Inspecting the current thickness of a refractory wall inside an operational blast furnace using the impact echo method

Wang, Chung Yue; Chiu, Chin Lung; Tsai, Kun Yi; Chen, Pi Kuan; Peng, Peng Chi; Wang, Hao Lin

doi:10.1016/j.ndteint.2014.04.001

Cited by 7 publications

(3 citation statements)

References 1 publication

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“…Except for the lowest height, the predictions are close to the peak at the lowest frequency ignoring the peak at around 500 Hz, which would predict a wall thickness larger than the uneroded thickness. A similar strategy is published in [8]. The lowest height poses a problem for this strategy, the measurement height is just below the bending point of the erosion line.…”

Section: Case 1: a Slanted Erosion Linementioning

confidence: 99%

Observations and improvements on the impact-echo method used for blast furnace hearth refractory measurement

Commandeur

Sprik

Stolk

et al. 2022

Ironmaking & Steelmaking

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The refractory thickness of the blast furnace hearth is a critical parameter for the safe operation of a blast furnace. A replacement of the refractory comes with high costs and, therefore, unnecessary repairs should be avoided. A promising method to estimate the refractory thickness is the impactecho method. For the interpretation of impact-echo, often, the peaks in the spectrum of the measured signal are associated with the echo from an interface. In this paper, it is shown that this method should be used with care when applied to multi-layered structures. An alternative approach is presented for the calculation of the thickness of multi-layered structures. This method solves the wave equation based on transmission line theory. The formula is checked against 2D finite element analysis and for simple layered structures, good agreement is found. Three cases are simulated using finite element models. Both the impact-echo method and the proposed method overestimate the refractory thickness.

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Section: Case 1: a Slanted Erosion Linementioning

confidence: 99%

Observations and improvements on the impact-echo method used for blast furnace hearth refractory measurement

Commandeur

Sprik

Stolk

et al. 2022

Ironmaking & Steelmaking

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“…Where, ƒ is the resonance frequency for the thickness of the ℎ layer [22]. ABAQUS simulation software is used for this simulation.…”

Section: ) Principle Of Thickness Measurementmentioning

confidence: 99%

Detection of Blast Furnace Hearth Lining Erosion by Multi-Information Fusion

Wen

Zhao³

2021

IEEE Access

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The blast furnace hearth refractories are exposed to complex chemical attack and thermal stress erosion, which will lead to the gradual failure of refractories. The campaign life of a blast furnace depends on its remaining hearth refractory lining, so it is very important to understand the remaining thickness of hearth refractory for prolonging the service life of blast furnace. In order to understand the damage of hearth refractory more accurately, a multi-information fusion method for measuring the refractory lining thickness of blast furnace hearth was proposed, which was based on the application advantages of impact echo technology, thermocouple and cooling stave heat flux intensity in blast furnace hearth. The influence of temperature change in different material layers of hearth on wave velocity was considered. In addition, the thickness of refractory lining of blast furnace hearth was detected by the method of multi-information fusion. It is found that the multi-information fusion thickness detection method improves the accuracy of thickness measurement compared with the impact echo thickness detection method. INDEX TERMSBlast furnace hearth, cooling stave heat flux intensity, multi-information fusion, simulation, thermocouple, thickness detection JIAOCHEN MA was born in Shanxi, China, in 1979. He received the B.Eng. and M.Eng. degrees in mechanical engineering and the Ph.D. degree in detection technology and automation device from

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“…When a component is composed of two different materials [19], the thickness frequency from the bottom surface to the top surface is…”

Section: Theoretical Calculationmentioning

confidence: 99%

Experimental Research and Numerical Simulation on Grouting Quality of Shield Tunnel Based on Impact Echo Method

Yao

Chen

2016

Shock and Vibration

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To identify shield grouting quality based on impact echo method, an impact echo test of segment-grouting (SG) test piece was carried out to explore effect of acoustic impedance of grouting layers and grouting defects on impact echo law. A finite element numerical simulation on the impact echo process was implemented. Test results and simulation results were compared. Results demonstrated that, under some working conditions, finite element simulation results and test results both agree with theoretical values. The acoustic impedance ratio of SG material influenced the echo characteristics significantly. But thickness frequency could not be detected under some working conditions because the reflected energy is weak. Frequency feature under grouting defects was more complicated than that under no grouting defects.

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Inspecting the current thickness of a refractory wall inside an operational blast furnace using the impact echo method

Cited by 7 publications

References 1 publication

Observations and improvements on the impact-echo method used for blast furnace hearth refractory measurement

Observations and improvements on the impact-echo method used for blast furnace hearth refractory measurement

Detection of Blast Furnace Hearth Lining Erosion by Multi-Information Fusion

Experimental Research and Numerical Simulation on Grouting Quality of Shield Tunnel Based on Impact Echo Method

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