Energy and Exergy Analysis of Green Hydrogen Production

Year 2025, Volume: 28 Issue: 2, 461 - 468

Pinar Büyük , Ahmet Eryaşar

https://doi.org/10.2339/politeknik.1206392

Abstract

Biomass pyrolysis and gasification are recognized as effective thermal technologies for producing green hydrogen obtained through thermal conversion from biomass. This research paper presents a comparatmive analysis of the energy and exergy performance of pyrolysis and gasification systems. The study investigates two critical process conditions: low-temperature pyrolysis at 500°C and high-temperature gasification at 900°C. The analysis integrates thermodynamic equilibrium calculations and modeling to produce hydrogen and offers a comprehensive evaluation of energy and exergy efficiencies. The comparison is carried out between a downdraft gasifier and a pyrolysis process, both employing wood chips as the biomass feedstock. This paper delves into the energy and exergy yields of these distinct thermal conversion methods for energy production. The research identifies pyrolysis at 900°C as the optimal model condition due to its lower energy consumption and the absence of agent materials. Energy and exergy analyses are conducted at both 500°C and 900°C for all processes. The model results demonstrate that pyrolysis yields 60% energy at 500°C and 94% at 900°C. Furthermore, the study reports on the effects of temperature variations on energy and exergy yields. This study contributes to the examination of the performance of thermal conversion methods from biomass for green hydrogen production.

Keywords

: Biomass Gasification, Equilibrium model, Pyrolysis, Energy and exergy analysis, Hydrogen Production

Yeşil Hidrojen Üretiminde Enerji ve Ekserji Analizi

Abstract

Biyokütleden termal dönüşüm yöntemi ile elde edilen yeşil hidrojen üretimi için biomass piroliz ve gazifikasyon, sürdürülebilir hidrojen üretimi için etkili termal teknolojiler olarak kabul edilmektedir. Bu araştırma makalesi, piroliz ve gazifikasyon sistemlerinin enerji ve ekserji performansını karşılaştırmalı bir analizini sunmaktadır. Çalışma, düşük sıcaklıkta 500°C'de piroliz ve yüksek sıcaklıkta 900°C'de gazifikasyon olmak üzere iki kritik işlem koşulunu incelemektedir. Analiz, termal denge hesaplamaları ve modellemelerini içeren bir yöntem kullanarak hidrojen üretimini gerçekleştirir ve enerji ve ekserji verimliliğini kapsamlı bir şekilde değerlendirir. Karşılaştırma, biyokütle malzemesi olarak odun yongalarını kullanan bir downdraft gazifikasyon ünitesi ile piroliz işlemi arasında gerçekleştirilir. Bu makale, enerji üretimi için bu farklı termal dönüşüm yöntemlerinin enerji ve ekserji verimini detaylı olarak incelemektedir. Araştırma, düşük enerji tüketimi ve ajan malzeme kullanımının olmaması nedeniyle 900°C'de pirolizin en iyi model koşul olduğunu belirler. Tüm işlemler için hem 500°C hem de 900°C'de enerji ve ekserji analizleri gerçekleştirilir. Model sonuçları, piroliz işleminin 500°C %60 enerji verimi sağladığını ve 900°C'de %94 enerji verimi sağladığını göstermektedir. Ayrıca, çalışma sıcaklığındaki değişikliklerin enerji ve ekserji verimine etkileri de raporlanmıştır. Bu çalışma, yeşil hidrojen üretimi için biyokütleden termal dönüşüm yöntemlerinin performansını inceleyen bir katkı sunmaktadır.

Keywords

Biyokütle Gazlaştırma, Denge Modeli, Piroliz, Enerji ve Ekserji Analizi, Hidrojen Üretimi

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