International Journal of Hydrogen Energy, Vol.43, No.37, 17821-17834, 2018
Hydrogen and power generation from supercritical water reforming of glycerol and pressurized SOFC integrated system: Use of different CO2 adsorption process
The performance analysis of an integrated system of glycerol supercritical water reforming and pressurized SOFC was presented. The use of different CO2 adsorption processes that include in situ and ex situ processes was compared to determine the suitable process for hydrogen and power generations. The influence of operating condition, e.g., temperature and pressure of reformer, supercritical water to glycerol (S/G) molar ratio, and calcium oxide to glycerol (CaO/G) molar ratio was examined. Then, the electrical performance of each integrated process was considered with respect to the SOFC conditions comprising temperature, pressure, and current density. The simulation results revealed that both processes have same favourable conditions for temperature and pressure operated at 800 degrees C and 240 atm, respectively. The suitable S/G and CaO/G molar ratios for in situ process are 10 and 2 whereas those for ex situ process are 20 and 1. Under these conditions, maximum hydrogen can be achieved as 87% and 75% for in situ and ex situ processes, respectively. When both integrated processes are operated at the optimal SOFC conditions as 900 degrees C, 4 atm, and current density of 10,000 A/m(2), the SOFC efficiency of 71.56% and 62.12% can provide for in situ and ex situ processes, respectively. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Keywords:Glycerol;Supercritical water;Reforming;CO2 removal process;Pressurized;Solid oxide fuel cell