Nozzle clogging in roll gap lubrication (RGL) is a pain area for hot strip steel rolling. Nozzle clogging severely affects lubrication affecting rolled surface quality causing prominent hot rolling defects like banding and peel‐off phenomenon in work roll. Uneven coefficient of friction leads to variable or poor lubrication, which raises the chances of cobble and tail chewing in coils, lowers roll force reductions ultimately increasing the power consumption of the mill. The present work focuses on a holistic approach where causes leading to nozzle clogging have been identified and eliminated in a stepwise manner. Gas chromatography has been employed for the first time to get an understanding about the specific carbon chains contributing towards pulp generation. Optimising the distance between mixer and spray header and using indigenously modified spray header improves the lubrication during hot rolling. roll force reduction upto 15%–16% could be achieved.

中文翻译：

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热轧辊间隙润滑中喷嘴堵塞问题的定性研究和新方法

辊缝润滑（RGL）中的喷嘴堵塞是带钢热轧的一个难题。喷嘴堵塞会严重影响润滑，从而影响轧制表面质量，从而导致明显的热轧缺陷，例如工作辊中出现条带和剥离现象。摩擦系数不均匀会导致润滑变化或润滑不良，从而增加了卷材中的鹅卵石和尾部咀嚼的可能性，降低了轧制力的降低，最终增加了轧机的能耗。目前的工作集中在一种整体方法上，在这种方法中，逐步发现并消除了导致喷嘴堵塞的原因。气相色谱法首次用于了解导致纸浆生成的特定碳链。优化混合器和喷头之间的距离，并使用经过本地改良的喷头可改善热轧过程中的润滑。轧辊力最多可降低15％–16％。