Volume 27: Closing Carbon Cycles – A Transformation Process Involving Technology, Economy, and Society: Part II

Hydrogen Production Characteristic of Diesel Reforming under Ship SOFC-GT Operation Environment Xicong Mi , Xusheng Wang , Catalina Spataru , Xiaojing Lv, Yiwu Weng

Abstract

SOFC/GT (Solid Oxide Fuel Cell-Gas Turbine) hybrid system is proposed as one of the advanced power systems of future ships due to its high efficiency, low emission and fuel flexibility. However, how to efficiently reform marine diesel into H2 is the key to maintaining the operation of SOFC/GT. The paper studies the influence of operating parameters such as steam to carbon ratio (S/C), temperature and pressure of ship SOFC/GT hybrid system on H2 production characteristics of marine diesel reforming through numerical simulation and experimental analysis. The results show that under the rated operating condition, the H2 mole fraction in reformate accounts for 50%, and the absolute error of the H2 mole fraction between the simulation result and the experimental result is 2.67%. Under the variable working conditions, in the range of 923~1123K, the H2 production increases with the increase of temperature and the carbon deposition decreases. When the temperature increases to 1123K, the mole fraction of H2 reaches a maximum of 56%, and the H2 yield reaches a maximum of 2.65. The increase of S/C promotes the increase of H2 yield and inhibits carbon deposition. Pressure has a negative effect on H2 production. The research results can provide basic technical support for the safe and efficient operation of the SOFC-GT hybrid power system on ships and the continuous supply of fuel.

Keywords Marine diesel,Ship SOFC-GT,Reforming characteristic,H2 yield,Carbon deposition