Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 32, No. 5 (May 2019) 777-789   

PDF URL: http://www.ije.ir/Vol32/No5/B/20-3091.pdf  
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  VARIOUS APPROACHES TO THERMODYNAMIC OPTIMIZATION OF A HYBRID MULTI-EFFECT EVAPORATION WITH THERMAL VAPOUR COMPRESSION AND REVERSE OSMOSIS DESALINATION SYSTEM INTEGRATED TO A GAS TURBINE POWER PLANT
 
S. E. Shakib, M. Amidpour, A. Esmaieli, M. Boghrati and M. M. Ghafurian
 
( Received: December 14, 2018 – Accepted in Revised Form: March 07, 2019 )
 
 

Abstract    This paper investigates the simulation of a hybrid desalination system composed of multi-effect evaporation with thermal vapour compression desalination (METVC) and reverse osmosis (RO) plant. The hybrid desalination system is also integrated with a gas turbine power plant through a heat recovery steam generator (HRSG). First, a comprehensive Thermodynamic model for HRSG, METVC, and RO are developed for predicting thermal behaviour of hybrid desalination system. Depending on the interconnection between input and output streams of METVC and RO, six configurations are proposed, and their results are compared in two different scenarios. In the first scenario, METVC desalination production is fixed at its maximum capacity of 70000 m3/day. The heat potential of power plants is fully extracted at maximum capacity of production of METVC. In the second scenario, METVC desalination production is not fixed. The limitation on the total production of the desalination plant (METVC+RO) is imposed as a constraint to the optimization problem. The results show that, regardless of the scenario under consideration, cconfiguration 1(the outlet water of the cooling system in METVC has been used for the feed water of the RO system) has the minimum energy consumption as well as maximum exergy efficiency.

 

Keywords    Optimal Design; Multi-effect Evaporation with Thermal Vapour Compression; Reverse Osmosis; Desalination; Thermodynamic Approach

 

چکیده   

این مقاله به شبیه‌سازی سیستم آب‌شیرین‌کن ترکیبی شامل آب‌شیرین‌کن تبخیری چند مرحله با تراکم گرمایی بخار و آب شیرین اسمز معکوس می‌پردازد. سیستم آب‌شیرین‌کن ترکیبی مورد نظر از طریق بویلر بازیاب به یک نیروگاه توربین گازی متصل است. ابتدا مدل ترمودینامیکی جامع از بویلر بازیاب، آب‌شیرین‌کن تبخیری چند مرحله‌ای و آب‌شیرین‌کن اسمز معکوس توسعه یافت تا بتوان توسط آن رفتار گرمایی آب‌شیرین‌کن ترکیبی را پیش‌بینی نمود. بسته به نحوه اتصال دو آب‌شیرین‌کن مذکور که به ارتباط بین جریان‌های ورودی و خروجی آن‌ها ارتباط دارد شش چیدمان برای سیستم آب‌شیرین‌کن ترکیبی پیشنهاد شد. این شش چیدمان با دو رویکرد مختلف مورد مطالعه قرار گرفت. در رویکرد اول ظرفیت تولید آب شیرین در آب‌شیرین‌کن گرمایی چند مرحله ثابت و به مقدار 70000 مترمکعب در روز در نظر گرفته شد. در واقع در این رویکرد از کل پتانسیل گرمایی گازهای داغ خروجی از توربین گاز برای تولید آب شیرین استفاده شد. در رویکرد دوم، ظرفیت تولید آب‌شیرین‌کن گرمایی چند مرحله‌ای متغیر در نظر گرفته شد و محدودیت تولید آب شیرین بر مجموع تولید دو آب‌شیرین‌کن مورد مطالعه به عنوان قید بهینه‌سازی اعمال شد. نتایج نشان داد در هر دو رویکرد چیدمان اول (چیدمانی که در آن از آب خنک‌کن آب‌شیرین‌کن گرمایی به عنوان آب تغذیه واحد اسمز معکوس استفاده شده است) کمترین مصرف انرژی و بالاترین راندمان اگزرژی را داراست.

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