نشریه علمی فرآیند نو

نشریه علمی فرآیند نو

بررسی خوردگی اسید نفتنیک و کلراید در مبدل پیش‌گرمایش نفت خام طبق استاندارد 581 API

نوع مقاله : کاربردی

نویسندگان
کارشناس ارشد عملیات پالایش، پالایشگاه شیراز، شیراز، ایران
چکیده
در شبکه پیش‌گرمایش نفت خام پالایشگاه شیراز، دسته لوله­ یکی از مبدل حرارتی که از نفت گاز جهت بالا بردن دمای نفت خام استفاده می­ کند، به علت خوردگی چندین مرتبه تعویض شده است. اسید نفتنیک و کلراید از جمله مهمترین مواد خورنده در فرآیند پالایش نفت خام هستند. به وسیله شبیه‌سازی با نرم­افزار HTRI، دمای سطح لوله‌ها در گذرهای لوله مبدل حرارتی محاسبه شد. سپس، امکان همپوشانی دمای محاسبه‌شده نرم­افزار HTRI با محدوده دمای خطر خوردگی اسید نفتنیک در استاندارد 581 API بررسی شده است. طبق استاندارد 581 API، فولاد‌ زنگ­نزن L316 حاوی حداقل 2/5 درصد مولیبدنیوم جهت جلوگیری از خوردگی برای لوله­ های مبدل حرارتی پیشنهاد می­شود. مولیبدنیوم لایه محافظ را تثبیت کرده و مقاومت به خوردگی حفره‌ای را افزایش می­ دهد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Investigation of Naphthenic Acid and Chloride Corrosion in the Crude Oil Preheat Exchanger According to API 581 Standard

نویسندگان English

Alireza Mohebbi
Jamal Bagheri
Senior Refining Operations Operator, Shiraz Refinery, Shiraz, Iran
چکیده English

In the crude oil preheat network of the Shiraz refinery, the tube bundle of a heat exchanger that uses gasoil to raise crude oil temperature has been replaced several times due to corrosion. Naphthenic acid and chloride are widely recognized as dominant corrosive species in crude oil refining processes. Using HTRI simulation, the skin temperature of the tubes in heat exchanger tube passes were calculated. Then, an assessment was conducted to determine whether the HTRI-calculated temperatures overlap with the naphthenic acid corrosion susceptibility range defined in API 581. According to API 581 standard, 316L stainless steel containing at least 2.5% molybdenum is recommended for heat exchanger tubes to improve corrosion resistance. Molybdenum stabilizes the protective layer and increases the resistance to pitting corrosion.

کلیدواژه‌ها English

Corrosion
Naphthenic Acid
Chloride
API 581 Standard
Molybdenum
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