BACA GAZI DESTEKLİ ORGANİK RANKİNE ÇEVRİMLERİNİN TERMAL MİMARİLERİ İÇİN PERFORMANS DEĞERLENDİRMESİ

Year 2020, Volume: 40 Issue: 1, 65 - 76, 30.04.2020

Burak Türkan Akın Etemoğlu

Abstract

Düşük ve orta sıcaklıklarda atık ısının etkin kullanımı, enerji sıkıntısı ve çevre kirliliği sorunlarını hafifletmek için çözümlerden biri olarak kabul edilir. Uygulanabilirliği ve güvenilirliği nedeniyle, organik Rankine çevrimi, araştırmacıların ve/veya üreticilerin ilgisini yaygın olarak çekmeye devam etmektedir. Bu makalede, hem enerji hem de ekserji kavramlarına dayanan baca-gazı destekli organik Rankine döngüleri (FGA-ORCs) üzerinde termodinamik ve ekonomik analizler sunulmaktadır. FGA-ORC sisteminin ısı kaynağı, tekstil bitim işleminde çok kullanılan bir ramöz makinasının egzoz baca gazıdır. Bu çalışmada, termal enerjiyi küçük ölçekte elektrik ve/veya mekanik enerjiye dönüştürmek için beş farklı çevrim yapısı kullanılarak optimizasyon çalışması yapılmıştır. İşletme şartlarının verimlilik, ekonomik kar ve performans oranı gibi performans göstergeleri üzerindeki etkisini araştırmak için parametrik çalışmalar yapılmıştır. Son olarak, belli çalışma koşulları altında, ekserji yıkımını azaltan ve artan net iş çıkışı nedeniyle ekonomik karı artıran termal mimari tespit edilmiştir. Bu çalışmada analiz edilen vakalarda, Senaryo - 4 (yani termal yapı 4), termodinamik ve pratik sınırlar içinde %69 ekserji verimliliği ile en iyi sistem performansını göstermektedir.

Keywords

Organik Rankine çevrimi, Atık ısı geri kazanımı, Baca gazı, Enerji analizi, Ekserji analizi

PERFORMANCE EVALUATION FOR THERMAL ARCHITECTURES

Abstract

Effective use of waste heat at low and medium temperatures is considered as one of the solutions to alleviate energy shortages and environmental pollution problems. Due to its feasibility and reliability, the organic Rankine cycle is continued to attract widespread interest from researchers and/or manufacturers. This paper presents thermodynamic and economic analyses on flue-gas assisted organic Rankine cycles (FGA-ORCs) based on both energy and exergy concepts. The heat source of the FGA-ORC system is the exhaust flue-gas of a stenter-frame which is highly used in textile finishing process. In this study, to convert thermal energy into electrical and/or mechanical energy on a small scale, an optimization study was performed using five different cycle architectures. Parametric studies were also carried out to investigate the effect of operating parameters on performance indicators such as efficiency, economical profit and performance ratio. Finally, under specified operating conditions, the thermal architecture was identified that reduces exergy destruction and increases economic profit due to increased net-work output. For analyzed cases in this study, Scenario-4 (i.e., thermal architecture 4) shows the best system performance with 69% exergetic efficiency within the thermodynamic and practical limits.

Keywords

Organic Rankine cycle, Waste-heat recovery, Flue-gas, Energy analysis, Exergy analysis

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