Measurement of Solid Oxide Fuel Cell System Flow Rate by Tracer Gas Method

2006 ◽  
Vol 4 (3) ◽  
pp. 369-372
Author(s):  
Masatsugu Amano ◽  
Tohru Kato ◽  
Akira Negishi ◽  
Ken Kato ◽  
Ken Nozaki ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Flow Rate ◽  
Calibration Method ◽  
Cell System ◽  
Fuel Cell System ◽  
Mixed Gas ◽  
Tracer Gas ◽  
Sampling System ◽  
Fuel Gas ◽  
Sonic Nozzle

A high-precision method to measure efficiency of fuel cells with a 0.1% margin of error is proposed. This method is principally divided into two procedures: determining the composition of fuel gas to be fed into a fuel cell system and measuring the flow rate of the fuel gas. The composition of the fuel gas is determined by an FTIR (Fourier transform infrared spectrometer) and/or a QMS (quadrapole mass spectrometer) with a built-in sonic nozzle sampling system. The flow rate was measured by the tracer gas method; that is, a given amount of tracer gas, such as one of the noble gases, was introduced into the line of the fuel gas, then, the mixed gas was sampled at the point where the tracer gas had been well mixed, and the concentration of the tracer gas was determined by the QMS. In this paper, a gravimetric calibration method using a highly sensitive balance is also proposed for flow control of the tracer gas. Also proposed are calibration of the FTIR and the QMS to establish the required low uncertainty or high accuracy of the measurement of the efficiency.

Critical flow rate of anode fuel exhaust in a PEM fuel cell system

2006 ◽  
Vol 156 (2) ◽  
pp. 512-519 ◽  
Author(s):  
Wenhua H. Zhu ◽  
Robert U. Payne ◽  
Bruce J. Tatarchuk
Keyword(s):  
Fuel Cell ◽  
Flow Rate ◽  
Pem Fuel Cell ◽  
Cell System ◽  
Critical Flow ◽  
Fuel Cell System ◽  
Critical Flow Rate

Estimating Air Flow Rates in a Fuel Cell System Using Electrochemical Impedance

2008 ◽  
Author(s):  
Judith O’Rourke ◽  
Murat Arcak ◽  
Manikandan Ramani
Keyword(s):  
Fuel Cell ◽  
Flow Rate ◽  
Electrochemical Impedance ◽  
Air Flow ◽  
Ac Impedance ◽  
Cell System ◽  
Fuel Cell System ◽  
Impedance Measurements ◽  
Flow Rates ◽  
Current Densities

This paper proposes the use of electrochemical impedance spectroscopy (EIS) to estimate the cathode flow rate in a fuel cell system. Through experimental testing of an eight-cell, hydrogen-fueled polymer electrolyte stack, it shows that the ac impedance measurements are highly sensitive to the air flow rates at varying current densities. The ac impedance magnitude at 0.1Hz allows the distinction of air flow rates (stoichiometry of 1.5–3.0) at current densities as low as 0.1A/cm2. Using experimental data and regression analysis, a simple algebraic equation that estimates the air flow rate using impedance measurements at a frequency of 0.1Hz is developed. The derivation of this equation is based on the operating cell voltage equation that accounts for all the irreversibilities.

A Portable Fuel Cell System Using Activated Aluminum

2012 ◽  
Vol 132 (10) ◽  
pp. 997-1002 ◽  
Author(s):  
Koji Maekawa ◽  
Kenji Takahara ◽  
Toshinori Kajiwara
Keyword(s):  
Fuel Cell ◽  
Cell System ◽  
Fuel Cell System

Evaluation of Electric Load Following Capability on Fuel Cell System Fueled by High-Purity Hydrogen

2011 ◽  
Vol 131 (12) ◽  
pp. 927-935
Author(s):  
Yusuke Doi ◽  
Deaheum Park ◽  
Masayoshi Ishida ◽  
Akitoshi Fujisawa ◽  
Shinichi Miura
Keyword(s):  
Fuel Cell ◽  
High Purity ◽  
Cell System ◽  
Electric Load ◽  
Fuel Cell System ◽  
Load Following ◽  
High Purity Hydrogen
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