Abstract
This article discusses the problems of transmission of liquefied natural gas through a non-pressure pipeline from a stationary storage facility to a transport cryogenic tank and ways to solve them. Theoretical studies have been carried out, including mathematical modeling of thermal and hydrodynamic processes during the transmission of liquefied natural gas through a pipeline by a non-pressure method.
Highlights
Nowadays, liquefied natural gas (LNG) has taken a strong position in the energy market
Transportation parameters of the LNG through a free-flow pipeline are close to the saturation line, even insignificant changes in pressure and temperature can lead to the evaporation of a part of the LNG and the appearance of a two-phase vapor-liquid flow, which significantly reduces the efficiency of LNG transfer by a free-flow method
When calculating a two-phase flow according to the model with phase slip, pressure losses in a turbulent flow regime are determined by the equation [14]: where (р/ 1)Ј0 is a pressure drop per unit length of the pipeline during the movement of the liquid phase at full flow rate G = G + G., is determined by the well-known Darcy-Weisbach equation, Pa/m; x is the mass steam content of the flow; Фј is a function expressing the ratio of the pressure loss of a two-phase mixture to the pressure loss of a single-phase liquid
Summary
Nowadays, liquefied natural gas (LNG) has taken a strong position in the energy market. One of the main reasons for this is the fact that the main consumers of natural gas were cut off from the places of its production, which necessitates the construction of liquefaction plants in places of promising fields and the transportation of LNG by sea in methane tankers [1] to [3]. The most commonly used of these are the transfer of LNG by means of pumps, pressurization of an inert gas with a lower boiling point, or pressurization of LNG vapors obtained in an evaporator [7] to [8]. There are no energy costs and the need for expensive cryogenic pumps that require maintenance, and there is no need to raise high pressure in the storage This method is widely used when unloading liquefied petroleum gases from railway tanks into storage (Fig. 1) [13]. In a certain section from the entrance to the pipeline, LNG reaches
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