بررسي فني و اقتصادي بازيافت اكسرژي فشاري تلف شده از شير فشارشكن در چاه هاي گازي

در اين مقاله با استفاده از يك مدل برنامه ريزي رياضي به كمك نرم افزار شبيه ساز Hysys و بهينه ساز Gamsبه بررسي فني و اقتصادي يك چاه گازي از نظر بازيافت اكسرژي تلف شده در شير فشارشكن به منظور توليد توان الكتريكي با استفاده از توربين انبساطي پرداخته شده است. نتايج براي چاه گازي شماره 1 ميدان گازي كيش نشان مي دهدكه با بكار گيري اين سيستم در محدوده فشاري 4850 تا 1850 پوند بر اينچ مربع بين 48 تا 74 درصد اكسرژي فشاري گاز بازيافت مي شود. توان الكتريكي توليدي نيز بين 2698 تا 560 كيلووات مي باشد كه فراتر از نياز تاسيسات سر چاهي در طول دوران بيست سال بهره برداري است. از نظر اقتصادي نيز نرخ بازگشت سرمايه 38 درصد بوده كه نشان دهنده جذابيت بالاي سرمايه گذاري در اين زمينه است.

In this article the application of a turbo expander in a gas well has been studied technically economically and thermodynamically for the purpose of recycling the wasted exergy in a chock valve, reducing the gas pressure as well as generating huge amount of electrical power through a generator are among the advantages of applying an expansion turbine instead of chock valve. On the other hand this method is a clean method of energy production since no fuel is consumed for and no environmental pollution is caused through this method .In this thesis two software HYSYS and GAMS have been applied to calculate the productivity power in various pressure ranges and mass flow rate in different years of extractions when expansion turbine are used. Considering the necessary power of an infrastructure this system of calculation helps to determine the maximum life span of an expansion turbine in a gas well. This project is aimed at technical and economical planning and optimization of a mechanical package to recycle the pressure exergy of a gas well inlet chock valve in order to generate the electrical power both for the consumption of the infrastructure itself and for selling the extra amount.In administrating this project not only would the gas wells of the country become needless of electrical power but also the super flues amount at electricity could be sold to the national electricity network . Financial studies indicate that the capital returning period in this project for pressure range of 1850 – 4850 psig and mass flow rate of 21.2 kg/s at prices of 1600 $ per kilowatt hour and 0.12 $ per kilowatt hour for constructing a power station and the value of generated electricity respectively is estimated almost 3.5 years which economically appears really fascinating for the purpose of investment