Measurement of density distribution of a cracking catalyst in experimental riser with a sampling procedure for gamma ray tomography

被引：11

作者：

Dantas, C. C. ^{[1
]}

Melo, S. B. ^{[2
]}

Oliveira, E. F. ^{[2
]}

Simoes, F. P. M. ^{[2
]}

dos Santos, M. G. ^{[2
]}

dos Santos, V. A. ^{[3
]}

机构：

[1] Univ Fed Pernambuco, Dept Nucl Energy, BR-50740540 Recife, PE, Brazil

[2] Univ Fed Pernambuco, Informat Ctr CIN, BR-50740540 Recife, PE, Brazil

[3] Catholic Univ Pernambuco UNICAP, Dept Chem, BR-50050900 Recife, PE, Brazil

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2008年 / 266卷 / 05期

关键词：

gamma transmission; FCC catalyst; single beam; tomographic parameters; sampling criterion;

D O I：

10.1016/j.nimb.2008.01.029

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

By scanning a riser the number of the gamma ray trajectories and the beam width involve temporal, spatial and density resolutions as they are closely correlated parameters. Therefore, evaluation of parameters and their interaction quantification, certainly, are required in the imaging process. Measuring the density distribution of the catalyst from the FCC - fluid cracking catalytic process in an experimental riser in single beam tomographic system, density resolution is evaluated and correlated with spatial resolution. The beam width As inside riser is measured and a criterion for determining spatial resolution is proposed. Experiments are carried out to demonstrate resolution effects of three As values: 3.30 x 10 (- 3), 6.20 x 10 (- 3) and 12.00 x 10 (- 3) m. The gamma beam profile is modeled and a sampling rate according to Nyquist criterion is analyzed. The 4.3%, 8.1% and 15.6% ratios of Delta s/R to internal riser radius are correlated to counting time in the sampling procedure. Results are discussed by comparison with values from literature. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：841 / 848

页数：8

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