Research On MCFC Hybrid Power System With CO₂Capture

In the21st century, with the continuous advance in technology, to achieve economic and social sustainable development has become a realistic issue which mankind has to face. Recently significant emission of greenhouse gas such as CO2caused by excessive use of coal resources has led to the rise of sea level, which has disturbed people’s normal life. Therefore, in the case of energy shortage, it is necessary to adjust the energy structure reasonably and further improve the energy efficiency. Based on traditional hybrid system without CO2recycling, this paper introduces a gas-steam combined cycle system with CO2capture by integrating molten carbonate fuel cell (MCFC), solving the CO2emission problem of gas turbine under the premise to ensure system efficiency.The first part of this paper mainly introduces the research status of the MCFC, establishes the MCFC ontology model after referencing that of solid oxide fuel cell (SOFC) using Aspen Plus software and finally derives its performance parameters such as voltage and efficiency within a reasonable range. This paper also introduces oxygen production module of low energy consumption and high efficiency from the perspective of system modules:oxygen ion transfer membrane (OTM).The second part introduces a new hybrid system with recycling of CO2in gas turbine exhaust by integrating MCFC and OTM on the basis of gas-steam combined cycle system. It reveals that the new system has obvious advantages in energy saving through contrast with the basic system and optimization analysis of its key performance parameters.The third part proposes a new hybrid system on the basis of the second part, which uses two-stage MCFC to recycle CO2in the gas turbine exhaust. In addition, during the liquefied CO2compression process it uses a new liquefaction method combined with waste heat-driven cooling, exploring the obvious superiority of CO2capture of this new system using the Specific Primary Energy Consumption for CO2Avoided (SPECCA) as the main performance parameter. Achievements from this paper lay a theoretical foundation for the design of new hybrid system integrating efficient and low CO2emission MCFC and provide new ideas and approaches for the implementation of energy saving strategies for our conventional power generation systems.