Influence of Gas Flow Rate on Performance of H[sub 2]S/Air Solid Oxide Fuel Cells with MoS[sub 2]-NiS-Ag Anode

2003 ◽  
Vol 150 (4) ◽  
pp. A463 ◽  
Author(s):  
G. L. Wei ◽  
M. Liu ◽  
J. L. Luo ◽  
A. R. Sanger ◽  
K. T. Chuang
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Flow Rate ◽  
Gas Flow ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Gas Flow Rate

Study of a Fuel Supply Pump With a Piezoelectric Effect for Micro Solid Oxide Fuel Cells

2008 ◽  
Author(s):  
H. K. Ma ◽  
S. H. Huang ◽  
B. R. Chen ◽  
Y. J. Huang
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Flow Rate ◽  
Solid Oxide ◽  
Injection System ◽  
Oxide Fuel ◽  
Fuel Injector ◽  
Ethanol Injection ◽  
Piezoelectric Device ◽  
Pump Chamber

A novel design for an ethanol injection system has been proposed, which consists of the fuel injector, two valves, one pump chamber, and one piezoelectric device (central vibration). The system uses a micro-diaphragm pump with a piezoelectric device for the micro solid oxide fuel cells (SOFC), which operate at a low temperature (550 to 600 °C) and are supplied by Enerage Inc. The diameters of the pump chamber are 31 mm and 23mm, and the depths of the chamber are 1 mm and 2 mm. When the piezoelectric device actuates for changing pump chamber volume, the valves will be opened/closed, and the ethanol will be delivered into SOFC system due to its pressure variation. The dimensions of the injector chamber, vibration frequencies of piezoelectric (PZT) device, input voltages, and valve thickness and shape, are used as important parameters for the performance of the novel ethanol injection system. The experimental results show that the ethanol flow rate can reach 170ml/min at a piezoelectric device frequency of 75Hz. In addition, the ethanol flow rate is higher than the water flow rate.

Simulation of Surface Reactions and Multiscale Transport Processes in a Composite Anode Domain Relevant for Solid Oxide Fuel Cells

2013 ◽  
Vol 10 (2) ◽  
Author(s):  
Jinliang Yuan ◽  
Guogang Yang ◽  
Bengt Sunden
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Gas Phase ◽  
Gas Flow ◽  
Surface Reactions ◽  
Transport Processes ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Internal Reforming ◽  
Reforming Reactions

There are various transport phenomena (gas-phase species, heat, and momentum) occurring at different length scales in anode-supported solid oxide fuel cells (SOFCs), which are strongly affected by catalytic surface reactions at active triple-phase boundaries (TPBs) between the void space (for gas), Ni (catalysts for electrons), and YSZ (an electrolyte material for ions). To understand the multiscale chemical-reacting transport processes in the cell, a three-dimensional numerical calculation approach (the computational fluid dynamics (CFD) method) is further developed and applied for a composite domain including a porous anode, fuel gas flow channel, and solid interconnect. By calculating the rate of microscopic surface-reactions involving the surface-phase species, the gas-phase species/heat generation and consumption related to the internal reforming reactions have been identified and implemented. The applied microscopic model for the internal reforming reactions describes the adsorption and desorption reactions of six gas-phase species and surface reactions of 12 surface-adsorbed species. The predicted results are presented and analyzed in terms of the gas-phase species and temperature distributions and compared with those predicted by employing the global reaction scheme for the internal reforming reactions.

Mass/Charge Transfer in Mono-Block-Layer-Built-Type Solid-Oxide Fuel Cells

2005 ◽  
Vol 2 (3) ◽  
pp. 164-170 ◽  
Author(s):  
J. J. Hwang
Keyword(s):  
Fuel Cells ◽  
Charge Transfer ◽  
Solid Oxide Fuel Cells ◽  
Gas Flow ◽  
Average Pore Size ◽  
Porous Electrodes ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Average Pore ◽  
Block Layer

The mass/charge transfer characteristics in a simulated MOLB (mono-block-layer built)-type solid-oxide fuel cells have been studied numerically. The transport phenomena within a linear MOLB module, including flow channels, active porous electrodes, electrolyte, and interconnections, are simulated using the finite volume method. The gas flow in the porous electrodes is governed by the isotropic linear resistance model with constant porosity and permeability. The diffusions of reactant species in the porous electrodes are described by the Stefan-Maxwell relation. Effective diffusivities for porous layers follow the Bruggman model. Porous electrochemistry is depicted via surface reactions with a constant surface-to-volume ratio, tortuosity, and average pore size. Results of the cathode-supported cell and the anode-supported cell are obtained, discussed, and compared thereafter for the first time.

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