Electrical capacitance tomography (ECT) provides a non-intrusive means to visualize cross-sectional material distribution of gas–solid bubbling fluidized beds. Successful application of ECT strongly depends on the image reconstruction algorithm used. For on-line measurements of bubbling fluidized beds, employing an algorithm that can produce high-quality images without extensive computation is necessary. Using the conventional Tikhonov regularization algorithm, image quality in the central area is basically satisfied but suffers from artifacts in the near-wall region. To solve this problem, a similar division operation learned from linear back projection was introduced to modify the conventional Tikhonov algorithm. Both numerical simulations and experiments were performed to evaluate the modified technique. The results indicate that the artifacts can be effectively removed and the reconstructed image quality is similar to Landweber method with dozens of iterations. Furthermore, the modified Tikhonov technique shows high accuracy when obtaining important hydrodynamic parameters in gas–solid bubbling fluidized beds. © 2017 American Institute of Chemical Engineers AIChE J, 2017

中文翻译：

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使用ECT和改进的Tikhonov正则化技术研究气固鼓泡流化床

电容层析成像（ECT）提供了一种非侵入性的方法，可以可视化气固鼓泡流化床的横截面材料分布。ECT的成功应用在很大程度上取决于所使用的图像重建算法。对于起泡流化床的在线测量，需要一种无需大量计算即可产生高质量图像的算法。使用常规的Tikhonov正则化算法，基本上可以满足中心区域的图像质量，但是在近壁区域会出现伪影。为了解决这个问题，引入了从线性反投影中学到的类似除法运算来修改传统的Tikhonov算法。进行了数值模拟和实验，以评估改进后的技术。结果表明，可以有效去除伪像，并且重建图像的质量类似于Landweber方法，经过数十次迭代。此外，当在气固鼓泡流化床中获得重要的流体力学参数时，改进的Tikhonov技术显示出很高的精度。©2017美国化学工程师学会AIChE的Ĵ，2017年