Process Evaluation Of Biomass Gasification And Synthetic Liquid Fuel Driven By Concentrated Solar Energy

Traditional liquid fuels are produced from petroleum resources,which are limited and polluting.In contrast,the significant advantage of using biomass to produce liquid fuel is that the biomass feedstock is renewable and the whole process is carbon neutral,which will not cause a large amount of greenhouse gas emissions.The introduction of solar energy into the process of producing liquid fuel from biomass can not only realize the complementary utilization of energy,but also increase the biomass conversion rate by reducing the biomass combustion process.In this case,the comprehensive evaluation of the production process of biomass liquid fuel driven by solar energy is of great significance for its popularization and utilization.This paper constructs a fuel-synthesis system driven by concentrated solar energy for biomass gasification for the purpose of synthesizing clean fuels using solar energy and biomass,and uses the Aspen Plus platform to establish related models to analyze the system in many aspects.Firstly,through the thermodynamic analysis of the system,the thermodynamic performance parameters such as system efficiency and loss are defined,and the research direction of system optimization is pointed out.Secondly,based on the thermodynamic analysis of the system,the technical economy model of the system is established.Its main economic performance indicators were obtained by calculating its annual net cash flow,and important parameters affecting its economic performance indicators were identified.Finally,the carbon footprint and water footprint of the system are calculated by accounting the greenhouse gas emissions and water consumption list of the system,revealing the intensity of the system’s impact on the environment.The results show that the thermal efficiency of the fuel synthesis system based on biomass gasification driven by concentrated solar energy is 40.66%,which is almost the same as that of the reference system based on traditional gasification technology(40.22%);as concentrated solar energy is used as a heat source,exergy efficiency of the former is41.35%,which is slightly better than that of the latter(38.35%).When the same mass of biomass was treated,the quality of gasoline and diesel produced by the solar system was65.74%higher than that of the reference system.And the cost of gasoline for the solar system is 1.507×10~4 CNY/t and that of diesel is 1.242×10~4 CNY/t,24.32%%higher than that of the reference system and no advantage in terms of technical economy.In terms of environmental impact,the carbon footprint and water footprint of the solar system are0.1561 t/GJ and 39.514 m~3/GJ,55.27%and 61.34%of the reference system,respectively.By contrast,the solar system is more environmentally friendly technology.The results of system evaluation show that the primary problem of developing solar-biomass liquid fuel system is to reduce the production cost of the system.