Doğalgaz Yakıtlı Bir Kombine Çevrim Santralinin Enerji ve Ekserji Analizi: Parametrik Çalışma

Nükleer, biyoyakıtlar ve yenilenebilir enerji kaynaklarının enerji üretimindeki kullanımları gün geçtikçe artsa da enerji üretiminde fosil yakıt kullanımı yaygın olarak devam etmektedir. Fosil yakıtların daha verimli bir şekilde kullanılmasını sağlayan en iyi seçeneklerin başında kombine çevrim santralleri gelmektedir. Brayton ve Rankine çevrimlerinin birleştirilmesinden oluşan bu santraller bir taraftan fosil yakıtları daha verimli kullanırken, diğer yandan çevreye daha az zarar vermektedir. Bu çalışmada doğalgazla çalışan bir kombine çevrim santralinin enerji ve ekserji analizleri, santralin gerçek operasyon verileri kullanılarak gerçekleştirilmiştir. Ortam sıcaklığının ve basıncının sırasıyla 25,4 °C ve 98,1 kPa olduğu şartlarda gerçekleştirilen analizler sonucunda, santralin ekserji verimi % 61,2 olarak bulunurken, en yüksek ekserji kaybına sahip olan bileşen 89 MW ile yanma odası olmuştur. Ekserji verimi en yüksek santral bileşeni ise % 96,4 ile yoğuşturucu olarak tespit edilmiştir. Santralden elde edilen toplam güç 205 MW olarak hesaplanırken Brayton çevriminin gücü 134 MW, Rankine çevriminin gücü 71 MW olarak hesaplanmıştır. Ortam sıcaklığı ile gaz türbini giriş sıcaklığının arttırılmasının etkileri bu çalışmada ayrıca incelenmiştir.

Anahtar Kelimeler:

Enerji, ekserji, kombine çevrim santrali, Brayton çevrimi, Rankine çevrimi

Energy and Exergy Analyses of a Natural Gas Fired Combined Cycle Power Plant: Parametric Study

Despite the increasing use of nuclear, biofuels, and renewable energy sources in energy production, the use of fossil fuels in energy production continues widely. Combined cycle power plants are among the best options that enable the more efficient use of fossil fuels. These power plants, which use a combination of the Brayton and Rankine cycles, use fossil fuels more efficiently while also cause less environmental damage. In this study, energy and exergy analysis of a natural gas-fired combined cycle power plant was carried out using the actual operational data of the power plant. The exergy efficiency of the power plant was determined to be 61.2 % as a result of the analyses performed under conditions where the ambient temperature and pressure were 25.4 °C and 98.1 kPa, respectively, while the component with the highest exergy destruction was the combustion chamber with 89 MW. The condenser was determined to be the most exergy efficient component of the power plant, with a 96.4 % efficiency rating. While the total power obtained from the power plant is 205 MW, the power of the Brayton cycle is 134 MW and the power of the Rankine cycle is 71 MW. In this study, the effects of increasing the ambient temperature and the gas turbine inlet temperature were also investigated.

Keywords:

Energy, exergy, combined cycle power plant, Brayton cycle, Rankine cycle,

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