Air tuyeres account for 30% of all heat losses in a blast furnace. One of the methods for lining a tuyere from the air passage side is to use a thermal insulation insert. However, certain defects of the insert on the working surface of the air passage along with thermal stresses generated therein may lead to its premature failure during operation. This paper discusses applying a slurry coating to the inner surface of the insert to prevent its premature cracking and improve performance. The effect of a slurry-coated thermal insulation insert on gas dynamics and heat transfer inside a blast furnace air tuyere was studied, and simulation of the above processes was performed. It was shown that applying a slurry coating to the lower portion of the thermal insulation insert is most beneficial for increasing the heat flux and raising the air-blast temperature at the tuyere outlet, while applying the coating to the entire inner surface of the insert helps improving its resistance, which has been confirmed experimentally.

中文翻译：

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浆料涂层对高炉风口隔热嵌件电阻的影响

风口占高炉所有热损失的 30%。从风道侧给风口加衬的方法之一是使用隔热嵌件。然而，空气通道工作表面上的插入件的某些缺陷以及其中产生的热应力可能导致其在操作期间过早失效。本文讨论了在刀片的内表面涂抹浆料涂层以防止其过早开裂并提高性能。研究了浆料涂层隔热插件对高炉风口内气体动力学和传热的影响，并对上述过程进行了模拟。