Thermoeconomic Performance Analysis of Steam Boilers of a Power Plant Operating with Various Fuels

Öz

Energy consumption is one of the most concerned topics of the industry, and the cost of energy represents a large proportion of operating expenditure for energy-intensive sectors. In the analysis and design of industrial processes, mainly thermodynamics is often used with economic principles to obtain the optimum design for energy-efficient systems. The performance of the system can be analyzed via applying the conservation principles of energy that is defined by the first law of thermodynamics. However, only regarding the conservation of energy is not sufficient to determine the real performance of the system. At this point, an exergy analysis is done to predict the useful part of the energy, also to provide the magnitudes and places of the irreversibilities and losses within the system. Moreover, the thermoeconomic analysis is done for providing useful information to design and operate a cost-effective system. In this study, the thermoeconomic analysis of the steam boilers in a power plant was performed. The simulations of the steam boilers were done by using the Aspen HYSYS simulation software. The mass, energy and cost balance equations were obtained for the boilers to determine the effect of various fuels on the process economics.

Anahtar Kelimeler

• Energy,Exergy,Thermoeconomic Analysis,Steam Boiler,Simulation

Çeşitli Yakıtlarla Çalışan Bir Santralin Buhar Kazanlarının Termoekonomik Performans Analizi

Öz

Enerji tüketimi, endüstrinin en önemli konularından biridir ve enerji maliyeti, enerji yoğun sektörler için işletme giderlerinin büyük bir bölümünü oluşturur. Endüstriyel proseslerin analizinde ve tasarımında, enerji verimli bir sistem için en uygun tasarımı elde etmek üzere temel olarak termodinamik ve ekonomik prensipler birlikte kullanılır. Sistemin performansı, termodinamiğin birinci yasası tarafından tanımlanan enerji korunumu prensipleri uygulanarak analiz edilebilir. Ancak, sadece enerji korunumu prensibi sistemin gerçek performansını belirlemek için yeterli değildir. Bu noktada, enerjinin yararlı kısmının belirlenmesi için ekserji analizi yapılır, ayrıca sistem içindeki tersinmezliklerin ve kayıpların büyüklüklerini ve yerleri de belirlenir. Buna ilaveten, maliyet-etkin bir sistem tasarlamak ve işletmek üzere faydalı bilgi sağlamak için termoekonomik analiz yapılır. Bu çalışmada, bir santralin buhar kazanlarının termoekonomik analizi gerçekleştirilmiştir. Buhar kazanlarının simülasyonları Aspen HYSYS simülasyon yazılımı kullanılarak yapılmıştır. Kazanlar için kütle, enerji ve maliyet dengesi denklemleri çeşitli yakıtların proses ekonomisi üzerindeki etkisini belirlemek üzere elde edilmiştir.

Anahtar Kelimeler

• Enerji,Ekserji,Termoekonomik Analiz,Buhar Kazanı,Simülasyon

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