Life Cycle Assessment And Economic Analysis Of Jet Fuel Produced By Biomass Gasification Fischer-Tropsch Synthesis

As the huge demand for the world air transport,the requirement of aviation fuel in many countries is growing day by day,especially for China,which has a large population.Conventional jet fuel not only heavily relies on fossil energy,but also has large amounts of greenhouse gas emissions,which restrict the sustainable development of the aviation industry.So,Bio-jet fuel has attracted widespread attention for its renewable energy sources and effective life-cycle greenhouse gas reduction ability.Among all the pathways for bio-jet fuel production,Fischer-Tropsch synthesis technology is the most commercialized at present,and has good emission reduction capabilities,high economical,wide feedstock distribution,however,However,pilot or demonstration for the Fischer-Tropsch synthesis technology to produce jet fuel are mostly concentrated in foreign countries,and development in China is relatively slow,the technology and policy are incomplete for the commercial development.The paper proposes a simulation study and a commercial scale life-cycle assessment,economic analysis of biomass gasification Fischer-Tropsch synthesis production jet fuel system to provide some technical and policy references for the development of the technology in China in the future.Firstly,the simulations of the system were down by Aspen Plus based on the jet fuel selectivity and yield and system energy utilization rate.The results show that the best gasification conditions were 750°C,0.1 MPa,the optimal Fischer-Tropsch synthesis conditions were 230°C,2.5 MPa.Under optimal reaction conditions,the jet fuel selectivity for the system is 42.36%,the jet fuel yield is 98.72 kg/t,and the system energy utilization rate is 52.02%.Then,life-cycle assessment of system was down,and the non-renewable resource consumption and greenhouse gas emissions of the system were calculated.The results show that the non-renewable resource consumption of the system is 1.71×10⁴ MJ/t,The electricity consumption during the production stage and the fertilizers consumption during the corn stalks growth are the major contributors to resource consumption;The greenhouse gas emissions of the system is 54.44 g CO₂/MJ,greenhouse gas emissions reduced by 39.5%compared to conventional jet fuel,GHG emissions during the growth stage of the corn stalk,and the greenhouse gas caused by the fertilizer,emissions from electricity use,and CH₄emissions from wastewater are major contributors.Finally,an economic analysis of the system was carried out based on the minimum selling price of jet fuel.The results show that the main contributor to the total investment for the systems is the production cost,which makes up 74.32%of the total investment;Considering the by-products,the minimum selling price of the bio-jet fuel is?9495 per ton,which is 28.32%lower than the minimum selling price of the bio-jet fuel that regardless of the by-products;Reduce the cost of biomass feedstock is the most effective way to improve the economic efficiency of the bio-jet fuel,when the government subsidizes?100 for per feedstock,the production cost will reduce by 10.52%,the minimum sales price of the bio-jet fuel will reduce by about 11.20%,when the production efficiency increase by 10%,the production cost of bio-jet fuel will reduce by 4.3%,and the minimum selling price will reduce by approximately 4.7%.In summary,the biomass gasification Fischer-Tropsch synthesis production jet fuel system has ability to reduce greenhouse gas emissions,but its economic is relatively low.The main measures to further reduce the greenhouse gas emissions of the system are to reduce the external electricity consumption in the production process and the use of fertilizers in the process of feedstock growth;the main measures to improve economic of the system is to reduce the cost of feedstock,including feedstock subsidies and the increase of the feedstock production efficiency.