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Our TechnologyThe ultrasonic test method for blast furnace hearth and bottom diagnostics was first developed at Magnitogorsk State Technical University in 1995. It was first tested at the blast furnaces of Magnitogorsk Iron&Steel Works (MMK) in 1996, and in 2003 the method was finally patented. The Ultrasonic Mirror-Shadow Method to measure erosion in a blast furnace hearth and bottomThe Ultrasonic Mirror-Shadow Method is based on the ability of ultrasound to be reflected after it has hit a medium-medium interface. Ultrasound propagation time and distance are measured. During the hearth inspection procedure a furnace lining is diameter-sounded both horizontally and at an angle. The ultrasonic oscillation frequency is adjusted depending on the hearth design, lining material, dimensions of the lining plates, and type of lining. Input area, ultrasound propagation direction, and inspection pace are chosen in consideration of the hearth design, as well as the number of inspection points and directions. Normally to diameter-sound a hearth and hearth-bottom at 3 or 4 horizontal points at 2 or 3 different angles (e.g. 0°, 20°, 40°, 60°) prove to be both necessary and sufficient. The ultrasound inspection procedure is performed in a similar way at several levels. The results give information about 70..90% of the hearth volume and help determine the degree of erosion, operating profile and condition of the lining with a high degree of accuracy. An erosion topography, as well as vertical cross section views of the hearth and hearth-bottom, serve as the result of collected data processed by means of a mathematical model. This method is characterized by high accuracy, which was proved by the industrial tests carried out at the operating blast furnaces of Magnitogorsk Iron&Steel Works (MMK): the degree of error is only 4.7%. The method is perfectly safe both in terms of the blast furnace design and human health due to low ultrasonic power applied. At the current stage not only diagnostics of a hearth and hearth-bottom is possible, but also that of a stack. |
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