Efficiency of hydrogen use in mixtures with compressed natural gas on car engines
DOI:
https://doi.org/10.31471/1993-9868-2021-2(36)-98-105Keywords:
engine, alternative fuels, hydrogen, compressed natural gas, economic efficiency, fuel mixtures, heat of combustion, cost.Abstract
One of the important aspects of using hydrogen in an equivalent fuel is economic efficiency. In the calculations of the economic efficiency of the use of hydrogen as an additive to compressed natural gas, the necessary technical condition is to ensure the same calorific value of the equivalent fuel in comparison with commercial natural gas. To solve this problem, we obtained the dependence of the change in the price of natural gas on the lower heat of combustion, calculated the change in the consumption of equivalent fuel from the equation of heat balance contained in compressed natural gas and equivalent fuel. Depending on the increase in the lower heat of combustion when adding hydrogen, we obtained the value of the heat of combustion of compressed gas that can be used in mixtures with hydrogen. Therefore, for the accepted prices for compressed natural gas and hydrogen and under the same calorific value of equivalent fuel and compressed natural gas from the calculations it is seen that with increasing percentage of hydrogen in fuel mixtures of natural gas and hydrogen increases economic efficiency. This is due to the use in fuel mixtures of natural gas with low calorific value, and hence low cost, and as an option it can be biogas. When using hydrogen additives to compressed natural gas with low calorific value in the amount of up to 70% by weight, you can achieve a reduction in the cost of natural gas to 12.5 UAH on kilogram. This effect, when using hydrogen additives to natural gas, indicates the prospects of this direction of hydrogen use and the feasibility of further research.
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