Factors affecting fuel rate in Corex process

Kumar, P. Prachethan; Gupta, Dharmendra K.; Naha, T. K.; Gupta, Samarth

doi:10.1179/174328106x101493

Cited by 49 publications

(37 citation statements)

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“…It can be seen from an Audibert-Arnu dilatometer test in Table 2 that both of the coals display contraction trend during heat treatment, with the value of 29% and 4% for XLC and DLC compared with their parent coal volume, respectively. The coal particle size was selected between +20 and −30 mm, which is regarded as the optimum mean grain size of coal in the Corex process [29]. Coal sample was dried by heating in a muffle furnace at 120°C for 2 h to remove the moisture.…”

Section: Coal Sample Preparationmentioning

confidence: 99%

Structure characterization and metallurgical properties of the chars formed by devolatilization of lump coals

Zhang

Peng

Zhang

et al. 2015

Fuel Processing Technology

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Section: Coal Sample Preparationmentioning

confidence: 99%

Structure characterization and metallurgical properties of the chars formed by devolatilization of lump coals

Zhang

Peng

Zhang

et al. 2015

Fuel Processing Technology

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“…For every 10% drop in metallisation, the fuel rate increases by 10 kg thm -1 . 4 1 Influence of CCS on production 2 Influence of RDI on production 3 Influence of RDI on gas differential pressure in the shaft Iron ore fines or sinter fines are added directly into the melter-gasifier for cooling whenever dome temperature rises above 1050uC. Iron ore fines less than 10 mm and sinter fines less than 8 mm are used.…”

Section: Properties Of Iron-bearing Materials Required For Corexmentioning

confidence: 99%

Raw materials for Corex and their influence on furnace performance

Kumar¹,

Barman²,

Reddy³

et al. 2009

Ironmaking & Steelmaking

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The scarcity of good quality coking coal for the blast furnace (BF) has made steel makers look for an alternative iron-making process that requires little or no coke. The Corex process has been developed as an alternative to BF iron-making, which uses non-coking coal and a small amount of coke as fuel, and pellet/lump ore as iron-bearing feed. JSW Steel operates two Corex units each of 0?8 Mtpa, commissioned in 1998 and 2001 respectively. Iron oxides and non-coking coals have to meet certain physical, chemical and high temperature properties for stable operation and to attain high performance levels. Experience of the Corex operation with various coals and iron oxides over the years has helped in understanding the influence and sensitivity of raw materials on its performance and develop new raw material specifications. Statistical analysis of plant data showed that the significant parameters affecting fuel rate and production are moisture, volatile matter, char strength after reaction of coal, reduction disintegration index (RDI; %, -6?3 mm) of pellets and slag rate. This helped achieve the most efficient operating parameters, surpass rated capacity and utilise steel plant waste. The present paper brings out the impact of various raw material properties, and the modified specifications of coal and iron oxides for Corex.

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“…The major parameters affecting the fuel rate in Corex process are moisture in the coal blend, volatile matter (VM) in the coal blend, coal char strength after reaction (CSR), 2 coal fines, metallisation, alumina in slag, production and slag rate, etc. 2 The lower the CSR of the coal, the greater the coal fines generation and also the earlier the consumption of carbon in coal (compared to coke) in the gasifier, hence the chances of the fines and the residual ash getting entrapped by slag downpour will be increased. Low CSR coals demand high coke for a stable performance of the furnace.…”

Section: Factors Responsible For Silicon Content In Corex Hm and Its mentioning

confidence: 99%

Influence of operational parameters on silicon in hot metal from Corex

Kumar¹,

Dasu²,

Ranjan³

et al. 2008

Ironmaking & Steelmaking

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Quality steel production at low cost demands superior quality of hot metal (HM) with low silicon (Si) and sulphur. High silicon is undesirable for its subsequent treatment during steelmaking, making the process costlier and less productive, hence there have been constant efforts to lower the silicon content in HM. Corex is the only commercially established and proven smelting reduction ironmaking technology alterative to conventional blast furnace (BF) ironmaking. While the mechanism of silicon transfer is largely understood in the BF, the Corex process still requires further operational guidance for its control. A statistical analysis of more than one year plant data has been carried out to understand the parameters influencing the silicon content and to provide directions for its prediction and control. Based on the understanding of the parameters affecting the silicon in HM, regression analysis was carried out and equations have been developed to predict the silicon in Corex HM. The present paper discusses the various parameters involved, the regression output for silicon prediction, its validation and its interrelation with operating parameters. The analysis indicates that high fuel rates due to high moisture, poor metallisation, high volatile matter, high slag volume, high coal fines and low production, along with high basicity and alumina in slag lead to high silicon in HM.

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Factors affecting fuel rate in Corex process

Cited by 49 publications

References 0 publications

Structure characterization and metallurgical properties of the chars formed by devolatilization of lump coals

Structure characterization and metallurgical properties of the chars formed by devolatilization of lump coals

Raw materials for Corex and their influence on furnace performance

Influence of operational parameters on silicon in hot metal from Corex

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