شرکت آذر انرژی تبریز در راستای اهداف خود مبنی بر تولید علم و بومی سازی تکنولوژی های انحصاری با همکاری دانشگاههای داخل کشور اقدام به تحقیقات در مورد سینی های غربالی نموده و با بررسی مشکلات فرآیندی به وجود آمده در این نوع سینی ها ، مشکل رسوب گذاری سینی های غربالی را با ایجاد تغییرات کوچک حل نموده است و باعث افزایش بازدهی این نوع سینی ها قرار گرفته است .
برآیند این تلاش ها در قالب مقاله ای فراهم گردیده و در کنفرانس بین المللی Distillation 2010 هلند مورد قبول هئیت داوران قرار گرفت ودر سپتامبر 2010 این مقاله ارائه گردید .
همچنین مقاله ای دیگر از این شرکت که مورد قبول هئیت داوران قرار گرفته بود به صورت پوستر دیواری در معرض نمایش قرار گرفت .
OR31 Rahimi A Computational Fluid Dynamics and Experimental - AZAR ENERGY CO
Distillation Absorption 2010 A.B. de Haan, H. Kooijman and A. Gorak (Editors) All rights reserved by authors as per DA2010 copyright notice
A COMPUTATIONAL FLUID DYNAMICS AND AN EXPERIMENTAL APPROACH TO THE EFFECTS OF PUSH VALVES ON SIEVE TRAYS
Rahbar Rahimi1, Ali Zarei1, Taleb Zarei1, Hamed Naziri Firoozsalari2, Mortaza Zivdar1 1Chemical Engineering Department, University of Sistan and Baluchestan, Zahedan, P.OBox.98164-161, Iran, Rahimi@hamoon.usb.ac.ir
Research and Development center, Azar Energy Co., Tabriz, Iran, info@azarenergy.com
Abstract
In this study to improve hydraulic performance of sieve tray, push valves have been utilized on the sieve tray deck. The hydraulic effects have been investigated using computational fluid dynamics simulation and experimentation. The computational fluid dynamics (CFD) model used 1.213 m diameter Solari and Bell [1] sieve tray. In the CFD model it is found that the ratio of the push valves' open area to the total hole area is approximately 14.31% which is considered as a design parameter. The experimentally investigated sieve tray had 7.039 % hole area and 32 push valves. The ratio of push valves' open area to the total hole area was 14.59%. The dry pressure drop, total pressure drop and weeping were measured. The experimental results of this modified sieve tray and the sieve tray without push valves were compared with each other. Results show that better hydrodynamic behavior of the modified push valve sieve tray than conventional sieve tray.
Key words: sieve tray, push valves, pressure drop, weeping, CFD
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PO38 Zarei A Study on Sieve Tray Lower Operating Limit- AZAR ENERGY CO
Distillation Absorption 2010
A.B. de Haan, H. Kooijman and A. Gorak (Editors)
All rights reserved by authors as per DA2010 copyright notice
A STUDY ON SIEVE TRAY LOWER OPERATING LIMIT
Ali Zarei1, Rahbar Rahimi1, Taleb Zarei1, Nader Naziri2
1Chemical Engineering Department, University of Sistan and Baluchestan, Zahedan,
P.OBox.98164-161, Iran, Rahimi@hamoon.usb.ac.ir
2Managing Director, Azar Energy Co., Tabriz, Iran, www.azarenergy.com
Abstract
Sieve trays are widely used fractionating devices in separation and purification industries involving tray towers. According to the importance of trays, it is vital to predict lower operating range limits for such gas-liquid contacting devices. Weeping phenomenon observed in bubbling regime and occurs at low vapor flow rates. The experimental set up includes a 1.22 m diameter column with two test trays and two chimney trays. Hydraulic parameters and weeping rates were measured in sieve trays with 7.04 percent holes area. The model considers the tray's thickness and is able to calculate the dry tray pressure drop, total pressure drop, clear liquid height, froth height, and weeping rate simultaneously. Predicted results were in good agreement with the experimental data. This model is able to predict the trend of weeping even in higher rates where efficiency is reduced significantly.
Key words: sieve tray, hydrodynamic, weeping, CFD
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