Title: ЭФФЕКТИВНЫЙ МЕТОД РАСЧЕТА УТЕЧЕК ГАЗА ЧЕРЕЗ СКВОЗНЫЕ ОТВЕРСТИЯ В СТЕНКАХ ГАЗОПРОВОДОВ И СОСУДОВ ВЫСОКОГО ДАВЛЕНИЯ
Abstract: The question of calculating the volume of gas flowing from high and ultra-high pressure vessels (more than 10 MPa) through holes in their walls is considered. The main feature of the research is that the leakage is considered in a real gas model, and it has a great influence on the quantitative results. It is shown that taking into account the real properties of natural gas described by the Peng – Robinson's equation of state, for example, and above all, Joule – Thomson effect, leads to the situation when the exact gas volumes which flowing through the holes are 15–20 % higher than the values of the corresponding volumes calculated on the basis of the perfect gas model with the Mendeleev – Clapeyron equation of state. A simple and effective method is proposed for calculating parameters of the adiabatic flow of real gas, which is inside pressure vessels (including gas pipelines) from the place, which is far away from the hole, to the hole itself and further to the most compressed section of the gas stream where the local speed of sound is achieved. This method allows you to determine all parameters (pressure, temperature, density, and speed) of the gas in the most compressed section of the gas stream, to find the compressibility factor and gas flow rate. It is shown that due to the Joule – Thomson effect gas, moving towards the hole, cools much deeper than the ideal gas model suggests. In addition, the pressure, density and gas velocity in the most compressed section of the gas stream significantly differ, and therefore the leakage rate. Tables of specific (per 1 c м 2 of the hole area) flow rate of natural gas (methane) are given for a wide range of initial pressures and temperatures.
Publication Year: 2020
Publication Date: 2020-07-18
Language: en
Type: article
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