Filters
Results 1 - 1 of 1
Results 1 - 1 of 1.
Search took: 0.019 seconds
AbstractAbstract
[en] The mechanism by which the burden moves in a submerged-arc furnace was investigated in two large industrial furnaces by the stimulus-response technique with a radiotracer of the radio-isotope 5 Fe as the stimulus. As this radio-isotope was suitable only for the measurement of residence-time distributions in the alloy phase, the analysis of the experiments was limited to that phase. The residence-time distributions obtained by the measurement of alloy samples obtained during tapping were analysed by various techniques. This analysis verified the existence of stagnant zones within the furnace, and showed that the movement of the burden through the furnace could not be described by either of the two idealized patterns of flow, i.e., plug flow or mixed flow. A composite model to describe the movement of the burden through the furnace was developed by consideration of the mechanism and position of heat generation within the furnace, the inner structure of the furnace, the general form of the measured residence-time distributions, and the mode of burden descent through the furnace. The composite model consisted of a dispersed plug-flow region in the upper regions of the furnace discharging into a constantly stirred tank reactor beneath the electrode tips. Non-linear regression analysis of the equations developed from the composite model permitted the selection of optimum values of model parameters to give computed curves that approximated to the residence-time distributions
[af]
Die meganisme waardeur die lading in 'n dompelboogoond beweeg, is in twee groot industriele oonde ondersoek met behulp van die stimulus-reaksietegniek met 'n radiospoorder van die radioisotoop 5 Fe as stimulus. Aangesien hierdie radioisotoop slegs geskik is vir die meet van verblyftydverdelings in die legeringsfase, is die ontleding van die eksperimente tot daardie fase beperk. Die verblyftydverdelings wat verkry is deur monsters van die legering wat tydens die tapping geneem is, te meet, is volgens verskillende tegnieke ontleed. Hierdie ontleding het die bestaan van trae sones in die oond bevestig en het getoon dat die beweging van die lading deur die oond nie deur een van die twee geidealiseerde vloeipatrone, d.w.s. die propvloei of gemengde vloei beskryf kan word nie. Daar is 'n saamgestelde model om die beweging van die lading deur die oond te beskryf, ontwikkel aan die hand van die meganisme en posisie van die hitteontwikkeling in die oond, die binnestruktuur van die oond, die algemene vorm van die gemete verblyftydverdelings en die wyse waarop die lading deur die oond daal. Die saamgestelde model het bestaan uit 'n gedispergeerde-propvloeistreek in die boonste dele van die oond wat uitloop in 'n tenkreaktor wat voortdurend geroer word, onder die elektrodepunte. Nie-lineere regressieontleding van die vergelykings wat aan die hand van die saamgestelde model ontwikkel is, het dit moontlik gemaak om optimum waardes van modelparameters te kies om berekende krommes te gee wat by benadering die verblyftydverdelings geePrimary Subject
Source
12 Jun 1978; 35 p; ISBN 0 86999 440 9; 

Record Type
Report
Report Number
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue