Abstract
The accurate modeling of the fast-fill process occurring in Compressed Natural Gas (CNG) fuelled vehicle storage cylinders is a complex process and should be thoroughly studied. Final in-cylinder conditions should meet appropriate cylinder safety standards. The composition of natural gas plays an important role on its thermodynamic properties and consequently, on the fast-fill process and the final conditions. Here, a theoretical analysis has been developed to study the effects of the natural gas composition on the filling process of an onboard Natural Gas Vehicle (NGV) cylinder. The cylinder is assumed as a lumped system. The analysis is based on laws of thermodynamics and mass balance. Based on AGA8 Equation of State (EOS) and thermodynamics relationships, the required properties of natural gas mixtures have been calculated. The results are presented for an adiabatic system. The results show that the compositions of natural gas have great effects on the filling process and final in-cylinder conditions. Furthermore, the gas with less methane percentage in its composition is more suitable for the filling process.
Highlights
Compressed Natural Gas (CNG) is considered as a clean alternative to other car fuels such as gasoline and diesel [1]
It is found that the time required for bringing up the Natural Gas Vehicles (NGV) onboard cylinder to its final pressure in the buffer storage system is about 66% less than the cascade storage system
The main purpose of the current study is to investigate the effects of natural gas compositions on filling process and final in-cylinder conditions for a buffer storage system
Summary
Compressed Natural Gas (CNG) is considered as a clean alternative to other car fuels such as gasoline (petrol) and diesel [1]. There are millions of Natural Gas Vehicles (NGV) on the streets and that number is growing continuously. The NGVs usually receive natural gas from high pressure reservoirs at the fuelling stations during filling. The onboard vehicle storage cylinders encountered a rise in in-cylinder temperature during the filling. This temperature rise decreases the density of the gas, resulting in an under-filled cylinder, relative to its rated specification. If this temperature rise is not compensated for in the fuelling station, by transiently over-pressurizing the cylinder, the vehicle driver will experience a reduced driving range
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