Gamma-ray computed tomography SCANNERS for applications in multiphase system COLUMNs

• Autorzy: Calvo W. A. P. , Hamada M. M. , Sprenger F. E. , Vasquez P. A. S. , Rela P. R. , Martins J. F. T. , de Matos Pereira J. C. S. , Omi N. , de Mesquita C. H.
• Konferencja: Proceedings of the International Conference on Recent Developments and Applications of Nuclear Technologies 15-17 September 2008, Białowieża, Poland
• Języki publikacji: EN

Abstrakty

EN

Gamma-ray tomography experiments have been carried out to detect spatial patterns in the porosity, in a 0.27 m diameter packed steel column using a first generation computed tomography (CT) system. The CT scanner consists of a NaI(Tl) detector 5.08 cm in diameter, and an encapsulated 137Cs (3.7 GBq) radioactive source, located opposite to the center of the detector. The detector and the source, mounted on a fixed support and the column, can rotated and dislocate by two stepping motors controlled through a microprocessor. Different sizes of stainless steel Raschig rings (12.6, 37.9 and 76 mm) have been examined. The primary objective of this work is to detect spatial patterns and statistical information on porosity variation in packed distillation columns. Horizontal scans, at different vertical positions of the packed bed were made for each size of Raschig rings. Radial porosity variation within the packed bed has been determined. This study has demonstrated that the porosity and its spatial distribution in a metallic packed column can be measured with adequate spatial resolution using the gamma-ray tomography technique. After validation of this first generation CT, the turntable design to rotate and dislocate the 60Co or 137Cs sealed gamma-ray sources and multidetector array for the third generation industrial computed tomography was also developed.

Słowa kluczowe

EN

industrial computed tomography; multiphase flow systems; non-destructive testing; gas absorption column; industrial process optimization; packed distillation columns; scanning systems

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2009
• Tom: Vol. 54, No. 2
• Strony: 129--133
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Calvo W. A. P.

autor

Hamada M. M.

autor

Sprenger F. E.

autor

Vasquez P. A. S.

autor

Rela P. R.

autor

Martins J. F. T.

autor

de Matos Pereira J. C. S.

autor

Omi N.

autor

de Mesquita C. H.

• Brazilian National Nuclear Energy Commission (CNEN/SP), Institute for Nuclear and Energy Research (IPEN), Radiation Technology Center (CTR), 2242 Prof. Lineu Prestes Ave., – Cidade Universitaria, 05508-000, Săo Paulo – SP, Brazil, Tel.: [phone],

Bibliografia

• 1. Chaouki J, Larachi F, Dudukovic MP (1997) Non-invasive tomographic and velocimetric monitoring of multiphase flows. Ind Eng Chem Res 36:4476–4503
• 2. Chen JW, Gupta P, Sujatha D, Al-Dahhan MH, Dudukovic MP, Toseland BA (1998) Gas hold-up distribution in large diameter bubble columns. Flow Meas Instrum 9;2:91–101
• 3. Chen J, Rados N, Al-Dahhan MH, Dudukovic MP, Nguyen D, Parimi K (2001) Particle motion in packed/ebullated beds by CT and CARPT. AIChE J 47;5:994–1004
• 4. Chu CF, Ng KM (1989) Flow in packed tubes with a small tube to particle diameter ratio. AIChE J 35:148–156
• 5. International Atomic Energy Agency (2008) Industrial process gamma tomography. IAEA-TECDOC-1589. IAEA, Vienna
• 6. McGreavy C, Foumeny EA, Javed KH (1986) Characterization of transport properties for fixed bed in terms of local bed structure and flow distribution. Chem Eng Sci 41:787–797
• 7. Niu M, Akiyama T, Takahashi R, Yagi J (1996) Reduction of the wall effect in a packed bed by hemispherical lining. AIChE J 42:1181–1186
• 8. Sanches MP, Hanaguchi MI, Beckmann FS, Calvo WAP (2007) Radiological safety in the gamma scan procedures. In: Proc of 2007 Int Nuclear Atlantic Conf – INAC 2007, 30 September – 5 October, 2007, Santos, Brazil, E15--1567(6 p.)
• 9. Tetzner GC, Hamada MM, Madi Filho T et al. (2007) Description of two tomography systems developed at IPEN-CNEN/SP. In: Proc of 2007 Int Nuclear Atlantic Conf – INAC 2007, 30 September – 5 October, 2007, Santos, Brazil, E05-1876(7 p.)
• 10. Vasquez PAS, de Mesquita C, Hamada MM (2007) Phantom study using a first generation tomography system. In: Proc of 2007 Int Nuclear Atlantic Conf – INAC 2007, 30 September – 5 October, 2007, Santos, Brazil, E07--1699(7 p.)
• 11. Vasquez PAS, de Mesquita CH, LeRoux GAC, Hamada MM (2008) Methodological analysis of gamma tomography system for large random packed columns. (abstract). In: 7th Int Topical Meeting on Industrial Radiation and Radioisotope Measurements Application – IRRMA7. 22–27 June 2008, Prague, Czech Republic
• 12. Wang Z, Afacan K, Nandakumar K, Chuang K (2001) Porosity distribution in random packed columns by gamma-ray tomography. Chem Eng Prog 40:209–219