Gamma Ray CT of Two Phase Flow in a Cold FCC Type Pilot Unit with Data Acquisition Integration
Marcio F. P. de Brito1*, Enivaldo B. dos Santos2, Geyse M. da Silva1, Alice V. de Vasconcelos1, Alex E. de Moura1, Carlos C. Dantas1, Silvio B. de Melo1, Emerson A. de O. Lima3
1Universidade Federal de Pernambuco (Avenida professor Luiz Freire, 1000, Recife, Pernambuco Brasil)
2Universidade Federal de Campina Grande (Rua Aprígio Veloso, 882, Campina Grande, Brasil)
3 Universidade Pernambuco (Rua Benfica, 455, Recife Pernambuco)
The two phase flow in a cold Fluidized Catalytic Cracking (FCC) pilot unit is quantified for dilute and dense transport regimes. The circulating solid flow is precisely controlled by process automation. Axial and radial concentration distributions were evaluated in the Cold Pilot Unit (CPU) by gamma ray transmission measurements. Monitoring data for air flow rate and pressure were stored with the gamma intensity measurements were in a data bank. A LabVIEW data acquisition was used to integrate the whole dataset in one datasheet. The FCC reactor riser features the main fluid dynamics information of interest. The CPU riser with 6.7 m high and 0.092 m in diameter; the return column is same size connected by the separation unit on the top. Such CPU geometry is designed for circulating two phase flow. It was constructed from acrylic transparent material. Air and FCC catalyst circulate under steady state operational conditions as required by fluid dynamic models hypothesis. Three test sections were installed along the riser to monitor pressure and gamma ray transmission measurements using an 241Am isotopic source and Na(Tl) scintillation detector. The CPU geometry was a classical design with solid injection automation plus precise FCC catalyst inventory procedure provided circulating flow quantification. The Riser flow annular and kern models were configured in experimental data for diluted and dense transport and comparison with literature is carried out.
Keywords: FCC, gamma transmission, pilot unit, solid flow
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