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Tetsu-to-Hagané
Vol. 53 (1967), No. 9

Tetsu-to-Hagané Vol. 53 (1967), No. 9

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ONLINE ISSN:	1883-2954
PRINT ISSN:	0021-1575
Publisher:	The Iron and Steel Institute of Japan

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Keyword Ranking

21 Nov. (Last 30 Days)

Tetsu-to-Hagané Vol. 53 (1967), No. 9

研究は人なり

河田和美

pp. 1079-1080

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研究は人なり

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Consideration on Oil Replacement Coefficient in Blast Furnace Operation

Fumitada NAKATANI, Yoshihiko SUNAMI, Fumio NAKAMURA

pp. 1081-1094

Abstract

There are many reports on heavy oil replacement coefficient in the blast furnace operation. But in most cases the replacement coefficients have been calculated by the following equation:
Replacement coefficient R= (Standard coke rate)-(coke rate with oil injection)/Oil rate
However the use of this equation for the theoretical study involves many problems because of the various factors in the blast furnace operation.
In this report, we outlined our theoretical study on the oil replacement coefficient and proposed a new method of calculation based on carbon balance in the previous report.
(1) We discussed the heavy oil replacement coefficient R, when top gas ratio γ= (CO/CO₂) and utilization coefficient of hydrogen γ₁, did not change before and after the commencement of oil injection.
The following equation was deduced:
R= 6Bη(1+γ) x+A
Where A: carbon fraction in heavy oil, B: hydrogen fraction in heavy oil, x=O_a/O_b, O_a: proportion of oxygen removed by CO before oil injection in the oxygen reduced by hydrogen from oil during oil injection. O_b: amount of oxygen removed by hydrogen from oil.(x is always between 0 and 1)
(i) When the heat absorption by oil injection is completely compensated by elevating the blast temperature etc.(when there is no change in the total direct reduction rate caused by oil injection).
x=1, ∴R= 6Bη(1+γ) +A
In this case R takes the maximum value.
(ii) When the heat absorption by oil injection is not completely compensated (when direct reduction rate decreases during oil injection),
x<1 ∴R= 6Bη(1+γ) x+A
In the special case when hydrogen produced from heavy oil reacts only with the oxygen that has been removed by direct reduction before oil injection.
x=0 ∴ R= A
In this case R takes the minimum value.
(2) Relations between oil rate Y and R are as follows. Let Y_L be the maximum quantity of oil that can be injected without any change in direct reduction rate.
(i) Y≤Y_L, R= 6Bη(1+γ) +A
(ii) Y>Y_L
R= 6Bη(1+γ)α+A+6Bη(1+γ)(1-α) Y_L/Y
where α: factor depending on thermal balance.
These relations show that the heat compensation is very important to gain high oil replacement coefficient.
(3) Examples of applying the new method of calculation.
(i) When the blast temperature is increased from 900°C to 1000°C for heat compensation. The following are gained:
When Y≤12⋅8 (kg/t) R= 1⋅535
whenY>12⋅8 R= 1⋅035+6⋅170/Y
(ii) The oil replacement coefficients for Kokura No.1 and No.2 blast furnace were calculated as follows:
R: 1⋅32-1⋅59 (No.1 B.F.) R: 1⋅35-1⋅63 (No.2 B.F.)

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Consideration on Oil Replacement Coefficient in Blast Furnace Operation

Bibtex

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Review on the Methods of Chemical Analysis for Iron and Steel

Shigeo WAKAMATSU

pp. 1095-1118

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Review on the Methods of Chemical Analysis for Iron and Steel

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Memoirs of Manufacturing Technology of Armor Plate

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Tetsu-to-Hagané Vol. 53 (1967), No. 9

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reduction caco3 in electric furnace

kinetics of decarburization of liquid iron with high concentration ofcarbon

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foamy slag in eaf

kinetics of decarburization of liquid iron by

ladle furnace flicker

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Tetsu-to-Hagané Vol. 53 (1967), No. 9

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Consideration on Oil Replacement Coefficient in Blast Furnace Operation

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Review on the Methods of Chemical Analysis for Iron and Steel

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Memoirs of Manufacturing Technology of Armor Plate

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The Swedish Steel Industry

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Article Access Ranking

In-situ Observation of Precipitation and Growth of MnS Inclusions during Solidification of a High Sulfur Steel

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SOKD: A soft optimization knowledge distillation scheme for surface defects identification of hot-rolled strip

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Injection of hydrogenous gases into the blast furnace tuyeres for reducing CO₂ emissions: a review

Precipitation Behavior of MnS from Molten Iron to Al₂O₃ during Solidification

Molecular dynamics simulation of viscosity of the CaO, MgO and Al₂O₃ melts