Improving the Durability of Blast-Furnace Tuyeres
| Autor: | V. G. Shchipitsyn, L. D. Nikitin, S. F. Bugaev, L. V. Portnov |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Metallurgist. 58:488-491 |
| ISSN: | 1573-8892 0026-0894 |
| DOI: | 10.1007/s11015-014-9938-7 |
| Popis: | When blast furnaces are forced to run at high speed, one way of reducing their downtime, increasing their productivity, and lowering the cost of making pig iron is to improve the durability of the tuyeres. Experience shows that the main causes of tuyere failure are crack formation, wear, and burn-throughs. The durability of a tuyere and the type of problems encountered with it are significantly affected by the sophistication of the smelting technology that is used and the quality of the charge materials. Most tuyeres do not last longer than three months when the supply of raw materials to the furnace is unstable, and 20% of tuyeres (out of the total number that are replaced) have lasted less than half a month under such conditions. The amount of furnace downtime necessitated by the replacement of failed tuyere parts has reached 2.0–2.5% of nominal operating time, which has seriously hurt furnaces’ technical-economic indices. Stabilization of the operation of blast furnaces at EZRAZ ZSMK has allowed the combine to work on improving the durability of the tuyeres by redesigning them, improving the quality of the work done in making them, and applying protective coatings (by plasma deposition, electron-beam hard facing, etc.). The combine’s introduction of a new technology for making tuyeres and the strengthening of these pieces of equipment while ensuring a satisfactory cooling rate have made it possible to reduce the incidence of tuyere failure due to cracking. The number of tuyere replacements has declined during both normal and high-speed operation of the furnaces, which has in turn elevated tuyere service life to an average of 5–7 months and a maximum of 14–15 months. |
| Databáze: | OpenAIRE |
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