Kombine çevrim santrali için karbon yakalama ünitesinin tasarımı ve performans değerlendirmesi

Öz

Karbondioksit yakalama sistemlerinin doğması, İklim Değişikliğini azaltmanın etkili bir yolu olarak küresel sera gazı emisyonları konusunda artan endişelerden kaynaklanmaktadır. Bu çalışma, Irak, Bağdat'taki Elektrik Santrali'nden (Bismayah) karbondioksitin (CO2) uzaklaştırılmasını test etmektedir. Santral, altı aşamadan oluşmaktadır; her aşama 750 MW, toplam 4500 MW güç üretimi üretmektedir ve doğal gaz kombine çevrim sistemiyle çalışmaktadır. Karbon yakalamanın santralin verimliliği ve güç üretimi üzerindeki etkisi de incelenmektedir. Aminlerin emilim ve adsorpsiyon ünitelerine dayanan yanma sonrası bu yöntem, karbon yakalamadaki yüksek verimliliği nedeniyle en yaygın kullanılan yöntemlerden biri olarak kabul edilmektedir. Çalışma Thermo-flow ve Aspen HYSYS 14 yazılımı® kullanılarak yürütülmüştür. Çalışma, santralden okyanusa salınan karbondioksit miktarının her bir aşama için ortalama 2,26 (Mt CO2/yıl) değerine sahip olduğu sonucuna varmıştır. Toplam salınan CO2 miktarı yaklaşık 14 Mt CO2/yıl olarak tahmin edilebilir. Ancak, %90 yakalama verimliliğine sahip bir karbon yakalama ünitesinin eklenmesi, kombine çevrimin elektrik üretim verimliliğini %14 ve net güç azalmasını %13,6 oranında azaltacaktır. Ancak, uygulanan prosedürün faydası, birim başına yıllık karbondioksit konsantrasyonunun 0,226'ya (Mt CO2) düşecek olmasıdır. Karbon yakalama ile ve olmadan üretilen birim elektrik başına ilgili özgül emisyonlar sırasıyla ortalama 40,6 g CO2/kWh ve 376,85 g CO2/kWh'dir.

Anahtar Kelimeler

• Thermoflow
• CO2 giderimi
• Monoetanolamin
• Absorpsiyon
• Ayırıcı.

Design and performance evaluation of a carbon capture unit for a combined cycle power plant

Öz

The study of carbon dioxide capture systems arises from increasing concerns about global greenhouse gas emissions as an effective way to mitigate Climate Change. This study analyses the removal of carbon dioxide (CO2) from the Power Plant (Bismayah) in Baghdad, Iraq. It comprises six stages; each stage produces 750 MW, a total power generation of 4500 MW, and operates on a natural gas combined cycle system. The effect of carbon capture on the efficiency and power generation of the plant is also being studied. The post-combustion method, which depends on the absorption and adsorption units of amines, is considered one of the most widely used methods due to its high efficiency in carbon capture. The study was conducted using the Thermo-flow and Aspen HYSYS 14 software®. The study concluded that the amount of carbon dioxide released to the ocean from the plant has an average value of 2.26 (Mt CO2/yr) from each stage. The total released CO2 quantity can be estimated as approximately 14 Mt CO2/yr. However, adding a carbon capture unit with a capture efficiency of 90 % will reduce the electricity production efficiency of the combined cycle by 14% and the net power decrease by 13.6%. However, the benefit of the applied procedure is that annual carbon dioxide concentration per unit will decrease to 0.226 (Mt CO2). The respective specific emissions per produced electricity with and without carbon capture are 40.6 g CO2 / kWh and 376.85 g CO2/kWh.

Anahtar Kelimeler

• Thermoflow®
• CO2 removal
• Monoethanolamine
• Absorption
• Separator.

Kaynakça

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