a three-dimensional numerical model. The results reveal that temperature and reactant concentration increase gradually along the direction of fuel gas flow, and the reactant concentration increases in the first and subsequently decreases. In addition, the lower the temperature, the higher ideal electromotive force is as well as the less actual output electromotive force. The hydrogen concentration is positively correlated with the current density and the ideal electromotive force. However, increasing the mass flow continuously beyond the reasonable range can decrease the current and electrochemical reaction intensity. Variation in wall thickness was also simulated and found that increasing the thickness would result in higher intensity of electrochemical reaction and increased current density but at the cost of low efficiency in SOFC. Thus an optimal design can make a balance between fuel utilization and output power of SOFC.

Novel Electrode-Supported Honeycomb Solid Oxide Fuel Cell: Design and Fabrication

2010 ◽  
Vol 7 (4) ◽  
Author(s):  
Toshiaki Yamaguchi ◽  
Toshio Suzuki ◽  
Yoshinobu Fujishiro ◽  
Masanobu Awano ◽  
Sota Shimizu
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Honeycomb Structure ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Current Collection ◽  
Fuel Flow ◽  
Space Saving ◽  
Channel Surface ◽  
Calculation Results

We have developed a novel and highly effective electrode-supported solid oxide fuel cell (SOFC) with honeycomb structure for intermediate temperature operation. Honeycomb-supported SOFC is known as one of the most compact SOFCs due to the large electrode area per unit volume, which is attractive with regard to space saving and cost reduction. In this study, we summarized the design of the channel shape, size, and sequence using numerical simulation and technologies to realize the designed honeycomb SOFC fabrication. The calculation results showed that the wall thickness and the channel size of the honeycomb had to be less than 0.22 mm and more than 0.3 mm, respectively, for the sufficient net channel surface and the acceptable pressure drop. Also, a cathode-honeycomb-supported SOFC can be the more efficient form with lower current collection resistance, as compared with the anode-supported type. The actual fabricated honeycomb SOFC exhibited a high volumetric power density above 1 W/cm3 at 650°C under wet H2 fuel flow.

Numerical Simulation on the Performance of Air-Air Primary Surface Heat Exchanger

2016 ◽  
Author(s):  
Yinze Liu ◽  
Wei Dong ◽  
Guilin Lei ◽  
Xiao Yu
Keyword(s):  
Numerical Simulation ◽  
Heat Exchanger ◽  
Cross Flow ◽  
Surface Heat ◽  
Thermal Calculation ◽  
Counter Flow ◽  
High Reynolds ◽  
The Heat Balance ◽  
Calculation Software ◽  
Surface Heat Exchanger

A design software was written for the air-air primary surface heat exchanger (PSHE) based on the heat balance equation and the theory of micro channel. The two different simplified models, the quarter channel and the full channel PSHE of 0° counter-flow and the model of the full channel cross-flow PSHE with cross angle of 45° under high Reynolds number are simulated. This paper presents the comparison between the results obtained by the numerical simulation at the outlet of the PSHE and the results obtained by the thermal calculation software. The results showed that the numerical simulation is consistent with the thermal calculation of the software. Compared to the PSHE of 0°, the results of PSHE with the cross angle of 45° showed that the heat transfer performance is enhanced while the pressure drop was significantly increased.

scholarly journals Development of catalytic combustion and CO2 capture and conversion technology

2021 ◽  
Author(s):  
Zhibin Yang ◽  
Ze Lei ◽  
Ben Ge ◽  
Xingyu Xiong ◽  
Yiqian Jin ◽  
...  
Keyword(s):  
Power Generation ◽  
Fuel Cell ◽  
Catalytic Combustion ◽  
Coal Gasification ◽  
Solid Oxide ◽  
Multi Scale ◽  
Electrolysis Cells ◽  
Integrated Gasification ◽  
Solid Oxide Electrolysis Cells ◽  
Sofc Stacks

AbstractChanges are needed to improve the efficiency and lower the CO2 emissions of traditional coal-fired power generation, which is the main source of global CO2 emissions. The integrated gasification fuel cell (IGFC) process, which combines coal gasification and high-temperature fuel cells, was proposed in 2017 to improve the efficiency of coal-based power generation and reduce CO2 emissions. Supported by the National Key R&D Program of China, the IGFC for near-zero CO2 emissions program was enacted with the goal of achieving near-zero CO2 emissions based on (1) catalytic combustion of the flue gas from solid oxide fuel cell (SOFC) stacks and (2) CO2 conversion using solid oxide electrolysis cells (SOECs). In this work, we investigated a kW-level catalytic combustion burner and SOEC stack, evaluated the electrochemical performance of the SOEC stack in H2O electrolysis and H2O/CO2 co-electrolysis, and established a multi-scale and multi-physical coupling simulation model of SOFCs and SOECs. The process developed in this work paves the way for the demonstration and deployment of IGFC technology in the future.

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