Optimum design of capacitance sensor array for imaging the solids distribution of fluidized bed
Fluidized beds are widely used in many industries. Fluidized bed combustion technique is rapidly developed and used to coal-fired power stations in order to improve the combustion efficiency and properties. Measuring the solids distributions of fluidized beds in furnaces are directly related to their working conditions and combustion efficiency, and furthermore are the basis of controlling the beds in the optimum run. Electrical capacitance tomography (ECT) systems recommended in this paper are non-intrusive and inexpensive being developed suitable for imaging density distributions in process pipelines, fluidization processes and so on. Considering that three-dimensional images are required in fluidization processes, several level electrodes are selected as the ECT systems' sensor array, which can provide 3D images by piling up many 2D sectional images. The aim of this paper is to select optimal structure parameters of the sensor array so as to reduce the influence between levels and to improve the properties of the images by use of the numerical tool of finite element method (FEM) and physical phantoms. First, a brief introduction of ECT systems was made and a sensor structure used for visualizing the fuel distributions in fluidized bed combustion was presented. And then, the orthogonal experimental design technique was carried out and a set of optimum sensor structure parameter was given by using fidelity of reconstructed image, spatial image error (SIE), as the optimum objective function. Finally, a comparison was made between two reconstructed images by the optimum structure and a non-optimum structure respectively, the results showed that the image by the non-optimum structure was with errors in gray-level and the SIE = 0 of the image by the optimum structure.
- Research Organization:
- Northeastern Univ., Shenyang (CN)
- OSTI ID:
- 20006830
- Report Number(s):
- CONF-990534-; TRN: IM200008%%437
- Resource Relation:
- Conference: 15th International Conference on Fluidized Bed Combustion, Savannah, GA (US), 05/16/1999--05/19/1999; Other Information: 1 CD-ROM. Operating system required: Windows 3.x; Windows 95/98/NT; Macintosh, Power Macintosh; UNIX. All systems need 2X CD-ROM drive.; PBD: 1999; Related Information: In: Proceedings of the 15th national conference on fluidized bed combustion, by Reuther, R.B. [ed.], [1800] pages.
- Country of Publication:
- United States
- Language:
- English
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