Improvement of a SOFC/MGT (Solid Oxide Fuel Cell/Micro Gas Turbine) Top-level Cycle Hybrid Power Generation System

The measures for improving the hybrid power generation system of a typical top-level cycle SOFC/MGT (solid oxide fuel cell/micro gas turbine) were proposed and ceramic mesotron membrane was used to separate the reaction product at the positive pole of the cell pile in the first stage. The hydrogen thus separated was introduced onto the positive pole of the cell pile in the second stage to continue the electrochemical reaction after having been cooled,pressurized and preheated. The reaction product from the cell pile in the second stage and the gas remaining after the hydrogen separation were fed into the rear combustor to conduct a combustion reaction. In combination with a specific calculation case,a simulation analysis was performed of the above two-stage tandem power generation system. The research results show that because of an increase of the hydrogen quantity for electrochemical reactions,the hydrogen quantity for the combustion reaction will decrease,making it possible to remarkably lower the exergy loss of the whole system and thereby raising the power generation efficiency of the improved system by 2.92 percentage points,which is higher than the reference system at an identical utilization rate of the fuel cell piles and at a same turbine inlet temperature. The foregoing measure is regarded as an effective method for improving the SOFC/MGT hybrid power generation system.