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A Correction Method for CT Radiation Hardening in Multiphase Flow Systems

A technology of multiphase flow and correction method, which is used in material analysis using radiation, computed tomography scanner, echo tomography, etc. It can solve the problem of inability to quantitatively determine hardening correction parameters, and achieve the effect of saving manpower, material resources and financial resources.

Active Publication Date: 2011-12-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0007] Aiming at the problem that the hardening correction parameters cannot be determined quantitatively when CT is applied to multiphase flow measurement, the present invention proposes a computer simulation of multiphase flow field and CT scanning to quantitatively determine the hardening correction parameters of the multiphase flow field as the scanning object. Save a lot of manpower, material and financial resources for the design and development of CT

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  • A Correction Method for CT Radiation Hardening in Multiphase Flow Systems
  • A Correction Method for CT Radiation Hardening in Multiphase Flow Systems
  • A Correction Method for CT Radiation Hardening in Multiphase Flow Systems

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[0033] Circulating fluidized bed reactors are widely used in petroleum smelting, boilers, metallurgy and other fields. The cross-sectional material distribution in the reactor is an important tender for the operation status of the reactor. CT can be used to measure the cross-sectional view of the reactor material distribution without interference , has aroused great interest in the industry in recent years. However, for X-ray CT, because its energy spectrum is continuously distributed, rather than a single value, it is inevitable to produce radiation hardening phenomenon during actual measurement, which will cause deviation between the measurement result and the real value. Features hardening correction. However, since the multiphase flow system in this type of reactor is a typical complex system, a slight change in the initial operating conditions can lead to drastic changes in the local information of the flow field. Therefore, it is difficult to generate an accurate and rep...

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Abstract

The present invention provides a method for correcting CT radiation hardening in a multiphase flow system, comprising the following steps: 1) using fluid mechanics software to generate a simulated flow field of the multiphase flow system; 2) selecting a two-dimensional section of the simulated flow field, Obtain the flow field data of this two-dimensional cross-section; 3) select the material and thickness of different filter discs, simulate the process that CT scans the described two-dimensional cross-section, and obtain the simulated two-dimensional cross-section corresponding to different filter disc materials and thicknesses respectively. Reconstructing the image; 4) determining the material and thickness of the filter required for actual CT measurement according to the degree of approximation between each simulated two-dimensional reconstructed image and the simulated flow field data. The advantage of the present invention is that, by combining computational fluid dynamics with CT simulation, the shortcoming of being unable to produce an accurate and repeatable flow field in physical experiments can be overcome; and the present invention can determine the hardening correction parameters of the CT system through computer simulation, thereby Save a lot of manpower, material and financial resources.

Description

technical field [0001] The invention belongs to the technical field of multiphase flow measurement, and in particular, the invention relates to a method for obtaining correction parameters of CT radiation hardening. Background technique [0002] Multiphase flow widely exists in industrial production. The multiphase flow system is a typical complex system, and its internal heterogeneous structure has multi-scale characteristics. Under the condition far from equilibrium, the slight change of the operating parameters not only affects the micro-scale structure, but may also cause the macro-scale structure of the whole system to change. The dramatic changes have greatly affected the performance of the reactor. In-depth research and control of multiphase flow devices requires reliable experimental data as the basis, among which, the measurement of material concentration distribution in the device cross-section is an important content. [0003] At present, the commonly used multi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/12A61B6/03
Inventor 孟凡勇王维李静海
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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