Case Study of Hydrogen Production on Board LNG Carrier

EasyChair Preprint no. 8569

Abstract

The present work assesses the performance of hydrogen production plant aboard liquefied natural gas (LNG) carrier via a thermodynamic model written in engineering equation solver software (EES). The raw material for hydrogen production considered is the excess boil-off gas (BOG) generated in liquefied natural gas (LNG) tanks; the produced hydrogen could be used by the propulsion plant and auxiliaries.

The present approach aims to determine the conditions for optimum performance in term of plant thermal efficiency as well as carbon dioxide (CO₂) emissions in order to comply with the long term international maritime organization (IMO) regulations. To this end, the system key parameters, namely reforming temperature, air & BOG temperature at the inlet of combustion chamber and steam to carbon (S/C) ratio are varied and analyzed. As a result, it was found that increasing the reformer temperature increases both the performance of the process and carbon dioxide (CO₂) emissions. On the other hand the steam to carbon (S/C) ratio decreases the hydrogen productivity therefore decreases the thermal efficiency. Preheating the air & BG before entering the combustion chamber raises the efficiency and reduces the CO₂ emissions.

Keyphrases: Boil-off gas, efficiency, Energy, Hydrogen production, Steam methane reforming

@Booklet{EasyChair:8569,
  author = {Ikram Belmehdi and Boumedienne Beladjine and Mohamed Djermouni},
  title = {Case Study of Hydrogen Production on Board LNG Carrier},
  howpublished = {EasyChair Preprint no. 8569},

  year = {EasyChair, 2022}}