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首页> 外文会议>2017 15th International Conference on Quality in Research : International Symposium on Electrical and Computer Engineering >Portable gamma ray tomography system for investigation of geothermal power plant pipe scaling
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Portable gamma ray tomography system for investigation of geothermal power plant pipe scaling

机译：便携式伽马射线层析成像系统，用于研究地热发电厂的管道结垢

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A portable gamma ray tomography system has been designed to investigate geothermal power plant pipe scaling. Furthermore, the system could be applied to diagnose industrial processes unit such as pipeline, heat exchanger, and so on. The system consists of mechanical parts, computerized controlled module, a gamma ray source (80 mCi of Cs-137), a scintillation detector NaI(Tl), data acquisition and computer. The mechanical part was designed to meet the portability standard of industrial processes unit such as dimension, position, material type, etc. The investigated object is scanned an in two ways (translation and rotation) of ray transmission to capture attenuated radiation automatically. The result of object investigation is displayed in computer directly using a proposed reconstruction image technique. The reconstruction image was performed using Filtered Back Projection (FBP) algorithm and optimized with the weighted correction factor for each pixel. The weighted correction factor was computed based on the modeling of gamma ray transmission in selected mechanical system. In evaluating the proposed system, experiments were performed using a geothermal power plant pipe that has 275 mm diameter within known scaling form. Steady state water was flowed inside the pipe to simulate multiphase condition in geothermal power plant pipeline. Scanning configuration was set up to 4 mm steps and 32 projections. Based on the chosen evaluation criteria, the reconstruction image of the proposed system shows good result. Finally, the proposed portable gamma ray tomography system is suitable to industrial applications due to its portability and accuracy in detecting the form of pipeline scaling.
机译：便携式伽马射线断层扫描系统已设计用于调查地热发电厂的管道结垢。此外，该系统可以应用于诊断工业过程单元，例如管道，热交换器等。该系统由机械零件，计算机控制的模块，伽马射线源（Cs-137的80 mCi），闪烁探测器NaI（Tl），数据采集和计算机组成。机械零件的设计符合工业过程单元的便携性标准，例如尺寸，位置，材料类型等。被测物体以射线传输的两种方式（平移和旋转）进行扫描，以自动捕获衰减的辐射。使用建议的重建图像技术将对象调查的结果直接显示在计算机中。重建图像是使用过滤后向投影（FBP）算法执行的，并使用每个像素的加权校正因子进行了优化。加权校正因子是根据所选机械系统中伽马射线传输的模型计算得出的。在评估提出的系统时，使用地热发电厂的管道进行了实验，该管道的直径为275 mm，处于已知的缩放比例范围内。稳态水在管道内流动，以模拟地热发电厂管道中的多相状态。扫描配置设置为4毫米步距和32个投影。基于选择的评估标准，所提出系统的重建图像显示出良好的效果。最后，所提出的便携式伽马射线断层扫描系统由于其便携性和在检测管道结垢形式方面的准确性而适合于工业应用。

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