USING A THERMODYNAMIC APPROACH TO ESTIMATE A TEMPERATURE DROP OF NATURAL GAS IN A PRESSURE REGULATOR
O. M. Sokovnin, N. V. Zagoskina, S. N. Zagoskin
LLC “OLNI”, Kirov, Russia
Keywords: природный газ, регулятор давления, математическая модель, предотвращение гидратообразования, natural gas, pressure regulator, mathematic model, prevention of hydrate formation
Abstract
A mathematical model for reducing the pressure of natural gas in a direct acting pressure regulator is developed. It is shown that, if an output-input pressure ratio typical for practice is lower than a critical value, the pressure reduction process comes down to two stages: partial expansion of gas with throttling in the orifice plate of the pressure regulator and subsequent expansion in its casing. The values of the gas temperature in the characteristic sections of the pressure regulator are determined. It is established that the temperature drops at the first stage of pressure reduction and rises as the flow in the pressure regulator casing expands and decelerates. A method for minimizing the possibility of formation of gas hydrates in the pressure regulator is proposed.
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