Аdvantages and disadvantages of various types of fuels are considered in the article; the method of cleaning alternative fuel for agricultural machines is developed, namely, the increase of methane content in the fuel mixture of diesel - gas as an alternative fuel for machine - tractor aggregates. The proposed method results in relatively small losses of methane to 0.06%. When the system operates at standard pressure, power consumption is less than 0.04 kWh / m3, which gives the system the

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... ty to work economically. The fuel gas produced as a by-product can be good for heating a bioreactor. Purified biogas (methane content 97.7% by volume). The content of methane can be further increased by further cooling. The invention allows increased methane output and lower energy consumption. The work contains 6 formulas, 1 drawing and 12 literary sources.