Thesis (MBA)--Stellenbosch University, 2000. / ENGLISH ABSTRACT: It was found that the hot metal cost of ISCOR Newcastle's single blast furnace can
significantly be reduced by the correct use of an integrated model to predict reductant cost
based mainly on coal blend. The model uses coal ash chemistry, fluiidity, vitrinite rank and
volatile matter to predict coke strength after reaction (CSR), coke ash and coking yield.
CSR is used to predict maximum allowable coke nut- and pea consumption in the furnace as
well as hot blast temperature. Pitch injection levels are predicted using CSR and blast furnace
production rates. Coke ash, pitch injection and hot blast temperature is used to predict the
coke rate.
The above is used with imported Chinese coke cost to accurately predict reductant cost. It
was found that the current optimum blends should include Australian en Nieu Zeeland coals
because of price and quality conciderations. Because of its low cost of production and low
quality the optimum percentage of Grootegeluk in the blend is determined largely by its
transfer price. / AFRIKAANSE OPSOMMING: Die vloeiyster koste van ISCOR Newcastle se enigste hoogoond kan drasties verlaag word
deur die korrekte gebruik van 'n geïntegreerde model wat reduktant koste voorspel op grond
van steenkoolmengsel. Die model gebruik die chemiese samestelling van steenkool-as,
fluiiditeit, vitriniet rang en vlugstof om kooks warmsterkte (SNR), kooks-as en
verkooksingsopbrengs te voorspel.
SNR is gebruik om die maksimum kooksneute- en -erteverbruik in die hoogoond sowel as
blaastemperatuur te voorspel. Pikinspuiting is bereken met SNR en hoogoond
produksietempo's. Pikinspuiting en blaastemperatuur word saam met kooks-as gebruik om
kookskoers te voorspel.
Bogenoemde is saam met die koste van ingevoerde Chinese kooks gebruik om reduktant
koste akkuraat te voorspel. Daar was bevind dat die huidige optimum mengsels Australiese
en Nieu Zeelandse steenkool moet bevat as gevolg van huidige prys- en kwaliteitsoorwegings.
As gevolg van sy lae produksiekoste en lae kwaliteit word die optimum hoeveelheid
Grootegeluk bepaal deur sy oordragprys.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/51865 |
| Date | 03 1900 |
| Creators | Skinner, William |
| Contributors | Gevers, W., Stellenbosch University. Faculty of Economic & Management Sciences. Graduate School of Business. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | af_ZA |
| Detected Language | English |
| Type | Thesis |
| Format | 47 p. : ill. |
| Rights | Stellenbosch University |
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