شبیه سازی واحد تصفیه آب ترش در پالایشگاه نفت با در نظر گرفتن جداسازی آمونیاک

نوع مقاله : مقاله شیمی

نویسندگان

دانشکده مهندسی شیمی، دانشگاه آزاد اسلامی واحد اهر، اهر، ایران

چکیده

در این پژوهش به بررسی واحد آب ترش و شبیه­سازی آن و همچنین امکان جداسازی آمونیاک پرداخته شد. واحد آب ترش پالایشگاه­ها معمولا دارای دو برج عریان­سازی به صورت سری می­باشد. نتایج این مطالعه نشان داد که با افرایش میزان جریان حجمی خوراک آب ترش ورودی، جریان مولی NH3 در گازهای خروجی از برج اول افزایش می­یابد. با افزایش دمای خوراک جزمولی NH3 و H2S تا دمای 105 درجه سلسیوس تغییر چندانی نمی­کند و بعد از آن با افزایش دما، جزمولی این دو ماده در گازهای خروجی کاهش پیدا می­کند. با افزایش رفلاکس به برج اول تا حدودm3/hr   9 به شدت میزان جریان مولی گاز NH3 در برج اول کاهش می­یابد که در واقع باعث افزایش خلوص H2S در گازهای خروجی این برج و افزایش جریان این جز در گازهای خروجی از برج دوم می­شود. همچنین،  با افزایش دمای انتهای برج،  جریان مولی NH3 و H2S افزایش می­یابد و در دمای حدود 120 درجه تمامی H2S  موجود در خوراک وارد گازهای خروجی از برج اول شده و آب خروجی از برج اول عاری از H2S می­شود که در نتیجه می­توان نتیجه گرفت که بهترین دما برای ته برج اول حدود 120 درجه سلسیوس می­باشد تا هم تمامی H2S از آب خارج شود و همچنین در برج اول NH3 بیشتر وارد گازهای خروجی از برج نشود .

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Simulation of Sour Water Stripping Unit in Oil Refinery with Consideration of Ammonia Separation

نویسندگان [English]

  • Hassan Shahidi
  • Mehrab Fallahi
Department of Chemical Engineering, Ahar Branch, Islamic Azad University, Ahar, Iran
چکیده [English]

In this research, the sour water unit and its simulation were investigated. Sour water unit of refineries usually has two stripping towers in series. The results of this study showed that with the increase in the volumetric flow rate of the incoming sour water feed, the molar flow of NH3 in the exit gases from the first tower increases. With increasing feed temperature, the NH3 and H2S do not change much until the temperature of 1050C, and after that, the relative molarity of these two substances in the exhaust gases decreases with increasing temperature. By increasing the reflux to the first tower to about 9 m3/hr, the molar flow rate of NH3 gas in the first tower decreases drastically, which actually increases the purity of H2S in the exit gases of this tower and increases the flow of this component in the exit gases from the second tower. Also, with the increase in the temperature of the end of the tower, the flow of NH3 and H2S increases and at a temperature of about 120 0C, all the H2S in the feed enters the exit gases from the first tower and the exit water from the first tower is free of H2S. As a result, it can be concluded that the best temperature for the bottom of the first tower is about 120 0C so that all the H2S is removed from the water and NH3 does not enter the gases leaving the tower in the first tower.

کلیدواژه‌ها [English]

  • Simulation
  • Sour water
  • Hydrogen sulfide
  • Ammonia
  • Oil refinery

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مدل سازی در مهندسی
دوره 22، شماره 79
در حال تکمیل شدن
دی 1403
صفحه 59-77

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سابقه مقاله

  • تاریخ دریافت: 29 مهر 1402
  • تاریخ بازنگری: 26 خرداد 1403
  • تاریخ پذیرش: 03 تیر 1403

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