Abstract

This report is about spray system of blast furnace designed to improve furnace wall repair quality and life.

In general, there are several ways to repair furnace wall such as spraying, injection and pre-cast panel repair etc. Especially, Spraying is often used because it can repair wide range with high efficiency. But, due to enlargement of blast furnace size and distribution form of charging materials inside furnace, there are many difficulties to repair furnace wall. As a result, the need for repair quality development has been on the rise.

So, we developed brand new system which is available to evaluate repair materials, repair machine and repair quality to solve above situation. Repair materials are Silica sol bond based, and Al2O3-SiO2, Al2O3-SiC are for each part. Repair machine is developed to repair without interference of charging material but at the same time, repair ability and adhesion are enhanced. Quality evaluation facility can monitor repair state in real time. 3D Scanner evaluates rebound loss rate and repair state.

Here are results of real application. Rebound loss is under 10% with high adhesion so, reached normal operation in early stage. Especially, repairing life and repair cycle are improved by repair quality improvement. Consequently, we can guarantee stable furnace management and productivity improvement.