Method for prolonging service life of oxygen tuyere of European smelting furnace and adjustable tuyere assembly

The invention discloses a method for prolonging the service life of an oxygen tuyere of an European smelting furnace and an adjustable tuyere assembly. Structural optimization is carried out, the cooling strength of a high-temperature area is enhanced, and a surfacing process is carried out on a hot surface; a proper air blowing speed is controlled, and material distribution is optimized; coke with proper lumpiness is used, so that the air permeability and liquid permeability of the semi-coke bed are improved; strengthening furnace front slag iron tapping management; the normal oxygen feeding state of the tuyere is guaranteed, and the front end of the tuyere is active. Through structural optimization, the resistance of cooling water in the front cavity of the small sleeve at the front end of the tuyere is reduced, the cooling effect is improved, the cooling strength of a high-temperature area is enhanced, the problem of high-temperature heat transfer in front of the tuyere is solved, the small sleeve is prote