| 摘要 |
PURPOSE:To provide a coolant for protection which cools tuyeres effectively by mixing a specific amt. of hydrocarbon which produces carbon when thermally decomposed with carbon dioxide as a coolant for protection around the tuyeres which blow refining gases into molten iron. CONSTITUTION:In a gaseous mixture of hydrocarbon and carbon dioxide, hydrocarbon which produces carbon when thermally decomposed is contained at 10-40vol% with the gaseous mixture. The hydrocarbon-base coolant for tuyeres decomposes in the high temp. areas near the preceding end parts of the tuyeres and absorbs heat. For example, if gaseous propane is used as hydrocarbon, the coolant absorbs heat and produces carbon like the equationI. Further, the carbon dioxide reacts with carbon and causes the endothermic reaction as shown by the equation II. Thus the tuyeres are cooled effectively. |
