Regular Article

Research on coherent jet oxygen lance in BOF steelmaking process

¹ School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Pr China
² Research Center of Metallurgical Engineering & Technology of Shaanxi Province, Xi’an University of Architecture and Technology, Xi’an 710055, Pr China
³ School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, Pr China

^* e-mail: lvmingsteel@163.com

Received: 18 September 2018
Accepted: 22 March 2019

Abstract

The properties of conventional supersonic oxygen jet and coherent jet were simulated by Fluent in this paper. Their velocity field and jet radius were analyzed comparatively. The attenuation of gas jet was slowed down by the coherent jet oxygen lance. Besides, the effects of annular flow rate on the central oxygen jet velocity were also researched. It is showed that the core of the jet is gradually prolonged with the increase of annular gas flow rate. Based on the simulations, the designed coherent jet oxygen lance was experimented in 35 ton converter. It is found that the end-point phosphorus content is decreased from 0.024 to 0.016%, and dephosphorization rate is increased significantly, the average consumption of steel material is reduced by 3.4 kg/t, and iron-loss of slag is also reduced, which is favorable to improve oxygen utilization and metallic yield. This research provides good foundation for coherent jet technology promotion and application in Basic Oxygen Furnace (BOF).