Numerical study of exhaust reforming characteristics on hydrogen production for a marine engine fueled with LNG
| Autor: | Zunhua Zhang, Junjie Liang, Geyu Zhong, Gesheng Li, Pengpeng Jia |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Waste management Carbon dioxide reforming Methane reformer Hydrogen business.industry 020209 energy education 05 social sciences Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Combustion Industrial and Manufacturing Engineering Methane Steam reforming chemistry.chemical_compound Chemical engineering chemistry 0502 economics and business 0202 electrical engineering electronic engineering information engineering Exhaust gas recirculation 050207 economics business Hydrogen production |
| Zdroj: | Applied Thermal Engineering. 124:241-249 |
| ISSN: | 1359-4311 |
| DOI: | 10.1016/j.applthermaleng.2017.06.012 |
| Popis: | When the engine exhaust heat is used for catalytically reforming the mixtures of natural gas and partial exhaust to produce the on-board hydrogen, the hydrogen-rich combustion can be achieved to improve the combustion performance of the natural gas engine. In this work, according to the Exhaust Gas Recirculation (EGR) system of a LNG-fueled engine, an exhaust reforming reaction tube of the reformer with interior coated Ni-based catalyst was modeled with full computational fluid dynamics (CFD) combined with detailed chemical reaction mechanisms to study the reforming characteristics when the EGR ratio ranges from 2.5% to 10% and the molar ratio of water to carbon ranges from 1.0 to 3.5. The simulation results present species formation characteristics in the reforming reactions which involve only steam reforming reaction and partial reforming reaction. Higher mass ratio of water to fuel (W/F) is advantageous for the methane reforming reaction, more hydrogen yield and the inhibition of the coke formation, while higher EGR ratio promotes the conversion of methane and carbon monoxide production. The simulation result also gets a high molar ratio of hydrogen to carbon monoxide ratio for the presence of excess water content. In the given conditions, a more preferable reaction process can be achieved when EGR rate is equal to 5% and W/F gets the value of 3.5. |
| Databáze: | OpenAIRE |
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