کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1685327 1010553 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Measurement of density distribution of a cracking catalyst in experimental riser with a sampling procedure for gamma ray tomography
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
پیش نمایش صفحه اول مقاله
Measurement of density distribution of a cracking catalyst in experimental riser with a sampling procedure for gamma ray tomography
چکیده انگلیسی

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 Δs inside riser is measured and a criterion for determining spatial resolution is proposed. Experiments are carried out to demonstrate resolution effects of three Δs values: 3.30 × 10−3, 6.20 × 10−3 and 12.00 × 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 Δs/R to internal riser radius are correlated to counting time in the sampling procedure. Results are discussed by comparison with values from literature.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 266, Issue 5, March 2008, Pages 841–848
نویسندگان
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