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鉄と鋼
Vol. 53 (1967), No. 9

鉄と鋼 Vol. 53 (1967), No. 9

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オンライン版ISSN:	1883-2954
冊子版ISSN:	0021-1575
発行機関:	The Iron and Steel Institute of Japan

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キーワードランキング

21 Dec. (Last 30 Days)

鉄と鋼 Vol. 53 (1967), No. 9

研究は人なり

河田和美

pp. 1079-1080

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Consideration on Oil Replacement Coefficient in Blast Furnace Operation

Fumitada NAKATANI, Yoshihiko SUNAMI, Fumio NAKAMURA

pp. 1081-1094

抄録

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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Review on the Methods of Chemical Analysis for Iron and Steel

Shigeo WAKAMATSU

pp. 1095-1118

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Memoirs of Manufacturing Technology of Armor Plate

Kiyoshi SASAGAWA

pp. 1119-1129

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随想

鉄と鋼 Vol.64(1978), No.8

Re-oxidation Behaviors of Sponge-Irons Reduced from Ferric Oxide and Iron-Ores

鉄と鋼 Vol.56(1970), No.5

On Mechanism of Formation of Negative Segregation Zone (alias ‘Settling Crystal Zone’) in Large Steel Ingot and Origin of (Macroscopic Oxide) Inclusions Appeared in This Zone

鉄と鋼 Vol.53(1967), No.13

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The Swedish Steel Industry

H. DAHLERUS

pp. 1130-1140

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The Future Movement and Effect of Technical Development of Japan Iron and Steel Industry

Yoshihiro INAYAMA

pp. 1141-1143

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Vision of Steel Making Technology

Masakazu HIRASE

pp. 1144-1146

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抄録

pp. 1147-1151

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論文アクセスランキング

21 Dec. (Last 30 Days)

Wettability of CaS against molten iron at 1873 K

ISIJ International 早期公開
凝固過程における溶鋼中からAl₂O₃上へのMnSの晶出挙動

鉄と鋼早期公開
Reduction and Melting Behaviors of Iron Oxide Composite with Carbon Deposited Using CO-CO₂-H₂ Mixed Gas

ISIJ International 早期公開
In-situ Observation of Precipitation and Growth of MnS Inclusions during Solidification of a High Sulfur Steel

ISIJ International Vol.64(2024), No.14
Perspectives on the Promising Pathways to Zero Carbon Emissions in the Steel Industry toward 2050

ISIJ International 早期公開
モデル材料を用いた凝固過程における介在物生成挙動のその場観察

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Transition behavior of gas containing suspension from solid-like to liquid-like flows

ISIJ International 早期公開
A hot rolling full process rolling force prediction method based on transfer learning and Inception-LSTM neural network

ISIJ International 早期公開
Slag-steel reactions in the refining of Advanced High-Strength Steel

ISIJ International 早期公開
Chemical and Mechanical Factors on Phosphorus Dissolution Behavior from P-concentrated Slag

ISIJ International Vol.64(2024), No.14

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鉄と鋼 Vol. 53 (1967), No. 9

キーワードランキング

hydrogen reduction of iron ore

gasification

characterization of coal and biomass based on kinetic parameter distributions for pyrolysis

kinetics of decarburization of liquid iron with high concentration ofcarbon

mechanisms of liquefaction and pyrolysis reaction of biomass

hydrogen reduction

steel

19al6mg

automotive wheel

deguchi

鉄と鋼 Vol. 53 (1967), No. 9

研究は人なり

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Consideration on Oil Replacement Coefficient in Blast Furnace Operation

SNSによる共有

Review on the Methods of Chemical Analysis for Iron and Steel

SNSによる共有

Memoirs of Manufacturing Technology of Armor Plate

SNSによる共有

The Swedish Steel Industry

SNSによる共有

The Future Movement and Effect of Technical Development of Japan Iron and Steel Industry

SNSによる共有

Vision of Steel Making Technology

SNSによる共有

抄録

SNSによる共有

論文アクセスランキング

Wettability of CaS against molten iron at 1873 K

凝固過程における溶鋼中からAl2O3上へのMnSの晶出挙動

Reduction and Melting Behaviors of Iron Oxide Composite with Carbon Deposited Using CO-CO2-H2 Mixed Gas

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

Perspectives on the Promising Pathways to Zero Carbon Emissions in the Steel Industry toward 2050

モデル材料を用いた凝固過程における介在物生成挙動のその場観察

Transition behavior of gas containing suspension from solid-like to liquid-like flows

A hot rolling full process rolling force prediction method based on transfer learning and Inception-LSTM neural network

Slag-steel reactions in the refining of Advanced High-Strength Steel

Chemical and Mechanical Factors on Phosphorus Dissolution Behavior from P-concentrated Slag

詳細検索

凝固過程における溶鋼中からAl₂O₃上へのMnSの晶出挙動

Reduction and Melting Behaviors of Iron Oxide Composite with Carbon Deposited Using CO-CO₂-H₂ Mixed Gas