Source:JASE-W Japanese Smart Energy Products & Technologies

https://www.jase-w.eccj.or.jp/technologies/index.html

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Keywords

Y3

equipment or facility

Z3

natural gas

S4

FEMS

DConstruction

NIPPON STEEL ENGINEERING CO., LTD.

Direct Reduced Iron (DRI) Production Plant
Featuresu A direct reduced iron (DRI) production plant is a shaft reduction furnace to produce DRI with large
metal iron content by directly reducing iron ore (or iron ore pellets) with reducing gases.
u While the produced DRI is mainly used as the raw material of electric steelmaking, it is also used as
blast furnace feed for energy saving (reduction in coke consumption) and increased production ofmolten iron at integrated blast furnace steelworks.
u A wide variety of gases including by-product gases generated in integrated blast furnace steelworks
and coal gas refined in coal gasifiers, as well as widely-used natural gas, may be used as reducinggases.
u NSENGI, Tenova-HYL and Danieli concluded a strategic alliance agreement for the joint developmentof DRI steel production plant and expansion of the market of DRI in September 2013.

Basic Concept or Summary

Direct Reduced Iron (DRI) Production Plant

Effects or Remarks
1. Energy saving (reduction in consumption of coal in blast furnaces)
The use of DRI as blast furnace feed enables reduction in coal consumption in blast furnaces.
(When 100 kg of DRI is used for the production of 1 ton of molten iron, the consumption of coal in blast
furnaces will be reduced by 50 - 60 kg.)
2. Reduction in CO2 emission
The reduction in the consumption of coal by charging DRI to blast furnaces enables reduction in CO2emission from steelworks.
(When 100 kg of DRI is used for the production of 1 ton of molten iron, CO2 emission (including thatfrom the DRI production plant) will be reduced by 50 - 100 kg.)
3. Increase in the productivity of blast furnaces
The productivity of a blast furnace increased with charging DRI with large metallic iron content to it.
(When 100 kg of DRI is used for the production of 1 ton of molten iron, the production of molten ironincreases by 10 - 15 %.)4. Reduction in the facility renovation cost
The reduction in coal consumption in blast furnaces enables reduction in the repair cost of coke ovens.
Reduction in the number and volume of blast furnaces with the increase in the productivity enables
reduction in the repair cost of blast furnaces.
5. Improvement of ventilation in blast furnaces
Charging of DRI to blast furnaces improves the ventilation in them and the improved ventilation leads
to stable operation of blast furnaces.
6. Production of High-C DRI
The use of in-situ reforming, or direct use of CH4 in the reducing gas, enables production of DRI withhigh carbon content, High-C DRI. It is easy to handle High-C DRI because it is not easily re-oxidized.
It also has the advantages mentioned below.
・High-C DRI is highly reactive as blast furnace feed because the carbon in DRI facilitates reductionof residual FeO.
・The use of High-C DRI in electric steelmaking reduces the electric power consumption rate as thecarbon contained in DRI becomes an energy source.
7. No sulfur content restriction on raw materials and reducing gases
The use of the in-situ reforming makes the sulfur content restriction irrelevant and makes it possible touse a wide variety of raw materials and reducing gases.

Installation in Practice or Schedule
Domestic
Overseas<Plants for electric steelmaking (orders received in recent years)>
・Welspun Maxsteel (India)
・Emirate steel, Gulf sponge iron (UAE)・Suez Steel (Egypt)・Nucor (USA)・JSPL (India), etc.
<Plants for blast furnace mills>
・A feasibility study in progress at a blast furnace mill overseas

Contact:

NIPPON STEEL ENGINEERING CO., LTD.,
Plant & Machinery Sector
Osaki Center Building, 1-5-1, Osaki, Shinagawa-ku, Tokyo 141-8604 Japan
Tel: +81-3-6665-2000 Fax: +81-3-6665-4847

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