Bottom stirring tuyere and method for a basic oxygen furnace

US10781499B2 · kind B2 · utility

Assignee

• AIR PRODUCTS AND CHEMICALS, INC. · US

Inventors

• Gregory J. Buragino · Macungie, US
• Shailesh Pradeep Gangoli · Easton, US
• Anshu Gupta · Vlaardingen, NL
• Anup Vasant Sane · Allentown, US
• Avishek Guha · Emmaus, US
• Xiaoyi He · Orefield, US
• Michael David Buzinski · Slatington, US
• Kyle J. Niemkiewicz · Coopersburg, US
• Russell James Hewertson · Wescosville, US

Key dates

• Filing date: Jan 17, 2018
• Grant date: Sep 22, 2020
• Expiry date: Jul 14, 2038

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F27D2099/0036
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method of operating a BOF bottom stir tuyere having an inner nozzle surrounded by an annular nozzle, including during a hot metal pour phase and a blow phase, flowing an inert gas through both nozzles; during a tap phase, initiating a flow of a first reactant through the inner nozzle and a flow of a second reactant through the annular nozzle, and ceasing the flow of inert gas through the nozzles, wherein the first and second reactants includes fuel and oxidant, respectively, or vice-versa, such that a flame forms as the fuel and oxidant exit the tuyere; during a slag splash phase, continuing the flows of fuel and oxidant to maintain the flame; and after ending the slag splash phase and commencement of another hot metal pour phase, initiating a flow of inert gas through both nozzles and ceasing the flows of the first and second reactants.