Single-runner dual-structure oxygen lance spraying head and blowing technology

Abstract

The invention relates to a single-runner dual-structure oxygen lance spraying head which comprises an oxygen inlet, laval pipe main holes and laval pipe auxiliary holes. The laval pipe main holes andthe laval pipe auxiliary holes are arranged alternatively; and the single-runner dual-structure oxygen lance spraying head is characterized in that the laval pipe main holes are small in flare angle and large in hole diameter, and the laval pipe auxiliary holes are large in flare angle and small in hole diameter. In the blowing process, the main hole jet flow strength is improved, the impact effect and the stirring strength of spraying head jet flows to a molten bath are strengthened, and the main hole spraying head jet flow core zone distance is lengthened. Auxiliary hole jet flows effectively buffer the main hole jet flow damping, the molten bath area is obviously increased, and the slugging effect is obvious; and the fusion distance of all jet flows in the furnace is obviously increased, the coverage possibility is greatly reduced, the splash rate is obviously reduced under the main and auxiliary hole coordinated work, gaps between columns are increased, the cooling water flow is better increased, the spraying head cooling effect is obvious, and the service life of the spraying head is prolonged.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a single-channel double-structure oxygen lance nozzle and blowing process. Background technique [0002] Sputtering during iron and steel smelting is a phenomenon that often occurs in the blowing process of the oxygen top-blown converter. Oxygen lance is the key equipment for iron and steel smelting. In the whole steelmaking process, the quality of the oxygen lance nozzle is directly related to the occurrence of decarburization, slagging, heating and splashing in the steelmaking process. At present, the oxygen lance nozzles used for large-scale converters in domestic steel mills are mostly traditional five-hole or six-hole oxygen lance nozzles. The structural characteristics of the nozzles are that the centerline of each nozzle hole is at the same angle as the centerline of the nozzle, and the size of each hole is also the same. In the blowing process, each nozzle hole m...

AI Technical Summary

Problems solved by technology

The dual-angle design concept can reduce converter slopping, but the slopping behavior is also affected by the specific size of the nozzle hole, and the patent does not discuss the impact of the size change of the dual nozzles on the slopping behavior

[0005] To sum up, the current nozzle and injection process cannot guarantee sufficient impact strength and stirring strength, while effectively suppressing the occurrence of splashing behavior in the converter, and ensuring the service life of the nozzle

Images