Sustainable aviation fuel (SAF) is a type of fuel that is made from renewable resources, such as waste biomass or algae, and is designed to reduce greenhouse gas emissions from air travel. SAF pathways such as HEFAFT and ATJ are the different methods used to produce SAF.
The production of SAF involves the conversion of renewable resources into a fuel that can be used in aircraft engines. This process typically involves the extraction of oils from the renewable resources, followed by the conversion of these oils into a fuel that can be used in aircraft engines. Certification of SAF is typically done through the ASTM D7566 standard, which ensures that the fuel meets the necessary safety and performance standards.
SAF Pathways
There are several different SAF pathways that can be used to produce SAF. These include HEFA (Hydrotreated Ester and Fatty Acid), FT (Fischer-Tropsch), and ATJ (Alcohol to Jet). Each of these pathways has its own advantages and disadvantages, and the choice of which pathway to use will depend on the specific application and the desired properties of the fuel.
Certification and Lifecycle Emissions
In order to be used in commercial aviation, SAF must be certified to meet the necessary safety and performance standards. This certification is typically done through the ASTM D7566 standard, which ensures that the fuel meets the necessary standards for use in aircraft engines. Lifecycle emissions are also an important consideration when evaluating the environmental benefits of SAF. Lifecycle emissions math is used to calculate the total emissions associated with the production and use of SAF, from the extraction of the renewable resources to the combustion of the fuel in the aircraft engine.
Infrastructure and Engine Compatibility
In order to support the use of SAF, infrastructure such as fuel storage and distribution systems must be in place. Additionally, engine compatibility is an important consideration, as not all aircraft engines are compatible with SAF. Cost curves are also an important consideration, as the cost of producing SAF can be higher than traditional fossil fuels.
Evaluating Suppliers and Offtake Contracts
When evaluating suppliers of SAF, it is important to consider factors such as the sustainability of the renewable resources used, the efficiency of the production process, and the cost of the fuel. Offtake contracts are also an important consideration, as they can provide a guarantee of the purchase of the SAF and help to ensure the economic viability of the production process.
