Determination of hydrogen production performance with waste exhaust gas in marine diesel engines.

Steam-methane reformers are one of the most effective environmental systems used to obtain hydrogen with the effect of temperature. This study investigated hydrogen production efficiency numerically with exhaust waste heat. Two different scenarios were studied parametrically at five various engine loads. In this study, steam methane reactor temperature change, hydrogen, CO and CO 2 formation amounts were determined according to each exhaust temperature and mass flow rate. As a result of the study, the temperature changes for the scenario 1 and scenario 2 conditions of the steam methane reformer were examined and it was found that the maximum temperature change was 26.7% at the 25% engine load condition. The maximum hydrogen production mass flow rate in proportion to the temperature was approximately 7020 g/h in scenario 2 at 25% engine load condition. Radical CO formation showed that system performance is not realized efficiently enough. The study's significant finding is that increasing the temperature and using catalysts throughout the system increases hydrogen production. • A 2D CFD reforming model is developed to predict H 2 production. • Investigation of H 2 production potential with waste heat of marine diesel engine. • CFD shows that H 2 production increases with rising temperature. • The effect of modified exhaust temperatures on H 2 production was simulated. • The use of catalysts obviously promotes H 2 production. [ABSTRACT FROM AUTHOR]