The SCOPE-Jet Swing developed by Taiyo Nippon Sanso Corporation (TNSC) adds a swing function to the energy-saving supersonic oxygen (O2) jet SCOPE-Jet by applying the self-induced oscillation phenomenon of fluids.

O2 burners rapidly entered widespread use in the electric arc furnace (EAF) steelmaking processes in the 1960s and now are installed and used in many EAFs. The function of O2 burners in EAF is to promote melting by applying heat to the cold spots within the furnace and they are used mainly during the melting stage to melt solid iron scrap.

In recent years, proposals have been made to use burner lances that form flames of O2 gas blown at supersonic speeds, significantly suppressing the attenuation of the speed and concentration of O2 gas. Using these burner lances enables omitting direct application of O2 on molten steel as had conventionally been performed using exhaust-type lances during refining, and they have made EAF operations efficient.

TNSC developed the SCOPE-Jet high-speed O2 lance for the EAF steelmaking process in 2001. In December 2017, the company developed a new type of SCOPE-Jet with enhanced performance that also supports low pressure, low-calorie fuels.

Technical overview

Self-induced oscillation is a technology that uses a fluid phenomenon known as the Coandă effect, in which a fluid ejected from a nozzle flows along a nearby wall surface. TNSC has already commercialised O2 combustion technologies using self-induced oscillation (Innova-Jet Swing and Innova-Jet F.H.). SCOPE-Jet Swing features a nozzle that forms a supersonic O2 jet with a construction that generates self-induced oscillation. This has made it possible to swing the supersonic O2 jet without a mechanical drive section.

The conventional SCOPE-Jet is excellent for localised melting and refining, while the SCOPE-Jet Swing allows melting over a wide area and is expected to be effective for eliminating cold spots near the working opening of an EAF.

Future developments

TNSC has developed the SCOPE-Jet and Innova-Jet series for the EAF steelmaking process, and these have achieved productivity increases and energy savings. With the addition of the SCOPE-Jet Swing, TNSC expects to achieve further productivity improvements in the EAF steelmaking process. Furthermore, TNSC will develop more applications for this unique fuel combustion technology capable of swinging a supersonic O2 jet, mainly in the field of steelmaking.