Turboexpanders for gas industry are used for various purposes, for example, for generating electricity at gas distribution and compressor stations of the natural gas transmission system. Considering the initially high gas pressures, in many cases it is advisable to use a system of successively located turbine drives. This makes it possible to convert the energy of gas pressure into electrical energy to consumers of different capacities.

To date, theoretical work on the optimization of regime and geometric parameters of such systems at initial stages of design is absent. In this paper, parametric studies were conducted on the effect of initial project data on the energy efficiency of a system of two turbo-generators with a power of up to 50 kW. As initial data, the thermodynamic parameters at the input and output from the turbine drive system and the operating parameters of the turbine drives are considered. To carry out the research, a mathematical flow model in the system of series connected axial small-sized turbines is implemented in the Matlab software package.

Rational ranges of thermodynamic and regime relationships are found, which allows to significantly increase the design efficiency of a system of axial small-sized turbogenerators in comparison with the case of its design without taking into account the received information.

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