MATHEMATICAL MODELS OF THE TOTAL LIFE CYCLE OF A POWER UNIT OPERATING ON ALTERNATIVE MOTOR FUELS DERIVED FROM NATURAL GAS

Using the total life cycle (TLC) methodology, it is possible to obtain the most accurate technical, ecological and economic evaluation of the efficiency of alternative fuels, which should be carried out taking into account all the stages of the life cycle: the extraction of raw materials; their transportation; the production of fuels; auxiliary processes for obtaining fuels and electricity, as well as the use of motor fuels in power units. Based on the consumption of alternative fuels in transport, and taking into account the advantages of natural gas (NG) among the other alternative fuels, it can be argued that its application is most promising. This is due to large explored reserves of NG, as well as the possibility of significantly reduced emissions of harmful substances when it is burned in an internal combustion engine in comparison with the use of fuels of a different origin. It is possible to directly use NG, as well as to obtain other applied alternative fuels from it. Taking into account the existing methods for estimating the parameters of power units and fuels in the TLC, as well as the requirements of international standards for assessing the environmental safety of products in the TLC (GOST R ISO 14040-14043), the problem of creating mathematical models was being solved to describe material and energy flows for various alternative motor fuels. The mathematical models of the TLC of a power unit working on motor fuels obtained from natural gas have been developed: compressed NG, liquefied NG, methanol, dimethyl ether (DME), synthetic diesel fuel and hydrogen. In particular, this paper presents the mathematical model of the TLC of a propulsion system operating on DME in more detail. The mathematical model allows to calculate the energy and material flows in the TLC of the power unit, determine the expenditure of natural resources, energy, emissions of harmful substances into the environment, compare various fuel options and choose the most efficient ones taking into account the TLC.

total life cycle, power unit, alternative fuels, mathematical model, material and energy flow

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