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An experimental study of catalytic a...

Ahn, Jeongmin.

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An experimental study of catalytic and non-catalytic reaction in heat recirculating reactors and applications to power generation.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	An experimental study of catalytic and non-catalytic reaction in heat recirculating reactors and applications to power generation./
Author:	Ahn, Jeongmin.
Description:	83 p.
Notes:	Adviser: Paul D. Ronney.
Contained By:	Dissertation Abstracts International67-05B.
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3220081
ISBN:	9780542712777

An experimental study of catalytic and non-catalytic reaction in heat recirculating reactors and applications to power generation.
Ahn, Jeongmin.

An experimental study of catalytic and non-catalytic reaction in heat recirculating reactors and applications to power generation. - 83 p.

Adviser: Paul D. Ronney.

Thesis (Ph.D.)--University of Southern California, 2005.

An experimental study of the performance of a Swiss roll heat exchanger and reactor was conducted, with emphasis on the extinction limits and comparison of results with and without Pt catalyst. At Re<40, the catalyst was required to sustain reaction; with the catalyst self-sustaining reaction could be obtained at Re less than 1. Both lean and rich extinction limits were extended with the catalyst, though rich limits were extended much further. At low Re, the lean extinction limit was rich of stoichiometric and rich limit had equivalence ratios 80 in some cases. Non-catalytic reaction generally occurred in a flameless mode near the center of the reactor. With or without catalyst, for sufficiently robust conditions, a visible flame would propagate out of the center, but this flame could only be re-centered with catalyst. Gas chromatography indicated that at low Re, CO and non-C3 H8 hydrocarbons did not form. For higher Re, catalytic limits were slightly broader but had much lower limit temperatures. At sufficiently high Re, catalytic and gas-phase limits merged.

ISBN: 9780542712777Subjects--Topical Terms:

1018395
Engineering, Aerospace.

An experimental study of catalytic and non-catalytic reaction in heat recirculating reactors and applications to power generation.
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008 110517s2005 ||||||||||||||||| ||eng d
020 $a 9780542712777
035 $a (UMI)AAI3220081
035 $a AAI3220081
040 $a UMI $c UMI
100 1 $a Ahn, Jeongmin. $3 1264023
245 1 3 $a An experimental study of catalytic and non-catalytic reaction in heat recirculating reactors and applications to power generation.
300 $a 83 p.
500 $a Adviser: Paul D. Ronney.
500 $a Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2788.
502 $a Thesis (Ph.D.)--University of Southern California, 2005.
520 $a An experimental study of the performance of a Swiss roll heat exchanger and reactor was conducted, with emphasis on the extinction limits and comparison of results with and without Pt catalyst. At Re<40, the catalyst was required to sustain reaction; with the catalyst self-sustaining reaction could be obtained at Re less than 1. Both lean and rich extinction limits were extended with the catalyst, though rich limits were extended much further. At low Re, the lean extinction limit was rich of stoichiometric and rich limit had equivalence ratios 80 in some cases. Non-catalytic reaction generally occurred in a flameless mode near the center of the reactor. With or without catalyst, for sufficiently robust conditions, a visible flame would propagate out of the center, but this flame could only be re-centered with catalyst. Gas chromatography indicated that at low Re, CO and non-C3 H8 hydrocarbons did not form. For higher Re, catalytic limits were slightly broader but had much lower limit temperatures. At sufficiently high Re, catalytic and gas-phase limits merged.
520 $a Experiments with titanium Swiss rolls have demonstrated reducing wall thermal conductivity and thickness leads to lower heat losses and therefore increases operating temperatures and extends flammability limits. By use of Pt catalysts, reaction of propane-air mixtures at temperatures 54°C was sustained. Such low temperatures suggest that polymers may be employed as a reactor material. A polyimide reactor was built and survived prolonged testing at temperatures up to 500°C. Polymer reactors may prove more practical for microscale devices due to their lower thermal conductivity and ease of manufacturing.
520 $a Since the ultimate goal of current efforts is to develop combustion driven power generation devices at MEMS like scales, a thermally self-sustaining miniature power generation device was developed utilizing a single-chamber solid-oxide-fuel-cell (SOFC) placed in a Swiss roll. With the single-chamber design, fuel/oxygen crossover due to cracking of seals via thermal cycling is irrelevant and coking on the anode is practically eliminated. SOFC power densities up to 420mW/cm2 were observed at low Re. These results suggest that single-chamber SOFC's integrated with heat-recirculating reactors may be a viable approach for small-scale power generation devices.
590 $a School code: 0208.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0538
690 $a 0548
710 2 $a University of Southern California. $3 700129
773 0 $t Dissertation Abstracts International $g 67-05B.
790 $a 0208
790 1 0 $a Ronney, Paul D., $e advisor
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3220081