Research On System Integration Of MCFC Hybrid Power System With CO₂ Capture And Off-design Characteristics

Molten carbonate fuel cell(MCFC)is a new type of power generation energy conversion device.Compared with the traditional thermal power generation device,MCFC is not limited by Carnot cycle,and the theoretical energy conversion efficiency is as high as 60%-80%.Because of its high exhaust temperature,high taste of waste heat has a high value,so you can use the waste heat boiler to recover its high-temperature exhaust heat for power generation,both to improve energy efficiency and reduce pollutant emissions.In recent years,with the favor of efficient and environment-friendly energy utilization,the MCFC/GT and the MCFC/ST composite power generation system have attracted the attention of researchers from all over the world.Therefore,the research on the changing conditions of the MCFC composite system is very unusual Significance.In order to make MCFC operate efficiently and steadily and ensure the system can not be damaged under the load change,the fuel cell system must be effectively controlled so that the system can work in the best working condition.Changes in load or changes in fuel input can cause changes in battery performance and system operating conditions.Based on the steady-state MCFC model,the MCFC/ST composite system is optimized.The relationship between current density and fuel utilization,CO2 utilization rate and voltage is discussed.A study was made on the composite power generation system consisting of MCFC/GT and MCFC/ST respectively,and the reasonable control strategy of variable conditions was explored.The influence of each control strategy on the operating characteristics of the complex system was also analyzed.The unique internal reaction mechanism of molten carbonate fuel cell(MCFC)can effectively achieve CO2 capture.This paper explores the performance of multi-stage high fuel recovery(MCFC)recovery of CO2,and designs a MCFC/ST composite power system that can recover CO2 Compared with oxygen-rich combustion decarburization,the system performance shows great superiority under the same carbon capture rate.At the end of this paper,the experimental conditions of MCFC monolithic experimental bench are introduced.A series of experiments are carried out on the single fuel cell.The first is to explore the effect of different fuel concentrations on the performance of the cell.The second is to study the variation ofsystem main parameters under different operating conditions.The research results in this paper have laid a theoretical foundation for the research of MCFC composite power system.