مهندسی شیمی ایران

مهندسی شیمی ایران

ارزیابی بازیابی حرارت اتلافی در کورۀ دوار فرایند کلسینه‌کردن منیزیت

نوع مقاله : مقاله پژوهشی

نویسندگان
1 کارشناسی ارشد مهندسی شیمی، دانشگاه سیستان‌وبلوچستان
2 استاد مهندسی شیمی، دانشگاه سیستان‌وبلوچستان
3 استادیار مهندسی شیمی، دانشگاه سیستان‌وبلوچستان
چکیده
در این پژوهش به بررسی بازیابی حرارت اتلافیاز پوسته و گازهای خروجیاز دودکش کورۀ دوار کلسینه‌کردن کربنات منیزیم مجتمع تهیهوتولید مواد نسوز کشور پرداخته‌شده‌است. میزان حرارت اتلافیاز کورۀ دوار معادل 565/82کیلو‌وات است. در طرح پیشنهادی اول، با قراردادن چندین لوله به‌صورت مبدل حرارتی در اطراف پوستۀ کوره از حرارت اتلافی برای گرمایش ساختمانهای واحد استفاده‌شد. براورد اقتصادی نشان‌داد که هزینۀ موردنیاز طرح در طول 6 سال صرفه‌جویی در مصرف گازوییل جبرانمی­شود. با حذف گازوییل مصرفی برای گرمایش در فصل زمستان، علاوه‌بر کاهش آلودگی‌های محیط زیستی، هزینه‌های واحد کاهش چشم‌گیری می‌پذیرد. در طرح پیشنهادی دوم، حرارت اتلافی گازهای خروجیاز دودکش کوره بااستفاده‌از چرخۀ رانکین1 (RC) درحضور سیالهای عامل آمونیاک و آب برای تولید برق مورد نیاز واحد استفاده‌شد. شبیه‌سازی چرخه بااستفاده‌از نرم‌افزار Aspen Hysys انجامگرفت. نتایج نشان‌داد که میزان برق تولیدشده در چرخه در هر 24 ساعت شبانهروز با سیال عامل آمونیاک برابر 734/9 کیلووات و درحضور سیال عامل آب برابر 115/37 کیلووات است. ازطرفی، هزینۀ تولید برق با سیال آمونیاک 33.750 تومان بر کیلووات ساعت و با سیال آب 285.000 تومان بر کیلووات ساعت است. بررسی نتایج نشان‌داد که از جنبۀ بهره­وری انرژی، بهره­وری اکسرژی و هم‌چنین هزینۀ برق تولیدی، سیال آمونیاک نسبت‌به سیال عامل آب برای واحد مذکور مناسب‌تر است
کلیدواژه‌ها

عنوان مقاله English

Investigation of Effective Factors in Reducing Energy Consumption of Magnesium Carbonate Calcination Process

نویسندگان English

.M Siyadat 1
.F Shahraki 2
.B Bidar 3
M. R. Sardashti Birjandi 3
1 MSc. of Chemical Engineering, University of Sistan and Baluchestan
2 Professor of of Chemical Engineering, University of Sistan and Baluchestan
3 Assistant Professor of Chemical Engineering, University of Sistan and Baluchestan
چکیده English

This study focuses on the recovery of waste heat from the shell and exhaust gases of the rotary kiln used for calcining magnesium carbonate at the Iranian Refractories Procurement Production Complex.
The amount of waste heat from the rotary kiln was calculated to be 565.82 kW. In the first proposed scenario, several heat exchanger tubes were installed around the kiln shell to utilize the waste heat for heating the unit's buildings. An economic analysis revealed that the investment cost of this design could be recovered within six years through savings in diesel fuel consumption. Eliminating diesel fuel usage for winter heating not only reduces environmental pollution but also significantly decreases the unit’s operational costs. In the second proposed scenario, the waste heat from the kiln's exhaust gases was utilized for electricity generation via a Rankine cycle (RC) employing ammonia and water as working fluids. The cycle was simulated using Aspen HYSYS software. The results showed that the electricity generated in the Rankine cycle over a 24-hour period was 734.9 kW using ammonia as the working fluid, and 115.37 kW using water as the working fluid. Furthermore, the cost of electricity generation was 33,750 Toman per kWh for ammonia and 285,000 Toman per kWh for water. A comparative analysis demonstrated that ammonia, in terms of energy efficiency, exergy efficiency, and electricity production cost, is a more suitable working fluid for this application compared to water.

کلیدواژه‌ها English

Calcination
Magnesite
Rotary Kiln
Heat Loss
Flue Gas
Rankine Cycle

 

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