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| 001 |
in00001817367 |
| 005 |
20190325110804.0 |
| 008 |
040309s2003 xx a b 000 0 eng d |
| 035 |
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|a (OCoLC)ocm54664300
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| 037 |
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|a 30-88115
|b UMI
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| 040 |
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|a TXA
|c TXA
|d UtOrBLW
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| 049 |
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|a TXAM
|a TXAR
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| 099 |
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|a 2003
|a Dissertation
|a B325
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| 100 |
1 |
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|a Baek, Ki-Hyun,
|d 1968-
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| 245 |
1 |
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|a Selective non-catalytic reduction of NOx by ammonia :
|b experiments and model calculations /
|c by Ki-Hyun Baek.
|
| 264 |
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1 |
|a [Place of publication not identified] :
|b [publisher not identified] ;
|c 2003.
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| 300 |
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|a xxiii, 262 leaves :
|b illustrations ;
|c 28 cm.
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| 336 |
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|a text
|b txt
|2 rdacontent
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| 337 |
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|a unmediated
|b n
|2 rdamedia
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| 338 |
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|a volume
|b nc
|2 rdacarrier
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| 502 |
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|b Ph. D.
|c Texas A&M University
|d 2003
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| 504 |
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|a Includes bibliographical references (leaves 215-222).
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| 500 |
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|a Vita.
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| 500 |
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|a "Major Subject: Mechanical Engineering".
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| 530 |
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|a Issued also on microfiche from University Microfilm Inc.
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| 520 |
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|a The DeNOx process (SNCR of NOx by NH₃) was investigated experimentally and numerically. The experiments were conducted by using simulated exhaust gases in a well-defined laminar reactor facility over the temperature range from 850 K to 1350 K (Chapter V). Established chemical kinetic programs were utilized for the model calculations, including sensitivity analysis to identify the reaction pathways (Chapter VI). When the β-ratio (the molar ratio of NH₃ to NOx) was greater than about 1.5, more than 80% of NOx could be removed (Chapter VII). The existing model for the experimental system was improved in two major ways. First, the radial velocity profile was included as opposed to the use of a constant velocity (plug flow). Second, the gas temperatures before and after the center region of the reactor were included. These two improvements resulted in closer agreements with the experiments than the calculations limited to only the major reacting zone (Chapter VIII). For the base conditions of 670-ppm NH₃, 325-ppm NO, and 10-ppm of NO₂, the NOx removals were determined as functions of the residence time (up to 1527.8/T sec) and the initial levels of O₂ (up to 15.0%), CO (up to 1260 ppm), and H₂O. The maximum NOx removals occurred at lower temperatures with the increase of the residence time, O₂ levels, and CO levels, while the effects of H₂O (up to about 8%) were insignificant on the NOx removals. In general, the maximum NOx removals were above about 80% at around 1200±150 K for the current conditions (Chapter IX). The decrease of T[DeNOx] (the temperature for the maximum NOx removals) due to the increase of the residence time and the O₂ levels could be related to simple exponential (logarithmic) functions, while the increase of CO resulted in the linear deductions of T[DeNOx] (Chapter X). Compared to the experiments, the predictions from the currently utilized DeNOx mechanisms showed significant discrepancies for T[DeNOx] and the formed concentrations of N₂O at certain conditions (especially, for the given O₂ levels). Possible weaknesses of the current mechanisms were suggested with the identified NOx removal pathways through sensitivity analysis (Chapter XI).
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| 500 |
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|a In title subscripts are used.
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| 650 |
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4 |
|a Major mechanical engineering.
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| 856 |
4 |
1 |
|u http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=765867071&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD
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| 948 |
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|a cataloged
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|c 2004/3/9
|d c
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| 994 |
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|a E0
|b TXA
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| 952 |
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|a Texas A&M University
|b College Station
|c Cushing Memorial Library & Archives
|s cush tdrm
|d Cushing: Theses & Dissertations Microforms (Does not check out)
|t 0
|e 2003 Dissertation B325
|h Other scheme
|i unmediated -- volume
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| 952 |
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|a Texas A&M University
|b College Station
|c Electronic Resources
|s www_evans
|d Available Online
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|e 2003 Dissertation B325
|h Other scheme
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| 998 |
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|a 2003 Dissertation B325
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|l Cushing: Theses & Dissertations Microforms (Does not check out)
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| 998 |
f |
f |
|a 2003 Dissertation B325
|t 0
|l Available Online
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