Coal partial gasification studies applied to co-production of hydrogen and electricity

To search for the optimum working condition of coal partial gasification for co-production of hydrogen and electricity, a gasifier has been simulated and studied by the use of an Aspen Plus model. Oxygen-to-coal ratio, steam-to-coal ratio and steam temperature are optimization variables of the system. The optimization variables impact on syngas yield, syngas concentration, system exergy efficiency, HER and CO₂ separation rate have been analyzed. It is found that the oxygen-to-coal ratio and the steam-to-coal ratio both have large influence on performances of gasifer and system and the steam temperature has the least influence.