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This work is aimed at solving the problem of converting diesel power drives to diesel–
hydrogen fuels, which are more environmentally friendly and less expensive alternatives to diesel fuel.
The method of increasing the energy efficiency of diesel fuels has been improved. The thermochemical
essence of using methanol as an alternative fuel to increase energy efficiency based on the provisions
of thermotechnics is considered. Alternative methanol fuel has been chosen as the initial product
for the hydrogen conversion process, and its energy value, cost, and temperature conditions have
been taken into account. Calculations showed that the caloric effect from the combustion of the
converted mixture of hydrogen H2 and carbon monoxide CO exceeds the effect from the combustion
of the same amount of methanol fuel. Engine power and fuel energy were increased due to the
thermochemical regeneration of engine exhaust gas heat. An experimental setup was created to study
the operation of a converted diesel engine on diesel–hydrogen products. Experimental studies of
power and environmental parameters of a diesel engine converted for diesel–hydrogen products
were performed. The studies showed that the conversion of diesel engines to operate using diesel–
hydrogen products is technically feasible. A reduction in energy consumption was accompanied by
an improvement in the environmental performance of the diesel–hydrogen engine working together
with a chemical methanol conversion thermoreactor. The formation of carbon monoxide occurred
in the range of 52–62%; nitrogen oxides in the exhaust gases decreased by 53–60% according to the
crankshaft speed and loading on the experimental engine. In addition, soot emissions were reduced
by 17% for the engine fueled with the diesel–hydrogen fuel. The conversion of diesel engines for
diesel–hydrogen products is very profitable because the price of methanol is, on average, 10–20% of
the cost of petroleum fuel.