Dependence of flame front speed on iron ore sintering conditions

Abstract

It is well established that flame front speed is an important factor influencing sinter productivity, sinter quality and fuel rate. In this work, the effect of suction, coke addition and mix moisture on flame front speed was studied in a pilot-scale sinter pot and also using a recently developed theoretical model. Airflow through the bed has a large influence on flame front speed. It was found that increasing sintering airflow rate will lead to increased flame front speed, but the increases become smaller at higher airflow rates. Sinter pot test results showed that increasing coke addition decreased green bed permeability and increased flame front temperature, which resulted in increased flame front resistance and decreased flame front speed. Studies also showed that green bed properties are sensitive to sinter mix moisture level. The changes in green bed properties further influence the flame front properties.

Keywords

Flame front speed Suction Coke addition Mix moisture

Get full access to this article

View all access options for this article.

References

Cumming,

M. J.

and Thurlby,

J. A.

1990. Developments in modelling and simulation of iron ore sintering. Ironmaking & Steelmaking, 17, (4), pp.245–254.

Debrincat,

and Loo,

C. E.

2007. Factors influencing particulate emissions during iron ore sintering. ISIJ International, 47, (5), pp.652–8. doi: 10.2355/isijinternational.47.652

Ellis,

, Loo,

C. E.

and Witchard,

2007. Effect of ore properties on sinter bed permeability and strength. Ironmaking & Steelmaking, 34, (2), pp.99–108. doi: 10.1179/174328107X165726

Grice,

M. A. K.

and Davies,

1953. Towards faster sintering of ironstone. The Journal of Iron and Steel Institute, 175, (2), pp.155–60.

Loo,

C. E.

and Hutchens,

M. F.

2003. Quantifying the resistance to airflow during iron ore sintering. ISIJ International, 43, (5), pp.630–6. doi: 10.2355/isijinternational.43.630

Patankar,

S. V.

1980. Numerical heat transfer and fluid flow. Washington: Hemisphere Publishing Corporation.

Patisson,

, Bellot,

J. P.

, Ablitzer,

, Marliere,

, Dulcy,

and Steiler,

J. M.

1991. Mathematical modeling of iron ore sintering process. Ironmaking & Steelmaking, 18, (2), pp.89–95.

Zhao,

J. P.

, Loo,

C. E.

and Dukino,

R. D.

2015. Modelling fuel combustion in iron ore sintering. Combustion and Flame, 162, (4), pp.1019–34. doi: 10.1016/j.combustflame.2014.09.026

Zhou,

, Zhao,

J. P.

, Loo,

C. E.

, Ellis,

B. G.

and Cen,

K. F.

2012a. Model predictions of important bed and gas properties during iron ore sintering. ISIJ International, 52, (12), pp.2168–76. doi: 10.2355/isijinternational.52.2168

10.

Zhou,

, Zhao,

J. P.

, Loo,

C. E.

, Ellis,

B. G.

and Cen,

K. F.

2012b. Numerical modeling of the iron ore sintering process. ISIJ International, 52, (9), pp.1550–8. doi: 10.2355/isijinternational.52.1550