Analysis of tuyere failure categories in 5800 m³ blast furnace

Abstract

The tuyere is an important item of equipment for a blast furnace. However, the tuyere life of the large blast furnace can be quite short. The failure of tuyere will seriously affect the production of a blast furnace. So, it is of great significance to carry out experimental research on any damaged tuyere with a view to extending its service life. The damaged tuyere from a 5800m 3 blast furnace in China was analyzed by SEM, EDS and optical microscope. According to the results of microscopic phase analysis, the tuyere failure types are defined and classified. It is found that the tuyere failure types of the large blast furnace are mainly divided into four categories: erosion, pitting, cracking and bending. The high-temperature slag-iron repeatedly bonding and peeling off from the tuyere is the main cause of tuyere damage. Finally, the failure mechanism of different types of damaged tuyere is analyzed.

Impact of Flow Boiling on Blast Furnace Tuyere Life: A Designer's Perspective

“…q in ¼ 0.005281 Â P 1.156 Â ð1.8 Â ðT À T sat ÞÞ 2.40 P 0.0234 (6) The heat transfer prior to the inception of boiling is given by the Dittus-Bolter equation ( 4) and the corresponding heat flux by Equation (5). The temperature at which heat flux at the inception of nucleate boiling, Equation ( 6), exceeds the heat flux given by Equation ( 5), is the temperature at which nucleate boiling initiates.…”

“…Gao et al have explained three categories of tuyere failure, erosion and melting, bending, and crack propagation. [ 6 ] Out of these, the mechanism of erosion and the subsequent failure have been elaborated by Gao et al [ 7 ] The erosion pattern of the tuyere has also been exposed by comparing the used tuyeres with the original model by Chatterjee et al [ 8 ] It was found that the top part of the tuyere nose is the most vulnerable.…”

Analysis of Erosion Mechanism of Wear‐Resistant Layer in Large Blast Furnace Tuyere

“…Previous researchers have conducted extensive research on how to improve the life of blast furnace tuyeres. Gao et al [ 7 ] analyzed the erosion mechanism of tuyeres in large blast furnaces by observing samples from different parts of damaged tuyeres in a 5800 m 3 blast furnace in China. They found that the erosion types of the tuyeres are very complex and can be classified into four categories: melting erosion, point erosion, cracking, and deformation of the tuyere.…”

Optimization Study of Annular Wear-Resistant Layer Structure for Blast Furnace Tuyere

“…Its working environment is extremely harsh. On one hand, the tuyere small sleeve end is repeatedly bonded and peeled off by the high-temperature slag and iron, causing the melting and erosion failure of the tuyere small sleeve end [2][3][4]. On the other hand, the hot air and fuel supplied by the tuyere small sleeve to the furnace undergo violent combustion under high-temperature and high-pressure conditions [5], leading to the tuyere small sleeve end bearing a huge thermal load.…”