Signal processing method and system for blast furnace lining impact echo detection

A technology of shock echo and blast furnace lining, which is applied in the field of blast furnace smelting, can solve the problems of not considering the elastic wave aliasing effect, large deviation of detection results of blast furnace lining erosion state, etc.

Active Publication Date: 2019-12-13
CENT SOUTH UNIV
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Problems solved by technology

[0007] The present invention provides a signal processing method and system for blast furnace lining impact echo detection, which solves the problem of the blast furnace lining erosion state caused by the prior art without considering the aliasing effect caused by the propagation of elastic waves in non-uniform layered media. Technical problems with large deviations in test results

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  • Signal processing method and system for blast furnace lining impact echo detection
  • Signal processing method and system for blast furnace lining impact echo detection
  • Signal processing method and system for blast furnace lining impact echo detection

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Embodiment 1

[0056] refer to figure 1 The signal processing method for blast furnace lining shock echo detection provided by Embodiment 1 of the present invention includes:

[0057] Step S101, using the time-of-flight ultrasonic method to calibrate the wave velocity of the material of the measured object, and obtain the calibrated wave velocity information;

[0058] Step S102, performing empirical mode decomposition on the shock echo signal to obtain eigenmode components;

[0059] Step S103, based on the eigenmode component, the shock echo signal is filtered to obtain a filtered signal;

[0060] Step S104, classify the filtered signal based on the energy operator of the filtered signal, and obtain the thickness information of the innermost layer of the blast furnace lining based on the classification result and the wave velocity information.

[0061] The signal processing method for blast furnace lining shock echo detection provided by the embodiment of the present invention uses the tim...

Embodiment 2

[0064] refer to figure 2 , the signal processing method for blast furnace lining impact echo detection provided by Embodiment 2 of the present invention includes:

[0065] Step S201, using the time-of-flight ultrasonic method to calibrate the wave velocity of the material of the object to be measured, and obtain the calibrated wave velocity information.

[0066] Specifically, in this embodiment, when the signal processing of blast furnace lining shock echo detection is performed, it is first necessary to study the propagation mode of waves in solids. The essence of using shock echo to measure thickness is calculated by using the characteristic frequency corresponding to the interface between the measured object and the environment and the propagation velocity of the shock wave in the measured object. And because the shock wave is reflected and transmitted at the heterogeneous interface of a heterogeneous medium such as a steel-concrete structure or a carbon-concrete structur...

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Abstract

The invention discloses a signal processing method and system for blast furnace lining impact echo detection. The material of a detected object is subjected to wave velocity calibration through a timedifference ultrasonic method, calibration wave velocity information is obtained, empirical modal decomposition is conducted on impact echo signals, and an intrinsic model component is obtained; on the basis of the intrinsic model component, the impact echo signals are filtered to obtain filtered signals and energy operators based on the filtered signals; and the filtered signals are classified, and on the basis of a classification result and the wave velocity information, thickness information of the innermost layer of a blast furnace lining is obtained. The technical problem that in the prior art, elastic waves generate the aliasing effect during propagation in a non-uniform layered medium and accordingly the deviation of an erosion state detection result of the blast furnace lining is large is solved. By denoising the collected impact echo signals and further utilizing the energy operators to classify the filtered signals, echoes of various types can be effectively distinguished, sothat corresponding features of a boundary surface are accurately extracted, and finally the thickness information of the innermost layer of the blast furnace lining is accurately extracted.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting, in particular to a signal processing method and system for detecting blast furnace lining shock echo. Background technique [0002] Blast furnace smelting is a continuous production process, the operation of the furnace is complex, and there are many physical and chemical reactions. In recent years, with the increase in the demand for steel in various fields, the output of various ironmaking plants is also gradually increasing. Facing the increase in smelting intensity, the life of the hearth and furnace bottom is facing great challenges. The blast furnace hearth The outer wall can be summarized as being composed of three types of materials, the innermost carbon layer, the middle tamping material and ramming material, and the outermost steel plate furnace shell. During the ironmaking process, the molten iron in the hearth inside the blast furnace is produced by chemical reactions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/24
CPCC21B7/24
Inventor 蒋朝辉吴骞陈致蓬郭宇骞桂卫华
Owner CENT SOUTH UNIV
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