A computational fluid dynamics ınvestigation of the utilization of waste biomass fuels for syngas production in a downdraft reactor

Yıl 2024, Cilt: 14 Sayı: 4, 1074 - 1087, 15.12.2024

Merdin Danışmaz

https://doi.org/10.17714/gumusfenbil.1397368

Öz

Biomass gasification, one of the gasification technologies, is among the technologies being developed for environmentally friendly and clean energy production of waste non-forest wood products and is a common subject of study in this field. In this study, gasification of three different biomasses (pine wood, pinecone, and hazelnut shell) in a downdraft reactor was analyzed and simulated. Ansys-Fluent commercial software (version 2020) was used for the analysis and calculations. A small-scale gasification reactor was modeled, and fuel and air feed conditions were determined. The air-fuel ratio required for gasification was analyzed with different equivalence ratios (0,15-0,35) to demonstrate the difference from stoichiometric combustion. According to the reactor gas temperature distribution and the content of the synthesis gas produced, it was determined that the equivalence ratio of 0,20 is suitable for a gasifier of this scale. By reaching temperatures above 900 °C in the reactor, the contours of CO, H2O and CH4 combustibles in the synthesis gas content in the reactor were shown and its proportions in the mixture were determined. The results were found to be consistent with the values in scientific literature. It was revealed that waste biomass can be used in clean energy production, and it is possible to develop fuel and capacity specific gasification reactors with CFD analysis.

Anahtar Kelimeler

Downdraft, Biomass, Gasification, CFD, Syngas

Atık biyokütle yakıtlarının aşağı akışlı reaktörde sentez gazı üretiminde kullanımının hesaplamalı akışkanlar dinamiğiyle incelenmesi

Öz

Gazlaştırma teknolojilerinden biri olan biyokütle gazlaştırması, atık orman dışı odun ürünlerinin çevreci ve temiz enerji üretiminde kullanımı amacıyla geliştirilmekte olan teknolojilerden biridir ve bu alanda yaygın çalışma konuları arasındadır. Bu çalışmada, üç farklı biyokütlenin (Çam odunu, çam kozalağı, fındık kabuğu) aşağı akışlı bir reaktördeki gazlaştırma analiz ve simülasyonu yapıldı. Analiz ve hesaplamalarda Ansys-Fluent ticari yazılımının 2020 versiyonu kullanıldı. Küçük ölçekli bir gazlaştırma reaktörü modellenerek yakıt ve hava besleme koşulları belirlendi. Gazlaştırma için gerekli hava-yakıt oranının, stokiyometrik yanmadan farklılığını ortaya koymak için farklı eşdeğerlik oranlarıyla (0,15-0,35) analizler yapıldı. Reaktördeki gazın sıcaklık dağılımı ve üretilen sentez gazının içeriğine göre 0,20 eşdeğerlik oranı değerinin bu ölçekte bir gazlaştırıcı için uygun olduğu belirlendi. Reaktör içerisinde 900 °C’nin üzerinde sıcaklık değerlerine ulaşılarak sentez gazı içeriğindeki CO, H2O ve CH4 yanıcılarının reaktör içerisindeki kontürleri gösterildi ve karışımdaki oranları belirlendi. Bulguların bilimsel literatürdeki değerlerle uyumlu sonuçlar içerdiği görüldü. Atık biyokütlelerin temiz enerji üretiminde kullanılabileceği ve ayrıca, HAD analiziyle yakıt ve kapasite özelinde gazlaştırma reaktörlerinin geliştirilmesinin mümkün olduğu ortaya kondu.

Anahtar Kelimeler

Aşağı akışlı, Biyokütle, Gazifikasyon, HAD, Sentez gazı

Etik Beyan

Bu makalenin yazarı, bu çalışmada kullanılan materyal ve yöntemlerin etik kurul izni ve / veya yasal-özel izin gerektirmediğini beyan etmektedir

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