نوع مقاله : مقاله پژوهشی
نویسندگان
1
پژوهشکده چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران- ایران
2
دانشکده مهندسی، دانشگاه مازندران، صندوق پستی: 416، بابلسر-ایران
3
شرکت فناوری‌های پیشرفته ایران، سازمان انرژی اتمی، صندوق پستی: 5931-143995، تهران- ایران
چکیده
عنصر گوگرد شامل 4 ایزوتوپ پایدار است که سنگینترین ایزوتوپ آن، گوگرد 36، در تولید رادیوایزوتوپ و فعالسازی نوترونی کاربرد دارد. در این پژوهش با توجه به غلظت بسیار پایین گوگرد 36 در خوراک طبیعی، از زنجیره گذرای تک‌خروجی جهت جداسازی این ایزوتوپ استفاده شده است. برای شبیهسازی زنجیره، معادلات توزیع غلظت در حالت گذرا با استفاده از روش لاسونن گسستهسازی شده و با روش تکرار q، خطی میشوند. کد نوشته شده با استفاده از نتایج تجربی موجود صحتسنجی میشود. برای جداسازی ایزوتوپ گوگرد به غنای بالای 90 درصد توسط تعداد ماشین سانتریفیوژ معین، چیدمانهای مختلف از زنجیره مربعی تک‌خروجی، مرحله ورود خوراک و شدت جریان خوراک بررسی شده است. در چیدمان با 15 مرحله و 8 ماشین سانتریفیوژ در هر مرحله، غلظت ایزوتوپ گوگرد 36 در مخزن پس از 1460 ساعت به 95 درصد میرسد. نتایج نشان داد کاهش جریان خوراک زنجیره و افزایش فاصله مرحله ورود خوراک از مخزن، باعث افزایش غلظت گوگرد 36 در مخزن میشود.
کلیدواژه‌ها
عنوان مقاله [English]
Simulation of 36S stable isotope enrichment by square single withdrawal cascade
نویسندگان [English]
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A.R. Keshtkar
1
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A. Rashidi
2
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J. Karimi Sabet
1
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A. Noroozi
3
1
Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 11365-8486, Tehran-Iran
2
Faculty of Engineering and Technology, University of Mazandaran, P.O.Box: 416, Babolsar-Iran
3
Iran Advanced Technologies Compony, AEOI, P.O.Box: 143995-5931, Tehran-Iran
چکیده [English]
Among the four stable isotopes of sulfur, the heaviest isotope, 36S, has found many applications in radioisotope production and neutron activation. In the present work, due to the very low natural abundance of 36S, the single withdrawal cascades are used to separate this isotope. The concentration distribution equations in the transient state are separated using the Laasonen method and linearized by the q iteration method to simulate the cascade. The code is validated using existing experimental results. To separate the 36S isotope to a high concentration of 90% by a fixed number of centrifuge machines, different arrangements of the square single withdrawal cascades, the feed stage location, and the feed flow rate were investigated. In the arrangement with 15 stages and eight centrifuge machines at each stage, the concentration of 36S in the reservoir reaches 95% after 1460 hours. The results showed that reducing the feed flow of the cascade and increasing the distance of the feed stage from the reservoir leads to an increment in the concentration of 36S in the reservoir.
کلیدواژه‌ها [English]
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Single withdrawal cascades
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Square arrangement
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36S isotope
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Transient condition
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Simulation
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q iteration method
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