روشی نوین برای ارزیابی تجربی خوردگی فرسایشی دمابالا در محیط زباله‌سوزی با بستر سیال

نویسندگان

1 1. گروه مهندسی مواد، دانشگاه بناب، بناب، ایران

2 2. گروه مهندسی و علم مواد، دانشگاه هوکایدو، ساپورو، ژاپن

چکیده

سطح خارجی لوله ­های مبدل­ حرارتی که در محیط زباله (زیست­توده) سوزی با بستر سیال به­ کار می ­­روند، در معرض آسیب شدید خوردگی فرسایشی دمابالا قرار دارد. به‌منظور ارزیابی رفتار و افزایش طول عمر لوله ­ها، شرایط واقعی صنعتی باید در محیط آزمایشگاه شبیه ­سازی شود. در این تحقیق، دستگاهی با بستری سیال از ماسه داغ طراحی و ساخته شد تا آلیاژ پایه نیکل SFNi4 را مورد خوردگی فرسایشی دمابالا قرار دهد. به‌منظور تشدید شرایط خورنده، ماسه سیلیسی با مقادیر 0، 5/0 و 1 درصد وزنی از مخلوط نمک‌های NaCl و KCl با نسبت مولی یک به­ یک آغشته شد. تغییر شرایط سایشی محیط، با استفاده از نرخ جریان هوای 20 و 25 لیتر بر دقیقه و زاویه برخورد ذرات به نمونه ­ها از 45 تا 90 درجه حاصل شد. نرخ زدایش ماده با اندازه­ گیری ضخامت هر نمونه پیش و پس از آزمون به ­دست آمد. پس از هر آزمون، سطح و مقطع عرضی نمونه‌ها با میکروسکوپ الکترونی روبشی و طیف‌سنجی پراش انرژی پرتو ایکس بررسی شد. در پایان پارامترهای بهینه خوردگی فرسایشی در شرایط واقعی صنعتی به‌دست آمد.

کلیدواژه‌ها

عنوان مقاله [English]

A New Method for the Experimental Evaluation of High-Temperature Erosion-Corrosion in Fluidized Bed Waste Incineration Conditions

نویسندگان [English]

  • M. Emami 1
  • Sh. Hayashi 2
1 1. Division of Materials Engineering, University of Bonab, Bonab, Iran.
2 2. Division of Materials Science and Engineering, Hokkaido University, Sapporo, Japan.
چکیده [English]

The outer surface of heat exchanger tubes that work under fluidized bed waste or biomass incineration is exposed to severe high-temperature erosion-corrosion (E-C). To evaluate the behavior and enhance the service life of the tubes, the real service conditions ought to be simulated in the laboratory. In this study a test rig with a fluidized bed of hot sand was designed and manufactured to expose nickel-based SFNi4 alloy to high-temperature E-C. In order to increase the corrosiveness of the environment, the silicon oxide sand was mixed with 0, 0.5 and 1 wt.% of a mixture of NaCl and KCl salts with 1:1 molar ratio. The erosive conditions of the environment were changed by altering air flow rate from 20 to 25 L/min and changing the sand incident angle from 45 to 90 degrees. The rate of material removal was calculated by measuring the thickness of each sample before and after the test. After each experiment, the surface and cross-section of specimens were studied using SEM and EDS analysis. Finally, the optimum E-C parameters to ensure actual industrial conditions were obtained.

کلیدواژه‌ها [English]

  • High-temperature erosion-corrosion
  • Heat exchanger
  • Fluidized bed incineration

مراجع

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مواد پیشرفته در مهندسی
دوره 38، شماره 3
آذر 1398
صفحه 101-113

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