In order to production a synthesis gas of a given composition from the solid fuel, an experi-mental two-stage entrained-flow gasifier is installed. In this paper, a method for calculating the oper-ating mode of a two-stage gas generator, developed on the basis of the heat balance and the assump-tion of achieving thermodynamic equilibrium at the outlet of the aggregate is described. The ad-vantage of the technique is simplicity. By given composition of the fuel at the gas generator input, the excess air factor and the synthesis gas temperature at the outlet, the composition of the synthesis gas as well as the fuel feed in the first and second stages, air flow and water vapor are determined. Based on literature sources analysis, it is accepted that a high fuel conversion degree is achieved at a synthesis gas temperature at the outlet was 1100–1300 °C and the particles residence time in the gasifi-cation zone was 1.5–2 s. On this basis, the temperature and gas velocity in the second stage were given in the calculation, by velocity then determines the synthesis gas volumetric flow and the fuel consumption are calculate. Examples of the process parameters calculating for the gasification of charcoal at temperatures of 1100 and 1300 °C are given.
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