An Interpretation of Time-Resolved Oxygen Concentration Measurements in Coal-Burning Fluidized Beds

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Title An Interpretation of Time-Resolved Oxygen Concentration Measurements in Coal-Burning Fluidized Beds
Creator Walsh, Peter M.; Li, Chengzhi; Beer, Janos M.
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1983
Spatial Coverage Akron, Ohio
Abstract Oxygen mole fractions were measured during combustion of high volatile bituminous coal in an atmospheric pressure fluidized bed using in situ sensors based on Pt,O2;ZrO2;O2,Pt electrochemical cells. The response time of the sensor is relatively rapid (30 ms) and the timedependent cell potential therefore provides information on the frequencies and limits of the O2 concentration fluctuations in AFBC. The random character of the 0 fluctuations and the possibility that the outer Pt electrode catalyzes 0 reactions complicate the interpretation of the data. At heights not too close to the air distributor two peaks are typically observed in the probability density distribution of the cell potential. One peak corresponds to an O2 mole fraction of the same order of magnitude as that estimated by assuming equilibration of O2 with CO and CO2. The other peak typically corresponds to mole fractions large enough that 0 consumption by CO and hydrocarbons at the Pt surface may be neglected. The shape of the high-O2 peak is roughly that of a gamma probability density function. The fit of an analytic function to the distribution is convenient for the manipulation of the data, for example in the calculation of the time-averaged O2. When the O2 consumption reaction is pseudo-first-order, the distribution of cell potentials is equivalent to a residence time distribution.
Type Text
Format application/pdf
Language eng
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Setname uu_afrc
ID 654
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