Thermodynamic Calculation of the Natural Gas Pressure Reduction in a Turboexpander
O. M. Sokovnin, N. V. Zagoskina, S. N. Zagoskin
OLNI Company, Kirov, 610050, Russia
Keywords: natural gas, multistage turboexpander, pressure reduction, mathematical model
Abstract
A mathematical model of stepwise natural gas pressure reduction in a multistage turboexpander has been developed using a thermodynamic approach taking into account the real gas properties. It has been shown that the maximum use of natural gas overpressure energy is provided when the outlet-to-inlet pressure ratio is above the critical value at each stage. The change in the temperature of the natural gas and its technical work at each stage of the turboexpander have been numerically determined. It has been found that the rate of temperature drop and the increment in the technical work of natural gas increase from stages to stage of the turboexpander. Comparison of the calculated and experimental values of the performance parameters of the gas turboexpanders showsthat they are in good agreement.
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