GEMİ DİZEL MOTORU İLE HİDROJEN ÜRETİMİNE YÖNELİK YENİLİKÇİ EGZOZ HATTI TASARIMI VE PERFORMANS ANALİZİ

Year 2025, Volume: 17 Issue: 2, 274 - 297, 25.12.2025

Semih Yılmaz

https://doi.org/10.18613/deudfd.1763493

Abstract

Günümüzde deniz yoluyla gerçekleştirilen taşımacılık, küresel ticaret ile taşınan yüklerin büyük bölümünü kapsamaktadır. Bu yüklerin taşınması esnasında yüksek güçte ve dizel yakıtla çalışan gemiler kirletici gaz salımına neden olmaktadır. Uluslararası Denizcilik Örgütü (IMO) tarafından belirlenen katı salım sınırlamaları ve 2050 yılına kadar sektör kaynaklı kirletici gaz salımlarının %50 oranında azaltılması hedefi, denizcilik sektörünü alternatif yakıtlar ve temiz enerji çözümleri arayışına yöneltmiştir. Bu çalışma, gemi dizel makinelerinden çıkan atık ısı kullanılarak Buharlı Metan Dönüşümü (SMR/BMD) yöntemiyle gemi üzerinde hidrojen üretimini sağlayacak yenilikçi bir egzoz hattı tasarımını ve performans analizini sunmaktadır. Tasarlanan sistem, gemi makinesinin %100, %80 ve %50 yük koşullarında egzoz gazı sıcaklığı, basıncı ve akış hızını BMD prosesi için uygun seviyelere getirmeyi hedeflemektedir. Egzoz hattında burgulu ve delikli yönlendirici kullanılarak akış homojenliği ve ısı transferi iyileştirilmiştir. Sayısal analizler, hesaplamalı akışkanlar dinamiği yöntemiyle gerçekleştirilmiş; farklı geometriler ve yönlendirici sıcaklıklarının performansa etkileri değerlendirilmiştir. Sonuçlar, yönlendirici sıcaklığının artırılmasının çıkış gazı sıcaklığını 30 K’a kadar yükselttiğini, kesit ölçüsü artışının ise hızda yaklaşık 5 m/s artış sağladığını göstermektedir. Bu bulgular, verimli atık ısı kullanımı sayesinde gemide hidrojen üretilebileceğini ve kirletici gaz salımlarının azaltılabileceğini ortaya koymaktadır.

Keywords

Atık Isı Geri Kazanımı , Yenilikçi Egzoz Tasarımı , Hidrojen Üretimi , HAD , Karbonsuzlaştırma

INNOVATIVE EXHAUST LINE DESIGN AND PERFORMANCE ANALYSIS FOR HYDROGEN PRODUCTION WITH A MARINE DIESEL ENGINE

Abstract

Today, maritime transport accounts for a large proportion of global trade and cargo transportation. The transportation of these goods results in the emission of polluting gases from high-powered, diesel-fueled ships. The strict emission limits set by the International Maritime Organization (IMO) and the goal of reducing pollutant gas emissions from the sector by 50% by 2050 have prompted the maritime industry to seek alternative fuels and clean energy solutions. This study presents an innovative exhaust system design and performance analysis that enables hydrogen production on board ships using the Steam Methane Reforming (SMR) method, utilizing waste heat from ship diesel engines. The designed system aims to bring the exhaust gas temperature, pressure, and velocity to suitable levels for the SMR process under 100%, 80%, and 50% load conditions. Flow homogeneity and heat transfer have been improved by using helical and perforated deflectors in the exhaust system. Numerical analyses were performed using computational fluid dynamics methods; the effects of different geometries and deflector temperatures on performance were evaluated. The results show that increasing the deflector temperature raises the exhaust gas temperature by up to 30 K, while increasing the cross-sectional area increases the velocity by approximately 5 m/s. These findings demonstrate that waste heat can be efficiently utilized to produce hydrogen onboard a ship and reduce gas emissions.

Keywords

Waste Heat Recovery , Innovative Exhaust Design , Hydrogen Production , CFD , Decarbonization

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