March 8, 2021
Notice Regarding Development of High-Efficiency Oxygen Utilization Systemfor Electric Arc Furnace Steelmaking Linked to Laser Gas Analyzers

Taiyo Nippon Sanso Corporation (“TNSC”) hereby announces that it has combined oxygen
applications for electric arc furnace steelmaking processes with laser gas analyzers, and developed
technology to improve oxygen utilization efficiency in electric arc furnace steelmaking.
1. Background to Product Development
Oxygen applications, such as oxygen burners and lances, are often installed and used in electricarc furnaces for the purpose of improved productivity and energy savings in electric arc furnacesteelmaking processes.
TNSC has used SCOPE-Jet®, a high-speed oxygen burner lance, in electric arc furnacesteelmaking processes since 2001. In 2017, TNSC developed a new type of SCOPE-Jet® withfurther enhanced performance that also supports low-pressure, low-calorie fuels (announced inthe December 25, 2017 news release).
For technology that reduces power consumption even further, TNSC is also developing “SCOPEJet® Post Combustion”, which effectively utilizes thermal loss of the emissions that account forapproximately 30% of electric arc furnace heat. “SCOPE-Jet® Post Combustion” achieves energy
savings by conducting secondary combustion of unburnt gases within the electric arc furnace andheating scrap material.
TNSC has recently launched optimized oxygen injection technology linked to oxygen
applications and laser gas analyzers with the expertise it has cultivated so far through the electricarc furnace steelmaking process to address market demand for cost reductions driven by therecent rise in electricity charges and secondary material costs and to improve the efficiency ofoxygen applications. This has reduced oxygen consumption by approximately 20% compared tothe conventional operation using “SCOPE-Jet® Post Combustion”.
2. Technical Overview
Post combustion involves enriching unburnt gases (such as CO and H 2) generated from raw
material scrap, carbon material, and fuel within the electric arc furnace during melting in electricarc furnace steelmaking processes with pure oxygen from oxygen lances installed in the furnace
walls. This helps to achieve combustion, preheat the scrap, reduce power consumption andimprove productivity. Since the composition of unburnt gases that are generated changes by thesecond, it is necessary to accurately assess the composition of emissions and appropriately control
the volume of oxygen supplied.
By analyzing the composition of emissions generated by the electric arc furnace and its
operational patterns and conducting numerical analysis of the flow of gas within its exhaust duct,
TNSC has optimized the position for measuring emissions.

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The laser gas analyzers handled by TNSC to measure emissions utilize TDLAS (Tunable DiodeLaser Absorption Spectroscopy) and produce continuous and instant measurements (responsespeed: ~2 seconds) of CO, CO 2, and H2O components as well as temperature using a single laser.
(Chart 1)
In addition, TNSC has newly developed a system for controlling the volume of oxygen flow toallow the optimal volume of oxygen to be supplied in relation to changes in the concentration of
the composition of emissions. (Fig. 1, Fig. 2)
In comparison to the conventional operation, this has eliminated the need to inject excess oxygenand has made it possible to reduce oxygen consumption. This technology can be linked with otherapplications used in electric arc furnace steelmaking processes (such as oxygen burners, foundry
lances, and carbon injection) and allows for the following controls based on the composition andtemperature of emissions.
・Reduces costs by controlling the volume and timing of oxygen, fuel, and carbon injections
・Reduces power consumption by controlling the volume of air expressed from the exhaust fan・Prevents accidents through early detection of water leaks

Fig. 1 SCOPE-Jet® SCAN system Overview

2Fig. 2 SCOPE-Jet® SCAN controls the volume of oxygen flow
Chart 1 SCOPE-JetⓇ SCAN Specifications
Measuredcomponent

RangePrecisionCO[%]

2 ～ 80±2%absCO2[%]

2 ～ 80±1%abs

H2 O[%]

1 ～ 50±1%abs

Temperature[℃]

260～1700±1.5%FS

3. Future Plans
TNSC previously developed the SCOPE-Jet® and Innova-Jet® series for electric arc furnacesteelmaking processes, achieving increased productivity and energy savings. In the future, inorder to improve oxygen utilization efficiency, oxygen burner lances and carbon injection will beintegrated into SCOPE-JetⓇ SCAN, which incorporates laser gas analyzers. TNSC expects thatthis will achieve further operation improvements in electric arc furnace steelmaking processes,
which produce fewer carbon emissions in crude steel production than blast furnaces.
TNSC also aims to use this application that incorporates laser gas analyzers in heating furnaceand converter processes, mainly in the steelmaking field.

Taiyo Nippon Sanso CorporationTnsc.Info@tn-sanso.co.jp

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