پژوهش های کاربردی مهندسی شیمی - پلیمر
فصلنامه علمی - پژوهشی

کنترل پدیده طغیان در برج تقطیر سینی دار تحت خلاء با استفاده از پارامترهای عملیاتی و آزمایشگاهی

نوع مقاله : پژوهشی اصیل

نویسندگان

حسین پیروان 1
محمد جواد صراف شیرازی 2
علیرضا ایلخانی 3
علی شیبانی 3
سعیده هاشمیان 3

1 دانشجوی دکتری رشته مهندسی شیمی- دانشگاه آزاد یزد

2 عضو هیئت علمی دانشگاه یزد

3 عضو هیئت علمی دانشگاه آزاد یزد

چکیده
در این تحقیق وقوع پدیده طغیان به علت تجمع رسوبات در ناحیه ناودانی که منجر به افزایش بیش از حد مایع روی سینی های بالایی برج تقطیر شده بود در یک پالایشگاه مورد بررسی قرار گرفت.

فشار خلاء در ناحیه بالای برج، دبی آب تغذیه بویلر ورودی به کندانسور و دبی محصول خالص خروجی به عنوان سه پارامتر عملیاتی بسیار مهم و تأثیر گذار در کنترل شدت پدیده طغیان و نیز میزان کُک به عنوان یک پارامتر آزمایشگاهی مهم برای کاهش حجم رسوبات ورودی به برج تقطیر مد نظر قرار گرفت. داده ها و نتایج حاصل از تغییرات انجام شده بر روی هر یک از این سه پارامتر عملیاتی نشان دهنده موثر بودن آنها در کنترل شدت وقوع طغیان بود. به منظور کنترل و کاهش مشکلات ناشی از پدیده طغیان همزمان دور پمپ خلاء، دبی آب تغذیه بویلر ورودی به کندانسور و دبی محصول خالص خروجی تا نرمال شدن شرایط عملیاتی برج تقطیر به تناسب افزایش داده شد.

در این تحقیق چگونگی کنترل پدیده طغیان و کاهش اثرات نامطلوب ناشی از آن به دلیل تجمع رسوبات در ناحیه ناودانی سینی شماره 22 و بالاتر از آن مورد بررسی قرار گرفت. برای غلبه بر این مشکلات ابتدا دور پمپ خلاء از rpm850 به rpm1250 و دبی آب تغذیه بویلر ورودی به کندانسور از m3/hr 1.95 به m3/hr 3.2 افزایش داده شد. از طرفی به منظور جلوگیری از آلوده شدن محصول خالص، دبی محصول خالص خروجی نیز از kg/hr 925 تا kg/hr 2300 افزایش یافت. همچنین با کنترل منظم و دقیق شاخص میزان کُک به عنوان یک پارامتر آزمایشگاهی بسیار مهم، حجم روسبات کُک موجود در خوراک قطران زغال سنگ ورودی به برج تقطیر پس از یک مرحله سانتریفیوژ در بازه زمانی 30 روزه از مقدار 37.5 درصد وزنی به 18.4 کاهش یافت.

کلیدواژه‌ها

قطران زغال سنگ
پدیده طغیان
آب تغذیه بویلر
فشار خلاء
شاخص میزان کُک

موضوعات

عنوان مقاله English

Control of flooding phenomena in vacuum distillation tray column using operational and laboratory parameters

نویسندگان English

hosein peiravan 1
Mohammad Javad Shirazi Sarraf 2
Ali Reza Ilkhani 3
Ali sheibani 3
Saeedeh Hashemian 3
1 PhD student in Chemical Engineering - Yazd Azad University
2 Faculty member of Yazd University
3 Faculty member of Yazd Azad University
چکیده English

Research subject: In this study, the occurrence of flooding due to the accumulation of sediment in the downcomer area, which led to an excessive increase in liquid on the upper trays of the distillation column was investigated in a refinery.

Research approach: Vacuum pressure in the upper area of the column, boiler feed water flow from the inlet to the condenser and the discharge of the net product as three very important and effective operational parameters in controlling the severity of the flooding phenomena and the amount of coking value as an important laboratory parameter to reduce the volume of inlet sediments entering the distillation column. Data and results of changes made on each of these three operational parameters showed their effectiveness in controlling the severity of the flooding phenomena.

Main results: In order to control and reduce the problems caused by the simultaneous flooding phenomena around the vacuum pump, the boiler feed water flow of the inlet to the condenser and the flow of the net output product were proportionally increased until the operating conditions of the distillation column are normalized. In this study, how to control the flooding phenomena and reduce the adverse effects due to the accumulation of sediments in the downcomer area of tray No. 22 and above was investigated.

To overcome these problems, first the vacuum pump rotation speed was increased from 850 rpm to 1250 rpm and the boiler feed water inlet to the condenser from 1.95 m3/hr to 3.2 m3/hr was increased. On the other hand, in order to prevent contamination of the pure product, the net output product flow rate also increased from 925 kg/hr to 2300 kg/hr. Also, with regular and accurate control of the coking value index as a very important laboratory parameter, the volume of coke sediments in the coal tar feed entering the distillation column was reduced from 37.5% by weight to 18.4% in a 30-day period after centrifugation.

کلیدواژه‌ها English

Coal tar
Flooding phenomena
Boiler feed water
Vacuum pressure
Coking value index
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