INVESTIGATION OF COMBUSTION CHARACTERISTICS OF BIOGASES OBTAINED FROM FERMENTATION OF ORGANIC WASTES

Yıl 2019, Cilt: 8 Sayı: 1, 418 - 428, 28.01.2019

Murat Şahin

https://doi.org/10.28948/ngumuh.517156

Öz

   In this
study, numerical studies have been carried out on the combustion
characteristics of the biogas obtained from a designed and manufactured biogas
reactor. Gaseous fuel mixtures obtained from the biogas reactor have been
burned in the system integrated a combustion system. Emission and temperature
distributions have been investigated throughout the combustion chamber.
Experimental results obtained from the experimental study have been compared
with numerical results and it has been determined that the predicted results
are in agreement with the experimental results considerably in terms of
temperature distributions. In the numerical modelling, k-Ɛ standard turbulence
model, P-1 radiation model and PDF / Mixture Fraction combustion model have
been used. In the modelling, biogases mixed with 55% CH₄ - 45% CO₂
and 45% CH₄ - 55% CO₂ by volume have been modelled and
the temperature and emission distributions have been predicted by Ansys Fluent
commercial code. The predicted results show that the temperature levels of 45%
CH₄ - 55% CO₂ biogas mixture are lower in the combustion
chamber inlet regions and higher towards the combustion chamber outlet. In CO₂
and H₂O predictions, CO₂ levels and H₂O levels
are higher for the biogas with more CO₂.

Anahtar Kelimeler

Biogas, Combustion, Emission

ORGANİK ATIKLARIN FERMANTASYONU SONUCU ELDE EDİLEN BİYOGAZLARIN YANMA KARAKTERİSTİKLERİNİN İNCELENMESİ

Öz

   Bu çalışmada, tasarlanıp imal edilmiş bir
biyogaz reaktöründen elde edilen biyogazın yanma karakteristikleri hakkında
sayısal çalışmalar yürütülmüştür. Biyogaz reaktöründen elde edilen gaz, sisteme
uyumlu yakma sisteminde yakılarak, yanma sonu emisyon değerleri ve sıcaklık
dağılımları sayısal olarak araştırılmıştır. Yapılan araştırmalarda elde edilen
deneysel sonuçlar, sayısal sonuçlarla karşılaştırılmış olup sıcaklık dağılımı
bakımından önemli derecede uyum olduğu tespit edilmiştir. Sayısal modellemelerde
k-Ɛ standard türbülans modeli, P-1 radyasyon modeli ve PDF/Mixture Fraction
yanma modeli kullanılmıştır. Modellemelerde, hacimce % 55 CH₄ - % 45
CO₂ ve % 45 CH₄ - % 55 CO₂ karışımlı
biyogazlar modellenmiş, sıcaklık ve emisyon dağılımları Ansys Fluent ticari
kodu ile tahmin edilmiştir. Elde edilen tahmin sonuçları, % 45 CH₄ -
% 55 CO₂ karışımlı biyogazın sıcaklık seviyelerinin yanma odası
giriş bölgelerinde daha düşük, yanma odası çıkışına doğru daha yüksek olduğunu
göstermiştir. CO₂ ve H₂O tahminlerinde ise, bünyesinde
daha fazla miktarda CO₂ bulunduran biyogaz için CO₂
seviyeleri ve H₂O seviyeleri daha yüksek olarak belirlenmiştir.

Anahtar Kelimeler

Biyogaz, Yanma, Emisyon

Kaynakça

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