Numerical Simulation Of Temperature Field And Stress Field In The Tuyere

Tuyere which is an important part of the blast furnace is often destructed by the formidable working conditions, such as abrasion form coal dust with high rate and erosion from burner gas with high temperature. At the present, domestic tuyeres are made of pure copper, and their lives are only 2-3 months. If tuyeres are changed frequently, the stability of the blast will be cost; the production of the blast will be reduced; the working strength of workers will be increased. Studying the means of improving the service life of tuyere is actual significance.In this paper, it studied the temperature field and the stress field of tuyere using the numerical simulation method, and simulated transient temperature field and stress field of the Cu-tuyere, the temperature field and the stress field of the Cu-tuyere with different incrustation scale thickness and impurity, and the temperature field and the stress field of the Cu-tuyere with ceramics,nickel alloy layers.The simulation results indicate that the temperature distribution and the stress distribution are very homogeneous in the Cu-tuyere without incrustation scale and impurity. The highest temperature is 255℃, and its maximal stress is 43.7MPa, both of them are under the promised values. The highest temperature and the maximal stress are little increased in the Cu-tuyere with impurity, so it needn't to require purity of Cu when made tuyere. When formatting incrustation scale, the highest temperature and the maximal stress are wide-range raised in tuyere. The highest temperature of copper tuyere is above the promised values when the thickness of incrustation scale is above 0.16mm. As result of that preventing incrustation scale formation is the important method of improving life of tuyere. As the ceramic layer on tuyere front and its flank, the stress of the Cu-ceramic joint on tuyere front is maximal, the stress of 0.1mm ceramic layer is 190MPa, above the promised values, will produce split. As the nickel alloy layer on tuyere front and the ceramic layer on its flank, the highest temperatures and the maximal stress are both lower. When the layers is under 0.5mm, the highest temperatures and the maximal stresses of the base of the Cu-tuyere, nickel alloy, ceramic, the Cu-nickel alloy joint, the Cu-ceramic joint are both under the promised values. The trial use in factory shows that the service life of tuyere was improved obviously.